Imported from libpng-0.97.tar
This commit is contained in:
Glenn Randers-Pehrson
parent
47a0c422ca
commit
b6ce43d6ff
18
CHANGES
18
CHANGES
@ -167,3 +167,21 @@ version 0.96 [May, 1997]
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added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
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added typecasts to quiet compiler errors
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added more debugging info
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version 1.00 [not distributed, but Andreas handed off to G&G]
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skipped version 1.00 to avoid potential problems with shared libraries
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created with version 0.89
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removed PNG_USE_OWN_CRC capability
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relocated png_set_crc_action from pngrutil.c to pngrtran.c
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fixed typecasts of "new_key" etc.
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added RFC 1152 date support
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version 1.00.97 [Dec 1997]
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fixed bug in gamma handling of 4-bit grayscale
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added more typecasts. 65536L becomes (png_uint_32)65536L, etc.
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minor corrections in libpng.txt
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added simple sRGB support
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make it simpler to do conditional compiling
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fixed memory leak in pngwrite.c (free info_ptr->text)
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added more conditions for png_do_background, to avoid changing
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black pixels to background when a background is supplied and
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no pixels are transparent
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include stdio.h in pngconf.h even when PNG_NO_STDIO is defined.
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23
README
23
README
@ -1,9 +1,16 @@
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README for libpng 0.96
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README for libpng 1.10
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This is the sixth (and hopefully last) beta release of libpng 1.0.
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The changes from libpng-0.90 include bug fixes, a C++ wrapper for
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png.h, some additions to the API, as well as internal changes to
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the library. See "CHANGES" for a detailed list of differences.
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This first official release of libpng. Don't let the fact that
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it's the first release fool you. The libpng library has been in
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extensive use and testing for about two years. However, it's
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finally gotten to the stage where there haven't been significant
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changes to the API in some time, and people have a bad feeling about
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libraries with versions < 1.0.
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Note that the version number is 1.10 to avoid potential problems
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with shared libraries created for Linux ELF under version 0.89,
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which mistakenly used 1.0.89 as the library version number in
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false anticipation of an imminent 1.0 release.
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****
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Note that some of the changes to the png_info structure render this
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@ -19,6 +26,12 @@ access to info_ptr. These functions are the png_set_<chunk> and
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png_get_<chunk> functions. These functions should be used when
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accessing/storing the info_struct data, rather than manipulating it
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directly, to avoid such problems in the future.
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It is important to note that the APIs do not make current programs
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which access the info struct directly incompatible with the new
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library. However, it is strongly suggested that new programs use
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the new APIs (as shown in example.c), and older programs be converted
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to the new format, to facilitate upgrades in the future.
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****
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Additions since 0.90 include the ability to compile libpng as a
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120
example.c
120
example.c
@ -1,36 +1,36 @@
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/* example.c - an example of using libpng */
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/* This is an example of how to use libpng to read and write PNG files.
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The file libpng.txt is much more verbose then this. If you have not
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read it, do so first. This was designed to be a starting point of an
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implementation. This is not officially part of libpng, and therefore
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does not require a copyright notice.
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This file does not currently compile, because it is missing certain
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parts, like allocating memory to hold an image. You will have to
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supply these parts to get it to compile. For an example of a minimal
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working PNG reader/writer, see pngtest.c, included in this distribution.
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*/
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* The file libpng.txt is much more verbose then this. If you have not
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* read it, do so first. This was designed to be a starting point of an
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* implementation. This is not officially part of libpng, and therefore
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* does not require a copyright notice.
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*
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* This file does not currently compile, because it is missing certain
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* parts, like allocating memory to hold an image. You will have to
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* supply these parts to get it to compile. For an example of a minimal
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* working PNG reader/writer, see pngtest.c, included in this distribution.
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*/
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#include <png.h>
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/* Check to see if a file is a PNG file using png_check_sig(). Returns
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non-zero if the image is a PNG, and 0 if it isn't a PNG.
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If this call is successful, and you are going to keep the file open,
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you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
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you have created the png_ptr, so that libpng knows your application
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has read that many bytes from the start of the file. Make sure you
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don't call png_set_sig_bytes() with more than 8 bytes read or give it
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an incorrect number of bytes read, or you will either have read too
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many bytes (your fault), or you are telling libpng to read the wrong
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number of magic bytes (also your fault).
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Many applications already read the first 2 or 4 bytes from the start
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of the image to determine the file type, so it would be easiest just
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to pass the bytes to png_check_sig() or even skip that if you know
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you have a PNG file, and call png_set_sig_bytes().
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*/
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* non-zero if the image is a PNG, and 0 if it isn't a PNG.
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*
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* If this call is successful, and you are going to keep the file open,
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* you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
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* you have created the png_ptr, so that libpng knows your application
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* has read that many bytes from the start of the file. Make sure you
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* don't call png_set_sig_bytes() with more than 8 bytes read or give it
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* an incorrect number of bytes read, or you will either have read too
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* many bytes (your fault), or you are telling libpng to read the wrong
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* number of magic bytes (also your fault).
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*
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* Many applications already read the first 2 or 4 bytes from the start
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* of the image to determine the file type, so it would be easiest just
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* to pass the bytes to png_check_sig() or even skip that if you know
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* you have a PNG file, and call png_set_sig_bytes().
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*/
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#define PNG_BYTES_TO_CHECK 4
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int check_if_png(char *file_name, FILE **fp)
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{
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@ -49,10 +49,11 @@ int check_if_png(char *file_name, FILE **fp)
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}
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/* Read a PNG file. You may want to return an error code if the read
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fails (depending upon the failure). There are two "prototypes" given
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here - one where we are given the filename, and we need to open the
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file, and the other where we are given an open file (possibly with
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some or all of the magic bytes read - see comments above). */
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* fails (depending upon the failure). There are two "prototypes" given
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* here - one where we are given the filename, and we need to open the
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* file, and the other where we are given an open file (possibly with
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* some or all of the magic bytes read - see comments above).
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*/
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**** prototype 1 ****
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void read_png(char *file_name) /* We need to open the file */
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{
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@ -118,7 +119,8 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
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**** PNG file I/O method 2 ****
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/* If you are using replacement read functions, instead of calling
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* png_init_io() here you would call */
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* png_init_io() here you would call:
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*/
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png_set_read_fn(png_ptr, (void *)user_io_ptr, user_read_fn);
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/* where user_io_ptr is a structure you want available to the callbacks */
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**** Use only one I/O method! ****
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@ -143,29 +145,31 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
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/* tell libpng to strip 16 bit/color files down to 8 bits/color */
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png_set_strip_16(png_ptr);
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/* strip alpha bytes from the input data without combining with th
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* background (not recommended) */
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/* Strip alpha bytes from the input data without combining with th
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* background (not recommended).
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*/
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png_set_strip_alpha(png_ptr);
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/* extract multiple pixels with bit depths of 1, 2, and 4 from a single
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/* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
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* byte into separate bytes (useful for paletted and grayscale images).
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*/
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png_set_packing(png_ptr);
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/* change the order of packed pixels to least significant bit first
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/* Change the order of packed pixels to least significant bit first
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* (not useful if you are using png_set_packing). */
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png_set_packswap(png_ptr);
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/* expand paletted colors into true RGB triplets */
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/* Expand paletted colors into true RGB triplets */
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_expand(png_ptr);
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/* expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
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/* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
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if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
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png_set_expand(png_ptr);
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/* expand paletted or RGB images with transparency to full alpha channels
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* so the data will be available as RGBA quartets */
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/* Expand paletted or RGB images with transparency to full alpha channels
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* so the data will be available as RGBA quartets.
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*/
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if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
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png_set_expand(png_ptr);
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@ -207,13 +211,17 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
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* by the user at run time by the user. It is strongly suggested that
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* your application support gamma correction.
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*/
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if (png_get_gAMA(png_ptr, info_ptr, &image_gamma);
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png_set_gamma(png_ptr, screen_gamma, image_gamma);
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else
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png_set_gamma(png_ptr, screen_gamma, 0.45);
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if (png_get_sRGB(png_ptr, info_ptr, &srgb_intent)
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png_set_sRGB(png_ptr, srgb_intent, 0);
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else
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if (png_get_gAMA(png_ptr, info_ptr, &image_gamma)
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png_set_gamma(png_ptr, screen_gamma, image_gamma);
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else
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png_set_gamma(png_ptr, screen_gamma, 0.45);
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/* Dither RGB files down to 8 bit palette or reduce palettes
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to the number of colors available on your screen */
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* to the number of colors available on your screen.
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*/
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if (color_type & PNG_COLOR_MASK_COLOR)
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{
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png_uint_32 num_palette;
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@ -269,19 +277,19 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
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/* Turn on interlace handling. REQUIRED if you are not using
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* png_read_image(). To see how to handle interlacing passes,
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* see the png_read_row() method below.
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* see the png_read_row() method below:
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*/
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number_passes = png_set_interlace_handling(png_ptr);
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/* optional call to gamma correct and add the background to the palette
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/* Optional call to gamma correct and add the background to the palette
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* and update info structure. REQUIRED if you are expecting libpng to
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* update the palette for you (ie you selected such a transform above).
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*/
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png_read_update_info(png_ptr, info_ptr);
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/* allocate the memory to hold the image using the fields of info_ptr. */
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/* Allocate the memory to hold the image using the fields of info_ptr. */
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/* the easiest way to read the image */
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/* The easiest way to read the image: */
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png_bytep row_pointers[height];
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for (row = 0; row < height; row++)
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@ -294,7 +302,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
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png_read_image(png_ptr, row_pointers);
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**** Read the image one or more scanlines at a time ****
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/* the other way to read images - deal with interlacing */
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/* The other way to read images - deal with interlacing: */
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for (pass = 0; pass < number_passes; pass++)
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{
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@ -552,7 +560,8 @@ void write_png(char *file_name, ... other image information ...)
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/* Optional gamma chunk is strongly suggested if you have any guess
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* as to the correct gamma of the image. */
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* as to the correct gamma of the image.
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*/
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png_set_gAMA(png_ptr, info_ptr, gamma);
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/* Optionally write comments into the image */
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@ -568,6 +577,8 @@ void write_png(char *file_name, ... other image information ...)
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png_set_text(png_ptr, info_ptr, text_ptr, 2);
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/* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
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/* note that if sRGB is present the cHRM chunk must be ignored
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* on read and must be written in accordance with the sRGB profile */
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/* Write the file header information. REQUIRED */
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png_write_info(png_ptr, info_ptr);
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@ -579,13 +590,15 @@ void write_png(char *file_name, ... other image information ...)
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*/
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/* set up the transformations you want. Note that these are
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* all optional. Only call them if you want them. */
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* all optional. Only call them if you want them.
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*/
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/* invert monocrome pixels */
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png_set_invert(png_ptr);
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/* Shift the pixels up to a legal bit depth and fill in
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* as appropriate to correctly scale the image */
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* as appropriate to correctly scale the image.
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*/
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png_set_shift(png_ptr, &sig_bit);
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/* pack pixels into bytes */
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@ -595,7 +608,8 @@ void write_png(char *file_name, ... other image information ...)
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png_set_swap_alpha(png_ptr);
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/* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
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* RGB (4 channels -> 3 channels). The second parameter is not used. */
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* RGB (4 channels -> 3 channels). The second parameter is not used.
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*/
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png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
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/* flip BGR pixels to RGB */
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51
libpng.txt
51
libpng.txt
@ -1,10 +1,13 @@
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libpng.txt - a description on how to use and modify libpng
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libpng 1.0 beta 5 - version 0.95
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libpng version 1.00 version 0.97
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based on:
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libpng version 1.00 version 0.96
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Updated and distributed by Andreas Dilger <adilger@enel.ucalgary.ca>,
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Copyright (c) 1996, 1997 Andreas Dilger
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March 15, 1997
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based on:
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May 28, 1997
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libpng 1.0 beta 2 - version 0.88
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For conditions of distribution and use, see copyright notice in png.h
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@ -27,11 +30,18 @@ will need.
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Libpng was written as a companion to the PNG specification, as a way
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to reduce the amount of time and effort it takes to support the PNG
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file format in application programs. Most users will not have to
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modify the library significantly; advanced users may want to modify it
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more. All attempts were made to make it as complete as possible,
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while keeping the code easy to understand. Currently, this library
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only supports C. Support for other languages is being considered.
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file format in application programs. The PNG specification is available
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as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
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W3C Recommendation <http://www.w3.org/pub/WWW/TR/REC.png.html>. Some
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additional chunks are described in the special-purpose public chunks
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documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information
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about PNG can be found at the PNG home page, <http://www.cdrom.com/pub/png/>.
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Most users will not have to modify the library significantly; advanced
|
||||
users may want to modify it more. All attempts were made to make it as
|
||||
complete as possible, while keeping the code easy to understand.
|
||||
Currently, this library only supports C. Support for other languages
|
||||
is being considered.
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Libpng has been designed to handle multiple sessions at one time,
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to be easily modifiable, to be portable to the vast majority of
|
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@ -341,7 +351,7 @@ transparency information in a tRNS chunk. This is most useful on
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grayscale images with bit depths of 2 or 4 or if there is a multiple-image
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viewing application that wishes to treat all images in the same way.
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if (color_type == PNG_COLOR_TYPE_PALETTE && bit_depth < 8)
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if (color_type == PNG_COLOR_TYPE_PALETTE && bit_depth <= 8)
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png_set_expand(png_ptr);
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if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
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@ -614,7 +624,7 @@ The first pass will return an image 1/8 as wide as the entire image
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(every 8th column starting in column 0) and 1/8 as high as the original
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(every 8th row starting in row 0), the second will be 1/8 as wide
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(starting in column 4) and 1/8 as high (also starting in row 0). The
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third pass will be 1/4 as wide (every 4th pixel starting in row 0) and
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third pass will be 1/4 as wide (every 4th pixel starting in column 0) and
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1/8 as high (every 8th row starting in row 4), and the fourth pass will
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be 1/4 as wide and 1/4 as high (every 4th column starting in column 2,
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and every 4th row starting in row 0). The fifth pass will return an
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@ -1013,7 +1023,8 @@ The keywords that are given in the PNG Specification are:
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Author Name of image's creator
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Description Description of image (possibly long)
|
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Copyright Copyright notice
|
||||
Creation Time Time of original image creation
|
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Creation Time Time of original image creation (usually
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RFC 1123 format, see below)
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||||
Software Software used to create the image
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Disclaimer Legal disclaimer
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||||
Warning Warning of nature of content
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@ -1050,6 +1061,20 @@ instead of your local time. Note that the year number is the full
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year (ie 1996, rather than 96 - PNG is year 2000 compliant!), and
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||||
that months start with 1.
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||||
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||||
If you want to store the time of the original image creation, you should
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use a plain tEXt chunk with the "Creation Time" keyword. This is
|
||||
necessary because the "creation time" of a PNG image is somewhat vague,
|
||||
depending on whether you mean the PNG file, the time the image was
|
||||
created in a non-PNG format, a still photo from which the image was
|
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scanned, or possibly the subject matter itself. In order to facilitate
|
||||
machine-readable dates, it is recommended that the "Creation Time"
|
||||
tEXt chunk use RFC 1123 format dates (eg 22 May 1997 18:07:10 GMT"),
|
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although this isn't a requirement. Unlike the tIME chunk, the
|
||||
"Creation Time" tEXt chunk is not expected to be automatically changed
|
||||
by the software. To facilitate the use of RFC 1123 dates, a function
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||||
png_convert_to_rfc1152(png_timep) is provided to convert from PNG
|
||||
time to an RFC 1152 format string.
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||||
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||||
You are now ready to write all the file information up to the actual
|
||||
image data. You do this with a call to png_write_info().
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||||
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||||
@ -1307,8 +1332,8 @@ default function will be used, calling fprintf() and/or longjmp() if a
|
||||
problem is encountered. The replacement error functions should have
|
||||
parameters as follows:
|
||||
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||||
void user_error_fn(png_struct png_ptr, png_const_charp error_msg);
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||||
void user_warning_fn(png_struct png_ptr, png_const_charp warning_msg);
|
||||
void user_error_fn(png_structp png_ptr, png_const_charp error_msg);
|
||||
void user_warning_fn(png_structp png_ptr, png_const_charp warning_msg);
|
||||
|
||||
The motivation behind using setjmp() and longjmp() is the C++ throw and
|
||||
catch exception handling methods. This makes the code much easier to write,
|
||||
|
||||
68
makefile.dec
Normal file
68
makefile.dec
Normal file
@ -0,0 +1,68 @@
|
||||
# makefile for libpng on DEC Alpha Unix
|
||||
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
|
||||
# For conditions of distribution and use, see copyright notice in png.h
|
||||
|
||||
# Where the zlib library and include files are located
|
||||
#ZLIBLIB=/usr/local/lib
|
||||
#ZLIBINC=/usr/local/include
|
||||
ZLIBLIB=../zlib
|
||||
ZLIBINC=../zlib
|
||||
|
||||
CC=cc
|
||||
CFLAGS=-std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
|
||||
LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
|
||||
|
||||
#RANLIB=echo
|
||||
RANLIB=ranlib
|
||||
|
||||
# where make install puts libpng.a and png.h
|
||||
prefix=/usr/local
|
||||
|
||||
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
|
||||
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
|
||||
pngwtran.o pngmem.o pngerror.o pngpread.o
|
||||
|
||||
all: libpng.a pngtest
|
||||
|
||||
libpng.a: $(OBJS)
|
||||
ar rc $@ $(OBJS)
|
||||
$(RANLIB) $@
|
||||
|
||||
pngtest: pngtest.o libpng.a
|
||||
$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
|
||||
|
||||
test: pngtest
|
||||
./pngtest
|
||||
|
||||
install: libpng.a
|
||||
-@mkdir $(prefix)/include
|
||||
-@mkdir $(prefix)/lib
|
||||
cp png.h $(prefix)/include
|
||||
cp pngconf.h $(prefix)/include
|
||||
chmod 644 $(prefix)/include/png.h
|
||||
chmod 644 $(prefix)/include/pngconf.h
|
||||
cp libpng.a $(prefix)/lib
|
||||
chmod 644 $(prefix)/lib/libpng.a
|
||||
|
||||
clean:
|
||||
rm -f *.o libpng.a pngtest pngout.png
|
||||
|
||||
# DO NOT DELETE THIS LINE -- make depend depends on it.
|
||||
|
||||
png.o: png.h pngconf.h
|
||||
pngerror.o: png.h pngconf.h
|
||||
pngrio.o: png.h pngconf.h
|
||||
pngwio.o: png.h pngconf.h
|
||||
pngmem.o: png.h pngconf.h
|
||||
pngset.o: png.h pngconf.h
|
||||
pngget.o: png.h pngconf.h
|
||||
pngread.o: png.h pngconf.h
|
||||
pngrtran.o: png.h pngconf.h
|
||||
pngrutil.o: png.h pngconf.h
|
||||
pngtest.o: png.h pngconf.h
|
||||
pngtrans.o: png.h pngconf.h
|
||||
pngwrite.o: png.h pngconf.h
|
||||
pngwtran.o: png.h pngconf.h
|
||||
pngwutil.o: png.h pngconf.h
|
||||
pngpread.o: png.h pngconf.h
|
||||
|
||||
10
makefile.elf
10
makefile.elf
@ -13,14 +13,14 @@ ZLIBINC=../zlib
|
||||
WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
|
||||
-Wmissing-declarations -Wtraditional -Wcast-align \
|
||||
-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
|
||||
CFLAGS=-I$(ZLIBINC) -Wall -O2 -fPIC # $(WARNMORE) # -g -DPNG_DEBUG=3
|
||||
CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops -malign-loops=2 -malign-functions=2 -fPIC #$(WARNMORE) -g -DPNG_DEBUG=5
|
||||
LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
|
||||
|
||||
RANLIB=ranlib
|
||||
#RANLIB=echo
|
||||
|
||||
PNGMAJ = 0
|
||||
PNGMIN = 96
|
||||
PNGMAJ = 1
|
||||
PNGMIN = 1.0
|
||||
PNGVER = $(PNGMAJ).$(PNGMIN)
|
||||
|
||||
# where make install puts libpng.a, libpng.so*, and png.h
|
||||
@ -45,10 +45,10 @@ libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
|
||||
ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
|
||||
|
||||
libpng.so.$(PNGVER): $(OBJS)
|
||||
gcc -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) $(OBJS)
|
||||
gcc -shared -Wl,-soname,libpng.so.$(PNGMAJ) $(OBJS) -o libpng.so.$(PNGVER)
|
||||
|
||||
pngtest: pngtest.o libpng.so
|
||||
$(CC) -o pngtest pngtest.o $(LDFLAGS)
|
||||
$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
|
||||
|
||||
test: pngtest
|
||||
./pngtest
|
||||
|
||||
154
png.c
154
png.c
@ -1,27 +1,29 @@
|
||||
|
||||
/* png.c - location for general purpose png functions
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
/* png.c - location for general purpose libpng functions
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#define PNG_NO_EXTERN
|
||||
#include "png.h"
|
||||
|
||||
/* Version information for C files. This had better match the version
|
||||
string defined in png.h */
|
||||
char png_libpng_ver[] = "0.95";
|
||||
* string defined in png.h.
|
||||
*/
|
||||
char png_libpng_ver[] = "1.00.97";
|
||||
|
||||
/* Place to hold the signiture string for a PNG file. */
|
||||
png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
|
||||
|
||||
/* constant strings for known chunk types. If you need to add a chunk,
|
||||
add a string holding the name here. If you want to make the code
|
||||
portable to EBCDIC machines, use ASCII numbers, not characters. */
|
||||
/* Constant strings for known chunk types. If you need to add a chunk,
|
||||
* add a string holding the name here. If you want to make the code
|
||||
* portable to EBCDIC machines, use ASCII numbers, not characters.
|
||||
*/
|
||||
png_byte FARDATA png_IHDR[5] = { 73, 72, 68, 82, '\0'};
|
||||
png_byte FARDATA png_IDAT[5] = { 73, 68, 65, 84, '\0'};
|
||||
png_byte FARDATA png_IEND[5] = { 73, 69, 78, 68, '\0'};
|
||||
@ -34,6 +36,7 @@ png_byte FARDATA png_oFFs[5] = {111, 70, 70, 115, '\0'};
|
||||
png_byte FARDATA png_pCAL[5] = {112, 67, 65, 76, '\0'};
|
||||
png_byte FARDATA png_pHYs[5] = {112, 72, 89, 115, '\0'};
|
||||
png_byte FARDATA png_sBIT[5] = {115, 66, 73, 84, '\0'};
|
||||
png_byte FARDATA png_sRGB[5] = {115, 82, 71, 66, '\0'};
|
||||
png_byte FARDATA png_tEXt[5] = {116, 69, 88, 116, '\0'};
|
||||
png_byte FARDATA png_tIME[5] = {116, 73, 77, 69, '\0'};
|
||||
png_byte FARDATA png_tRNS[5] = {116, 82, 78, 83, '\0'};
|
||||
@ -53,22 +56,20 @@ int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
|
||||
/* offset to next interlace block in the y direction */
|
||||
int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
|
||||
|
||||
/* width of interlace block */
|
||||
/* this is not currently used - if you need it, uncomment it here and
|
||||
in png.h
|
||||
/* Width of interlace block. This is not currently used - if you need
|
||||
* it, uncomment it here and in png.h
|
||||
int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
|
||||
*/
|
||||
|
||||
/* height of interlace block */
|
||||
/* this is not currently used - if you need it, uncomment it here and
|
||||
in png.h
|
||||
/* Height of interlace block. This is not currently used - if you need
|
||||
* it, uncomment it here and in png.h
|
||||
int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
|
||||
*/
|
||||
|
||||
/* mask to determine which pixels are valid in a pass */
|
||||
/* Mask to determine which pixels are valid in a pass */
|
||||
int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
|
||||
|
||||
/* mask to determine which pixels to overwrite while displaying */
|
||||
/* Mask to determine which pixels to overwrite while displaying */
|
||||
int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
|
||||
|
||||
|
||||
@ -113,8 +114,9 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
|
||||
}
|
||||
|
||||
/* (Obsolete) function to check signature bytes. It does not allow one
|
||||
to check a partial signature. This function will be removed in the
|
||||
future - use png_sig_cmp(). */
|
||||
* to check a partial signature. This function will be removed in the
|
||||
* future - use png_sig_cmp().
|
||||
*/
|
||||
int
|
||||
png_check_sig(png_bytep sig, int num)
|
||||
{
|
||||
@ -151,78 +153,19 @@ png_zfree(voidpf png_ptr, voidpf ptr)
|
||||
}
|
||||
|
||||
/* Reset the CRC variable to 32 bits of 1's. Care must be taken
|
||||
in case CRC is > 32 bits to leave the top bits 0. */
|
||||
* in case CRC is > 32 bits to leave the top bits 0.
|
||||
*/
|
||||
void
|
||||
png_reset_crc(png_structp png_ptr)
|
||||
{
|
||||
/* set CRC to all 1's */
|
||||
#ifdef PNG_USE_OWN_CRC
|
||||
png_ptr->crc = 0xffffffffL;
|
||||
#else
|
||||
png_ptr->crc = crc32(0, Z_NULL, 0);
|
||||
#endif
|
||||
}
|
||||
|
||||
#ifdef PNG_USE_OWN_CRC
|
||||
/* Table of CRCs of all 8-bit messages. By default, we use the tables made
|
||||
by zlib, to save some memory. If you wish to png_malloc() this
|
||||
table, turn this into a pointer, and png_malloc() it in make_crc_table().
|
||||
You may then want to hook it into png_struct and free it with the
|
||||
destroy functions. Another alternative is to pre-fill the table. */
|
||||
static png_uint_32 crc_table[256];
|
||||
|
||||
/* Flag: has the table been computed? Initially false. */
|
||||
static int crc_table_computed = 0;
|
||||
|
||||
/* make the table for a fast crc */
|
||||
static void
|
||||
make_crc_table(void)
|
||||
{
|
||||
png_uint_32 c;
|
||||
int n, k;
|
||||
|
||||
for (n = 0; n < 256; n++)
|
||||
{
|
||||
c = (png_uint_32)n;
|
||||
for (k = 0; k < 8; k++)
|
||||
c = c & 1 ? 0xedb88320L ^ (c >> 1) : c >> 1;
|
||||
crc_table[n] = c;
|
||||
}
|
||||
crc_table_computed = 1;
|
||||
}
|
||||
|
||||
/* Update a running CRC with the bytes buf[0..len-1] - the CRC should be
|
||||
initialized to all 1's, and the transmitted value is the 1's complement
|
||||
of the final running CRC. */
|
||||
static png_uint_32
|
||||
update_crc(png_uint_32 crc, png_bytep buf, png_size_t len)
|
||||
{
|
||||
png_uint_32 c;
|
||||
png_bytep p;
|
||||
png_uint_32 n;
|
||||
|
||||
c = crc;
|
||||
p = buf;
|
||||
n = len;
|
||||
|
||||
if (!crc_table_computed)
|
||||
{
|
||||
make_crc_table();
|
||||
}
|
||||
|
||||
if (n > 0) do
|
||||
{
|
||||
c = crc_table[(png_byte)((c ^ (*p++)) & 0xff)] ^ (c >> 8);
|
||||
} while (--n);
|
||||
|
||||
return c;
|
||||
}
|
||||
#endif /* PNG_USE_OWN_CRC */
|
||||
|
||||
/* Calculate the CRC over a section of data. We can only pass as
|
||||
much data to this routine as the largest single buffer size. We
|
||||
also check that this data will actually be used before going to the
|
||||
trouble of calculating it. */
|
||||
* much data to this routine as the largest single buffer size. We
|
||||
* also check that this data will actually be used before going to the
|
||||
* trouble of calculating it.
|
||||
*/
|
||||
void
|
||||
png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
|
||||
{
|
||||
@ -241,18 +184,15 @@ png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
|
||||
}
|
||||
|
||||
if (need_crc)
|
||||
#ifdef PNG_USE_OWN_CRC
|
||||
png_ptr->crc = update_crc(png_ptr->crc, ptr, length);
|
||||
#else
|
||||
png_ptr->crc = crc32(png_ptr->crc, ptr, length);
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Allocate the memory for an info_struct for the application. We don't
|
||||
really need the png_ptr, but it could potentially be useful in the
|
||||
future. This should be used in favour of malloc(sizeof(png_info))
|
||||
and png_info_init() so that applications that want to use a shared
|
||||
libpng don't have to be recompiled if png_info changes size. */
|
||||
* really need the png_ptr, but it could potentially be useful in the
|
||||
* future. This should be used in favour of malloc(sizeof(png_info))
|
||||
* and png_info_init() so that applications that want to use a shared
|
||||
* libpng don't have to be recompiled if png_info changes size.
|
||||
*/
|
||||
png_infop
|
||||
png_create_info_struct(png_structp png_ptr)
|
||||
{
|
||||
@ -268,9 +208,10 @@ png_create_info_struct(png_structp png_ptr)
|
||||
}
|
||||
|
||||
/* This function frees the memory associated with a single info struct.
|
||||
Normally, one would use either png_destroy_read_struct() or
|
||||
png_destroy_write_struct() to free an info struct, but this may be
|
||||
useful for some applications. */
|
||||
* Normally, one would use either png_destroy_read_struct() or
|
||||
* png_destroy_write_struct() to free an info struct, but this may be
|
||||
* useful for some applications.
|
||||
*/
|
||||
void
|
||||
png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
|
||||
{
|
||||
@ -290,8 +231,9 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
|
||||
}
|
||||
|
||||
/* Initialize the info structure. This is now an internal function (0.89)
|
||||
and applications using it are urged to use png_create_info_struct()
|
||||
instead. */
|
||||
* and applications using it are urged to use png_create_info_struct()
|
||||
* instead.
|
||||
*/
|
||||
void
|
||||
png_info_init(png_infop info_ptr)
|
||||
{
|
||||
@ -337,8 +279,9 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
|
||||
}
|
||||
|
||||
/* This function returns a pointer to the io_ptr associated with the user
|
||||
functions. The application should free any memory associated with this
|
||||
pointer before png_write_destroy() or png_read_destroy() are called. */
|
||||
* functions. The application should free any memory associated with this
|
||||
* pointer before png_write_destroy() or png_read_destroy() are called.
|
||||
*/
|
||||
png_voidp
|
||||
png_get_io_ptr(png_structp png_ptr)
|
||||
{
|
||||
@ -347,8 +290,9 @@ png_get_io_ptr(png_structp png_ptr)
|
||||
|
||||
#if !defined(PNG_NO_STDIO)
|
||||
/* Initialize the default input/output functions for the PNG file. If you
|
||||
use your own read or write routines, you can call either png_set_read_fn()
|
||||
or png_set_write_fn() instead of png_init_io(). */
|
||||
* use your own read or write routines, you can call either png_set_read_fn()
|
||||
* or png_set_write_fn() instead of png_init_io().
|
||||
*/
|
||||
void
|
||||
png_init_io(png_structp png_ptr, FILE *fp)
|
||||
{
|
||||
|
||||
238
png.h
238
png.h
@ -1,67 +1,71 @@
|
||||
|
||||
/* png.h - header file for PNG reference library
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
|
||||
BETA NOTICE:
|
||||
This is a beta version. It reads and writes valid files on the
|
||||
platforms I have, and has had a wide testing program. You may
|
||||
have to modify the includes below to get it to work on your
|
||||
system, and you may have to supply the correct compiler flags in
|
||||
the makefile if you can't find a makefile suitable for your
|
||||
operating system/compiler combination. Read libpng.txt for more
|
||||
information, including how to contact the authors if you have any
|
||||
problems, or if you want your compiler/platform to be supported in
|
||||
the next official libpng release.
|
||||
|
||||
See libpng.txt for more information.
|
||||
|
||||
Contributing Authors:
|
||||
John Bowler
|
||||
Sam Bushell
|
||||
Kevin Bracey
|
||||
Andreas Dilger
|
||||
Magnus Holmgren
|
||||
Dave Martindale
|
||||
Greg Roelofs
|
||||
Guy Eric Schalnat
|
||||
Paul Schmidt
|
||||
Tom Tanner
|
||||
Tim Wegner
|
||||
|
||||
The contributing authors would like to thank all those who helped
|
||||
with testing, bug fixes, and patience. This wouldn't have been
|
||||
possible without all of you.
|
||||
|
||||
Thanks to Frank J. T. Wojcik for helping with the documentation.
|
||||
|
||||
The PNG Reference Library is supplied "AS IS". The Contributing Authors
|
||||
and Group 42, Inc. disclaim all warranties, expressed or implied,
|
||||
including, without limitation, the warranties of merchantability and of
|
||||
fitness for any purpose. The Contributing Authors and Group 42, Inc.
|
||||
assume no liability for direct, indirect, incidental, special, exemplary,
|
||||
or consequential damages, which may result from the use of the PNG
|
||||
Reference Library, even if advised of the possibility of such damage.
|
||||
|
||||
Permission is hereby granted to use, copy, modify, and distribute this
|
||||
source code, or portions hereof, for any purpose, without fee, subject
|
||||
to the following restrictions:
|
||||
1. The origin of this source code must not be misrepresented.
|
||||
2. Altered versions must be plainly marked as such and must not be
|
||||
misrepresented as being the original source.
|
||||
3. This Copyright notice may not be removed or altered from any source or
|
||||
altered source distribution.
|
||||
|
||||
The Contributing Authors and Group 42, Inc. specifically permit, without
|
||||
fee, and encourage the use of this source code as a component to
|
||||
supporting the PNG file format in commercial products. If you use this
|
||||
source code in a product, acknowledgment is not required but would be
|
||||
appreciated.
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97 beta 7
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* Dec 31, 1997
|
||||
*
|
||||
* BETA NOTICE:
|
||||
* This is a beta version. It reads and writes valid files on the
|
||||
* platforms I have, and has had a wide testing program. You may
|
||||
* have to modify the includes below to get it to work on your
|
||||
* system, and you may have to supply the correct compiler flags in
|
||||
* the makefile if you can't find a makefile suitable for your
|
||||
* operating system/compiler combination. Read libpng.txt for more
|
||||
* information, including how to contact the authors if you have any
|
||||
* problems, or if you want your compiler/platform to be supported in
|
||||
* the next official libpng release.
|
||||
*
|
||||
* See libpng.txt for more information. The PNG specification is available
|
||||
* as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
|
||||
* and as a W3C Recommendation <http://www.w3.org/pub/WWW/TR/REC.png.html>
|
||||
*
|
||||
* Contributing Authors:
|
||||
* John Bowler
|
||||
* Sam Bushell
|
||||
* Kevin Bracey
|
||||
* Andreas Dilger
|
||||
* Magnus Holmgren
|
||||
* Tom Lane
|
||||
* Dave Martindale
|
||||
* Glenn Randers-Pehrson
|
||||
* Greg Roelofs
|
||||
* Guy Eric Schalnat
|
||||
* Paul Schmidt
|
||||
* Tom Tanner
|
||||
* Tim Wegner
|
||||
*
|
||||
* The contributing authors would like to thank all those who helped
|
||||
* with testing, bug fixes, and patience. This wouldn't have been
|
||||
* possible without all of you.
|
||||
*
|
||||
* Thanks to Frank J. T. Wojcik for helping with the documentation.
|
||||
*
|
||||
* The PNG Reference Library is supplied "AS IS". The Contributing Authors
|
||||
* and Group 42, Inc. disclaim all warranties, expressed or implied,
|
||||
* including, without limitation, the warranties of merchantability and of
|
||||
* fitness for any purpose. The Contributing Authors and Group 42, Inc.
|
||||
* assume no liability for direct, indirect, incidental, special, exemplary,
|
||||
* or consequential damages, which may result from the use of the PNG
|
||||
* Reference Library, even if advised of the possibility of such damage.
|
||||
*
|
||||
* Permission is hereby granted to use, copy, modify, and distribute this
|
||||
* source code, or portions hereof, for any purpose, without fee, subject
|
||||
* to the following restrictions:
|
||||
* 1. The origin of this source code must not be misrepresented.
|
||||
* 2. Altered versions must be plainly marked as such and must not be
|
||||
* misrepresented as being the original source.
|
||||
* 3. This Copyright notice may not be removed or altered from any source or
|
||||
* altered source distribution.
|
||||
*
|
||||
* The Contributing Authors and Group 42, Inc. specifically permit, without
|
||||
* fee, and encourage the use of this source code as a component to
|
||||
* supporting the PNG file format in commercial products. If you use this
|
||||
* source code in a product, acknowledgment is not required but would be
|
||||
* appreciated.
|
||||
*/
|
||||
|
||||
#ifndef _PNG_H
|
||||
#define _PNG_H
|
||||
@ -89,12 +93,12 @@ extern "C" {
|
||||
*/
|
||||
|
||||
/* Version information for png.h - this should match the version in png.c */
|
||||
#define PNG_LIBPNG_VER_STRING "0.96"
|
||||
#define PNG_LIBPNG_VER_STRING "1.00.97"
|
||||
|
||||
/* careful here. At one time, I wanted to use 082, but that would be octal.
|
||||
* Version 1.0 will be 100 here, etc.
|
||||
*/
|
||||
#define PNG_LIBPNG_VER 96
|
||||
#define PNG_LIBPNG_VER 97
|
||||
|
||||
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
|
||||
#ifndef PNG_NO_EXTERN
|
||||
@ -172,10 +176,11 @@ typedef png_text FAR * FAR * png_textpp;
|
||||
#define PNG_TEXT_COMPRESSION_LAST 1 /* Not a valid value */
|
||||
|
||||
/* png_time is a way to hold the time in an machine independent way.
|
||||
Two conversions are provided, both from time_t and struct tm. There
|
||||
is no portable way to convert to either of these structures, as far
|
||||
as I know. If you know of a portable way, send it to me. As a side
|
||||
note - PNG is Year 2000 compliant! */
|
||||
* Two conversions are provided, both from time_t and struct tm. There
|
||||
* is no portable way to convert to either of these structures, as far
|
||||
* as I know. If you know of a portable way, send it to me. As a side
|
||||
* note - PNG is Year 2000 compliant!
|
||||
*/
|
||||
typedef struct png_time_struct
|
||||
{
|
||||
png_uint_16 year; /* full year, as in, 1995 */
|
||||
@ -244,6 +249,13 @@ typedef struct png_info_struct
|
||||
*/
|
||||
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
|
||||
#endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
|
||||
/* GR-P, 0.96a */
|
||||
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
|
||||
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
|
||||
defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
|
||||
/* The tEXt and zTXt chunks contain human-readable textual data in
|
||||
@ -422,6 +434,7 @@ typedef png_info FAR * FAR * png_infopp;
|
||||
#define PNG_INFO_oFFs 0x0100
|
||||
#define PNG_INFO_tIME 0x0200
|
||||
#define PNG_INFO_pCAL 0x0400
|
||||
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
|
||||
|
||||
/* This is used for the transformation routines, as some of them
|
||||
* change these values for the row. It also should enable using
|
||||
@ -524,7 +537,6 @@ struct png_struct_def
|
||||
png_byte usr_channels; /* channels at start of write */
|
||||
png_byte sig_bytes; /* magic bytes read/written from start of file */
|
||||
|
||||
|
||||
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
||||
png_byte filler; /* filler byte for 24->32-bit pixel expansion */
|
||||
#endif /* PNG_READ_FILLER_SUPPORTED */
|
||||
@ -609,6 +621,9 @@ struct png_struct_def
|
||||
png_uint_16p filter_costs; /* relative filter calculation cost */
|
||||
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
|
||||
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
||||
#if defined(PNG_TIME_RFC1152_SUPPORTED)
|
||||
png_charp time_buffer; /* String to hold RFC 1152 time text */
|
||||
#endif /* PNG_TIME_RFC1152_SUPPORTED */
|
||||
};
|
||||
|
||||
typedef png_struct FAR * FAR * png_structpp;
|
||||
@ -640,8 +655,8 @@ extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
|
||||
|
||||
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
|
||||
extern PNG_EXPORT(png_structp,png_create_read_struct)
|
||||
PNGARG((png_charp user_png_ver, voidp error_ptr, png_error_ptr error_fn,
|
||||
png_error_ptr warn_fn));
|
||||
PNGARG((png_const_charp user_png_ver, voidp error_ptr,
|
||||
png_error_ptr error_fn, png_error_ptr warn_fn));
|
||||
|
||||
/* Allocate and initialize png_ptr struct for reading, and any other memory */
|
||||
extern PNG_EXPORT(png_structp,png_create_write_struct)
|
||||
@ -663,6 +678,11 @@ extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
|
||||
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
|
||||
png_infop info_ptr));
|
||||
|
||||
#if defined(PNG_TIME_RFC1152_SUPPORTED)
|
||||
extern PNG_EXPORT(png_charp,png_convert_to_rfc1152)
|
||||
PNGARG((png_structp png_ptr, png_timep ptime));
|
||||
#endif /* PNG_TIME_RFC1152_SUPPORTED */
|
||||
|
||||
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
||||
/* convert from a struct tm to png_time */
|
||||
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
|
||||
@ -840,6 +860,9 @@ extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
|
||||
extern PNG_EXPORT(void,png_destroy_write_struct)
|
||||
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
|
||||
|
||||
/* free any memory used in info_ptr struct (old method - NOT DLL EXPORTED) */
|
||||
extern void png_write_destroy_info PNGARG((png_infop info_ptr));
|
||||
|
||||
/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
|
||||
extern void png_write_destroy PNGARG((png_structp png_ptr));
|
||||
|
||||
@ -868,10 +891,12 @@ extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
|
||||
* mainly useful for testing, as the defaults should work with most users.
|
||||
* Those users who are tight on memory or want faster performance at the
|
||||
* expense of compression can modify them. See the compression library
|
||||
* header file (zlib.h) for an explination of the compression functions. */
|
||||
* header file (zlib.h) for an explination of the compression functions.
|
||||
*/
|
||||
|
||||
/* set the filtering method(s) used by libpng. Currently, the only valid
|
||||
* value for "method" is 0 */
|
||||
* value for "method" is 0.
|
||||
*/
|
||||
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
|
||||
int filters));
|
||||
|
||||
@ -1030,7 +1055,7 @@ extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
|
||||
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
|
||||
png_uint_32 size));
|
||||
|
||||
/* free's a pointer allocated by png_malloc() */
|
||||
/* frees a pointer allocated by png_malloc() */
|
||||
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
|
||||
|
||||
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
|
||||
@ -1175,6 +1200,18 @@ extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
|
||||
png_infop info_ptr, png_color_8p sig_bit));
|
||||
#endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
|
||||
png_infop info_ptr, png_byte *srgb_intent));
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
|
||||
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
|
||||
png_infop info_ptr, png_byte srgb_intent));
|
||||
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
|
||||
png_infop info_ptr, png_byte srgb_intent));
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
|
||||
/* png_get_text also returns the number of text chunks in text_ptr */
|
||||
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
|
||||
@ -1244,13 +1281,17 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
|
||||
#if defined(PNG_INTERNAL)
|
||||
|
||||
/* Various modes of operation. Note that after an init, mode is set to
|
||||
zero automatically when the structure is created. */
|
||||
* zero automatically when the structure is created.
|
||||
*/
|
||||
#define PNG_BEFORE_IHDR 0x00
|
||||
#define PNG_HAVE_IHDR 0x01
|
||||
#define PNG_HAVE_PLTE 0x02
|
||||
#define PNG_HAVE_IDAT 0x04
|
||||
#define PNG_AFTER_IDAT 0x08
|
||||
#define PNG_HAVE_IEND 0x10
|
||||
#define PNG_HAVE_gAMA 0x20
|
||||
#define PNG_HAVE_cHRM 0x40
|
||||
#define PNG_HAVE_sRGB 0x80
|
||||
|
||||
/* push model modes */
|
||||
#define PNG_READ_SIG_MODE 0
|
||||
@ -1331,10 +1372,11 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
|
||||
/* place to hold the signiture string for a PNG file. */
|
||||
extern png_byte FARDATA png_sig[];
|
||||
|
||||
/* constant strings for known chunk types. If you need to add a chunk,
|
||||
add a string holding the name here. See png.c for more details. We
|
||||
can't selectively include these, since we still check for chunk in the
|
||||
wrong locations with these labels. */
|
||||
/* Constant strings for known chunk types. If you need to add a chunk,
|
||||
* add a string holding the name here. See png.c for more details. We
|
||||
* can't selectively include these, since we still check for chunk in the
|
||||
* wrong locations with these labels.
|
||||
*/
|
||||
extern png_byte FARDATA png_IHDR[];
|
||||
extern png_byte FARDATA png_IDAT[];
|
||||
extern png_byte FARDATA png_IEND[];
|
||||
@ -1347,6 +1389,7 @@ extern png_byte FARDATA png_oFFs[];
|
||||
extern png_byte FARDATA png_pCAL[];
|
||||
extern png_byte FARDATA png_pHYs[];
|
||||
extern png_byte FARDATA png_sBIT[];
|
||||
extern png_byte FARDATA png_sRGB[];
|
||||
extern png_byte FARDATA png_tEXt[];
|
||||
extern png_byte FARDATA png_tIME[];
|
||||
extern png_byte FARDATA png_tRNS[];
|
||||
@ -1376,12 +1419,14 @@ PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
|
||||
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
|
||||
#endif /* PNG_BIG_ENDIAN_GET_SUPPORTED */
|
||||
|
||||
/* Initialize png_ptr struct for reading, and allocate any other memory
|
||||
* (old interface - NOT DLL EXPORTED) */
|
||||
/* Initialize png_ptr struct for reading, and allocate any other memory.
|
||||
* (old interface - NOT DLL EXPORTED).
|
||||
*/
|
||||
extern void png_read_init PNGARG((png_structp png_ptr));
|
||||
|
||||
/* Initialize png_ptr struct for writing, and allocate any other memory
|
||||
* (old interface - NOT DLL EXPORTED) */
|
||||
/* Initialize png_ptr struct for writing, and allocate any other memory.
|
||||
* (old interface - NOT DLL EXPORTED).
|
||||
*/
|
||||
extern void png_write_init PNGARG((png_structp png_ptr));
|
||||
|
||||
/* allocate memory for an internal libpng struct */
|
||||
@ -1433,7 +1478,7 @@ PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
|
||||
#endif
|
||||
|
||||
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
|
||||
* The only currently known PNG chunk that uses unsigned numbers is
|
||||
* The only currently known PNG chunk that uses signed numbers is
|
||||
* the ancillary extension chunk, pCAL.
|
||||
*/
|
||||
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
|
||||
@ -1442,8 +1487,11 @@ PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
|
||||
PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
|
||||
#endif
|
||||
|
||||
/* place a 16 bit number into a buffer in PNG byte order */
|
||||
PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, png_uint_16 i));
|
||||
/* Place a 16 bit number into a buffer in PNG byte order.
|
||||
* The parameter is declared unsigned int, not png_uint_16,
|
||||
* just to avoid potential problems on pre-ANSI C compilers.
|
||||
*/
|
||||
PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i));
|
||||
|
||||
/* Write a PNG chunk - size, type, (optional) data, CRC. */
|
||||
PNG_EXTERN void png_write_chunk PNGARG((png_structp png_ptr,
|
||||
@ -1466,7 +1514,8 @@ PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
|
||||
/* write various chunks */
|
||||
|
||||
/* Write the IHDR chunk, and update the png_struct with the necessary
|
||||
information. */
|
||||
* information.
|
||||
*/
|
||||
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
|
||||
png_uint_32 height,
|
||||
int bit_depth, int color_type, int compression_type, int filter_type,
|
||||
@ -1496,6 +1545,11 @@ PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
|
||||
double blue_x, double blue_y));
|
||||
#endif
|
||||
|
||||
#if defined(PNG_WRITE_sRGB_SUPPORTED)
|
||||
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
|
||||
png_byte srgb_intent));
|
||||
#endif
|
||||
|
||||
#if defined(PNG_WRITE_tRNS_SUPPORTED)
|
||||
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
|
||||
png_color_16p values, int number, int color_type));
|
||||
@ -1513,7 +1567,7 @@ PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
|
||||
|
||||
#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
|
||||
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
|
||||
png_charp key, png_bytepp new_key));
|
||||
png_charp key, png_charpp new_key));
|
||||
#endif
|
||||
|
||||
#if defined(PNG_WRITE_tEXt_SUPPORTED)
|
||||
@ -1698,7 +1752,8 @@ PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
|
||||
#endif
|
||||
|
||||
/* The following decodes the appropriate chunks, and does error correction,
|
||||
* then calls the appropriate callback for the chunk if it is valid */
|
||||
* then calls the appropriate callback for the chunk if it is valid.
|
||||
*/
|
||||
|
||||
/* decode the IHDR chunk */
|
||||
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
|
||||
@ -1723,6 +1778,11 @@ PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
|
||||
png_uint_32 length));
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
|
||||
png_uint_32 length));
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_tRNS_SUPPORTED)
|
||||
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
|
||||
png_uint_32 length));
|
||||
|
||||
225
pngconf.h
225
pngconf.h
@ -1,66 +1,69 @@
|
||||
|
||||
/* pngconf.c - machine configurable file for libpng
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
/* Any machine specific code is near the front of this file, so if you
|
||||
are configuring libpng for a machine, you may want to read the section
|
||||
starting here down to where it starts to typedef png_color, png_text,
|
||||
and png_info */
|
||||
* are configuring libpng for a machine, you may want to read the section
|
||||
* starting here down to where it starts to typedef png_color, png_text,
|
||||
* and png_info.
|
||||
*/
|
||||
|
||||
#ifndef PNGCONF_H
|
||||
#define PNGCONF_H
|
||||
|
||||
/* This is the size of the compression buffer, and thus the size of
|
||||
an IDAT chunk. Make this whatever size you feel is best for your
|
||||
machine. One of these will be allocated per png_struct. When this
|
||||
is full, it writes the data to the disk, and does some other
|
||||
calculations. Making this an extreamly small size will slow
|
||||
the library down, but you may want to experiment to determine
|
||||
where it becomes significant, if you are concerned with memory
|
||||
usage. Note that zlib allocates at least 32Kb also. For readers,
|
||||
this describes the size of the buffer available to read the data in.
|
||||
Unless this gets smaller then the size of a row (compressed),
|
||||
it should not make much difference how big this is. */
|
||||
* an IDAT chunk. Make this whatever size you feel is best for your
|
||||
* machine. One of these will be allocated per png_struct. When this
|
||||
* is full, it writes the data to the disk, and does some other
|
||||
* calculations. Making this an extreamly small size will slow
|
||||
* the library down, but you may want to experiment to determine
|
||||
* where it becomes significant, if you are concerned with memory
|
||||
* usage. Note that zlib allocates at least 32Kb also. For readers,
|
||||
* this describes the size of the buffer available to read the data in.
|
||||
* Unless this gets smaller then the size of a row (compressed),
|
||||
* it should not make much difference how big this is.
|
||||
*/
|
||||
|
||||
#define PNG_ZBUF_SIZE 8192
|
||||
|
||||
/* If you are running on a machine where you cannot allocate more
|
||||
than 64K of memory at once, uncomment this. While libpng will not
|
||||
normally need that much memory in a chunk (unless you load up a very
|
||||
large file), zlib needs to know how big of a chunk it can use, and
|
||||
libpng thus makes sure to check any memory allocation to verify it
|
||||
will fit into memory.
|
||||
* than 64K of memory at once, uncomment this. While libpng will not
|
||||
* normally need that much memory in a chunk (unless you load up a very
|
||||
* large file), zlib needs to know how big of a chunk it can use, and
|
||||
* libpng thus makes sure to check any memory allocation to verify it
|
||||
* will fit into memory.
|
||||
#define PNG_MAX_MALLOC_64K
|
||||
*/
|
||||
*/
|
||||
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
|
||||
#define PNG_MAX_MALLOC_64K
|
||||
#endif
|
||||
|
||||
/* This protects us against compilers which run on a windowing system
|
||||
and thus don't have or would rather us not use the stdio types:
|
||||
stdin, stdout, and stderr. The only one currently used is stderr
|
||||
in png_error() and png_warning(). #defining PNG_NO_STDIO will
|
||||
prevent these from being compiled and used. */
|
||||
* and thus don't have or would rather us not use the stdio types:
|
||||
* stdin, stdout, and stderr. The only one currently used is stderr
|
||||
* in png_error() and png_warning(). #defining PNG_NO_STDIO will
|
||||
* prevent these from being compiled and used.
|
||||
* #define PNG_NO_STDIO
|
||||
*/
|
||||
|
||||
/* #define PNG_NO_STDIO */
|
||||
/* We still need stdio.h for FILE even when PNG_NO_STDIO is defined.
|
||||
*/
|
||||
|
||||
/* for FILE. If you are not using standard io, you don't need this */
|
||||
#ifndef PNG_NO_STDIO
|
||||
#include <stdio.h>
|
||||
#endif
|
||||
|
||||
/* This macro protects us against machines that don't have function
|
||||
prototypes (ie K&R style headers). If your compiler does not handle
|
||||
function prototypes, define this macro and use the included ansi2knr.
|
||||
I've always been able to use _NO_PROTO as the indicator, but you may
|
||||
need to drag the empty declaration out in front of here, or change the
|
||||
ifdef to suit your own needs. */
|
||||
* prototypes (ie K&R style headers). If your compiler does not handle
|
||||
* function prototypes, define this macro and use the included ansi2knr.
|
||||
* I've always been able to use _NO_PROTO as the indicator, but you may
|
||||
* need to drag the empty declaration out in front of here, or change the
|
||||
* ifdef to suit your own needs.
|
||||
*/
|
||||
#ifndef PNGARG
|
||||
|
||||
#ifdef OF /* zlib prototype munger */
|
||||
@ -77,8 +80,12 @@
|
||||
|
||||
#endif /* PNGARG */
|
||||
|
||||
/* Try to determine if we are compiling on a Mac */
|
||||
#if defined(__MWERKS__) ||defined(applec) ||defined(THINK_C) ||defined(__SC__)
|
||||
/* Try to determine if we are compiling on a Mac. Note that testing for
|
||||
* just __MWERKS__ is not good enough, because the Codewarrior is now used
|
||||
* on non-Mac platforms.
|
||||
*/
|
||||
#if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
|
||||
defined(THINK_C) || defined(__SC__)
|
||||
#define MACOS
|
||||
#endif
|
||||
|
||||
@ -88,27 +95,28 @@
|
||||
#endif
|
||||
|
||||
/* This is an attempt to force a single setjmp behaviour on Linux. If
|
||||
the X config stuff didn't define _BSD_SOURCE we wouldn't need this. */
|
||||
#ifdef linux
|
||||
* the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
|
||||
*/
|
||||
#ifdef __linux__
|
||||
#ifdef _BSD_SOURCE
|
||||
#define _PNG_SAVE_BSD_SOURCE
|
||||
#undef _BSD_SOURCE
|
||||
#endif
|
||||
#ifdef _SETJMP_H
|
||||
#error __png_h_already_includes_setjmp_h__
|
||||
#error __dont_include_it_again__
|
||||
__png.h__ already includes setjmp.h
|
||||
__dont__ include it again
|
||||
#endif
|
||||
#endif /* linux */
|
||||
#endif /* __linux__ */
|
||||
|
||||
/* include setjmp.h for error handling */
|
||||
#include <setjmp.h>
|
||||
|
||||
#ifdef linux
|
||||
#ifdef __linux__
|
||||
#ifdef _PNG_SAVE_BSD_SOURCE
|
||||
#define _BSD_SOURCE
|
||||
#undef _PNG_SAVE_BSD_SOURCE
|
||||
#endif
|
||||
#endif /* linux */
|
||||
#endif /* __linux__ */
|
||||
|
||||
#ifdef BSD
|
||||
#include <strings.h>
|
||||
@ -119,9 +127,6 @@
|
||||
/* Other defines for things like memory and the like can go here. */
|
||||
#ifdef PNG_INTERNAL
|
||||
#include <stdlib.h>
|
||||
/* Where do we need this???
|
||||
#include <ctype.h>
|
||||
*/
|
||||
|
||||
/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
|
||||
* aren't usually used outside the library (as far as I know), so it is
|
||||
@ -133,12 +138,14 @@
|
||||
#define PNG_EXTERN
|
||||
|
||||
/* Other defines specific to compilers can go here. Try to keep
|
||||
them inside an appropriate ifdef/endif pair for portability */
|
||||
* them inside an appropriate ifdef/endif pair for portability.
|
||||
*/
|
||||
|
||||
#if defined(MACOS)
|
||||
/* We need to check that <math.h> hasn't already been included earlier
|
||||
as it seems it doesn't agree with <fp.h>, yet we should really use
|
||||
<fp.h> if possible. */
|
||||
* as it seems it doesn't agree with <fp.h>, yet we should really use
|
||||
* <fp.h> if possible.
|
||||
*/
|
||||
#if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
|
||||
#include <fp.h>
|
||||
#endif
|
||||
@ -147,8 +154,9 @@
|
||||
#endif
|
||||
|
||||
/* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
|
||||
stdlib.h like it should (I think). Or perhaps this is a C++
|
||||
"feature"? */
|
||||
* stdlib.h like it should (I think). Or perhaps this is a C++
|
||||
* "feature"?
|
||||
*/
|
||||
#ifdef __TURBOC__
|
||||
#include <mem.h>
|
||||
#include "alloc.h"
|
||||
@ -159,34 +167,36 @@
|
||||
#endif
|
||||
|
||||
/* This controls how fine the dithering gets. As this allocates
|
||||
a largish chunk of memory (32K), those who are not as concerned
|
||||
with dithering quality can decrease some or all of these. */
|
||||
* a largish chunk of memory (32K), those who are not as concerned
|
||||
* with dithering quality can decrease some or all of these.
|
||||
*/
|
||||
#define PNG_DITHER_RED_BITS 5
|
||||
#define PNG_DITHER_GREEN_BITS 5
|
||||
#define PNG_DITHER_BLUE_BITS 5
|
||||
|
||||
/* This controls how fine the gamma correction becomes when you
|
||||
are only interested in 8 bits anyway. Increasing this value
|
||||
results in more memory being used, and more pow() functions
|
||||
being called to fill in the gamma tables. Don't set this
|
||||
value less then 8, and even that may not work (I haven't tested
|
||||
it). */
|
||||
* are only interested in 8 bits anyway. Increasing this value
|
||||
* results in more memory being used, and more pow() functions
|
||||
* being called to fill in the gamma tables. Don't set this value
|
||||
* less then 8, and even that may not work (I haven't tested it).
|
||||
*/
|
||||
|
||||
#define PNG_MAX_GAMMA_8 11
|
||||
|
||||
/* This controls how much a difference in gamma we can tolerate before
|
||||
we actually start doing gamma conversion. */
|
||||
* we actually start doing gamma conversion.
|
||||
*/
|
||||
#define PNG_GAMMA_THRESHOLD 0.05
|
||||
|
||||
#endif /* PNG_INTERNAL */
|
||||
|
||||
/* The following uses const char * instead of char * for error
|
||||
and warning message functions, so some compilers won't complain.
|
||||
If you want to use const, define PNG_USE_CONST here. It is not
|
||||
normally defined to make configuration easier, as it is not a
|
||||
critical part of the code.
|
||||
*/
|
||||
#undef PNG_USE_CONST
|
||||
* and warning message functions, so some compilers won't complain.
|
||||
* If you want to use const, define PNG_USE_CONST here. It is not
|
||||
* normally defined to make configuration easier, as it is not a
|
||||
* critical part of the code.
|
||||
*/
|
||||
#define PNG_USE_CONST
|
||||
|
||||
#ifdef PNG_USE_CONST
|
||||
# define PNG_CONST const
|
||||
@ -195,19 +205,34 @@
|
||||
#endif
|
||||
|
||||
/* The following defines give you the ability to remove code from the
|
||||
library that you will not be using. I wish I could figure out how to
|
||||
automate this, but I can't do that without making it seriously hard
|
||||
on the users. So if you are not using an ability, change the #define
|
||||
to and #undef, and that part of the library will not be compiled. If
|
||||
your linker can't find a function, you may want to make sure the
|
||||
ability is defined here. Some of these depend upon some others being
|
||||
defined. I haven't figured out all the interactions here, so you may
|
||||
have to experiment awhile to get everything to compile. If you are
|
||||
creating or using a shared library, you probably shouldn't touch this,
|
||||
as it will affect the size of the structures, and this will cause bad
|
||||
things to happen if the library and/or application ever change. */
|
||||
* library that you will not be using. I wish I could figure out how to
|
||||
* automate this, but I can't do that without making it seriously hard
|
||||
* on the users. So if you are not using an ability, change the #define
|
||||
* to and #undef, and that part of the library will not be compiled. If
|
||||
* your linker can't find a function, you may want to make sure the
|
||||
* ability is defined here. Some of these depend upon some others being
|
||||
* defined. I haven't figured out all the interactions here, so you may
|
||||
* have to experiment awhile to get everything to compile. If you are
|
||||
* creating or using a shared library, you probably shouldn't touch this,
|
||||
* as it will affect the size of the structures, and this will cause bad
|
||||
* things to happen if the library and/or application ever change.
|
||||
*/
|
||||
|
||||
/* Any transformations you will not be using can be undef'ed here */
|
||||
|
||||
/* GR-P, 0.96a: Set "*FULLY_SUPPORTED as default but allow user
|
||||
to turn it off with "*NOT_FULLY_SUPPORTED" on the compile line,
|
||||
then pick and choose which ones to define without having to edit
|
||||
this file */
|
||||
|
||||
#ifndef PNG_READ_NOT_FULLY_SUPPORTED
|
||||
#define PNG_READ_FULLY_SUPPORTED
|
||||
#endif
|
||||
#ifndef PNG_WRITE_NOT_FULLY_SUPPORTED
|
||||
#define PNG_WRITE_FULLY_SUPPORTED
|
||||
#endif
|
||||
|
||||
#ifdef PNG_READ_FULLY_SUPPORTED
|
||||
#define PNG_PROGRESSIVE_READ_SUPPORTED
|
||||
#define PNG_READ_OPT_PLTE_SUPPORTED
|
||||
#define PNG_READ_INTERLACING_SUPPORTED
|
||||
@ -226,7 +251,9 @@
|
||||
#define PNG_READ_GRAY_TO_RGB_SUPPORTED
|
||||
#define PNG_READ_SWAP_ALPHA_SUPPORTED
|
||||
#define PNG_READ_STRIP_ALPHA_SUPPORTED
|
||||
#endif /* PNG_READ_FULLY_SUPPORTED */
|
||||
|
||||
#ifdef PNG_WRITE_FULLY_SUPPORTED
|
||||
#define PNG_WRITE_INTERLACING_SUPPORTED
|
||||
#define PNG_WRITE_SHIFT_SUPPORTED
|
||||
#define PNG_WRITE_PACK_SUPPORTED
|
||||
@ -238,6 +265,9 @@
|
||||
#define PNG_WRITE_FLUSH_SUPPORTED
|
||||
#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
|
||||
#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
|
||||
#endif /*PNG_WRITE_FULLY_SUPPORTED */
|
||||
|
||||
#define PNG_TIME_RFC1152_SUPPORTED
|
||||
|
||||
/* These are currently experimental features */
|
||||
#undef PNG_READ_16_TO_8_ACCURATE_SHIFT_SUPPORTED /* very little testing */
|
||||
@ -247,7 +277,6 @@
|
||||
#undef PNG_READ_BIG_ENDIAN_SUPPORTED /* some testing */
|
||||
|
||||
/* These functions are turned off by default, as they will be phased out. */
|
||||
#undef PNG_USE_OWN_CRC
|
||||
#undef PNG_USELESS_TESTS_SUPPORTED
|
||||
#undef PNG_CORRECT_PALETTE_SUPPORTED
|
||||
|
||||
@ -258,6 +287,7 @@
|
||||
* and RGBA images.
|
||||
*/
|
||||
|
||||
#ifdef PNG_READ_FULLY_SUPPORTED
|
||||
#define PNG_READ_bKGD_SUPPORTED
|
||||
#define PNG_READ_cHRM_SUPPORTED
|
||||
#define PNG_READ_gAMA_SUPPORTED
|
||||
@ -266,11 +296,14 @@
|
||||
#define PNG_READ_pCAL_SUPPORTED
|
||||
#define PNG_READ_pHYs_SUPPORTED
|
||||
#define PNG_READ_sBIT_SUPPORTED
|
||||
#define PNG_READ_sRGB_SUPPORTED
|
||||
#define PNG_READ_tEXt_SUPPORTED
|
||||
#define PNG_READ_tIME_SUPPORTED
|
||||
#define PNG_READ_tRNS_SUPPORTED
|
||||
#define PNG_READ_zTXt_SUPPORTED
|
||||
#endif /* PNG_READ_FULLY_SUPPORTED */
|
||||
|
||||
#ifdef PNG_WRITE_FULLY_SUPPORTED
|
||||
#define PNG_WRITE_bKGD_SUPPORTED
|
||||
#define PNG_WRITE_cHRM_SUPPORTED
|
||||
#define PNG_WRITE_gAMA_SUPPORTED
|
||||
@ -279,10 +312,12 @@
|
||||
#define PNG_WRITE_pCAL_SUPPORTED
|
||||
#define PNG_WRITE_pHYs_SUPPORTED
|
||||
#define PNG_WRITE_sBIT_SUPPORTED
|
||||
#define PNG_WRITE_sRGB_SUPPORTED
|
||||
#define PNG_WRITE_tEXt_SUPPORTED
|
||||
#define PNG_WRITE_tIME_SUPPORTED
|
||||
#define PNG_WRITE_tRNS_SUPPORTED
|
||||
#define PNG_WRITE_zTXt_SUPPORTED
|
||||
#endif /* PNG_WRITE_FULLY_SUPPORTED */
|
||||
|
||||
/* need the time information for reading tIME chunks */
|
||||
#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
|
||||
@ -336,18 +371,19 @@ typedef size_t png_size_t;
|
||||
#endif /* LDATA != 1 */
|
||||
|
||||
/* Possibly useful for moving data out of default segment.
|
||||
Uncomment it if you want. Could also define FARDATA as
|
||||
const if your compiler supports it. (SJT)
|
||||
* Uncomment it if you want. Could also define FARDATA as
|
||||
* const if your compiler supports it. (SJT)
|
||||
# define FARDATA FAR
|
||||
*/
|
||||
*/
|
||||
#endif /* __WIN32__, __FLAT__ */
|
||||
|
||||
#endif /* __BORLANDC__ */
|
||||
|
||||
|
||||
/* Suggest testing for specific compiler first before testing for
|
||||
FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM,
|
||||
making reliance oncertain keywords suspect. (SJT) */
|
||||
* FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM,
|
||||
* making reliance oncertain keywords suspect. (SJT)
|
||||
*/
|
||||
|
||||
/* MSC Medium model */
|
||||
#if defined(FAR)
|
||||
@ -400,18 +436,29 @@ typedef charf * png_zcharp;
|
||||
typedef charf * FAR * png_zcharpp;
|
||||
typedef z_stream FAR * png_zstreamp;
|
||||
|
||||
/* allow for compilation as dll under windows */
|
||||
/* allow for compilation as dll under MS Windows */
|
||||
#ifdef __WIN32DLL__
|
||||
#define PNG_EXPORT(type,symbol) __declspec(dllexport) type symbol
|
||||
#endif
|
||||
|
||||
/* allow for compilation as dll with BORLAND C++ 5.0 */
|
||||
#if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__)
|
||||
# define PNG_EXPORT(t,s) t _export s
|
||||
#endif
|
||||
|
||||
/* allow for compilation as shared lib under BeOS */
|
||||
#ifdef __BEOSDLL__
|
||||
#define PNG_EXPORT(type,symbol) __declspec(export) type symbol
|
||||
#endif
|
||||
|
||||
#ifndef PNG_EXPORT
|
||||
#define PNG_EXPORT(t,s) t s
|
||||
#endif
|
||||
|
||||
|
||||
/* User may want to use these so not in PNG_INTERNAL. Any library functions
|
||||
that are passed far data must be model independent. */
|
||||
* that are passed far data must be model independent.
|
||||
*/
|
||||
|
||||
#if defined(USE_FAR_KEYWORD) /* memory model independent fns */
|
||||
/* use this to make far-to-near assignments */
|
||||
|
||||
63
pngerror.c
63
pngerror.c
@ -1,16 +1,17 @@
|
||||
|
||||
/* pngerror.c - stub functions for i/o and memory allocation
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
|
||||
This file provides a location for all error handling. Users which
|
||||
need special error handling are expected to write replacement functions
|
||||
and use png_set_error_fn() to use those functions. See the instructions
|
||||
at each function. */
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This file provides a location for all error handling. Users which
|
||||
* need special error handling are expected to write replacement functions
|
||||
* and use png_set_error_fn() to use those functions. See the instructions
|
||||
* at each function.
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
@ -21,9 +22,10 @@ static void png_default_warning PNGARG((png_structp png_ptr,
|
||||
png_const_charp message));
|
||||
|
||||
/* This function is called whenever there is a fatal error. This function
|
||||
should not be changed. If there is a need to handle errors differently,
|
||||
you should supply a replacement error function and use png_set_error_fn()
|
||||
to replace the error function at run-time. */
|
||||
* should not be changed. If there is a need to handle errors differently,
|
||||
* you should supply a replacement error function and use png_set_error_fn()
|
||||
* to replace the error function at run-time.
|
||||
*/
|
||||
void
|
||||
png_error(png_structp png_ptr, png_const_charp message)
|
||||
{
|
||||
@ -36,9 +38,10 @@ png_error(png_structp png_ptr, png_const_charp message)
|
||||
}
|
||||
|
||||
/* This function is called whenever there is a non-fatal error. This function
|
||||
should not be changed. If there is a need to handle warnings differently,
|
||||
you should supply a replacement warning function and use
|
||||
png_set_error_fn() to replace the warning function at run-time. */
|
||||
* should not be changed. If there is a need to handle warnings differently,
|
||||
* you should supply a replacement warning function and use
|
||||
* png_set_error_fn() to replace the warning function at run-time.
|
||||
*/
|
||||
void
|
||||
png_warning(png_structp png_ptr, png_const_charp message)
|
||||
{
|
||||
@ -49,9 +52,10 @@ png_warning(png_structp png_ptr, png_const_charp message)
|
||||
}
|
||||
|
||||
/* This is the default error handling function. Note that replacements for
|
||||
this function MUST NOT RETURN, or the program will likely crash. This
|
||||
function is used by default, or if the program supplies NULL for the
|
||||
error function pointer in png_set_error_fn(). */
|
||||
* this function MUST NOT RETURN, or the program will likely crash. This
|
||||
* function is used by default, or if the program supplies NULL for the
|
||||
* error function pointer in png_set_error_fn().
|
||||
*/
|
||||
static void
|
||||
png_default_error(png_structp png_ptr, png_const_charp message)
|
||||
{
|
||||
@ -71,9 +75,10 @@ png_default_error(png_structp png_ptr, png_const_charp message)
|
||||
}
|
||||
|
||||
/* This function is called when there is a warning, but the library thinks
|
||||
it can continue anyway. Replacement functions don't have to do anything
|
||||
here if you don't want to. In the default configuration, png_ptr is
|
||||
not used, but it is passed in case it may be useful. */
|
||||
* it can continue anyway. Replacement functions don't have to do anything
|
||||
* here if you don't want to. In the default configuration, png_ptr is
|
||||
* not used, but it is passed in case it may be useful.
|
||||
*/
|
||||
static void
|
||||
png_default_warning(png_structp png_ptr, png_const_charp message)
|
||||
{
|
||||
@ -86,9 +91,10 @@ png_default_warning(png_structp png_ptr, png_const_charp message)
|
||||
}
|
||||
|
||||
/* This function is called when the application wants to use another method
|
||||
of handling errors and warnings. Note that the error function MUST NOT
|
||||
return to the calling routine or serious problems will occur. The return
|
||||
method used in the default routine calls longjmp(png_ptr->jmpbuf, 1) */
|
||||
* of handling errors and warnings. Note that the error function MUST NOT
|
||||
* return to the calling routine or serious problems will occur. The return
|
||||
* method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
|
||||
*/
|
||||
void
|
||||
png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
|
||||
png_error_ptr error_fn, png_error_ptr warning_fn)
|
||||
@ -100,8 +106,9 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
|
||||
|
||||
|
||||
/* This function returns a pointer to the error_ptr associated with the user
|
||||
functions. The application should free any memory associated with this
|
||||
pointer before png_write_destroy and png_read_destroy are called. */
|
||||
* functions. The application should free any memory associated with this
|
||||
* pointer before png_write_destroy and png_read_destroy are called.
|
||||
*/
|
||||
png_voidp
|
||||
png_get_error_ptr(png_structp png_ptr)
|
||||
{
|
||||
|
||||
52
pngget.c
52
pngget.c
@ -1,12 +1,12 @@
|
||||
|
||||
/* pngget.c - retrieval of values from info struct
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
@ -109,6 +109,21 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
png_uint_32
|
||||
png_get_sRGB(png_structp png_ptr, png_infop info_ptr, png_byte *file_srgb_intent)
|
||||
{
|
||||
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sRGB &&
|
||||
*file_srgb_intent != NULL)
|
||||
{
|
||||
png_debug1(1, "in %s retrieval function\n", "sRGB");
|
||||
*file_srgb_intent = (png_byte)info_ptr->srgb_intent;
|
||||
return (PNG_INFO_sRGB);
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_hIST_SUPPORTED)
|
||||
png_uint_32
|
||||
png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
|
||||
@ -196,14 +211,23 @@ png_uint_32
|
||||
png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
|
||||
png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
|
||||
{
|
||||
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs &&
|
||||
res_x != NULL && res_y != NULL && unit_type != NULL)
|
||||
png_uint_32 retval = 0;
|
||||
|
||||
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
|
||||
{
|
||||
png_debug1(1, "in %s retrieval function\n", "pHYs");
|
||||
*res_x = info_ptr->x_pixels_per_unit;
|
||||
*res_y = info_ptr->y_pixels_per_unit;
|
||||
*unit_type = (int)info_ptr->phys_unit_type;
|
||||
return (PNG_INFO_pHYs);
|
||||
if (res_x != NULL && res_y != NULL)
|
||||
{
|
||||
*res_x = info_ptr->x_pixels_per_unit;
|
||||
*res_y = info_ptr->y_pixels_per_unit;
|
||||
retval |= PNG_INFO_pHYs;
|
||||
}
|
||||
if (unit_type != NULL)
|
||||
{
|
||||
*unit_type = (int)info_ptr->phys_unit_type;
|
||||
retval |= PNG_INFO_pHYs;
|
||||
}
|
||||
return (retval);
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
@ -251,7 +275,7 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
|
||||
*text_ptr = info_ptr->text;
|
||||
if (num_text != NULL)
|
||||
*num_text = info_ptr->num_text;
|
||||
return (info_ptr->num_text);
|
||||
return ((png_uint_32)info_ptr->num_text);
|
||||
}
|
||||
return(0);
|
||||
}
|
||||
|
||||
25
pngmem.c
25
pngmem.c
@ -1,15 +1,16 @@
|
||||
|
||||
/* pngmem.c - stub functions for memory allocation
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
|
||||
This file provides a location for all memory allocation. Users which
|
||||
need special memory handling are expected to modify the code in this file
|
||||
to meet their needs. See the instructions at each function. */
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This file provides a location for all memory allocation. Users which
|
||||
* need special memory handling are expected to modify the code in this file
|
||||
* to meet their needs. See the instructions at each function.
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
@ -81,7 +82,7 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
|
||||
png_error(png_ptr, "Cannot Allocate > 64K");
|
||||
#endif
|
||||
|
||||
if (size == (png_uint_32)(65536L))
|
||||
if (size == (png_uint_32)65536L)
|
||||
{
|
||||
if (png_ptr->offset_table == NULL)
|
||||
{
|
||||
@ -139,7 +140,7 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
|
||||
for (i = 0; i < num_blocks; i++)
|
||||
{
|
||||
png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
|
||||
hptr += 65536L;
|
||||
hptr += (png_uint_32)65536L;
|
||||
}
|
||||
|
||||
png_ptr->offset_table_number = num_blocks;
|
||||
|
||||
59
pngpread.c
59
pngpread.c
@ -1,12 +1,12 @@
|
||||
|
||||
/* pngpread.c - read a png file in push mode
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
@ -116,10 +116,11 @@ void
|
||||
png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
|
||||
{
|
||||
/* First we make sure we have enough data for the 4 byte chunk name
|
||||
and the 4 byte chunk length before proceeding with decoding the
|
||||
chunk data. To fully decode each of these chunks, we also make
|
||||
sure we have enough data in the buffer for the 4 byte CRC at the
|
||||
end of every chunk (except IDAT, which is handled separately). */
|
||||
* and the 4 byte chunk length before proceeding with decoding the
|
||||
* chunk data. To fully decode each of these chunks, we also make
|
||||
* sure we have enough data in the buffer for the 4 byte CRC at the
|
||||
* end of every chunk (except IDAT, which is handled separately).
|
||||
*/
|
||||
if (!(png_ptr->flags & PNG_FLAG_HAVE_CHUNK_HEADER))
|
||||
{
|
||||
png_byte chunk_length[4];
|
||||
@ -160,8 +161,9 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
|
||||
{
|
||||
/* If we reach an IDAT chunk, this means we have read all of the
|
||||
header chunks, and we can start reading the image (or if this
|
||||
is called after the image has been read - we have an error). */
|
||||
* header chunks, and we can start reading the image (or if this
|
||||
* is called after the image has been read - we have an error).
|
||||
*/
|
||||
if (png_ptr->mode & PNG_HAVE_IDAT)
|
||||
{
|
||||
if (png_ptr->push_length == 0)
|
||||
@ -227,6 +229,18 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
|
||||
png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
|
||||
}
|
||||
#endif
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
|
||||
{
|
||||
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
||||
{
|
||||
png_push_save_buffer(png_ptr);
|
||||
return;
|
||||
}
|
||||
|
||||
png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
|
||||
}
|
||||
#endif
|
||||
#if defined(PNG_READ_tRNS_SUPPORTED)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
|
||||
{
|
||||
@ -783,11 +797,11 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
|
||||
#ifdef PNG_MAX_MALLOC_64K
|
||||
png_ptr->skip_length = 0; /* This may not be necessary */
|
||||
|
||||
if (length > 65535L) /* We can't hold the entire string in memory */
|
||||
if (length > (png_uint_32)65535L) /* Can't hold the entire string in memory */
|
||||
{
|
||||
png_warning(png_ptr, "tEXt chunk too large to fit in memory");
|
||||
png_ptr->skip_length = length - 65535L;
|
||||
length = 65535L;
|
||||
png_ptr->skip_length = length - (png_uint_32)65535L;
|
||||
length = (png_uint_32)65535L;
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -866,7 +880,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
|
||||
* to be able to store the uncompressed data. Actually, the threshold
|
||||
* is probably around 32K, but it isn't as definite as 64K is.
|
||||
*/
|
||||
if (length > 65535L)
|
||||
if (length > (png_uint_32)65535L)
|
||||
{
|
||||
png_warning(png_ptr, "zTXt chunk too large to fit in memory");
|
||||
png_push_crc_skip(png_ptr, length);
|
||||
@ -1029,11 +1043,12 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
|
||||
#endif
|
||||
|
||||
/* This function is called when we haven't found a handler for this
|
||||
chunk. In the future we will have code here which can handle
|
||||
user-defined callback functions for unknown chunks before they are
|
||||
ignored or cause an error. If there isn't a problem with the
|
||||
chunk itself (ie a bad chunk name or a critical chunk), the chunk
|
||||
is (currently) silently ignored. */
|
||||
* chunk. In the future we will have code here which can handle
|
||||
* user-defined callback functions for unknown chunks before they are
|
||||
* ignored or cause an error. If there isn't a problem with the
|
||||
* chunk itself (ie a bad chunk name or a critical chunk), the chunk
|
||||
* is (currently) silently ignored.
|
||||
*/
|
||||
void
|
||||
png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
{
|
||||
|
||||
100
pngread.c
100
pngread.c
@ -1,19 +1,22 @@
|
||||
|
||||
/* pngread.c - read a PNG file
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This file contains routines that an application calls directly to
|
||||
* read a PNG file or stream.
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
|
||||
/* Create a PNG structure for reading, and allocate any memory needed. */
|
||||
png_structp
|
||||
png_create_read_struct(png_charp user_png_ver, png_voidp error_ptr,
|
||||
png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
|
||||
png_error_ptr error_fn, png_error_ptr warn_fn)
|
||||
{
|
||||
png_structp png_ptr;
|
||||
@ -76,7 +79,6 @@ png_create_read_struct(png_charp user_png_ver, png_voidp error_ptr,
|
||||
return (png_ptr);
|
||||
}
|
||||
|
||||
|
||||
/* Initialize PNG structure for reading, and allocate any memory needed.
|
||||
This interface is depreciated in favour of the png_create_read_struct(),
|
||||
and it will eventually disappear. */
|
||||
@ -215,6 +217,10 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
|
||||
png_handle_sBIT(png_ptr, info_ptr, length);
|
||||
#endif
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
|
||||
png_handle_sRGB(png_ptr, info_ptr, length);
|
||||
#endif
|
||||
#if defined(PNG_READ_tEXt_SUPPORTED)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
|
||||
png_handle_tEXt(png_ptr, info_ptr, length);
|
||||
@ -247,10 +253,11 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
|
||||
png_read_transform_info(png_ptr, info_ptr);
|
||||
}
|
||||
|
||||
/* initialize palette, background, etc, after transformations
|
||||
are set, but before any reading takes place. This allows
|
||||
the user to obtail a gamma corrected palette, for example.
|
||||
If the user doesn't call this, we will do it ourselves. */
|
||||
/* Initialize palette, background, etc, after transformations
|
||||
* are set, but before any reading takes place. This allows
|
||||
* the user to obtail a gamma corrected palette, for example.
|
||||
* If the user doesn't call this, we will do it ourselves.
|
||||
*/
|
||||
void
|
||||
png_start_read_image(png_structp png_ptr)
|
||||
{
|
||||
@ -439,23 +446,26 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
|
||||
}
|
||||
|
||||
/* Read one or more rows of image data. If the image is interlaced,
|
||||
and png_set_interlace_handling() has been called, the rows need to
|
||||
to contain the contents of the rows from the previous pass. If
|
||||
the image has alpha or transparency, and png_handle_alpha() has been
|
||||
called, the rows contents must be initialized to the contents of the
|
||||
screen. "row" holds the actual image, and pixels are placed in it
|
||||
as they arrive. If the image is displayed after each pass, it will
|
||||
appear to "sparkle" in. "display_row" can be used to display a
|
||||
"chunky" progressive image, with finer detail added as it becomes
|
||||
available. If you do not want this "chunky" display, you may pass
|
||||
NULL for display_row. If you do not want the sparkle display, and
|
||||
you have not called png_handle_alpha(), you may pass NULL for rows.
|
||||
If you have called png_handle_alpha(), and the image has either an
|
||||
alpha channel or a transparency chunk, you must provide a buffer for
|
||||
rows. In this case, you do not have to provide a display_row buffer
|
||||
also, but you may. If the image is not interlaced, or if you have
|
||||
not called png_set_interlace_handling(), the display_row buffer will
|
||||
be ignored, so pass NULL to it. */
|
||||
* and png_set_interlace_handling() has been called, the rows need to
|
||||
* contain the contents of the rows from the previous pass. If the
|
||||
* image has alpha or transparency, and png_handle_alpha() has been
|
||||
* called, the rows contents must be initialized to the contents of the
|
||||
* screen.
|
||||
*
|
||||
* "row" holds the actual image, and pixels are placed in it
|
||||
* as they arrive. If the image is displayed after each pass, it will
|
||||
* appear to "sparkle" in. "display_row" can be used to display a
|
||||
* "chunky" progressive image, with finer detail added as it becomes
|
||||
* available. If you do not want this "chunky" display, you may pass
|
||||
* NULL for display_row. If you do not want the sparkle display, and
|
||||
* you have not called png_handle_alpha(), you may pass NULL for rows.
|
||||
* If you have called png_handle_alpha(), and the image has either an
|
||||
* alpha channel or a transparency chunk, you must provide a buffer for
|
||||
* rows. In this case, you do not have to provide a display_row buffer
|
||||
* also, but you may. If the image is not interlaced, or if you have
|
||||
* not called png_set_interlace_handling(), the display_row buffer will
|
||||
* be ignored, so pass NULL to it.
|
||||
*/
|
||||
|
||||
void
|
||||
png_read_rows(png_structp png_ptr, png_bytepp row,
|
||||
@ -491,14 +501,15 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
|
||||
}
|
||||
|
||||
/* Read the entire image. If the image has an alpha channel or a tRNS
|
||||
chunk, and you have called png_handle_alpha(), you will need to
|
||||
initialize the image to the current image that PNG will be overlaying.
|
||||
We set the num_rows again here, in case it was incorrectly set in
|
||||
png_read_start_row() by a call to png_read_update_info() or
|
||||
png_start_read_image() if png_set_interlace_handling() wasn't called
|
||||
prior to either of these functions like it should have been. You can
|
||||
only call this function once. If you desire to have an image for
|
||||
each pass of a interlaced image, use png_read_rows() instead */
|
||||
* chunk, and you have called png_handle_alpha(), you will need to
|
||||
* initialize the image to the current image that PNG will be overlaying.
|
||||
* We set the num_rows again here, in case it was incorrectly set in
|
||||
* png_read_start_row() by a call to png_read_update_info() or
|
||||
* png_start_read_image() if png_set_interlace_handling() wasn't called
|
||||
* prior to either of these functions like it should have been. You can
|
||||
* only call this function once. If you desire to have an image for
|
||||
* each pass of a interlaced image, use png_read_rows() instead.
|
||||
*/
|
||||
void
|
||||
png_read_image(png_structp png_ptr, png_bytepp image)
|
||||
{
|
||||
@ -524,8 +535,9 @@ png_read_image(png_structp png_ptr, png_bytepp image)
|
||||
}
|
||||
|
||||
/* Read the end of the PNG file. Will not read past the end of the
|
||||
file, will verify the end is accurate, and will read any comments
|
||||
or time information at the end of the file, if info is not NULL. */
|
||||
* file, will verify the end is accurate, and will read any comments
|
||||
* or time information at the end of the file, if info is not NULL.
|
||||
*/
|
||||
void
|
||||
png_read_end(png_structp png_ptr, png_infop info_ptr)
|
||||
{
|
||||
@ -594,6 +606,10 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
|
||||
png_handle_sBIT(png_ptr, info_ptr, length);
|
||||
#endif
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
|
||||
png_handle_sRGB(png_ptr, info_ptr, length);
|
||||
#endif
|
||||
#if defined(PNG_READ_tEXt_SUPPORTED)
|
||||
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
|
||||
png_handle_tEXt(png_ptr, info_ptr, length);
|
||||
@ -659,7 +675,6 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
|
||||
void
|
||||
png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
|
||||
{
|
||||
int i;
|
||||
jmp_buf tmp_jmp;
|
||||
png_error_ptr error_fn;
|
||||
png_error_ptr warning_fn;
|
||||
@ -700,6 +715,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
|
||||
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
||||
if (png_ptr->gamma_16_table != NULL)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
|
||||
{
|
||||
png_free(png_ptr, png_ptr->gamma_16_table[i]);
|
||||
@ -710,6 +726,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
|
||||
png_free(png_ptr, png_ptr->gamma_16_table);
|
||||
if (png_ptr->gamma_16_from_1 != NULL)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
|
||||
{
|
||||
png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
|
||||
@ -718,6 +735,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
|
||||
png_free(png_ptr, png_ptr->gamma_16_from_1);
|
||||
if (png_ptr->gamma_16_to_1 != NULL)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
|
||||
{
|
||||
png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
|
||||
|
||||
27
pngrio.c
27
pngrio.c
@ -1,18 +1,19 @@
|
||||
|
||||
/* pngrio.c - functions for data input
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
|
||||
This file provides a location for all input. Users which need
|
||||
special handling are expected to write a function which has the same
|
||||
arguments as this, and perform a similar function, but possibly has
|
||||
a different input method. Note that you shouldn't change this
|
||||
function, but rather write a replacement function and then make
|
||||
libpng use it at run time with png_set_read_fn(...) */
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This file provides a location for all input. Users which need
|
||||
* special handling are expected to write a function which has the same
|
||||
* arguments as this, and perform a similar function, but possibly has
|
||||
* a different input method. Note that you shouldn't change this
|
||||
* function, but rather write a replacement function and then make
|
||||
* libpng use it at run time with png_set_read_fn(...).
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
|
||||
200
pngrtran.c
200
pngrtran.c
@ -1,22 +1,28 @@
|
||||
|
||||
/* pngrtran.c - transforms the data in a row for PNG readers
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This file contains functions optionally called by an application
|
||||
* in order to tell libpng how to handle data when reading a PNG.
|
||||
* Transformations which are used in both reading and writing are
|
||||
* in pngtrans.c.
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
|
||||
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
|
||||
/* With these routines, we avoid an integer divide, which will be slower on
|
||||
many machines. However, it does take more operations than the corresponding
|
||||
divide method, so it may be slower on some RISC systems. There are two
|
||||
shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
||||
The results may also be off by one for certain values. */
|
||||
* many machines. However, it does take more operations than the corresponding
|
||||
* divide method, so it may be slower on some RISC systems. There are two
|
||||
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
||||
* The results may also be off by one for certain values.
|
||||
*/
|
||||
|
||||
/* pixel and background should be in gamma 1.0 space */
|
||||
#define png_composite(composite, pixel, trans, background) \
|
||||
@ -42,9 +48,62 @@
|
||||
#define png_composite_16(composite, pixel, trans, background) \
|
||||
(composite) = (png_uint_16)(((png_uint_32)(pixel) * (png_uint_32)(trans) + \
|
||||
(png_uint_32)(background)*(png_uint_32)(65535L - (png_uint_32)(trans)) + \
|
||||
(png_uint_32)32767) / 65535L)
|
||||
(png_uint_32)32767) / (png_uint_32)65535L)
|
||||
#endif
|
||||
|
||||
/* Set the action on getting a CRC error for an ancillary or critical chunk. */
|
||||
void
|
||||
png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
|
||||
{
|
||||
png_debug(1, "in png_set_crc_action\n");
|
||||
/* Tell libpng how we react to CRC errors in critical chunks */
|
||||
switch (crit_action)
|
||||
{
|
||||
case PNG_CRC_NO_CHANGE: /* leave setting as is */
|
||||
break;
|
||||
case PNG_CRC_WARN_USE: /* warn/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE;
|
||||
break;
|
||||
case PNG_CRC_QUIET_USE: /* quiet/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE |
|
||||
PNG_FLAG_CRC_CRITICAL_IGNORE;
|
||||
break;
|
||||
case PNG_CRC_WARN_DISCARD: /* not a valid action for critical data */
|
||||
png_warning(png_ptr, "Can't discard critical data on CRC error.");
|
||||
case PNG_CRC_ERROR_QUIT: /* error/quit */
|
||||
case PNG_CRC_DEFAULT:
|
||||
default:
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
|
||||
break;
|
||||
}
|
||||
|
||||
switch (ancil_action)
|
||||
{
|
||||
case PNG_CRC_NO_CHANGE: /* leave setting as is */
|
||||
break;
|
||||
case PNG_CRC_WARN_USE: /* warn/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE;
|
||||
break;
|
||||
case PNG_CRC_QUIET_USE: /* quiet/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE |
|
||||
PNG_FLAG_CRC_ANCILLARY_NOWARN;
|
||||
break;
|
||||
case PNG_CRC_ERROR_QUIT: /* error/quit */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN;
|
||||
break;
|
||||
case PNG_CRC_WARN_DISCARD: /* warn/discard data */
|
||||
case PNG_CRC_DEFAULT:
|
||||
default:
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
||||
/* handle alpha and tRNS via a background color */
|
||||
void
|
||||
@ -89,12 +148,13 @@ png_set_strip_alpha(png_structp png_ptr)
|
||||
|
||||
#if defined(PNG_READ_DITHER_SUPPORTED)
|
||||
/* Dither file to 8 bit. Supply a palette, the current number
|
||||
of elements in the palette, the maximum number of elements
|
||||
allowed, and a histogram if possible. If the current number
|
||||
of colors is greater then the maximum number, the palette will be
|
||||
modified to fit in the maximum number. "full_dither" indicates
|
||||
whether we need a dithering cube set up for RGB images, or if we
|
||||
simply are reducing the number of colors in a paletted image. */
|
||||
* of elements in the palette, the maximum number of elements
|
||||
* allowed, and a histogram if possible. If the current number
|
||||
* of colors is greater then the maximum number, the palette will be
|
||||
* modified to fit in the maximum number. "full_dither" indicates
|
||||
* whether we need a dithering cube set up for RGB images, or if we
|
||||
* simply are reducing the number of colors in a paletted image.
|
||||
*/
|
||||
|
||||
typedef struct png_dsort_struct
|
||||
{
|
||||
@ -478,9 +538,10 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
|
||||
|
||||
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
||||
/* Transform the image from the file_gamma to the screen_gamma. We
|
||||
only do transformations on images where the file_gamma and screen_gamma
|
||||
are not close reciprocals, otherwise it slows things down slightly, and
|
||||
also needlessly introduces small errors. */
|
||||
* only do transformations on images where the file_gamma and screen_gamma
|
||||
* are not close reciprocals, otherwise it slows things down slightly, and
|
||||
* also needlessly introduces small errors.
|
||||
*/
|
||||
void
|
||||
png_set_gamma(png_structp png_ptr, double screen_gamma, double file_gamma)
|
||||
{
|
||||
@ -494,8 +555,9 @@ png_set_gamma(png_structp png_ptr, double screen_gamma, double file_gamma)
|
||||
|
||||
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
||||
/* Expand paletted images to rgb, expand grayscale images of
|
||||
less then 8 bit depth to 8 bit depth, and expand tRNS chunks
|
||||
to alpha channels. */
|
||||
* less then 8 bit depth to 8 bit depth, and expand tRNS chunks
|
||||
* to alpha channels.
|
||||
*/
|
||||
void
|
||||
png_set_expand(png_structp png_ptr)
|
||||
{
|
||||
@ -515,8 +577,9 @@ png_set_gray_to_rgb(png_structp png_ptr)
|
||||
|
||||
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
||||
/* Convert a RGB image to a grayscale of the given width. This would
|
||||
allow us, for example, to convert a 24 bpp RGB image into an 8 or
|
||||
16 bpp grayscale image. (Not yet implemented.) */
|
||||
* allow us, for example, to convert a 24 bpp RGB image into an 8 or
|
||||
* 16 bpp grayscale image. (Not yet implemented.)
|
||||
*/
|
||||
void
|
||||
png_set_rgb_to_gray(png_structp png_ptr, int gray_bits)
|
||||
{
|
||||
@ -527,7 +590,8 @@ png_set_rgb_to_gray(png_structp png_ptr, int gray_bits)
|
||||
#endif
|
||||
|
||||
/* Initialize everything needed for the read. This includes modifying
|
||||
the palette */
|
||||
* the palette.
|
||||
*/
|
||||
void
|
||||
png_init_read_transformations(png_structp png_ptr)
|
||||
{
|
||||
@ -810,8 +874,9 @@ png_init_read_transformations(png_structp png_ptr)
|
||||
}
|
||||
|
||||
/* Modify the info structure to reflect the transformations. The
|
||||
info should be updated so a PNG file could be written with it,
|
||||
assuming the transformations result in valid PNG data. */
|
||||
* info should be updated so a PNG file could be written with it,
|
||||
* assuming the transformations result in valid PNG data.
|
||||
*/
|
||||
void
|
||||
png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
|
||||
{
|
||||
@ -910,9 +975,10 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
|
||||
(png_size_t)((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
|
||||
}
|
||||
|
||||
/* transform the row. The order of transformations is significant,
|
||||
and is very touchy. If you add a transformation, take care to
|
||||
decide how it fits in with the other transformations here. */
|
||||
/* Transform the row. The order of transformations is significant,
|
||||
* and is very touchy. If you add a transformation, take care to
|
||||
* decide how it fits in with the other transformations here.
|
||||
*/
|
||||
void
|
||||
png_do_read_transformations(png_structp png_ptr)
|
||||
{
|
||||
@ -955,7 +1021,9 @@ png_do_read_transformations(png_structp png_ptr)
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
||||
if (png_ptr->transformations & PNG_BACKGROUND)
|
||||
if ((png_ptr->transformations & PNG_BACKGROUND) &&
|
||||
((png_ptr->num_trans != 0 ) ||
|
||||
(png_ptr->color_type & PNG_COLOR_MASK_ALPHA)))
|
||||
png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
||||
&(png_ptr->trans_values), &(png_ptr->background),
|
||||
&(png_ptr->background_1),
|
||||
@ -1041,11 +1109,12 @@ png_do_read_transformations(png_structp png_ptr)
|
||||
}
|
||||
|
||||
#if defined(PNG_READ_PACK_SUPPORTED)
|
||||
/* unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel,
|
||||
without changing the actual values. Thus, if you had a row with
|
||||
a bit depth of 1, you would end up with bytes that only contained
|
||||
the numbers 0 or 1. If you would rather they contain 0 and 255, use
|
||||
png_do_shift() after this. */
|
||||
/* Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel,
|
||||
* without changing the actual values. Thus, if you had a row with
|
||||
* a bit depth of 1, you would end up with bytes that only contained
|
||||
* the numbers 0 or 1. If you would rather they contain 0 and 255, use
|
||||
* png_do_shift() after this.
|
||||
*/
|
||||
void
|
||||
png_do_unpack(png_row_infop row_info, png_bytep row)
|
||||
{
|
||||
@ -1131,10 +1200,11 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_SHIFT_SUPPORTED)
|
||||
/* reverse the effects of png_do_shift. This routine merely shifts the
|
||||
pixels back to their significant bits values. Thus, if you have
|
||||
a row of bit depth 8, but only 5 are significant, this will shift
|
||||
the values back to 0 through 31 */
|
||||
/* Reverse the effects of png_do_shift. This routine merely shifts the
|
||||
* pixels back to their significant bits values. Thus, if you have
|
||||
* a row of bit depth 8, but only 5 are significant, this will shift
|
||||
* the values back to 0 through 31.
|
||||
*/
|
||||
void
|
||||
png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
|
||||
{
|
||||
@ -1268,7 +1338,7 @@ png_do_chop(png_row_infop row_info, png_bytep row)
|
||||
*
|
||||
* What the ideal calculation should be:
|
||||
*dp = (((((png_uint_32)(*sp) << 8) |
|
||||
(png_uint_32)(*(sp + 1))) * 255 + 127) / 65535;
|
||||
(png_uint_32)(*(sp + 1))) * 255 + 127) / (png_uint_32)65535L;
|
||||
|
||||
* Approximate calculation with shift/add instead of multiply/divide:
|
||||
*dp = ((((png_uint_32)(*sp) << 8) |
|
||||
@ -1527,10 +1597,11 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
|
||||
}
|
||||
#endif
|
||||
|
||||
/* build a grayscale palette. Palette is assumed to be 1 << bit_depth
|
||||
large of png_color. This lets grayscale images be treated as
|
||||
paletted. Most useful for gamma correction and simplification
|
||||
of code. */
|
||||
/* Build a grayscale palette. Palette is assumed to be 1 << bit_depth
|
||||
* large of png_color. This lets grayscale images be treated as
|
||||
* paletted. Most useful for gamma correction and simplification
|
||||
* of code.
|
||||
*/
|
||||
void
|
||||
png_build_grayscale_palette(int bit_depth, png_colorp palette)
|
||||
{
|
||||
@ -1762,8 +1833,9 @@ png_correct_palette(png_structp png_ptr, png_colorp palette,
|
||||
|
||||
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
||||
/* Replace any alpha or transparency with the supplied background color.
|
||||
"background" is already in the screen gamma, while "background_1" is
|
||||
at a gamma of 1.0. Paletted files have already been taken care of. */
|
||||
* "background" is already in the screen gamma, while "background_1" is
|
||||
* at a gamma of 1.0. Paletted files have already been taken care of.
|
||||
*/
|
||||
void
|
||||
png_do_background(png_row_infop row_info, png_bytep row,
|
||||
png_color_16p trans_values, png_color_16p background,
|
||||
@ -2330,7 +2402,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
|
||||
png_composite_16(v, g, a, background->green);
|
||||
*(dp + 2) = (png_byte)((v >> 8) & 0xff);
|
||||
*(dp + 3) = (png_byte)(v & 0xff);
|
||||
png_composite_16(v, g, a, background->green);
|
||||
png_composite_16(v, b, a, background->blue);
|
||||
*(dp + 4) = (png_byte)((v >> 8) & 0xff);
|
||||
*(dp + 5) = (png_byte)(v & 0xff);
|
||||
}
|
||||
@ -2356,10 +2428,11 @@ png_do_background(png_row_infop row_info, png_bytep row,
|
||||
|
||||
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
||||
/* Gamma correct the image, avoiding the alpha channel. Make sure
|
||||
you do this after you deal with the trasparency issue on grayscale
|
||||
or rgb images. If your bit depth is 8, use gamma_table, if it
|
||||
is 16, use gamma_16_table and gamma_shift. Build these with
|
||||
build_gamma_table(). */
|
||||
* you do this after you deal with the trasparency issue on grayscale
|
||||
* or rgb images. If your bit depth is 8, use gamma_table, if it
|
||||
* is 16, use gamma_16_table and gamma_shift. Build these with
|
||||
* build_gamma_table().
|
||||
*/
|
||||
void
|
||||
png_do_gamma(png_row_infop row_info, png_bytep row,
|
||||
png_bytep gamma_table, png_uint_16pp gamma_16_table,
|
||||
@ -2488,8 +2561,8 @@ png_do_gamma(png_row_infop row_info, png_bytep row,
|
||||
int msb = *sp & 0xf0;
|
||||
int lsb = *sp & 0x0f;
|
||||
|
||||
*sp = (((int)gamma_table[msb | msb >> 4] + 8) & 0xf0) |
|
||||
(((int)gamma_table[lsb << 4 | lsb] + 8) >> 4);
|
||||
*sp = (((int)gamma_table[msb | (msb >> 4)]) & 0xf0) |
|
||||
(((int)gamma_table[(lsb << 4) | lsb]) >> 4);
|
||||
sp++;
|
||||
}
|
||||
}
|
||||
@ -2521,8 +2594,9 @@ png_do_gamma(png_row_infop row_info, png_bytep row,
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
||||
/* expands a palette row to an rgb or rgba row depending
|
||||
upon whether you supply trans and num_trans */
|
||||
/* Expands a palette row to an rgb or rgba row depending
|
||||
* upon whether you supply trans and num_trans.
|
||||
*/
|
||||
void
|
||||
png_do_expand_palette(png_row_infop row_info, png_bytep row,
|
||||
png_colorp palette, png_bytep trans, int num_trans)
|
||||
@ -2662,8 +2736,9 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
|
||||
}
|
||||
}
|
||||
|
||||
/* if the bit depth < 8, it is expanded to 8. Also, if the
|
||||
transparency value is supplied, an alpha channel is built. */
|
||||
/* If the bit depth < 8, it is expanded to 8. Also, if the
|
||||
* transparency value is supplied, an alpha channel is built.
|
||||
*/
|
||||
void
|
||||
png_do_expand(png_row_infop row_info, png_bytep row,
|
||||
png_color_16p trans_value)
|
||||
@ -2958,9 +3033,10 @@ static int png_gamma_shift[] =
|
||||
{0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0};
|
||||
|
||||
/* We build the 8- or 16-bit gamma tables here. Note that for 16-bit
|
||||
tables, we don't make a full table if we are reducing to 8-bit in
|
||||
the future. Note also how the gamma_16 tables are segmented so that
|
||||
we don't need to allocate > 64K chunks for a full 16-bit table. */
|
||||
* tables, we don't make a full table if we are reducing to 8-bit in
|
||||
* the future. Note also how the gamma_16 tables are segmented so that
|
||||
* we don't need to allocate > 64K chunks for a full 16-bit table.
|
||||
*/
|
||||
void
|
||||
png_build_gamma_table(png_structp png_ptr)
|
||||
{
|
||||
|
||||
201
pngrutil.c
201
pngrutil.c
@ -1,12 +1,15 @@
|
||||
|
||||
/* pngrutil.c - utilities to read a PNG file
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This file contains routines which are only called from within
|
||||
* libpng itself during the course of reading an image.
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
@ -57,59 +60,6 @@ png_get_uint_16(png_bytep buf)
|
||||
}
|
||||
#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
|
||||
|
||||
/* Set the action on getting a CRC error for an ancillary or critical chunk. */
|
||||
void
|
||||
png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
|
||||
{
|
||||
png_debug(1, "in png_set_crc_action\n");
|
||||
/* Tell libpng how we react to CRC errors in critical chunks */
|
||||
switch (crit_action)
|
||||
{
|
||||
case PNG_CRC_NO_CHANGE: /* leave setting as is */
|
||||
break;
|
||||
case PNG_CRC_WARN_USE: /* warn/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE;
|
||||
break;
|
||||
case PNG_CRC_QUIET_USE: /* quiet/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE |
|
||||
PNG_FLAG_CRC_CRITICAL_IGNORE;
|
||||
break;
|
||||
case PNG_CRC_WARN_DISCARD: /* not a valid action for critical data */
|
||||
png_warning(png_ptr, "Can't discard critical data on CRC error.");
|
||||
case PNG_CRC_ERROR_QUIT: /* error/quit */
|
||||
case PNG_CRC_DEFAULT:
|
||||
default:
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
|
||||
break;
|
||||
}
|
||||
|
||||
switch (ancil_action)
|
||||
{
|
||||
case PNG_CRC_NO_CHANGE: /* leave setting as is */
|
||||
break;
|
||||
case PNG_CRC_WARN_USE: /* warn/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE;
|
||||
break;
|
||||
case PNG_CRC_QUIET_USE: /* quiet/use data */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE |
|
||||
PNG_FLAG_CRC_ANCILLARY_NOWARN;
|
||||
break;
|
||||
case PNG_CRC_ERROR_QUIT: /* error/quit */
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN;
|
||||
break;
|
||||
case PNG_CRC_WARN_DISCARD: /* warn/discard data */
|
||||
case PNG_CRC_DEFAULT:
|
||||
default:
|
||||
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Read data, and (optionally) run it through the CRC. */
|
||||
void
|
||||
png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
|
||||
@ -185,11 +135,7 @@ png_crc_error(png_structp png_ptr)
|
||||
if (need_crc)
|
||||
{
|
||||
crc = png_get_uint_32(crc_bytes);
|
||||
#ifdef PNG_USE_OWN_CRC
|
||||
return (((crc^0xffffffffL)&0xffffffffL) != (png_ptr->crc&0xffffffffL));
|
||||
#else
|
||||
return (crc != png_ptr->crc);
|
||||
#endif
|
||||
}
|
||||
else
|
||||
return 0;
|
||||
@ -228,7 +174,8 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
interlace_type = buf[12];
|
||||
|
||||
/* check for width and height valid values */
|
||||
if (width == 0 || width > 2147483647 || height == 0 || height > 2147483647)
|
||||
if (width == 0 || width > (png_uint_32)2147483647L || height == 0 ||
|
||||
height > (png_uint_32)2147483647L)
|
||||
png_error(png_ptr, "Invalid image size in IHDR");
|
||||
|
||||
/* check other values */
|
||||
@ -246,7 +193,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
|
||||
png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
|
||||
|
||||
if (interlace_type > PNG_INTERLACE_ADAM7)
|
||||
if (interlace_type >= PNG_INTERLACE_LAST)
|
||||
png_error(png_ptr, "Unknown interlace method in IHDR");
|
||||
|
||||
if (compression_type != PNG_COMPRESSION_TYPE_BASE)
|
||||
@ -337,7 +284,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
}
|
||||
|
||||
num = (int)length / 3;
|
||||
palette = (png_colorp)png_malloc(png_ptr, num * sizeof (png_color));
|
||||
palette = (png_colorp)png_zalloc(png_ptr, num, sizeof (png_color));
|
||||
png_ptr->flags |= PNG_FLAG_FREE_PALETTE;
|
||||
for (i = 0; i < num; i++)
|
||||
{
|
||||
@ -457,6 +404,26 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
if (igamma == 0)
|
||||
return;
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
if ((png_ptr->mode & PNG_HAVE_sRGB))
|
||||
if(igamma != 50000)
|
||||
{
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect gAMA value when sRGB is also present");
|
||||
return;
|
||||
}
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
if (png_ptr->mode & PNG_HAVE_sRGB)
|
||||
if(igamma != 50000)
|
||||
{
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect gAMA value when sRGB is also present");
|
||||
return;
|
||||
}
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED */
|
||||
|
||||
file_gamma = (float)igamma / (float)100000.0;
|
||||
png_ptr->gamma = file_gamma;
|
||||
png_set_gAMA(png_ptr, info_ptr, file_gamma);
|
||||
@ -483,8 +450,10 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
return;
|
||||
}
|
||||
else if (png_ptr->mode & PNG_HAVE_PLTE)
|
||||
{
|
||||
/* Should be an error, but we can cope with it */
|
||||
png_warning(png_ptr, "Out of place sBIT chunk");
|
||||
}
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT)
|
||||
{
|
||||
png_warning(png_ptr, "Duplicate sBIT chunk");
|
||||
@ -545,7 +514,8 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
else if (png_ptr->mode & PNG_HAVE_PLTE)
|
||||
/* Should be an error, but we can cope with it */
|
||||
png_warning(png_ptr, "Missing PLTE before cHRM");
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_cHRM)
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_cHRM
|
||||
&& !(info_ptr->valid & PNG_INFO_sRGB))
|
||||
{
|
||||
png_warning(png_ptr, "Duplicate cHRM chunk");
|
||||
png_crc_finish(png_ptr, length);
|
||||
@ -626,11 +596,92 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
if (png_crc_finish(png_ptr, 0))
|
||||
return;
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
if ((png_ptr->mode & PNG_HAVE_sRGB))
|
||||
if(white_x != .3127 || white_y != .329 || red_x != .64 || red_y != .33 ||
|
||||
green_x != .3 || green_y != .6 || blue_x != .15 || blue_y != .06)
|
||||
{
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect cHRM value when sRGB is also present");
|
||||
return;
|
||||
}
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED */
|
||||
|
||||
png_set_cHRM(png_ptr, info_ptr,
|
||||
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
void
|
||||
png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
{
|
||||
png_byte intent;
|
||||
png_byte buf[1];
|
||||
float file_gamma;
|
||||
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
|
||||
|
||||
png_debug(1, "in png_handle_sRGB\n");
|
||||
|
||||
if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
||||
png_error(png_ptr, "Missing IHDR before sRGB");
|
||||
else if (png_ptr->mode & PNG_HAVE_IDAT)
|
||||
{
|
||||
png_warning(png_ptr, "Invalid sRGB after IDAT");
|
||||
png_crc_finish(png_ptr, length);
|
||||
return;
|
||||
}
|
||||
else if (png_ptr->mode & PNG_HAVE_PLTE)
|
||||
/* Should be an error, but we can cope with it */
|
||||
png_warning(png_ptr, "Out of place sRGB chunk");
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sRGB)
|
||||
{
|
||||
png_warning(png_ptr, "Duplicate sRGB chunk");
|
||||
png_crc_finish(png_ptr, length);
|
||||
return;
|
||||
}
|
||||
|
||||
if (length != 1)
|
||||
{
|
||||
png_warning(png_ptr, "Incorrect sRGB chunk length");
|
||||
png_crc_finish(png_ptr, length);
|
||||
return;
|
||||
}
|
||||
|
||||
png_crc_read(png_ptr, buf, 1);
|
||||
if (png_crc_finish(png_ptr, 0))
|
||||
return;
|
||||
|
||||
intent = buf[0];
|
||||
/* check for bad intent */
|
||||
if (intent > 3)
|
||||
{
|
||||
png_warning(png_ptr, "Unknown sRGB intent");
|
||||
return;
|
||||
}
|
||||
|
||||
/* if we really want to be paranoid we could check for
|
||||
already defined gamma and chrm with values that are
|
||||
inconsistent with sRGB -- for now, just ignore them */
|
||||
|
||||
file_gamma = 0.45;
|
||||
png_set_gAMA(png_ptr, info_ptr, file_gamma);
|
||||
|
||||
white_x = 0.3127;
|
||||
white_y = 0.3290;
|
||||
red_x = 0.6400;
|
||||
red_y = 0.3300;
|
||||
green_x = 0.3000;
|
||||
green_y = 0.6000;
|
||||
blue_x = 0.1500;
|
||||
blue_y = 0.0600;
|
||||
|
||||
png_set_cHRM(png_ptr, info_ptr,
|
||||
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
|
||||
|
||||
png_set_sRGB(png_ptr, info_ptr, intent);
|
||||
}
|
||||
#endif
|
||||
#if defined(PNG_READ_tRNS_SUPPORTED)
|
||||
void
|
||||
png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
@ -683,7 +734,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
}
|
||||
|
||||
png_crc_read(png_ptr, buf, (png_size_t)length);
|
||||
png_ptr->num_trans = 3;
|
||||
png_ptr->num_trans = 1;
|
||||
png_ptr->trans_values.red = png_get_uint_16(buf);
|
||||
png_ptr->trans_values.green = png_get_uint_16(buf + 2);
|
||||
png_ptr->trans_values.blue = png_get_uint_16(buf + 4);
|
||||
@ -1113,11 +1164,11 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
png_ptr->mode |= PNG_AFTER_IDAT;
|
||||
|
||||
#ifdef PNG_MAX_MALLOC_64K
|
||||
if (length > 65535L)
|
||||
if (length > (png_uint_32)65535L)
|
||||
{
|
||||
png_warning(png_ptr, "tEXt chunk too large to fit in memory");
|
||||
skip = length - 65535L;
|
||||
length = 65535L;
|
||||
skip = length - (png_uint_32)65535L;
|
||||
length = (png_uint_32)65535L;
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -1171,7 +1222,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
#ifdef PNG_MAX_MALLOC_64K
|
||||
/* We will no doubt have problems with chunks even half this size, but
|
||||
there is no hard and fast rule to tell us where to stop. */
|
||||
if (length > 65535L)
|
||||
if (length > (png_uint_32)65535L)
|
||||
{
|
||||
png_warning(png_ptr,"zTXt chunk too large to fit in memory");
|
||||
png_crc_finish(png_ptr, length);
|
||||
@ -2113,13 +2164,13 @@ png_read_start_row(png_structp png_ptr)
|
||||
rowbytes = ((rowbytes * (png_uint_32)max_pixel_depth + 7) >> 3) +
|
||||
1 + ((max_pixel_depth + 7) >> 3);
|
||||
#ifdef PNG_MAX_MALLOC_64K
|
||||
if (rowbytes > 65536L)
|
||||
if (rowbytes > (png_uint_32)65536L)
|
||||
png_error(png_ptr, "This image requires a row greater than 64KB");
|
||||
#endif
|
||||
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, rowbytes);
|
||||
|
||||
#ifdef PNG_MAX_MALLOC_64K
|
||||
if (png_ptr->rowbytes + 1 > 65536L)
|
||||
if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
|
||||
png_error(png_ptr, "This image requires a row greater than 64KB");
|
||||
#endif
|
||||
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1);
|
||||
|
||||
74
pngset.c
74
pngset.c
@ -1,12 +1,17 @@
|
||||
|
||||
/* pngset.c - storage of image information into info struct
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* The functions here are used during reads to store data from the file
|
||||
* into the info struct, and during writes to store application data
|
||||
* into the info struct for writing into the file. This abstracts the
|
||||
* info struct and allows us to change the structure in the future.
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
@ -205,8 +210,57 @@ png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \
|
||||
defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
|
||||
void
|
||||
png_set_sRGB(png_structp png_ptr, png_infop info_ptr, png_byte intent)
|
||||
{
|
||||
png_debug1(1, "in %s storage function\n", "sRGB");
|
||||
if (info_ptr == NULL)
|
||||
return;
|
||||
|
||||
info_ptr->srgb_intent = intent;
|
||||
info_ptr->valid |= PNG_INFO_sRGB;
|
||||
}
|
||||
void
|
||||
png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
|
||||
png_byte intent)
|
||||
{
|
||||
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
|
||||
float file_gamma;
|
||||
#endif
|
||||
#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
|
||||
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
|
||||
#endif
|
||||
png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
|
||||
if (info_ptr == NULL)
|
||||
return;
|
||||
|
||||
png_set_sRGB(png_ptr, info_ptr, intent);
|
||||
|
||||
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
|
||||
file_gamma = 0.45;
|
||||
png_set_gAMA(png_ptr, info_ptr, file_gamma);
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
|
||||
white_x = 0.3127;
|
||||
white_y = 0.3290;
|
||||
red_x = 0.6400;
|
||||
red_y = 0.3300;
|
||||
green_x = 0.3000;
|
||||
green_y = 0.6000;
|
||||
blue_x = 0.1500;
|
||||
blue_y = 0.0600;
|
||||
|
||||
png_set_cHRM(png_ptr, info_ptr,
|
||||
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
|
||||
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
|
||||
defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
|
||||
void
|
||||
png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
|
||||
int num_text)
|
||||
@ -304,6 +358,8 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
|
||||
{
|
||||
png_memcpy(&(info_ptr->trans_values), trans_values,
|
||||
sizeof(png_color_16));
|
||||
if (num_trans == 0)
|
||||
num_trans = 1;
|
||||
}
|
||||
info_ptr->num_trans = (png_uint_16)num_trans;
|
||||
info_ptr->valid |= PNG_INFO_tRNS;
|
||||
|
||||
50
pngtest.c
50
pngtest.c
@ -1,12 +1,30 @@
|
||||
|
||||
/* pngtest.c - a simple test program to test libpng
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This program reads in a PNG image, writes it out again, and then
|
||||
* compares the two files. If the files are identical, this shows that
|
||||
* the basic chunk handling, filtering, and (de)compression code is working
|
||||
* properly. It does not currently test all of the transforms, although
|
||||
* it probably should.
|
||||
*
|
||||
* The program will fail in certain legitimate cases:
|
||||
* 1) when the compression level or filter selection method is changed.
|
||||
* 2) when the chunk size is smaller than 8K.
|
||||
* 3) unknown ancillary chunks exist in the input file.
|
||||
* 4) others not listed here...
|
||||
* In these cases, it is best to check with another tool such as "pngcheck"
|
||||
* to see what the differences between the two images are.
|
||||
*
|
||||
* If a filename is given on the command-line, then this file is used
|
||||
* for the input, rather than the default "pngtest.png". This allows
|
||||
* testing a wide variety of files easily.
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
@ -28,11 +46,11 @@
|
||||
|
||||
/* input and output filenames */
|
||||
#ifdef RISCOS
|
||||
char *inname = "pngtest_png";
|
||||
char *outname = "pngout_png";
|
||||
PNG_CONST char *inname = "pngtest_png";
|
||||
PNG_CONST char *outname = "pngout_png";
|
||||
#else
|
||||
char *inname = "pngtest.png";
|
||||
char *outname = "pngout.png";
|
||||
PNG_CONST char *inname = "pngtest.png";
|
||||
PNG_CONST char *outname = "pngout.png";
|
||||
#endif
|
||||
|
||||
char inbuf[256], outbuf[256];
|
||||
@ -182,6 +200,16 @@ main(int argc, char *argv[])
|
||||
}
|
||||
}
|
||||
#endif
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED) && defined(PNG_WRITE_sRGB_SUPPORTED)
|
||||
{
|
||||
png_byte intent;
|
||||
|
||||
if (png_get_sRGB(read_ptr, read_info_ptr, &intent))
|
||||
{
|
||||
png_set_sRGB(write_ptr, write_info_ptr, intent);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
#if defined(PNG_READ_hIST_SUPPORTED) && defined(PNG_WRITE_hIST_SUPPORTED)
|
||||
{
|
||||
png_uint_16p hist;
|
||||
|
||||
14
pngtrans.c
14
pngtrans.c
@ -1,12 +1,12 @@
|
||||
|
||||
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
|
||||
27
pngwio.c
27
pngwio.c
@ -1,18 +1,19 @@
|
||||
|
||||
/* pngwio.c - functions for data output
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
|
||||
This file provides a location for all output. Users which need
|
||||
special handling are expected to write functions which have the same
|
||||
arguments as these, and perform similar functions, but possibly use
|
||||
different output methods. Note that you shouldn't change these
|
||||
functions, but rather write replacement functions and then change
|
||||
them at run time with png_set_write_fn(...) */
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*
|
||||
* This file provides a location for all output. Users which need
|
||||
* special handling are expected to write functions which have the same
|
||||
* arguments as these, and perform similar functions, but possibly use
|
||||
* different output methods. Note that you shouldn't change these
|
||||
* functions, but rather write replacement functions and then change
|
||||
* them at run time with png_set_write_fn(...).
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
|
||||
90
pngwrite.c
90
pngwrite.c
@ -1,12 +1,12 @@
|
||||
|
||||
/* pngwrite.c - general routines to write a PNG file
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
/* get internal access to png.h */
|
||||
#define PNG_INTERNAL
|
||||
@ -38,6 +38,10 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
|
||||
if (info_ptr->valid & PNG_INFO_gAMA)
|
||||
png_write_gAMA(png_ptr, info_ptr->gamma);
|
||||
#endif
|
||||
#if defined(PNG_WRITE_sRGB_SUPPORTED)
|
||||
if (info_ptr->valid & PNG_INFO_sRGB)
|
||||
png_write_sRGB(png_ptr, info_ptr->srgb_intent);
|
||||
#endif
|
||||
#if defined(PNG_WRITE_sBIT_SUPPORTED)
|
||||
if (info_ptr->valid & PNG_INFO_sBIT)
|
||||
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
|
||||
@ -128,9 +132,10 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
|
||||
}
|
||||
|
||||
/* Writes the end of the PNG file. If you don't want to write comments or
|
||||
time information, you can pass NULL for info. If you already wrote these
|
||||
in png_write_info(), do not write them again here. If you have long
|
||||
comments, I suggest writing them here, and compressing them. */
|
||||
* time information, you can pass NULL for info. If you already wrote these
|
||||
* in png_write_info(), do not write them again here. If you have long
|
||||
* comments, I suggest writing them here, and compressing them.
|
||||
*/
|
||||
void
|
||||
png_write_end(png_structp png_ptr, png_infop info_ptr)
|
||||
{
|
||||
@ -190,6 +195,28 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
|
||||
png_write_IEND(png_ptr);
|
||||
}
|
||||
|
||||
#if defined(PNG_TIME_RFC1152_SUPPORTED)
|
||||
/* Convert the supplied time into an RFC 1152 string suitable for use in
|
||||
* a "Creation Time" or other text-based time string.
|
||||
*/
|
||||
png_charp
|
||||
png_convert_to_rfc1152(png_structp png_ptr, png_timep ptime)
|
||||
{
|
||||
const char *short_months[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
||||
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
|
||||
|
||||
if (png_ptr->time_buffer == NULL)
|
||||
{
|
||||
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, 29*sizeof(char));
|
||||
}
|
||||
|
||||
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
|
||||
ptime->day % 31, short_months[ptime->month], ptime->year,
|
||||
ptime->hour % 24, ptime->minute % 60, ptime->second % 61);
|
||||
return png_ptr->time_buffer;
|
||||
}
|
||||
#endif /* PNG_TIME_RFC1152_SUPPORTED */
|
||||
|
||||
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
||||
void
|
||||
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
|
||||
@ -261,6 +288,11 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
|
||||
|
||||
png_set_write_fn(png_ptr, NULL, NULL, NULL);
|
||||
|
||||
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
|
||||
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
|
||||
1, NULL, NULL);
|
||||
#endif
|
||||
|
||||
return (png_ptr);
|
||||
}
|
||||
|
||||
@ -292,10 +324,11 @@ png_write_init(png_structp png_ptr)
|
||||
#endif
|
||||
}
|
||||
|
||||
/* write a few rows of image data. If the image is interlaced,
|
||||
either you will have to write the 7 sub images, or, if you
|
||||
have called png_set_interlace_handling(), you will have to
|
||||
"write" the image seven times */
|
||||
/* Write a few rows of image data. If the image is interlaced,
|
||||
* either you will have to write the 7 sub images, or, if you
|
||||
* have called png_set_interlace_handling(), you will have to
|
||||
* "write" the image seven times.
|
||||
*/
|
||||
void
|
||||
png_write_rows(png_structp png_ptr, png_bytepp row,
|
||||
png_uint_32 num_rows)
|
||||
@ -311,8 +344,9 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
|
||||
}
|
||||
}
|
||||
|
||||
/* write the image. You only need to call this function once, even
|
||||
if you are writing an interlaced image. */
|
||||
/* Write the image. You only need to call this function once, even
|
||||
* if you are writing an interlaced image.
|
||||
*/
|
||||
void
|
||||
png_write_image(png_structp png_ptr, png_bytepp image)
|
||||
{
|
||||
@ -339,7 +373,8 @@ png_write_image(png_structp png_ptr, png_bytepp image)
|
||||
void
|
||||
png_write_row(png_structp png_ptr, png_bytep row)
|
||||
{
|
||||
png_debug(1, "in png_write_row\n");
|
||||
png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
|
||||
png_ptr->row_number, png_ptr->pass);
|
||||
/* initialize transformations and other stuff if first time */
|
||||
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
|
||||
{
|
||||
@ -415,12 +450,12 @@ png_write_row(png_structp png_ptr, png_bytep row)
|
||||
png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
|
||||
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
|
||||
|
||||
png_debug1(4, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
|
||||
png_debug1(4, "row_info->width = %d\n", png_ptr->row_info.width);
|
||||
png_debug1(4, "row_info->channels = %d\n", png_ptr->row_info.channels);
|
||||
png_debug1(4, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
|
||||
png_debug1(4, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
|
||||
png_debug1(4, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
|
||||
png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
|
||||
png_debug1(3, "row_info->width = %d\n", png_ptr->row_info.width);
|
||||
png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
|
||||
png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
|
||||
png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
|
||||
png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
|
||||
|
||||
/* Copy user's row into buffer, leaving room for filter byte. */
|
||||
png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);
|
||||
@ -527,6 +562,9 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
|
||||
|
||||
if (info_ptr != NULL)
|
||||
{
|
||||
#ifdef PNG_WRITE_tEXt_SUPPORTED
|
||||
png_free(png_ptr, info_ptr->text);
|
||||
#endif
|
||||
png_destroy_struct((png_voidp)info_ptr);
|
||||
*info_ptr_ptr = (png_infop)NULL;
|
||||
}
|
||||
@ -561,6 +599,9 @@ png_write_destroy(png_structp png_ptr)
|
||||
png_free(png_ptr, png_ptr->up_row);
|
||||
png_free(png_ptr, png_ptr->avg_row);
|
||||
png_free(png_ptr, png_ptr->paeth_row);
|
||||
#if defined(PNG_TIME_RFC1152_SUPPORTED)
|
||||
png_free(png_ptr, png_ptr->time_buffer);
|
||||
#endif /* PNG_TIME_RFC1152_SUPPORTED */
|
||||
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
|
||||
png_free(png_ptr, png_ptr->prev_filters);
|
||||
png_free(png_ptr, png_ptr->filter_weights);
|
||||
@ -683,7 +724,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
|
||||
* differences metric is relatively fast and effective, there is some
|
||||
* question as to whether it can be improved upon by trying to keep the
|
||||
* filtered data going to zlib more consistent, hopefully resulting in
|
||||
* better compression. */
|
||||
* better compression.
|
||||
*/
|
||||
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
|
||||
void
|
||||
png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
|
||||
|
||||
43
pngwtran.c
43
pngwtran.c
@ -1,18 +1,19 @@
|
||||
|
||||
/* pngwtran.c - transforms the data in a row for PNG writers
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
|
||||
/* transform the data according to the users wishes. The order of
|
||||
transformations is significant. */
|
||||
/* Transform the data according to the users wishes. The order of
|
||||
* transformations is significant.
|
||||
*/
|
||||
void
|
||||
png_do_write_transformations(png_structp png_ptr)
|
||||
{
|
||||
@ -51,9 +52,10 @@ png_do_write_transformations(png_structp png_ptr)
|
||||
}
|
||||
|
||||
#if defined(PNG_WRITE_PACK_SUPPORTED)
|
||||
/* pack pixels into bytes. Pass the true bit depth in bit_depth. The
|
||||
row_info bit depth should be 8 (one pixel per byte). The channels
|
||||
should be 1 (this only happens on grayscale and paletted images) */
|
||||
/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The
|
||||
* row_info bit depth should be 8 (one pixel per byte). The channels
|
||||
* should be 1 (this only happens on grayscale and paletted images).
|
||||
*/
|
||||
void
|
||||
png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
|
||||
{
|
||||
@ -169,12 +171,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
|
||||
#endif
|
||||
|
||||
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
|
||||
/* shift pixel values to take advantage of whole range. Pass the
|
||||
true number of bits in bit_depth. The row should be packed
|
||||
according to row_info->bit_depth. Thus, if you had a row of
|
||||
bit depth 4, but the pixels only had values from 0 to 7, you
|
||||
would pass 3 as bit_depth, and this routine would translate the
|
||||
data to 0 to 15. */
|
||||
/* Shift pixel values to take advantage of whole range. Pass the
|
||||
* true number of bits in bit_depth. The row should be packed
|
||||
* according to row_info->bit_depth. Thus, if you had a row of
|
||||
* bit depth 4, but the pixels only had values from 0 to 7, you
|
||||
* would pass 3 as bit_depth, and this routine would translate the
|
||||
* data to 0 to 15.
|
||||
*/
|
||||
void
|
||||
png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
|
||||
{
|
||||
@ -252,7 +255,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
|
||||
|
||||
for (bp = row, i = 0; i < row_info->width; i++)
|
||||
{
|
||||
int c;
|
||||
png_uint_32 c;
|
||||
|
||||
for (c = 0; c < channels; c++, bp++)
|
||||
{
|
||||
@ -278,7 +281,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
|
||||
|
||||
for (bp = row, i = 0; i < row_info->width * row_info->channels; i++)
|
||||
{
|
||||
int c;
|
||||
png_uint_32 c;
|
||||
|
||||
for (c = 0; c < channels; c++, bp += 2)
|
||||
{
|
||||
|
||||
128
pngwutil.c
128
pngwutil.c
@ -1,12 +1,12 @@
|
||||
|
||||
/* pngwutil.c - utilities to write a PNG file
|
||||
|
||||
libpng 1.0 beta 6 - version 0.96
|
||||
For conditions of distribution and use, see copyright notice in png.h
|
||||
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
Copyright (c) 1996, 1997 Andreas Dilger
|
||||
May 12, 1997
|
||||
*/
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
#include "png.h"
|
||||
@ -26,8 +26,9 @@ png_save_uint_32(png_bytep buf, png_uint_32 i)
|
||||
|
||||
#if defined(PNG_WRITE_pCAL_SUPPORTED)
|
||||
/* The png_save_int_32 function assumes integers are stored in two's
|
||||
complement format. If this isn't the case, then this routine needs to
|
||||
be modified to write data in two's complement format. */
|
||||
* complement format. If this isn't the case, then this routine needs to
|
||||
* be modified to write data in two's complement format.
|
||||
*/
|
||||
void
|
||||
png_save_int_32(png_bytep buf, png_int_32 i)
|
||||
{
|
||||
@ -38,22 +39,26 @@ png_save_int_32(png_bytep buf, png_int_32 i)
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Place a 16-bit number into a buffer in PNG byte order. */
|
||||
/* Place a 16-bit number into a buffer in PNG byte order.
|
||||
* The parameter is declared unsigned int, not png_uint_16,
|
||||
* just to avoid potential problems on pre-ANSI C compilers.
|
||||
*/
|
||||
void
|
||||
png_save_uint_16(png_bytep buf, png_uint_16 i)
|
||||
png_save_uint_16(png_bytep buf, unsigned int i)
|
||||
{
|
||||
buf[0] = (png_byte)((i >> 8) & 0xff);
|
||||
buf[1] = (png_byte)(i & 0xff);
|
||||
}
|
||||
|
||||
/* Write a PNG chunk all at once. The type is an array of ASCII characters
|
||||
representing the chunk name. The array must be at least 4 bytes in
|
||||
length, and does not need to be null terminated. To be safe, pass the
|
||||
pre-defined chunk names here, and if you need a new one, define it
|
||||
where the others are defined. The length is the length of the data.
|
||||
All the data must be present. If that is not possible, use the
|
||||
png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()
|
||||
functions instead. */
|
||||
* representing the chunk name. The array must be at least 4 bytes in
|
||||
* length, and does not need to be null terminated. To be safe, pass the
|
||||
* pre-defined chunk names here, and if you need a new one, define it
|
||||
* where the others are defined. The length is the length of the data.
|
||||
* All the data must be present. If that is not possible, use the
|
||||
* png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()
|
||||
* functions instead.
|
||||
*/
|
||||
void
|
||||
png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
|
||||
png_bytep data, png_size_t length)
|
||||
@ -64,8 +69,9 @@ png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
|
||||
}
|
||||
|
||||
/* Write the start of a PNG chunk. The type is the chunk type.
|
||||
The total_length is the sum of the lengths of all the data you will be
|
||||
passing in png_write_chunk_data() */
|
||||
* The total_length is the sum of the lengths of all the data you will be
|
||||
* passing in png_write_chunk_data().
|
||||
*/
|
||||
void
|
||||
png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
|
||||
png_uint_32 length)
|
||||
@ -85,9 +91,10 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
|
||||
}
|
||||
|
||||
/* Write the data of a PNG chunk started with png_write_chunk_start().
|
||||
Note that multiple calls to this function are allowed, and that the
|
||||
sum of the lengths from these calls *must* add up to the total_length
|
||||
given to png_write_chunk_start(). */
|
||||
* Note that multiple calls to this function are allowed, and that the
|
||||
* sum of the lengths from these calls *must* add up to the total_length
|
||||
* given to png_write_chunk_start().
|
||||
*/
|
||||
void
|
||||
png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
|
||||
{
|
||||
@ -106,11 +113,7 @@ png_write_chunk_end(png_structp png_ptr)
|
||||
png_byte buf[4];
|
||||
|
||||
/* write the crc */
|
||||
#ifdef PNG_USE_OWN_CRC
|
||||
png_save_uint_32(buf, ~png_ptr->crc);
|
||||
#else
|
||||
png_save_uint_32(buf, png_ptr->crc);
|
||||
#endif
|
||||
|
||||
png_write_data(png_ptr, buf, (png_size_t)4);
|
||||
}
|
||||
@ -119,7 +122,8 @@ png_write_chunk_end(png_structp png_ptr)
|
||||
* the magic bytes of the signature, or more likely, the PNG stream is
|
||||
* being embedded into another stream and doesn't need its own signature,
|
||||
* we should call png_set_sig_bytes() to tell libpng how many of the
|
||||
* bytes have already been written. */
|
||||
* bytes have already been written.
|
||||
*/
|
||||
void
|
||||
png_write_sig(png_structp png_ptr)
|
||||
{
|
||||
@ -129,8 +133,9 @@ png_write_sig(png_structp png_ptr)
|
||||
}
|
||||
|
||||
/* Write the IHDR chunk, and update the png_struct with the necessary
|
||||
information. Note that the rest of this code depends upon this
|
||||
information being correct. */
|
||||
* information. Note that the rest of this code depends upon this
|
||||
* information being correct.
|
||||
*/
|
||||
void
|
||||
png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
|
||||
int bit_depth, int color_type, int compression_type, int filter_type,
|
||||
@ -264,8 +269,9 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
|
||||
}
|
||||
|
||||
/* write the palette. We are careful not to trust png_color to be in the
|
||||
correct order for PNG, so people can redefine it to any convient
|
||||
structure. */
|
||||
* correct order for PNG, so people can redefine it to any convient
|
||||
* structure.
|
||||
*/
|
||||
void
|
||||
png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
|
||||
{
|
||||
@ -336,6 +342,22 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(PNG_WRITE_sRGB_SUPPORTED)
|
||||
/* write a sRGB chunk */
|
||||
void
|
||||
png_write_sRGB(png_structp png_ptr, png_byte srgb_intent)
|
||||
{
|
||||
png_byte buf[1];
|
||||
|
||||
png_debug(1, "in png_write_sRGB\n");
|
||||
if(srgb_intent > 3)
|
||||
png_warning(png_ptr,
|
||||
"Invalid sRGB rendering intent specified");
|
||||
buf[0]=srgb_intent;
|
||||
png_write_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(PNG_WRITE_sBIT_SUPPORTED)
|
||||
/* write the sBIT chunk */
|
||||
void
|
||||
@ -560,11 +582,10 @@ png_write_hIST(png_structp png_ptr, png_uint_16p hist, png_uint_32 num_hist)
|
||||
* static keywords without having to have duplicate copies of the strings.
|
||||
*/
|
||||
png_size_t
|
||||
png_check_keyword(png_structp png_ptr, png_charp key, png_bytepp new_key)
|
||||
png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
|
||||
{
|
||||
png_size_t key_len;
|
||||
png_charp kp;
|
||||
png_bytep dp;
|
||||
png_charp kp, dp;
|
||||
int kflag;
|
||||
|
||||
png_debug(1, "in png_check_keyword\n");
|
||||
@ -581,12 +602,12 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_bytepp new_key)
|
||||
|
||||
png_debug1(2, "Keyword to be checked is '%s'\n", key);
|
||||
|
||||
*new_key = (png_bytep)png_malloc(png_ptr, key_len + 1);
|
||||
*new_key = (png_charp)png_malloc(png_ptr, key_len + 1);
|
||||
|
||||
/* Replace non-printing characters with a blank and print a warning */
|
||||
for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
|
||||
{
|
||||
if (*kp < 0x20 || ((png_byte)*kp > 0x7E && (png_byte)*kp < 0xA1))
|
||||
if (*kp < 0x20 || (*kp > 0x7E && *kp < 0xA1))
|
||||
{
|
||||
char msg[40];
|
||||
|
||||
@ -688,7 +709,7 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
|
||||
png_size_t text_len)
|
||||
{
|
||||
png_size_t key_len;
|
||||
png_bytep new_key;
|
||||
png_charp new_key;
|
||||
|
||||
png_debug(1, "in png_write_tEXt\n");
|
||||
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
|
||||
@ -705,7 +726,7 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
|
||||
|
||||
/* make sure we include the 0 after the key */
|
||||
png_write_chunk_start(png_ptr, png_tEXt, (png_uint_32)key_len+text_len+1);
|
||||
png_write_chunk_data(png_ptr, new_key, key_len + 1);
|
||||
png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
|
||||
if (text_len)
|
||||
png_write_chunk_data(png_ptr, (png_bytep)text, text_len);
|
||||
|
||||
@ -722,7 +743,7 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
|
||||
{
|
||||
png_size_t key_len;
|
||||
char buf[1];
|
||||
png_bytep new_key;
|
||||
png_charp new_key;
|
||||
int i, ret;
|
||||
png_charpp output_ptr = NULL; /* array of pointers to output */
|
||||
int num_output_ptr = 0; /* number of output pointers used */
|
||||
@ -945,7 +966,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
|
||||
png_size_t purpose_len, units_len, total_len;
|
||||
png_uint_32p params_len;
|
||||
png_byte buf[10];
|
||||
png_bytep new_purpose;
|
||||
png_charp new_purpose;
|
||||
int i;
|
||||
|
||||
png_debug1(1, "in png_write_pCAL (%d parameters)\n", nparams);
|
||||
@ -971,7 +992,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
|
||||
|
||||
png_debug1(3, "pCAL total length = %d\n", total_len);
|
||||
png_write_chunk_start(png_ptr, png_pCAL, total_len);
|
||||
png_write_chunk_data(png_ptr, new_purpose, purpose_len);
|
||||
png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
|
||||
png_save_int_32(buf, X0);
|
||||
png_save_int_32(buf + 4, X1);
|
||||
buf[8] = (png_byte)type;
|
||||
@ -1013,8 +1034,9 @@ png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
|
||||
#endif
|
||||
|
||||
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
||||
/* write the tIME chunk. Use either png_convert_from_struct_tm()
|
||||
or png_convert_from_time_t(), or fill in the structure yourself */
|
||||
/* Write the tIME chunk. Use either png_convert_from_struct_tm()
|
||||
* or png_convert_from_time_t(), or fill in the structure yourself.
|
||||
*/
|
||||
void
|
||||
png_write_tIME(png_structp png_ptr, png_timep mod_time)
|
||||
{
|
||||
@ -1206,14 +1228,13 @@ png_write_finish_row(png_structp png_ptr)
|
||||
}
|
||||
|
||||
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
||||
/* pick out the correct pixels for the interlace pass.
|
||||
|
||||
The basic idea here is to go through the row with a source
|
||||
pointer and a destination pointer (sp and dp), and copy the
|
||||
correct pixels for the pass. As the row gets compacted,
|
||||
sp will always be >= dp, so we should never overwrite anything.
|
||||
See the default: case for the easiest code to understand.
|
||||
*/
|
||||
/* Pick out the correct pixels for the interlace pass.
|
||||
* The basic idea here is to go through the row with a source
|
||||
* pointer and a destination pointer (sp and dp), and copy the
|
||||
* correct pixels for the pass. As the row gets compacted,
|
||||
* sp will always be >= dp, so we should never overwrite anything.
|
||||
* See the default: case for the easiest code to understand.
|
||||
*/
|
||||
void
|
||||
png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
|
||||
{
|
||||
@ -1366,7 +1387,8 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
|
||||
|
||||
/* This filters the row, chooses which filter to use, if it has not already
|
||||
* been specified by the application, and then writes the row out with the
|
||||
* chosen filter. */
|
||||
* chosen filter.
|
||||
*/
|
||||
#define PNG_MAXSUM (~0x0UL >> 1)
|
||||
#define PNG_HISHIFT 10
|
||||
#define PNG_LOMASK 0xffffL
|
||||
|
||||
Reference in New Issue
Block a user