/* png.h - header file for PNG reference library * * libpng 1.0.1d * For conditions of distribution and use, see the COPYRIGHT NOTICE below. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1998 Glenn Randers-Pehrson * May 21, 1998 * * Note about libpng version numbers: * * Due to various miscommunications, unforeseen code incompatibilities * and occasional factors outside the authors' control, version numbering * on the library has not always been consistent and straightforward. * The following table summarizes matters since version 0.89c, which was * the first widely used release: * * source png.h png.h shared-lib * version string int version * ------- ------ ----- ---------- * 0.89c ("1.0 beta 3") 0.89 89 1.0.89 * 0.90 ("1.0 beta 4") 0.90 90 0.90 [should have been 2.0.90] * 0.95 ("1.0 beta 5") 0.95 95 0.95 [should have been 2.0.95] * 0.96 ("1.0 beta 6") 0.96 96 0.96 [should have been 2.0.96] * 0.97b ("1.00.97 beta 7") 1.00.97 97 1.0.1 [should have been 2.0.97] * 0.97c 0.97 97 2.0.97 * 0.98 0.98 98 2.0.98 * 0.99 0.99 98 2.0.99 * 0.99a-m 0.99 99 2.0.99 * 1.00 1.00 100 2.1.0 [int should be 10000] * 1.0.0 1.0.0 100 2.1.0 [int should be 10000] * 1.0.1 1.0.1 10001 2.1.0 * 1.0.1a 1.0.1a 10002 2.1.0.1a * 1.0.1b 1.0.1b 10002 2.1.0.1b * 1.0.1c 1.0.1c 10002 2.1.0.1c * * Henceforth the source version will match the shared-library minor * and patch numbers; the shared-library major version number will be * used for changes in backward compatibility, as it is intended. The * PNG_PNGLIB_VER macro, which is not used within libpng but is available * for applications, is an unsigned integer of the form xyyzz corresponding * to the source version x.y.z (leading zeros in y and z). * * See libpng.txt or libpng.3 for more information. The PNG specification * is available as RFC 2083 * and as a W3C Recommendation * * Contributing Authors: * John Bowler * Kevin Bracey * Sam Bushell * Andreas Dilger * Magnus Holmgren * Tom Lane * Dave Martindale * Glenn Randers-Pehrson * Greg Roelofs * Guy Eric Schalnat * Paul Schmidt * Tom Tanner * Willem van Schaik * 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. * * COPYRIGHT NOTICE: * * 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 #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ /* This is not the place to learn how to use libpng. The file libpng.txt * describes how to use libpng, and the file example.c summarizes it * with some code on which to build. This file is useful for looking * at the actual function definitions and structure components. */ /* include the compression library's header */ #include "zlib.h" /* include all user configurable info */ #include "pngconf.h" /* This file is arranged in several sections. The first section contains * structure and type definitions. The second section contains the external * library functions, while the third has the internal library functions, * which applications aren't expected to use directly. */ /* Version information for png.h - this should match the version in png.c */ #define PNG_LIBPNG_VER_STRING "1.0.1d" /* Careful here. At one time, Guy wanted to use 082, but that would be octal. * We must not include leading zeros. * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only * version 1.0.0 was mis-numbered 100 instead of 10000). From * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=bugfix */ #define PNG_LIBPNG_VER 10002 /* 1.0.2 */ /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) /* Version information for C files, stored in png.c. This had better match * the version above. */ extern char png_libpng_ver[12]; /* need room for 99.99.99aa */ /* Structures to facilitate easy interlacing. See png.c for more details */ extern int FARDATA png_pass_start[7]; extern int FARDATA png_pass_inc[7]; extern int FARDATA png_pass_ystart[7]; extern int FARDATA png_pass_yinc[7]; extern int FARDATA png_pass_mask[7]; extern int FARDATA png_pass_dsp_mask[7]; /* These aren't currently used. If you need them, see png.c for more details extern int FARDATA png_pass_width[7]; extern int FARDATA png_pass_height[7]; */ #endif /* PNG_NO_EXTERN */ /* Three color definitions. The order of the red, green, and blue, (and the * exact size) is not important, although the size of the fields need to * be png_byte or png_uint_16 (as defined below). */ typedef struct png_color_struct { png_byte red; png_byte green; png_byte blue; } png_color; typedef png_color FAR * png_colorp; typedef png_color FAR * FAR * png_colorpp; typedef struct png_color_16_struct { png_byte index; /* used for palette files */ png_uint_16 red; /* for use in red green blue files */ png_uint_16 green; png_uint_16 blue; png_uint_16 gray; /* for use in grayscale files */ } png_color_16; typedef png_color_16 FAR * png_color_16p; typedef png_color_16 FAR * FAR * png_color_16pp; typedef struct png_color_8_struct { png_byte red; /* for use in red green blue files */ png_byte green; png_byte blue; png_byte gray; /* for use in grayscale files */ png_byte alpha; /* for alpha channel files */ } png_color_8; typedef png_color_8 FAR * png_color_8p; typedef png_color_8 FAR * FAR * png_color_8pp; /* png_text holds the text in a PNG file, and whether they are compressed in the PNG file or not. The "text" field points to a regular C string. */ typedef struct png_text_struct { int compression; /* compression value, see PNG_TEXT_COMPRESSION_ */ png_charp key; /* keyword, 1-79 character description of "text" */ png_charp text; /* comment, may be an empty string (ie "") */ png_size_t text_length; /* length of "text" field */ } png_text; typedef png_text FAR * png_textp; typedef png_text FAR * FAR * png_textpp; /* Supported compression types for text in PNG files (tEXt, and zTXt). * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ #define PNG_TEXT_COMPRESSION_NONE_WR -3 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 #define PNG_TEXT_COMPRESSION_NONE -1 #define PNG_TEXT_COMPRESSION_zTXt 0 #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! */ typedef struct png_time_struct { png_uint_16 year; /* full year, as in, 1995 */ png_byte month; /* month of year, 1 - 12 */ png_byte day; /* day of month, 1 - 31 */ png_byte hour; /* hour of day, 0 - 23 */ png_byte minute; /* minute of hour, 0 - 59 */ png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ } png_time; typedef png_time FAR * png_timep; typedef png_time FAR * FAR * png_timepp; /* png_info is a structure that holds the information in a PNG file so * that the application can find out the characteristics of the image. * If you are reading the file, this structure will tell you what is * in the PNG file. If you are writing the file, fill in the information * you want to put into the PNG file, then call png_write_info(). * The names chosen should be very close to the PNG specification, so * consult that document for information about the meaning of each field. * * With libpng < 0.95, it was only possible to directly set and read the * the values in the png_info_struct, which meant that the contents and * order of the values had to remain fixed. With libpng 0.95 and later, * however, there are now functions that abstract the contents of * png_info_struct from the application, so this makes it easier to use * libpng with dynamic libraries, and even makes it possible to use * libraries that don't have all of the libpng ancillary chunk-handing * functionality. * * In any case, the order of the parameters in png_info_struct should NOT * be changed for as long as possible to keep compatibility with applications * that use the old direct-access method with png_info_struct. */ typedef struct png_info_struct { /* the following are necessary for every PNG file */ png_uint_32 width; /* width of image in pixels (from IHDR) */ png_uint_32 height; /* height of image in pixels (from IHDR) */ png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ /* The following is informational only on read, and not used on writes. */ png_byte channels; /* number of data channels per pixel (1, 3, 4)*/ png_byte pixel_depth; /* number of bits per pixel */ png_byte spare_byte; /* to align the data, and for future use */ png_byte signature[8]; /* magic bytes read by libpng from start of file */ /* The rest of the data is optional. If you are reading, check the * valid field to see if the information in these are valid. If you * are writing, set the valid field to those chunks you want written, * and initialize the appropriate fields below. */ #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) || \ defined(PNG_READ_GAMMA_SUPPORTED) /* The gAMA chunk describes the gamma characteristics of the system * on which the image was created, normally in the range [1.0, 2.5]. * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. */ 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 * uncompressed and compressed forms, respectively. The data in "text" * is an array of pointers to uncompressed, null-terminated C strings. * Each chunk has a keyword that describes the textual data contained * in that chunk. Keywords are not required to be unique, and the text * string may be empty. Any number of text chunks may be in an image. */ int num_text; /* number of comments read/to write */ int max_text; /* current size of text array */ png_textp text; /* array of comments read/to write */ #endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */ #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED) /* The tIME chunk holds the last time the displayed image data was * modified. See the png_time struct for the contents of this struct. */ png_time mod_time; #endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */ #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED) /* The sBIT chunk specifies the number of significant high-order bits * in the pixel data. Values are in the range [1, bit_depth], and are * only specified for the channels in the pixel data. The contents of * the low-order bits is not specified. Data is valid if * (valid & PNG_INFO_sBIT) is non-zero. */ png_color_8 sig_bit; /* significant bits in color channels */ #endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */ #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) /* The tRNS chunk supplies transparency data for paletted images and * other image types that don't need a full alpha channel. There are * "num_trans" transparency values for a paletted image, stored in the * same order as the palette colors, starting from index 0. Values * for the data are in the range [0, 255], ranging from fully transparent * to fully opaque, respectively. For non-paletted images, there is a * single color specified that should be treated as fully transparent. * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. */ png_bytep trans; /* transparent values for paletted image */ png_color_16 trans_values; /* transparent color for non-palette image */ #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */ #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) || \ defined(PNG_READ_BACKGROUND_SUPPORTED) /* The bKGD chunk gives the suggested image background color if the * display program does not have its own background color and the image * is needs to composited onto a background before display. The colors * in "background" are normally in the same color space/depth as the * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. */ png_color_16 background; #endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */ #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards * and downwards from the top-left corner of the display, page, or other * application-specific co-ordinate space. See the PNG_OFFSET_ defines * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. */ png_uint_32 x_offset; /* x offset on page */ png_uint_32 y_offset; /* y offset on page */ png_byte offset_unit_type; /* offset units type */ #endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */ #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) /* The pHYs chunk gives the physical pixel density of the image for * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. */ png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ png_uint_32 y_pixels_per_unit; /* vertical pixel density */ png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ #endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */ #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED) /* The hIST chunk contains the relative frequency or importance of the * various palette entries, so that a viewer can intelligently select a * reduced-color palette, if required. Data is an array of "num_palette" * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) * is non-zero. */ png_uint_16p hist; #endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */ #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED) /* The cHRM chunk describes the CIE color characteristics of the monitor * on which the PNG was created. This data allows the viewer to do gamut * mapping of the input image to ensure that the viewer sees the same * colors in the image as the creator. Values are in the range * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. */ float x_white; float y_white; float x_red; float y_red; float x_green; float y_green; float x_blue; float y_blue; #endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */ #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) /* The pCAL chunk describes a transformation between the stored pixel * values and original physcical data values used to create the image. * The integer range [0, 2^bit_depth - 1] maps to the floating-point * range given by [pcal_X0, pcal_X1], and are further transformed by a * (possibly non-linear) transformation function given by "pcal_type" * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ * defines below, and the PNG-Group's Scientific Visualization extension * chunks document png-scivis-19970203 for a complete description of the * transformations and how they should be implemented, as well as the * png-extensions document for a description of the ASCII parameter * strings. Data values are valid if (valid & PNG_INFO_pCAL) non-zero. */ png_charp pcal_purpose; /* pCAL chunk description string */ png_int_32 pcal_X0; /* minimum value */ png_int_32 pcal_X1; /* maximum value */ png_charp pcal_units; /* Latin-1 string giving physical units */ png_charpp pcal_params; /* ASCII strings containing parameter values */ png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ png_byte pcal_nparams; /* number of parameters given in pcal_params */ #endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */ } png_info; typedef png_info FAR * png_infop; typedef png_info FAR * FAR * png_infopp; /* These describe the color_type field in png_info. */ /* color type masks */ #define PNG_COLOR_MASK_PALETTE 1 #define PNG_COLOR_MASK_COLOR 2 #define PNG_COLOR_MASK_ALPHA 4 /* color types. Note that not all combinations are legal */ #define PNG_COLOR_TYPE_GRAY 0 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) /* This is for compression type. PNG 1.0 only defines the single type. */ #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE /* This is for filter type. PNG 1.0 only defines the single type. */ #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE /* These are for the interlacing type. These values should NOT be changed. */ #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ #define PNG_INTERLACE_LAST 2 /* Not a valid value */ /* These are for the oFFs chunk. These values should NOT be changed. */ #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ #define PNG_OFFSET_LAST 2 /* Not a valid value */ /* These are for the pCAL chunk. These values should NOT be changed. */ #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ #define PNG_EQUATION_LAST 4 /* Not a valid value */ /* These are for the pHYs chunk. These values should NOT be changed. */ #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ #define PNG_RESOLUTION_METER 1 /* pixels/meter */ #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ /* These are for the sRGB chunk. These values should NOT be changed. */ #define PNG_sRGB_INTENT_SATURATION 0 #define PNG_sRGB_INTENT_PERCEPTUAL 1 #define PNG_sRGB_INTENT_ABSOLUTE 2 #define PNG_sRGB_INTENT_RELATIVE 3 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ /* These determine if an ancillary chunk's data has been successfully read * from the PNG header, or if the application has filled in the corresponding * data in the info_struct to be written into the output file. The values * of the PNG_INFO_ defines should NOT be changed. */ #define PNG_INFO_gAMA 0x0001 #define PNG_INFO_sBIT 0x0002 #define PNG_INFO_cHRM 0x0004 #define PNG_INFO_PLTE 0x0008 #define PNG_INFO_tRNS 0x0010 #define PNG_INFO_bKGD 0x0020 #define PNG_INFO_hIST 0x0040 #define PNG_INFO_pHYs 0x0080 #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 * the routines for other purposes. */ typedef struct png_row_info_struct { png_uint_32 width; /* width of row */ png_uint_32 rowbytes; /* number of bytes in row */ png_byte color_type; /* color type of row */ png_byte bit_depth; /* bit depth of row */ png_byte channels; /* number of channels (1, 2, 3, or 4) */ png_byte pixel_depth; /* bits per pixel (depth * channels) */ } png_row_info; typedef png_row_info FAR * png_row_infop; typedef png_row_info FAR * FAR * png_row_infopp; /* These are the function types for the I/O functions and for the functions * that allow the user to override the default I/O functions with his or her * own. The png_error_ptr type should match that of user-supplied warning * and error functions, while the png_rw_ptr type should match that of the * user read/write data functions. */ typedef struct png_struct_def png_struct; typedef png_struct FAR * png_structp; typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp)); typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); typedef void (*png_flush_ptr) PNGARG((png_structp)); typedef void (*png_read_status_ptr) PNGARG((png_structp, png_uint_32, int)); typedef void (*png_write_status_ptr) PNGARG((png_structp, png_uint_32, int)); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop)); typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop)); typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep, png_uint_32, int)); #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) typedef void (*png_user_transform_ptr) PNGARG((png_structp, png_row_infop, png_bytep)); #endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */ /* The structure that holds the information to read and write PNG files. * The only people who need to care about what is inside of this are the * people who will be modifying the library for their own special needs. * It should NOT be accessed directly by an application, except to store * the jmp_buf. */ struct png_struct_def { jmp_buf jmpbuf; /* used in png_error */ png_error_ptr error_fn; /* function for printing errors and aborting */ png_error_ptr warning_fn; /* function for printing warnings */ png_voidp error_ptr; /* user supplied struct for error functions */ png_rw_ptr write_data_fn; /* function for writing output data */ png_rw_ptr read_data_fn; /* function for reading input data */ #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) png_user_transform_ptr read_user_transform_fn; /* user read transform */ png_user_transform_ptr write_user_transform_fn; /* user write transform */ #endif png_voidp io_ptr; /* ptr to application struct for I/O functions*/ png_uint_32 mode; /* tells us where we are in the PNG file */ png_uint_32 flags; /* flags indicating various things to libpng */ png_uint_32 transformations; /* which transformations to perform */ z_stream zstream; /* pointer to decompression structure (below) */ png_bytep zbuf; /* buffer for zlib */ png_size_t zbuf_size; /* size of zbuf */ int zlib_level; /* holds zlib compression level */ int zlib_method; /* holds zlib compression method */ int zlib_window_bits; /* holds zlib compression window bits */ int zlib_mem_level; /* holds zlib compression memory level */ int zlib_strategy; /* holds zlib compression strategy */ png_uint_32 width; /* width of image in pixels */ png_uint_32 height; /* height of image in pixels */ png_uint_32 num_rows; /* number of rows in current pass */ png_uint_32 usr_width; /* width of row at start of write */ png_uint_32 rowbytes; /* size of row in bytes */ png_uint_32 irowbytes; /* size of current interlaced row in bytes */ png_uint_32 iwidth; /* width of current interlaced row in pixels */ png_uint_32 row_number; /* current row in interlace pass */ png_bytep prev_row; /* buffer to save previous (unfiltered) row */ png_bytep row_buf; /* buffer to save current (unfiltered) row */ png_bytep sub_row; /* buffer to save "sub" row when filtering */ png_bytep up_row; /* buffer to save "up" row when filtering */ png_bytep avg_row; /* buffer to save "avg" row when filtering */ png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ png_row_info row_info; /* used for transformation routines */ png_uint_32 idat_size; /* current IDAT size for read */ png_uint_32 crc; /* current chunk CRC value */ png_colorp palette; /* palette from the input file */ png_uint_16 num_palette; /* number of color entries in palette */ png_uint_16 num_trans; /* number of transparency values */ png_byte chunk_name[5]; /* null-terminated name of current chunk */ png_byte compression; /* file compression type (always 0) */ png_byte filter; /* file filter type (always 0) */ png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ png_byte pass; /* current interlace pass (0 - 6) */ png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ png_byte color_type; /* color type of file */ png_byte bit_depth; /* bit depth of file */ png_byte usr_bit_depth; /* bit depth of users row */ png_byte pixel_depth; /* number of bits per pixel */ png_byte channels; /* number of channels in file */ 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_uint_16 filler; /* filler bytes for pixel expansion */ #endif /* PNG_READ_FILLER_SUPPORTED */ #if defined(PNG_READ_bKGD_SUPPORTED) png_byte background_gamma_type; float background_gamma; png_color_16 background; /* background color in screen gamma space */ #if defined(PNG_READ_GAMMA_SUPPORTED) png_color_16 background_1; /* background normalized to gamma 1.0 */ #endif /* PNG_READ_GAMMA && PNG_READ_bKGD_SUPPORTED */ #endif /* PNG_READ_bKGD_SUPPORTED */ #if defined(PNG_WRITE_FLUSH_SUPPORTED) png_flush_ptr output_flush_fn;/* Function for flushing output */ png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ png_uint_32 flush_rows; /* number of rows written since last flush */ #endif /* PNG_WRITE_FLUSH_SUPPORTED */ #if defined(PNG_READ_GAMMA_SUPPORTED) int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ float gamma; /* file gamma value */ float screen_gamma; /* screen gamma value (display_gamma/viewing_gamma */ #endif /* PNG_READ_GAMMA_SUPPORTED */ #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) png_bytep gamma_table; /* gamma table for 8 bit depth files */ png_bytep gamma_from_1; /* converts from 1.0 to screen */ png_bytep gamma_to_1; /* converts from file to 1.0 */ png_uint_16pp gamma_16_table; /* gamma table for 16 bit depth files */ png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ #endif /* PNG_READ_GAMMA_SUPPORTED || PNG_WRITE_GAMMA_SUPPORTED */ #if defined(PNG_READ_GAMMA_SUPPORTED) || defined (PNG_READ_sBIT_SUPPORTED) png_color_8 sig_bit; /* significant bits in each available channel */ #endif /* PNG_READ_GAMMA_SUPPORTED || PNG_READ_sBIT_SUPPORTED */ #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) png_color_8 shift; /* shift for significant bit tranformation */ #endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */ #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) png_bytep trans; /* transparency values for paletted files */ png_color_16 trans_values; /* transparency values for non-paletted files */ #endif /* PNG_READ_tRNS_SUPPORTED || PNG_READ_BACKGROUND_SUPPORTED */ png_read_status_ptr read_row_fn; /* called after each row is decoded */ png_write_status_ptr write_row_fn; /* called after each row is encoded */ #ifdef PNG_PROGRESSIVE_READ_SUPPORTED png_progressive_info_ptr info_fn; /* called after header data fully read */ png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ png_progressive_end_ptr end_fn; /* called after image is complete */ png_bytep save_buffer_ptr; /* current location in save_buffer */ png_bytep save_buffer; /* buffer for previously read data */ png_bytep current_buffer_ptr; /* current location in current_buffer */ png_bytep current_buffer; /* buffer for recently used data */ png_uint_32 push_length; /* size of current input chunk */ png_uint_32 skip_length; /* bytes to skip in input data */ png_size_t save_buffer_size; /* amount of data now in save_buffer */ png_size_t save_buffer_max; /* total size of save_buffer */ png_size_t buffer_size; /* total amount of available input data */ png_size_t current_buffer_size; /* amount of data now in current_buffer */ int process_mode; /* what push library is currently doing */ int cur_palette; /* current push library palette index */ #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) png_size_t current_text_size; /* current size of text input data */ png_size_t current_text_left; /* how much text left to read in input */ png_charp current_text; /* current text chunk buffer */ png_charp current_text_ptr; /* current location in current_text */ #endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_READ_tEXt/zTXt_SUPPORTED */ #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) /* for the Borland special 64K segment handler */ png_bytepp offset_table_ptr; png_bytep offset_table; png_uint_16 offset_table_number; png_uint_16 offset_table_count; png_uint_16 offset_table_count_free; #endif /* __TURBOC__&&!_Windows&&!__FLAT__ */ #if defined(PNG_READ_DITHER_SUPPORTED) png_bytep palette_lookup; /* lookup table for dithering */ png_bytep dither_index; /* index translation for palette files */ #endif /* PNG_READ_DITHER_SUPPORTED */ #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_READ_hIST_SUPPORTED) png_uint_16p hist; /* histogram */ #endif #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) png_byte heuristic_method; /* heuristic for row filter selection */ png_byte num_prev_filters; /* number of weights for previous rows */ png_bytep prev_filters; /* filter type(s) of previous row(s) */ png_uint_16p filter_weights; /* weight(s) for previous line(s) */ png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 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_RFC1123_SUPPORTED) png_charp time_buffer; /* String to hold RFC 1123 time text */ #endif /* PNG_TIME_RFC1123_SUPPORTED */ }; typedef png_struct FAR * FAR * png_structpp; /* Here are the function definitions most commonly used. This is not * the place to find out how to use libpng. See libpng.txt for the * full explanation, see example.c for the summary. This just provides * a simple one line of the use of each function. */ /* Tell lib we have already handled the first magic bytes. * Handling more than 8 bytes from the beginning of the file is an error. */ extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, int num_bytes)); /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a * PNG file. Returns zero if the supplied bytes match the 8-byte PNG * signature, and non-zero otherwise. Having num_to_check == 0 or * start > 7 will always fail (ie return non-zero). */ extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, png_size_t num_to_check)); /* Simple signature checking function. This is the same as calling * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). */ 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_const_charp user_png_ver, png_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) PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn)); /* Write a PNG chunk - size, type, (optional) data, CRC. */ extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, png_bytep chunk_name, png_bytep data, png_size_t length)); /* Write the start of a PNG chunk - length and chunk name. */ extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, png_bytep chunk_name, png_uint_32 length)); /* Write the data of a PNG chunk started with png_write_chunk_start(). */ extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, png_bytep data, png_size_t length)); /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); /* Allocate and initialize the info structure */ extern PNG_EXPORT(png_infop,png_create_info_struct) PNGARG((png_structp png_ptr)); /* Initialize the info structure (old interface - NOT DLL EXPORTED) */ extern void png_info_init PNGARG((png_infop info_ptr)); /* Writes all the PNG information before the image. */ extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* read the information before the actual image data. */ extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, png_infop info_ptr)); #if defined(PNG_TIME_RFC1123_SUPPORTED) extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) PNGARG((png_structp png_ptr, png_timep ptime)); #endif /* PNG_TIME_RFC1123_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, struct tm FAR * ttime)); /* convert from time_t to png_time. Uses gmtime() */ extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, time_t ttime)); #endif /* PNG_WRITE_tIME_SUPPORTED */ #if defined(PNG_READ_EXPAND_SUPPORTED) /* Expand data to 24 bit RGB, or 8 bit grayscale, with alpha if available. */ extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_EXPAND_SUPPORTED */ #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* Use blue, green, red order for pixels. */ extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_BGR_SUPPORTED || PNG_WRITE_BGR_SUPPORTED */ #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) /* Expand the grayscale to 24 bit RGB if necessary. */ extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */ #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) /* Reduce RGB to grayscale. (Not yet implemented) */ extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */ extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, png_colorp palette)); #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_STRIP_ALPHA_SUPPORTED */ #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED */ #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_INVERT_ALPHA_SUPPORTED || PNG_WRITE_INVERT_ALPHA_SUPPORTED */ #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) /* Add a filler byte to 24-bit RGB images. */ extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, png_uint_32 filler, int flags)); /* The values of the PNG_FILLER_ defines should NOT be changed */ #define PNG_FILLER_BEFORE 0 #define PNG_FILLER_AFTER 1 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) /* Swap bytes in 16 bit depth files. */ extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_SWAP_SUPPORTED || PNG_WRITE_SWAP_SUPPORTED */ #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) /* Use 1 byte per pixel in 1, 2, or 4 bit depth files. */ extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED */ #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) /* Swap packing order of pixels in bytes. */ extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPOR */ #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) /* Converts files to legal bit depths. */ extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, png_color_8p true_bits)); #endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */ #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ defined(PNG_WRITE_INTERLACING_SUPPORTED) /* Have the code handle the interlacing. Returns the number of passes. */ extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_INTERLACING_SUPPORTED || PNG_WRITE_INTERLACING_SUPPORTED */ #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) /* Invert monocrome files */ extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_INVERT_SUPPORTED || PNG_WRITE_INVERT_SUPPORTED */ #if defined(PNG_READ_BACKGROUND_SUPPORTED) /* Handle alpha and tRNS by replacing with a background color. */ extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, png_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma)); #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 #define PNG_BACKGROUND_GAMMA_SCREEN 1 #define PNG_BACKGROUND_GAMMA_FILE 2 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 #endif /* PNG_READ_BACKGROUND_SUPPORTED */ #if defined(PNG_READ_16_TO_8_SUPPORTED) /* strip the second byte of information from a 16 bit depth file. */ extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); #endif /* PNG_READ_16_TO_8_SUPPORTED */ #if defined(PNG_READ_DITHER_SUPPORTED) /* Turn on dithering, and reduce the palette to the number of colors available. */ extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, png_colorp palette, int num_palette, int maximum_colors, png_uint_16p histogram, int full_dither)); #endif /* PNG_READ_DITHER_SUPPORTED */ #if defined(PNG_READ_GAMMA_SUPPORTED) /* Handle gamma correction. Screen_gamma=(display_gamma/viewing_gamma) */ extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, double screen_gamma, double default_file_gamma)); #endif /* PNG_READ_GAMMA_SUPPORTED */ #if defined(PNG_WRITE_FLUSH_SUPPORTED) /* Set how many lines between output flushes - 0 for no flushing */ extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); /* Flush the current PNG output buffer */ extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); #endif /* PNG_WRITE_FLUSH_SUPPORTED */ /* optional update palette with requested transformations */ extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); /* optional call to update the users info structure */ extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* read a one or more rows of image data.*/ extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); /* read a row of data.*/ extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, png_bytep row, png_bytep display_row)); /* read the whole image into memory at once. */ extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, png_bytepp image)); /* write a row of image data */ extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, png_bytep row)); /* write a few rows of image data */ extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, png_bytepp row, png_uint_32 num_rows)); /* write the image data */ extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, png_bytepp image)); /* writes the end of the PNG file. */ extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* read the end of the PNG file. */ extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* free any memory associated with the png_info_struct */ extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, png_infopp info_ptr_ptr)); /* free any memory associated with the png_struct and the png_info_structs */ extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); /* free all memory used by the read (old method - NOT DLL EXPORTED) */ extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)); /* free any memory associated with the png_struct and the png_info_structs */ 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)); /* set the libpng method of handling chunk CRC errors */ extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, int crit_action, int ancil_action)); /* Values for png_set_crc_action() to say how to handle CRC errors in * ancillary and critical chunks, and whether to use the data contained * therein. Note that it is impossible to "discard" data in a critical * chunk. For versions prior to 0.90, the action was always error/quit, * whereas in version 0.90 and later, the action for CRC errors in ancillary * chunks is warn/discard. These values should NOT be changed. * * value action:critical action:ancillary */ #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ /* These functions give the user control over the scan-line filtering in * libpng and the compression methods used by zlib. These functions are * 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. */ /* set the filtering method(s) used by libpng. Currently, the only valid * value for "method" is 0. */ extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, int filters)); /* Flags for png_set_filter() to say which filters to use. The flags * are chosen so that they don't conflict with real filter types * below, in case they are supplied instead of the #defined constants. * These values should NOT be changed. */ #define PNG_NO_FILTERS 0x00 #define PNG_FILTER_NONE 0x08 #define PNG_FILTER_SUB 0x10 #define PNG_FILTER_UP 0x20 #define PNG_FILTER_AVG 0x40 #define PNG_FILTER_PAETH 0x80 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ PNG_FILTER_AVG | PNG_FILTER_PAETH) /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. * These defines should NOT be changed. */ #define PNG_FILTER_VALUE_NONE 0 #define PNG_FILTER_VALUE_SUB 1 #define PNG_FILTER_VALUE_UP 2 #define PNG_FILTER_VALUE_AVG 3 #define PNG_FILTER_VALUE_PAETH 4 #define PNG_FILTER_VALUE_LAST 5 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ * defines, either the default (minimum-sum-of-absolute-differences), or * the experimental method (weighted-minimum-sum-of-absolute-differences). * * Weights are factors >= 1.0, indicating how important it is to keep the * filter type consistent between rows. Larger numbers mean the current * filter is that many times as likely to be the same as the "num_weights" * previous filters. This is cumulative for each previous row with a weight. * There needs to be "num_weights" values in "filter_weights", or it can be * NULL if the weights aren't being specified. Weights have no influence on * the selection of the first row filter. Well chosen weights can (in theory) * improve the compression for a given image. * * Costs are factors >= 1.0 indicating the relative decoding costs of a * filter type. Higher costs indicate more decoding expense, and are * therefore less likely to be selected over a filter with lower computational * costs. There needs to be a value in "filter_costs" for each valid filter * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't * setting the costs. Costs try to improve the speed of decompression without * unduly increasing the compressed image size. * * A negative weight or cost indicates the default value is to be used, and * values in the range [0.0, 1.0) indicate the value is to remain unchanged. * The default values for both weights and costs are currently 1.0, but may * change if good general weighting/cost heuristics can be found. If both * the weights and costs are set to 1.0, this degenerates the WEIGHTED method * to the UNWEIGHTED method, but with added encoding time/computation. */ extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, int heuristic_method, int num_weights, png_doublep filter_weights, png_doublep filter_costs)); #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ /* Heuristic used for row filter selection. These defines should NOT be * changed. */ #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ /* Set the library compression level. Currently, valid values range from * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 * (0 - no compression, 9 - "maximal" compression). Note that tests have * shown that zlib compression levels 3-6 usually perform as well as level 9 * for PNG images, and do considerably fewer caclulations. In the future, * these values may not correspond directly to the zlib compression levels. */ extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, int level)); extern PNG_EXPORT(void,png_set_compression_mem_level) PNGARG((png_structp png_ptr, int mem_level)); extern PNG_EXPORT(void,png_set_compression_strategy) PNGARG((png_structp png_ptr, int strategy)); extern PNG_EXPORT(void,png_set_compression_window_bits) PNGARG((png_structp png_ptr, int window_bits)); extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, int method)); /* These next functions are called for input/output, memory, and error * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, * and call standard C I/O routines such as fread(), fwrite(), and * fprintf(). These functions can be made to use other I/O routines * at run time for those applications that need to handle I/O in a * different manner by calling png_set_???_fn(). See libpng.txt for * more information. */ #if !defined(PNG_NO_STDIO) /* Initialize the input/output for the PNG file to the default functions. */ extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp)); #endif /* Replace the (error and abort), and warning functions with user * supplied functions. If no messages are to be printed you must still * write and use replacement functions. The replacement error_fn should * still do a longjmp to the last setjmp location if you are using this * method of error handling. If error_fn or warning_fn is NULL, the * default function will be used. */ extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); /* Return the user pointer associated with the error functions */ extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); /* Replace the default data output functions with a user supplied one(s). * If buffered output is not used, then output_flush_fn can be set to NULL. * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time * output_flush_fn will be ignored (and thus can be NULL). */ extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); /* Replace the default data input function with a user supplied one. */ extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn)); /* Return the user pointer associated with the I/O functions */ extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, png_read_status_ptr read_row_fn)); extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, png_write_status_ptr write_row_fn)); #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp png_ptr, png_user_transform_ptr read_user_transform_fn)); #endif #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp png_ptr, png_user_transform_ptr write_user_transform_fn)); #endif #ifdef PNG_PROGRESSIVE_READ_SUPPORTED /* Sets the function callbacks for the push reader, and a pointer to a * user-defined structure available to the callback functions. */ extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, png_voidp progressive_ptr, png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); /* returns the user pointer associated with the push read functions */ extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) PNGARG((png_structp png_ptr)); /* function to be called when data becomes available */ extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); /* function that combines rows. Not very much different than the * png_combine_row() call. Is this even used????? */ extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, png_bytep old_row, png_bytep new_row)); #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, png_uint_32 size)); /* frees a pointer allocated by png_malloc() */ extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, png_voidp s1, png_voidp s2, png_uint_32 size)); extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, png_voidp s1, int value, png_uint_32 size)); #ifdef PNGTEST_MEMORY_DEBUG /* debugging versions of png_malloc() and png_free() */ extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr, png_uint_32 size)); extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr, png_voidp ptr)); #endif #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, int check)); #endif /* USE_FAR_KEYWORD */ /* Fatal error in PNG image of libpng - can't continue */ extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, png_const_charp error)); /* The same, but the chunk name is prepended to the error string. */ extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, png_const_charp error)); /* Non-fatal error in libpng. Can continue, but may have a problem. */ extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, png_const_charp message)); /* Non-fatal error in libpng, chunk name is prepended to message. */ extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, png_const_charp message)); /* The png_set_ functions are for storing values in the png_info_struct. * Similarly, the png_get_ calls are used to read values from the * png_info_struct, either storing the parameters in the passed variables, or * setting pointers into the png_info_struct where the data is stored. The * png_get_ functions return a non-zero value if the data was available * in info_ptr, or return zero and do not change any of the parameters if the * data was not available. * * These functions should be used instead of directly accessing png_info * to avoid problems with future changes in the size and internal layout of * png_info_struct. */ /* Returns "flag" if chunk data is valid in info_ptr. */ extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)); /* Returns number of bytes needed to hold a transformed row. */ extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns number of color channels in image. */ extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, png_infop info_ptr)); #ifdef PNG_EASY_ACCESS_SUPPORTED /* Returns image width in pixels. */ extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image height in pixels. */ extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image bit_depth. */ extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image color_type. */ extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image filter_type. */ extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image interlace_type. */ extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image compression_type. */ extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image resolution in pixels per meter, from pHYs chunk data. */ extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp png_ptr, png_infop info_ptr)); extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp png_ptr, png_infop info_ptr)); extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns pixel aspect ratio, computed from pHYs chunk data. */ extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ extern PNG_EXPORT(png_uint_32, png_get_x_offset_pixels) PNGARG((png_structp png_ptr, png_infop info_ptr)); extern PNG_EXPORT(png_uint_32, png_get_y_offset_pixels) PNGARG((png_structp png_ptr, png_infop info_ptr)); extern PNG_EXPORT(png_uint_32, png_get_x_offset_microns) PNGARG((png_structp png_ptr, png_infop info_ptr)); extern PNG_EXPORT(png_uint_32, png_get_y_offset_microns) PNGARG((png_structp png_ptr, png_infop info_ptr)); #endif /* PNG_EASY_ACCESS_SUPPORTED */ /* Returns pointer to signature string read from PNG header */ extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, png_infop info_ptr)); #if defined(PNG_READ_bKGD_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, png_infop info_ptr, png_color_16p *background)); #endif /* PNG_READ_bKGD_SUPPORTED */ #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, png_infop info_ptr, png_color_16p background)); #endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */ #if defined(PNG_READ_cHRM_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, png_infop info_ptr, double *white_x, double *white_y, double *red_x, double *red_y, double *green_x, double *green_y, double *blue_x, double *blue_y)); #endif /* PNG_READ_cHRM_SUPPORTED */ #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED) extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, png_infop info_ptr, double white_x, double white_y, double red_x, double red_y, double green_x, double green_y, double blue_x, double blue_y)); #endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */ #if defined(PNG_READ_gAMA_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, png_infop info_ptr, double *file_gamma)); #endif /* PNG_READ_gAMA_SUPPORTED */ #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, png_infop info_ptr, double file_gamma)); #endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */ #if defined(PNG_READ_hIST_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)); #endif /* PNG_READ_hIST_SUPPORTED */ #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED) extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)); #endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */ extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_type, int *compression_type, int *filter_type)); extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, int filter_type)); #if defined(PNG_READ_oFFs_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y, int *unit_type)); #endif /* PNG_READ_oFFs_SUPPORTED */ #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)); #endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */ #if defined(PNG_READ_pCAL_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, png_charp *units, png_charpp *params)); #endif /* PNG_READ_pCAL_SUPPORTED */ #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)); #endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */ #if defined(PNG_READ_pHYs_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); #endif /* PNG_READ_pHYs_SUPPORTED */ #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); #endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */ extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, png_infop info_ptr, png_colorp *palette, int *num_palette)); extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, png_infop info_ptr, png_colorp palette, int num_palette)); #if defined(PNG_READ_sBIT_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)); #endif /* PNG_READ_sBIT_SUPPORTED */ #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED) 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, int *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, int intent)); extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, png_infop info_ptr, int 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, png_infop info_ptr, png_textp *text_ptr, int *num_text)); #endif /* PNG_READ_tEXt_SUPPORTED || PNG_READ_zTXt_SUPPORTED */ #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \ defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, int num_text)); #endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */ #if defined(PNG_READ_tIME_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)); #endif /* PNG_READ_tIME_SUPPORTED */ #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED) extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, png_infop info_ptr, png_timep mod_time)); #endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */ #if defined(PNG_READ_tRNS_SUPPORTED) extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, png_infop info_ptr, png_bytep *trans, int *num_trans, png_color_16p *trans_values)); #endif /* PNG_READ_tRNS_SUPPORTED */ #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, png_infop info_ptr, png_bytep trans, int num_trans, png_color_16p trans_values)); #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */ /* Define PNG_DEBUG at compile time for debugging information. Higher * numbers for PNG_DEBUG mean more debugging information. This has * only been added since version 0.95 so it is not implemented throughout * libpng yet, but more support will be added as needed. */ #if (PNG_DEBUG > 0) #ifdef PNG_NO_STDIO #include #endif #ifndef PNG_DEBUG_FILE #define PNG_DEBUG_FILE stderr #endif /* PNG_DEBUG_FILE */ #define png_debug(l,m) if (PNG_DEBUG > l) \ fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ (l==2 ? "\t\t":(l==3 ? "\t\t\t":"")))) #define png_debug1(l,m,p1) if (PNG_DEBUG > l) \ fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ (l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1) #define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \ fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ (l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1,p2) #else #define png_debug(l, m) #define png_debug1(l, m, p1) #define png_debug2(l, m, p1, p2) #endif /* (PNG_DEBUG > 0) */ #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED /* With these routines we avoid an integer divide, which will be slower on * most machines. However, it does take more operations than the corresponding * divide method, so it may be slower on a few RISC systems. There are two * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. * * Note that the rounding factors are NOT supposed to be the same! 128 and * 32768 are correct for the NODIV code; 127 and 32767 are correct for the * standard method. * * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] */ /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ # define png_composite(composite, fg, alpha, bg) \ { png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \ (png_uint_16)(bg)*(png_uint_16)(255 - \ (png_uint_16)(alpha)) + (png_uint_16)128); \ (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } # define png_composite_16(composite, fg, alpha, bg) \ { png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \ (png_uint_32)(bg)*(png_uint_32)(65535L - \ (png_uint_32)(alpha)) + (png_uint_32)32768L); \ (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } #else /* standard method using integer division */ /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ # define png_composite(composite, fg, alpha, bg) \ (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ (png_uint_16)127) / 255) # define png_composite_16(composite, fg, alpha, bg) \ (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ (png_uint_32)32767) / (png_uint_32)65535L) #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ /* These next functions are used internally in the code. They generally * shouldn't be used unless you are writing code to add or replace some * functionality in libpng. More information about most functions can * be found in the files where the functions are located. */ #if defined(PNG_INTERNAL) /* Various modes of operation. Note that after an init, mode is set to * 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 #define PNG_READ_CHUNK_MODE 1 #define PNG_READ_IDAT_MODE 2 #define PNG_SKIP_MODE 3 #define PNG_READ_tEXt_MODE 4 #define PNG_READ_zTXt_MODE 5 #define PNG_READ_DONE_MODE 6 #define PNG_ERROR_MODE 7 /* flags for the transformations the PNG library does on the image data */ #define PNG_BGR 0x0001 #define PNG_INTERLACE 0x0002 #define PNG_PACK 0x0004 #define PNG_SHIFT 0x0008 #define PNG_SWAP_BYTES 0x0010 #define PNG_INVERT_MONO 0x0020 #define PNG_DITHER 0x0040 #define PNG_BACKGROUND 0x0080 #define PNG_BACKGROUND_EXPAND 0x0100 #define PNG_RGB_TO_GRAY 0x0200 /* Not currently implemented */ #define PNG_16_TO_8 0x0400 #define PNG_RGBA 0x0800 #define PNG_EXPAND 0x1000 #define PNG_GAMMA 0x2000 #define PNG_GRAY_TO_RGB 0x4000 #define PNG_FILLER 0x8000 #define PNG_PACKSWAP 0x10000L #define PNG_SWAP_ALPHA 0x20000L #define PNG_STRIP_ALPHA 0x40000L #define PNG_INVERT_ALPHA 0x80000L #define PNG_USER_TRANSFORM 0x100000L /* flags for png_create_struct */ #define PNG_STRUCT_PNG 0x0001 #define PNG_STRUCT_INFO 0x0002 /* Scaling factor for filter heuristic weighting calculations */ #define PNG_WEIGHT_SHIFT 8 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) #define PNG_COST_SHIFT 3 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) /* flags for the png_ptr->flags rather than declaring a byte for each one */ #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 #define PNG_FLAG_ZLIB_FINISHED 0x0020 #define PNG_FLAG_ROW_INIT 0x0040 #define PNG_FLAG_FILLER_AFTER 0x0080 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 #define PNG_FLAG_FREE_PALETTE 0x1000 #define PNG_FLAG_FREE_TRANS 0x2000 #define PNG_FLAG_FREE_HIST 0x4000 #define PNG_FLAG_HAVE_CHUNK_HEADER 0x8000L #define PNG_FLAG_WROTE_tIME 0x10000L #define PNG_FLAG_BACKGROUND_IS_GRAY 0x20000L #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ PNG_FLAG_CRC_ANCILLARY_NOWARN) #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ PNG_FLAG_CRC_CRITICAL_IGNORE) #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ PNG_FLAG_CRC_CRITICAL_MASK) /* save typing and make code easier to understand */ #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ abs((int)((c1).green) - (int)((c2).green)) + \ abs((int)((c1).blue) - (int)((c2).blue))) /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) /* place to hold the signature string for a PNG file. */ extern png_byte FARDATA png_sig[8]; /* 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[5]; extern png_byte FARDATA png_IDAT[5]; extern png_byte FARDATA png_IEND[5]; extern png_byte FARDATA png_PLTE[5]; extern png_byte FARDATA png_bKGD[5]; extern png_byte FARDATA png_cHRM[5]; extern png_byte FARDATA png_gAMA[5]; extern png_byte FARDATA png_hIST[5]; extern png_byte FARDATA png_oFFs[5]; extern png_byte FARDATA png_pCAL[5]; extern png_byte FARDATA png_pHYs[5]; extern png_byte FARDATA png_sBIT[5]; extern png_byte FARDATA png_sRGB[5]; extern png_byte FARDATA png_tEXt[5]; extern png_byte FARDATA png_tIME[5]; extern png_byte FARDATA png_tRNS[5]; extern png_byte FARDATA png_zTXt[5]; #endif /* PNG_NO_EXTERN */ /* Inline macros to do direct reads of bytes from the input buffer. These * require that you are using an architecture that uses PNG byte ordering * (MSB first) and supports unaligned data storage. I think that PowerPC * in big-endian mode and 680x0 are the only ones that will support this. * The x86 line of processors definitely do not. The png_get_int_32() * routine also assumes we are using two's complement format for negative * values, which is almost certainly true. */ #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) #if defined(PNG_READ_pCAL_SUPPORTED) #define png_get_int_32(buf) ( *((png_int_32p) (buf))) #endif /* PNG_READ_pCAL_SUPPORTED */ #define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) #define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) #else #if defined(PNG_READ_pCAL_SUPPORTED) PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf)); #endif /* PNG_READ_pCAL_SUPPORTED */ 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_READ_BIG_ENDIAN_SUPPORTED */ /* 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). */ extern void png_write_init PNGARG((png_structp png_ptr)); /* allocate memory for an internal libpng struct */ PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); /* free memory from internal libpng struct */ PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); /* free any memory that info_ptr points to and reset struct. */ PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, png_infop info_ptr)); /* Function to allocate memory for zlib. */ PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); /* function to free memory for zlib */ PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); /* reset the CRC variable */ PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); /* Write the "data" buffer to whatever output you are using. */ PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, png_size_t length)); /* Read data from whatever input you are using into the "data" buffer */ PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, png_size_t length)); /* read bytes into buf, and update png_ptr->crc */ PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, png_size_t length)); /* read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); /* read the CRC from the file and compare it to the libpng calculated CRC */ PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); /* Calculate the CRC over a section of data. Note that we are only * passing a maximum of 64K on systems that have this as a memory limit, * since this is the maximum buffer size we can specify. */ PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, png_size_t length)); #if defined(PNG_WRITE_FLUSH_SUPPORTED) 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 signed numbers is * the ancillary extension chunk, pCAL. */ PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); #if defined(PNG_WRITE_pCAL_SUPPORTED) 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. * 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)); /* simple function to write the signature */ 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. */ 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, int interlace_type)); PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)); PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, png_size_t length)); PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); #if defined(PNG_WRITE_gAMA_SUPPORTED) PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); #endif #if defined(PNG_WRITE_sBIT_SUPPORTED) PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, int color_type)); #endif #if defined(PNG_WRITE_cHRM_SUPPORTED) PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, double white_x, double white_y, double red_x, double red_y, double green_x, double green_y, double blue_x, double blue_y)); #endif #if defined(PNG_WRITE_sRGB_SUPPORTED) PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, int 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)); #endif #if defined(PNG_WRITE_bKGD_SUPPORTED) PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, png_color_16p values, int color_type)); #endif #if defined(PNG_WRITE_hIST_SUPPORTED) PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, int num_hist)); #endif #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_charpp new_key)); #endif #if defined(PNG_WRITE_tEXt_SUPPORTED) PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, png_charp text, png_size_t text_len)); #endif #if defined(PNG_WRITE_zTXt_SUPPORTED) PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, png_charp text, png_size_t text_len, int compression)); #endif #if defined(PNG_WRITE_oFFs_SUPPORTED) PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, png_uint_32 x_offset, png_uint_32 y_offset, int unit_type)); #endif #if defined(PNG_WRITE_pCAL_SUPPORTED) PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)); #endif #if defined(PNG_WRITE_pHYs_SUPPORTED) PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, int unit_type)); #endif #if defined(PNG_WRITE_tIME_SUPPORTED) PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, png_timep mod_time)); #endif /* Called when finished processing a row of data */ PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); /* Internal use only. Called before first row of data */ PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); #if defined(PNG_READ_GAMMA_SUPPORTED) PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); #endif /* combine a row of data, dealing with alpha, etc. if requested */ PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, int mask)); #if defined(PNG_READ_INTERLACING_SUPPORTED) /* expand an interlaced row */ PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, png_bytep row, int pass, png_uint_32 transformations)); #endif #if defined(PNG_WRITE_INTERLACING_SUPPORTED) /* grab pixels out of a row for an interlaced pass */ PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, png_bytep row, int pass)); #endif /* unfilter a row */ PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); /* Choose the best filter to use and filter the row data */ PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, png_row_infop row_info)); /* Write out the filtered row. */ PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, png_bytep filtered_row)); /* finish a row while reading, dealing with interlacing passes, etc. */ PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); /* initialize the row buffers, etc. */ PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); /* optional call to update the users info structure */ PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, png_infop info_ptr)); /* these are the functions that do the transformations */ #if defined(PNG_READ_FILLER_SUPPORTED) PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, png_bytep row, png_uint_32 filler, png_uint_32 flags)); #endif #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ defined(PNG_READ_STRIP_ALPHA_SUPPORTED) PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, png_bytep row, png_uint_32 flags)); #endif #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) PNG_EXTERN void png_do_rgb_to_gray PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_PACK_SUPPORTED) PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_SHIFT_SUPPORTED) PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, png_color_8p sig_bits)); #endif #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_16_TO_8_SUPPORTED) PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_READ_DITHER_SUPPORTED) PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); # if defined(PNG_CORRECT_PALETTE_SUPPORTED) PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, png_colorp palette, int num_palette)); # endif #endif #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); #endif #if defined(PNG_WRITE_PACK_SUPPORTED) PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)); #endif #if defined(PNG_WRITE_SHIFT_SUPPORTED) PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, png_color_8p bit_depth)); #endif #if defined(PNG_READ_BACKGROUND_SUPPORTED) PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, png_color_16p trans_values, png_color_16p background, png_color_16p background_1, png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, png_uint_16pp gamma_16_to_1, int gamma_shift)); #endif #if defined(PNG_READ_GAMMA_SUPPORTED) PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, png_bytep gamma_table, png_uint_16pp gamma_16_table, int gamma_shift)); #endif #if defined(PNG_READ_EXPAND_SUPPORTED) PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, png_bytep row, png_color_16p trans_value)); #endif /* The following decodes the appropriate chunks, and does error correction, * 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, png_uint_32 length)); PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #if defined(PNG_READ_gAMA_SUPPORTED) PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_sBIT_SUPPORTED) PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_cHRM_SUPPORTED) 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)); #endif #if defined(PNG_READ_bKGD_SUPPORTED) PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_hIST_SUPPORTED) PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_oFFs_SUPPORTED) PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_pCAL_SUPPORTED) PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_pHYs_SUPPORTED) PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_tIME_SUPPORTED) PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_tEXt_SUPPORTED) PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif #if defined(PNG_READ_zTXt_SUPPORTED) PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); #endif PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, png_bytep chunk_name)); /* handle the transformations for reading and writing */ PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, png_infop info_ptr)); PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr)); PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, png_uint_32 length)); PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, png_bytep buffer, png_size_t length)); PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, png_bytep buffer, png_size_t buffer_length)); PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, png_bytep buffer, png_size_t buffer_length)); PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, png_infop info_ptr)); PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, png_infop info_ptr)); PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, png_infop info_ptr)); PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, png_infop info_ptr)); PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); #if defined(PNG_READ_tEXt_SUPPORTED) PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr)); #endif #if defined(PNG_READ_zTXt_SUPPORTED) PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, png_uint_32 length)); PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr)); #endif #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ #endif /* PNG_INTERNAL */ #ifdef __cplusplus } #endif /* do not put anything past this line */ #endif /* _PNG_H */