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libpng/pngread.c

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1995-07-20 07:43:20 +00:00
1997-05-16 07:46:07 +00:00
/* pngread.c - read a PNG file
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*
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* Last changed in libpng 1.2.37 [June 4, 2009]
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
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* This file contains routines that an application calls directly to
* read a PNG file or stream.
*/
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#define PNG_INTERNAL
#include "png.h"
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#if defined(PNG_READ_SUPPORTED)
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/* Create a PNG structure for reading, and allocate any memory needed. */
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png_structp PNGAPI
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png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
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png_error_ptr error_fn, png_error_ptr warn_fn)
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{
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#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
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warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
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}
/* Alternate create PNG structure for reading, and allocate any memory needed. */
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png_structp PNGAPI
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png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
{
#endif /* PNG_USER_MEM_SUPPORTED */
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#ifdef PNG_SETJMP_SUPPORTED
volatile
#endif
png_structp png_ptr;
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#ifdef PNG_SETJMP_SUPPORTED
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#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
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#endif
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int i;
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png_debug(1, "in png_create_read_struct");
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#ifdef PNG_USER_MEM_SUPPORTED
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png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
(png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
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#else
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png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
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#endif
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if (png_ptr == NULL)
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return (NULL);
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/* Added at libpng-1.2.6 */
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#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
#endif
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#ifdef PNG_SETJMP_SUPPORTED
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#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
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if (setjmp(png_ptr->jmpbuf))
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#endif
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{
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png_free(png_ptr, png_ptr->zbuf);
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png_ptr->zbuf = NULL;
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#ifdef PNG_USER_MEM_SUPPORTED
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png_destroy_struct_2((png_voidp)png_ptr,
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(png_free_ptr)free_fn, (png_voidp)mem_ptr);
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#else
png_destroy_struct((png_voidp)png_ptr);
#endif
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return (NULL);
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}
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#ifdef USE_FAR_KEYWORD
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png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
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#endif
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#endif
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#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
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#endif
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png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
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if (user_png_ver)
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{
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i = 0;
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do
{
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if (user_png_ver[i] != png_libpng_ver[i])
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
} while (png_libpng_ver[i++]);
}
else
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
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if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
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{
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/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
* we must recompile any applications that use any older library version.
* For versions after libpng 1.0, we will be compatible, so we need
* only check the first digit.
*/
if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
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(user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
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(user_png_ver[0] == '0' && user_png_ver[2] < '9'))
{
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#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[80];
if (user_png_ver)
{
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png_snprintf(msg, 80,
"Application was compiled with png.h from libpng-%.20s",
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user_png_ver);
png_warning(png_ptr, msg);
}
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png_snprintf(msg, 80,
"Application is running with png.c from libpng-%.20s",
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png_libpng_ver);
png_warning(png_ptr, msg);
#endif
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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png_ptr->flags = 0;
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#endif
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png_error(png_ptr,
"Incompatible libpng version in application and library");
}
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}
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/* Initialize zbuf - compression buffer */
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png_ptr->zbuf_size = PNG_ZBUF_SIZE;
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png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
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png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr;
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switch (inflateInit(&png_ptr->zstream))
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{
case Z_OK: /* Do nothing */ break;
case Z_MEM_ERROR:
case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
default: png_error(png_ptr, "Unknown zlib error");
}
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png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
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#ifdef PNG_SETJMP_SUPPORTED
/* Applications that neglect to set up their own setjmp() and then encounter
a png_error() will longjmp here. Since the jmpbuf is then meaningless we
abort instead of returning. */
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
PNG_ABORT();
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png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
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#else
if (setjmp(png_ptr->jmpbuf))
PNG_ABORT();
#endif
#endif
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return (png_ptr);
}
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#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
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/* Initialize PNG structure for reading, and allocate any memory needed.
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This interface is deprecated in favour of the png_create_read_struct(),
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and it will disappear as of libpng-1.3.0. */
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#undef png_read_init
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void PNGAPI
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png_read_init(png_structp png_ptr)
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{
/* We only come here via pre-1.0.7-compiled applications */
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png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
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}
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void PNGAPI
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png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
png_size_t png_struct_size, png_size_t png_info_size)
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{
/* We only come here via pre-1.0.12-compiled applications */
if (png_ptr == NULL)
return;
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#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
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if (png_sizeof(png_struct) > png_struct_size ||
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png_sizeof(png_info) > png_info_size)
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{
char msg[80];
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png_ptr->warning_fn = NULL;
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if (user_png_ver)
{
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png_snprintf(msg, 80,
"Application was compiled with png.h from libpng-%.20s",
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user_png_ver);
png_warning(png_ptr, msg);
}
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png_snprintf(msg, 80,
"Application is running with png.c from libpng-%.20s",
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png_libpng_ver);
png_warning(png_ptr, msg);
}
#endif
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if (png_sizeof(png_struct) > png_struct_size)
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{
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png_ptr->error_fn = NULL;
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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png_ptr->flags = 0;
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#endif
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png_error(png_ptr,
"The png struct allocated by the application for reading is too small.");
}
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if (png_sizeof(png_info) > png_info_size)
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{
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png_ptr->error_fn = NULL;
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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png_ptr->flags = 0;
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#endif
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png_error(png_ptr,
"The info struct allocated by application for reading is too small.");
}
png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
}
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#endif /* PNG_1_0_X || PNG_1_2_X */
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void PNGAPI
png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
png_size_t png_struct_size)
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{
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#ifdef PNG_SETJMP_SUPPORTED
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jmp_buf tmp_jmp; /* to save current jump buffer */
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#endif
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int i = 0;
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png_structp png_ptr=*ptr_ptr;
if (png_ptr == NULL)
return;
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do
{
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if (user_png_ver[i] != png_libpng_ver[i])
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{
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#ifdef PNG_LEGACY_SUPPORTED
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
#else
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png_ptr->warning_fn = NULL;
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png_warning(png_ptr,
"Application uses deprecated png_read_init() and should be recompiled.");
break;
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#endif
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}
} while (png_libpng_ver[i++]);
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png_debug(1, "in png_read_init_3");
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#ifdef PNG_SETJMP_SUPPORTED
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/* Save jump buffer and error functions */
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png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
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#endif
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if (png_sizeof(png_struct) > png_struct_size)
{
png_destroy_struct(png_ptr);
*ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
png_ptr = *ptr_ptr;
}
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/* Reset all variables to 0 */
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png_memset(png_ptr, 0, png_sizeof(png_struct));
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#ifdef PNG_SETJMP_SUPPORTED
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/* Restore jump buffer */
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png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
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#endif
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/* Added at libpng-1.2.6 */
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#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
#endif
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/* Initialize zbuf - compression buffer */
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png_ptr->zbuf_size = PNG_ZBUF_SIZE;
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png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
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png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr;
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switch (inflateInit(&png_ptr->zstream))
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{
case Z_OK: /* Do nothing */ break;
case Z_MEM_ERROR:
case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
default: png_error(png_ptr, "Unknown zlib error");
}
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png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
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}
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#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
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/* Read the information before the actual image data. This has been
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* changed in v0.90 to allow reading a file that already has the magic
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* bytes read from the stream. You can tell libpng how many bytes have
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* been read from the beginning of the stream (up to the maximum of 8)
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* via png_set_sig_bytes(), and we will only check the remaining bytes
* here. The application can then have access to the signature bytes we
* read if it is determined that this isn't a valid PNG file.
*/
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void PNGAPI
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png_read_info(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr == NULL || info_ptr == NULL)
return;
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png_debug(1, "in png_read_info");
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/* If we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
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{
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png_size_t num_checked = png_ptr->sig_bytes,
num_to_check = 8 - num_checked;
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png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
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png_ptr->sig_bytes = 8;
if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
{
if (num_checked < 4 &&
png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
png_error(png_ptr, "Not a PNG file");
else
png_error(png_ptr, "PNG file corrupted by ASCII conversion");
}
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if (num_checked < 3)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
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}
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for (;;)
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{
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#ifdef PNG_USE_LOCAL_ARRAYS
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PNG_CONST PNG_IHDR;
PNG_CONST PNG_IDAT;
PNG_CONST PNG_IEND;
PNG_CONST PNG_PLTE;
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#if defined(PNG_READ_bKGD_SUPPORTED)
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PNG_CONST PNG_bKGD;
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#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
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PNG_CONST PNG_cHRM;
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#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
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PNG_CONST PNG_gAMA;
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#endif
#if defined(PNG_READ_hIST_SUPPORTED)
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PNG_CONST PNG_hIST;
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#endif
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#if defined(PNG_READ_iCCP_SUPPORTED)
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PNG_CONST PNG_iCCP;
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#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
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PNG_CONST PNG_iTXt;
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#endif
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#if defined(PNG_READ_oFFs_SUPPORTED)
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PNG_CONST PNG_oFFs;
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#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
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PNG_CONST PNG_pCAL;
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#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
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PNG_CONST PNG_pHYs;
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#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
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PNG_CONST PNG_sBIT;
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#endif
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#if defined(PNG_READ_sCAL_SUPPORTED)
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PNG_CONST PNG_sCAL;
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#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
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PNG_CONST PNG_sPLT;
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#endif
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#if defined(PNG_READ_sRGB_SUPPORTED)
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PNG_CONST PNG_sRGB;
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#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
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PNG_CONST PNG_tEXt;
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#endif
#if defined(PNG_READ_tIME_SUPPORTED)
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PNG_CONST PNG_tIME;
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#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
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PNG_CONST PNG_tRNS;
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#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
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PNG_CONST PNG_zTXt;
1999-11-29 05:32:18 +00:00
#endif
2004-11-01 20:13:40 +00:00
#endif /* PNG_USE_LOCAL_ARRAYS */
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png_uint_32 length = png_read_chunk_header(png_ptr);
2008-07-25 13:38:43 +00:00
PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
1997-01-17 07:34:35 +00:00
1997-05-16 07:46:07 +00:00
/* This should be a binary subdivision search or a hash for
* matching the chunk name rather than a linear search.
*/
2008-07-06 11:05:04 +00:00
if (!png_memcmp(chunk_name, png_IDAT, 4))
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if (png_ptr->mode & PNG_AFTER_IDAT)
2006-06-07 02:48:26 +00:00
png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
2008-07-06 11:05:04 +00:00
if (!png_memcmp(chunk_name, png_IHDR, 4))
1997-01-17 07:34:35 +00:00
png_handle_IHDR(png_ptr, info_ptr, length);
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_IEND, 4))
1997-01-17 07:34:35 +00:00
png_handle_IEND(png_ptr, info_ptr, length);
2000-02-05 05:40:16 +00:00
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
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else if (png_handle_as_unknown(png_ptr, chunk_name))
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{
2008-07-06 11:05:04 +00:00
if (!png_memcmp(chunk_name, png_IDAT, 4))
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png_ptr->mode |= PNG_HAVE_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
2008-07-06 11:05:04 +00:00
if (!png_memcmp(chunk_name, png_PLTE, 4))
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png_ptr->mode |= PNG_HAVE_PLTE;
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_IDAT, 4))
2000-02-05 05:40:16 +00:00
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
break;
}
}
#endif
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_PLTE, 4))
2000-02-05 05:40:16 +00:00
png_handle_PLTE(png_ptr, info_ptr, length);
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_IDAT, 4))
1997-05-16 07:46:07 +00:00
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
png_ptr->idat_size = length;
png_ptr->mode |= PNG_HAVE_IDAT;
break;
}
#if defined(PNG_READ_bKGD_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_bKGD, 4))
1997-05-16 07:46:07 +00:00
png_handle_bKGD(png_ptr, info_ptr, length);
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#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_cHRM, 4))
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png_handle_cHRM(png_ptr, info_ptr, length);
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#endif
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_gAMA_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_gAMA, 4))
1997-05-16 07:46:07 +00:00
png_handle_gAMA(png_ptr, info_ptr, length);
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#endif
#if defined(PNG_READ_hIST_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_hIST, 4))
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png_handle_hIST(png_ptr, info_ptr, length);
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#endif
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_oFFs_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_oFFs, 4))
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png_handle_oFFs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_pCAL, 4))
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png_handle_pCAL(png_ptr, info_ptr, length);
#endif
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#if defined(PNG_READ_sCAL_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sCAL, 4))
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png_handle_sCAL(png_ptr, info_ptr, length);
#endif
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#if defined(PNG_READ_pHYs_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_pHYs, 4))
1997-01-17 07:34:35 +00:00
png_handle_pHYs(png_ptr, info_ptr, length);
1995-09-26 10:22:39 +00:00
#endif
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_sBIT_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sBIT, 4))
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png_handle_sBIT(png_ptr, info_ptr, length);
#endif
1998-01-01 13:13:13 +00:00
#if defined(PNG_READ_sRGB_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sRGB, 4))
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png_handle_sRGB(png_ptr, info_ptr, length);
#endif
1999-12-10 15:43:02 +00:00
#if defined(PNG_READ_iCCP_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_iCCP, 4))
1999-12-10 15:43:02 +00:00
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sPLT, 4))
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png_handle_sPLT(png_ptr, info_ptr, length);
#endif
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_tEXt_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_tEXt, 4))
1997-05-16 07:46:07 +00:00
png_handle_tEXt(png_ptr, info_ptr, length);
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#endif
#if defined(PNG_READ_tIME_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_tIME, 4))
1997-01-17 07:34:35 +00:00
png_handle_tIME(png_ptr, info_ptr, length);
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#endif
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_tRNS_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_tRNS, 4))
1997-05-16 07:46:07 +00:00
png_handle_tRNS(png_ptr, info_ptr, length);
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#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_zTXt, 4))
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png_handle_zTXt(png_ptr, info_ptr, length);
1999-12-10 15:43:02 +00:00
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_iTXt, 4))
1999-12-10 15:43:02 +00:00
png_handle_iTXt(png_ptr, info_ptr, length);
1995-09-26 10:22:39 +00:00
#endif
1997-01-17 07:34:35 +00:00
else
png_handle_unknown(png_ptr, info_ptr, length);
1995-07-20 07:43:20 +00:00
}
}
2004-07-28 13:20:44 +00:00
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1995-07-20 07:43:20 +00:00
2009-05-20 17:43:52 +00:00
/* Optional call to update the users info_ptr structure */
2000-05-06 19:09:57 +00:00
void PNGAPI
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png_read_update_info(png_structp png_ptr, png_infop info_ptr)
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{
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png_debug(1, "in png_read_update_info");
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if (png_ptr == NULL)
return;
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if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
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png_read_start_row(png_ptr);
2000-11-10 18:26:19 +00:00
else
png_warning(png_ptr,
"Ignoring extra png_read_update_info() call; row buffer not reallocated");
1997-01-17 07:34:35 +00:00
png_read_transform_info(png_ptr, info_ptr);
1995-09-26 10:22:39 +00:00
}
2004-07-28 13:20:44 +00:00
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1998-01-01 13:13:13 +00:00
/* Initialize palette, background, etc, after transformations
* are set, but before any reading takes place. This allows
1998-06-14 19:43:31 +00:00
* the user to obtain a gamma-corrected palette, for example.
1998-01-01 13:13:13 +00:00
* If the user doesn't call this, we will do it ourselves.
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_start_read_image(png_structp png_ptr)
1995-07-20 07:43:20 +00:00
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_start_read_image");
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
1996-06-05 20:50:50 +00:00
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
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png_read_start_row(png_ptr);
1995-07-20 07:43:20 +00:00
}
2004-07-28 13:20:44 +00:00
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1995-07-20 07:43:20 +00:00
2004-07-28 13:20:44 +00:00
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
1995-07-20 07:43:20 +00:00
{
1999-11-29 05:32:18 +00:00
#ifdef PNG_USE_LOCAL_ARRAYS
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_IDAT;
2007-05-18 18:40:59 +00:00
PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
2008-07-10 14:10:58 +00:00
0xff};
2007-05-18 18:40:59 +00:00
PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
1999-11-29 05:32:18 +00:00
#endif
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int ret;
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
2008-12-01 14:58:57 +00:00
png_debug2(1, "in png_read_row (row %lu, pass %d)",
1997-05-16 07:46:07 +00:00
png_ptr->row_number, png_ptr->pass);
1996-06-05 20:50:50 +00:00
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
1995-07-20 07:43:20 +00:00
png_read_start_row(png_ptr);
1998-05-02 17:52:25 +00:00
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
2009-05-20 17:43:52 +00:00
/* Check for transforms that have been set but were defined out */
1998-05-02 17:52:25 +00:00
#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & PNG_FILLER)
png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
if (png_ptr->transformations & PNG_PACK)
png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT)
png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
if (png_ptr->transformations & PNG_BGR)
png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
#endif
}
1995-07-20 07:43:20 +00:00
1995-09-26 10:22:39 +00:00
#if defined(PNG_READ_INTERLACING_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* If interlaced and we do not need a new row, combine row and return */
1995-07-20 07:43:20 +00:00
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
{
case 0:
2000-02-05 05:40:16 +00:00
if (png_ptr->row_number & 0x07)
1995-07-20 07:43:20 +00:00
{
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
1996-01-16 07:51:56 +00:00
png_read_finish_row(png_ptr);
1995-07-20 07:43:20 +00:00
return;
}
break;
case 1:
2000-02-05 05:40:16 +00:00
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
1995-07-20 07:43:20 +00:00
{
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 2:
2000-02-05 05:40:16 +00:00
if ((png_ptr->row_number & 0x07) != 4)
1995-07-20 07:43:20 +00:00
{
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL && (png_ptr->row_number & 4))
1996-01-16 07:51:56 +00:00
png_combine_row(png_ptr, dsp_row,
1995-07-20 07:43:20 +00:00
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 3:
if ((png_ptr->row_number & 3) || png_ptr->width < 3)
{
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 4:
if ((png_ptr->row_number & 3) != 2)
1996-01-16 07:51:56 +00:00
{
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL && (png_ptr->row_number & 2))
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
case 5:
if ((png_ptr->row_number & 1) || png_ptr->width < 2)
{
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
png_read_finish_row(png_ptr);
return;
}
break;
1996-01-16 07:51:56 +00:00
case 6:
1995-07-20 07:43:20 +00:00
if (!(png_ptr->row_number & 1))
{
png_read_finish_row(png_ptr);
return;
}
break;
}
}
1995-09-26 10:22:39 +00:00
#endif
1995-07-20 07:43:20 +00:00
1996-06-05 20:50:50 +00:00
if (!(png_ptr->mode & PNG_HAVE_IDAT))
png_error(png_ptr, "Invalid attempt to read row data");
1995-07-20 07:43:20 +00:00
1997-01-17 07:34:35 +00:00
png_ptr->zstream.next_out = png_ptr->row_buf;
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
1995-07-20 07:43:20 +00:00
do
{
1997-01-17 07:34:35 +00:00
if (!(png_ptr->zstream.avail_in))
1995-07-20 07:43:20 +00:00
{
while (!png_ptr->idat_size)
{
1997-01-17 07:34:35 +00:00
png_crc_finish(png_ptr, 0);
1995-07-20 07:43:20 +00:00
2008-07-06 11:05:04 +00:00
png_ptr->idat_size = png_read_chunk_header(png_ptr);
1997-01-17 07:34:35 +00:00
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
1995-07-20 07:43:20 +00:00
}
1997-01-17 07:34:35 +00:00
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_in = png_ptr->zbuf;
1995-07-20 07:43:20 +00:00
if (png_ptr->zbuf_size > png_ptr->idat_size)
1997-01-17 07:34:35 +00:00
png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
1997-05-16 07:46:07 +00:00
png_crc_read(png_ptr, png_ptr->zbuf,
(png_size_t)png_ptr->zstream.avail_in);
1997-01-17 07:34:35 +00:00
png_ptr->idat_size -= png_ptr->zstream.avail_in;
1995-07-20 07:43:20 +00:00
}
1997-01-17 07:34:35 +00:00
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
1995-07-20 07:43:20 +00:00
if (ret == Z_STREAM_END)
{
1997-01-17 07:34:35 +00:00
if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
1995-07-20 07:43:20 +00:00
png_ptr->idat_size)
1995-12-19 09:22:19 +00:00
png_error(png_ptr, "Extra compressed data");
1997-01-17 07:34:35 +00:00
png_ptr->mode |= PNG_AFTER_IDAT;
1996-06-05 20:50:50 +00:00
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
1996-01-16 07:51:56 +00:00
break;
1995-07-20 07:43:20 +00:00
}
if (ret != Z_OK)
1997-01-17 07:34:35 +00:00
png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
1996-06-05 20:50:50 +00:00
"Decompression error");
1997-01-17 07:34:35 +00:00
} while (png_ptr->zstream.avail_out);
1995-07-20 07:43:20 +00:00
png_ptr->row_info.color_type = png_ptr->color_type;
png_ptr->row_info.width = png_ptr->iwidth;
png_ptr->row_info.channels = png_ptr->channels;
png_ptr->row_info.bit_depth = png_ptr->bit_depth;
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
2004-08-04 11:34:52 +00:00
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
png_ptr->row_info.width);
1995-07-20 07:43:20 +00:00
2008-07-10 14:10:58 +00:00
if (png_ptr->row_buf[0])
1996-06-05 20:50:50 +00:00
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
1995-07-20 07:43:20 +00:00
1998-02-09 02:56:40 +00:00
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
1998-02-07 16:20:57 +00:00
png_ptr->rowbytes + 1);
2006-03-04 22:50:47 +00:00
2000-12-15 14:54:42 +00:00
#if defined(PNG_MNG_FEATURES_SUPPORTED)
2008-07-10 14:10:58 +00:00
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
2000-12-15 14:54:42 +00:00
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
{
/* Intrapixel differencing */
png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
}
#endif
1995-07-20 07:43:20 +00:00
2004-11-26 23:28:09 +00:00
if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
1995-07-20 07:43:20 +00:00
png_do_read_transformations(png_ptr);
1995-09-26 10:22:39 +00:00
#if defined(PNG_READ_INTERLACING_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* Blow up interlaced rows to full size */
1995-07-20 07:43:20 +00:00
if (png_ptr->interlaced &&
(png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->pass < 6)
2009-05-20 17:43:52 +00:00
/* Old interface (pre-1.0.9):
* png_do_read_interlace(&(png_ptr->row_info),
* png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
*/
2001-01-12 21:13:06 +00:00
png_do_read_interlace(png_ptr);
1995-07-20 07:43:20 +00:00
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, dsp_row,
png_pass_dsp_mask[png_ptr->pass]);
1997-05-16 07:46:07 +00:00
if (row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, row,
png_pass_mask[png_ptr->pass]);
}
else
1995-09-26 10:22:39 +00:00
#endif
1995-07-20 07:43:20 +00:00
{
1997-05-16 07:46:07 +00:00
if (row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, row, 0xff);
1997-05-16 07:46:07 +00:00
if (dsp_row != NULL)
1995-07-20 07:43:20 +00:00
png_combine_row(png_ptr, dsp_row, 0xff);
}
png_read_finish_row(png_ptr);
1998-03-07 12:06:55 +00:00
if (png_ptr->read_row_fn != NULL)
(*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
1995-07-20 07:43:20 +00:00
}
2004-07-28 13:20:44 +00:00
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1995-07-20 07:43:20 +00:00
2004-07-28 13:20:44 +00:00
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1997-05-16 07:46:07 +00:00
/* Read one or more rows of image data. If the image is interlaced,
1998-01-01 13:13:13 +00:00
* and png_set_interlace_handling() has been called, the rows need to
* contain the contents of the rows from the previous pass. If the
1998-06-06 20:31:35 +00:00
* image has alpha or transparency, and png_handle_alpha()[*] has been
1998-01-01 13:13:13 +00:00
* called, the rows contents must be initialized to the contents of the
* screen.
1998-12-29 17:47:59 +00:00
*
1998-01-01 13:13:13 +00:00
* "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.
1998-06-06 20:31:35 +00:00
*
2006-03-02 13:23:18 +00:00
* [*] png_handle_alpha() does not exist yet, as of this version of libpng
1998-01-01 13:13:13 +00:00
*/
1995-12-19 09:22:19 +00:00
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_read_rows(png_structp png_ptr, png_bytepp row,
1996-01-16 07:51:56 +00:00
png_bytepp display_row, png_uint_32 num_rows)
1995-07-20 07:43:20 +00:00
{
1996-01-16 07:51:56 +00:00
png_uint_32 i;
png_bytepp rp;
png_bytepp dp;
1995-07-20 07:43:20 +00:00
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_read_rows");
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
1995-11-28 17:22:13 +00:00
rp = row;
dp = display_row;
1998-05-21 14:27:50 +00:00
if (rp != NULL && dp != NULL)
1998-05-02 17:52:25 +00:00
for (i = 0; i < num_rows; i++)
{
png_bytep rptr = *rp++;
png_bytep dptr = *dp++;
1998-12-29 17:47:59 +00:00
1998-05-02 17:52:25 +00:00
png_read_row(png_ptr, rptr, dptr);
}
2008-07-10 14:10:58 +00:00
else if (rp != NULL)
1998-05-02 17:52:25 +00:00
for (i = 0; i < num_rows; i++)
{
1998-05-21 14:27:50 +00:00
png_bytep rptr = *rp;
2001-10-27 12:35:13 +00:00
png_read_row(png_ptr, rptr, png_bytep_NULL);
1998-05-21 14:27:50 +00:00
rp++;
}
2008-07-10 14:10:58 +00:00
else if (dp != NULL)
1998-05-21 14:27:50 +00:00
for (i = 0; i < num_rows; i++)
{
png_bytep dptr = *dp;
2001-10-27 12:35:13 +00:00
png_read_row(png_ptr, png_bytep_NULL, dptr);
1998-05-21 14:27:50 +00:00
dp++;
1998-05-02 17:52:25 +00:00
}
1995-07-20 07:43:20 +00:00
}
2004-07-28 13:20:44 +00:00
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1995-07-20 07:43:20 +00:00
2004-07-28 13:20:44 +00:00
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1997-05-16 07:46:07 +00:00
/* Read the entire image. If the image has an alpha channel or a tRNS
1998-06-14 19:43:31 +00:00
* chunk, and you have called png_handle_alpha()[*], you will need to
1998-01-01 13:13:13 +00:00
* 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.
1998-06-14 19:43:31 +00:00
*
2006-03-02 13:23:18 +00:00
* [*] png_handle_alpha() does not exist yet, as of this version of libpng
1998-01-01 13:13:13 +00:00
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_read_image(png_structp png_ptr, png_bytepp image)
1995-07-20 07:43:20 +00:00
{
2008-07-06 11:05:04 +00:00
png_uint_32 i, image_height;
1995-07-20 07:43:20 +00:00
int pass, j;
1996-01-16 07:51:56 +00:00
png_bytepp rp;
1995-07-20 07:43:20 +00:00
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_read_image");
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
1999-09-17 17:27:26 +00:00
#ifdef PNG_READ_INTERLACING_SUPPORTED
1995-07-20 07:43:20 +00:00
pass = png_set_interlace_handling(png_ptr);
1999-09-17 17:27:26 +00:00
#else
if (png_ptr->interlaced)
png_error(png_ptr,
"Cannot read interlaced image -- interlace handler disabled.");
pass = 1;
#endif
1996-06-05 20:50:50 +00:00
1998-04-21 20:03:57 +00:00
image_height=png_ptr->height;
png_ptr->num_rows = image_height; /* Make sure this is set correctly */
1996-06-05 20:50:50 +00:00
1995-07-20 07:43:20 +00:00
for (j = 0; j < pass; j++)
{
rp = image;
1998-04-21 20:03:57 +00:00
for (i = 0; i < image_height; i++)
1995-07-20 07:43:20 +00:00
{
2001-10-27 12:35:13 +00:00
png_read_row(png_ptr, *rp, png_bytep_NULL);
1995-07-20 07:43:20 +00:00
rp++;
}
}
}
2004-07-28 13:20:44 +00:00
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1995-07-20 07:43:20 +00:00
2004-07-28 13:20:44 +00:00
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1997-05-16 07:46:07 +00:00
/* Read the end of the PNG file. Will not read past the end of the
1998-01-01 13:13:13 +00:00
* 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.
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
1997-01-17 07:34:35 +00:00
png_read_end(png_structp png_ptr, png_infop info_ptr)
1995-07-20 07:43:20 +00:00
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_read_end");
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
1997-05-16 07:46:07 +00:00
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
1995-07-20 07:43:20 +00:00
do
{
1999-11-29 05:32:18 +00:00
#ifdef PNG_USE_LOCAL_ARRAYS
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_IHDR;
PNG_CONST PNG_IDAT;
PNG_CONST PNG_IEND;
PNG_CONST PNG_PLTE;
1999-11-29 05:32:18 +00:00
#if defined(PNG_READ_bKGD_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_bKGD;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_cHRM;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_gAMA;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_hIST;
1999-11-29 05:32:18 +00:00
#endif
1999-12-10 15:43:02 +00:00
#if defined(PNG_READ_iCCP_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_iCCP;
1999-12-10 15:43:02 +00:00
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_iTXt;
1999-12-10 15:43:02 +00:00
#endif
1999-11-29 05:32:18 +00:00
#if defined(PNG_READ_oFFs_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_oFFs;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_pCAL;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_pHYs;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_sBIT;
1999-11-29 05:32:18 +00:00
#endif
2000-02-05 05:40:16 +00:00
#if defined(PNG_READ_sCAL_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_sCAL;
1999-12-10 15:43:02 +00:00
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_sPLT;
1999-12-10 15:43:02 +00:00
#endif
1999-11-29 05:32:18 +00:00
#if defined(PNG_READ_sRGB_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_sRGB;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_tEXt;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_tIME;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_tRNS;
1999-11-29 05:32:18 +00:00
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
2007-05-21 18:27:47 +00:00
PNG_CONST PNG_zTXt;
1999-11-29 05:32:18 +00:00
#endif
2004-11-01 20:13:40 +00:00
#endif /* PNG_USE_LOCAL_ARRAYS */
2008-07-25 13:38:43 +00:00
png_uint_32 length = png_read_chunk_header(png_ptr);
PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
1997-01-17 07:34:35 +00:00
2008-07-06 11:05:04 +00:00
if (!png_memcmp(chunk_name, png_IHDR, 4))
1997-01-17 07:34:35 +00:00
png_handle_IHDR(png_ptr, info_ptr, length);
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_IEND, 4))
2000-02-05 05:40:16 +00:00
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2008-07-06 11:05:04 +00:00
else if (png_handle_as_unknown(png_ptr, chunk_name))
2000-02-05 05:40:16 +00:00
{
2008-07-06 11:05:04 +00:00
if (!png_memcmp(chunk_name, png_IDAT, 4))
2000-02-05 05:40:16 +00:00
{
2006-06-07 02:48:26 +00:00
if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
2000-02-05 05:40:16 +00:00
png_error(png_ptr, "Too many IDAT's found");
}
png_handle_unknown(png_ptr, info_ptr, length);
2008-07-06 11:05:04 +00:00
if (!png_memcmp(chunk_name, png_PLTE, 4))
2000-02-05 05:40:16 +00:00
png_ptr->mode |= PNG_HAVE_PLTE;
}
#endif
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_IDAT, 4))
1997-05-16 07:46:07 +00:00
{
/* Zero length IDATs are legal after the last IDAT has been
* read, but not after other chunks have been read.
*/
2006-06-07 02:48:26 +00:00
if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
1997-05-16 07:46:07 +00:00
png_error(png_ptr, "Too many IDAT's found");
2000-04-14 19:20:47 +00:00
png_crc_finish(png_ptr, length);
1997-05-16 07:46:07 +00:00
}
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_PLTE, 4))
1997-01-17 07:34:35 +00:00
png_handle_PLTE(png_ptr, info_ptr, length);
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_bKGD_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_bKGD, 4))
1997-01-17 07:34:35 +00:00
png_handle_bKGD(png_ptr, info_ptr, length);
1997-05-16 07:46:07 +00:00
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_cHRM, 4))
1997-05-16 07:46:07 +00:00
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_gAMA_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_gAMA, 4))
1997-05-16 07:46:07 +00:00
png_handle_gAMA(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_hIST, 4))
1997-01-17 07:34:35 +00:00
png_handle_hIST(png_ptr, info_ptr, length);
1997-05-16 07:46:07 +00:00
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_oFFs, 4))
1997-01-17 07:34:35 +00:00
png_handle_oFFs(png_ptr, info_ptr, length);
1997-05-16 07:46:07 +00:00
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_pCAL, 4))
1997-05-16 07:46:07 +00:00
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
1999-12-10 15:43:02 +00:00
#if defined(PNG_READ_sCAL_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sCAL, 4))
1999-12-10 15:43:02 +00:00
png_handle_sCAL(png_ptr, info_ptr, length);
#endif
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_pHYs_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_pHYs, 4))
1997-05-16 07:46:07 +00:00
png_handle_pHYs(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sBIT, 4))
1997-05-16 07:46:07 +00:00
png_handle_sBIT(png_ptr, info_ptr, length);
1995-09-26 10:22:39 +00:00
#endif
1998-01-01 13:13:13 +00:00
#if defined(PNG_READ_sRGB_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sRGB, 4))
1998-01-01 13:13:13 +00:00
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
1999-12-10 15:43:02 +00:00
#if defined(PNG_READ_iCCP_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_iCCP, 4))
1999-12-10 15:43:02 +00:00
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_sPLT, 4))
1999-12-10 15:43:02 +00:00
png_handle_sPLT(png_ptr, info_ptr, length);
#endif
1995-09-26 10:22:39 +00:00
#if defined(PNG_READ_tEXt_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_tEXt, 4))
1997-01-17 07:34:35 +00:00
png_handle_tEXt(png_ptr, info_ptr, length);
1995-09-26 10:22:39 +00:00
#endif
1997-05-16 07:46:07 +00:00
#if defined(PNG_READ_tIME_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_tIME, 4))
1997-05-16 07:46:07 +00:00
png_handle_tIME(png_ptr, info_ptr, length);
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_tRNS, 4))
1997-05-16 07:46:07 +00:00
png_handle_tRNS(png_ptr, info_ptr, length);
#endif
1995-09-26 10:22:39 +00:00
#if defined(PNG_READ_zTXt_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_zTXt, 4))
1997-01-17 07:34:35 +00:00
png_handle_zTXt(png_ptr, info_ptr, length);
1999-12-10 15:43:02 +00:00
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
2008-07-06 11:05:04 +00:00
else if (!png_memcmp(chunk_name, png_iTXt, 4))
1999-12-10 15:43:02 +00:00
png_handle_iTXt(png_ptr, info_ptr, length);
1995-09-26 10:22:39 +00:00
#endif
1995-07-20 07:43:20 +00:00
else
1997-01-17 07:34:35 +00:00
png_handle_unknown(png_ptr, info_ptr, length);
} while (!(png_ptr->mode & PNG_HAVE_IEND));
1995-07-20 07:43:20 +00:00
}
2004-07-28 13:20:44 +00:00
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1995-07-20 07:43:20 +00:00
2009-05-20 17:43:52 +00:00
/* Free all memory used by the read */
2000-05-06 19:09:57 +00:00
void PNGAPI
1996-06-05 20:50:50 +00:00
png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
1997-01-17 07:34:35 +00:00
png_infopp end_info_ptr_ptr)
1996-06-05 20:50:50 +00:00
{
png_structp png_ptr = NULL;
1997-01-17 07:34:35 +00:00
png_infop info_ptr = NULL, end_info_ptr = NULL;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
2007-11-20 02:02:11 +00:00
png_free_ptr free_fn = NULL;
png_voidp mem_ptr = NULL;
1999-12-10 15:43:02 +00:00
#endif
1996-06-05 20:50:50 +00:00
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_destroy_read_struct");
1997-05-16 07:46:07 +00:00
if (png_ptr_ptr != NULL)
1996-06-05 20:50:50 +00:00
png_ptr = *png_ptr_ptr;
2008-02-06 16:32:29 +00:00
if (png_ptr == NULL)
2008-01-22 03:07:36 +00:00
return;
1996-06-05 20:50:50 +00:00
2008-02-06 16:32:29 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
mem_ptr = png_ptr->mem_ptr;
#endif
1997-05-16 07:46:07 +00:00
if (info_ptr_ptr != NULL)
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info_ptr = *info_ptr_ptr;
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if (end_info_ptr_ptr != NULL)
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end_info_ptr = *end_info_ptr_ptr;
1996-06-05 20:50:50 +00:00
1997-01-17 07:34:35 +00:00
png_read_destroy(png_ptr, info_ptr, end_info_ptr);
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1997-05-16 07:46:07 +00:00
if (info_ptr != NULL)
1996-06-05 20:50:50 +00:00
{
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#if defined(PNG_TEXT_SUPPORTED)
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png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
1998-01-17 04:06:18 +00:00
#endif
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#ifdef PNG_USER_MEM_SUPPORTED
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png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
(png_voidp)mem_ptr);
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#else
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png_destroy_struct((png_voidp)info_ptr);
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#endif
2001-10-27 12:35:13 +00:00
*info_ptr_ptr = NULL;
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}
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if (end_info_ptr != NULL)
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{
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#if defined(PNG_READ_TEXT_SUPPORTED)
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png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
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#endif
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#ifdef PNG_USER_MEM_SUPPORTED
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png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
(png_voidp)mem_ptr);
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#else
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png_destroy_struct((png_voidp)end_info_ptr);
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#endif
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*end_info_ptr_ptr = NULL;
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}
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if (png_ptr != NULL)
{
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#ifdef PNG_USER_MEM_SUPPORTED
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png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
(png_voidp)mem_ptr);
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#else
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png_destroy_struct((png_voidp)png_ptr);
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#endif
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*png_ptr_ptr = NULL;
}
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}
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/* Free all memory used by the read (old method) */
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void /* PRIVATE */
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png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
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{
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#ifdef PNG_SETJMP_SUPPORTED
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jmp_buf tmp_jmp;
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#endif
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png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
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#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn;
#endif
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2008-12-01 14:58:57 +00:00
png_debug(1, "in png_read_destroy");
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if (info_ptr != NULL)
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png_info_destroy(png_ptr, info_ptr);
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1997-05-16 07:46:07 +00:00
if (end_info_ptr != NULL)
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png_info_destroy(png_ptr, end_info_ptr);
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1997-01-17 07:34:35 +00:00
png_free(png_ptr, png_ptr->zbuf);
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png_free(png_ptr, png_ptr->big_row_buf);
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png_free(png_ptr, png_ptr->prev_row);
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png_free(png_ptr, png_ptr->chunkdata);
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#if defined(PNG_READ_DITHER_SUPPORTED)
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png_free(png_ptr, png_ptr->palette_lookup);
png_free(png_ptr, png_ptr->dither_index);
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#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
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png_free(png_ptr, png_ptr->gamma_table);
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#endif
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
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png_free(png_ptr, png_ptr->gamma_from_1);
png_free(png_ptr, png_ptr->gamma_to_1);
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#endif
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#ifdef PNG_FREE_ME_SUPPORTED
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if (png_ptr->free_me & PNG_FREE_PLTE)
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png_zfree(png_ptr, png_ptr->palette);
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png_ptr->free_me &= ~PNG_FREE_PLTE;
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#else
if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
png_zfree(png_ptr, png_ptr->palette);
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
#endif
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#if defined(PNG_tRNS_SUPPORTED) || \
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defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
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#ifdef PNG_FREE_ME_SUPPORTED
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if (png_ptr->free_me & PNG_FREE_TRNS)
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png_free(png_ptr, png_ptr->trans);
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png_ptr->free_me &= ~PNG_FREE_TRNS;
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#else
if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
png_free(png_ptr, png_ptr->trans);
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
#endif
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#endif
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#if defined(PNG_READ_hIST_SUPPORTED)
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#ifdef PNG_FREE_ME_SUPPORTED
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if (png_ptr->free_me & PNG_FREE_HIST)
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png_free(png_ptr, png_ptr->hist);
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png_ptr->free_me &= ~PNG_FREE_HIST;
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#else
if (png_ptr->flags & PNG_FLAG_FREE_HIST)
png_free(png_ptr, png_ptr->hist);
png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
#endif
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#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
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if (png_ptr->gamma_16_table != NULL)
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{
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int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
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for (i = 0; i < istop; i++)
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{
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png_free(png_ptr, png_ptr->gamma_16_table[i]);
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}
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png_free(png_ptr, png_ptr->gamma_16_table);
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}
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#if defined(PNG_READ_BACKGROUND_SUPPORTED)
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if (png_ptr->gamma_16_from_1 != NULL)
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{
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int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
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for (i = 0; i < istop; i++)
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{
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png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
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}
1997-01-17 07:34:35 +00:00
png_free(png_ptr, png_ptr->gamma_16_from_1);
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}
1997-05-16 07:46:07 +00:00
if (png_ptr->gamma_16_to_1 != NULL)
1995-07-20 07:43:20 +00:00
{
1998-05-02 17:52:25 +00:00
int i;
int istop = (1 << (8 - png_ptr->gamma_shift));
1998-04-21 20:03:57 +00:00
for (i = 0; i < istop; i++)
1995-07-20 07:43:20 +00:00
{
1997-01-17 07:34:35 +00:00
png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
1995-07-20 07:43:20 +00:00
}
1997-01-17 07:34:35 +00:00
png_free(png_ptr, png_ptr->gamma_16_to_1);
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}
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#endif
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#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
1999-12-10 15:43:02 +00:00
#endif
1995-11-28 17:22:13 +00:00
1997-01-17 07:34:35 +00:00
inflateEnd(&png_ptr->zstream);
1995-12-19 09:22:19 +00:00
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
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png_free(png_ptr, png_ptr->save_buffer);
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#endif
1996-06-05 20:50:50 +00:00
2002-06-20 11:54:34 +00:00
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
#ifdef PNG_TEXT_SUPPORTED
png_free(png_ptr, png_ptr->current_text);
#endif /* PNG_TEXT_SUPPORTED */
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1996-06-05 20:50:50 +00:00
/* Save the important info out of the png_struct, in case it is
* being used again.
*/
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2008-07-06 11:05:04 +00:00
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
2000-02-05 05:40:16 +00:00
#endif
1996-06-05 20:50:50 +00:00
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
error_ptr = png_ptr->error_ptr;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
1996-06-05 20:50:50 +00:00
2008-07-06 11:05:04 +00:00
png_memset(png_ptr, 0, png_sizeof(png_struct));
1996-06-05 20:50:50 +00:00
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
png_ptr->error_ptr = error_ptr;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr->free_fn = free_fn;
#endif
1996-06-05 20:50:50 +00:00
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2008-07-06 11:05:04 +00:00
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
2000-02-05 05:40:16 +00:00
#endif
1995-07-20 07:43:20 +00:00
}
1998-03-07 12:06:55 +00:00
2000-05-06 19:09:57 +00:00
void PNGAPI
1998-03-07 12:06:55 +00:00
png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
{
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
1998-03-07 12:06:55 +00:00
png_ptr->read_row_fn = read_row_fn;
}
2000-02-05 05:40:16 +00:00
2004-07-28 13:20:44 +00:00
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
2000-02-05 05:40:16 +00:00
#if defined(PNG_INFO_IMAGE_SUPPORTED)
2000-05-06 19:09:57 +00:00
void PNGAPI
png_read_png(png_structp png_ptr, png_infop info_ptr,
2000-02-05 05:40:16 +00:00
int transforms,
voidp params)
{
int row;
2009-05-20 17:43:52 +00:00
if (png_ptr == NULL)
return;
2000-02-05 05:40:16 +00:00
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* Invert the alpha channel from opacity to transparency
2004-08-04 11:34:52 +00:00
*/
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
png_set_invert_alpha(png_ptr);
#endif
2004-08-04 11:34:52 +00:00
/* png_read_info() gives us all of the information from the
2000-02-05 05:40:16 +00:00
* PNG file before the first IDAT (image data chunk).
*/
png_read_info(png_ptr, info_ptr);
2004-08-04 11:34:52 +00:00
if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
2008-07-06 11:05:04 +00:00
png_error(png_ptr, "Image is too high to process with png_read_png()");
2000-02-05 05:40:16 +00:00
/* -------------- image transformations start here ------------------- */
#if defined(PNG_READ_16_TO_8_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* Tell libpng to strip 16 bit/color files down to 8 bits per color.
2004-08-04 11:34:52 +00:00
*/
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_STRIP_16)
2009-05-20 17:43:52 +00:00
png_set_strip_16(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
2004-08-04 11:34:52 +00:00
/* Strip alpha bytes from the input data without combining with
* the background (not recommended).
2000-02-05 05:40:16 +00:00
*/
if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
2009-05-20 17:43:52 +00:00
png_set_strip_alpha(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
2000-02-18 19:48:52 +00:00
#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
2004-08-04 11:34:52 +00:00
/* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
2000-02-05 05:40:16 +00:00
* byte into separate bytes (useful for paletted and grayscale images).
*/
if (transforms & PNG_TRANSFORM_PACKING)
2009-05-20 17:43:52 +00:00
png_set_packing(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
/* Change the order of packed pixels to least significant bit first
2004-08-04 11:34:52 +00:00
* (not useful if you are using png_set_packing).
*/
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_PACKSWAP)
2009-05-20 17:43:52 +00:00
png_set_packswap(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
/* Expand paletted colors into true RGB triplets
* Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
* Expand paletted or RGB images with transparency to full alpha
* channels so the data will be available as RGBA quartets.
*/
if (transforms & PNG_TRANSFORM_EXPAND)
2009-05-20 17:43:52 +00:00
if ((png_ptr->bit_depth < 8) ||
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
2000-02-18 19:48:52 +00:00
png_set_expand(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
2004-08-04 11:34:52 +00:00
/* We don't handle background color or gamma transformation or dithering.
*/
2000-02-05 05:40:16 +00:00
#if defined(PNG_READ_INVERT_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* Invert monochrome files to have 0 as white and 1 as black
2004-08-04 11:34:52 +00:00
*/
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_INVERT_MONO)
2009-05-20 17:43:52 +00:00
png_set_invert_mono(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED)
/* If you want to shift the pixel values from the range [0,255] or
* [0,65535] to the original [0,7] or [0,31], or whatever range the
* colors were originally in:
*/
if ((transforms & PNG_TRANSFORM_SHIFT)
&& png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
{
png_color_8p sig_bit;
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_shift(png_ptr, sig_bit);
}
#endif
#if defined(PNG_READ_BGR_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* Flip the RGB pixels to BGR (or RGBA to BGRA)
2004-08-04 11:34:52 +00:00
*/
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_BGR)
2009-05-20 17:43:52 +00:00
png_set_bgr(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
2004-08-04 11:34:52 +00:00
*/
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_READ_SWAP_SUPPORTED)
2009-05-20 17:43:52 +00:00
/* Swap bytes of 16 bit files to least significant byte first
2004-08-04 11:34:52 +00:00
*/
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
2009-05-20 17:43:52 +00:00
png_set_swap(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
/* We don't handle adding filler bytes */
/* Optional call to gamma correct and add the background to the palette
* and update info structure. REQUIRED if you are expecting libpng to
2001-05-07 19:52:45 +00:00
* update the palette for you (i.e., you selected such a transform above).
2000-02-05 05:40:16 +00:00
*/
png_read_update_info(png_ptr, info_ptr);
/* -------------- image transformations end here ------------------- */
2000-05-01 14:31:54 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
2000-05-12 11:19:53 +00:00
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
2000-05-01 14:31:54 +00:00
#endif
2008-07-10 14:10:58 +00:00
if (info_ptr->row_pointers == NULL)
2000-02-18 19:48:52 +00:00
{
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
2004-07-28 13:20:44 +00:00
info_ptr->height * png_sizeof(png_bytep));
2009-03-21 13:10:28 +00:00
png_memset(info_ptr->row_pointers, 0, info_ptr->height
* png_sizeof(png_bytep));
2000-05-01 14:31:54 +00:00
#ifdef PNG_FREE_ME_SUPPORTED
2000-02-18 19:48:52 +00:00
info_ptr->free_me |= PNG_FREE_ROWS;
2000-05-01 14:31:54 +00:00
#endif
2009-02-04 19:11:41 +00:00
for (row = 0; row < (int)info_ptr->height; row++)
2001-05-07 19:52:45 +00:00
info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
2000-05-01 14:31:54 +00:00
png_get_rowbytes(png_ptr, info_ptr));
2000-02-18 19:48:52 +00:00
}
2000-02-05 05:40:16 +00:00
png_read_image(png_ptr, info_ptr->row_pointers);
info_ptr->valid |= PNG_INFO_IDAT;
2009-05-20 17:43:52 +00:00
/* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
2000-02-05 05:40:16 +00:00
png_read_end(png_ptr, info_ptr);
2000-03-21 11:13:06 +00:00
2009-05-20 17:43:52 +00:00
transforms = transforms; /* Quiet compiler warnings */
2007-05-21 18:27:47 +00:00
params = params;
2000-03-21 11:13:06 +00:00
2000-02-05 05:40:16 +00:00
}
2006-02-21 04:09:05 +00:00
#endif /* PNG_INFO_IMAGE_SUPPORTED */
2004-07-28 13:20:44 +00:00
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
2006-02-21 04:09:05 +00:00
#endif /* PNG_READ_SUPPORTED */