-
+
/* pngwrite.c - general routines to write a PNG file
*
- * libpng 1.0.1
+ * Last changed in libpng 1.2.15 January 5, 2007
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, Glenn Randers-Pehrson
- * March 15, 1998
+ * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
/* get internal access to png.h */
#define PNG_INTERNAL
-#include "../png/png.h"
+#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
/* Writes all the PNG information. This is the suggested way to use the
* library. If you have a new chunk to add, make a function to write it,
* and put it in the correct location here. If you want the chunk written
- * after the image data, put it in png_write_end(). I strongly encurage
+ * after the image data, put it in png_write_end(). I strongly encourage
* you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
* the chunk, as that will keep the code from breaking if you want to just
* write a plain PNG file. If you have long comments, I suggest writing
* them in png_write_end(), and compressing them.
*/
-void
-png_write_info(png_structp png_ptr, png_infop info_ptr)
+void PNGAPI
+png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
- int i;
-#endif
-
- png_debug(1, "in png_write_info\n");
+ png_debug(1, "in png_write_info_before_PLTE\n");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+ {
png_write_sig(png_ptr); /* write PNG signature */
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
+ {
+ png_warning(png_ptr,"MNG features are not allowed in a PNG datastream");
+ png_ptr->mng_features_permitted=0;
+ }
+#endif
/* write IHDR information. */
png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
flag set, and if it does, writes the chunk. */
#if defined(PNG_WRITE_gAMA_SUPPORTED)
if (info_ptr->valid & PNG_INFO_gAMA)
+ {
+# ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_gAMA(png_ptr, info_ptr->gamma);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
+# endif
+#endif
+ }
#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
#endif
+#if defined(PNG_WRITE_iCCP_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_iCCP)
+ png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
+ info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
+#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sBIT)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
#endif
#if defined(PNG_WRITE_cHRM_SUPPORTED)
if (info_ptr->valid & PNG_INFO_cHRM)
+ {
+#ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_cHRM(png_ptr,
info_ptr->x_white, info_ptr->y_white,
info_ptr->x_red, info_ptr->y_red,
info_ptr->x_green, info_ptr->y_green,
info_ptr->x_blue, info_ptr->y_blue);
+#else
+# ifdef PNG_FIXED_POINT_SUPPORTED
+ png_write_cHRM_fixed(png_ptr,
+ info_ptr->int_x_white, info_ptr->int_y_white,
+ info_ptr->int_x_red, info_ptr->int_y_red,
+ info_ptr->int_x_green, info_ptr->int_y_green,
+ info_ptr->int_x_blue, info_ptr->int_y_blue);
+# endif
+#endif
+ }
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ if (info_ptr->unknown_chunks_num)
+ {
+ png_unknown_chunk *up;
+
+ png_debug(5, "writing extra chunks\n");
+
+ for (up = info_ptr->unknown_chunks;
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+ up++)
+ {
+ int keep=png_handle_as_unknown(png_ptr, up->name);
+ if (keep != PNG_HANDLE_CHUNK_NEVER &&
+ up->location && !(up->location & PNG_HAVE_PLTE) &&
+ !(up->location & PNG_HAVE_IDAT) &&
+ ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+ {
+ png_write_chunk(png_ptr, up->name, up->data, up->size);
+ }
+ }
+ }
#endif
+ png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
+ }
+}
+
+void PNGAPI
+png_write_info(png_structp png_ptr, png_infop info_ptr)
+{
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
+ int i;
+#endif
+
+ png_debug(1, "in png_write_info\n");
+
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
+ png_write_info_before_PLTE(png_ptr, info_ptr);
+
if (info_ptr->valid & PNG_INFO_PLTE)
png_write_PLTE(png_ptr, info_ptr->palette,
(png_uint_32)info_ptr->num_palette);
else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
- png_error(png_ptr, "Valid palette required for paletted images\n");
+ png_error(png_ptr, "Valid palette required for paletted images");
#if defined(PNG_WRITE_tRNS_SUPPORTED)
if (info_ptr->valid & PNG_INFO_tRNS)
{
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel (in tRNS) */
- if (png_ptr->transformations & PNG_INVERT_ALPHA &&
+ if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
int j;
for (j=0; j<(int)info_ptr->num_trans; j++)
- info_ptr->trans[j] = 255 - info_ptr->trans[j];
+ info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
}
#endif
png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
info_ptr->pcal_units, info_ptr->pcal_params);
#endif
+#if defined(PNG_WRITE_sCAL_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_sCAL)
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+ png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
+ info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
+ info_ptr->scal_s_width, info_ptr->scal_s_height);
+#else
+ png_warning(png_ptr,
+ "png_write_sCAL not supported; sCAL chunk not written.");
+#endif
+#endif
+#endif
#if defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_pHYs)
png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
if (info_ptr->valid & PNG_INFO_tIME)
{
png_write_tIME(png_ptr, &(info_ptr->mod_time));
- png_ptr->flags |= PNG_FLAG_WROTE_tIME;
+ png_ptr->mode |= PNG_WROTE_tIME;
}
#endif
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_sPLT_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_sPLT)
+ for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+ png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
+#endif
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* Check to see if we need to write text chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing header text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
+ /* an internationalized chunk? */
+ if (info_ptr->text[i].compression > 0)
+ {
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+ /* write international chunk */
+ png_write_iTXt(png_ptr,
+ info_ptr->text[i].compression,
+ info_ptr->text[i].key,
+ info_ptr->text[i].lang,
+ info_ptr->text[i].lang_key,
+ info_ptr->text[i].text);
+#else
+ png_warning(png_ptr, "Unable to write international text");
+#endif
+ /* Mark this chunk as written */
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+ }
/* If we want a compressed text chunk */
- if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+ else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length,
+ info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
- png_warning(png_ptr, "Unable to write compressed text\n");
+ png_warning(png_ptr, "Unable to write compressed text");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length);
+ info_ptr->text[i].text,
+ 0);
#else
- png_warning(png_ptr, "Unable to write uncompressed text\n");
+ png_warning(png_ptr, "Unable to write uncompressed text");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
}
#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ if (info_ptr->unknown_chunks_num)
+ {
+ png_unknown_chunk *up;
+
+ png_debug(5, "writing extra chunks\n");
+
+ for (up = info_ptr->unknown_chunks;
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+ up++)
+ {
+ int keep=png_handle_as_unknown(png_ptr, up->name);
+ if (keep != PNG_HANDLE_CHUNK_NEVER &&
+ up->location && (up->location & PNG_HAVE_PLTE) &&
+ !(up->location & PNG_HAVE_IDAT) &&
+ ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+ {
+ png_write_chunk(png_ptr, up->name, up->data, up->size);
+ }
+ }
+ }
+#endif
}
/* Writes the end of the PNG file. If you don't want to write comments or
* in png_write_info(), do not write them again here. If you have long
* comments, I suggest writing them here, and compressing them.
*/
-void
+void PNGAPI
png_write_end(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_write_end\n");
+ if (png_ptr == NULL)
+ return;
if (!(png_ptr->mode & PNG_HAVE_IDAT))
png_error(png_ptr, "No IDATs written into file");
/* see if user wants us to write information chunks */
if (info_ptr != NULL)
{
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
int i; /* local index variable */
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
/* check to see if user has supplied a time chunk */
- if (info_ptr->valid & PNG_INFO_tIME &&
- !(png_ptr->flags & PNG_FLAG_WROTE_tIME))
+ if ((info_ptr->valid & PNG_INFO_tIME) &&
+ !(png_ptr->mode & PNG_WROTE_tIME))
png_write_tIME(png_ptr, &(info_ptr->mod_time));
#endif
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* loop through comment chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
- if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+ /* an internationalized chunk? */
+ if (info_ptr->text[i].compression > 0)
+ {
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+ /* write international chunk */
+ png_write_iTXt(png_ptr,
+ info_ptr->text[i].compression,
+ info_ptr->text[i].key,
+ info_ptr->text[i].lang,
+ info_ptr->text[i].lang_key,
+ info_ptr->text[i].text);
+#else
+ png_warning(png_ptr, "Unable to write international text");
+#endif
+ /* Mark this chunk as written */
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+ }
+ else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length,
+ info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
- png_warning(png_ptr, "Unable to write compressed text\n");
+ png_warning(png_ptr, "Unable to write compressed text");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length);
+ info_ptr->text[i].text, 0);
#else
- png_warning(png_ptr, "Unable to write uncompressed text\n");
+ png_warning(png_ptr, "Unable to write uncompressed text");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
}
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ if (info_ptr->unknown_chunks_num)
+ {
+ png_unknown_chunk *up;
+
+ png_debug(5, "writing extra chunks\n");
+
+ for (up = info_ptr->unknown_chunks;
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+ up++)
+ {
+ int keep=png_handle_as_unknown(png_ptr, up->name);
+ if (keep != PNG_HANDLE_CHUNK_NEVER &&
+ up->location && (up->location & PNG_AFTER_IDAT) &&
+ ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+ {
+ png_write_chunk(png_ptr, up->name, up->data, up->size);
+ }
+ }
+ }
#endif
}
png_write_IEND(png_ptr);
}
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-/* Convert the supplied time into an RFC 1123 string suitable for use in
- * a "Creation Time" or other text-based time string.
- */
-png_charp
-png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
-{
- static PNG_CONST char short_months[12][4] =
- {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
-
- if (png_ptr->time_buffer == NULL)
- {
- png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
- sizeof(char)));
- }
-
-#ifdef USE_FAR_KEYWORD
- {
- char near_time_buf[29];
- sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
- ptime->day % 31, short_months[ptime->month - 1],
- ptime->year, ptime->hour % 24, ptime->minute % 60,
- ptime->second % 61);
- png_memcpy(png_ptr->time_buffer, near_time_buf,
- 29*sizeof(char));
- }
-#else
- sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
- ptime->day % 31, short_months[ptime->month - 1],
- ptime->year, ptime->hour % 24, ptime->minute % 60,
- ptime->second % 61);
-#endif
- return ((png_charp)png_ptr->time_buffer);
-}
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
-
#if defined(PNG_WRITE_tIME_SUPPORTED)
-void
+#if !defined(_WIN32_WCE)
+/* "time.h" functions are not supported on WindowsCE */
+void PNGAPI
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
{
png_debug(1, "in png_convert_from_struct_tm\n");
ptime->second = (png_byte)ttime->tm_sec;
}
-void
+void PNGAPI
png_convert_from_time_t(png_timep ptime, time_t ttime)
{
struct tm *tbuf;
png_convert_from_struct_tm(ptime, tbuf);
}
#endif
+#endif
/* Initialize png_ptr structure, and allocate any memory needed */
-png_structp
-png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
+png_structp PNGAPI
+png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn)
{
+#ifdef PNG_USER_MEM_SUPPORTED
+ return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
+ warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
+}
+
+/* Alternate initialize png_ptr structure, and allocate any memory needed */
+png_structp PNGAPI
+png_create_write_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 */
png_structp png_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
+#endif
+ int i;
png_debug(1, "in png_create_write_struct\n");
- if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
- {
- return ((png_structp)NULL);
- }
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+ (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
+#else
+ png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+#endif /* PNG_USER_MEM_SUPPORTED */
+ if (png_ptr == NULL)
+ return (NULL);
+
+ /* added at libpng-1.2.6 */
+#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
+
+#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
#endif
{
png_free(png_ptr, png_ptr->zbuf);
+ png_ptr->zbuf=NULL;
png_destroy_struct(png_ptr);
- return ((png_structp)NULL);
+ return (NULL);
}
#ifdef USE_FAR_KEYWORD
- png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+ png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
#endif
+#endif
+
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
+#endif /* PNG_USER_MEM_SUPPORTED */
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
- /* 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] ||
- (png_libpng_ver[0] == '0' && user_png_ver[2] < '9'))
+ i=0;
+ do
{
- png_error(png_ptr,
- "Incompatible libpng version in application and library");
+ if(user_png_ver[i] != png_libpng_ver[i])
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+ } while (png_libpng_ver[i++]);
+
+ if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+ {
+ /* 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] ||
+ (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+ (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+ {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ char msg[80];
+ if (user_png_ver)
+ {
+ png_snprintf(msg, 80,
+ "Application was compiled with png.h from libpng-%.20s",
+ user_png_ver);
+ png_warning(png_ptr, msg);
+ }
+ png_snprintf(msg, 80,
+ "Application is running with png.c from libpng-%.20s",
+ png_libpng_ver);
+ png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "Incompatible libpng version in application and library");
+ }
}
/* initialize zbuf - compression buffer */
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
- png_set_write_fn(png_ptr, NULL, NULL, NULL);
+ png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+ png_flush_ptr_NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
- 1, NULL, NULL);
+ 1, png_doublep_NULL, png_doublep_NULL);
#endif
- return ((png_structp)png_ptr);
+#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();
+ png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
+#else
+ if (setjmp(png_ptr->jmpbuf))
+ PNG_ABORT();
+#endif
+#endif
+ return (png_ptr);
}
-
/* Initialize png_ptr structure, and allocate any memory needed */
-void
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Deprecated. */
+#undef png_write_init
+void PNGAPI
png_write_init(png_structp png_ptr)
{
+ /* We only come here via pre-1.0.7-compiled applications */
+ png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
+}
+
+void PNGAPI
+png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
+ png_size_t png_struct_size, png_size_t png_info_size)
+{
+ /* We only come here via pre-1.0.12-compiled applications */
+ if(png_ptr == NULL) return;
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ if(png_sizeof(png_struct) > png_struct_size ||
+ png_sizeof(png_info) > png_info_size)
+ {
+ char msg[80];
+ png_ptr->warning_fn=NULL;
+ if (user_png_ver)
+ {
+ png_snprintf(msg, 80,
+ "Application was compiled with png.h from libpng-%.20s",
+ user_png_ver);
+ png_warning(png_ptr, msg);
+ }
+ png_snprintf(msg, 80,
+ "Application is running with png.c from libpng-%.20s",
+ png_libpng_ver);
+ png_warning(png_ptr, msg);
+ }
+#endif
+ if(png_sizeof(png_struct) > png_struct_size)
+ {
+ png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "The png struct allocated by the application for writing is too small.");
+ }
+ if(png_sizeof(png_info) > png_info_size)
+ {
+ png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "The info struct allocated by the application for writing is too small.");
+ }
+ png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+#endif /* PNG_1_0_X || PNG_1_2_X */
+
+
+void PNGAPI
+png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+ png_size_t png_struct_size)
+{
+ png_structp png_ptr=*ptr_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* to save current jump buffer */
+#endif
+
+ int i = 0;
+
+ if (png_ptr == NULL)
+ return;
- png_debug(1, "in png_write_init\n");
+ do
+ {
+ if (user_png_ver[i] != png_libpng_ver[i])
+ {
+#ifdef PNG_LEGACY_SUPPORTED
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#else
+ png_ptr->warning_fn=NULL;
+ png_warning(png_ptr,
+ "Application uses deprecated png_write_init() and should be recompiled.");
+ break;
+#endif
+ }
+ } while (png_libpng_ver[i++]);
+
+ png_debug(1, "in png_write_init_3\n");
+
+#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+#endif
+
+ if (png_sizeof(png_struct) > png_struct_size)
+ {
+ png_destroy_struct(png_ptr);
+ png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+ *ptr_ptr = png_ptr;
+ }
/* reset all variables to 0 */
- png_memset(png_ptr, 0, sizeof (png_struct));
+ png_memset(png_ptr, 0, png_sizeof (png_struct));
+
+ /* added at libpng-1.2.6 */
+#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
+#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+#endif
+
+ png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+ png_flush_ptr_NULL);
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
- png_set_write_fn(png_ptr, NULL, NULL, NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
- 1, NULL, NULL);
+ 1, png_doublep_NULL, png_doublep_NULL);
#endif
}
* have called png_set_interlace_handling(), you will have to
* "write" the image seven times.
*/
-void
+void PNGAPI
png_write_rows(png_structp png_ptr, png_bytepp row,
png_uint_32 num_rows)
{
png_bytepp rp; /* row pointer */
png_debug(1, "in png_write_rows\n");
+
+ if (png_ptr == NULL)
+ return;
+
/* loop through the rows */
for (i = 0, rp = row; i < num_rows; i++, rp++)
{
/* Write the image. You only need to call this function once, even
* if you are writing an interlaced image.
*/
-void
+void PNGAPI
png_write_image(png_structp png_ptr, png_bytepp image)
{
png_uint_32 i; /* row index */
int pass, num_pass; /* pass variables */
png_bytepp rp; /* points to current row */
+ if (png_ptr == NULL)
+ return;
+
png_debug(1, "in png_write_image\n");
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* intialize interlace handling. If image is not interlaced,
}
/* called by user to write a row of image data */
-void
+void PNGAPI
png_write_row(png_structp png_ptr, png_bytep row)
{
+ if (png_ptr == NULL)
+ return;
png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
png_ptr->row_number, png_ptr->pass);
+
/* initialize transformations and other stuff if first time */
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
+ /* make sure we wrote the header info */
+ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+ png_error(png_ptr,
+ "png_write_info was never called before png_write_row.");
+
+ /* check for transforms that have been set but were defined out */
+#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
+ if (png_ptr->transformations & PNG_INVERT_MONO)
+ png_warning(png_ptr, "PNG_WRITE_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_WRITE_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_WRITE_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_WRITE_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_WRITE_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_WRITE_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_WRITE_SWAP_SUPPORTED is not defined.");
+#endif
+
png_write_start_row(png_ptr);
}
switch (png_ptr->pass)
{
case 0:
- if (png_ptr->row_number & 7)
+ if (png_ptr->row_number & 0x07)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 1:
- if ((png_ptr->row_number & 7) || png_ptr->width < 5)
+ if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 2:
- if ((png_ptr->row_number & 7) != 4)
+ if ((png_ptr->row_number & 0x07) != 4)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 3:
- if ((png_ptr->row_number & 3) || png_ptr->width < 3)
+ if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 4:
- if ((png_ptr->row_number & 3) != 2)
+ if ((png_ptr->row_number & 0x03) != 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 5:
- if ((png_ptr->row_number & 1) || png_ptr->width < 2)
+ if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 6:
- if (!(png_ptr->row_number & 1))
+ if (!(png_ptr->row_number & 0x01))
{
png_write_finish_row(png_ptr);
return;
png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
png_ptr->row_info.channels);
- png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
- (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+ png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+ png_ptr->row_info.width);
png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
- png_debug1(3, "row_info->width = %d\n", png_ptr->row_info.width);
+ png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
- png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
+ png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
/* Copy user's row into buffer, leaving room for filter byte. */
png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
if (png_ptr->transformations)
png_do_write_transformations(png_ptr);
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ /* Write filter_method 64 (intrapixel differencing) only if
+ * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+ * 2. Libpng did not write a PNG signature (this filter_method is only
+ * used in PNG datastreams that are embedded in MNG datastreams) and
+ * 3. The application called png_permit_mng_features with a mask that
+ * included PNG_FLAG_MNG_FILTER_64 and
+ * 4. The filter_method is 64 and
+ * 5. The color_type is RGB or RGBA
+ */
+ if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+ {
+ /* Intrapixel differencing */
+ png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+ }
+#endif
+
/* Find a filter if necessary, filter the row and write it out. */
png_write_find_filter(png_ptr, &(png_ptr->row_info));
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
/* Set the automatic flush interval or 0 to turn flushing off */
-void
+void PNGAPI
png_set_flush(png_structp png_ptr, int nrows)
{
png_debug(1, "in png_set_flush\n");
+ if (png_ptr == NULL)
+ return;
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
}
/* flush the current output buffers now */
-void
+void PNGAPI
png_write_flush(png_structp png_ptr)
{
int wrote_IDAT;
png_debug(1, "in png_write_flush\n");
+ if (png_ptr == NULL)
+ return;
/* We have already written out all of the data */
if (png_ptr->row_number >= png_ptr->num_rows)
return;
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
/* free all memory used by the write */
-void
+void PNGAPI
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
{
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_free_ptr free_fn = NULL;
+ png_voidp mem_ptr = NULL;
+#endif
png_debug(1, "in png_destroy_write_struct\n");
if (png_ptr_ptr != NULL)
+ {
png_ptr = *png_ptr_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+ free_fn = png_ptr->free_fn;
+ mem_ptr = png_ptr->mem_ptr;
+#endif
+ }
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
if (info_ptr != NULL)
{
-#ifdef PNG_WRITE_tEXt_SUPPORTED
- png_free(png_ptr, info_ptr->text);
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
- png_free(png_ptr, info_ptr->pcal_purpose);
- png_free(png_ptr, info_ptr->pcal_units);
- if (info_ptr->pcal_params != NULL)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+ if (png_ptr->num_chunk_list)
{
- int i;
- for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
- {
- png_free(png_ptr, info_ptr->pcal_params[i]);
- }
- png_free(png_ptr, info_ptr->pcal_params);
+ png_free(png_ptr, png_ptr->chunk_list);
+ png_ptr->chunk_list=NULL;
+ png_ptr->num_chunk_list=0;
}
#endif
+
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+ (png_voidp)mem_ptr);
+#else
png_destroy_struct((png_voidp)info_ptr);
- *info_ptr_ptr = (png_infop)NULL;
+#endif
+ *info_ptr_ptr = NULL;
}
if (png_ptr != NULL)
{
png_write_destroy(png_ptr);
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+ (png_voidp)mem_ptr);
+#else
png_destroy_struct((png_voidp)png_ptr);
- *png_ptr_ptr = (png_structp)NULL;
+#endif
+ *png_ptr_ptr = NULL;
}
}
/* Free any memory used in png_ptr struct (old method) */
-void
+void /* PRIVATE */
png_write_destroy(png_structp png_ptr)
{
+#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* save jump buffer */
+#endif
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_free_ptr free_fn;
+#endif
png_debug(1, "in png_write_destroy\n");
/* free any memory zlib uses */
png_free(png_ptr, png_ptr->up_row);
png_free(png_ptr, png_ptr->avg_row);
png_free(png_ptr, png_ptr->paeth_row);
+
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
+
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_free(png_ptr, png_ptr->prev_filters);
png_free(png_ptr, png_ptr->filter_weights);
png_free(png_ptr, png_ptr->inv_filter_weights);
png_free(png_ptr, png_ptr->filter_costs);
png_free(png_ptr, png_ptr->inv_filter_costs);
-#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
/* reset structure */
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+#endif
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
error_ptr = png_ptr->error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+ free_fn = png_ptr->free_fn;
+#endif
- png_memset(png_ptr, 0, sizeof (png_struct));
+ png_memset(png_ptr, 0, png_sizeof (png_struct));
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
png_ptr->error_ptr = error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_ptr->free_fn = free_fn;
+#endif
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#ifdef PNG_SETJMP_SUPPORTED
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+#endif
}
/* Allow the application to select one or more row filters to use. */
-void
+void PNGAPI
png_set_filter(png_structp png_ptr, int method, int filters)
{
png_debug(1, "in png_set_filter\n");
- /* We allow 'method' only for future expansion of the base filter method. */
+ if (png_ptr == NULL)
+ return;
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ (method == PNG_INTRAPIXEL_DIFFERENCING))
+ method = PNG_FILTER_TYPE_BASE;
+#endif
if (method == PNG_FILTER_TYPE_BASE)
{
switch (filters & (PNG_ALL_FILTERS | 0x07))
{
+#ifndef PNG_NO_WRITE_FILTER
case 5:
case 6:
case 7: png_warning(png_ptr, "Unknown row filter for method 0");
- case PNG_FILTER_VALUE_NONE: png_ptr->do_filter=PNG_FILTER_NONE; break;
- case PNG_FILTER_VALUE_SUB: png_ptr->do_filter=PNG_FILTER_SUB; break;
- case PNG_FILTER_VALUE_UP: png_ptr->do_filter=PNG_FILTER_UP; break;
- case PNG_FILTER_VALUE_AVG: png_ptr->do_filter=PNG_FILTER_AVG; break;
- case PNG_FILTER_VALUE_PAETH: png_ptr->do_filter=PNG_FILTER_PAETH;break;
+#endif /* PNG_NO_WRITE_FILTER */
+ case PNG_FILTER_VALUE_NONE:
+ png_ptr->do_filter=PNG_FILTER_NONE; break;
+#ifndef PNG_NO_WRITE_FILTER
+ case PNG_FILTER_VALUE_SUB:
+ png_ptr->do_filter=PNG_FILTER_SUB; break;
+ case PNG_FILTER_VALUE_UP:
+ png_ptr->do_filter=PNG_FILTER_UP; break;
+ case PNG_FILTER_VALUE_AVG:
+ png_ptr->do_filter=PNG_FILTER_AVG; break;
+ case PNG_FILTER_VALUE_PAETH:
+ png_ptr->do_filter=PNG_FILTER_PAETH; break;
default: png_ptr->do_filter = (png_byte)filters; break;
+#else
+ default: png_warning(png_ptr, "Unknown row filter for method 0");
+#endif /* PNG_NO_WRITE_FILTER */
}
/* If we have allocated the row_buf, this means we have already started
*/
if (png_ptr->row_buf != NULL)
{
- if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL)
+#ifndef PNG_NO_WRITE_FILTER
+ if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
- if (png_ptr->do_filter & PNG_FILTER_UP && png_ptr->up_row == NULL)
+ if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
}
}
- if (png_ptr->do_filter & PNG_FILTER_AVG && png_ptr->avg_row == NULL)
+ if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
}
}
- if (png_ptr->do_filter & PNG_FILTER_PAETH &&
+ if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
png_ptr->paeth_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Paeth filter after starting");
- png_ptr->do_filter &= ~PNG_FILTER_PAETH;
+ png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
}
else
{
}
if (png_ptr->do_filter == PNG_NO_FILTERS)
+#endif /* PNG_NO_WRITE_FILTER */
png_ptr->do_filter = PNG_FILTER_NONE;
}
}
* better compression.
*/
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
-void
+void PNGAPI
png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
int num_weights, png_doublep filter_weights,
png_doublep filter_costs)
{
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
int i;
-#endif
png_debug(1, "in png_set_filter_heuristics\n");
+ if (png_ptr == NULL)
+ return;
if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
{
png_warning(png_ptr, "Unknown filter heuristic method");
num_weights = 0;
}
- png_ptr->num_prev_filters = num_weights;
- png_ptr->heuristic_method = heuristic_method;
+ png_ptr->num_prev_filters = (png_byte)num_weights;
+ png_ptr->heuristic_method = (png_byte)heuristic_method;
if (num_weights > 0)
{
if (png_ptr->prev_filters == NULL)
{
png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(sizeof(png_byte) * num_weights));
+ (png_uint_32)(png_sizeof(png_byte) * num_weights));
/* To make sure that the weighting starts out fairly */
for (i = 0; i < num_weights; i++)
if (png_ptr->filter_weights == NULL)
{
- png_ptr->filter_weights = (png_uint_16p) png_malloc(png_ptr,
- (png_uint_32)(sizeof(png_uint_16) * num_weights));
-
- png_ptr->inv_filter_weights = (png_uint_16p) png_malloc(png_ptr,
- (png_uint_32)(sizeof(png_uint_16) * num_weights));
+ png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
+ (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
+ png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
+ (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
for (i = 0; i < num_weights; i++)
{
png_ptr->inv_filter_weights[i] =
*/
if (png_ptr->filter_costs == NULL)
{
- png_ptr->filter_costs = (png_uint_16p) png_malloc(png_ptr,
- (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+ png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
+ (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
- png_ptr->inv_filter_costs = (png_uint_16p) png_malloc(png_ptr,
- (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+ png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
+ (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
{
}
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
-void
+void PNGAPI
png_set_compression_level(png_structp png_ptr, int level)
{
png_debug(1, "in png_set_compression_level\n");
+ if (png_ptr == NULL)
+ return;
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
png_ptr->zlib_level = level;
}
-void
+void PNGAPI
png_set_compression_mem_level(png_structp png_ptr, int mem_level)
{
png_debug(1, "in png_set_compression_mem_level\n");
+ if (png_ptr == NULL)
+ return;
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
png_ptr->zlib_mem_level = mem_level;
}
-void
+void PNGAPI
png_set_compression_strategy(png_structp png_ptr, int strategy)
{
png_debug(1, "in png_set_compression_strategy\n");
+ if (png_ptr == NULL)
+ return;
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
png_ptr->zlib_strategy = strategy;
}
-void
+void PNGAPI
png_set_compression_window_bits(png_structp png_ptr, int window_bits)
{
+ if (png_ptr == NULL)
+ return;
if (window_bits > 15)
png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
+ else if (window_bits < 8)
+ png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
+#ifndef WBITS_8_OK
+ /* avoid libpng bug with 256-byte windows */
+ if (window_bits == 8)
+ {
+ png_warning(png_ptr, "Compression window is being reset to 512");
+ window_bits=9;
+ }
+#endif
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
png_ptr->zlib_window_bits = window_bits;
}
-void
+void PNGAPI
png_set_compression_method(png_structp png_ptr, int method)
{
png_debug(1, "in png_set_compression_method\n");
+ if (png_ptr == NULL)
+ return;
if (method != 8)
png_warning(png_ptr, "Only compression method 8 is supported by PNG");
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
png_ptr->zlib_method = method;
}
-void
+void PNGAPI
png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
{
+ if (png_ptr == NULL)
+ return;
png_ptr->write_row_fn = write_row_fn;
}
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-void
+void PNGAPI
png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
write_user_transform_fn)
{
png_debug(1, "in png_set_write_user_transform_fn\n");
+ if (png_ptr == NULL)
+ return;
png_ptr->transformations |= PNG_USER_TRANSFORM;
png_ptr->write_user_transform_fn = write_user_transform_fn;
}
#endif
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void PNGAPI
+png_write_png(png_structp png_ptr, png_infop info_ptr,
+ int transforms, voidp params)
+{
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+ /* invert the alpha channel from opacity to transparency */
+ if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+ png_set_invert_alpha(png_ptr);
+#endif
+
+ /* Write the file header information. */
+ png_write_info(png_ptr, info_ptr);
+
+ /* ------ these transformations don't touch the info structure ------- */
+
+#if defined(PNG_WRITE_INVERT_SUPPORTED)
+ /* invert monochrome pixels */
+ if (transforms & PNG_TRANSFORM_INVERT_MONO)
+ png_set_invert_mono(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SHIFT_SUPPORTED)
+ /* Shift the pixels up to a legal bit depth and fill in
+ * as appropriate to correctly scale the image.
+ */
+ if ((transforms & PNG_TRANSFORM_SHIFT)
+ && (info_ptr->valid & PNG_INFO_sBIT))
+ png_set_shift(png_ptr, &info_ptr->sig_bit);
+#endif
+
+#if defined(PNG_WRITE_PACK_SUPPORTED)
+ /* pack pixels into bytes */
+ if (transforms & PNG_TRANSFORM_PACKING)
+ png_set_packing(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
+ /* swap location of alpha bytes from ARGB to RGBA */
+ if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+ png_set_swap_alpha(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_FILLER_SUPPORTED)
+ /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
+ * RGB (4 channels -> 3 channels). The second parameter is not used.
+ */
+ if (transforms & PNG_TRANSFORM_STRIP_FILLER)
+ png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
+#endif
+
+#if defined(PNG_WRITE_BGR_SUPPORTED)
+ /* flip BGR pixels to RGB */
+ if (transforms & PNG_TRANSFORM_BGR)
+ png_set_bgr(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SWAP_SUPPORTED)
+ /* swap bytes of 16-bit files to most significant byte first */
+ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+ png_set_swap(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+ /* swap bits of 1, 2, 4 bit packed pixel formats */
+ if (transforms & PNG_TRANSFORM_PACKSWAP)
+ png_set_packswap(png_ptr);
+#endif
+
+ /* ----------------------- end of transformations ------------------- */
+
+ /* write the bits */
+ if (info_ptr->valid & PNG_INFO_IDAT)
+ png_write_image(png_ptr, info_ptr->row_pointers);
+
+ /* It is REQUIRED to call this to finish writing the rest of the file */
+ png_write_end(png_ptr, info_ptr);
+
+ transforms = transforms; /* quiet compiler warnings */
+ params = params;
+}
+#endif
+#endif /* PNG_WRITE_SUPPORTED */
projects / wxWidgets.git / blobdiff