/* pngwrite.c - general routines to write a PNG file
*
- * libpng 1.2.6 - August 15, 2004
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.7 [December 15, 2011]
+ * Copyright (c) 1998-2011 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.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
*/
-/* get internal access to png.h */
-#define PNG_INTERNAL
-#include "png.h"
+#include "pngpriv.h"
+
#ifdef PNG_WRITE_SUPPORTED
/* Writes all the PNG information. This is the suggested way to use the
void PNGAPI
png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
{
- png_debug(1, "in png_write_info_before_PLTE\n");
+ png_debug(1, "in png_write_info_before_PLTE");
+
+ 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))
+ /* Write PNG signature */
+ png_write_sig(png_ptr);
+
+#ifdef 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\n");
- png_ptr->mng_features_permitted=0;
+ png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+ png_ptr->mng_features_permitted = 0;
}
#endif
- /* write IHDR information. */
+
+ /* 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,
- info_ptr->filter_type,
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- info_ptr->interlace_type);
+ info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
+ info_ptr->filter_type,
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+ info_ptr->interlace_type);
#else
- 0);
+ 0);
#endif
- /* the rest of these check to see if the valid field has the appropriate
- flag set, and if it does, writes the chunk. */
-#if defined(PNG_WRITE_gAMA_SUPPORTED)
+ /* The rest of these check to see if the valid field has the appropriate
+ * flag set, and if it does, writes the chunk.
+ */
+#ifdef 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
- }
+ png_write_gAMA_fixed(png_ptr, info_ptr->gamma);
#endif
-#if defined(PNG_WRITE_sRGB_SUPPORTED)
+#ifdef 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)
+
+#ifdef 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);
+ (png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
#endif
-#if defined(PNG_WRITE_sBIT_SUPPORTED)
+#ifdef 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)
+#ifdef 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
+ 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);
#endif
- }
-#endif
-#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
if (info_ptr->unknown_chunks_num)
{
- png_unknown_chunk *up;
+ png_unknown_chunk *up;
+
+ png_debug(5, "writing extra chunks");
- 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);
- 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)))
+ up->location &&
+ !(up->location & PNG_HAVE_PLTE) &&
+ !(up->location & PNG_HAVE_IDAT) &&
+ !(up->location & PNG_AFTER_IDAT) &&
+ ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
+ if (up->size == 0)
+ png_warning(png_ptr, "Writing zero-length unknown chunk");
+
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
- }
+ }
}
#endif
png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
int i;
#endif
- png_debug(1, "in png_write_info\n");
+ png_debug(1, "in png_write_info");
+
+ 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);
+ (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)
+#ifdef PNG_WRITE_tRNS_SUPPORTED
if (info_ptr->valid & PNG_INFO_tRNS)
+ {
+#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
+ /* Invert the alpha channel (in tRNS) */
+ if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
+ info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
- /* invert the alpha channel (in tRNS) */
- 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] = (png_byte)(255 - info_ptr->trans[j]);
- }
-#endif
- png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
- info_ptr->num_trans, info_ptr->color_type);
+ int j;
+ for (j = 0; j<(int)info_ptr->num_trans; j++)
+ info_ptr->trans_alpha[j] =
+ (png_byte)(255 - info_ptr->trans_alpha[j]);
}
#endif
-#if defined(PNG_WRITE_bKGD_SUPPORTED)
+ png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),
+ info_ptr->num_trans, info_ptr->color_type);
+ }
+#endif
+#ifdef PNG_WRITE_bKGD_SUPPORTED
if (info_ptr->valid & PNG_INFO_bKGD)
png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
#endif
-#if defined(PNG_WRITE_hIST_SUPPORTED)
+
+#ifdef PNG_WRITE_hIST_SUPPORTED
if (info_ptr->valid & PNG_INFO_hIST)
png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
#endif
-#if defined(PNG_WRITE_oFFs_SUPPORTED)
+
+#ifdef PNG_WRITE_oFFs_SUPPORTED
if (info_ptr->valid & PNG_INFO_oFFs)
png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
- info_ptr->offset_unit_type);
+ info_ptr->offset_unit_type);
#endif
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
+
+#ifdef PNG_WRITE_pCAL_SUPPORTED
if (info_ptr->valid & PNG_INFO_pCAL)
png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
- info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
- info_ptr->pcal_units, info_ptr->pcal_params);
+ 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)
+
+#ifdef 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.\n");
-#endif
-#endif
-#endif
-#if defined(PNG_WRITE_pHYs_SUPPORTED)
+#endif /* sCAL */
+
+#ifdef PNG_WRITE_pHYs_SUPPORTED
if (info_ptr->valid & PNG_INFO_pHYs)
png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
- info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
-#endif
-#if defined(PNG_WRITE_tIME_SUPPORTED)
+ info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
+#endif /* pHYs */
+
+#ifdef PNG_WRITE_tIME_SUPPORTED
if (info_ptr->valid & PNG_INFO_tIME)
{
png_write_tIME(png_ptr, &(info_ptr->mod_time));
png_ptr->mode |= PNG_WROTE_tIME;
}
-#endif
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
+#endif /* tIME */
+
+#ifdef 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)
+ for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+ png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
+#endif /* sPLT */
+
+#ifdef 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? */
+ png_debug2(2, "Writing header text chunk %d, type %d", 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);
+#ifdef 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\n");
+ 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 */
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
{
-#if defined(PNG_WRITE_zTXt_SUPPORTED)
- /* write compressed chunk */
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+ /* Write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, 0,
- info_ptr->text[i].compression);
+ 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;
}
+
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
-#if defined(PNG_WRITE_tEXt_SUPPORTED)
- /* write uncompressed chunk */
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+ /* Write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text,
- 0);
-#else
- png_warning(png_ptr, "Unable to write uncompressed text\n");
-#endif
+ info_ptr->text[i].text,
+ 0);
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+#else
+ /* Can't get here */
+ png_warning(png_ptr, "Unable to write uncompressed text");
+#endif
}
}
-#endif
-#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+#endif /* tEXt */
+
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
if (info_ptr->unknown_chunks_num)
{
- png_unknown_chunk *up;
+ png_unknown_chunk *up;
- png_debug(5, "writing extra chunks\n");
+ png_debug(5, "writing extra chunks");
- 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);
+ 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)))
+ up->location &&
+ (up->location & PNG_HAVE_PLTE) &&
+ !(up->location & PNG_HAVE_IDAT) &&
+ !(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
}
void PNGAPI
png_write_end(png_structp png_ptr, png_infop info_ptr)
{
- png_debug(1, "in png_write_end\n");
+ png_debug(1, "in png_write_end");
+
+ 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 */
+ /* See if user wants us to write information chunks */
if (info_ptr != NULL)
{
-#if defined(PNG_WRITE_TEXT_SUPPORTED)
+#ifdef 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 */
+#ifdef PNG_WRITE_tIME_SUPPORTED
+ /* Check to see if user has supplied a time chunk */
if ((info_ptr->valid & PNG_INFO_tIME) &&
- !(png_ptr->mode & PNG_WROTE_tIME))
+ !(png_ptr->mode & PNG_WROTE_tIME))
png_write_tIME(png_ptr, &(info_ptr->mod_time));
+
#endif
-#if defined(PNG_WRITE_TEXT_SUPPORTED)
- /* loop through comment chunks */
+#ifdef 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,
+ png_debug2(2, "Writing trailer text chunk %d, type %d", i,
info_ptr->text[i].compression);
- /* an internationalized chunk? */
+ /* 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);
+#ifdef 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\n");
+ 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;
+ /* 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 */
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+ /* Write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, 0,
- info_ptr->text[i].compression);
+ 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;
}
+
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
{
-#if defined(PNG_WRITE_tEXt_SUPPORTED)
- /* write uncompressed chunk */
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+ /* Write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, 0);
+ 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 */
}
}
#endif
-#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
if (info_ptr->unknown_chunks_num)
{
- png_unknown_chunk *up;
+ png_unknown_chunk *up;
- png_debug(5, "writing extra chunks\n");
+ png_debug(5, "writing extra chunks");
- 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);
+ 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)))
+ 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_ptr->mode |= PNG_AFTER_IDAT;
- /* write end of PNG file */
+ /* Write end of PNG file */
png_write_IEND(png_ptr);
-#if 0
-/* This flush, added in libpng-1.0.8, causes some applications to crash
- because they do not set png_ptr->output_flush_fn */
+ /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
+ * and restored again in libpng-1.2.30, may cause some applications that
+ * do not set png_ptr->output_flush_fn to crash. If your application
+ * experiences a problem, please try building libpng with
+ * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
+ * png-mng-implement at lists.sf.net .
+ */
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+# ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
png_flush(png_ptr);
+# endif
#endif
}
-#if defined(PNG_WRITE_tIME_SUPPORTED)
-#if !defined(_WIN32_WCE)
-/* "time.h" functions are not supported on WindowsCE */
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+/* "tm" structure is not supported on WindowsCE */
void PNGAPI
-png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
+png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime)
{
- png_debug(1, "in png_convert_from_struct_tm\n");
+ png_debug(1, "in png_convert_from_struct_tm");
+
ptime->year = (png_uint_16)(1900 + ttime->tm_year);
ptime->month = (png_byte)(ttime->tm_mon + 1);
ptime->day = (png_byte)ttime->tm_mday;
{
struct tm *tbuf;
- png_debug(1, "in png_convert_from_time_t\n");
+ png_debug(1, "in png_convert_from_time_t");
+
tbuf = gmtime(&ttime);
png_convert_from_struct_tm(ptime, tbuf);
}
#endif
-#endif
/* Initialize png_ptr structure, and allocate any memory needed */
-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)
+PNG_FUNCTION(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),PNG_ALLOCATED)
{
#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));
+ warn_fn, NULL, NULL, 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)
+static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */
+
+PNG_FUNCTION(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),PNG_ALLOCATED)
{
#endif /* PNG_USER_MEM_SUPPORTED */
+ volatile int png_cleanup_needed = 0;
+#ifdef PNG_SETJMP_SUPPORTED
+ volatile
+#endif
png_structp png_ptr;
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
- jmp_buf jmpbuf;
+ jmp_buf tmp_jmpbuf;
#endif
#endif
- int i;
- png_debug(1, "in png_create_write_struct\n");
+
+ png_debug(1, "in png_create_write_struct");
+
#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);
+ (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);
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
- png_init_mmx_flags(png_ptr); /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
-
- /* added at libpng-1.2.6 */
+ /* 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;
+ png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+ png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
#endif
#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))
+ if (setjmp(tmp_jmpbuf))
#else
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */
#endif
- {
- png_free(png_ptr, png_ptr->zbuf);
- png_ptr->zbuf=NULL;
- png_destroy_struct(png_ptr);
- return (NULL);
- }
#ifdef USE_FAR_KEYWORD
- png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
+ png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
#endif
+ PNG_ABORT();
#endif
#ifdef PNG_USER_MEM_SUPPORTED
#endif /* PNG_USER_MEM_SUPPORTED */
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
- i=0;
- do
- {
- 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)
- {
- sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
- user_png_ver);
- png_warning(png_ptr, msg);
- }
- sprintf(msg, "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");
- }
- }
+ if (!png_user_version_check(png_ptr, user_png_ver))
+ png_cleanup_needed = 1;
- /* initialize zbuf - compression buffer */
+ /* 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, 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, png_doublep_NULL, png_doublep_NULL);
-#endif
-
-#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 */
-#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 !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
- if(png_sizeof(png_struct) > png_struct_size ||
- png_sizeof(png_info) > png_info_size)
+ if (!png_cleanup_needed)
{
- char msg[80];
- png_ptr->warning_fn=NULL;
- if (user_png_ver)
- {
- sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
- user_png_ver);
- png_warning(png_ptr, msg);
- }
- sprintf(msg, "Application is running with png.c from libpng-%.20s",
- png_libpng_ver);
- png_warning(png_ptr, msg);
+ png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr,
+ png_ptr->zbuf_size);
+ if (png_ptr->zbuf == NULL)
+ png_cleanup_needed = 1;
}
-#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);
-}
-
-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;
- do
+ if (png_cleanup_needed)
{
- if (user_png_ver[i] != png_libpng_ver[i])
- {
-#ifdef PNG_LEGACY_SUPPORTED
- png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+ /* Clean up PNG structure and deallocate any memory. */
+ png_free(png_ptr, png_ptr->zbuf);
+ png_ptr->zbuf = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_destroy_struct_2((png_voidp)png_ptr,
+ (png_free_ptr)free_fn, (png_voidp)mem_ptr);
#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, 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, 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;
+ png_destroy_struct((png_voidp)png_ptr);
#endif
+ return (NULL);
+ }
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
- png_init_mmx_flags(png_ptr); /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
+ png_set_write_fn(png_ptr, NULL, NULL, NULL);
-#ifdef PNG_SETJMP_SUPPORTED
- /* restore jump buffer */
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+ png_reset_filter_heuristics(png_ptr);
#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);
-
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
- png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
- 1, png_doublep_NULL, png_doublep_NULL);
-#endif
+ return (png_ptr);
}
+
/* Write a few rows of image data. If the image is interlaced,
* either you will have to write the 7 sub images, or, if you
* have called png_set_interlace_handling(), you will have to
*/
void PNGAPI
png_write_rows(png_structp png_ptr, png_bytepp row,
- png_uint_32 num_rows)
+ png_uint_32 num_rows)
{
png_uint_32 i; /* row counter */
png_bytepp rp; /* row pointer */
- png_debug(1, "in png_write_rows\n");
- /* loop through the rows */
+ png_debug(1, "in png_write_rows");
+
+ if (png_ptr == NULL)
+ return;
+
+ /* Loop through the rows */
for (i = 0, rp = row; i < num_rows; i++, rp++)
{
png_write_row(png_ptr, *rp);
int pass, num_pass; /* pass variables */
png_bytepp rp; /* points to current row */
- png_debug(1, "in png_write_image\n");
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* intialize interlace handling. If image is not interlaced,
- this will set pass to 1 */
+ if (png_ptr == NULL)
+ return;
+
+ png_debug(1, "in png_write_image");
+
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+ /* Initialize interlace handling. If image is not interlaced,
+ * this will set pass to 1
+ */
num_pass = png_set_interlace_handling(png_ptr);
#else
num_pass = 1;
#endif
- /* loop through passes */
+ /* Loop through passes */
for (pass = 0; pass < num_pass; pass++)
{
- /* loop through image */
+ /* Loop through image */
for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
{
png_write_row(png_ptr, *rp);
}
}
-/* called by user to write a row of image data */
+/* Called by user to write a row of image data */
void PNGAPI
-png_write_row(png_structp png_ptr, png_bytep row)
+png_write_row(png_structp png_ptr, png_const_bytep row)
{
- png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
+ /* 1.5.6: moved from png_struct to be a local structure: */
+ png_row_info row_info;
+
+ if (png_ptr == NULL)
+ return;
+
+ png_debug2(1, "in png_write_row (row %u, pass %d)",
png_ptr->row_number, png_ptr->pass);
- /* initialize transformations and other stuff if first time */
+
+ /* 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.");
+ /* 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 */
+ /* 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.");
+ 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.");
+ 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.");
+#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.");
+ 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.");
+ 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.");
+ 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.");
+ 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);
}
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* if interlaced and not interested in row, return */
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+ /* If interlaced and not interested in row, return */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
return;
}
break;
+
case 1:
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
return;
}
break;
+
case 2:
if ((png_ptr->row_number & 0x07) != 4)
{
return;
}
break;
+
case 3:
if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
{
return;
}
break;
+
case 4:
if ((png_ptr->row_number & 0x03) != 2)
{
return;
}
break;
+
case 5:
if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
{
return;
}
break;
+
case 6:
if (!(png_ptr->row_number & 0x01))
{
return;
}
break;
+
+ default: /* error: ignore it */
+ break;
}
}
#endif
- /* set up row info for transformations */
- png_ptr->row_info.color_type = png_ptr->color_type;
- png_ptr->row_info.width = png_ptr->usr_width;
- png_ptr->row_info.channels = png_ptr->usr_channels;
- png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
- 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_ROWBYTES(png_ptr->row_info.pixel_depth,
- png_ptr->row_info.width);
+ /* Set up row info for transformations */
+ row_info.color_type = png_ptr->color_type;
+ row_info.width = png_ptr->usr_width;
+ row_info.channels = png_ptr->usr_channels;
+ row_info.bit_depth = png_ptr->usr_bit_depth;
+ row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels);
+ row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
- png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
- 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 = %lu\n", png_ptr->row_info.rowbytes);
+ png_debug1(3, "row_info->color_type = %d", row_info.color_type);
+ png_debug1(3, "row_info->width = %u", row_info.width);
+ png_debug1(3, "row_info->channels = %d", row_info.channels);
+ png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth);
+ png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth);
+ png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)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,
- png_ptr->row_info.rowbytes);
+ png_memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes);
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
- /* handle interlacing */
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
+ /* Handle interlacing */
if (png_ptr->interlaced && png_ptr->pass < 6 &&
- (png_ptr->transformations & PNG_INTERLACE))
+ (png_ptr->transformations & PNG_INTERLACE))
{
- png_do_write_interlace(&(png_ptr->row_info),
- png_ptr->row_buf + 1, png_ptr->pass);
- /* this should always get caught above, but still ... */
- if (!(png_ptr->row_info.width))
+ png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass);
+ /* This should always get caught above, but still ... */
+ if (!(row_info.width))
{
png_write_finish_row(png_ptr);
return;
}
#endif
- /* handle other transformations */
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
+ /* Handle other transformations */
if (png_ptr->transformations)
- png_do_write_transformations(png_ptr);
+ png_do_write_transformations(png_ptr, &row_info);
+#endif
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ /* At this point the row_info pixel depth must match the 'transformed' depth,
+ * which is also the output depth.
+ */
+ if (row_info.pixel_depth != png_ptr->pixel_depth ||
+ row_info.pixel_depth != png_ptr->transformed_pixel_depth)
+ png_error(png_ptr, "internal write transform logic error");
+
+#ifdef 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
* 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))
+ 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);
+ png_do_write_intrapixel(&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));
+ png_write_find_filter(png_ptr, &row_info);
if (png_ptr->write_row_fn != NULL)
(*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
}
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
/* Set the automatic flush interval or 0 to turn flushing off */
void PNGAPI
png_set_flush(png_structp png_ptr, int nrows)
{
- png_debug(1, "in png_set_flush\n");
+ png_debug(1, "in png_set_flush");
+
+ if (png_ptr == NULL)
+ return;
+
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
}
-/* flush the current output buffers now */
+/* Flush the current output buffers now */
void PNGAPI
png_write_flush(png_structp png_ptr)
{
int wrote_IDAT;
- png_debug(1, "in png_write_flush\n");
+ png_debug(1, "in png_write_flush");
+
+ if (png_ptr == NULL)
+ return;
+
/* We have already written out all of the data */
if (png_ptr->row_number >= png_ptr->num_rows)
- return;
+ return;
do
{
int ret;
- /* compress the data */
+ /* Compress the data */
ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
wrote_IDAT = 0;
- /* check for compression errors */
+ /* Check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
+
else
png_error(png_ptr, "zlib error");
}
if (!(png_ptr->zstream.avail_out))
{
- /* write the IDAT and reset the zlib output buffer */
- png_write_IDAT(png_ptr, png_ptr->zbuf,
- png_ptr->zbuf_size);
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ /* Write the IDAT and reset the zlib output buffer */
+ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
wrote_IDAT = 1;
}
- } while(wrote_IDAT == 1);
+ } while (wrote_IDAT == 1);
/* If there is any data left to be output, write it into a new IDAT */
if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
{
- /* write the IDAT and reset the zlib output buffer */
+ /* Write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf,
- png_ptr->zbuf_size - png_ptr->zstream.avail_out);
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ png_ptr->zbuf_size - png_ptr->zstream.avail_out);
}
png_ptr->flush_rows = 0;
png_flush(png_ptr);
}
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
-/* free all memory used by the write */
+/* Free all memory used by the write */
void PNGAPI
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
{
png_voidp mem_ptr = NULL;
#endif
- png_debug(1, "in png_destroy_write_struct\n");
+ png_debug(1, "in png_destroy_write_struct");
+
if (png_ptr_ptr != NULL)
- {
png_ptr = *png_ptr_ptr;
+
#ifdef PNG_USER_MEM_SUPPORTED
+ if (png_ptr != NULL)
+ {
free_fn = png_ptr->free_fn;
mem_ptr = png_ptr->mem_ptr;
-#endif
}
+#endif
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
if (info_ptr != NULL)
{
- png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
- if (png_ptr->num_chunk_list)
+ if (png_ptr != NULL)
{
- png_free(png_ptr, png_ptr->chunk_list);
- png_ptr->chunk_list=NULL;
- png_ptr->num_chunk_list=0;
- }
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+ if (png_ptr->num_chunk_list)
+ {
+ png_free(png_ptr, png_ptr->chunk_list);
+ 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);
+ (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
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);
+ (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)png_ptr);
#endif
png_write_destroy(png_structp png_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
- jmp_buf tmp_jmp; /* save jump buffer */
+ jmp_buf tmp_jmp; /* Save jump buffer */
#endif
png_error_ptr error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
png_error_ptr warning_fn;
+#endif
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 */
- deflateEnd(&png_ptr->zstream);
+ png_debug(1, "in png_write_destroy");
+
+ /* Free any memory zlib uses */
+ if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED)
+ deflateEnd(&png_ptr->zstream);
- /* free our memory. png_free checks NULL for us. */
+ /* Free our memory. png_free checks NULL for us. */
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->row_buf);
+#ifdef PNG_WRITE_FILTER_SUPPORTED
png_free(png_ptr, png_ptr->prev_row);
png_free(png_ptr, png_ptr->sub_row);
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
-#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);
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+ /* Use this to save a little code space, it doesn't free the filter_costs */
+ png_reset_filter_heuristics(png_ptr);
png_free(png_ptr, png_ptr->filter_costs);
png_free(png_ptr, png_ptr->inv_filter_costs);
#endif
#ifdef PNG_SETJMP_SUPPORTED
- /* reset structure */
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+ /* Reset structure */
+ png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf));
#endif
error_fn = png_ptr->error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
warning_fn = png_ptr->warning_fn;
+#endif
error_ptr = png_ptr->error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
- png_memset(png_ptr, 0, png_sizeof (png_struct));
+ png_memset(png_ptr, 0, png_sizeof(png_struct));
png_ptr->error_fn = error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
png_ptr->warning_fn = warning_fn;
+#endif
png_ptr->error_ptr = error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr->free_fn = free_fn;
#endif
#ifdef PNG_SETJMP_SUPPORTED
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+ png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf));
#endif
}
void PNGAPI
png_set_filter(png_structp png_ptr, int method, int filters)
{
- png_debug(1, "in png_set_filter\n");
-#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;
+ png_debug(1, "in png_set_filter");
+
+ if (png_ptr == NULL)
+ return;
+
+#ifdef 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))
{
+#ifdef PNG_WRITE_FILTER_SUPPORTED
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;
- default: png_ptr->do_filter = (png_byte)filters; break;
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
+ case PNG_FILTER_VALUE_NONE:
+ png_ptr->do_filter = PNG_FILTER_NONE; break;
+
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+ 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_WRITE_FILTER_SUPPORTED */
}
/* If we have allocated the row_buf, this means we have already started
*/
if (png_ptr->row_buf != NULL)
{
+#ifdef PNG_WRITE_FILTER_SUPPORTED
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->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Up filter after starting");
- png_ptr->do_filter &= ~PNG_FILTER_UP;
+ png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
+ ~PNG_FILTER_UP);
}
+
else
{
png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
- (png_ptr->rowbytes + 1));
+ (png_ptr->rowbytes + 1));
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
}
}
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Average filter after starting");
- png_ptr->do_filter &= ~PNG_FILTER_AVG;
+ png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
+ ~PNG_FILTER_AVG);
}
+
else
{
png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
- (png_ptr->rowbytes + 1));
+ (png_ptr->rowbytes + 1));
png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
}
}
png_warning(png_ptr, "Can't add Paeth filter after starting");
png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
}
+
else
{
png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
- (png_ptr->rowbytes + 1));
+ (png_ptr->rowbytes + 1));
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
}
if (png_ptr->do_filter == PNG_NO_FILTERS)
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
png_ptr->do_filter = PNG_FILTER_NONE;
}
}
* filtered data going to zlib more consistent, hopefully resulting in
* better compression.
*/
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
-void PNGAPI
-png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
- int num_weights, png_doublep filter_weights,
- png_doublep filter_costs)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */
+/* Convenience reset API. */
+static void
+png_reset_filter_heuristics(png_structp png_ptr)
{
- int i;
-
- png_debug(1, "in png_set_filter_heuristics\n");
- if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
+ /* Clear out any old values in the 'weights' - this must be done because if
+ * the app calls set_filter_heuristics multiple times with different
+ * 'num_weights' values we would otherwise potentially have wrong sized
+ * arrays.
+ */
+ png_ptr->num_prev_filters = 0;
+ png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
+ if (png_ptr->prev_filters != NULL)
{
- png_warning(png_ptr, "Unknown filter heuristic method");
- return;
+ png_bytep old = png_ptr->prev_filters;
+ png_ptr->prev_filters = NULL;
+ png_free(png_ptr, old);
}
-
- if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
+ if (png_ptr->filter_weights != NULL)
{
- heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
+ png_uint_16p old = png_ptr->filter_weights;
+ png_ptr->filter_weights = NULL;
+ png_free(png_ptr, old);
}
- if (num_weights < 0 || filter_weights == NULL ||
- heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
+ if (png_ptr->inv_filter_weights != NULL)
{
- num_weights = 0;
+ png_uint_16p old = png_ptr->inv_filter_weights;
+ png_ptr->inv_filter_weights = NULL;
+ png_free(png_ptr, old);
}
- png_ptr->num_prev_filters = (png_byte)num_weights;
- png_ptr->heuristic_method = (png_byte)heuristic_method;
+ /* Leave the filter_costs - this array is fixed size. */
+}
- if (num_weights > 0)
+static int
+png_init_filter_heuristics(png_structp png_ptr, int heuristic_method,
+ int num_weights)
+{
+ if (png_ptr == NULL)
+ return 0;
+
+ /* Clear out the arrays */
+ png_reset_filter_heuristics(png_ptr);
+
+ /* Check arguments; the 'reset' function makes the correct settings for the
+ * unweighted case, but we must handle the weight case by initializing the
+ * arrays for the caller.
+ */
+ if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
- if (png_ptr->prev_filters == NULL)
+ int i;
+
+ if (num_weights > 0)
{
png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(png_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++)
{
png_ptr->prev_filters[i] = 255;
}
- }
- if (png_ptr->filter_weights == NULL)
- {
png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
- (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
+ (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));
+ (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
+
for (i = 0; i < num_weights; i++)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
+
+ /* Safe to set this now */
+ png_ptr->num_prev_filters = (png_byte)num_weights;
}
+ /* If, in the future, there are other filter methods, this would
+ * need to be based on png_ptr->filter.
+ */
+ if (png_ptr->filter_costs == NULL)
+ {
+ 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)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+ }
+
+ for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+ {
+ png_ptr->inv_filter_costs[i] =
+ png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+ }
+
+ /* All the arrays are inited, safe to set this: */
+ png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED;
+
+ /* Return the 'ok' code. */
+ return 1;
+ }
+ else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT ||
+ heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
+ {
+ return 1;
+ }
+ else
+ {
+ png_warning(png_ptr, "Unknown filter heuristic method");
+ return 0;
+ }
+}
+
+/* Provide floating and fixed point APIs */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
+ int num_weights, png_const_doublep filter_weights,
+ png_const_doublep filter_costs)
+{
+ png_debug(1, "in png_set_filter_heuristics");
+
+ /* The internal API allocates all the arrays and ensures that the elements of
+ * those arrays are set to the default value.
+ */
+ if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
+ return;
+
+ /* If using the weighted method copy in the weights. */
+ if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
+ {
+ int i;
for (i = 0; i < num_weights; i++)
{
- if (filter_weights[i] < 0.0)
+ if (filter_weights[i] <= 0.0)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
+
else
{
png_ptr->inv_filter_weights[i] =
- (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
+ (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5);
+
png_ptr->filter_weights[i] =
- (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
+ (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5);
}
}
- }
- /* If, in the future, there are other filter methods, this would
- * need to be based on png_ptr->filter.
- */
- if (png_ptr->filter_costs == NULL)
- {
- 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)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
-
- for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+ /* Here is where we set the relative costs of the different filters. We
+ * should take the desired compression level into account when setting
+ * the costs, so that Paeth, for instance, has a high relative cost at low
+ * compression levels, while it has a lower relative cost at higher
+ * compression settings. The filter types are in order of increasing
+ * relative cost, so it would be possible to do this with an algorithm.
+ */
+ for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0)
{
png_ptr->inv_filter_costs[i] =
- png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+ (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5);
+
+ png_ptr->filter_costs[i] =
+ (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5);
}
}
+}
+#endif /* FLOATING_POINT */
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method,
+ int num_weights, png_const_fixed_point_p filter_weights,
+ png_const_fixed_point_p filter_costs)
+{
+ png_debug(1, "in png_set_filter_heuristics_fixed");
- /* Here is where we set the relative costs of the different filters. We
- * should take the desired compression level into account when setting
- * the costs, so that Paeth, for instance, has a high relative cost at low
- * compression levels, while it has a lower relative cost at higher
- * compression settings. The filter types are in order of increasing
- * relative cost, so it would be possible to do this with an algorithm.
+ /* The internal API allocates all the arrays and ensures that the elements of
+ * those arrays are set to the default value.
*/
- for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+ if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
+ return;
+
+ /* If using the weighted method copy in the weights. */
+ if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
- if (filter_costs == NULL || filter_costs[i] < 0.0)
+ int i;
+ for (i = 0; i < num_weights; i++)
{
- png_ptr->inv_filter_costs[i] =
- png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+ if (filter_weights[i] <= 0)
+ {
+ png_ptr->inv_filter_weights[i] =
+ png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
+ }
+
+ else
+ {
+ png_ptr->inv_filter_weights[i] = (png_uint_16)
+ ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1);
+
+ png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR*
+ PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]);
+ }
}
- else if (filter_costs[i] >= 1.0)
+
+ /* Here is where we set the relative costs of the different filters. We
+ * should take the desired compression level into account when setting
+ * the costs, so that Paeth, for instance, has a high relative cost at low
+ * compression levels, while it has a lower relative cost at higher
+ * compression settings. The filter types are in order of increasing
+ * relative cost, so it would be possible to do this with an algorithm.
+ */
+ for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+ if (filter_costs[i] >= PNG_FP_1)
{
- png_ptr->inv_filter_costs[i] =
- (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
- png_ptr->filter_costs[i] =
- (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
+ png_uint_32 tmp;
+
+ /* Use a 32 bit unsigned temporary here because otherwise the
+ * intermediate value will be a 32 bit *signed* integer (ANSI rules)
+ * and this will get the wrong answer on division.
+ */
+ tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2);
+ tmp /= filter_costs[i];
+
+ png_ptr->inv_filter_costs[i] = (png_uint_16)tmp;
+
+ tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF;
+ tmp /= PNG_FP_1;
+
+ png_ptr->filter_costs[i] = (png_uint_16)tmp;
}
}
}
+#endif /* FIXED_POINT */
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
void PNGAPI
png_set_compression_level(png_structp png_ptr, int level)
{
- png_debug(1, "in png_set_compression_level\n");
+ png_debug(1, "in png_set_compression_level");
+
+ if (png_ptr == NULL)
+ return;
+
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
png_ptr->zlib_level = level;
}
void PNGAPI
png_set_compression_mem_level(png_structp png_ptr, int mem_level)
{
- png_debug(1, "in png_set_compression_mem_level\n");
+ png_debug(1, "in png_set_compression_mem_level");
+
+ if (png_ptr == NULL)
+ return;
+
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
png_ptr->zlib_mem_level = mem_level;
}
void PNGAPI
png_set_compression_strategy(png_structp png_ptr, int strategy)
{
- png_debug(1, "in png_set_compression_strategy\n");
+ png_debug(1, "in png_set_compression_strategy");
+
+ if (png_ptr == NULL)
+ return;
+
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
png_ptr->zlib_strategy = strategy;
}
+/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
+ * smaller value of window_bits if it can do so safely.
+ */
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 */
+ /* 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;
- }
+ {
+ 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 PNGAPI
png_set_compression_method(png_structp png_ptr, int method)
{
- png_debug(1, "in png_set_compression_method\n");
+ png_debug(1, "in png_set_compression_method");
+
+ 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;
}
+/* The following were added to libpng-1.5.4 */
+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
+void PNGAPI
+png_set_text_compression_level(png_structp png_ptr, int level)
+{
+ png_debug(1, "in png_set_text_compression_level");
+
+ if (png_ptr == NULL)
+ return;
+
+ png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_LEVEL;
+ png_ptr->zlib_text_level = level;
+}
+
+void PNGAPI
+png_set_text_compression_mem_level(png_structp png_ptr, int mem_level)
+{
+ png_debug(1, "in png_set_text_compression_mem_level");
+
+ if (png_ptr == NULL)
+ return;
+
+ png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL;
+ png_ptr->zlib_text_mem_level = mem_level;
+}
+
+void PNGAPI
+png_set_text_compression_strategy(png_structp png_ptr, int strategy)
+{
+ png_debug(1, "in png_set_text_compression_strategy");
+
+ if (png_ptr == NULL)
+ return;
+
+ png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_STRATEGY;
+ png_ptr->zlib_text_strategy = strategy;
+}
+
+/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
+ * smaller value of window_bits if it can do so safely.
+ */
+void PNGAPI
+png_set_text_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, "Text compression window is being reset to 512");
+ window_bits = 9;
+ }
+
+#endif
+ png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS;
+ png_ptr->zlib_text_window_bits = window_bits;
+}
+
+void PNGAPI
+png_set_text_compression_method(png_structp png_ptr, int method)
+{
+ png_debug(1, "in png_set_text_compression_method");
+
+ 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_ZTXT_CUSTOM_METHOD;
+ png_ptr->zlib_text_method = method;
+}
+#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
+/* end of API added to libpng-1.5.4 */
+
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)
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
void PNGAPI
png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
- write_user_transform_fn)
+ write_user_transform_fn)
{
- png_debug(1, "in png_set_write_user_transform_fn\n");
+ png_debug(1, "in png_set_write_user_transform_fn");
+
+ 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)
+#ifdef PNG_INFO_IMAGE_SUPPORTED
void PNGAPI
png_write_png(png_structp png_ptr, png_infop info_ptr,
- int transforms, voidp params)
+ int transforms, voidp params)
{
-#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
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
/* 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 */
+#ifdef PNG_WRITE_INVERT_SUPPORTED
+ /* Invert monochrome pixels */
if (transforms & PNG_TRANSFORM_INVERT_MONO)
- png_set_invert_mono(png_ptr);
+ png_set_invert_mono(png_ptr);
#endif
-#if defined(PNG_WRITE_SHIFT_SUPPORTED)
+#ifdef 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);
+ && (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 */
+#ifdef 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 */
+#ifdef 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);
+ 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);
+#ifdef PNG_WRITE_FILLER_SUPPORTED
+ /* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */
+ if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
+ png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
+
+ else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
+ png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
#endif
-#if defined(PNG_WRITE_BGR_SUPPORTED)
- /* flip BGR pixels to RGB */
+#ifdef PNG_WRITE_BGR_SUPPORTED
+ /* Flip BGR pixels to RGB */
if (transforms & PNG_TRANSFORM_BGR)
- png_set_bgr(png_ptr);
+ png_set_bgr(png_ptr);
#endif
-#if defined(PNG_WRITE_SWAP_SUPPORTED)
- /* swap bytes of 16-bit files to most significant byte first */
+#ifdef 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);
+ png_set_swap(png_ptr);
#endif
-#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
- /* swap bits of 1, 2, 4 bit packed pixel formats */
+#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
+ /* Swap bits of 1, 2, 4 bit packed pixel formats */
if (transforms & PNG_TRANSFORM_PACKSWAP)
- png_set_packswap(png_ptr);
+ png_set_packswap(png_ptr);
+#endif
+
+#ifdef 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
/* ----------------------- end of transformations ------------------- */
- /* write the bits */
+ /* 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);
- if(transforms == 0 || params == NULL)
- /* quiet compiler warnings */ return;
+ PNG_UNUSED(transforms) /* Quiet compiler warnings */
+ PNG_UNUSED(params)
}
#endif
#endif /* PNG_WRITE_SUPPORTED */
projects / wxWidgets.git / blobdiff