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libpng/pngwrite.c

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1998-12-29 17:47:59 +00:00
1997-05-16 07:46:07 +00:00
/* pngwrite.c - general routines to write a PNG file
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*
* Last changed in libpng 1.2.41 [November 2, 2009]
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
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*/
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/* Get internal access to png.h */
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#define PNG_INTERNAL
#include "png.h"
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#ifdef PNG_WRITE_SUPPORTED
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/* 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
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* after the image data, put it in png_write_end(). I strongly encourage
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* 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.
*/
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void PNGAPI
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png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
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{
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png_debug(1, "in png_write_info_before_PLTE");
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if (png_ptr == NULL || info_ptr == NULL)
return;
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if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
{
/* Write PNG signature */
png_write_sig(png_ptr);
#ifdef PNG_MNG_FEATURES_SUPPORTED
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if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
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{
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png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
png_ptr->mng_features_permitted = 0;
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}
#endif
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/* Write IHDR information. */
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png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
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info_ptr->filter_type,
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
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info_ptr->interlace_type);
#else
0);
#endif
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/* 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
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if (info_ptr->valid & PNG_INFO_gAMA)
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{
# ifdef PNG_FLOATING_POINT_SUPPORTED
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png_write_gAMA(png_ptr, info_ptr->gamma);
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#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
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# endif
#endif
}
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#endif
#ifdef PNG_WRITE_sRGB_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sRGB)
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png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
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#endif
#ifdef PNG_WRITE_iCCP_SUPPORTED
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if (info_ptr->valid & PNG_INFO_iCCP)
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png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
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info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
#endif
#ifdef PNG_WRITE_sBIT_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sBIT)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
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#endif
#ifdef PNG_WRITE_cHRM_SUPPORTED
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if (info_ptr->valid & PNG_INFO_cHRM)
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{
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#ifdef PNG_FLOATING_POINT_SUPPORTED
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png_write_cHRM(png_ptr,
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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);
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#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);
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# endif
#endif
}
#endif
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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if (info_ptr->unknown_chunks_num)
{
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png_unknown_chunk *up;
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png_debug(5, "writing extra chunks");
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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);
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if (keep != PNG_HANDLE_CHUNK_NEVER &&
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up->location && !(up->location & PNG_HAVE_PLTE) &&
!(up->location & PNG_HAVE_IDAT) &&
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((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
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if (up->size == 0)
png_warning(png_ptr, "Writing zero-length unknown chunk");
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png_write_chunk(png_ptr, up->name, up->data, up->size);
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}
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}
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}
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#endif
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png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
}
}
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void PNGAPI
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png_write_info(png_structp png_ptr, png_infop info_ptr)
{
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#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
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int i;
#endif
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png_debug(1, "in png_write_info");
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if (png_ptr == NULL || info_ptr == NULL)
return;
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png_write_info_before_PLTE(png_ptr, info_ptr);
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if (info_ptr->valid & PNG_INFO_PLTE)
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png_write_PLTE(png_ptr, info_ptr->palette,
(png_uint_32)info_ptr->num_palette);
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else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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png_error(png_ptr, "Valid palette required for paletted images");
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#ifdef PNG_WRITE_tRNS_SUPPORTED
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if (info_ptr->valid & PNG_INFO_tRNS)
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{
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
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/* 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++)
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info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
}
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#endif
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png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
info_ptr->num_trans, info_ptr->color_type);
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}
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#endif
#ifdef PNG_WRITE_bKGD_SUPPORTED
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if (info_ptr->valid & PNG_INFO_bKGD)
png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
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#endif
#ifdef PNG_WRITE_hIST_SUPPORTED
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if (info_ptr->valid & PNG_INFO_hIST)
png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
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#endif
#ifdef PNG_WRITE_oFFs_SUPPORTED
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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);
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#endif
#ifdef PNG_WRITE_pCAL_SUPPORTED
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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);
#endif
#ifdef PNG_sCAL_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sCAL)
#ifdef PNG_WRITE_sCAL_SUPPORTED
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
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png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
#else /* !FLOATING_POINT */
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#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
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info_ptr->scal_s_width, info_ptr->scal_s_height);
#endif /* FIXED_POINT */
#endif /* FLOATING_POINT */
#else /* !WRITE_sCAL */
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png_warning(png_ptr,
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"png_write_sCAL not supported; sCAL chunk not written.");
#endif /* WRITE_sCAL */
#endif /* sCAL */
#ifdef PNG_WRITE_pHYs_SUPPORTED
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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);
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#endif /* pHYs */
#ifdef PNG_WRITE_tIME_SUPPORTED
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if (info_ptr->valid & PNG_INFO_tIME)
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{
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png_write_tIME(png_ptr, &(info_ptr->mod_time));
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png_ptr->mode |= PNG_WROTE_tIME;
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}
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#endif /* tIME */
#ifdef PNG_WRITE_sPLT_SUPPORTED
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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);
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#endif /* sPLT */
#ifdef PNG_WRITE_TEXT_SUPPORTED
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/* Check to see if we need to write text chunks */
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for (i = 0; i < info_ptr->num_text; i++)
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{
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png_debug2(2, "Writing header text chunk %d, type %d", i,
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info_ptr->text[i].compression);
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/* An internationalized chunk? */
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if (info_ptr->text[i].compression > 0)
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{
#ifdef PNG_WRITE_iTXt_SUPPORTED
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/* Write international chunk */
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png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
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info_ptr->text[i].lang,
info_ptr->text[i].lang_key,
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info_ptr->text[i].text);
#else
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png_warning(png_ptr, "Unable to write international text");
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#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
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/* If we want a compressed text chunk */
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else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
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{
#ifdef PNG_WRITE_zTXt_SUPPORTED
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/* Write compressed chunk */
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png_write_zTXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text, 0,
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info_ptr->text[i].compression);
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#else
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png_warning(png_ptr, "Unable to write compressed text");
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#endif
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/* 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)
{
#ifdef PNG_WRITE_tEXt_SUPPORTED
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/* Write uncompressed chunk */
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png_write_tEXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text,
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0);
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/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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#else
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/* Can't get here */
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png_warning(png_ptr, "Unable to write uncompressed text");
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#endif
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}
}
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#endif /* tEXt */
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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if (info_ptr->unknown_chunks_num)
{
png_unknown_chunk *up;
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png_debug(5, "writing extra chunks");
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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);
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if (keep != PNG_HANDLE_CHUNK_NEVER &&
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up->location && (up->location & PNG_HAVE_PLTE) &&
!(up->location & PNG_HAVE_IDAT) &&
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((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
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}
#endif
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}
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/* Writes the end of the PNG file. If you don't want to write comments or
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* time information, you can pass NULL for info. If you already wrote these
* in png_write_info(), do not write them again here. If you have long
* comments, I suggest writing them here, and compressing them.
*/
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void PNGAPI
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png_write_end(png_structp png_ptr, png_infop info_ptr)
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{
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png_debug(1, "in png_write_end");
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if (png_ptr == NULL)
return;
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if (!(png_ptr->mode & PNG_HAVE_IDAT))
png_error(png_ptr, "No IDATs written into file");
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/* See if user wants us to write information chunks */
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if (info_ptr != NULL)
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{
#ifdef PNG_WRITE_TEXT_SUPPORTED
int i; /* local index variable */
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#endif
#ifdef PNG_WRITE_tIME_SUPPORTED
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/* Check to see if user has supplied a time chunk */
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if ((info_ptr->valid & PNG_INFO_tIME) &&
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!(png_ptr->mode & PNG_WROTE_tIME))
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png_write_tIME(png_ptr, &(info_ptr->mod_time));
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#endif
#ifdef PNG_WRITE_TEXT_SUPPORTED
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/* Loop through comment chunks */
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for (i = 0; i < info_ptr->num_text; i++)
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{
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png_debug2(2, "Writing trailer text chunk %d, type %d", i,
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info_ptr->text[i].compression);
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/* An internationalized chunk? */
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if (info_ptr->text[i].compression > 0)
{
#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);
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#else
png_warning(png_ptr, "Unable to write international text");
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#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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}
else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
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{
#ifdef PNG_WRITE_zTXt_SUPPORTED
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/* Write compressed chunk */
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png_write_zTXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text, 0,
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info_ptr->text[i].compression);
#else
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png_warning(png_ptr, "Unable to write compressed text");
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#endif
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/* 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)
{
#ifdef PNG_WRITE_tEXt_SUPPORTED
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/* Write uncompressed chunk */
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png_write_tEXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text, 0);
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#else
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png_warning(png_ptr, "Unable to write uncompressed text");
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#endif
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/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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}
}
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#endif
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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if (info_ptr->unknown_chunks_num)
{
png_unknown_chunk *up;
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png_debug(5, "writing extra chunks");
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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);
2004-08-08 02:42:49 +00:00
if (keep != PNG_HANDLE_CHUNK_NEVER &&
2000-02-05 05:40:16 +00:00
up->location && (up->location & PNG_AFTER_IDAT) &&
2004-08-08 02:42:49 +00:00
((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
2000-02-05 05:40:16 +00:00
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
1999-12-10 15:43:02 +00:00
png_write_chunk(png_ptr, up->name, up->data, up->size);
2000-02-05 05:40:16 +00:00
}
}
1999-12-10 15:43:02 +00:00
}
1995-12-19 09:22:19 +00:00
#endif
1995-07-20 07:43:20 +00:00
}
1996-06-05 20:50:50 +00:00
png_ptr->mode |= PNG_AFTER_IDAT;
2009-05-20 17:43:52 +00:00
/* Write end of PNG file */
1995-07-20 07:43:20 +00:00
png_write_IEND(png_ptr);
2008-07-06 11:05:04 +00:00
/* 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
2008-08-19 22:56:05 +00:00
* 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 . This kludge will be removed
* from libpng-1.4.0.
2008-07-06 11:05:04 +00:00
*/
2008-08-19 22:56:05 +00:00
#if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
2008-06-25 17:40:22 +00:00
png_flush(png_ptr);
2008-08-19 17:20:42 +00:00
#endif
1995-07-20 07:43:20 +00:00
}
#ifdef PNG_WRITE_tIME_SUPPORTED
#ifndef _WIN32_WCE
/* "tm" structure is not supported on WindowsCE */
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
1995-07-20 07:43:20 +00:00
{
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png_debug(1, "in png_convert_from_struct_tm");
1996-01-26 07:38:47 +00:00
ptime->year = (png_uint_16)(1900 + ttime->tm_year);
ptime->month = (png_byte)(ttime->tm_mon + 1);
ptime->day = (png_byte)ttime->tm_mday;
ptime->hour = (png_byte)ttime->tm_hour;
ptime->minute = (png_byte)ttime->tm_min;
ptime->second = (png_byte)ttime->tm_sec;
1995-07-20 07:43:20 +00:00
}
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_convert_from_time_t(png_timep ptime, time_t ttime)
1995-07-20 07:43:20 +00:00
{
struct tm *tbuf;
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_convert_from_time_t");
1995-07-20 07:43:20 +00:00
tbuf = gmtime(&ttime);
png_convert_from_struct_tm(ptime, tbuf);
}
1995-12-19 09:22:19 +00:00
#endif
2000-07-08 18:19:41 +00:00
#endif
1995-07-20 07:43:20 +00:00
1997-05-16 07:46:07 +00:00
/* Initialize png_ptr structure, and allocate any memory needed */
2000-05-06 19:09:57 +00:00
png_structp PNGAPI
1998-05-09 15:02:29 +00:00
png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
1997-01-17 07:34:35 +00:00
png_error_ptr error_fn, png_error_ptr warn_fn)
1996-06-05 20:50:50 +00:00
{
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#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
2001-10-27 12:35:13 +00:00
warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
1998-06-06 20:31:35 +00:00
}
/* Alternate initialize png_ptr structure, and allocate any memory needed */
2000-05-06 19:09:57 +00:00
png_structp PNGAPI
1998-06-06 20:31:35 +00:00
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 */
2008-08-03 02:04:34 +00:00
#ifdef PNG_SETJMP_SUPPORTED
volatile
2008-08-03 02:04:34 +00:00
#endif
png_structp png_ptr;
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
1997-01-17 07:34:35 +00:00
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
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#endif
1997-01-17 07:34:35 +00:00
#endif
2000-05-06 19:09:57 +00:00
int i;
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_create_write_struct");
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#ifdef PNG_USER_MEM_SUPPORTED
2002-02-22 05:14:23 +00:00
png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
(png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
1998-06-06 20:31:35 +00:00
#else
2002-02-22 05:14:23 +00:00
png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
1998-06-06 20:31:35 +00:00
#endif /* PNG_USER_MEM_SUPPORTED */
2002-02-22 05:14:23 +00:00
if (png_ptr == NULL)
2001-10-27 12:35:13 +00:00
return (NULL);
2000-02-05 05:40:16 +00:00
2009-05-20 17:43:52 +00:00
/* Added at libpng-1.2.6 */
2004-08-04 11:34:52 +00:00
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
2004-08-04 11:34:52 +00:00
#endif
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
1997-01-17 07:34:35 +00:00
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
1996-06-05 20:50:50 +00:00
if (setjmp(png_ptr->jmpbuf))
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#endif
1996-06-05 20:50:50 +00:00
{
1997-01-17 07:34:35 +00:00
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_destroy_struct((png_voidp)png_ptr);
#endif
2001-10-27 12:35:13 +00:00
return (NULL);
1996-06-05 20:50:50 +00:00
}
1997-01-17 07:34:35 +00:00
#ifdef USE_FAR_KEYWORD
2008-07-06 11:05:04 +00:00
png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
1997-01-17 07:34:35 +00:00
#endif
2000-02-05 05:40:16 +00:00
#endif
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
#endif /* PNG_USER_MEM_SUPPORTED */
1997-01-17 07:34:35 +00:00
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
1996-06-05 20:50:50 +00:00
2008-07-10 14:10:58 +00:00
if (user_png_ver)
1996-06-05 20:50:50 +00:00
{
i = 0;
do
{
if (user_png_ver[i] != png_libpng_ver[i])
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
} while (png_libpng_ver[i++]);
2008-02-06 16:32:29 +00:00
}
2000-05-04 02:06:11 +00:00
2000-05-06 19:09:57 +00:00
if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
2000-05-04 02:06:11 +00:00
{
#ifdef PNG_iTXt_SUPPORTED
png_size_t length;
#endif
2000-05-06 19:09:57 +00:00
/* 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] ||
2001-05-18 09:54:50 +00:00
(user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
2000-05-06 19:09:57 +00:00
(user_png_ver[0] == '0' && user_png_ver[2] < '9'))
{
#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
2001-06-23 13:03:17 +00:00
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);
2001-06-23 13:03:17 +00:00
}
2007-05-21 02:40:52 +00:00
png_snprintf(msg, 80,
"Application is running with png.c from libpng-%.20s",
2001-06-23 13:03:17 +00:00
png_libpng_ver);
png_warning(png_ptr, msg);
#endif
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
png_ptr->flags = 0;
2001-06-23 13:03:17 +00:00
#endif
2000-05-06 19:09:57 +00:00
png_error(png_ptr,
"Incompatible libpng version in application and library");
}
#ifdef PNG_iTXt_SUPPORTED
/* Any library mismatch is trouble for png_set_read() in
* libpng-1.2.41 and later 1.2.x, so we store the caller's
* library version string.
*/
length = (png_size_t)png_strlen(user_png_ver) + 1;
png_debug1(3, "allocating user_png_ver for png_ptr (%lu bytes)",
(unsigned long)length);
png_ptr->user_png_ver = (png_charp)png_malloc_warn(png_ptr,
(png_uint_32)length);
if (png_ptr->user_png_ver == NULL)
png_warning(png_ptr, "Could not store png_ptr->user_png_ver");
else
png_memcpy(png_ptr->user_png_ver, user_png_ver, length);
#endif /* PNG_iTXt_SUPPORTED */
2000-05-06 19:09:57 +00:00
}
2000-05-04 02:06:11 +00:00
2009-05-20 17:43:52 +00:00
/* Initialize zbuf - compression buffer */
1996-06-05 20:50:50 +00:00
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
1998-02-07 16:20:57 +00:00
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
1996-06-05 20:50:50 +00:00
2001-10-27 12:35:13 +00:00
png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
png_flush_ptr_NULL);
1996-06-05 20:50:50 +00:00
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
1998-01-01 13:13:13 +00:00
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
2001-10-27 12:35:13 +00:00
1, png_doublep_NULL, png_doublep_NULL);
1998-01-01 13:13:13 +00:00
#endif
2002-04-27 15:11:25 +00:00
#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.
*/
2002-04-27 15:11:25 +00:00
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
PNG_ABORT();
2008-07-06 11:05:04 +00:00
png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
2002-04-27 15:11:25 +00:00
#else
if (setjmp(png_ptr->jmpbuf))
PNG_ABORT();
#endif
#endif
return (png_ptr);
1996-06-05 20:50:50 +00:00
}
1997-05-16 07:46:07 +00:00
/* Initialize png_ptr structure, and allocate any memory needed */
2006-03-09 05:35:59 +00:00
#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
2006-02-21 04:09:05 +00:00
/* Deprecated. */
2000-05-04 02:06:11 +00:00
#undef png_write_init
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_write_init(png_structp png_ptr)
2000-05-04 02:06:11 +00:00
{
/* We only come here via pre-1.0.7-compiled applications */
2001-06-23 13:03:17 +00:00
png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
2000-05-04 02:06:11 +00:00
}
2000-05-06 19:09:57 +00:00
void PNGAPI
2000-05-04 02:06:11 +00:00
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)
1995-07-20 07:43:20 +00:00
{
2001-05-18 09:54:50 +00:00
/* We only come here via pre-1.0.12-compiled applications */
2008-07-10 14:10:58 +00:00
if (png_ptr == NULL) return;
#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
2008-07-10 14:10:58 +00:00
if (png_sizeof(png_struct) > png_struct_size ||
2004-07-28 13:20:44 +00:00
png_sizeof(png_info) > png_info_size)
2001-06-23 13:03:17 +00:00
{
char msg[80];
png_ptr->warning_fn = NULL;
2001-06-23 13:03:17 +00:00
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);
2001-06-23 13:03:17 +00:00
}
2007-05-21 02:40:52 +00:00
png_snprintf(msg, 80,
"Application is running with png.c from libpng-%.20s",
2001-06-23 13:03:17 +00:00
png_libpng_ver);
png_warning(png_ptr, msg);
}
#endif
2008-07-10 14:10:58 +00:00
if (png_sizeof(png_struct) > png_struct_size)
{
png_ptr->error_fn = NULL;
2001-06-23 13:03:17 +00:00
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
png_ptr->flags = 0;
2001-06-23 13:03:17 +00:00
#endif
png_error(png_ptr,
"The png struct allocated by the application for writing is too small.");
}
2008-07-10 14:10:58 +00:00
if (png_sizeof(png_info) > png_info_size)
{
png_ptr->error_fn = NULL;
2001-06-23 13:03:17 +00:00
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
png_ptr->flags = 0;
2001-06-23 13:03:17 +00:00
#endif
png_error(png_ptr,
"The info struct allocated by the application for writing is too small.");
}
2001-05-18 09:54:50 +00:00
png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
}
2006-02-21 04:09:05 +00:00
#endif /* PNG_1_0_X || PNG_1_2_X */
2001-05-18 09:54:50 +00:00
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;
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* to save current jump buffer */
2000-02-05 05:40:16 +00:00
#endif
2006-03-10 16:19:04 +00:00
2006-03-22 22:21:59 +00:00
int i = 0;
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
2000-05-04 02:06:11 +00:00
do
{
if (user_png_ver[i] != png_libpng_ver[i])
{
2000-05-06 19:09:57 +00:00
#ifdef PNG_LEGACY_SUPPORTED
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
2000-05-06 19:09:57 +00:00
#else
png_ptr->warning_fn = NULL;
png_warning(png_ptr,
2008-07-06 11:05:04 +00:00
"Application uses deprecated png_write_init() and should be recompiled.");
2000-05-06 19:09:57 +00:00
#endif
}
2000-05-04 02:06:11 +00:00
} while (png_libpng_ver[i++]);
2000-05-06 19:09:57 +00:00
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_write_init_3");
1996-01-26 07:38:47 +00:00
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Save jump buffer and error functions */
2008-07-06 11:05:04 +00:00
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
2000-02-05 05:40:16 +00:00
#endif
1996-01-26 07:38:47 +00:00
2004-07-28 13:20:44 +00:00
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;
}
2001-05-18 09:54:50 +00:00
2009-05-20 17:43:52 +00:00
/* Reset all variables to 0 */
2008-07-06 11:05:04 +00:00
png_memset(png_ptr, 0, png_sizeof(png_struct));
1996-06-05 20:50:50 +00:00
2009-05-20 17:43:52 +00:00
/* Added at libpng-1.2.6 */
2004-08-04 11:34:52 +00:00
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
2004-08-04 11:34:52 +00:00
#endif
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Restore jump buffer */
2008-07-06 11:05:04 +00:00
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
2000-02-05 05:40:16 +00:00
#endif
1995-07-20 07:43:20 +00:00
2001-10-27 12:35:13 +00:00
png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
png_flush_ptr_NULL);
2001-05-18 09:54:50 +00:00
2009-05-20 17:43:52 +00:00
/* Initialize zbuf - compression buffer */
1995-07-20 07:43:20 +00:00
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
1998-02-07 16:20:57 +00:00
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
1997-05-16 07:46:07 +00:00
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
2001-10-27 12:35:13 +00:00
1, png_doublep_NULL, png_doublep_NULL);
1997-05-16 07:46:07 +00:00
#endif
1995-07-20 07:43:20 +00:00
}
1998-01-01 13:13:13 +00:00
/* Write a few rows of image data. If the image is interlaced,
* either you will have to write the 7 sub images, or, if you
* have called png_set_interlace_handling(), you will have to
* "write" the image seven times.
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_write_rows(png_structp png_ptr, png_bytepp row,
1995-07-20 07:43:20 +00:00
png_uint_32 num_rows)
{
png_uint_32 i; /* row counter */
png_bytepp rp; /* row pointer */
1995-07-20 07:43:20 +00:00
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_write_rows");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
2009-05-20 17:43:52 +00:00
/* Loop through the rows */
1995-07-20 07:43:20 +00:00
for (i = 0, rp = row; i < num_rows; i++, rp++)
{
png_write_row(png_ptr, *rp);
}
}
1998-01-01 13:13:13 +00:00
/* Write the image. You only need to call this function once, even
* if you are writing an interlaced image.
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_write_image(png_structp png_ptr, png_bytepp image)
1995-07-20 07:43:20 +00:00
{
png_uint_32 i; /* row index */
int pass, num_pass; /* pass variables */
png_bytepp rp; /* points to current row */
1995-07-20 07:43:20 +00:00
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_write_image");
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Initialize interlace handling. If image is not interlaced,
* this will set pass to 1
*/
1995-07-20 07:43:20 +00:00
num_pass = png_set_interlace_handling(png_ptr);
1998-01-31 03:45:12 +00:00
#else
num_pass = 1;
#endif
2009-05-20 17:43:52 +00:00
/* Loop through passes */
1995-07-20 07:43:20 +00:00
for (pass = 0; pass < num_pass; pass++)
{
2009-05-20 17:43:52 +00:00
/* Loop through image */
1995-07-20 07:43:20 +00:00
for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
{
png_write_row(png_ptr, *rp);
}
}
}
2009-05-20 17:43:52 +00:00
/* Called by user to write a row of image data */
2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_write_row(png_structp png_ptr, png_bytep row)
1995-07-20 07:43:20 +00:00
{
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
2008-12-01 14:58:57 +00:00
png_debug2(1, "in png_write_row (row %ld, pass %d)",
1998-01-01 13:13:13 +00:00
png_ptr->row_number, png_ptr->pass);
2006-03-10 16:19:04 +00:00
2009-05-20 17:43:52 +00:00
/* Initialize transformations and other stuff if first time */
1995-12-19 09:22:19 +00:00
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
1995-07-20 07:43:20 +00:00
{
2009-05-20 17:43:52 +00:00
/* 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.");
2001-11-07 13:10:08 +00:00
2009-05-20 17:43:52 +00:00
/* Check for transforms that have been set but were defined out */
1998-05-02 17:52:25 +00:00
#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
2009-05-20 17:43:52 +00:00
if (png_ptr->transformations & PNG_INVERT_MONO)
png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
1998-05-02 17:52:25 +00:00
#endif
#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
2009-05-20 17:43:52 +00:00
if (png_ptr->transformations & PNG_FILLER)
png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
1998-05-02 17:52:25 +00:00
#endif
#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
2009-05-20 17:43:52 +00:00
if (png_ptr->transformations & PNG_PACKSWAP)
png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
1998-05-02 17:52:25 +00:00
#endif
#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
2009-05-20 17:43:52 +00:00
if (png_ptr->transformations & PNG_PACK)
png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
1998-05-02 17:52:25 +00:00
#endif
#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
2009-05-20 17:43:52 +00:00
if (png_ptr->transformations & PNG_SHIFT)
png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
1998-05-02 17:52:25 +00:00
#endif
#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
2009-05-20 17:43:52 +00:00
if (png_ptr->transformations & PNG_BGR)
png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
1998-05-02 17:52:25 +00:00
#endif
#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
2009-05-20 17:43:52 +00:00
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
1998-05-02 17:52:25 +00:00
#endif
1995-07-20 07:43:20 +00:00
png_write_start_row(png_ptr);
}
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
2009-05-20 17:43:52 +00:00
/* If interlaced and not interested in row, return */
1995-07-20 07:43:20 +00:00
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
{
1996-01-26 07:38:47 +00:00
case 0:
2000-02-05 05:40:16 +00:00
if (png_ptr->row_number & 0x07)
1995-07-20 07:43:20 +00:00
{
png_write_finish_row(png_ptr);
return;
}
break;
case 1:
2000-02-05 05:40:16 +00:00
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
1995-07-20 07:43:20 +00:00
{
png_write_finish_row(png_ptr);
return;
}
break;
case 2:
2000-02-05 05:40:16 +00:00
if ((png_ptr->row_number & 0x07) != 4)
1995-07-20 07:43:20 +00:00
{
png_write_finish_row(png_ptr);
1996-01-26 07:38:47 +00:00
return;
1995-07-20 07:43:20 +00:00
}
break;
case 3:
2000-02-05 05:40:16 +00:00
if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
1995-07-20 07:43:20 +00:00
{
png_write_finish_row(png_ptr);
return;
}
break;
case 4:
2000-02-05 05:40:16 +00:00
if ((png_ptr->row_number & 0x03) != 2)
1995-07-20 07:43:20 +00:00
{
png_write_finish_row(png_ptr);
return;
}
break;
case 5:
2000-02-05 05:40:16 +00:00
if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
1995-07-20 07:43:20 +00:00
{
png_write_finish_row(png_ptr);
return;
}
break;
case 6:
2000-02-05 05:40:16 +00:00
if (!(png_ptr->row_number & 0x01))
1995-07-20 07:43:20 +00:00
{
png_write_finish_row(png_ptr);
return;
}
break;
}
}
1995-12-19 09:22:19 +00:00
#endif
1995-07-20 07:43:20 +00:00
2009-05-20 17:43:52 +00:00
/* Set up row info for transformations */
1996-01-26 07:38:47 +00:00
png_ptr->row_info.color_type = png_ptr->color_type;
1995-07-20 07:43:20 +00:00
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;
1996-01-26 07:38:47 +00:00
png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
png_ptr->row_info.channels);
1998-02-07 16:20:57 +00:00
2004-08-04 11:34:52 +00:00
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
png_ptr->row_info.width);
1995-07-20 07:43:20 +00:00
2008-12-01 14:58:57 +00:00
png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
png_debug1(3, "row_info->width = %lu", png_ptr->row_info.width);
png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes);
1997-05-16 07:46:07 +00:00
/* Copy user's row into buffer, leaving room for filter byte. */
1998-02-09 02:56:40 +00:00
png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
1998-02-07 16:20:57 +00:00
png_ptr->row_info.rowbytes);
1995-07-20 07:43:20 +00:00
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Handle interlacing */
1995-07-20 07:43:20 +00:00
if (png_ptr->interlaced && png_ptr->pass < 6 &&
(png_ptr->transformations & PNG_INTERLACE))
{
png_do_write_interlace(&(png_ptr->row_info),
1996-01-26 07:38:47 +00:00
png_ptr->row_buf + 1, png_ptr->pass);
2009-05-20 17:43:52 +00:00
/* This should always get caught above, but still ... */
1995-07-20 07:43:20 +00:00
if (!(png_ptr->row_info.width))
{
png_write_finish_row(png_ptr);
return;
}
}
1995-12-19 09:22:19 +00:00
#endif
1995-07-20 07:43:20 +00:00
2009-05-20 17:43:52 +00:00
/* Handle other transformations */
1995-07-20 07:43:20 +00:00
if (png_ptr->transformations)
png_do_write_transformations(png_ptr);
#ifdef PNG_MNG_FEATURES_SUPPORTED
2000-12-18 15:33:57 +00:00
/* 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
*/
2008-07-10 14:10:58 +00:00
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
2000-12-15 14:54:42 +00:00
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
{
/* Intrapixel differencing */
png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
}
#endif
1997-05-16 07:46:07 +00:00
/* Find a filter if necessary, filter the row and write it out. */
1996-06-05 20:50:50 +00:00
png_write_find_filter(png_ptr, &(png_ptr->row_info));
1998-03-07 12:06:55 +00:00
if (png_ptr->write_row_fn != NULL)
(*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
1995-11-28 17:22:13 +00:00
}
#ifdef PNG_WRITE_FLUSH_SUPPORTED
1995-11-28 17:22:13 +00:00
/* Set the automatic flush interval or 0 to turn flushing off */
2000-05-06 19:09:57 +00:00
void PNGAPI
1996-01-16 07:51:56 +00:00
png_set_flush(png_structp png_ptr, int nrows)
1995-11-28 17:22:13 +00:00
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_set_flush");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1996-01-26 07:38:47 +00:00
png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
1995-11-28 17:22:13 +00:00
}
2009-05-20 17:43:52 +00:00
/* Flush the current output buffers now */
2000-05-06 19:09:57 +00:00
void PNGAPI
1996-01-16 07:51:56 +00:00
png_write_flush(png_structp png_ptr)
1995-11-28 17:22:13 +00:00
{
1996-01-26 07:38:47 +00:00
int wrote_IDAT;
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_write_flush");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1996-06-05 20:50:50 +00:00
/* We have already written out all of the data */
if (png_ptr->row_number >= png_ptr->num_rows)
2009-05-20 17:43:52 +00:00
return;
1996-01-26 07:38:47 +00:00
do
{
int ret;
2009-05-20 17:43:52 +00:00
/* Compress the data */
1997-01-17 07:34:35 +00:00
ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
1996-01-26 07:38:47 +00:00
wrote_IDAT = 0;
2009-05-20 17:43:52 +00:00
/* Check for compression errors */
1996-01-26 07:38:47 +00:00
if (ret != Z_OK)
{
1997-05-16 07:46:07 +00:00
if (png_ptr->zstream.msg != NULL)
1997-01-17 07:34:35 +00:00
png_error(png_ptr, png_ptr->zstream.msg);
1996-01-26 07:38:47 +00:00
else
png_error(png_ptr, "zlib error");
}
1997-05-16 07:46:07 +00:00
if (!(png_ptr->zstream.avail_out))
1996-01-26 07:38:47 +00:00
{
2009-05-20 17:43:52 +00:00
/* Write the IDAT and reset the zlib output buffer */
1996-01-26 07:38:47 +00:00
png_write_IDAT(png_ptr, png_ptr->zbuf,
png_ptr->zbuf_size);
1997-01-17 07:34:35 +00:00
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
1996-01-26 07:38:47 +00:00
wrote_IDAT = 1;
}
} while(wrote_IDAT == 1);
/* If there is any data left to be output, write it into a new IDAT */
1997-01-17 07:34:35 +00:00
if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
1996-01-26 07:38:47 +00:00
{
2009-05-20 17:43:52 +00:00
/* Write the IDAT and reset the zlib output buffer */
1996-01-26 07:38:47 +00:00
png_write_IDAT(png_ptr, png_ptr->zbuf,
1997-01-17 07:34:35 +00:00
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;
1996-01-26 07:38:47 +00:00
}
png_ptr->flush_rows = 0;
png_flush(png_ptr);
1995-07-20 07:43:20 +00:00
}
1995-11-28 17:22:13 +00:00
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
1995-07-20 07:43:20 +00:00
2009-05-20 17:43:52 +00:00
/* Free all memory used by the write */
2000-05-06 19:09:57 +00:00
void PNGAPI
1997-01-17 07:34:35 +00:00
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
1996-06-05 20:50:50 +00:00
{
1997-01-17 07:34:35 +00:00
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn = NULL;
2001-05-18 09:54:50 +00:00
png_voidp mem_ptr = NULL;
1998-06-06 20:31:35 +00:00
#endif
1997-01-17 07:34:35 +00:00
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_destroy_write_struct");
1997-05-16 07:46:07 +00:00
if (png_ptr_ptr != NULL)
1998-06-06 20:31:35 +00:00
{
1997-01-17 07:34:35 +00:00
png_ptr = *png_ptr_ptr;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
2002-04-07 21:35:38 +00:00
mem_ptr = png_ptr->mem_ptr;
1998-06-06 20:31:35 +00:00
#endif
}
1997-01-17 07:34:35 +00:00
2008-02-06 16:32:29 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr != NULL)
{
free_fn = png_ptr->free_fn;
mem_ptr = png_ptr->mem_ptr;
}
#endif
1997-05-16 07:46:07 +00:00
if (info_ptr_ptr != NULL)
1997-01-17 07:34:35 +00:00
info_ptr = *info_ptr_ptr;
1997-05-16 07:46:07 +00:00
if (info_ptr != NULL)
1996-06-05 20:50:50 +00:00
{
2008-02-06 16:32:29 +00:00
if (png_ptr != NULL)
{
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
2000-02-18 19:48:52 +00:00
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
2008-02-06 16:32:29 +00:00
if (png_ptr->num_chunk_list)
{
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->chunk_list = NULL;
2008-07-25 13:38:43 +00:00
png_ptr->num_chunk_list = 0;
2008-02-06 16:32:29 +00:00
}
2000-05-01 14:31:54 +00:00
#endif
2008-02-06 16:32:29 +00:00
}
1999-12-10 15:43:02 +00:00
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
2001-05-18 09:54:50 +00:00
png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
(png_voidp)mem_ptr);
1998-06-06 20:31:35 +00:00
#else
1997-01-17 07:34:35 +00:00
png_destroy_struct((png_voidp)info_ptr);
1998-06-06 20:31:35 +00:00
#endif
2001-10-27 12:35:13 +00:00
*info_ptr_ptr = NULL;
1996-06-05 20:50:50 +00:00
}
1997-05-16 07:46:07 +00:00
if (png_ptr != NULL)
1996-06-05 20:50:50 +00:00
{
1997-01-17 07:34:35 +00:00
png_write_destroy(png_ptr);
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
2001-05-18 09:54:50 +00:00
png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
(png_voidp)mem_ptr);
1998-06-06 20:31:35 +00:00
#else
1997-01-17 07:34:35 +00:00
png_destroy_struct((png_voidp)png_ptr);
1998-06-06 20:31:35 +00:00
#endif
2001-10-27 12:35:13 +00:00
*png_ptr_ptr = NULL;
1996-06-05 20:50:50 +00:00
}
}
1995-12-19 09:22:19 +00:00
1997-05-16 07:46:07 +00:00
/* Free any memory used in png_ptr struct (old method) */
2001-04-11 12:38:00 +00:00
void /* PRIVATE */
1995-12-19 09:22:19 +00:00
png_write_destroy(png_structp png_ptr)
1995-07-20 07:43:20 +00:00
{
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2009-05-20 17:43:52 +00:00
jmp_buf tmp_jmp; /* Save jump buffer */
2000-02-05 05:40:16 +00:00
#endif
1996-06-05 20:50:50 +00:00
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn;
#endif
1995-07-20 07:43:20 +00:00
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_write_destroy");
2009-05-20 17:43:52 +00:00
/* Free any memory zlib uses */
1997-01-17 07:34:35 +00:00
deflateEnd(&png_ptr->zstream);
1996-06-05 20:50:50 +00:00
2009-05-20 17:43:52 +00:00
/* Free our memory. png_free checks NULL for us. */
1997-01-17 07:34:35 +00:00
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->row_buf);
#ifdef PNG_WRITE_FILTER_SUPPORTED
1997-01-17 07:34:35 +00:00
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);
2007-11-20 02:02:11 +00:00
#endif
1999-12-10 15:43:02 +00:00
#ifdef PNG_TIME_RFC1123_SUPPORTED
1998-01-01 13:13:13 +00:00
png_free(png_ptr, png_ptr->time_buffer);
1999-12-10 15:43:02 +00:00
#endif
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
1997-05-16 07:46:07 +00:00
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);
1999-12-10 15:43:02 +00:00
#endif
1996-06-05 20:50:50 +00:00
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Reset structure */
2008-07-06 11:05:04 +00:00
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
2000-02-05 05:40:16 +00:00
#endif
1996-06-05 20:50:50 +00:00
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
error_ptr = png_ptr->error_ptr;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
1996-06-05 20:50:50 +00:00
/* New member added in libpng-1.2.41, will be removed from 1.4.0 */
#ifdef PNG_iTXt_SUPPORTED
png_free(png_ptr, png_ptr->user_png_ver);
#endif
2008-07-06 11:05:04 +00:00
png_memset(png_ptr, 0, png_sizeof(png_struct));
1996-06-05 20:50:50 +00:00
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
png_ptr->error_ptr = error_ptr;
1998-06-06 20:31:35 +00:00
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr->free_fn = free_fn;
#endif
1996-06-05 20:50:50 +00:00
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2008-07-06 11:05:04 +00:00
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
2000-02-05 05:40:16 +00:00
#endif
1995-09-26 10:22:39 +00:00
}
1996-06-05 20:50:50 +00:00
1997-05-16 07:46:07 +00:00
/* Allow the application to select one or more row filters to use. */
2000-05-06 19:09:57 +00:00
void PNGAPI
1996-06-05 20:50:50 +00:00
png_set_filter(png_structp png_ptr, int method, int filters)
1995-09-26 10:22:39 +00:00
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_set_filter");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
#ifdef PNG_MNG_FEATURES_SUPPORTED
2008-07-10 14:10:58 +00:00
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
2000-12-18 15:33:57 +00:00
(method == PNG_INTRAPIXEL_DIFFERENCING))
method = PNG_FILTER_TYPE_BASE;
#endif
1997-05-16 07:46:07 +00:00
if (method == PNG_FILTER_TYPE_BASE)
1996-06-05 20:50:50 +00:00
{
switch (filters & (PNG_ALL_FILTERS | 0x07))
{
#ifdef PNG_WRITE_FILTER_SUPPORTED
1996-06-05 20:50:50 +00:00
case 5:
case 6:
1997-05-16 07:46:07 +00:00
case 7: png_warning(png_ptr, "Unknown row filter for method 0");
#endif /* PNG_WRITE_FILTER_SUPPORTED */
2007-07-14 19:43:24 +00:00
case PNG_FILTER_VALUE_NONE:
png_ptr->do_filter = PNG_FILTER_NONE; break;
#ifdef PNG_WRITE_FILTER_SUPPORTED
2007-07-14 19:43:24 +00:00
case PNG_FILTER_VALUE_SUB:
png_ptr->do_filter = PNG_FILTER_SUB; break;
2007-07-14 19:43:24 +00:00
case PNG_FILTER_VALUE_UP:
png_ptr->do_filter = PNG_FILTER_UP; break;
2007-07-14 19:43:24 +00:00
case PNG_FILTER_VALUE_AVG:
png_ptr->do_filter = PNG_FILTER_AVG; break;
2007-07-14 19:43:24 +00:00
case PNG_FILTER_VALUE_PAETH:
png_ptr->do_filter = PNG_FILTER_PAETH; break;
1996-06-05 20:50:50 +00:00
default: png_ptr->do_filter = (png_byte)filters; break;
2007-07-14 19:43:24 +00:00
#else
default: png_warning(png_ptr, "Unknown row filter for method 0");
#endif /* PNG_WRITE_FILTER_SUPPORTED */
1996-06-05 20:50:50 +00:00
}
1997-05-16 07:46:07 +00:00
/* If we have allocated the row_buf, this means we have already started
* with the image and we should have allocated all of the filter buffers
* that have been selected. If prev_row isn't already allocated, then
* it is too late to start using the filters that need it, since we
* will be missing the data in the previous row. If an application
* wants to start and stop using particular filters during compression,
* it should start out with all of the filters, and then add and
* remove them after the start of compression.
1996-06-05 20:50:50 +00:00
*/
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if (png_ptr->row_buf != NULL)
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{
#ifdef PNG_WRITE_FILTER_SUPPORTED
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if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
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{
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png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
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(png_ptr->rowbytes + 1));
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png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
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}
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if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
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{
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if (png_ptr->prev_row == NULL)
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{
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png_warning(png_ptr, "Can't add Up filter after starting");
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png_ptr->do_filter &= ~PNG_FILTER_UP;
}
else
{
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png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
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(png_ptr->rowbytes + 1));
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png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
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}
}
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if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
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{
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if (png_ptr->prev_row == NULL)
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{
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png_warning(png_ptr, "Can't add Average filter after starting");
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png_ptr->do_filter &= ~PNG_FILTER_AVG;
}
else
{
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png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
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(png_ptr->rowbytes + 1));
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png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
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}
}
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if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
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png_ptr->paeth_row == NULL)
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{
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if (png_ptr->prev_row == NULL)
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{
png_warning(png_ptr, "Can't add Paeth filter after starting");
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png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
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}
else
{
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png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
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(png_ptr->rowbytes + 1));
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png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
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}
}
if (png_ptr->do_filter == PNG_NO_FILTERS)
#endif /* PNG_WRITE_FILTER_SUPPORTED */
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png_ptr->do_filter = PNG_FILTER_NONE;
}
}
else
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png_error(png_ptr, "Unknown custom filter method");
}
/* This allows us to influence the way in which libpng chooses the "best"
* filter for the current scanline. While the "minimum-sum-of-absolute-
* differences metric is relatively fast and effective, there is some
* question as to whether it can be improved upon by trying to keep the
* filtered data going to zlib more consistent, hopefully resulting in
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* better compression.
*/
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */
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void PNGAPI
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png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
int num_weights, png_doublep filter_weights,
png_doublep filter_costs)
{
int i;
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png_debug(1, "in png_set_filter_heuristics");
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if (png_ptr == NULL)
return;
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if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
{
png_warning(png_ptr, "Unknown filter heuristic method");
return;
}
if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
{
heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
}
if (num_weights < 0 || filter_weights == NULL ||
heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
{
num_weights = 0;
}
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png_ptr->num_prev_filters = (png_byte)num_weights;
png_ptr->heuristic_method = (png_byte)heuristic_method;
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if (num_weights > 0)
{
if (png_ptr->prev_filters == NULL)
{
png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
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(png_uint_32)(png_sizeof(png_byte) * num_weights));
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2001-04-20 15:32:10 +00:00
/* To make sure that the weighting starts out fairly */
for (i = 0; i < num_weights; i++)
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{
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png_ptr->prev_filters[i] = 255;
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}
}
if (png_ptr->filter_weights == NULL)
{
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png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
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(png_uint_32)(png_sizeof(png_uint_16) * num_weights));
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png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
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(png_uint_32)(png_sizeof(png_uint_16) * num_weights));
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for (i = 0; i < num_weights; i++)
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{
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png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
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}
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}
for (i = 0; i < num_weights; i++)
{
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_ptr->filter_weights[i] =
(png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
}
}
}
/* 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)
{
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png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
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(png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
1997-05-16 07:46:07 +00:00
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png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
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(png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
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for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
{
png_ptr->inv_filter_costs[i] =
png_ptr->filter_costs[i] = PNG_COST_FACTOR;
}
}
/* 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 == NULL || filter_costs[i] < 0.0)
{
png_ptr->inv_filter_costs[i] =
png_ptr->filter_costs[i] = PNG_COST_FACTOR;
}
else if (filter_costs[i] >= 1.0)
{
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);
}
}
1995-09-26 10:22:39 +00:00
}
1997-05-16 07:46:07 +00:00
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
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2000-05-06 19:09:57 +00:00
void PNGAPI
1995-12-19 09:22:19 +00:00
png_set_compression_level(png_structp png_ptr, int level)
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{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_set_compression_level");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
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png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
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png_ptr->zlib_level = level;
}
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void PNGAPI
1995-12-19 09:22:19 +00:00
png_set_compression_mem_level(png_structp png_ptr, int mem_level)
1995-09-26 10:22:39 +00:00
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_set_compression_mem_level");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1996-06-05 20:50:50 +00:00
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
1996-01-26 07:38:47 +00:00
png_ptr->zlib_mem_level = mem_level;
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}
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void PNGAPI
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png_set_compression_strategy(png_structp png_ptr, int strategy)
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{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_set_compression_strategy");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
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png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
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png_ptr->zlib_strategy = strategy;
}
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void PNGAPI
1995-12-19 09:22:19 +00:00
png_set_compression_window_bits(png_structp png_ptr, int window_bits)
1995-09-26 10:22:39 +00:00
{
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1996-06-05 20:50:50 +00:00
if (window_bits > 15)
png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
1999-09-17 17:27:26 +00:00
else if (window_bits < 8)
png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
1999-12-10 15:43:02 +00:00
#ifndef WBITS_8_OK
2009-05-20 17:43:52 +00:00
/* Avoid libpng bug with 256-byte windows */
1999-12-10 15:43:02 +00:00
if (window_bits == 8)
{
png_warning(png_ptr, "Compression window is being reset to 512");
window_bits = 9;
1999-12-10 15:43:02 +00:00
}
#endif
1996-06-05 20:50:50 +00:00
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
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png_ptr->zlib_window_bits = window_bits;
}
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void PNGAPI
1995-12-19 09:22:19 +00:00
png_set_compression_method(png_structp png_ptr, int method)
1995-09-26 10:22:39 +00:00
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_set_compression_method");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1996-06-05 20:50:50 +00:00
if (method != 8)
png_warning(png_ptr, "Only compression method 8 is supported by PNG");
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
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png_ptr->zlib_method = method;
1995-07-20 07:43:20 +00:00
}
2000-05-06 19:09:57 +00:00
void PNGAPI
1998-03-07 12:06:55 +00:00
png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
{
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1998-03-07 12:06:55 +00:00
png_ptr->write_row_fn = write_row_fn;
}
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
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void PNGAPI
1998-03-07 12:06:55 +00:00
png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
write_user_transform_fn)
{
2008-12-01 14:58:57 +00:00
png_debug(1, "in png_set_write_user_transform_fn");
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1998-03-07 12:06:55 +00:00
png_ptr->transformations |= PNG_USER_TRANSFORM;
png_ptr->write_user_transform_fn = write_user_transform_fn;
}
#endif
2000-02-05 05:40:16 +00:00
#ifdef PNG_INFO_IMAGE_SUPPORTED
2000-05-06 19:09:57 +00:00
void PNGAPI
png_write_png(png_structp png_ptr, png_infop info_ptr,
2000-05-12 11:19:53 +00:00
int transforms, voidp params)
2000-02-05 05:40:16 +00:00
{
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL || info_ptr == NULL)
return;
2000-02-05 05:40:16 +00:00
/* Write the file header information. */
png_write_info(png_ptr, info_ptr);
/* ------ these transformations don't touch the info structure ------- */
#ifdef PNG_WRITE_INVERT_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Invert monochrome pixels */
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_INVERT_MONO)
2009-05-20 17:43:52 +00:00
png_set_invert_mono(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#ifdef PNG_WRITE_SHIFT_SUPPORTED
2000-02-05 05:40:16 +00:00
/* 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))
2009-05-20 17:43:52 +00:00
png_set_shift(png_ptr, &info_ptr->sig_bit);
2000-02-05 05:40:16 +00:00
#endif
#ifdef PNG_WRITE_PACK_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Pack pixels into bytes */
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_PACKING)
png_set_packing(png_ptr);
#endif
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Swap location of alpha bytes from ARGB to RGBA */
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
2009-05-20 17:43:52 +00:00
png_set_swap_alpha(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#ifdef PNG_WRITE_FILLER_SUPPORTED
2008-12-10 13:24:58 +00:00
/* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
2009-05-20 17:43:52 +00:00
if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
2008-12-10 13:24:58 +00:00
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
2009-05-20 17:43:52 +00:00
else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
2008-12-10 13:24:58 +00:00
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
2000-02-05 05:40:16 +00:00
#endif
#ifdef PNG_WRITE_BGR_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Flip BGR pixels to RGB */
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_BGR)
2009-05-20 17:43:52 +00:00
png_set_bgr(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#ifdef PNG_WRITE_SWAP_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Swap bytes of 16-bit files to most significant byte first */
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
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png_set_swap(png_ptr);
2000-02-05 05:40:16 +00:00
#endif
#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
2009-05-20 17:43:52 +00:00
/* Swap bits of 1, 2, 4 bit packed pixel formats */
2000-02-05 05:40:16 +00:00
if (transforms & PNG_TRANSFORM_PACKSWAP)
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png_set_packswap(png_ptr);
2000-02-05 05:40:16 +00:00
#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
2000-02-05 05:40:16 +00:00
/* ----------------------- end of transformations ------------------- */
2009-05-20 17:43:52 +00:00
/* Write the bits */
2000-02-05 05:40:16 +00:00
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);
2000-03-21 11:13:06 +00:00
2009-05-20 17:43:52 +00:00
transforms = transforms; /* Quiet compiler warnings */
2007-05-21 18:27:47 +00:00
params = params;
2000-02-05 05:40:16 +00:00
}
#endif
2001-03-14 13:08:39 +00:00
#endif /* PNG_WRITE_SUPPORTED */