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Imported from libpng-1.0.9beta6.tar

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This commit is contained in:
Glenn Randers-Pehrson
2000-12-18 09:33:57 -06:00
parent 2ad31ae31f
commit 408b421265
48 changed files with 231 additions and 121 deletions
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23
pngwrite.c
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@@ -1,7 +1,7 @@
/* pngwrite.c - general routines to write a PNG file
*
* libpng 1.0.9beta5 - December 15, 2000
* libpng 1.0.9beta6 - December 18, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -28,6 +28,13 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
{
png_write_sig(png_ptr); /* write PNG signature */
#if defined(PNG_MNG_FEATURES_SUPPORTED)
if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
{
png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
png_ptr->mng_features_permitted=0;
}
#endif
/* write IHDR information. */
png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
@@ -774,6 +781,15 @@ png_write_row(png_structp png_ptr, png_bytep row)
png_do_write_transformations(png_ptr);
#if defined(PNG_MNG_FEATURES_SUPPORTED)
/* Write filter_method 64 (intrapixel differencing) only if
* 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
* 2. Libpng did not write a PNG signature (this filter_method is only
* used in PNG datastreams that are embedded in MNG datastreams) and
* 3. The application called png_permit_mng_features with a mask that
* included PNG_FLAG_MNG_FILTER_64 and
* 4. The filter_method is 64 and
* 5. The color_type is RGB or RGBA
*/
if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
{
@@ -977,6 +993,11 @@ 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;
#endif
if (method == PNG_FILTER_TYPE_BASE)
{
switch (filters & (PNG_ALL_FILTERS | 0x07))