mewin/libpng
1
0
Fork 0
mirror of https://git.code.sf.net/p/libpng/code.git synced 2025-07-10 18:04:09 +02:00
Code Issues Projects Releases Wiki Activity

Imported from libpng-0.99.tar

Browse Source
This commit is contained in:
Glenn Randers-Pehrson
1998-01-30 21:45:12 -06:00
parent c4a2ae6cac
commit 46f61e2398
25 changed files with 856 additions and 187 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
pngwrite.c
View File

@@ -1,12 +1,12 @@
/* pngwrite.c - general routines to write a PNG file
*
* libpng 0.98
* libpng 0.99
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* January 16, 1998
* January 30, 1998
*/
/* get internal access to png.h */
@@ -34,7 +34,12 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
/* 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, info_ptr->interlace_type);
info_ptr->filter_type,
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
info_ptr->interlace_type);
#else
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)
@@ -71,9 +76,9 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
if (png_ptr->transformations & PNG_INVERT_ALPHA &&
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
int i;
for (i=0; i<info_ptr->num_trans; i++)
info_ptr->trans[i] = 255 - info_ptr->trans[i];
int j;
for (j=0; j<info_ptr->num_trans; j++)
info_ptr->trans[j] = 255 - info_ptr->trans[j];
}
#endif
png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
@@ -315,7 +320,7 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size);
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
png_set_write_fn(png_ptr, NULL, NULL, NULL);
@@ -346,7 +351,7 @@ png_write_init(png_structp png_ptr)
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size);
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, png_ptr->zbuf_size);
png_set_write_fn(png_ptr, NULL, NULL, NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -386,9 +391,13 @@ png_write_image(png_structp png_ptr, png_bytepp image)
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 */
num_pass = png_set_interlace_handling(png_ptr);
#else
num_pass = 1;
#endif
/* loop through passes */
for (pass = 0; pass < num_pass; pass++)
{
@@ -749,7 +758,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
}
else
{
png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
png_ptr->rowbytes + 1);
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}