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legacy-imlib2
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tillman's png interlacing support patch! yum! 

SVN revision: 8261
This commit is contained in:
Carsten Haitzler 2004-01-03 05:58:20 +00:00
parent f5df18e3b7
commit 18affb5b71
1 changed files with 58 additions and 44 deletions
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22
loaders/loader_png.c
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@ -252,7 +252,7 @@ save(ImlibImage * im, ImlibProgressFunction progress, char progress_granularity)
int pl = 0;
char pper = 0;
ImlibImageTag *tag;
int quality = 75, compression = 3;
int quality = 75, compression = 3, num_passes = 1, pass;
f = fopen(im->real_file, "wb");
if (!f)
@ -277,11 +277,21 @@ save(ImlibImage * im, ImlibProgressFunction progress, char progress_granularity)
png_destroy_info_struct(png_ptr, (png_infopp) & info_ptr);
return 0;
}
/* check whether we should use interlacing */
if ((tag = __imlib_GetTag(im, "interlacing")) && tag->val)
{
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
png_ptr->interlaced = PNG_INTERLACE_ADAM7;
num_passes = png_set_interlace_handling(png_ptr);
#endif
}
png_init_io(png_ptr, f);
if (im->flags & F_HAS_ALPHA)
{
png_set_IHDR(png_ptr, info_ptr, im->w, im->h, 8,
PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
PNG_COLOR_TYPE_RGB_ALPHA, png_ptr->interlaced,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
#ifdef WORDS_BIGENDIAN
png_set_swap_alpha(png_ptr);
@ -292,7 +302,7 @@ save(ImlibImage * im, ImlibProgressFunction progress, char progress_granularity)
else
{
png_set_IHDR(png_ptr, info_ptr, im->w, im->h, 8, PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
png_ptr->interlaced, PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
data = malloc(im->w * 3 * sizeof(char));
}
@ -339,7 +349,10 @@ save(ImlibImage * im, ImlibProgressFunction progress, char progress_granularity)
png_set_shift(png_ptr, &sig_bit);
png_set_packing(png_ptr);
for (pass = 0; pass < num_passes; pass++)
{
ptr = im->data;
for (y = 0; y < im->h; y++)
{
if (im->flags & F_HAS_ALPHA)
@ -360,7 +373,7 @@ save(ImlibImage * im, ImlibProgressFunction progress, char progress_granularity)
char per;
int l;
per = (char)((100 * y) / im->h);
per = 100 * (pass + y / (float) im->h) / num_passes;
if ((per - pper) >= progress_granularity)
{
l = y - pl;
@ -382,6 +395,7 @@ save(ImlibImage * im, ImlibProgressFunction progress, char progress_granularity)
}
ptr += im->w;
}
}
if (data)
free(data);
png_write_end(png_ptr, info_ptr);