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(RPNG) Create png_reverse_filter_iterate

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This commit is contained in:
twinaphex 2015-03-13 20:53:28 +01:00
parent 6506f6ce85
commit a7e761c0d1
1 changed files with 28 additions and 17 deletions
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45
libretro-common/formats/png/rpng_decode_common.h
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@ -390,31 +390,42 @@ static int png_reverse_filter_copy_line(uint32_t *data, const struct png_ihdr *i
return 0;
}
static bool png_reverse_filter_iterate(uint32_t *data, const struct png_ihdr *ihdr,
struct rpng_process_t *pngp)
{
int ret = 1;
if (pngp->h < ihdr->height)
{
unsigned filter = *pngp->inflate_buf++;
pngp->restore_buf_size += 1;
ret = png_reverse_filter_copy_line(data,
ihdr, pngp, filter);
}
if (ret == 1 || ret == -1)
{
png_reverse_filter_deinit(pngp);
return ret;
}
pngp->h++;
pngp->inflate_buf += pngp->pitch;
pngp->restore_buf_size += pngp->pitch;
return 0;
}
static bool png_reverse_filter_regular(uint32_t *data, const struct png_ihdr *ihdr,
struct rpng_process_t *pngp)
{
int ret;
do{
ret = 1;
ret = png_reverse_filter_iterate(data, ihdr, pngp);
if (pngp->h < ihdr->height)
{
unsigned filter = *pngp->inflate_buf++;
pngp->restore_buf_size += 1;
ret = png_reverse_filter_copy_line(data,
ihdr, pngp, filter);
}
if (ret == 1 || ret == -1)
{
png_reverse_filter_deinit(pngp);
if (ret != 0)
break;
}
pngp->h++;
pngp->inflate_buf += pngp->pitch;
pngp->restore_buf_size += pngp->pitch;
data += ihdr->width;
}while(1);