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png_reverse_filter_copy_line - optimization - paeth would always return

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'b' input value (and input is unsigned, so abs would have no effect), so
get rid of the paeth function call for the first loop iteration
This commit is contained in:
LibretroAdmin 2022-08-02 13:22:13 +02:00
parent 78f4e0abda
commit e6f3a387b2
1 changed files with 1 additions and 1 deletions
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2
libretro-common/formats/png/rpng.c
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@ -589,7 +589,7 @@ static int png_reverse_filter_copy_line(uint32_t *data, const struct png_ihdr *i
break;
case PNG_FILTER_PAETH:
for (i = 0; i < pngp->bpp; i++)
pngp->decoded_scanline[i] = paeth(0, pngp->prev_scanline[i], 0) + pngp->inflate_buf[i];
pngp->decoded_scanline[i] = pngp->prev_scanline[i] + pngp->inflate_buf[i];
for (i = pngp->bpp; i < pngp->pitch; i++)
pngp->decoded_scanline[i] = paeth(pngp->decoded_scanline[i - pngp->bpp],
pngp->prev_scanline[i], pngp->prev_scanline[i - pngp->bpp]) + pngp->inflate_buf[i];