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[libpng15] Replaced a short but frequently-used memcpy() in png_combine_row()

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with a loop.
This commit is contained in:
Glenn Randers-Pehrson
2011-10-05 21:09:22 -05:00
parent a92a212925
commit fa7d7934f6
3 changed files with 18 additions and 6 deletions
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16
pngrutil.c
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@@ -2994,11 +2994,21 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
{
if (m & mask)
{
png_memcpy(dp, sp, pixel_bytes);
/* Prior to libpng-1.5.6 we used memcpy(), but limited
* experiments show that this simple loop can be
* significantly faster.
*/
int j;
for (j = pixel_bytes; j; --j)
*(dp++) = *(sp++);
}
sp += pixel_bytes;
dp += pixel_bytes;
else
{
sp += pixel_bytes;
dp += pixel_bytes;
}
if (m == 1)
m = 0x80;