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video: prescale cleanup.

This commit is contained in:
feos-tas 2016-01-27 19:14:53 +00:00
parent 087750f62d
commit aabd53b10c
1 changed files with 7 additions and 7 deletions
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14
trunk/src/drivers/common/vidblit.cpp
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@ -576,23 +576,23 @@ void Blit8ToHigh(uint8 *src, uint8 *dest, int xr, int yr, int pitch, int xscale,
if (Bpp == 4) // are other modes really needed?
{
int mult = silt - 4; // magic assuming prescales are silt >= 6
uint32 *s = prescalebuf;
uint32 *d = (uint32 *)destbackup; // use 32-bit pointers ftw
int subpixel;
for (y=0; y<yr*yscale; y++)
{
int back = xr*(y%yscale>0); // bool as multiplier
for (x=0; x<xr; x++)
{
for (int subpixel=1; subpixel<=mult; subpixel++)
for (subpixel=0; subpixel<xscale; subpixel++)
{
*d++ = *s++;
if (subpixel < mult)
s--; // repeat subpixel
*d++ = *(s-back);
}
s++;
}
if (x == 256 && (y+1)%mult != 0)
s -= 256; // repeat scanline
if (back)
s -= xr;
}
}
return;