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optimize scalign down routine for RGBA as well as RGB... 

SVN revision: 2369
This commit is contained in:
Carsten Haitzler 2000-03-28 23:20:37 +00:00
parent 0780bd87ac
commit dd9240debc
1 changed files with 17 additions and 13 deletions
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30
src/scale.c
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@ -506,6 +506,11 @@ __imlib_ScaleAARGBA(DATA32 **ypoints, int *xpoints, DATA32 *dest,
/* if we're scaling down horizontally & vertically */
else
{
int count;
DATA32 *pix;
int r, g, b, a;
int xp, xap, yap;
/* go through every scanline in the output buffer */
for (y = 0; y < dh; y++)
{
@ -514,30 +519,29 @@ __imlib_ScaleAARGBA(DATA32 **ypoints, int *xpoints, DATA32 *dest,
sptr = ypoints[dyy + y];
for (x = dxx; x < end; x++)
{
int r = 0, g = 0, b = 0, a = 0;
int count;
DATA32 *pix;
if ((XAP > 1) || (YAP > 1))
{
for (i = 0, j = 0; j < YAP; j++)
r = 0; g = 0; b = 0; a = 0; count = 0;
xp = xpoints[x];
ssptr = ypoints[dyy + y];
for (j = 0; j < YAP; j++)
{
ssptr = ypoints[dyy + y] + (j * sow);
for (i = 0; i < XAP; i++)
{
pix = &ssptr[xpoints[x] + i];
pix = &ssptr[xp + i];
r += R_VAL(pix);
g += G_VAL(pix);
b += B_VAL(pix);
a += A_VAL(pix);
}
count += i;
ssptr += sow;
}
count = (i * j);
r /= count;
g /= count;
b /= count;
a /= count;
*dptr++ = RGBA_COMPOSE(r, g, b, a);
R_VAL(dptr) = r / count;
G_VAL(dptr) = g / count;
B_VAL(dptr) = b / count;
A_VAL(dptr) = a / count;
dptr++;
}
else
*dptr++ = sptr[xpoints[x]];