gulong dstX, dstY, srcX, srcY;
gulong srcX1, srcX2, srcY1, srcY2;
gulong ratioX, ratioY;
-
+
ratioX = (srcW << FRACTION) / dstW;
ratioY = (srcH << FRACTION) / dstH;
-
+
srcY2 = 0;
for (dstY = 0; dstY < dstH; dstY++) {
srcY1 = srcY2;
srcY2 += ratioY;
-
+
srcX2 = 0;
for (dstX = 0; dstX < dstW; dstX++) {
gulong red = 0, green = 0, blue = 0, alpha = 0;
gulong portionX, portionY, portionXY, sumXY = 0;
RrPixel32 pixel;
-
+
srcX1 = srcX2;
srcX2 += ratioX;
-
+
for (srcY = srcY1; srcY < srcY2; srcY += (1UL << FRACTION)) {
if (srcY == srcY1) {
srcY = FLOOR(srcY);
portionY = srcY2 - srcY;
else
portionY = (1UL << FRACTION);
-
+
for (srcX = srcX1; srcX < srcX2; srcX += (1UL << FRACTION)) {
if (srcX == srcX1) {
srcX = FLOOR(srcX);
portionX = srcX2 - srcX;
else
portionX = (1UL << FRACTION);
-
+
portionXY = (portionX * portionY) >> FRACTION;
sumXY += portionXY;
-
+
pixel = *(src + (srcY >> FRACTION) * srcW
+ (srcX >> FRACTION));
red += ((pixel >> RrDefaultRedOffset) & 0xFF)
* portionXY;
}
}
-
+
g_assert(sumXY != 0);
red /= sumXY;
green /= sumXY;
blue /= sumXY;
alpha /= sumXY;
-
+
*dst++ = (red << RrDefaultRedOffset) |
(green << RrDefaultGreenOffset) |
(blue << RrDefaultBlueOffset) |
guchar alpha, r, g, b, bgr, bgg, bgb;
/* apply the rgba's opacity as well */
- alpha = ((*source >> RrDefaultAlphaOffset) * rgba->alpha >> 8) & 0xff;
+ alpha = ((*source >> RrDefaultAlphaOffset) * rgba->alpha) >> 8;
r = *source >> RrDefaultRedOffset;
g = *source >> RrDefaultGreenOffset;
b = *source >> RrDefaultBlueOffset;