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Improve composite_image_general() performance

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This commit is contained in:
David Capello 2016-10-11 11:27:47 -03:00
parent 080e7e3f68
commit 0068a2024a
1 changed files with 13 additions and 14 deletions
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27
src/render/render.cpp
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@ -469,21 +469,20 @@ void composite_image_general(
int dstY = dstBounds.y;
for (int y=0; y<dstBounds.h; ++y, ++dstY) {
int dstX = dstBounds.x;
for (int x=0; x<dstBounds.w; ++x, ++dstX) {
int srcX = (srcBounds.x+x)/sx;
int srcY = (srcBounds.y+y)/sy;
int srcY = (srcBounds.y+y)/sy;
double srcX = srcBounds.x/sx;
double srcXDelta = 1.0/sx;
int oldSrcX;
if (srcX >= 0 && srcX < src->width() &&
srcY >= 0 && srcY < src->height() &&
dstX >= 0 && dstX < dst->width() &&
dstY >= 0 && dstY < dst->height()) {
put_pixel_fast<DstTraits>(
dst, dstX, dstY,
blender(get_pixel_fast<DstTraits>(dst, dstX, dstY),
get_pixel_fast<SrcTraits>(src, srcX, srcY),
opacity));
}
auto dstPtr = get_pixel_address_fast<DstTraits>(dst, dstBounds.x, dstY);
auto srcPtr = get_pixel_address_fast<SrcTraits>(src, int(srcX), srcY);
for (int x=0; x<dstBounds.w; ++x, ++dstPtr) {
*dstPtr = blender(*dstPtr, *srcPtr, opacity);
oldSrcX = srcX;
srcX += srcXDelta;
srcPtr += (int(srcX) - oldSrcX);
}
}
}