Fixed QRasterPaintEngine::drawImage() for 1x1 source rectangles.

QRasterPaintEngine::drawImage() used an optimized code path when the
source rectangle was 1x1. It would sample the source image at the
source rectangle's top-left corner and use the sampled color to fill
the entire target rectangle. There were two bugs, however:

1) The sampled color was assumed to be non-premultiplied, so you could
   end up with premultiplying the color twice. This was fixed by
   avoiding premultiplying a second time if the source image has a
   premultiplied format.

2) Since the source rectangle is a QRectF, it could easily cross pixel
   boundaries even if it's 1x1. In this case, it is not correct to fill
   the target rectangle with a single color. This was fixed by checking
   if the entire source rectangle is contained in a single pixel before
   taking the optimized code path.

Task-number: 256950
Reviewed-by: Trond

0 files changed, 0 insertions, 0 deletions