Created attachment 119402 [details] Screencast of the artefact When using 16bpp color settings on Windows XP, artefacts appear, when dragging icons on the Desktop. The artefact appears as a black rectangle. How to reproduce: 1. Use Windows XP virtual machine. 2. Install QXL driver 3. Set Color Quality to 16bpp (Right click on the Desktop -> Properties -> Settings -> Color quality) 4. Drag around icons on the Desktop
Easy to reproduce. Does not depends on compression type. Looks like the mask is not sent correctly. Sometimes it's a black rectangle but sometimes you can see it's a 1 bit image corrupted. Looking at the code looks like these images are compressed differently (or not compressed) as for instance Quic does not support PLT images.
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