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id = 2188
title = "virtio_gpu_gl_update_cursor_data() ignores the cursor resource's pixel format"
state = "opened"
created_at = "2024-02-23T06:44:34.223Z"
closed_at = "n/a"
labels = ["GUI", "device:graphics"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2188"
host-os = "Ubuntu 22.04.4"
host-arch = "x64"
qemu-version = "8.2.1"
guest-os = "AmigaOS (NOTE: OS doesn't matter)"
guest-arch = "PowerPC"
description = """The function virtio_gpu_gl_update_cursor_data() ignores the pixel format of the resource it's reading from. It literally uses memcpy() to copy the pointer data. This works just fins if both the guest OS and the display backend use the same pixel format.
The SDL backend seems to use a different pixel format to the GTK display backend. So, you'll get the correct colours in one, but not the other."""
reproduce = """1. Run a VM using Virtio GPU using the GTK backend. Set the guest OS' mouse pointer to one that's red instead of white, and note the mouse pointer's actual colour
2. Now run the same VM using the SDL display backend. Check the colour of the mouse pointer (that should be red)
NOTE: The choice of guest OS shouldn't matter."""
additional = "n/a"
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