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H A Dpixman-minimal.he0c58720bfd8c0553f170b64717278b07438d2f5 Tue Nov 21 09:38:39 UTC 2023 Manos Pitsidianakis <manos.pitsidianakis@linaro.org> ui/pixman-minimal.h: fix empty allocation

In the minimal pixman API stub that is used when the real pixman
dependency is missing a NULL dereference happens when
virtio-gpu-rutabaga allocates a pixman image with bits = NULL and
rowstride_bytes = zero. A buffer of rowstride_bytes * height is
allocated which is NULL. However, in that scenario pixman calculates a
new stride value based on given width, height and format size.

This commit adds a helper function that performs the same logic as
pixman.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20231121093840.2121195-1-manos.pitsidianakis@linaro.org>