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Commit 9eb732a32023e74c44ac8c3b5af9f5424273bb6c fixed crashing when
printing SkiaSalBitmaps to a non-Skia SalGraphics. However, the fix
almost always makes two copies of the SkiaSalBitmap's bitmap data: the
first copy is made in SkiaSalBitmap::AcquireBuffer() and then
QuartzSalBitmap makes a copy of the first copy.
By making QuartzSalBitmap's methods that return a CGImageRef pure
virtual, a non-Skia SalGraphics can now create a CGImageRef directly
from a SkiaSalBitmap's Skia bitmap data without copying to any
intermediate buffers.
Change-Id: If6ab7f175889cb4839d8a2461b7be7671e575c08
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/144856
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
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