https://bugs.documentfoundation.org/show_bug.cgi?id=138068
--- Comment #32 from Luboš Luňák <[email protected]> ---
(In reply to Armin Le Grand from comment #30)
> Main problem seems to be that I preferred DrawTransformBitmapExDirect in
> vcl/source/outdev/bitmap.cxx cmpared to ther versions, that is the only
> thing that can influence stuff besides cairo.
I confirm, it's really just this part that causes the performance problem. So
https://gerrit.libreoffice.org/c/core/+/110716 should be enough for this
bugreport.
(In reply to Noel Grandin from comment #31)
> For reference, the Caolan caching I was talking about was commit
> 9f3926df5c2828ad3e8cfce2b4444b1c84352cf4, tdf#123165, which is pretty much
> the same bug as this one
That's not a Writer cache though, that's a cache for the best quality
BitmapEx::Scale() algorithm. So I assume what's happened was that Armin's patch
made DrawTransformBitmapExDirect() preferred to DrawBitmapEx() that does
BitmapEx::Scale() internally, but all backend implementations for
DrawTransformBitmapExDirect() except the Skia one use uncached and possibly
slow platform API for the scaling, hence the slowdown.
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