commit af34f4ea62d8aabbab5d4028034aa2482c16fe8a
author Noel Grandin <noel.grandin@collabora.co.uk> Thu Jul 06 10:52:07 2023 +0200
committer Noel Grandin <noel.grandin@collabora.co.uk> Thu Jul 06 14:29:00 2023 +0200
tree 4b6411039de766615c774b02a9c57d67f9c68cc3
parent f348425e0b9187f56370d9b76594872f935b4d8e

avoid skia assert and slow-path

Otherwise, several lines below, we might call
    mpAlphaVDev->GetBitmap
which will return no bitmap (because the resulting bitmap would be
empty).
And then either we will hit the assert a few lines lower, or we will go
into the very very slow path below.

Change-Id: I41a62cddef5e0a6822ca09ed954e3fe431ca0021
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/154097
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

vcl/source/outdev/bitmap.cxx

diff --git a/vcl/source/outdev/bitmap.cxx b/vcl/source/outdev/bitmap.cxx
index 8e453e8..239ec93 100644
--- a/vcl/source/outdev/bitmap.cxx
+++ b/vcl/source/outdev/bitmap.cxx
@@ -315,6 +315,8 @@ void OutputDevice::DrawDeviceAlphaBitmap( const Bitmap& rBmp, const AlphaMask& r

    if (aDstRect.Intersection(tools::Rectangle(aOutPt, aOutSz)).IsEmpty())
        return;
    if (ImplLogicToDevicePixel(aOutSz).IsEmpty()) // nothing to draw
        return;

    {
        Point aRelPt = aOutPt + Point(mnOutOffX, mnOutOffY);