commit e9dfa816f7002c686ad155682a21a06ec6041b5f
author Noel Grandin <noel.grandin@collabora.co.uk> Mon Aug 28 14:19:58 2023 +0200
committer Noel Grandin <noel.grandin@collabora.co.uk> Mon Aug 28 18:14:59 2023 +0200
tree 37f05cb9da44cf631bbbcf9851e713b4fa9b0fd4
parent b7d5b8cee77e4cfd931cdbd6f4ba8673c6bbe490

tdf#156808 soft edge effect makes image (except for soft edge) disappear

This is clearly fallout from
     commit 81994cb2b8b32453a92bcb011830fcb884f22ff3
     Date:   Fri Apr 16 20:33:10 2021 +0200
     Convert internal vcl bitmap formats transparency->alpha (II)
And it clearly fixes the problem, but I'm not sure __why__ it fixes the
problem.

Change-Id: I805ed85dd22b2124328e6b4dba098c5f093aec55
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156198
Tested-by: Jenkins
Reviewed-by: Patrick Luby <plubius@neooffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

drawinglayer/source/primitive2d/softedgeprimitive2d.cxx

diff --git a/drawinglayer/source/primitive2d/softedgeprimitive2d.cxx b/drawinglayer/source/primitive2d/softedgeprimitive2d.cxx
index 27e265a..1da2f68 100644
--- a/drawinglayer/source/primitive2d/softedgeprimitive2d.cxx
+++ b/drawinglayer/source/primitive2d/softedgeprimitive2d.cxx
@@ -202,6 +202,7 @@ void SoftEdgePrimitive2D::create2DDecomposition(
        const AlphaMask blurMask(drawinglayer::primitive2d::ProcessAndBlurAlphaMask(
            aMask, -fDiscreteSoftRadius * fScale, fDiscreteSoftRadius * fScale, 0));
        aMask.BlendWith(blurMask);
        aMask.Invert();

        // The end result is the original bitmap with blurred 8-bit alpha mask
        BitmapEx result(aBitmapEx.GetBitmap(), aMask);