commit c3073c81223e9bf0f499d9fd3cfa8a7e8cb497a5
author Patrick Luby <plubius@neooffice.org> Mon Oct 09 11:38:00 2023 -0400
committer Noel Grandin <noel.grandin@collabora.co.uk> Mon Oct 09 20:56:33 2023 +0200
tree 9edfc4fa0396e339e26271844c8bc72506a7e3b1
parent 0855520cced8662ba0a8cfdaccbe55a812b13c60

tdf#157502 and tdf#157652 invert alpha mask

Due to the switch from transparency to alpha in commit
81994cb2b8b32453a92bcb011830fcb884f22ff3, invert the alpha
mask.

Change-Id: Ib6df3523be36ba5d5aaf3887557d4a6a8fa6098c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/157731
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

drawinglayer/source/primitive2d/glowprimitive2d.cxx

diff --git a/drawinglayer/source/primitive2d/glowprimitive2d.cxx b/drawinglayer/source/primitive2d/glowprimitive2d.cxx
index 8504b1a..c49ea68 100644
--- a/drawinglayer/source/primitive2d/glowprimitive2d.cxx
+++ b/drawinglayer/source/primitive2d/glowprimitive2d.cxx
@@ -205,9 +205,15 @@ void GlowPrimitive2D::create2DDecomposition(
            // When blurring a sharp boundary (our case), it gets 50% of original intensity, and
            // fades to both sides by the blur radius; thus blur radius is half of glow radius.
            // Consider glow transparency (initial transparency near the object edge)
            const AlphaMask mask(ProcessAndBlurAlphaMask(aAlpha, fDiscreteGlowRadius * fScale / 2.0,
                                                         fDiscreteGlowRadius * fScale / 2.0,
                                                         255 - getGlowColor().GetAlpha()));
            AlphaMask mask(ProcessAndBlurAlphaMask(aAlpha, fDiscreteGlowRadius * fScale / 2.0,
                                                   fDiscreteGlowRadius * fScale / 2.0,
                                                   255 - getGlowColor().GetAlpha()));

            // tdf#157502 and tdf#157652 invert alpha mask
            // Due to the switch from transparency to alpha in commit
            // 81994cb2b8b32453a92bcb011830fcb884f22ff3, invert the alpha
            // mask.
            mask.Invert();

            // The end result is the bitmap filled with glow color and blurred 8-bit alpha mask
            Bitmap bmp(aAlpha.GetSizePixel(), vcl::PixelFormat::N24_BPP);