commit 8c84448febf817875ad0d377de0f0b34987992cb
author Mike Kaganski <mike.kaganski@collabora.com> Thu May 28 20:13:50 2020 +0200
committer Mike Kaganski <mike.kaganski@collabora.com> Fri May 29 06:26:16 2020 +0200
tree 03442162059cbe6fdfe82fa983e51881cab803a5
parent c9f4952b98da9adad1b556414c5fcecafedca473

Use buffer with alpha in VclProcessor2D::RenderUnifiedTransparencePrimitive2D

This allows UnifiedTransparencePrimitive2D to produce truly transparent image,
usable later in the stack - specifically by glow and soft edge effect.

Change-Id: I27e9bfbfb9c60856bc3fad1a483623c90d5cabff
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/94969
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

drawinglayer/source/processor2d/vclprocessor2d.cxx

diff --git a/drawinglayer/source/processor2d/vclprocessor2d.cxx b/drawinglayer/source/processor2d/vclprocessor2d.cxx
index 60b372b..e64995c 100644
--- a/drawinglayer/source/processor2d/vclprocessor2d.cxx
+++ b/drawinglayer/source/processor2d/vclprocessor2d.cxx
@@ -841,13 +841,14 @@ void VclProcessor2D::RenderUnifiedTransparencePrimitive2D(
        // transparence is in visible range
        basegfx::B2DRange aRange(rTransCandidate.getChildren().getB2DRange(getViewInformation2D()));
        aRange.transform(maCurrentTransformation);
        impBufferDevice aBufferDevice(*mpOutputDevice, aRange);
        impBufferDevice aBufferDevice(*mpOutputDevice, aRange, true);

        if (aBufferDevice.isVisible())
        {
            // remember last OutDev and set to content
            OutputDevice* pLastOutputDevice = mpOutputDevice;
            mpOutputDevice = &aBufferDevice.getContent();
            mpOutputDevice->Erase();

            // paint content to it
            process(rTransCandidate.getChildren());