Related: tdf#144091 svx: fix interaction of transp cell fill and transp shadow

This is a follow-up to commit 37a52d30bbfcf1d073779b50139c4dafa507be4b
(tdf#144091 svx: fix unwanted blur of shadow from table cell fill,
2021-09-20), where it turned out that the original bugdoc was just a
special case of almost full transparency (80%), that's why avoiding the
blur fixed the problem.

A more general approach instead is to multiply the alpha or the cell
fill of table shapes and the alpha of the shadow itself. The end result
is the same (80% transparency) for the first bugdoc, but this gives back
the blur on the second bugdoc.

(cherry picked from commit 00fa364a2403dc23a786d3f91fde06e10b3a4a9a)

Conflicts:
	drawinglayer/source/primitive2d/shadowprimitive2d.cxx
	drawinglayer/source/processor2d/vclpixelprocessor2d.cxx
	include/drawinglayer/primitive2d/BufferedDecompositionPrimitive2D.hxx
	svx/source/sdr/primitive2d/sdrdecompositiontools.cxx
	svx/source/table/viewcontactoftableobj.cxx

Change-Id: I63560e3a73473c70157ecee8365ec7154217f269
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122680
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/svx/qa/unit/table.cxx b/svx/qa/unit/table.cxx
index 4419892a42ba..f65118e536c6 100644
--- a/svx/qa/unit/table.cxx
+++ b/svx/qa/unit/table.cxx
@@ -89,11 +89,13 @@ CPPUNIT_TEST_FIXTURE(Test, testTableShadowBlur)
     drawinglayer::Primitive2dXmlDump aDumper;
     xmlDocUniquePtr pDocument = aDumper.dumpAndParse(xPrimitiveSequence);
     // Without the accompanying fix in place, this test would have failed with:
-    // - Expected: true
-    // - Actual  : false
-    // i.e. blur was applied on both the cell fill and the cell border.
-    assertXPath(pDocument, "//shadow/transform/modifiedColor/sdrCell[1]", "excludeFromBlur",
-                "true");
+    // - number of nodes is incorrect
+    // - Expected: 1
+    // - Actual  : 0
+    // i.e. the shadow itself was not transparent and that resulted in a non-transparent rendering
+    // as well, while the rendering transparency should be based on the transparency of the shadow
+    // itself and the transparency of the cell fill.
+    assertXPath(pDocument, "//objectinfo/unifiedtransparence[1]", "transparence", "0.8");
 }
 }