125300 enhanced handling of multiple ClipRegions in MetafileProcessor
Notes:
merged as: 2ddfaf1f03135c10d33e0e99ebe8a56d3783d214
diff --git a/drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx b/drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx
index d53f7a3..5186719 100644
--- a/drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx
+++ b/drawinglayer/source/processor2d/vclmetafileprocessor2d.cxx
@@ -1744,17 +1744,52 @@ namespace drawinglayer
if(maClipPolyPolygon.count())
{
// there is already a clip polygon set; build clipped union of
// current mask polygon and new one
maClipPolyPolygon = basegfx::tools::clipPolyPolygonOnPolyPolygon(
aMask,
maClipPolyPolygon,
true, // #i106516# we want the inside of aMask, not the outside
false);
// due to the cost of PolyPolygon clipping and numerical reasons try first if the current
// and the new ClipRegion are ranges. If yes, processing can be simplified
if(basegfx::tools::isRectangle(aMask)
&& basegfx::tools::isRectangle(maClipPolyPolygon))
{
// both ClipPolygons are rectangles
if(aMask.getB2DRange().equal(maClipPolyPolygon.getB2DRange()))
{
// equal -> no change in ClipRegion needed, leave
// maClipPolyPolygon unchanged
}
else
{
// not equal -> create new ClipRegion from the two ranges
basegfx::B2DRange aClipRange(aMask.getB2DRange());
aClipRange.intersect(maClipPolyPolygon.getB2DRange());
if(aClipRange.isEmpty())
{
// no common ClipRegion -> set empty ClipRegion, no content to show
maClipPolyPolygon.clear();
}
else
{
// use common ClipRegion as new ClipRegion
maClipPolyPolygon = basegfx::B2DPolyPolygon(
basegfx::tools::createPolygonFromRect(aClipRange));
}
}
}
else
{
// The current ClipRegion or the new one is not a rectangle;
// there is already a clip polygon set; build clipped union of
// current mask polygon and new one
maClipPolyPolygon = basegfx::tools::clipPolyPolygonOnPolyPolygon(
aMask,
maClipPolyPolygon,
true, // #i106516# we want the inside of aMask, not the outside
false);
}
}
else
{
// use mask directly
// use new mask directly as ClipRegion
maClipPolyPolygon = aMask;
}
@@ -1763,8 +1798,13 @@ namespace drawinglayer
// set VCL clip region; subdivide before conversion to tools polygon. Subdivision necessary (!)
// Removed subdivision and fixed in Region::ImplPolyPolyRegionToBandRegionFunc() in VCL where
// the ClipRegion is built from the Polygon. A AdaptiveSubdivide on the source polygon was missing there
mpOutputDevice->Push(PUSH_CLIPREGION);
mpOutputDevice->SetClipRegion(Region(maClipPolyPolygon));
const bool bNewClipRegion(maClipPolyPolygon != aLastClipPolyPolygon);
if(bNewClipRegion)
{
mpOutputDevice->Push(PUSH_CLIPREGION);
mpOutputDevice->SetClipRegion(Region(maClipPolyPolygon));
}
// recursively paint content
// #121267# Only need to process sub-content when clip polygon is *not* empty.
@@ -1772,7 +1812,10 @@ namespace drawinglayer
process(rMaskCandidate.getChildren());
// restore VCL clip region
mpOutputDevice->Pop();
if(bNewClipRegion)
{
mpOutputDevice->Pop();
}
}
// restore to rescued clip polygon
