commit e39bc9fd4310a3bc19ccbc24c9471977bbf536f1
author Jim Van Verth <jvanverth@google.com> Thu Jun 14 14:43:00 2018 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Thu Jun 14 19:09:44 2018 +0000
tree b9521a8f8b0426d616859eedf6cda5859f5c6ce2
parent 0510edeebf76b8a9753acc06afde8b09a8f00a54

Implement tilted concave ambient shadow

Bug: skia:7971
Change-Id: I6a92a5021f53ae10fb35ef355081653e96bc04b0
Reviewed-on: https://skia-review.googlesource.com/134844
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

src/utils/SkShadowTessellator.cpp

diff --git a/src/utils/SkShadowTessellator.cpp b/src/utils/SkShadowTessellator.cpp
index c50265f..79f8f22 100755
--- a/src/utils/SkShadowTessellator.cpp
+++ b/src/utils/SkShadowTessellator.cpp
@@ -794,9 +794,9 @@
     SkTDArray<int> penumbraIndices;
     penumbraPolygon.setReserve(umbraPolygon.count());
     penumbraIndices.setReserve(umbraPolygon.count());
-    // TODO: handle tilt
-    SkScalar radius = this->offset(fTransformedHeightFunc(fPathPolygon[0]));
-    if (!SkOffsetSimplePolygon(&fPathPolygon[0], fPathPolygon.count(), -radius,
+
+    auto offsetFunc = [this](const SkPoint& p) { return -this->offset(fTransformedHeightFunc(p)); };
+    if (!SkOffsetSimplePolygon(&fPathPolygon[0], fPathPolygon.count(), offsetFunc,
                                &penumbraPolygon, &penumbraIndices)) {
         // TODO: figure out how to handle this case
         return false;