Define shadow casting behavior within layers

bug:15860114

Savelayers and HW layers both now support shadow casting.

For save layers, the light source should always be correct, for HW
layers, the light source position is set when the layer is created,
and updated when it is resized.

Change-Id: Ie85567dd43c2bb0a0b08fd0bd4db41efa793ac2b

1 files changed, 2 insertions, 1 deletions

diff --git a/libs/hwui/StatefulBaseRenderer.cpp b/libs/hwui/StatefulBaseRenderer.cpp
index dc41157d5778..06c5ab42592a 100644
--- a/libs/hwui/StatefulBaseRenderer.cpp
+++ b/libs/hwui/StatefulBaseRenderer.cpp
@@ -35,11 +35,12 @@ StatefulBaseRenderer::StatefulBaseRenderer()
 }
 
 void StatefulBaseRenderer::initializeSaveStack(float clipLeft, float clipTop,
-        float clipRight, float clipBottom) {
+        float clipRight, float clipBottom, const Vector3& lightCenter) {
     mSnapshot = new Snapshot(mFirstSnapshot,
             SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag);
     mSnapshot->setClip(clipLeft, clipTop, clipRight, clipBottom);
     mSnapshot->fbo = getTargetFbo();
+    mSnapshot->setRelativeLightCenter(lightCenter);
     mSaveCount = 1;
 }