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
diff --git a/libs/hwui/Snapshot.cpp b/libs/hwui/Snapshot.cpp
index 6f19275..ecc47d2 100644
--- a/libs/hwui/Snapshot.cpp
+++ b/libs/hwui/Snapshot.cpp
@@ -55,7 +55,8 @@
, empty(false)
, alpha(s->alpha)
, roundRectClipState(s->roundRectClipState)
- , mViewportData(s->mViewportData) {
+ , mViewportData(s->mViewportData)
+ , mRelativeLightCenter(s->mRelativeLightCenter) {
if (saveFlags & SkCanvas::kMatrix_SaveFlag) {
mTransformRoot.load(*s->transform);
transform = &mTransformRoot;
@@ -200,6 +201,13 @@
///////////////////////////////////////////////////////////////////////////////
void Snapshot::resetTransform(float x, float y, float z) {
+ // before resetting, map current light pos with inverse of current transform
+ Vector3 center = mRelativeLightCenter;
+ mat4 inverse;
+ inverse.loadInverse(*transform);
+ inverse.mapPoint3d(center);
+ mRelativeLightCenter = center;
+
transform = &mTransformRoot;
transform->loadTranslate(x, y, z);
}