commit 69e5adffb19135d51bde8e458f4907d7265f3e23
author Chris Craik <ccraik@google.com> Thu Aug 14 13:34:01 2014 -0700
committer Chris Craik <ccraik@google.com> Fri Aug 15 00:59:44 2014 +0000
tree 022fc23512ae5adfbe3f86351305bc9f4538a68a
parent e222e359a0aab985488a711f6edb76820fe8c6df

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

libs/hwui/Layer.h

diff --git a/libs/hwui/Layer.h b/libs/hwui/Layer.h
index 0bf05d0..38c29c7 100644
--- a/libs/hwui/Layer.h
+++ b/libs/hwui/Layer.h
@@ -86,6 +86,11 @@
         regionRect.translate(layer.left, layer.top);
     }
 
+    void setWindowTransform(Matrix4& windowTransform) {
+        cachedInvTransformInWindow.loadInverse(windowTransform);
+        rendererLightPosDirty = true;
+    }
+
     void updateDeferred(RenderNode* renderNode, int left, int top, int right, int bottom);
 
     inline uint32_t getWidth() const {
@@ -257,10 +262,10 @@
         return transform;
     }
 
-    void defer();
+    void defer(const OpenGLRenderer& rootRenderer);
     void cancelDefer();
     void flush();
-    void render();
+    void render(const OpenGLRenderer& rootRenderer);
 
     /**
      * Bounds of the layer.
@@ -304,6 +309,7 @@
 
 private:
     void requireRenderer();
+    void updateLightPosFromRenderer(const OpenGLRenderer& rootRenderer);
 
     Caches& caches;
 
@@ -383,6 +389,12 @@
     mat4 transform;
 
     /**
+     * Cached transform of layer in window, updated only on creation / resize
+     */
+    mat4 cachedInvTransformInWindow;
+    bool rendererLightPosDirty;
+
+    /**
      * Used to defer display lists when the layer is updated with a
      * display list.
      */