commit f533e947035795a485344f4c270e16507f974901
author Chris Craik <ccraik@google.com> Tue Jan 14 22:35:37 2014 -0800
committer Chris Craik <ccraik@google.com> Wed Jan 15 16:14:01 2014 -0800
tree 8d2ddc12234898cc2f3578f6db01d4d25b2248ef
parent 81155da28476862a7056ec74312a8010ec154671

Support projection of DisplayLists onto ancestors.

For now, ancestor views signal the acceptance of projections with a
save(0x20)/restore pair.

During the order traversal, each view with the save(0x20) code will
collect descendent views with mProjectToContainedVolume (which still
needs to be renamed) so that they can be drawn out of order later.

- *Temporary* sample code added to HwAccelerationTest.

- Note that a projected displaylist must not be clipped.

Change-Id: I45c493e845961535b958d59c53e8aff3f8891d9f

libs/hwui/DisplayList.h

diff --git a/libs/hwui/DisplayList.h b/libs/hwui/DisplayList.h
index d3113a3..5399185 100644
--- a/libs/hwui/DisplayList.h
+++ b/libs/hwui/DisplayList.h
@@ -112,6 +112,7 @@
  */
 class DisplayListData : public LightRefBase<DisplayListData> {
 public:
+    DisplayListData() : projectionIndex(-1) {}
     // allocator into which all ops were allocated
     LinearAllocator allocator;
 
@@ -120,6 +121,10 @@
 
     // list of children display lists for quick, non-drawing traversal
     Vector<DrawDisplayListOp*> children;
+
+    // index of DisplayListOp restore, after which projected descendents should be drawn
+    int projectionIndex;
+    Matrix4 projectionTransform;
 };
 
 /**
@@ -522,8 +527,10 @@
     void applyViewPropertyTransforms(mat4& matrix);
 
     void computeOrderingImpl(DrawDisplayListOp* opState,
-            Vector<ZDrawDisplayListOpPair>* compositedChildrenOf3dRoot,
-            const mat4* transformFromRoot);
+        Vector<ZDrawDisplayListOpPair>* compositedChildrenOf3dRoot,
+        const mat4* transformFrom3dRoot,
+        Vector<DrawDisplayListOp*>* compositedChildrenOfProjectionSurface,
+        const mat4* transformFromProjectionSurface);
 
     template <class T>
     inline void setViewProperties(OpenGLRenderer& renderer, T& handler, const int level);
@@ -533,6 +540,9 @@
         T& handler, const int level);
 
     template <class T>
+    inline void iterateProjectedChildren(OpenGLRenderer& renderer, T& handler, const int level);
+
+    template <class T>
     inline void iterate(OpenGLRenderer& renderer, T& handler, const int level);
 
     void init();
@@ -610,6 +620,9 @@
 
     // for 3d roots, contains a z sorted list of all children items
     Vector<ZDrawDisplayListOpPair> m3dNodes;
+
+    // for projection surfaces, contains a list of all children items
+    Vector<DrawDisplayListOp*> mProjectedNodes;
 }; // class DisplayList
 
 }; // namespace uirenderer