Update HWUI matrix API

1. more closely mirror Skia API by using const ref instead of ptrs
2. store SkMatrix in the drawOp instead of the linear allocation heap

Change-Id: I4b9f6f76b9f7d19325e29303d27b793679fd4823
diff --git a/libs/hwui/DisplayList.cpp b/libs/hwui/DisplayList.cpp
index 96c6292..f418c9b 100644
--- a/libs/hwui/DisplayList.cpp
+++ b/libs/hwui/DisplayList.cpp
@@ -80,10 +80,6 @@
         delete paths.itemAt(i);
     }
 
-    for (size_t i = 0; i < matrices.size(); i++) {
-        delete matrices.itemAt(i);
-    }
-
     bitmapResources.clear();
     ownedBitmapResources.clear();
     patchResources.clear();
@@ -91,7 +87,6 @@
     paints.clear();
     regions.clear();
     paths.clear();
-    matrices.clear();
     layers.clear();
 }
 
diff --git a/libs/hwui/DisplayList.h b/libs/hwui/DisplayList.h
index 11e78b0..7b7dc16 100644
--- a/libs/hwui/DisplayList.h
+++ b/libs/hwui/DisplayList.h
@@ -125,7 +125,6 @@
     Vector<const SkPath*> paths;
     SortedVector<const SkPath*> sourcePaths;
     Vector<const SkRegion*> regions;
-    Vector<const SkMatrix*> matrices;
     Vector<Layer*> layers;
     uint32_t functorCount;
     bool hasDrawOps;
diff --git a/libs/hwui/DisplayListOp.h b/libs/hwui/DisplayListOp.h
index ea3e7a8..02f686f 100644
--- a/libs/hwui/DisplayListOp.h
+++ b/libs/hwui/DisplayListOp.h
@@ -472,7 +472,7 @@
 
 class SetMatrixOp : public StateOp {
 public:
-    SetMatrixOp(const SkMatrix* matrix)
+    SetMatrixOp(const SkMatrix& matrix)
             : mMatrix(matrix) {}
 
     virtual void applyState(OpenGLRenderer& renderer, int saveCount) const {
@@ -480,22 +480,22 @@
     }
 
     virtual void output(int level, uint32_t logFlags) const {
-        if (mMatrix) {
-            OP_LOG("SetMatrix " SK_MATRIX_STRING, SK_MATRIX_ARGS(mMatrix));
-        } else {
+        if (mMatrix.isIdentity()) {
             OP_LOGS("SetMatrix (reset)");
+        } else {
+            OP_LOG("SetMatrix " SK_MATRIX_STRING, SK_MATRIX_ARGS(&mMatrix));
         }
     }
 
     virtual const char* name() { return "SetMatrix"; }
 
 private:
-    const SkMatrix* mMatrix;
+    const SkMatrix mMatrix;
 };
 
 class ConcatMatrixOp : public StateOp {
 public:
-    ConcatMatrixOp(const SkMatrix* matrix)
+    ConcatMatrixOp(const SkMatrix& matrix)
             : mMatrix(matrix) {}
 
     virtual void applyState(OpenGLRenderer& renderer, int saveCount) const {
@@ -503,13 +503,13 @@
     }
 
     virtual void output(int level, uint32_t logFlags) const {
-        OP_LOG("ConcatMatrix " SK_MATRIX_STRING, SK_MATRIX_ARGS(mMatrix));
+        OP_LOG("ConcatMatrix " SK_MATRIX_STRING, SK_MATRIX_ARGS(&mMatrix));
     }
 
     virtual const char* name() { return "ConcatMatrix"; }
 
 private:
-    const SkMatrix* mMatrix;
+    const SkMatrix mMatrix;
 };
 
 class ClipOp : public StateOp {
@@ -746,10 +746,10 @@
 
 class DrawBitmapMatrixOp : public DrawBoundedOp {
 public:
-    DrawBitmapMatrixOp(const SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint)
+    DrawBitmapMatrixOp(const SkBitmap* bitmap, const SkMatrix& matrix, const SkPaint* paint)
             : DrawBoundedOp(paint), mBitmap(bitmap), mMatrix(matrix) {
         mLocalBounds.set(0, 0, bitmap->width(), bitmap->height());
-        const mat4 transform(*matrix);
+        const mat4 transform(matrix);
         transform.mapRect(mLocalBounds);
     }
 
@@ -758,7 +758,7 @@
     }
 
     virtual void output(int level, uint32_t logFlags) const {
-        OP_LOG("Draw bitmap %p matrix " SK_MATRIX_STRING, mBitmap, SK_MATRIX_ARGS(mMatrix));
+        OP_LOG("Draw bitmap %p matrix " SK_MATRIX_STRING, mBitmap, SK_MATRIX_ARGS(&mMatrix));
     }
 
     virtual const char* name() { return "DrawBitmapMatrix"; }
@@ -770,7 +770,7 @@
 
 private:
     const SkBitmap* mBitmap;
-    const SkMatrix* mMatrix;
+    const SkMatrix mMatrix;
 };
 
 class DrawBitmapRectOp : public DrawBoundedOp {
diff --git a/libs/hwui/DisplayListRenderer.cpp b/libs/hwui/DisplayListRenderer.cpp
index 229afdf..0e47c6e2 100644
--- a/libs/hwui/DisplayListRenderer.cpp
+++ b/libs/hwui/DisplayListRenderer.cpp
@@ -141,14 +141,12 @@
     StatefulBaseRenderer::skew(sx, sy);
 }
 
-void DisplayListRenderer::setMatrix(const SkMatrix* matrix) {
-    matrix = refMatrix(matrix);
+void DisplayListRenderer::setMatrix(const SkMatrix& matrix) {
     addStateOp(new (alloc()) SetMatrixOp(matrix));
     StatefulBaseRenderer::setMatrix(matrix);
 }
 
-void DisplayListRenderer::concatMatrix(const SkMatrix* matrix) {
-    matrix = refMatrix(matrix);
+void DisplayListRenderer::concatMatrix(const SkMatrix& matrix) {
     addStateOp(new (alloc()) ConcatMatrixOp(matrix));
     StatefulBaseRenderer::concatMatrix(matrix);
 }
@@ -203,10 +201,9 @@
     return DrawGlInfo::kStatusDone;
 }
 
-status_t DisplayListRenderer::drawBitmap(const SkBitmap* bitmap, const SkMatrix* matrix,
+status_t DisplayListRenderer::drawBitmap(const SkBitmap* bitmap, const SkMatrix& matrix,
         const SkPaint* paint) {
     bitmap = refBitmap(bitmap);
-    matrix = refMatrix(matrix);
     paint = refPaint(paint);
 
     addDrawOp(new (alloc()) DrawBitmapMatrixOp(bitmap, matrix, paint));
diff --git a/libs/hwui/DisplayListRenderer.h b/libs/hwui/DisplayListRenderer.h
index f0ae00f..195b00b 100644
--- a/libs/hwui/DisplayListRenderer.h
+++ b/libs/hwui/DisplayListRenderer.h
@@ -86,8 +86,8 @@
     virtual void scale(float sx, float sy);
     virtual void skew(float sx, float sy);
 
-    virtual void setMatrix(const SkMatrix* matrix);
-    virtual void concatMatrix(const SkMatrix* matrix);
+    virtual void setMatrix(const SkMatrix& matrix);
+    virtual void concatMatrix(const SkMatrix& matrix);
 
     // Clip
     virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op);
@@ -106,7 +106,7 @@
     // Bitmap-based
     virtual status_t drawBitmap(const SkBitmap* bitmap, float left, float top,
             const SkPaint* paint);
-    virtual status_t drawBitmap(const SkBitmap* bitmap, const SkMatrix* matrix,
+    virtual status_t drawBitmap(const SkBitmap* bitmap, const SkMatrix& matrix,
             const SkPaint* paint);
     virtual status_t drawBitmap(const SkBitmap* bitmap, float srcLeft, float srcTop,
             float srcRight, float srcBottom, float dstLeft, float dstTop,
@@ -233,17 +233,6 @@
         return regionCopy;
     }
 
-    inline const SkMatrix* refMatrix(const SkMatrix* matrix) {
-        if (matrix) {
-            // Copying the matrix is cheap and prevents against the user changing
-            // the original matrix before the operation that uses it
-            const SkMatrix* copy = new SkMatrix(*matrix);
-            mDisplayListData->matrices.add(copy);
-            return copy;
-        }
-        return matrix;
-    }
-
     inline Layer* refLayer(Layer* layer) {
         mDisplayListData->layers.add(layer);
         mCaches.resourceCache.incrementRefcount(layer);
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index 71836dd5..cd09f86 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -2042,10 +2042,10 @@
     return DrawGlInfo::kStatusDrew;
 }
 
-status_t OpenGLRenderer::drawBitmap(const SkBitmap* bitmap, const SkMatrix* matrix,
+status_t OpenGLRenderer::drawBitmap(const SkBitmap* bitmap, const SkMatrix& matrix,
         const SkPaint* paint) {
     Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height());
-    const mat4 transform(*matrix);
+    const mat4 transform(matrix);
     transform.mapRect(r);
 
     if (quickRejectSetupScissor(r.left, r.top, r.right, r.bottom)) {
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index fc27947..0f953a5 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -170,7 +170,7 @@
             const SkPaint* paint);
     status_t drawBitmaps(const SkBitmap* bitmap, AssetAtlas::Entry* entry, int bitmapCount,
             TextureVertex* vertices, bool pureTranslate, const Rect& bounds, const SkPaint* paint);
-    virtual status_t drawBitmap(const SkBitmap* bitmap, const SkMatrix* matrix,
+    virtual status_t drawBitmap(const SkBitmap* bitmap, const SkMatrix& matrix,
             const SkPaint* paint);
     virtual status_t drawBitmap(const SkBitmap* bitmap, float srcLeft, float srcTop,
             float srcRight, float srcBottom, float dstLeft, float dstTop,
diff --git a/libs/hwui/RenderNode.cpp b/libs/hwui/RenderNode.cpp
index df74f31..b65fe9e 100644
--- a/libs/hwui/RenderNode.cpp
+++ b/libs/hwui/RenderNode.cpp
@@ -212,9 +212,9 @@
         renderer.translate(properties().getLeft(), properties().getTop());
     }
     if (properties().getStaticMatrix()) {
-        renderer.concatMatrix(properties().getStaticMatrix());
+        renderer.concatMatrix(*properties().getStaticMatrix());
     } else if (properties().getAnimationMatrix()) {
-        renderer.concatMatrix(properties().getAnimationMatrix());
+        renderer.concatMatrix(*properties().getAnimationMatrix());
     }
     if (properties().hasTransformMatrix()) {
         if (properties().isTransformTranslateOnly()) {
diff --git a/libs/hwui/Renderer.h b/libs/hwui/Renderer.h
index 23cab0e..320895c 100644
--- a/libs/hwui/Renderer.h
+++ b/libs/hwui/Renderer.h
@@ -170,8 +170,8 @@
     virtual void scale(float sx, float sy) = 0;
     virtual void skew(float sx, float sy) = 0;
 
-    virtual void setMatrix(const SkMatrix* matrix) = 0;
-    virtual void concatMatrix(const SkMatrix* matrix) = 0;
+    virtual void setMatrix(const SkMatrix& matrix) = 0;
+    virtual void concatMatrix(const SkMatrix& matrix) = 0;
 
     // clip
     virtual const Rect& getLocalClipBounds() const = 0;
@@ -193,7 +193,7 @@
     // Bitmap-based
     virtual status_t drawBitmap(const SkBitmap* bitmap, float left, float top,
             const SkPaint* paint) = 0;
-    virtual status_t drawBitmap(const SkBitmap* bitmap, const SkMatrix* matrix,
+    virtual status_t drawBitmap(const SkBitmap* bitmap, const SkMatrix& matrix,
             const SkPaint* paint) = 0;
     virtual status_t drawBitmap(const SkBitmap* bitmap, float srcLeft, float srcTop,
             float srcRight, float srcBottom, float dstLeft, float dstTop,
diff --git a/libs/hwui/StatefulBaseRenderer.cpp b/libs/hwui/StatefulBaseRenderer.cpp
index 90039e9..fae25a6 100644
--- a/libs/hwui/StatefulBaseRenderer.cpp
+++ b/libs/hwui/StatefulBaseRenderer.cpp
@@ -121,20 +121,16 @@
     mSnapshot->transform->skew(sx, sy);
 }
 
-void StatefulBaseRenderer::setMatrix(const SkMatrix* matrix) {
-    if (matrix) {
-        mSnapshot->transform->load(*matrix);
-    } else {
-        mSnapshot->transform->loadIdentity();
-    }
+void StatefulBaseRenderer::setMatrix(const SkMatrix& matrix) {
+    mSnapshot->transform->load(matrix);
 }
 
 void StatefulBaseRenderer::setMatrix(const Matrix4& matrix) {
     mSnapshot->transform->load(matrix);
 }
 
-void StatefulBaseRenderer::concatMatrix(const SkMatrix* matrix) {
-    mat4 transform(*matrix);
+void StatefulBaseRenderer::concatMatrix(const SkMatrix& matrix) {
+    mat4 transform(matrix);
     mSnapshot->transform->multiply(transform);
 }
 
diff --git a/libs/hwui/StatefulBaseRenderer.h b/libs/hwui/StatefulBaseRenderer.h
index 057006b..f38c752 100644
--- a/libs/hwui/StatefulBaseRenderer.h
+++ b/libs/hwui/StatefulBaseRenderer.h
@@ -75,9 +75,9 @@
     virtual void scale(float sx, float sy);
     virtual void skew(float sx, float sy);
 
-    virtual void setMatrix(const SkMatrix* matrix);
+    virtual void setMatrix(const SkMatrix& matrix);
     void setMatrix(const Matrix4& matrix); // internal only convenience method
-    virtual void concatMatrix(const SkMatrix* matrix);
+    virtual void concatMatrix(const SkMatrix& matrix);
     void concatMatrix(const Matrix4& matrix); // internal only convenience method
 
     // Clip