1 files changed, 80 insertions, 0 deletions
diff --git a/libs/hwui/pipeline/skia/ReorderBarrierDrawables.h b/libs/hwui/pipeline/skia/ReorderBarrierDrawables.h
new file mode 100644
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+++ b/libs/hwui/pipeline/skia/ReorderBarrierDrawables.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "RenderNodeDrawable.h"
+
+#include <SkCanvas.h>
+#include <SkDrawable.h>
+#include <utils/FatVector.h>
+
+namespace android {
+namespace uirenderer {
+namespace skiapipeline {
+
+class SkiaDisplayList;
+class EndReorderBarrierDrawable;
+
+/**
+ * StartReorderBarrierDrawable and EndReorderBarrierDrawable work together to define
+ * a sub-list in a display list that need to be drawn out-of-order sorted instead by render
+ * node Z index.
+ * StartReorderBarrierDrawable will sort the entire range and it will draw
+ * render nodes in the range with negative Z index.
+ */
+class StartReorderBarrierDrawable : public SkDrawable {
+public:
+    explicit StartReorderBarrierDrawable(SkiaDisplayList* data);
+
+protected:
+    virtual SkRect onGetBounds() override {
+        return SkRect::MakeLargest();
+    }
+    virtual void onDraw(SkCanvas* canvas) override;
+
+private:
+    size_t mEndChildIndex;
+    size_t mBeginChildIndex;
+    FatVector<RenderNodeDrawable*, 16> mChildren;
+    SkiaDisplayList* mDisplayList;
+
+    friend class EndReorderBarrierDrawable;
+};
+
+/**
+ * See StartReorderBarrierDrawable.
+ * EndReorderBarrierDrawable relies on StartReorderBarrierDrawable to host and sort the render
+ * nodes by Z index. When EndReorderBarrierDrawable is drawn it will draw all render nodes in the
+ * range with positive Z index. It is also responsible for drawing shadows for the nodes
+ * corresponding to their z-index.
+ */
+class EndReorderBarrierDrawable : public SkDrawable {
+public:
+    explicit EndReorderBarrierDrawable(StartReorderBarrierDrawable* startBarrier);
+protected:
+    virtual SkRect onGetBounds() override {
+        return SkRect::MakeLargest();
+    }
+    virtual void onDraw(SkCanvas* canvas) override;
+private:
+    void drawShadow(SkCanvas* canvas, RenderNodeDrawable* caster);
+    StartReorderBarrierDrawable* mStartBarrier;
+};
+
+}; // namespace skiapipeline
+}; // namespace uirenderer
+}; // namespace android