1 files changed, 103 insertions, 0 deletions
diff --git a/libs/hwui/DamageAccumulator.h b/libs/hwui/DamageAccumulator.h
new file mode 100644
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+++ b/libs/hwui/DamageAccumulator.h
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+/*
+ * Copyright (C) 2014 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.
+ */
+#ifndef DAMAGEACCUMULATOR_H
+#define DAMAGEACCUMULATOR_H
+
+#include <cutils/compiler.h>
+#include <utils/LinearAllocator.h>
+
+#include <SkMatrix.h>
+#include <SkRect.h>
+
+#include "utils/Macros.h"
+
+namespace android {
+namespace uirenderer {
+
+struct DirtyStack;
+class RenderNode;
+class Matrix4;
+
+class IDamageAccumulator {
+public:
+    virtual void pushTransform(const RenderNode* transform) = 0;
+    virtual void pushTransform(const Matrix4* transform) = 0;
+    virtual void pushNullTransform() = 0;
+    virtual void popTransform() = 0;
+    virtual void dirty(float left, float top, float right, float bottom) = 0;
+    virtual void peekAtDirty(SkRect* dest) = 0;
+protected:
+    virtual ~IDamageAccumulator() {}
+};
+
+class DamageAccumulator : public IDamageAccumulator {
+    PREVENT_COPY_AND_ASSIGN(DamageAccumulator);
+public:
+    DamageAccumulator();
+    // mAllocator will clean everything up for us, no need for a dtor
+
+    // Push a transform node onto the stack. This should be called prior
+    // to any dirty() calls. Subsequent calls to dirty()
+    // will be affected by the transform when popTransform() is called.
+    virtual void pushTransform(const RenderNode* transform);
+    virtual void pushTransform(const Matrix4* transform);
+    // This is used in combination with peekAtDirty to inspect the damage
+    // area of a subtree
+    virtual void pushNullTransform();
+
+    // Pops a transform node from the stack, propagating the dirty rect
+    // up to the parent node. Returns the IDamageTransform that was just applied
+    virtual void popTransform();
+
+    virtual void dirty(float left, float top, float right, float bottom);
+
+    // Returns the current dirty area, *NOT* transformed by pushed transforms
+    virtual void peekAtDirty(SkRect* dest);
+
+    void finish(SkRect* totalDirty);
+
+private:
+    void pushCommon();
+    void applyMatrix4Transform(DirtyStack* frame);
+    void applyRenderNodeTransform(DirtyStack* frame);
+
+    LinearAllocator mAllocator;
+    DirtyStack* mHead;
+};
+
+class NullDamageAccumulator : public IDamageAccumulator {
+    PREVENT_COPY_AND_ASSIGN(NullDamageAccumulator);
+public:
+    virtual void pushTransform(const RenderNode* transform) { }
+    virtual void pushTransform(const Matrix4* transform) { }
+    virtual void pushNullTransform() { }
+    virtual void popTransform() { }
+    virtual void dirty(float left, float top, float right, float bottom) { }
+    virtual void peekAtDirty(SkRect* dest) { dest->setEmpty(); }
+
+    ANDROID_API static NullDamageAccumulator* instance();
+
+private:
+    NullDamageAccumulator() {}
+    ~NullDamageAccumulator() {}
+
+    static NullDamageAccumulator sInstance;
+};
+
+} /* namespace uirenderer */
+} /* namespace android */
+
+#endif /* DAMAGEACCUMULATOR_H */