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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 */
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