1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16#ifndef DAMAGEACCUMULATOR_H
17#define DAMAGEACCUMULATOR_H
18
19#include <cutils/compiler.h>
20#include <utils/LinearAllocator.h>
21
22#include <SkMatrix.h>
23#include <SkRect.h>
24
25#include "utils/Macros.h"
26
27namespace android {
28namespace uirenderer {
29
30struct DirtyStack;
31class RenderNode;
32class Matrix4;
33
34class DamageAccumulator {
35    PREVENT_COPY_AND_ASSIGN(DamageAccumulator);
36public:
37    DamageAccumulator();
38    // mAllocator will clean everything up for us, no need for a dtor
39
40    // Push a transform node onto the stack. This should be called prior
41    // to any dirty() calls. Subsequent calls to dirty()
42    // will be affected by the transform when popTransform() is called.
43    void pushTransform(const RenderNode* transform);
44    void pushTransform(const Matrix4* transform);
45
46    // Pops a transform node from the stack, propagating the dirty rect
47    // up to the parent node. Returns the IDamageTransform that was just applied
48    void popTransform();
49
50    void dirty(float left, float top, float right, float bottom);
51
52    // Returns the current dirty area, *NOT* transformed by pushed transforms
53    void peekAtDirty(SkRect* dest) const;
54
55    void computeCurrentTransform(Matrix4* outMatrix) const;
56
57    void finish(SkRect* totalDirty);
58
59private:
60    void pushCommon();
61    void applyMatrix4Transform(DirtyStack* frame);
62    void applyRenderNodeTransform(DirtyStack* frame);
63
64    LinearAllocator mAllocator;
65    DirtyStack* mHead;
66};
67
68} /* namespace uirenderer */
69} /* namespace android */
70
71#endif /* DAMAGEACCUMULATOR_H */
72