DamageAccumulator.h revision c128823940fb0be96eda810fa9f0c75f66d944b0 
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
27// Smaller than INT_MIN/INT_MAX because we offset these values
28// and thus don't want to be adding offsets to INT_MAX, that's bad
29#define DIRTY_MIN (-0x7ffffff-1)
30#define DIRTY_MAX (0x7ffffff)
31
32namespace android {
33namespace uirenderer {
34
35struct DirtyStack;
36class RenderNode;
37class Matrix4;
38
39class DamageAccumulator {
40    PREVENT_COPY_AND_ASSIGN(DamageAccumulator);
41public:
42    DamageAccumulator();
43    // mAllocator will clean everything up for us, no need for a dtor
44
45    // Push a transform node onto the stack. This should be called prior
46    // to any dirty() calls. Subsequent calls to dirty()
47    // will be affected by the transform when popTransform() is called.
48    void pushTransform(const RenderNode* transform);
49    void pushTransform(const Matrix4* transform);
50
51    // Pops a transform node from the stack, propagating the dirty rect
52    // up to the parent node. Returns the IDamageTransform that was just applied
53    void popTransform();
54
55    void dirty(float left, float top, float right, float bottom);
56
57    // Returns the current dirty area, *NOT* transformed by pushed transforms
58    void peekAtDirty(SkRect* dest) const;
59
60    void computeCurrentTransform(Matrix4* outMatrix) const;
61
62    void finish(SkRect* totalDirty);
63
64private:
65    void pushCommon();
66    void applyMatrix4Transform(DirtyStack* frame);
67    void applyRenderNodeTransform(DirtyStack* frame);
68
69    LinearAllocator mAllocator;
70    DirtyStack* mHead;
71};
72
73} /* namespace uirenderer */
74} /* namespace android */
75
76#endif /* DAMAGEACCUMULATOR_H */
77