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 namespace android {
28 namespace uirenderer {
29 
30 struct DirtyStack;
31 class RenderNode;
32 class Matrix4;
33 
34 class DamageAccumulator {
35     PREVENT_COPY_AND_ASSIGN(DamageAccumulator);
36 public:
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 
59 private:
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