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 (0x8000000)
31 
32 namespace android {
33 namespace uirenderer {
34 
35 struct DirtyStack;
36 class RenderNode;
37 class Matrix4;
38 
39 class DamageAccumulator {
40     PREVENT_COPY_AND_ASSIGN(DamageAccumulator);
41 
42 public:
43     DamageAccumulator();
44     // mAllocator will clean everything up for us, no need for a dtor
45 
46     // Push a transform node onto the stack. This should be called prior
47     // to any dirty() calls. Subsequent calls to dirty()
48     // will be affected by the transform when popTransform() is called.
49     void pushTransform(const RenderNode* transform);
50     void pushTransform(const Matrix4* transform);
51 
52     // Pops a transform node from the stack, propagating the dirty rect
53     // up to the parent node. Returns the IDamageTransform that was just applied
54     void popTransform();
55 
56     void dirty(float left, float top, float right, float bottom);
57 
58     // Returns the current dirty area, *NOT* transformed by pushed transforms
59     void peekAtDirty(SkRect* dest) const;
60 
61     ANDROID_API void computeCurrentTransform(Matrix4* outMatrix) const;
62 
63     void finish(SkRect* totalDirty);
64 
65 private:
66     void pushCommon();
67     void applyMatrix4Transform(DirtyStack* frame);
68     void applyRenderNodeTransform(DirtyStack* frame);
69 
70     LinearAllocator mAllocator;
71     DirtyStack* mHead;
72 };
73 
74 } /* namespace uirenderer */
75 } /* namespace android */
76 
77 #endif /* DAMAGEACCUMULATOR_H */
78