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 OUTLINE_H
17 #define OUTLINE_H
18 
19 #include <SkPath.h>
20 
21 #include "Rect.h"
22 #include "utils/MathUtils.h"
23 
24 namespace android {
25 namespace uirenderer {
26 
27 class Outline {
28 public:
29     enum class Type { None = 0, Empty = 1, ConvexPath = 2, RoundRect = 3 };
30 
Outline()31     Outline() : mShouldClip(false), mType(Type::None), mRadius(0), mAlpha(0.0f) {}
32 
setRoundRect(int left,int top,int right,int bottom,float radius,float alpha)33     void setRoundRect(int left, int top, int right, int bottom, float radius, float alpha) {
34         mAlpha = alpha;
35         if (mType == Type::RoundRect && left == mBounds.left && right == mBounds.right &&
36             top == mBounds.top && bottom == mBounds.bottom && radius == mRadius) {
37             // nothing to change, don't do any work
38             return;
39         }
40 
41         mType = Type::RoundRect;
42         mBounds.set(left, top, right, bottom);
43         mRadius = radius;
44 
45 
46         // Reuse memory if previous outline was the same shape (rect or round rect).
47         if ( mPath.countVerbs() > 10) {
48             mPath.reset();
49         } else {
50             mPath.rewind();
51         }
52 
53         // update mPath to reflect new outline
54         if (MathUtils::isPositive(radius)) {
55             mPath.addRoundRect(SkRect::MakeLTRB(left, top, right, bottom), radius, radius);
56         } else {
57             mPath.addRect(left, top, right, bottom);
58         }
59     }
60 
setConvexPath(const SkPath * outline,float alpha)61     void setConvexPath(const SkPath* outline, float alpha) {
62         if (!outline) {
63             setEmpty();
64             return;
65         }
66         mType = Type::ConvexPath;
67         mPath = *outline;
68         mBounds.set(outline->getBounds());
69         mAlpha = alpha;
70     }
71 
setEmpty()72     void setEmpty() {
73         mType = Type::Empty;
74         mPath.reset();
75         mAlpha = 0.0f;
76     }
77 
setNone()78     void setNone() {
79         mType = Type::None;
80         mPath.reset();
81         mAlpha = 0.0f;
82     }
83 
isEmpty()84     bool isEmpty() const { return mType == Type::Empty; }
85 
getAlpha()86     float getAlpha() const { return mAlpha; }
87 
setShouldClip(bool clip)88     void setShouldClip(bool clip) { mShouldClip = clip; }
89 
getShouldClip()90     bool getShouldClip() const { return mShouldClip; }
91 
willClip()92     bool willClip() const {
93         // only round rect outlines can be used for clipping
94         return mShouldClip && (mType == Type::RoundRect);
95     }
96 
willRoundRectClip()97     bool willRoundRectClip() const {
98         // only round rect outlines can be used for clipping
99         return willClip() && MathUtils::isPositive(mRadius);
100     }
101 
getAsRoundRect(Rect * outRect,float * outRadius)102     bool getAsRoundRect(Rect* outRect, float* outRadius) const {
103         if (mType == Type::RoundRect) {
104             outRect->set(mBounds);
105             *outRadius = mRadius;
106             return true;
107         }
108         return false;
109     }
110 
getPath()111     const SkPath* getPath() const {
112         if (mType == Type::None || mType == Type::Empty) return nullptr;
113 
114         return &mPath;
115     }
116 
getType()117     Type getType() const { return mType; }
118 
getBounds()119     const Rect& getBounds() const { return mBounds; }
120 
getRadius()121     float getRadius() const { return mRadius; }
122 
123 private:
124     bool mShouldClip;
125     Type mType;
126     Rect mBounds;
127     float mRadius;
128     float mAlpha;
129     SkPath mPath;
130 };
131 
132 } /* namespace uirenderer */
133 } /* namespace android */
134 
135 #endif /* OUTLINE_H */
136