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 {
30         None = 0,
31         Empty = 1,
32         ConvexPath = 2,
33         RoundRect = 3
34     };
35 
Outline()36     Outline()
37             : mShouldClip(false)
38             , mType(Type::None)
39             , mRadius(0)
40             , mAlpha(0.0f) {}
41 
setRoundRect(int left,int top,int right,int bottom,float radius,float alpha)42     void setRoundRect(int left, int top, int right, int bottom, float radius, float alpha) {
43         mAlpha = alpha;
44         if (mType == Type::RoundRect
45                 && left == mBounds.left
46                 && right == mBounds.right
47                 && top == mBounds.top
48                 && bottom == mBounds.bottom
49                 && radius == mRadius) {
50             // nothing to change, don't do any work
51             return;
52         }
53 
54         mType = Type::RoundRect;
55         mBounds.set(left, top, right, bottom);
56         mRadius = radius;
57 
58         // update mPath to reflect new outline
59         mPath.reset();
60         if (MathUtils::isPositive(radius)) {
61             mPath.addRoundRect(SkRect::MakeLTRB(left, top, right, bottom),
62                     radius, radius);
63         } else {
64             mPath.addRect(left, top, right, bottom);
65         }
66     }
67 
setConvexPath(const SkPath * outline,float alpha)68     void setConvexPath(const SkPath* outline, float alpha) {
69         if (!outline) {
70             setEmpty();
71             return;
72         }
73         mType = Type::ConvexPath;
74         mPath = *outline;
75         mBounds.set(outline->getBounds());
76         mAlpha = alpha;
77     }
78 
setEmpty()79     void setEmpty() {
80         mType = Type::Empty;
81         mPath.reset();
82         mAlpha = 0.0f;
83     }
84 
setNone()85     void setNone() {
86         mType = Type::None;
87         mPath.reset();
88         mAlpha = 0.0f;
89     }
90 
isEmpty()91     bool isEmpty() const {
92         return mType == Type::Empty;
93     }
94 
getAlpha()95     float getAlpha() const {
96         return mAlpha;
97     }
98 
setShouldClip(bool clip)99     void setShouldClip(bool clip) {
100         mShouldClip = clip;
101     }
102 
getShouldClip()103     bool getShouldClip() const {
104         return mShouldClip;
105     }
106 
willClip()107     bool willClip() const {
108         // only round rect outlines can be used for clipping
109         return mShouldClip && (mType == Type::RoundRect);
110     }
111 
willRoundRectClip()112     bool willRoundRectClip() const {
113         // only round rect outlines can be used for clipping
114         return willClip() && MathUtils::isPositive(mRadius);
115     }
116 
getAsRoundRect(Rect * outRect,float * outRadius)117     bool getAsRoundRect(Rect* outRect, float* outRadius) const {
118         if (mType == Type::RoundRect) {
119             outRect->set(mBounds);
120             *outRadius = mRadius;
121             return true;
122         }
123         return false;
124     }
125 
getPath()126     const SkPath* getPath() const {
127         if (mType == Type::None || mType == Type::Empty) return nullptr;
128 
129         return &mPath;
130     }
131 
getType()132     Type getType() const {
133         return mType;
134     }
135 
getBounds()136     const Rect& getBounds() const {
137         return mBounds;
138     }
139 
getRadius()140     float getRadius() const {
141         return mRadius;
142     }
143 
144 private:
145     bool mShouldClip;
146     Type mType;
147     Rect mBounds;
148     float mRadius;
149     float mAlpha;
150     SkPath mPath;
151 };
152 
153 } /* namespace uirenderer */
154 } /* namespace android */
155 
156 #endif /* OUTLINE_H */
157