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      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 
     23 namespace android {
     24 namespace uirenderer {
     25 
     26 class Outline {
     27 public:
     28     Outline()
     29             : mShouldClip(false)
     30             , mType(kOutlineType_None)
     31             , mRadius(0)
     32             , mAlpha(0.0f) {}
     33 
     34     void setRoundRect(int left, int top, int right, int bottom, float radius, float alpha) {
     35         mType = kOutlineType_RoundRect;
     36         mBounds.set(left, top, right, bottom);
     37         mRadius = radius;
     38         mPath.reset();
     39         mPath.addRoundRect(SkRect::MakeLTRB(left, top, right, bottom),
     40                 radius, radius);
     41         mAlpha = alpha;
     42     }
     43 
     44     void setConvexPath(const SkPath* outline, float alpha) {
     45         if (!outline) {
     46             setEmpty();
     47             return;
     48         }
     49         mType = kOutlineType_ConvexPath;
     50         mPath = *outline;
     51         mBounds.set(outline->getBounds());
     52         mAlpha = alpha;
     53     }
     54 
     55     void setEmpty() {
     56         mType = kOutlineType_Empty;
     57         mPath.reset();
     58         mAlpha = 0.0f;
     59     }
     60 
     61     void setNone() {
     62         mType = kOutlineType_None;
     63         mPath.reset();
     64         mAlpha = 0.0f;
     65     }
     66 
     67     bool isEmpty() const {
     68         return mType == kOutlineType_Empty;
     69     }
     70 
     71     float getAlpha() const {
     72         return mAlpha;
     73     }
     74 
     75     void setShouldClip(bool clip) {
     76         mShouldClip = clip;
     77     }
     78 
     79     bool getShouldClip() const {
     80         return mShouldClip;
     81     }
     82 
     83     bool willClip() const {
     84         // only round rect outlines can be used for clipping
     85         return mShouldClip && (mType == kOutlineType_RoundRect);
     86     }
     87 
     88     bool getAsRoundRect(Rect* outRect, float* outRadius) const {
     89         if (mType == kOutlineType_RoundRect) {
     90             outRect->set(mBounds);
     91             *outRadius = mRadius;
     92             return true;
     93         }
     94         return false;
     95     }
     96 
     97     const SkPath* getPath() const {
     98         if (mType == kOutlineType_None || mType == kOutlineType_Empty) return NULL;
     99 
    100         return &mPath;
    101     }
    102 
    103 private:
    104     enum OutlineType {
    105         kOutlineType_None = 0,
    106         kOutlineType_Empty = 1,
    107         kOutlineType_ConvexPath = 2,
    108         kOutlineType_RoundRect = 3
    109     };
    110 
    111     bool mShouldClip;
    112     OutlineType mType;
    113     Rect mBounds;
    114     float mRadius;
    115     float mAlpha;
    116     SkPath mPath;
    117 };
    118 
    119 } /* namespace uirenderer */
    120 } /* namespace android */
    121 
    122 #endif /* OUTLINE_H */
    123