Home | History | Annotate | Download | only in hwui 
      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     Outline()
     30             : mShouldClip(false)
     31             , mType(kOutlineType_None)
     32             , mRadius(0)
     33             , mAlpha(0.0f) {}
     34 
     35     void setRoundRect(int left, int top, int right, int bottom, float radius, float alpha) {
     36         mType = kOutlineType_RoundRect;
     37         mBounds.set(left, top, right, bottom);
     38         mRadius = radius;
     39         mPath.reset();
     40         mPath.addRoundRect(SkRect::MakeLTRB(left, top, right, bottom),
     41                 radius, radius);
     42         mAlpha = alpha;
     43     }
     44 
     45     void setConvexPath(const SkPath* outline, float alpha) {
     46         if (!outline) {
     47             setEmpty();
     48             return;
     49         }
     50         mType = kOutlineType_ConvexPath;
     51         mPath = *outline;
     52         mBounds.set(outline->getBounds());
     53         mAlpha = alpha;
     54     }
     55 
     56     void setEmpty() {
     57         mType = kOutlineType_Empty;
     58         mPath.reset();
     59         mAlpha = 0.0f;
     60     }
     61 
     62     void setNone() {
     63         mType = kOutlineType_None;
     64         mPath.reset();
     65         mAlpha = 0.0f;
     66     }
     67 
     68     bool isEmpty() const {
     69         return mType == kOutlineType_Empty;
     70     }
     71 
     72     float getAlpha() const {
     73         return mAlpha;
     74     }
     75 
     76     void setShouldClip(bool clip) {
     77         mShouldClip = clip;
     78     }
     79 
     80     bool getShouldClip() const {
     81         return mShouldClip;
     82     }
     83 
     84     bool willClip() const {
     85         // only round rect outlines can be used for clipping
     86         return mShouldClip && (mType == kOutlineType_RoundRect);
     87     }
     88 
     89     bool willRoundRectClip() const {
     90         // only round rect outlines can be used for clipping
     91         return willClip() && MathUtils::isPositive(mRadius);
     92     }
     93 
     94     bool getAsRoundRect(Rect* outRect, float* outRadius) const {
     95         if (mType == kOutlineType_RoundRect) {
     96             outRect->set(mBounds);
     97             *outRadius = mRadius;
     98             return true;
     99         }
    100         return false;
    101     }
    102 
    103     const SkPath* getPath() const {
    104         if (mType == kOutlineType_None || mType == kOutlineType_Empty) return nullptr;
    105 
    106         return &mPath;
    107     }
    108 
    109 private:
    110     enum OutlineType {
    111         kOutlineType_None = 0,
    112         kOutlineType_Empty = 1,
    113         kOutlineType_ConvexPath = 2,
    114         kOutlineType_RoundRect = 3
    115     };
    116 
    117     bool mShouldClip;
    118     OutlineType mType;
    119     Rect mBounds;
    120     float mRadius;
    121     float mAlpha;
    122     SkPath mPath;
    123 };
    124 
    125 } /* namespace uirenderer */
    126 } /* namespace android */
    127 
    128 #endif /* OUTLINE_H */
    129