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      1 /*
      2  * Copyright (C) 2015 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 CLIPAREA_H
     17 #define CLIPAREA_H
     18 
     19 #include <SkRegion.h>
     20 
     21 #include "Matrix.h"
     22 #include "Rect.h"
     23 #include "utils/Pair.h"
     24 
     25 namespace android {
     26 namespace uirenderer {
     27 
     28 Rect transformAndCalculateBounds(const Rect& r, const Matrix4& transform);
     29 
     30 class TransformedRectangle {
     31 public:
     32     TransformedRectangle();
     33     TransformedRectangle(const Rect& bounds, const Matrix4& transform);
     34 
     35     bool canSimplyIntersectWith(const TransformedRectangle& other) const;
     36     bool intersectWith(const TransformedRectangle& other);
     37 
     38     bool isEmpty() const;
     39 
     40     const Rect& getBounds() const {
     41         return mBounds;
     42     }
     43 
     44     Rect transformedBounds() const {
     45         Rect transformedBounds(transformAndCalculateBounds(mBounds, mTransform));
     46         return transformedBounds;
     47     }
     48 
     49     const Matrix4& getTransform() const {
     50         return mTransform;
     51     }
     52 
     53 private:
     54     Rect mBounds;
     55     Matrix4 mTransform;
     56 };
     57 
     58 class RectangleList {
     59 public:
     60     RectangleList();
     61 
     62     bool isEmpty() const;
     63     int getTransformedRectanglesCount() const;
     64     const TransformedRectangle& getTransformedRectangle(int i) const;
     65 
     66     void setEmpty();
     67     void set(const Rect& bounds, const Matrix4& transform);
     68     bool intersectWith(const Rect& bounds, const Matrix4& transform);
     69 
     70     SkRegion convertToRegion(const SkRegion& clip) const;
     71     Rect calculateBounds() const;
     72 
     73 private:
     74     enum {
     75         kMaxTransformedRectangles = 5
     76     };
     77 
     78     int mTransformedRectanglesCount;
     79     TransformedRectangle mTransformedRectangles[kMaxTransformedRectangles];
     80 };
     81 
     82 class ClipArea {
     83 public:
     84     ClipArea();
     85 
     86     void setViewportDimensions(int width, int height);
     87 
     88     bool isEmpty() const {
     89         return mClipRect.isEmpty();
     90     }
     91 
     92     void setEmpty();
     93     void setClip(float left, float top, float right, float bottom);
     94     bool clipRectWithTransform(float left, float top, float right, float bottom,
     95             const mat4* transform, SkRegion::Op op = SkRegion::kIntersect_Op);
     96     bool clipRectWithTransform(const Rect& r, const mat4* transform,
     97             SkRegion::Op op = SkRegion::kIntersect_Op);
     98     bool clipRegion(const SkRegion& region, SkRegion::Op op = SkRegion::kIntersect_Op);
     99     bool clipPathWithTransform(const SkPath& path, const mat4* transform,
    100             SkRegion::Op op);
    101 
    102     const Rect& getClipRect() const {
    103         return mClipRect;
    104     }
    105 
    106     const SkRegion& getClipRegion() const {
    107         return mClipRegion;
    108     }
    109 
    110     const RectangleList& getRectangleList() const {
    111         return mRectangleList;
    112     }
    113 
    114     bool isRegion() const {
    115         return kModeRegion == mMode;
    116     }
    117 
    118     bool isSimple() const {
    119         return mMode == kModeRectangle;
    120     }
    121 
    122     bool isRectangleList() const {
    123         return mMode == kModeRectangleList;
    124     }
    125 
    126 private:
    127     void enterRectangleMode();
    128     bool rectangleModeClipRectWithTransform(const Rect& r, const mat4* transform, SkRegion::Op op);
    129     bool rectangleModeClipRectWithTransform(float left, float top, float right,
    130             float bottom, const mat4* transform, SkRegion::Op op);
    131 
    132     void enterRectangleListMode();
    133     bool rectangleListModeClipRectWithTransform(float left, float top,
    134             float right, float bottom, const mat4* transform, SkRegion::Op op);
    135     bool rectangleListModeClipRectWithTransform(const Rect& r,
    136             const mat4* transform, SkRegion::Op op);
    137 
    138     void enterRegionModeFromRectangleMode();
    139     void enterRegionModeFromRectangleListMode();
    140     void enterRegionMode();
    141     bool regionModeClipRectWithTransform(const Rect& r, const mat4* transform,
    142             SkRegion::Op op);
    143     bool regionModeClipRectWithTransform(float left, float top, float right,
    144             float bottom, const mat4* transform, SkRegion::Op op);
    145 
    146     void ensureClipRegion();
    147     void onClipRegionUpdated();
    148     bool clipRegionOp(float left, float top, float right, float bottom,
    149             SkRegion::Op op);
    150 
    151     SkRegion createViewportRegion() {
    152         return SkRegion(mViewportBounds.toSkIRect());
    153     }
    154 
    155     void regionFromPath(const SkPath& path, SkRegion& pathAsRegion) {
    156         // TODO: this should not mask every path to the viewport - this makes it impossible to use
    157         // paths to clip to larger areas (which is valid e.g. with SkRegion::kReplace_Op)
    158         pathAsRegion.setPath(path, createViewportRegion());
    159     }
    160 
    161     enum Mode {
    162         kModeRectangle,
    163         kModeRegion,
    164         kModeRectangleList
    165     };
    166 
    167     Mode mMode;
    168     Rect mViewportBounds;
    169     Rect mClipRect;
    170     SkRegion mClipRegion;
    171     RectangleList mRectangleList;
    172 };
    173 
    174 } /* namespace uirenderer */
    175 } /* namespace android */
    176 
    177 #endif /* CLIPAREA_H_ */
    178