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      1 /*
      2  * Copyright (C) 2016 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 
     17 #pragma once
     18 
     19 #include "RenderNodeDrawable.h"
     20 
     21 #include <SkCanvas.h>
     22 #include <SkDrawable.h>
     23 #include <utils/FatVector.h>
     24 
     25 namespace android {
     26 namespace uirenderer {
     27 namespace skiapipeline {
     28 
     29 class SkiaDisplayList;
     30 class EndReorderBarrierDrawable;
     31 
     32 /**
     33  * StartReorderBarrierDrawable and EndReorderBarrierDrawable work together to define
     34  * a sub-list in a display list that need to be drawn out-of-order sorted instead by render
     35  * node Z index.
     36  * StartReorderBarrierDrawable will sort the entire range and it will draw
     37  * render nodes in the range with negative Z index.
     38  */
     39 class StartReorderBarrierDrawable : public SkDrawable {
     40 public:
     41     explicit StartReorderBarrierDrawable(SkiaDisplayList* data);
     42 
     43 protected:
     44     virtual SkRect onGetBounds() override {
     45         return SkRect::MakeLargest();
     46     }
     47     virtual void onDraw(SkCanvas* canvas) override;
     48 
     49 private:
     50     int mEndChildIndex;
     51     int mBeginChildIndex;
     52     FatVector<RenderNodeDrawable*, 16> mChildren;
     53     SkiaDisplayList* mDisplayList;
     54 
     55     friend class EndReorderBarrierDrawable;
     56 };
     57 
     58 /**
     59  * See StartReorderBarrierDrawable.
     60  * EndReorderBarrierDrawable relies on StartReorderBarrierDrawable to host and sort the render
     61  * nodes by Z index. When EndReorderBarrierDrawable is drawn it will draw all render nodes in the
     62  * range with positive Z index. It is also responsible for drawing shadows for the nodes
     63  * corresponding to their z-index.
     64  */
     65 class EndReorderBarrierDrawable : public SkDrawable {
     66 public:
     67     explicit EndReorderBarrierDrawable(StartReorderBarrierDrawable* startBarrier);
     68 protected:
     69     virtual SkRect onGetBounds() override {
     70         return SkRect::MakeLargest();
     71     }
     72     virtual void onDraw(SkCanvas* canvas) override;
     73 private:
     74     void drawShadow(SkCanvas* canvas, RenderNodeDrawable* caster);
     75     StartReorderBarrierDrawable* mStartBarrier;
     76 };
     77 
     78 }; // namespace skiapipeline
     79 }; // namespace uirenderer
     80 }; // namespace android
     81