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