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      1 
      2 /*
      3  * Copyright 2013 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "SampleCode.h"
      9 #include "SkCanvas.h"
     10 #include "SkDevice.h"
     11 #include "SkPaint.h"
     12 #include "SkRandom.h"
     13 #include "SkShader.h"
     14 #include "SkView.h"
     15 
     16 /**
     17  * Animated sample used to develop batched rect implementation in GrInOrderDrawBuffer.
     18  */
     19 class ManyRectsView : public SampleView {
     20 private:
     21     enum {
     22         N = 1000,
     23     };
     24 
     25 public:
     26     ManyRectsView() {}
     27 
     28 protected:
     29     virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
     30         if (SampleCode::TitleQ(*evt)) {
     31             SampleCode::TitleR(evt, "ManyRects");
     32             return true;
     33         }
     34         return this->INHERITED::onQuery(evt);
     35     }
     36 
     37     virtual void onDrawContent(SkCanvas* canvas) {
     38         SkISize dsize = canvas->getDeviceSize();
     39         canvas->clear(0xFFF0E0F0);
     40 
     41         for (int i = 0; i < N; ++i) {
     42             SkRect rect = SkRect::MakeWH(SkIntToScalar(fRandom.nextRangeU(10, 100)),
     43                                          SkIntToScalar(fRandom.nextRangeU(10, 100)));
     44             int x = fRandom.nextRangeU(0, dsize.fWidth);
     45             int y = fRandom.nextRangeU(0, dsize.fHeight);
     46             canvas->save();
     47 
     48             canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
     49             // Rotation messes up the GPU batching because of the clip below. We don't notice
     50             // that the rect is inside the clip so the clip changes interrupt batching.
     51             if (false) {
     52                 SkMatrix rotate;
     53                 rotate.setRotate(fRandom.nextUScalar1() * 360,
     54                                  SkIntToScalar(x) + SkScalarHalf(rect.fRight),
     55                                  SkIntToScalar(y) + SkScalarHalf(rect.fBottom));
     56                 canvas->concat(rotate);
     57             }
     58             SkRect clipRect = rect;
     59             // This clip will always contain the entire rect. It's here to give the GPU batching
     60             // code a little more challenge.
     61             clipRect.outset(10, 10);
     62             canvas->clipRect(clipRect);
     63             SkPaint paint;
     64             paint.setColor(fRandom.nextU());
     65             canvas->drawRect(rect, paint);
     66             canvas->restore();
     67         }
     68         this->inval(NULL);
     69     }
     70 
     71 private:
     72     SkRandom fRandom;
     73     typedef SampleView INHERITED;
     74 };
     75 
     76 //////////////////////////////////////////////////////////////////////////////
     77 
     78 static SkView* MyFactory() { return new ManyRectsView; }
     79 static SkViewRegister reg(MyFactory);
     80