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      1 
      2 /*
      3  * Copyright 2011 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 
      9 
     10 
     11 #include "gm.h"
     12 #include "SkRandom.h"
     13 
     14 namespace skiagm {
     15 
     16 #define W   400
     17 #define H   400
     18 #define N   100
     19 
     20 static const SkScalar SW = SkIntToScalar(W);
     21 static const SkScalar SH = SkIntToScalar(H);
     22 
     23 class StrokeRectsGM : public GM {
     24 public:
     25     StrokeRectsGM() {}
     26 
     27 protected:
     28     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     29         return kSkipTiled_Flag;
     30     }
     31 
     32     virtual SkString onShortName() {
     33         return SkString("strokerects");
     34     }
     35 
     36     virtual SkISize onISize() {
     37         return SkISize::Make(W*2, H*2);
     38     }
     39 
     40     static void rnd_rect(SkRect* r, SkLCGRandom& rand) {
     41         SkScalar x = rand.nextUScalar1() * W;
     42         SkScalar y = rand.nextUScalar1() * H;
     43         SkScalar w = rand.nextUScalar1() * (W >> 2);
     44         SkScalar h = rand.nextUScalar1() * (H >> 2);
     45         SkScalar hoffset = rand.nextSScalar1();
     46         SkScalar woffset = rand.nextSScalar1();
     47 
     48         r->set(x, y, x + w, y + h);
     49         r->offset(-w/2 + woffset, -h/2 + hoffset);
     50     }
     51 
     52     virtual void onDraw(SkCanvas* canvas) {
     53         SkPaint paint;
     54         paint.setStyle(SkPaint::kStroke_Style);
     55 
     56         for (int y = 0; y < 2; y++) {
     57             paint.setAntiAlias(!!y);
     58             for (int x = 0; x < 2; x++) {
     59                 paint.setStrokeWidth(x * SkIntToScalar(3));
     60 
     61                 SkAutoCanvasRestore acr(canvas, true);
     62                 canvas->translate(SW * x, SH * y);
     63                 canvas->clipRect(SkRect::MakeLTRB(
     64                         SkIntToScalar(2), SkIntToScalar(2)
     65                         , SW - SkIntToScalar(2), SH - SkIntToScalar(2)
     66                 ));
     67 
     68                 SkLCGRandom rand;
     69                 for (int i = 0; i < N; i++) {
     70                     SkRect r;
     71                     rnd_rect(&r, rand);
     72                     canvas->drawRect(r, paint);
     73                 }
     74             }
     75         }
     76     }
     77 
     78 private:
     79     typedef GM INHERITED;
     80 };
     81 
     82 //////////////////////////////////////////////////////////////////////////////
     83 
     84 static GM* MyFactory(void*) { return new StrokeRectsGM; }
     85 static GMRegistry reg(MyFactory);
     86 
     87 }
     88