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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "SkAlphaThresholdFilter.h"
     10 #include "SkRandom.h"
     11 
     12 #define WIDTH 500
     13 #define HEIGHT 500
     14 
     15 namespace skiagm {
     16 
     17 class ImageAlphaThresholdGM : public GM {
     18 public:
     19     ImageAlphaThresholdGM() {
     20         this->setBGColor(0xFFFFFFFF);
     21     }
     22 
     23 protected:
     24     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     25         return this->INHERITED::onGetFlags() |
     26                GM::kSkipTiled_Flag |
     27                GM::kSkipPicture_Flag |
     28                GM::kSkipPipe_Flag |
     29                GM::kSkipPipeCrossProcess_Flag;
     30     }
     31 
     32     virtual SkString onShortName() SK_OVERRIDE {
     33         return SkString("imagealphathreshold");
     34     }
     35 
     36     virtual SkISize onISize() SK_OVERRIDE {
     37         return SkISize::Make(WIDTH, HEIGHT);
     38     }
     39 
     40     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     41         SkIRect rects[2];
     42         rects[0] = SkIRect::MakeXYWH(0, 150, WIDTH, HEIGHT - 300);
     43         rects[1] = SkIRect::MakeXYWH(150, 0, WIDTH - 300, HEIGHT);
     44         SkRegion region;
     45         region.setRects(rects, 2);
     46 
     47         SkMatrix matrix;
     48         matrix.reset();
     49         matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
     50         matrix.postScale(.8f, .8f);
     51 
     52         canvas->concat(matrix);
     53 
     54         SkPaint paint;
     55         paint.setImageFilter(
     56             SkAlphaThresholdFilter::Create(region, 0.2f, 0.7f))->unref();
     57         canvas->saveLayer(NULL, &paint);
     58         paint.setAntiAlias(true);
     59 
     60         SkPaint rect_paint;
     61         rect_paint.setColor(0xFF0000FF);
     62         canvas->drawRect(SkRect::MakeXYWH(0, 0, WIDTH / 2, HEIGHT / 2),
     63                          rect_paint);
     64         rect_paint.setColor(0xBFFF0000);
     65         canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, 0, WIDTH / 2, HEIGHT / 2),
     66                          rect_paint);
     67         rect_paint.setColor(0x3F00FF00);
     68         canvas->drawRect(SkRect::MakeXYWH(0, HEIGHT / 2, WIDTH / 2, HEIGHT / 2),
     69                          rect_paint);
     70         rect_paint.setColor(0x00000000);
     71         canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, HEIGHT / 2, WIDTH / 2, HEIGHT / 2),
     72                          rect_paint);
     73 
     74         canvas->restore();
     75     }
     76 
     77 private:
     78     typedef GM INHERITED;
     79 };
     80 
     81 //////////////////////////////////////////////////////////////////////////////
     82 
     83 static GM* MyFactory(void*) { return new ImageAlphaThresholdGM; }
     84 static GMRegistry reg(MyFactory);
     85 
     86 }
     87