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      1 /*
      2  * Copyright 2017 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 "sk_tool_utils.h"
     10 #include "SkSurface.h"
     11 #include "SkBlurImageFilter.h"
     12 
     13 static sk_sp<SkImage> make_image(SkCanvas* canvas) {
     14     SkImageInfo info = SkImageInfo::MakeN32Premul(250, 200);
     15     auto surface = sk_tool_utils::makeSurface(canvas, info);
     16     SkCanvas* c = surface->getCanvas();
     17     SkPaint paint;
     18     paint.setAntiAlias(true);
     19 
     20     paint.setColor(SK_ColorBLUE);
     21     c->drawRect(SkRect::MakeIWH(info.width(), info.height()), paint);
     22     paint.setColor(SK_ColorGREEN);
     23     c->drawCircle(125, 100, 100, paint);
     24     paint.setColor(SK_ColorRED);
     25     c->drawRect(SkRect::MakeIWH(80, 80), paint);
     26 
     27     return surface->makeImageSnapshot();
     28 }
     29 
     30 static void draw_image(SkCanvas* canvas, const sk_sp<SkImage> image, sk_sp<SkImageFilter> filter) {
     31     SkAutoCanvasRestore acr(canvas, true);
     32     SkPaint paint;
     33     paint.setImageFilter(std::move(filter));
     34 
     35     canvas->translate(SkIntToScalar(30), 0);
     36     canvas->clipRect(SkRect::MakeIWH(image->width(),image->height()));
     37     canvas->drawImage(image, 0, 0, &paint);
     38 }
     39 
     40 namespace skiagm {
     41 
     42 // This GM draws one rectangle, one green inscribed circle, and one red square
     43 // with different blur settings.
     44 class ImageBlurClampModeGM : public GM {
     45 public:
     46     ImageBlurClampModeGM() {
     47         this->setBGColor(0xFFCCCCCC);
     48     }
     49 
     50 protected:
     51 
     52     SkString onShortName() override {
     53         return SkString("imageblurclampmode");
     54     }
     55 
     56     SkISize onISize() override {
     57         return SkISize::Make(850, 920);
     58     }
     59 
     60     bool runAsBench() const override { return true; }
     61 
     62     void onDraw(SkCanvas* canvas) override {
     63         sk_sp<SkImage> image(make_image(canvas));
     64         sk_sp<SkImageFilter> filter;
     65 
     66         canvas->translate(0, 30);
     67         // Test different kernel size, including the one to launch 2d Gaussian
     68         // blur.
     69         for (auto sigma: { 0.6f, 3.0f, 8.0f, 20.0f }) {
     70             canvas->save();
     71 
     72             // x-only blur
     73             filter =  SkBlurImageFilter::Make(sigma, 0.0f, nullptr, nullptr,
     74                                               SkBlurImageFilter::kClamp_TileMode);
     75             draw_image(canvas, image, std::move(filter));
     76             canvas->translate(image->width() + 20, 0);
     77 
     78             // y-only blur
     79             filter = SkBlurImageFilter::Make(0.0f, sigma, nullptr, nullptr,
     80                                              SkBlurImageFilter::kClamp_TileMode);
     81             draw_image(canvas, image, std::move(filter));
     82             canvas->translate(image->width() + 20, 0);
     83 
     84             // both directions
     85             filter = SkBlurImageFilter::Make(sigma, sigma, nullptr, nullptr,
     86                                              SkBlurImageFilter::kClamp_TileMode);
     87             draw_image(canvas, image, std::move(filter));
     88             canvas->translate(image->width() + 20, 0);
     89 
     90             canvas->restore();
     91 
     92             canvas->translate(0, image->height() + 20);
     93         }
     94     }
     95 
     96 private:
     97     typedef GM INHERITED;
     98 };
     99 
    100 //////////////////////////////////////////////////////////////////////////////
    101 
    102 DEF_GM(return new ImageBlurClampModeGM;)
    103 }
    104