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      1 /*
      2  * Copyright 2016 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 "SkBlurImageFilter.h"
     10 #include "SkRRect.h"
     11 #include "SkSurface.h"
     12 #include "SkClipOpPriv.h"
     13 #include "sk_tool_utils.h"
     14 
     15 #define WIDTH 512
     16 #define HEIGHT 512
     17 
     18 namespace skiagm {
     19 
     20 class ComplexClipBlurTiledGM : public GM {
     21 public:
     22     ComplexClipBlurTiledGM() {
     23     }
     24 
     25 protected:
     26     SkString onShortName() override {
     27         return SkString("complexclip_blur_tiled");
     28     }
     29 
     30     SkISize onISize() override {
     31         return SkISize::Make(WIDTH, HEIGHT);
     32     }
     33 
     34     void onDraw(SkCanvas* canvas) override {
     35         SkPaint blurPaint;
     36         blurPaint.setImageFilter(SkBlurImageFilter::Make(5.0f, 5.0f, nullptr));
     37         const SkScalar tileSize = SkIntToScalar(128);
     38         SkRect bounds = canvas->getLocalClipBounds();
     39         int ts = SkScalarCeilToInt(tileSize);
     40         SkImageInfo info = SkImageInfo::MakeN32Premul(ts, ts);
     41         auto tileSurface(sk_tool_utils::makeSurface(canvas, info));
     42         SkCanvas* tileCanvas = tileSurface->getCanvas();
     43         for (SkScalar y = bounds.top(); y < bounds.bottom(); y += tileSize) {
     44             for (SkScalar x = bounds.left(); x < bounds.right(); x += tileSize) {
     45                 tileCanvas->save();
     46                 tileCanvas->clear(0);
     47                 tileCanvas->translate(-x, -y);
     48                 SkRect rect = SkRect::MakeWH(WIDTH, HEIGHT);
     49                 tileCanvas->saveLayer(&rect, &blurPaint);
     50                 SkRRect rrect = SkRRect::MakeRectXY(rect.makeInset(20, 20), 25, 25);
     51                 tileCanvas->clipRRect(rrect, kDifference_SkClipOp, true);
     52                 SkPaint paint;
     53                 tileCanvas->drawRect(rect, paint);
     54                 tileCanvas->restore();
     55                 tileCanvas->restore();
     56                 canvas->drawImage(tileSurface->makeImageSnapshot().get(), x, y);
     57             }
     58         }
     59     }
     60 
     61 private:
     62     typedef GM INHERITED;
     63 };
     64 
     65 //////////////////////////////////////////////////////////////////////////////
     66 
     67 DEF_GM(return new ComplexClipBlurTiledGM;)
     68 
     69 }
     70