blurrect.cpp revision 3458716b52aa25dcd1b270141c7628c380696e35
1/* 2 * Copyright 2012 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 "SkBlurMaskFilter.h" 10#include "SkCanvas.h" 11#include "SkPath.h" 12 13#define STROKE_WIDTH SkIntToScalar(10) 14 15typedef void (*Proc)(SkCanvas*, const SkRect&, const SkPaint&); 16 17static void fill_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) { 18 canvas->drawRect(r, p); 19} 20 21static void stroke_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) { 22 SkPaint paint(p); 23 paint.setStyle(SkPaint::kStroke_Style); 24 paint.setStrokeWidth(STROKE_WIDTH); 25 canvas->drawRect(r, paint); 26} 27 28static void draw_donut(SkCanvas* canvas, const SkRect& r, const SkPaint& p) { 29 SkRect rect; 30 SkPath path; 31 32 rect = r; 33 rect.outset(STROKE_WIDTH/2, STROKE_WIDTH/2); 34 path.addRect(rect); 35 rect = r; 36 rect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2); 37 38 path.addRect(rect); 39 path.setFillType(SkPath::kEvenOdd_FillType); 40 41 canvas->drawPath(path, p); 42} 43 44static void draw_donut_skewed(SkCanvas* canvas, const SkRect& r, const SkPaint& p) { 45 SkRect rect; 46 SkPath path; 47 48 rect = r; 49 rect.outset(STROKE_WIDTH/2, STROKE_WIDTH/2); 50 path.addRect(rect); 51 rect = r; 52 rect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2); 53 54 rect.offset(7, -7); 55 56 path.addRect(rect); 57 path.setFillType(SkPath::kEvenOdd_FillType); 58 59 canvas->drawPath(path, p); 60} 61 62class BlurRectGM : public skiagm::GM { 63 SkAutoTUnref<SkMaskFilter> fMaskFilter; 64public: 65 BlurRectGM() : 66 fMaskFilter(SkBlurMaskFilter::Create(STROKE_WIDTH/2, 67 SkBlurMaskFilter::kNormal_BlurStyle, 68 SkBlurMaskFilter::kHighQuality_BlurFlag)) 69 {} 70 71protected: 72 virtual SkString onShortName() { 73 return SkString("blurrect"); 74 } 75 76 virtual SkISize onISize() { 77 return SkISize::Make(640, 480); 78 } 79 80 virtual void onDraw(SkCanvas* canvas) { 81 canvas->translate(STROKE_WIDTH*3/2, STROKE_WIDTH*3/2); 82 83 SkPaint paint; 84 paint.setMaskFilter(fMaskFilter); 85 86 static const Proc procs[] = { 87 fill_rect, draw_donut, draw_donut_skewed 88 }; 89 90 SkRect r = { 0, 0, 250, 120 }; 91 92 this->drawProcs(canvas, r, paint, false, procs, SK_ARRAY_COUNT(procs)); 93 canvas->translate(r.width() * 4/3, 0); 94 this->drawProcs(canvas, r, paint, true, procs, SK_ARRAY_COUNT(procs)); 95 } 96 97 virtual uint32_t onGetFlags() const { return kSkipPipe_Flag; } 98 99private: 100 void drawProcs(SkCanvas* canvas, const SkRect& r, const SkPaint& paint, 101 bool doClip, const Proc procs[], size_t procsCount) { 102 SkAutoCanvasRestore acr(canvas, true); 103 for (size_t i = 0; i < procsCount; ++i) { 104 if (doClip) { 105 SkRect clipRect(r); 106 clipRect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2); 107 canvas->save(); 108 canvas->clipRect(r); 109 } 110 procs[i](canvas, r, paint); 111 if (doClip) { 112 canvas->restore(); 113 } 114 canvas->translate(0, r.height() * 4/3); 115 } 116 } 117 118 typedef GM INHERITED; 119}; 120 121////////////////////////////////////////////////////////////////////////////// 122 123DEF_GM(return new BlurRectGM;) 124 125