1 /* 2 * Copyright 2011 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 "SampleCode.h" 9 #include "SkView.h" 10 #include "SkBlurMask.h" 11 #include "SkCanvas.h" 12 #include "SkCornerPathEffect.h" 13 #include "SkGradientShader.h" 14 #include "SkGraphics.h" 15 #include "SkPath.h" 16 #include "SkRandom.h" 17 #include "SkRegion.h" 18 #include "SkShader.h" 19 #include "SkUtils.h" 20 #include "SkColorPriv.h" 21 #include "SkColorFilter.h" 22 #include "SkTime.h" 23 #include "SkTypeface.h" 24 25 #include "SkStream.h" 26 #include "SkColorPriv.h" 27 #include "SkBlurMaskFilter.h" 28 29 static void setNamedTypeface(SkPaint* paint, const char name[]) { 30 paint->setTypeface(SkTypeface::MakeFromName(name, SkFontStyle())); 31 } 32 33 static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 34 35 class XfermodesBlurView : public SampleView { 36 SkBitmap fBG; 37 SkBitmap fSrcB, fDstB; 38 39 void draw_mode(SkCanvas* canvas, SkBlendMode mode, int alpha, SkScalar x, SkScalar y) { 40 SkPaint p; 41 p.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, 42 SkBlurMask::ConvertRadiusToSigma(5), 43 SkBlurMaskFilter::kNone_BlurFlag)); 44 45 SkScalar ww = SkIntToScalar(W); 46 SkScalar hh = SkIntToScalar(H); 47 48 // draw a circle covering the upper 49 // left three quarters of the canvas 50 p.setColor(0xFFCC44FF); 51 SkRect r; 52 r.set(0, 0, ww*3/4, hh*3/4); 53 r.offset(x, y); 54 canvas->drawOval(r, p); 55 56 p.setBlendMode(mode); 57 58 // draw a square overlapping the circle 59 // in the lower right of the canvas 60 p.setColor(0x00AA6633 | alpha << 24); 61 r.set(ww/3, hh/3, ww*19/20, hh*19/20); 62 r.offset(x, y); 63 canvas->drawRect(r, p); 64 } 65 66 public: 67 const static int W = 64; 68 const static int H = 64; 69 XfermodesBlurView() { 70 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType), 71 gBG, 4); 72 } 73 74 protected: 75 // overrides from SkEventSink 76 virtual bool onQuery(SkEvent* evt) { 77 if (SampleCode::TitleQ(*evt)) { 78 SampleCode::TitleR(evt, "XfermodesBlur"); 79 return true; 80 } 81 return this->INHERITED::onQuery(evt); 82 } 83 84 virtual void onDrawContent(SkCanvas* canvas) { 85 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 86 87 if (false) { 88 SkPaint paint; 89 paint.setAntiAlias(true); 90 paint.setTextSize(50); 91 paint.setTypeface(SkTypeface::MakeFromName("Arial Unicode MS", SkFontStyle())); 92 char buffer[10]; 93 size_t len = SkUTF8_FromUnichar(0x8500, buffer); 94 canvas->drawText(buffer, len, 40, 40, paint); 95 return; 96 } 97 if (false) { 98 SkPaint paint; 99 paint.setAntiAlias(true); 100 101 SkRect r0 = { 0, 0, 10.5f, 20 }; 102 SkRect r1 = { 10.5f, 10, 20, 30 }; 103 paint.setColor(SK_ColorRED); 104 canvas->drawRect(r0, paint); 105 paint.setColor(SK_ColorBLUE); 106 canvas->drawRect(r1, paint); 107 return; 108 } 109 110 const SkBlendMode gModes[] = { 111 SkBlendMode::kClear, 112 SkBlendMode::kSrc, 113 SkBlendMode::kDst, 114 SkBlendMode::kSrcOver, 115 SkBlendMode::kDstOver, 116 SkBlendMode::kSrcIn, 117 SkBlendMode::kDstIn, 118 SkBlendMode::kSrcOut, 119 SkBlendMode::kDstOut, 120 SkBlendMode::kSrcATop, 121 SkBlendMode::kDstATop, 122 SkBlendMode::kXor, 123 SkBlendMode::kPlus, 124 }; 125 126 const SkScalar w = SkIntToScalar(W); 127 const SkScalar h = SkIntToScalar(H); 128 SkMatrix m; 129 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 130 auto s = SkShader::MakeBitmapShader(fBG, SkShader::kRepeat_TileMode, 131 SkShader::kRepeat_TileMode, &m); 132 133 SkPaint labelP; 134 labelP.setAntiAlias(true); 135 labelP.setLCDRenderText(true); 136 labelP.setTextAlign(SkPaint::kCenter_Align); 137 setNamedTypeface(&labelP, "Menlo Regular"); 138 139 const int W = 5; 140 141 SkScalar x0 = 0; 142 for (int twice = 0; twice < 2; twice++) { 143 SkScalar x = x0, y = 0; 144 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 145 SkRect r; 146 r.set(x, y, x+w, y+h); 147 148 SkPaint p; 149 p.setStyle(SkPaint::kFill_Style); 150 p.setShader(s); 151 canvas->drawRect(r, p); 152 153 canvas->saveLayer(&r, nullptr); 154 draw_mode(canvas, gModes[i], twice ? 0x88 : 0xFF, r.fLeft, r.fTop); 155 canvas->restore(); 156 157 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 158 p.setStyle(SkPaint::kStroke_Style); 159 p.setShader(nullptr); 160 canvas->drawRect(r, p); 161 162 const char* label = SkBlendMode_Name(gModes[i]); 163 canvas->drawString(label, 164 x + w/2, y - labelP.getTextSize()/2, labelP); 165 x += w + SkIntToScalar(10); 166 if ((i % W) == W - 1) { 167 x = x0; 168 y += h + SkIntToScalar(30); 169 } 170 } 171 x0 += SkIntToScalar(400); 172 } 173 } 174 175 private: 176 typedef SampleView INHERITED; 177 }; 178 179 ////////////////////////////////////////////////////////////////////////////// 180 181 static SkView* MyFactory() { return new XfermodesBlurView; } 182 static SkViewRegister reg(MyFactory); 183
