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 "SkBitmap.h" 11#include "SkBlurMask.h" 12#include "SkCanvas.h" 13#include "SkCornerPathEffect.h" 14#include "SkGradientShader.h" 15#include "SkGraphics.h" 16#include "SkPath.h" 17#include "SkRandom.h" 18#include "SkRegion.h" 19#include "SkShader.h" 20#include "SkUtils.h" 21#include "SkColorPriv.h" 22#include "SkColorFilter.h" 23#include "SkTime.h" 24#include "SkTypeface.h" 25 26#include "SkStream.h" 27#include "SkColorPriv.h" 28#include "SkBlurMaskFilter.h" 29 30static void setNamedTypeface(SkPaint* paint, const char name[]) { 31 paint->setTypeface(SkTypeface::MakeFromName(name, SkFontStyle())); 32} 33 34static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 35 36class XfermodesBlurView : public SampleView { 37 SkBitmap fBG; 38 SkBitmap fSrcB, fDstB; 39 40 void draw_mode(SkCanvas* canvas, SkBlendMode mode, int alpha, SkScalar x, SkScalar y) { 41 SkPaint p; 42 p.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, 43 SkBlurMask::ConvertRadiusToSigma(5), 44 SkBlurMaskFilter::kNone_BlurFlag)); 45 46 SkScalar ww = SkIntToScalar(W); 47 SkScalar hh = SkIntToScalar(H); 48 49 // draw a circle covering the upper 50 // left three quarters of the canvas 51 p.setColor(0xFFCC44FF); 52 SkRect r; 53 r.set(0, 0, ww*3/4, hh*3/4); 54 r.offset(x, y); 55 canvas->drawOval(r, p); 56 57 p.setBlendMode(mode); 58 59 // draw a square overlapping the circle 60 // in the lower right of the canvas 61 p.setColor(0x00AA6633 | alpha << 24); 62 r.set(ww/3, hh/3, ww*19/20, hh*19/20); 63 r.offset(x, y); 64 canvas->drawRect(r, p); 65 } 66 67public: 68 const static int W = 64; 69 const static int H = 64; 70 XfermodesBlurView() { 71 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType), 72 gBG, 4); 73 } 74 75protected: 76 // overrides from SkEventSink 77 virtual bool onQuery(SkEvent* evt) { 78 if (SampleCode::TitleQ(*evt)) { 79 SampleCode::TitleR(evt, "XfermodesBlur"); 80 return true; 81 } 82 return this->INHERITED::onQuery(evt); 83 } 84 85 virtual void onDrawContent(SkCanvas* canvas) { 86 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 87 88 if (false) { 89 SkPaint paint; 90 paint.setAntiAlias(true); 91 paint.setTextSize(50); 92 paint.setTypeface(SkTypeface::MakeFromName("Arial Unicode MS", SkFontStyle())); 93 char buffer[10]; 94 size_t len = SkUTF8_FromUnichar(0x8500, buffer); 95 canvas->drawText(buffer, len, 40, 40, paint); 96 return; 97 } 98 if (false) { 99 SkPaint paint; 100 paint.setAntiAlias(true); 101 102 SkRect r0 = { 0, 0, 10.5f, 20 }; 103 SkRect r1 = { 10.5f, 10, 20, 30 }; 104 paint.setColor(SK_ColorRED); 105 canvas->drawRect(r0, paint); 106 paint.setColor(SK_ColorBLUE); 107 canvas->drawRect(r1, paint); 108 return; 109 } 110 111 const SkBlendMode gModes[] = { 112 SkBlendMode::kClear, 113 SkBlendMode::kSrc, 114 SkBlendMode::kDst, 115 SkBlendMode::kSrcOver, 116 SkBlendMode::kDstOver, 117 SkBlendMode::kSrcIn, 118 SkBlendMode::kDstIn, 119 SkBlendMode::kSrcOut, 120 SkBlendMode::kDstOut, 121 SkBlendMode::kSrcATop, 122 SkBlendMode::kDstATop, 123 SkBlendMode::kXor, 124 SkBlendMode::kPlus, 125 }; 126 127 const SkScalar w = SkIntToScalar(W); 128 const SkScalar h = SkIntToScalar(H); 129 SkMatrix m; 130 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 131 auto s = SkShader::MakeBitmapShader(fBG, SkShader::kRepeat_TileMode, 132 SkShader::kRepeat_TileMode, &m); 133 134 SkPaint labelP; 135 labelP.setAntiAlias(true); 136 labelP.setLCDRenderText(true); 137 labelP.setTextAlign(SkPaint::kCenter_Align); 138 setNamedTypeface(&labelP, "Menlo Regular"); 139 140 const int W = 5; 141 142 SkScalar x0 = 0; 143 for (int twice = 0; twice < 2; twice++) { 144 SkScalar x = x0, y = 0; 145 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 146 SkRect r; 147 r.set(x, y, x+w, y+h); 148 149 SkPaint p; 150 p.setStyle(SkPaint::kFill_Style); 151 p.setShader(s); 152 canvas->drawRect(r, p); 153 154 canvas->saveLayer(&r, nullptr); 155 draw_mode(canvas, gModes[i], twice ? 0x88 : 0xFF, r.fLeft, r.fTop); 156 canvas->restore(); 157 158 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 159 p.setStyle(SkPaint::kStroke_Style); 160 p.setShader(nullptr); 161 canvas->drawRect(r, p); 162 163 const char* label = SkBlendMode_Name(gModes[i]); 164 canvas->drawString(label, 165 x + w/2, y - labelP.getTextSize()/2, labelP); 166 x += w + SkIntToScalar(10); 167 if ((i % W) == W - 1) { 168 x = x0; 169 y += h + SkIntToScalar(30); 170 } 171 } 172 x0 += SkIntToScalar(400); 173 } 174 } 175 176private: 177 typedef SampleView INHERITED; 178}; 179 180////////////////////////////////////////////////////////////////////////////// 181 182static SkView* MyFactory() { return new XfermodesBlurView; } 183static SkViewRegister reg(MyFactory); 184