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 "Resources.h" 10 11 #include "SkImageDecoder.h" 12 #include "SkAvoidXfermode.h" 13 #include "SkStream.h" 14 15 class AvoidXfermodeGM : public skiagm::GM { 16 public: AvoidXfermodeGM()17 AvoidXfermodeGM() { } 18 19 protected: onShortName()20 SkString onShortName() override { 21 return SkString("avoidxfermode"); 22 } 23 onISize()24 SkISize onISize() override { return SkISize::Make(128, 128); } 25 onOnceBeforeDraw()26 void onOnceBeforeDraw() override { 27 SkImageDecoder* codec = nullptr; 28 SkString resourcePath = GetResourcePath("color_wheel.png"); 29 SkFILEStream stream(resourcePath.c_str()); 30 if (stream.isValid()) { 31 codec = SkImageDecoder::Factory(&stream); 32 } 33 if (codec) { 34 stream.rewind(); 35 codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode); 36 delete codec; 37 } else { 38 fBM.allocN32Pixels(1, 1); 39 fBM.eraseARGB(255, 255, 0 , 0); // red == bad 40 } 41 } 42 onDraw(SkCanvas * canvas)43 void onDraw(SkCanvas* canvas) override { 44 canvas->drawBitmap(fBM, 0, 0); 45 46 SkRect r = SkRect::MakeIWH(64, 64); 47 48 // UL corner: replace white with black with a tight tolerance 49 SkPaint p1; 50 p1.setColor(SK_ColorBLACK); 51 p1.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE, 52 5, 53 SkAvoidXfermode::kTargetColor_Mode))->unref(); 54 55 canvas->drawRect(r, p1); 56 57 r.offsetTo(64, 0.0f); 58 59 // UR corner: draw black everywhere except white with a tight tolerance 60 SkPaint p2; 61 p2.setColor(SK_ColorBLACK); 62 p2.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE, 63 250, 64 SkAvoidXfermode::kAvoidColor_Mode))->unref(); 65 66 canvas->drawRect(r, p2); 67 68 r.offsetTo(0.0f, 64); 69 70 // LL corner: replace red with transparent blue with a loose tolerance 71 SkPaint p3; 72 p3.setColor(0x7F0000FF); 73 p3.setXfermode(SkAvoidXfermode::Create(SK_ColorRED, 74 250, 75 SkAvoidXfermode::kTargetColor_Mode))->unref(); 76 77 canvas->drawRect(r, p3); 78 79 r.offsetTo(64, 64); 80 81 // LR corner: draw black everywhere except red with a loose tolerance 82 SkPaint p4; 83 p4.setColor(SK_ColorBLACK); 84 p4.setXfermode(SkAvoidXfermode::Create(SK_ColorRED, 85 5, 86 SkAvoidXfermode::kAvoidColor_Mode))->unref(); 87 88 canvas->drawRect(r, p4); 89 } 90 91 private: 92 SkBitmap fBM; 93 94 typedef GM INHERITED; 95 }; 96 97 ////////////////////////////////////////////////////////////////////////////// 98 99 DEF_GM(return new AvoidXfermodeGM;) 100