robertphillips | 2a1d401 | 2016-01-29 08:44:17 -0800 | [diff] [blame] | 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: |
| 17 | AvoidXfermodeGM() { } |
| 18 | |
| 19 | protected: |
| 20 | SkString onShortName() override { |
| 21 | return SkString("avoidxfermode"); |
| 22 | } |
| 23 | |
| 24 | SkISize onISize() override { return SkISize::Make(128, 128); } |
| 25 | |
| 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 | |
| 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 | |
mtklein | f16e2a2 | 2016-02-03 06:42:16 -0800 | [diff] [blame] | 70 | // LL corner: replace red with blue with a loose tolerance |
robertphillips | 2a1d401 | 2016-01-29 08:44:17 -0800 | [diff] [blame] | 71 | SkPaint p3; |
mtklein | f16e2a2 | 2016-02-03 06:42:16 -0800 | [diff] [blame] | 72 | p3.setColor(SK_ColorBLUE); |
robertphillips | 2a1d401 | 2016-01-29 08:44:17 -0800 | [diff] [blame] | 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;) |