| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm.h" |
| #include "Resources.h" |
| |
| #include "SkImageDecoder.h" |
| #include "SkAvoidXfermode.h" |
| #include "SkStream.h" |
| |
| class AvoidXfermodeGM : public skiagm::GM { |
| public: |
| AvoidXfermodeGM() { } |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("avoidxfermode"); |
| } |
| |
| SkISize onISize() override { return SkISize::Make(128, 128); } |
| |
| void onOnceBeforeDraw() override { |
| SkImageDecoder* codec = nullptr; |
| SkString resourcePath = GetResourcePath("color_wheel.png"); |
| SkFILEStream stream(resourcePath.c_str()); |
| if (stream.isValid()) { |
| codec = SkImageDecoder::Factory(&stream); |
| } |
| if (codec) { |
| stream.rewind(); |
| codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode); |
| delete codec; |
| } else { |
| fBM.allocN32Pixels(1, 1); |
| fBM.eraseARGB(255, 255, 0 , 0); // red == bad |
| } |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| canvas->drawBitmap(fBM, 0, 0); |
| |
| SkRect r = SkRect::MakeIWH(64, 64); |
| |
| // UL corner: replace white with black with a tight tolerance |
| SkPaint p1; |
| p1.setColor(SK_ColorBLACK); |
| p1.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE, |
| 5, |
| SkAvoidXfermode::kTargetColor_Mode))->unref(); |
| |
| canvas->drawRect(r, p1); |
| |
| r.offsetTo(64, 0.0f); |
| |
| // UR corner: draw black everywhere except white with a tight tolerance |
| SkPaint p2; |
| p2.setColor(SK_ColorBLACK); |
| p2.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE, |
| 250, |
| SkAvoidXfermode::kAvoidColor_Mode))->unref(); |
| |
| canvas->drawRect(r, p2); |
| |
| r.offsetTo(0.0f, 64); |
| |
| // LL corner: replace red with blue with a loose tolerance |
| SkPaint p3; |
| p3.setColor(SK_ColorBLUE); |
| p3.setXfermode(SkAvoidXfermode::Create(SK_ColorRED, |
| 250, |
| SkAvoidXfermode::kTargetColor_Mode))->unref(); |
| |
| canvas->drawRect(r, p3); |
| |
| r.offsetTo(64, 64); |
| |
| // LR corner: draw black everywhere except red with a loose tolerance |
| SkPaint p4; |
| p4.setColor(SK_ColorBLACK); |
| p4.setXfermode(SkAvoidXfermode::Create(SK_ColorRED, |
| 5, |
| SkAvoidXfermode::kAvoidColor_Mode))->unref(); |
| |
| canvas->drawRect(r, p4); |
| } |
| |
| private: |
| SkBitmap fBM; |
| |
| typedef GM INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new AvoidXfermodeGM;) |