| // Copyright 2020 Google LLC. |
| // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. |
| #include "tools/fiddle/examples.h" |
| REG_FIDDLE(shader_alphaimage, 256, 256, false, 0) { |
| sk_sp<SkImage> alpha_image() { |
| auto s = SkSurfaces::Raster(SkImageInfo::MakeA8(128, 128)); |
| s->getCanvas()->clear(SkColorSetARGB(0xF0, 0x00, 0x00, 0x00)); |
| return s->makeImageSnapshot(); |
| } |
| sk_sp<SkShader> linear_gradient() { |
| SkPoint gpts[2] = {{0, 0}, {256, 256}}; |
| SkColor gc[6] = {SK_ColorCYAN, SK_ColorBLUE, SK_ColorMAGENTA, |
| SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN}; |
| return SkGradientShader::MakeLinear(gpts, gc, nullptr, 6, SkTileMode::kClamp); |
| } |
| |
| void draw(SkCanvas* canvas) { |
| canvas->clear(SK_ColorLTGRAY); |
| SkPaint p; |
| p.setShader(linear_gradient()); |
| auto i = alpha_image(); |
| canvas->drawImage(i.get(), 128, 0, SkSamplingOptions(), &p); |
| canvas->drawRect({0, 128, 128, 256}, p); |
| } |
| } // END FIDDLE |