1cb93a386Sopenharmony_ci// Copyright 2020 Google LLC. 2cb93a386Sopenharmony_ci// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. 3cb93a386Sopenharmony_ci#include "tools/fiddle/examples.h" 4cb93a386Sopenharmony_ciREG_FIDDLE(shader_alphaimage, 256, 256, false, 0) { 5cb93a386Sopenharmony_cisk_sp<SkImage> alpha_image() { 6cb93a386Sopenharmony_ci auto s = SkSurface::MakeRaster(SkImageInfo::MakeA8(128, 128)); 7cb93a386Sopenharmony_ci s->getCanvas()->clear(SkColorSetARGB(0xF0, 0x00, 0x00, 0x00)); 8cb93a386Sopenharmony_ci return s->makeImageSnapshot(); 9cb93a386Sopenharmony_ci} 10cb93a386Sopenharmony_cisk_sp<SkShader> linear_gradient() { 11cb93a386Sopenharmony_ci SkPoint gpts[2] = {{0, 0}, {256, 256}}; 12cb93a386Sopenharmony_ci SkColor gc[6] = {SK_ColorCYAN, SK_ColorBLUE, SK_ColorMAGENTA, 13cb93a386Sopenharmony_ci SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN}; 14cb93a386Sopenharmony_ci return SkGradientShader::MakeLinear(gpts, gc, nullptr, 6, SkTileMode::kClamp); 15cb93a386Sopenharmony_ci} 16cb93a386Sopenharmony_ci 17cb93a386Sopenharmony_civoid draw(SkCanvas* canvas) { 18cb93a386Sopenharmony_ci canvas->clear(SK_ColorLTGRAY); 19cb93a386Sopenharmony_ci SkPaint p; 20cb93a386Sopenharmony_ci p.setShader(linear_gradient()); 21cb93a386Sopenharmony_ci auto i = alpha_image(); 22cb93a386Sopenharmony_ci canvas->drawImage(i.get(), 128, 0, SkSamplingOptions(), &p); 23cb93a386Sopenharmony_ci canvas->drawRect({0, 128, 128, 256}, p); 24cb93a386Sopenharmony_ci} 25cb93a386Sopenharmony_ci} // END FIDDLE 26