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
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