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