1*c8dee2aaSAndroid Build Coastguard Worker // Copyright 2020 Google LLC.
2*c8dee2aaSAndroid Build Coastguard Worker // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3*c8dee2aaSAndroid Build Coastguard Worker #include "tools/fiddle/examples.h"
4*c8dee2aaSAndroid Build Coastguard Worker REG_FIDDLE(shader_alphaimage, 256, 256, false, 0) {
alpha_image()5*c8dee2aaSAndroid Build Coastguard Worker sk_sp<SkImage> alpha_image() {
6*c8dee2aaSAndroid Build Coastguard Worker auto s = SkSurfaces::Raster(SkImageInfo::MakeA8(128, 128));
7*c8dee2aaSAndroid Build Coastguard Worker s->getCanvas()->clear(SkColorSetARGB(0xF0, 0x00, 0x00, 0x00));
8*c8dee2aaSAndroid Build Coastguard Worker return s->makeImageSnapshot();
9*c8dee2aaSAndroid Build Coastguard Worker }
linear_gradient()10*c8dee2aaSAndroid Build Coastguard Worker sk_sp<SkShader> linear_gradient() {
11*c8dee2aaSAndroid Build Coastguard Worker SkPoint gpts[2] = {{0, 0}, {256, 256}};
12*c8dee2aaSAndroid Build Coastguard Worker SkColor gc[6] = {SK_ColorCYAN, SK_ColorBLUE, SK_ColorMAGENTA,
13*c8dee2aaSAndroid Build Coastguard Worker SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN};
14*c8dee2aaSAndroid Build Coastguard Worker return SkGradientShader::MakeLinear(gpts, gc, nullptr, 6, SkTileMode::kClamp);
15*c8dee2aaSAndroid Build Coastguard Worker }
16*c8dee2aaSAndroid Build Coastguard Worker
draw(SkCanvas * canvas)17*c8dee2aaSAndroid Build Coastguard Worker void draw(SkCanvas* canvas) {
18*c8dee2aaSAndroid Build Coastguard Worker canvas->clear(SK_ColorLTGRAY);
19*c8dee2aaSAndroid Build Coastguard Worker SkPaint p;
20*c8dee2aaSAndroid Build Coastguard Worker p.setShader(linear_gradient());
21*c8dee2aaSAndroid Build Coastguard Worker auto i = alpha_image();
22*c8dee2aaSAndroid Build Coastguard Worker canvas->drawImage(i.get(), 128, 0, SkSamplingOptions(), &p);
23*c8dee2aaSAndroid Build Coastguard Worker canvas->drawRect({0, 128, 128, 256}, p);
24*c8dee2aaSAndroid Build Coastguard Worker }
25*c8dee2aaSAndroid Build Coastguard Worker } // END FIDDLE
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