| // 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(alphaimage_shader_colorfilter, 256, 256, false, 0) { |
| sk_sp<SkImage> alpha_image() { |
| auto s = SkSurfaces::Raster(SkImageInfo::MakeA8(64, 64)); |
| s->getCanvas()->clear(SkColorSetARGB(0x80, 0x00, 0x00, 0x00)); |
| return s->makeImageSnapshot(); |
| } |
| sk_sp<SkShader> linear_gradient() { |
| SkPoint gpts[2] = {{0, 0}, {64, 64}}; |
| SkColor gc[3] = {SK_ColorRED, SK_ColorGREEN, SK_ColorMAGENTA}; |
| return SkGradientShader::MakeLinear(gpts, gc, nullptr, 3, (SkTileMode)0); |
| } |
| sk_sp<SkColorFilter> color_filter() { |
| SkScalar colorMatrix[20] = { |
| 1, 0, 0, 0, 0, |
| 0, 0, 1, 0, 0, |
| 0, 1, 0, 0, 0, |
| 0, 0, 0, 1, 0}; |
| return SkColorFilters::Matrix(colorMatrix); |
| } |
| void draw(SkCanvas* canvas) { |
| SkPaint p; |
| p.setShader(linear_gradient()); |
| p.setColorFilter(color_filter()); |
| auto i = alpha_image(); |
| canvas->scale(2, 2); |
| canvas->drawImage(i.get(), 32, 32, SkSamplingOptions(), &p); |
| } |
| } // END FIDDLE |