skia2/docs/examples/Dither_b.cpp

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// Copyright 2019 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"
// HASH=76d4d4a7931a48495e4d5f54e073be53
REG_FIDDLE(Dither_b, 256, 256, false, 0) {
void draw(SkCanvas* canvas) {
canvas->clear(0);
SkBitmap bm32;
bm32.allocPixels(SkImageInfo::Make(20, 10, kN32_SkColorType, kPremul_SkAlphaType));
SkCanvas c32(bm32);
SkPoint points[] = {{0, 0}, {20, 0}};
SkColor colors[] = {0xFF334455, 0xFF662211 };
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(
points, colors, nullptr, SK_ARRAY_COUNT(colors),
SkTileMode::kClamp));
paint.setDither(true);
auto img = bm32.asImage();
c32.drawPaint(paint);
canvas->scale(12, 12);
canvas->drawImage(img, 0, 0);
paint.setBlendMode(SkBlendMode::kPlus);
SkSamplingOptions sampling;
canvas->drawImage(img, 0, 11, sampling, &paint);
canvas->drawImage(img, 0, 11, sampling, &paint);
canvas->drawImage(img, 0, 11, sampling, &paint);
}
} // END FIDDLE