1// Copyright 2019 Google LLC. 2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. 3#include "tools/fiddle/examples.h" 4// HASH=3fdac2b2f48bd227d2e74234c260bc8e 5REG_FIDDLE(Modulate, 256, 256, false, 0) { 6void draw(SkCanvas* canvas) { 7 auto drawSquare = [=](int dx, int dy, SkBlendMode mode, const char* label) -> void { 8 const SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE }; 9 const SkPoint horz[] = { { 0, 0 }, { 128, 0 } }; 10 SkPaint paint; 11 paint.setShader(SkGradientShader::MakeLinear(horz, colors, nullptr, SK_ARRAY_COUNT(colors), 12 SkTileMode::kClamp)); 13 paint.setBlendMode(mode); 14 canvas->translate(dx, dy); 15 canvas->drawRect({0, 0, 128, 128}, paint); 16 paint.setBlendMode(SkBlendMode::kXor); 17 SkFont font; 18 canvas->drawString(label, 40, 100, font, paint); 19 }; 20 drawSquare(0, 0, SkBlendMode::kSrc, "destination"); 21 drawSquare(128, 0, SkBlendMode::kSrc, ""); 22 drawSquare(0, 128, SkBlendMode::kSrc, ""); 23 canvas->translate(-128, -128); 24 canvas->rotate(90, 0, 128); 25 drawSquare(0, 0, SkBlendMode::kSrc, "source"); 26 drawSquare(0, -128, SkBlendMode::kModulate, "modulate"); 27 drawSquare(-128, 0, SkBlendMode::kMultiply, "multiply"); 28} 29} // END FIDDLE 30