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
5 REG_FIDDLE(Modulate, 256, 256, false, 0) {
draw(SkCanvas * canvas)6 void 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