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 REG_FIDDLE(Modulate, 256, 256, false, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6 auto drawSquare = [=](int dx, int dy, SkBlendMode mode, const char* label) -> void {
7 const SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE };
8 const SkPoint horz[] = { { 0, 0 }, { 128, 0 } };
9 SkPaint paint;
10 paint.setShader(SkGradientShader::MakeLinear(horz, colors, nullptr, std::size(colors),
11 SkTileMode::kClamp));
12 paint.setBlendMode(mode);
13 canvas->translate(dx, dy);
14 canvas->drawRect({0, 0, 128, 128}, paint);
15 paint.setBlendMode(SkBlendMode::kXor);
16 SkFont font = SkFont(fontMgr->matchFamilyStyle(nullptr, {}));
17 canvas->drawString(label, 40, 100, font, paint);
18 };
19 drawSquare(0, 0, SkBlendMode::kSrc, "destination");
20 drawSquare(128, 0, SkBlendMode::kSrc, "");
21 drawSquare(0, 128, SkBlendMode::kSrc, "");
22 canvas->translate(-128, -128);
23 canvas->rotate(90, 0, 128);
24 drawSquare(0, 0, SkBlendMode::kSrc, "source");
25 drawSquare(0, -128, SkBlendMode::kModulate, "modulate");
26 drawSquare(-128, 0, SkBlendMode::kMultiply, "multiply");
27 }
28 } // END FIDDLE
29