1 // Copyright 2020 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_SRGB(50_percent_gray, 530, 150, false, 0, 0, false) {
make_bw_dither()5 static sk_sp<SkShader> make_bw_dither() {
6 auto surf = SkSurface::MakeRasterN32Premul(2, 2);
7 surf->getCanvas()->drawColor(SK_ColorWHITE);
8 surf->getCanvas()->drawRect({0, 0, 1, 1}, SkPaint());
9 surf->getCanvas()->drawRect({1, 1, 2, 2}, SkPaint());
10 return surf->makeImageSnapshot()->makeShader(SkTileMode::kRepeat,
11 SkTileMode::kRepeat,
12 SkSamplingOptions(SkFilterMode::kLinear));
13 }
14
draw(SkCanvas * canvas)15 void draw(SkCanvas* canvas) {
16 canvas->drawColor(SK_ColorWHITE);
17 SkFont font(nullptr, 12);
18
19 // BW Dither
20 canvas->translate(5, 5);
21 SkPaint p;
22 p.setShader(make_bw_dither());
23 canvas->drawRect({0, 0, 100, 100}, p);
24 SkPaint black;
25 canvas->drawString("BW Dither", 0, 125, font, black);
26
27 // Scaled BW Dither
28 canvas->translate(105, 0);
29 canvas->save();
30 canvas->scale(0.5, 0.5);
31 canvas->drawRect({0, 0, 200, 200}, p);
32 canvas->restore();
33 canvas->drawString("Scaled Dither", 0, 125, font, black);
34
35 // Blend black on to white
36 canvas->translate(105, 0);
37 p.setColor(0x80000000);
38 p.setShader(nullptr);
39 canvas->drawRect({0, 0, 100, 100}, p);
40 p.setShader(nullptr);
41 canvas->drawString("Blend", 0, 125, font, black);
42
43 // Opaque color (0xFFBCBCBC)
44 canvas->translate(105, 0);
45 p.setColor(0xFFBCBCBC);
46 canvas->drawRect({0, 0, 100, 100}, p);
47 canvas->drawString("0xFFBCBCBC", 0, 125, font, black);
48
49 // Opaque color (0xFF808080)
50 canvas->translate(105, 0);
51 p.setColor(0xFF808080);
52 canvas->drawRect({0, 0, 100, 100}, p);
53 canvas->drawString("0xFF808080", 0, 125, font, black);
54 }
55 } // END FIDDLE
56