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1 /* | |
2 * Copyright 2016 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #include "gm.h" | |
9 #include "Resources.h" | |
10 | |
11 #include "SkPixelXorXfermode.h" | |
12 #include "SkStream.h" | |
13 | |
14 class PixelXorXfermodeGM : public skiagm::GM { | |
15 public: | |
16 PixelXorXfermodeGM() { } | |
17 | |
18 protected: | |
19 SkString onShortName() override { | |
20 return SkString("pixelxorxfermode"); | |
21 } | |
22 | |
23 SkISize onISize() override { return SkISize::Make(512, 512); } | |
24 | |
25 void onOnceBeforeDraw() override { | |
26 if (!GetResourceAsBitmap("mandrill_512.png", &fBM)) { | |
27 fBM.allocN32Pixels(1, 1); | |
28 fBM.eraseARGB(255, 255, 0 , 0); // red == bad | |
29 } | |
30 } | |
31 | |
32 void onDraw(SkCanvas* canvas) override { | |
33 canvas->drawBitmap(fBM, 0, 0); | |
34 | |
35 SkRect r = SkRect::MakeIWH(256, 256); | |
36 | |
37 // Negate the red channel of the dst (via the ancillary color) but leave | |
38 // the green & blue channels alone | |
39 SkPaint p1; | |
40 p1.setColor(SK_ColorBLACK); // noop | |
41 p1.setXfermode(SkPixelXorXfermode::Make(0x7FFF0000)); | |
42 | |
43 canvas->drawRect(r, p1); | |
44 | |
45 r.offsetTo(256.0f, 0.0f); | |
46 | |
47 // Negate the dst color via the src color | |
48 SkPaint p2; | |
49 p2.setColor(SK_ColorWHITE); | |
50 p2.setXfermode(SkPixelXorXfermode::Make(SK_ColorBLACK)); // noop | |
51 | |
52 canvas->drawRect(r, p2); | |
53 | |
54 r.offsetTo(0.0f, 256.0f); | |
55 | |
56 // Just return the original color | |
57 SkPaint p3; | |
58 p3.setColor(SK_ColorBLACK); // noop | |
59 p3.setXfermode(SkPixelXorXfermode::Make(SK_ColorBLACK)); // noop | |
60 | |
61 canvas->drawRect(r, p3); | |
62 | |
63 r.offsetTo(256.0f, 256.0f); | |
64 | |
65 // Negate the red & green channels (via the ancillary color) but leave | |
66 // the blue channel alone | |
67 SkPaint p4; | |
68 p4.setColor(SK_ColorBLACK); // noop | |
69 p4.setXfermode(SkPixelXorXfermode::Make(SK_ColorYELLOW)); | |
70 | |
71 canvas->drawRect(r, p4); | |
72 } | |
73 | |
74 private: | |
75 SkBitmap fBM; | |
76 | |
77 typedef GM INHERITED; | |
78 }; | |
79 | |
80 ////////////////////////////////////////////////////////////////////////////// | |
81 | |
82 DEF_GM(return new PixelXorXfermodeGM;) | |
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