blob: 71ec27c975096031d461a50f9de4d3aba8985658 [file] [log] [blame]
reed@google.com3d3a8602013-05-24 14:58:44 +00001/*
2 * Copyright 2013 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 "SkCanvas.h"
10#include "SkGradientShader.h"
11
12class AlphaGradientsGM : public skiagm::GM {
13public:
14 AlphaGradientsGM() {}
15
16protected:
mtklein36352bf2015-03-25 18:17:31 -070017 SkString onShortName() override {
reed@google.com3d3a8602013-05-24 14:58:44 +000018 return SkString("alphagradients");
19 }
20
mtklein36352bf2015-03-25 18:17:31 -070021 SkISize onISize() override {
reed@google.com3d3a8602013-05-24 14:58:44 +000022 return SkISize::Make(640, 480);
23 }
24
25 static void draw_grad(SkCanvas* canvas, const SkRect& r,
26 SkColor c0, SkColor c1, bool doPreMul) {
27 SkColor colors[] = { c0, c1 };
28 SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fBottom } };
29 SkPaint paint;
30 uint32_t flags = doPreMul ? SkGradientShader::kInterpolateColorsInPremul_Flag : 0;
halcanary96fcdcc2015-08-27 07:41:13 -070031 SkShader* s = SkGradientShader::CreateLinear(pts, colors, nullptr, 2,
32 SkShader::kClamp_TileMode, flags, nullptr);
reed@google.com3d3a8602013-05-24 14:58:44 +000033 paint.setShader(s)->unref();
34 canvas->drawRect(r, paint);
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000035
halcanary96fcdcc2015-08-27 07:41:13 -070036 paint.setShader(nullptr);
reed@google.com3d3a8602013-05-24 14:58:44 +000037 paint.setStyle(SkPaint::kStroke_Style);
38 canvas->drawRect(r, paint);
39 }
40
mtklein36352bf2015-03-25 18:17:31 -070041 void onDraw(SkCanvas* canvas) override {
reed@google.com3d3a8602013-05-24 14:58:44 +000042 static const struct {
43 SkColor fColor0;
44 SkColor fColor1;
45 } gRec[] = {
46 { 0xFFFFFFFF, 0x00000000 },
47 { 0xFFFFFFFF, 0x00FF0000 },
48 { 0xFFFFFFFF, 0x00FFFF00 },
49 { 0xFFFFFFFF, 0x00FFFFFF },
50 { 0xFFFF0000, 0x00000000 },
51 { 0xFFFF0000, 0x00FF0000 },
52 { 0xFFFF0000, 0x00FFFF00 },
53 { 0xFFFF0000, 0x00FFFFFF },
54 { 0xFF0000FF, 0x00000000 },
55 { 0xFF0000FF, 0x00FF0000 },
56 { 0xFF0000FF, 0x00FFFF00 },
57 { 0xFF0000FF, 0x00FFFFFF },
58 };
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000059
reed@google.com3d3a8602013-05-24 14:58:44 +000060 SkRect r = SkRect::MakeWH(300, 30);
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000061
reed@google.com3d3a8602013-05-24 14:58:44 +000062 canvas->translate(10, 10);
63
64 for (int doPreMul = 0; doPreMul <= 1; ++doPreMul) {
65 canvas->save();
66 for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
67 draw_grad(canvas, r, gRec[i].fColor0, gRec[i].fColor1, SkToBool(doPreMul));
68 canvas->translate(0, r.height() + 8);
69 }
70 canvas->restore();
71 canvas->translate(r.width() + 10, 0);
72 }
73 }
74
reed@google.com3d3a8602013-05-24 14:58:44 +000075private:
76 typedef skiagm::GM INHERITED;
77};
78
halcanary385fe4d2015-08-26 13:07:48 -070079DEF_GM(return new AlphaGradientsGM;)