blob: 304c523ac5e46909bd6f7d5cae862d13187261b0 [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:
mtklein72c9faa2015-01-09 10:06:39 -080017 SkString onShortName() SK_OVERRIDE {
reed@google.com3d3a8602013-05-24 14:58:44 +000018 return SkString("alphagradients");
19 }
20
mtklein72c9faa2015-01-09 10:06:39 -080021 SkISize onISize() SK_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;
31 SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2,
commit-bot@chromium.org83f23d82014-05-22 12:27:41 +000032 SkShader::kClamp_TileMode, flags, NULL);
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
reed@google.com3d3a8602013-05-24 14:58:44 +000036 paint.setShader(NULL);
37 paint.setStyle(SkPaint::kStroke_Style);
38 canvas->drawRect(r, paint);
39 }
40
mtklein72c9faa2015-01-09 10:06:39 -080041 void onDraw(SkCanvas* canvas) SK_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
79DEF_GM( return SkNEW(AlphaGradientsGM); )