blob: 0db51e8ea1be0667f34976ed84bbf889ef71ffcc [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:
17 virtual SkString onShortName() SK_OVERRIDE {
18 return SkString("alphagradients");
19 }
20
21 virtual SkISize onISize() SK_OVERRIDE {
22 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,
32 SkShader::kClamp_TileMode,
33 NULL, flags);
34 paint.setShader(s)->unref();
35 canvas->drawRect(r, paint);
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000036
reed@google.com3d3a8602013-05-24 14:58:44 +000037 paint.setShader(NULL);
38 paint.setStyle(SkPaint::kStroke_Style);
39 canvas->drawRect(r, paint);
40 }
41
42 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
43 static const struct {
44 SkColor fColor0;
45 SkColor fColor1;
46 } gRec[] = {
47 { 0xFFFFFFFF, 0x00000000 },
48 { 0xFFFFFFFF, 0x00FF0000 },
49 { 0xFFFFFFFF, 0x00FFFF00 },
50 { 0xFFFFFFFF, 0x00FFFFFF },
51 { 0xFFFF0000, 0x00000000 },
52 { 0xFFFF0000, 0x00FF0000 },
53 { 0xFFFF0000, 0x00FFFF00 },
54 { 0xFFFF0000, 0x00FFFFFF },
55 { 0xFF0000FF, 0x00000000 },
56 { 0xFF0000FF, 0x00FF0000 },
57 { 0xFF0000FF, 0x00FFFF00 },
58 { 0xFF0000FF, 0x00FFFFFF },
59 };
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000060
reed@google.com3d3a8602013-05-24 14:58:44 +000061 SkRect r = SkRect::MakeWH(300, 30);
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000062
reed@google.com3d3a8602013-05-24 14:58:44 +000063 canvas->translate(10, 10);
64
65 for (int doPreMul = 0; doPreMul <= 1; ++doPreMul) {
66 canvas->save();
67 for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
68 draw_grad(canvas, r, gRec[i].fColor0, gRec[i].fColor1, SkToBool(doPreMul));
69 canvas->translate(0, r.height() + 8);
70 }
71 canvas->restore();
72 canvas->translate(r.width() + 10, 0);
73 }
74 }
75
76 virtual uint32_t onGetFlags() const { return kSkipPipe_Flag; }
77
78private:
79 typedef skiagm::GM INHERITED;
80};
81
82DEF_GM( return SkNEW(AlphaGradientsGM); )