blob: 65fa0c4082daf3df93b7e726731846558ea0bf03 [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;
reed8a21c9f2016-03-08 18:50:00 -080031 paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
32 SkShader::kClamp_TileMode, flags, nullptr));
reed@google.com3d3a8602013-05-24 14:58:44 +000033 canvas->drawRect(r, paint);
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000034
halcanary96fcdcc2015-08-27 07:41:13 -070035 paint.setShader(nullptr);
reed@google.com3d3a8602013-05-24 14:58:44 +000036 paint.setStyle(SkPaint::kStroke_Style);
37 canvas->drawRect(r, paint);
38 }
39
mtklein36352bf2015-03-25 18:17:31 -070040 void onDraw(SkCanvas* canvas) override {
reed@google.com3d3a8602013-05-24 14:58:44 +000041 static const struct {
42 SkColor fColor0;
43 SkColor fColor1;
44 } gRec[] = {
45 { 0xFFFFFFFF, 0x00000000 },
46 { 0xFFFFFFFF, 0x00FF0000 },
47 { 0xFFFFFFFF, 0x00FFFF00 },
48 { 0xFFFFFFFF, 0x00FFFFFF },
49 { 0xFFFF0000, 0x00000000 },
50 { 0xFFFF0000, 0x00FF0000 },
51 { 0xFFFF0000, 0x00FFFF00 },
52 { 0xFFFF0000, 0x00FFFFFF },
53 { 0xFF0000FF, 0x00000000 },
54 { 0xFF0000FF, 0x00FF0000 },
55 { 0xFF0000FF, 0x00FFFF00 },
56 { 0xFF0000FF, 0x00FFFFFF },
57 };
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000058
reed@google.com3d3a8602013-05-24 14:58:44 +000059 SkRect r = SkRect::MakeWH(300, 30);
skia.committer@gmail.com454ae462013-05-25 07:01:12 +000060
reed@google.com3d3a8602013-05-24 14:58:44 +000061 canvas->translate(10, 10);
62
63 for (int doPreMul = 0; doPreMul <= 1; ++doPreMul) {
64 canvas->save();
65 for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
66 draw_grad(canvas, r, gRec[i].fColor0, gRec[i].fColor1, SkToBool(doPreMul));
67 canvas->translate(0, r.height() + 8);
68 }
69 canvas->restore();
70 canvas->translate(r.width() + 10, 0);
71 }
72 }
73
reed@google.com3d3a8602013-05-24 14:58:44 +000074private:
75 typedef skiagm::GM INHERITED;
76};
77
halcanary385fe4d2015-08-26 13:07:48 -070078DEF_GM(return new AlphaGradientsGM;)