1 /*
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 #include "gm.h"
8 #include "sk_tool_utils.h"
9 #include "SkGradientShader.h"
10
11 using namespace skiagm;
12
13 struct GradData {
14 int fCount;
15 const SkColor* fColors;
16 const SkScalar* fPos;
17 };
18
19 constexpr SkColor gColors[] = {
20 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
21 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
22 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
23 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
24 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
25 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
26 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
27 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
28 };
29
30 //constexpr SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 };
31
32 constexpr GradData gGradData[] = {
33 { 40, gColors, nullptr },
34 // { 2, gColors, gPos },
35 // { 2, gCol2, nullptr },
36 };
37
MakeLinear(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)38 static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
39 return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
40 }
41
MakeRadial(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)42 static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
43 const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
44 return SkGradientShader::MakeRadial(pt, pt.fX, data.fColors, data.fPos, data.fCount, tm);
45 }
46
MakeSweep(const SkPoint pts[2],const GradData & data,SkShader::TileMode)47 static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
48 const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
49 return SkGradientShader::MakeSweep(pt.fX, pt.fY, data.fColors, data.fPos, data.fCount);
50 }
51
52
53 typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkShader::TileMode);
54
55 constexpr GradMaker gGradMakers[] = {
56 MakeLinear, MakeRadial, MakeSweep,
57 };
58
59 ///////////////////////////////////////////////////////////////////////////////
60
61 class GradientsGM : public GM {
62 public:
GradientsGM()63 GradientsGM() {
64 this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
65 }
66
67 protected:
onShortName()68 SkString onShortName() override { return SkString("gradient_dirty_laundry"); }
onISize()69 SkISize onISize() override { return SkISize::Make(640, 615); }
70
onDraw(SkCanvas * canvas)71 void onDraw(SkCanvas* canvas) override {
72 SkPoint pts[2] = { { 0, 0 },
73 { SkIntToScalar(100), SkIntToScalar(100) }
74 };
75 SkShader::TileMode tm = SkShader::kClamp_TileMode;
76 SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
77 SkPaint paint;
78 paint.setAntiAlias(true);
79
80 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
81 for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
82 canvas->save();
83 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
84 paint.setShader(gGradMakers[j](pts, gGradData[i], tm));
85 canvas->drawRect(r, paint);
86 canvas->translate(0, SkIntToScalar(120));
87 }
88 canvas->restore();
89 canvas->translate(SkIntToScalar(120), 0);
90 }
91 }
92
93 private:
94 typedef GM INHERITED;
95 };
96
97 ///////////////////////////////////////////////////////////////////////////////
98
MyFactory(void *)99 static GM* MyFactory(void*) { return new GradientsGM; }
100 static GMRegistry reg(MyFactory);
101