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
11using namespace skiagm;
12
13struct GradData {
14    int             fCount;
15    const SkColor*  fColors;
16    const SkScalar* fPos;
17};
18
19constexpr 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
32constexpr GradData gGradData[] = {
33    { 40, gColors, nullptr },
34    //  { 2, gColors, gPos },
35    //  { 2, gCol2, nullptr },
36};
37
38static 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
42static 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
47static 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
53typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkShader::TileMode);
54
55constexpr GradMaker gGradMakers[] = {
56    MakeLinear, MakeRadial, MakeSweep,
57};
58
59///////////////////////////////////////////////////////////////////////////////
60
61class GradientsGM : public GM {
62public:
63    GradientsGM() {
64        this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
65    }
66
67protected:
68    SkString onShortName() override { return SkString("gradient_dirty_laundry"); }
69    SkISize onISize() override { return SkISize::Make(640, 615); }
70
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
93private:
94    typedef GM INHERITED;
95};
96
97///////////////////////////////////////////////////////////////////////////////
98
99static GM* MyFactory(void*) { return new GradientsGM; }
100static GMRegistry reg(MyFactory);
101