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
8#include "gm/gm.h"
9#include "include/core/SkCanvas.h"
10#include "include/core/SkColor.h"
11#include "include/core/SkPaint.h"
12#include "include/core/SkPoint.h"
13#include "include/core/SkRect.h"
14#include "include/core/SkRefCnt.h"
15#include "include/core/SkScalar.h"
16#include "include/core/SkShader.h"
17#include "include/core/SkSize.h"
18#include "include/core/SkString.h"
19#include "include/core/SkTileMode.h"
20#include "include/core/SkTypes.h"
21#include "include/effects/SkGradientShader.h"
22
23using namespace skiagm;
24
25struct GradData {
26    int             fCount;
27    const SkColor*  fColors;
28    const SkScalar* fPos;
29};
30
31constexpr SkColor gColors[] = {
32    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
33    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
34    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
35    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
36    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
37    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
38    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
39    SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
40};
41
42//constexpr SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 };
43
44constexpr GradData gGradData[] = {
45    { 40, gColors, nullptr },
46    //  { 2, gColors, gPos },
47    //  { 2, gCol2, nullptr },
48};
49
50static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
51    return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
52}
53
54static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
55    const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
56    return SkGradientShader::MakeRadial(pt, pt.fX, data.fColors, data.fPos, data.fCount, tm);
57}
58
59static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkTileMode) {
60    const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
61    return SkGradientShader::MakeSweep(pt.fX, pt.fY, data.fColors, data.fPos, data.fCount);
62}
63
64
65typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkTileMode);
66
67constexpr GradMaker gGradMakers[] = {
68    MakeLinear, MakeRadial, MakeSweep,
69};
70
71///////////////////////////////////////////////////////////////////////////////
72
73class GradientsGM : public GM {
74public:
75    GradientsGM() {
76        this->setBGColor(0xFFDDDDDD);
77    }
78
79protected:
80    SkString onShortName() override { return SkString("gradient_dirty_laundry"); }
81    SkISize onISize() override { return SkISize::Make(640, 615); }
82
83    void onDraw(SkCanvas* canvas) override {
84        SkPoint pts[2] = { { 0, 0 },
85                           { SkIntToScalar(100), SkIntToScalar(100) }
86        };
87        SkTileMode tm = SkTileMode::kClamp;
88        SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
89        SkPaint paint;
90        paint.setAntiAlias(true);
91
92        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
93        for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
94            canvas->save();
95            for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
96                paint.setShader(gGradMakers[j](pts, gGradData[i], tm));
97                canvas->drawRect(r, paint);
98                canvas->translate(0, SkIntToScalar(120));
99            }
100            canvas->restore();
101            canvas->translate(SkIntToScalar(120), 0);
102        }
103    }
104
105private:
106    using INHERITED = GM;
107};
108
109///////////////////////////////////////////////////////////////////////////////
110
111DEF_GM( return new GradientsGM; )
112