1
2/*
3 * Copyright 2013 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "gm.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
19static const 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//static const SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 };
31
32static const GradData gGradData[] = {
33    { 40, gColors, NULL },
34    //  { 2, gColors, gPos },
35    //  { 2, gCol2, NULL },
36};
37
38static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
39    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
40}
41
42static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
43    SkPoint center;
44    center.set(SkScalarAve(pts[0].fX, pts[1].fX),
45               SkScalarAve(pts[0].fY, pts[1].fY));
46    return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
47                                          data.fPos, data.fCount, tm);
48}
49
50static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
51    SkPoint center;
52    center.set(SkScalarAve(pts[0].fX, pts[1].fX),
53               SkScalarAve(pts[0].fY, pts[1].fY));
54    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
55}
56
57
58typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
59
60static const GradMaker gGradMakers[] = {
61    MakeLinear, MakeRadial, MakeSweep,
62};
63
64///////////////////////////////////////////////////////////////////////////////
65
66class GradientsGM : public GM {
67public:
68    GradientsGM() {
69        this->setBGColor(0xFFDDDDDD);
70    }
71
72protected:
73    virtual uint32_t onGetFlags() const SK_OVERRIDE {
74        return kSkipTiled_Flag;
75    }
76
77    SkString onShortName() SK_OVERRIDE { return SkString("gradient_dirty_laundry"); }
78    virtual SkISize onISize() SK_OVERRIDE { return SkISize::Make(640, 615); }
79
80    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
81        SkPoint pts[2] = { { 0, 0 },
82                           { SkIntToScalar(100), SkIntToScalar(100) }
83        };
84        SkShader::TileMode tm = SkShader::kClamp_TileMode;
85        SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
86        SkPaint paint;
87        paint.setAntiAlias(true);
88
89        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
90        for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
91            canvas->save();
92            for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
93                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm);
94                paint.setShader(shader)->unref();
95                canvas->drawRect(r, paint);
96                canvas->translate(0, SkIntToScalar(120));
97            }
98            canvas->restore();
99            canvas->translate(SkIntToScalar(120), 0);
100        }
101    }
102
103private:
104    typedef GM INHERITED;
105};
106
107///////////////////////////////////////////////////////////////////////////////
108
109static GM* MyFactory(void*) { return new GradientsGM; }
110static GMRegistry reg(MyFactory);
111