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    SkString onShortName() SK_OVERRIDE { return SkString("gradient_dirty_laundry"); }
74    virtual SkISize onISize() SK_OVERRIDE { return SkISize::Make(640, 615); }
75
76    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
77        SkPoint pts[2] = { { 0, 0 },
78                           { SkIntToScalar(100), SkIntToScalar(100) }
79        };
80        SkShader::TileMode tm = SkShader::kClamp_TileMode;
81        SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
82        SkPaint paint;
83        paint.setAntiAlias(true);
84
85        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
86        for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
87            canvas->save();
88            for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
89                SkShader* shader = gGradMakers[j](pts, gGradData[i], tm);
90                paint.setShader(shader)->unref();
91                canvas->drawRect(r, paint);
92                canvas->translate(0, SkIntToScalar(120));
93            }
94            canvas->restore();
95            canvas->translate(SkIntToScalar(120), 0);
96        }
97    }
98
99private:
100    typedef GM INHERITED;
101};
102
103///////////////////////////////////////////////////////////////////////////////
104
105static GM* MyFactory(void*) { return new GradientsGM; }
106static GMRegistry reg(MyFactory);
107