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.h"
9#include "SkGradientShader.h"
10
11typedef SkShader* (*MakeShaderProc)(const SkColor[], int count, const SkSize&);
12
13static SkShader* shader_linear(const SkColor colors[], int count, const SkSize& size) {
14    SkPoint pts[] = { { 0, 0 }, { size.width(), size.height() } };
15    return SkGradientShader::CreateLinear(pts, colors, NULL, count,
16                                          SkShader::kClamp_TileMode);
17}
18
19static SkShader* shader_radial(const SkColor colors[], int count, const SkSize& size) {
20    SkPoint center = { size.width()/2, size.height()/2 };
21    return SkGradientShader::CreateRadial(center, size.width()/2, colors, NULL, count,
22                                          SkShader::kClamp_TileMode);
23}
24
25static SkShader* shader_conical(const SkColor colors[], int count, const SkSize& size) {
26    SkPoint center = { size.width()/2, size.height()/2 };
27    return SkGradientShader::CreateTwoPointConical(center, size.width()/64,
28                                                   center, size.width()/2,
29                                                   colors, NULL, count,
30                                                   SkShader::kClamp_TileMode);
31}
32
33static SkShader* shader_sweep(const SkColor colors[], int count, const SkSize& size) {
34    return SkGradientShader::CreateSweep(size.width()/2, size.height()/2,
35                                         colors, NULL, count);
36}
37
38class ShallowGradientGM : public skiagm::GM {
39public:
40    ShallowGradientGM(MakeShaderProc proc, const char name[]) : fProc(proc) {
41        fName.printf("shallow_gradient_%s", name);
42    }
43
44protected:
45    virtual uint32_t onGetFlags() const SK_OVERRIDE {
46        if (fName.contains("linear") || fName.contains("radial")) {
47            return kSkipTiled_Flag;
48        }
49        return 0;
50    }
51
52    virtual SkString onShortName() SK_OVERRIDE {
53        return fName;
54    }
55
56    virtual SkISize onISize() SK_OVERRIDE {
57        return SkISize::Make(800, 800);
58    }
59
60    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
61        const SkColor colors[] = { 0xFF555555, 0xFF444444 };
62        const int colorCount = SK_ARRAY_COUNT(colors);
63
64        SkRect r = { 0, 0, this->width(), this->height() };
65        SkSize size = SkSize::Make(r.width(), r.height());
66
67        SkPaint paint;
68        paint.setShader(fProc(colors, colorCount, size))->unref();
69        canvas->drawRect(r, paint);
70    }
71
72private:
73    MakeShaderProc fProc;
74    SkString fName;
75
76    typedef skiagm::GM INHERITED;
77};
78
79///////////////////////////////////////////////////////////////////////////////
80
81DEF_GM( return new ShallowGradientGM(shader_linear, "linear"); )
82DEF_GM( return new ShallowGradientGM(shader_radial, "radial"); )
83DEF_GM( return new ShallowGradientGM(shader_conical, "conical"); )
84DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep"); )
85