1/*
2 * Copyright 2012 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 "SkGradientShader.h"
9
10namespace skiagm {
11
12static SkShader* MakeLinear(SkScalar width, SkScalar height, bool alternate) {
13  SkPoint pts[2] = { {0, 0}, {width, height}};
14  SkColor colors[2] = {SK_ColorRED, SK_ColorGREEN};
15  if (alternate) {
16    pts[1].fY = 0;
17    colors[0] = SK_ColorBLUE;
18    colors[1] = SK_ColorYELLOW;
19  }
20  return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
21                                        SkShader::kClamp_TileMode, NULL);
22}
23
24///////////////////////////////////////////////////////////////////////////////
25
26class ShaderBoundsGM : public GM {
27public:
28    typedef SkShader* (*ShaderGenFunc)(SkScalar width, SkScalar height,
29                                       bool alternate);
30    ShaderBoundsGM(ShaderGenFunc maker, const SkString& name)
31        : fShaderMaker(maker),
32          fName(name) {
33    }
34
35protected:
36    SkString onShortName() {
37        return fName;
38    }
39
40    virtual SkISize onISize() { return make_isize(320, 240); }
41
42    virtual SkMatrix onGetInitialTransform() const SK_OVERRIDE {
43        SkMatrix result;
44        SkScalar scale = SkFloatToScalar(0.8f);
45        result.setScale(scale, scale);
46        result.postTranslate(SkIntToScalar(7), SkIntToScalar(23));
47        return result;
48    }
49
50    virtual void onDraw(SkCanvas* canvas) {
51        // The PDF device has already clipped to the content area, but we
52        // do it again here so that the raster and pdf results are consistent.
53        canvas->clipRect(SkRect::MakeWH(SkIntToScalar(320),
54                                        SkIntToScalar(240)));
55
56        SkMatrix canvasScale;
57        SkScalar scale = SkFloatToScalar(0.7f);
58        canvasScale.setScale(scale, scale);
59        canvas->concat(canvasScale);
60
61        // Background shader.
62        SkPaint paint;
63        paint.setShader(MakeShader(559, 387, false))->unref();
64        SkRect r = SkRect::MakeXYWH(SkIntToScalar(-12), SkIntToScalar(-41),
65                                    SkIntToScalar(571), SkIntToScalar(428));
66        canvas->drawRect(r, paint);
67
68        // Constrained shader.
69        paint.setShader(MakeShader(101, 151, true))->unref();
70        r = SkRect::MakeXYWH(SkIntToScalar(43), SkIntToScalar(71),
71                             SkIntToScalar(101), SkIntToScalar(151));
72        canvas->clipRect(r);
73        canvas->drawRect(r, paint);
74    }
75
76    SkShader* MakeShader(int width, int height, bool background) {
77        SkScalar scale = SkFloatToScalar(0.5f);
78        if (background) {
79            scale = SkFloatToScalar(0.6f);
80        }
81        SkScalar shaderWidth = SkScalarDiv(SkIntToScalar(width), scale);
82        SkScalar shaderHeight = SkScalarDiv(SkIntToScalar(height), scale);
83        SkShader* shader = fShaderMaker(shaderWidth, shaderHeight, background);
84        SkMatrix shaderScale;
85        shaderScale.setScale(scale, scale);
86        shader->setLocalMatrix(shaderScale);
87        return shader;
88    }
89
90private:
91    typedef GM INHERITED;
92
93    ShaderGenFunc fShaderMaker;
94    SkString fName;
95
96    SkShader* MakeShader(bool background);
97};
98
99///////////////////////////////////////////////////////////////////////////////
100
101static GM* MyFactory(void*) {
102    return new ShaderBoundsGM(MakeLinear, SkString("shaderbounds_linear"));
103}
104static GMRegistry reg(MyFactory);
105
106}
107