1/*
2 * Copyright 2014 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 "SkColor.h"
10#include "SkBitmapSource.h"
11#include "SkBlurImageFilter.h"
12#include "SkDisplacementMapEffect.h"
13#include "SkDropShadowImageFilter.h"
14#include "SkGradientShader.h"
15#include "SkLightingImageFilter.h"
16#include "SkMorphologyImageFilter.h"
17#include "SkOffsetImageFilter.h"
18#include "SkPerlinNoiseShader.h"
19#include "SkRectShaderImageFilter.h"
20#include "SkMatrixImageFilter.h"
21#include "SkScalar.h"
22
23#define RESIZE_FACTOR SkIntToScalar(4)
24
25namespace skiagm {
26
27class ImageFiltersScaledGM : public GM {
28public:
29    ImageFiltersScaledGM() : fInitialized(false) {
30        this->setBGColor(0x00000000);
31    }
32
33protected:
34    virtual uint32_t onGetFlags() const SK_OVERRIDE {
35        return kSkipTiled_Flag;
36    }
37
38    virtual SkString onShortName() {
39        return SkString("imagefiltersscaled");
40    }
41
42    virtual SkISize onISize() {
43        return SkISize::Make(1428, 500);
44    }
45
46    void make_checkerboard() {
47        fCheckerboard.allocN32Pixels(64, 64);
48        SkCanvas canvas(fCheckerboard);
49        canvas.clear(0x00000000);
50        SkPaint darkPaint;
51        darkPaint.setColor(0xFF404040);
52        SkPaint lightPaint;
53        lightPaint.setColor(0xFFA0A0A0);
54        for (int y = 0; y < 64; y += 16) {
55          for (int x = 0; x < 64; x += 16) {
56            canvas.save();
57            canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
58            canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
59            canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
60            canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
61            canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
62            canvas.restore();
63          }
64        }
65    }
66
67    void make_gradient_circle(int width, int height) {
68        SkScalar x = SkIntToScalar(width / 2);
69        SkScalar y = SkIntToScalar(height / 2);
70        SkScalar radius = SkScalarMul(SkMinScalar(x, y), SkIntToScalar(4) / SkIntToScalar(5));
71        fGradientCircle.allocN32Pixels(width, height);
72        SkCanvas canvas(fGradientCircle);
73        canvas.clear(0x00000000);
74        SkColor colors[2];
75        colors[0] = SK_ColorWHITE;
76        colors[1] = SK_ColorBLACK;
77        SkAutoTUnref<SkShader> shader(
78            SkGradientShader::CreateRadial(SkPoint::Make(x, y), radius, colors, NULL, 2,
79                                           SkShader::kClamp_TileMode)
80        );
81        SkPaint paint;
82        paint.setShader(shader);
83        canvas.drawCircle(x, y, radius, paint);
84    }
85
86    virtual void onDraw(SkCanvas* canvas) {
87        if (!fInitialized) {
88            this->make_checkerboard();
89            this->make_gradient_circle(64, 64);
90            fInitialized = true;
91        }
92        canvas->clear(0x00000000);
93
94        SkAutoTUnref<SkImageFilter> gradient(SkBitmapSource::Create(fGradientCircle));
95        SkAutoTUnref<SkImageFilter> checkerboard(SkBitmapSource::Create(fCheckerboard));
96        SkAutoTUnref<SkShader> noise(SkPerlinNoiseShader::CreateFractalNoise(
97            SkDoubleToScalar(0.1), SkDoubleToScalar(0.05), 1, 0));
98
99        SkPoint3 pointLocation(0, 0, SkIntToScalar(10));
100        SkPoint3 spotLocation(SkIntToScalar(-10), SkIntToScalar(-10), SkIntToScalar(20));
101        SkPoint3 spotTarget(SkIntToScalar(40), SkIntToScalar(40), 0);
102        SkScalar spotExponent = SK_Scalar1;
103        SkScalar cutoffAngle = SkIntToScalar(15);
104        SkScalar kd = SkIntToScalar(2);
105        SkScalar surfaceScale = SkIntToScalar(1);
106        SkColor white(0xFFFFFFFF);
107        SkMatrix resizeMatrix;
108        resizeMatrix.setScale(RESIZE_FACTOR, RESIZE_FACTOR);
109
110        SkImageFilter* filters[] = {
111            SkBlurImageFilter::Create(SkIntToScalar(4), SkIntToScalar(4)),
112            SkDropShadowImageFilter::Create(SkIntToScalar(5), SkIntToScalar(10),
113                                            SkIntToScalar(3), SkIntToScalar(3),
114                                            SK_ColorYELLOW),
115            SkDisplacementMapEffect::Create(SkDisplacementMapEffect::kR_ChannelSelectorType,
116                                            SkDisplacementMapEffect::kR_ChannelSelectorType,
117                                            SkIntToScalar(12),
118                                            gradient.get(),
119                                            checkerboard.get()),
120            SkDilateImageFilter::Create(1, 1, checkerboard.get()),
121            SkErodeImageFilter::Create(1, 1, checkerboard.get()),
122            SkOffsetImageFilter::Create(SkIntToScalar(32), 0),
123            SkMatrixImageFilter::Create(resizeMatrix, SkPaint::kNone_FilterLevel),
124            SkRectShaderImageFilter::Create(noise),
125            SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd),
126            SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent,
127                                                        cutoffAngle, white, surfaceScale, kd),
128        };
129
130        SkVector scales[] = {
131            SkVector::Make(SkScalarInvert(2), SkScalarInvert(2)),
132            SkVector::Make(SkIntToScalar(1), SkIntToScalar(1)),
133            SkVector::Make(SkIntToScalar(1), SkIntToScalar(2)),
134            SkVector::Make(SkIntToScalar(2), SkIntToScalar(1)),
135            SkVector::Make(SkIntToScalar(2), SkIntToScalar(2)),
136        };
137
138        SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
139        SkScalar margin = SkIntToScalar(16);
140        SkRect bounds = r;
141        bounds.outset(margin, margin);
142
143        for (size_t j = 0; j < SK_ARRAY_COUNT(scales); ++j) {
144            canvas->save();
145            for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
146                SkPaint paint;
147                paint.setColor(SK_ColorBLUE);
148                paint.setImageFilter(filters[i]);
149                paint.setAntiAlias(true);
150                canvas->save();
151                canvas->scale(scales[j].fX, scales[j].fY);
152                if (5 == i) {
153                    canvas->translate(SkIntToScalar(-32), 0);
154                } else if (6 == i) {
155                    canvas->scale(SkScalarInvert(RESIZE_FACTOR),
156                                  SkScalarInvert(RESIZE_FACTOR));
157                }
158                canvas->drawCircle(r.centerX(), r.centerY(),
159                                   SkScalarDiv(r.width()*2, SkIntToScalar(5)), paint);
160                canvas->restore();
161                canvas->translate(r.width() * scales[j].fX + margin, 0);
162            }
163            canvas->restore();
164            canvas->translate(0, r.height() * scales[j].fY + margin);
165        }
166
167        for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
168            filters[i]->unref();
169        }
170    }
171
172private:
173    bool fInitialized;
174    SkBitmap fCheckerboard;
175    SkBitmap fGradientCircle;
176    typedef GM INHERITED;
177};
178
179//////////////////////////////////////////////////////////////////////////////
180
181static GM* MyFactory(void*) { return new ImageFiltersScaledGM; }
182static GMRegistry reg(MyFactory);
183
184}
185