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), SkIntToScalar(3),
113                                            SK_ColorYELLOW),
114            SkDisplacementMapEffect::Create(SkDisplacementMapEffect::kR_ChannelSelectorType,
115                                            SkDisplacementMapEffect::kR_ChannelSelectorType,
116                                            SkIntToScalar(12),
117                                            gradient.get(),
118                                            checkerboard.get()),
119            SkDilateImageFilter::Create(1, 1, checkerboard.get()),
120            SkErodeImageFilter::Create(1, 1, checkerboard.get()),
121            SkOffsetImageFilter::Create(SkIntToScalar(32), 0),
122            SkMatrixImageFilter::Create(resizeMatrix, SkPaint::kNone_FilterLevel),
123            SkRectShaderImageFilter::Create(noise),
124            SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd),
125            SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent,
126                                                        cutoffAngle, white, surfaceScale, kd),
127        };
128
129        SkVector scales[] = {
130            SkVector::Make(SkScalarInvert(2), SkScalarInvert(2)),
131            SkVector::Make(SkIntToScalar(1), SkIntToScalar(1)),
132            SkVector::Make(SkIntToScalar(1), SkIntToScalar(2)),
133            SkVector::Make(SkIntToScalar(2), SkIntToScalar(1)),
134            SkVector::Make(SkIntToScalar(2), SkIntToScalar(2)),
135        };
136
137        SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
138        SkScalar margin = SkIntToScalar(16);
139        SkRect bounds = r;
140        bounds.outset(margin, margin);
141
142        for (size_t j = 0; j < SK_ARRAY_COUNT(scales); ++j) {
143            canvas->save();
144            for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
145                SkPaint paint;
146                paint.setColor(SK_ColorBLUE);
147                paint.setImageFilter(filters[i]);
148                paint.setAntiAlias(true);
149                canvas->save();
150                canvas->scale(scales[j].fX, scales[j].fY);
151                if (5 == i) {
152                    canvas->translate(SkIntToScalar(-32), 0);
153                } else if (6 == i) {
154                    canvas->scale(SkScalarInvert(RESIZE_FACTOR),
155                                  SkScalarInvert(RESIZE_FACTOR));
156                }
157                canvas->drawCircle(r.centerX(), r.centerY(),
158                                   SkScalarDiv(r.width()*2, SkIntToScalar(5)), paint);
159                canvas->restore();
160                canvas->translate(r.width() * scales[j].fX + margin, 0);
161            }
162            canvas->restore();
163            canvas->translate(0, r.height() * scales[j].fY + margin);
164        }
165
166        for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
167            filters[i]->unref();
168        }
169    }
170
171private:
172    bool fInitialized;
173    SkBitmap fCheckerboard;
174    SkBitmap fGradientCircle;
175    typedef GM INHERITED;
176};
177
178//////////////////////////////////////////////////////////////////////////////
179
180static GM* MyFactory(void*) { return new ImageFiltersScaledGM; }
181static GMRegistry reg(MyFactory);
182
183}
184