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 "SkMorphologyImageFilter.h"
16#include "SkOffsetImageFilter.h"
17#include "SkPerlinNoiseShader.h"
18#include "SkRectShaderImageFilter.h"
19#include "SkMatrixImageFilter.h"
20#include "SkScalar.h"
21
22#define RESIZE_FACTOR_X SkIntToScalar(2)
23#define RESIZE_FACTOR_Y SkIntToScalar(5)
24
25namespace skiagm {
26
27class ImageFiltersClippedGM : public GM {
28public:
29    ImageFiltersClippedGM() : 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("imagefiltersclipped");
40    }
41
42    virtual SkISize onISize() {
43        return SkISize::Make(860, 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 = SkMinScalar(x, y) * 0.8f;
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        SkMatrix resizeMatrix;
99        resizeMatrix.setScale(RESIZE_FACTOR_X, RESIZE_FACTOR_Y);
100
101        SkImageFilter* filters[] = {
102            SkBlurImageFilter::Create(SkIntToScalar(12), SkIntToScalar(12)),
103            SkDropShadowImageFilter::Create(SkIntToScalar(10), SkIntToScalar(10), SkIntToScalar(3),
104                                            SK_ColorGREEN),
105            SkDisplacementMapEffect::Create(SkDisplacementMapEffect::kR_ChannelSelectorType,
106                                            SkDisplacementMapEffect::kR_ChannelSelectorType,
107                                            SkIntToScalar(12),
108                                            gradient.get(),
109                                            checkerboard.get()),
110            SkDilateImageFilter::Create(2, 2, checkerboard.get()),
111            SkErodeImageFilter::Create(2, 2, checkerboard.get()),
112            SkOffsetImageFilter::Create(SkIntToScalar(-16), SkIntToScalar(32)),
113            SkMatrixImageFilter::Create(resizeMatrix, SkPaint::kNone_FilterLevel),
114            SkRectShaderImageFilter::Create(noise),
115        };
116
117        SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
118        SkScalar margin = SkIntToScalar(16);
119        SkRect bounds = r;
120        bounds.outset(margin, margin);
121
122        for (int xOffset = 0; xOffset < 80; xOffset += 16) {
123            canvas->save();
124            bounds.fLeft = SkIntToScalar(xOffset);
125            for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
126                SkPaint paint;
127                paint.setColor(SK_ColorWHITE);
128                paint.setImageFilter(filters[i]);
129                paint.setAntiAlias(true);
130                canvas->save();
131                canvas->clipRect(bounds);
132                if (5 == i) {
133                    canvas->translate(SkIntToScalar(16), SkIntToScalar(-32));
134                } else if (6 == i) {
135                    canvas->scale(SkScalarInvert(RESIZE_FACTOR_X),
136                                  SkScalarInvert(RESIZE_FACTOR_Y));
137                }
138                canvas->drawCircle(r.centerX(), r.centerY(),
139                                   SkScalarDiv(r.width()*2, SkIntToScalar(5)), paint);
140                canvas->restore();
141                canvas->translate(r.width() + margin, 0);
142            }
143            canvas->restore();
144            canvas->translate(0, r.height() + margin);
145        }
146
147        for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
148            SkSafeUnref(filters[i]);
149        }
150    }
151
152private:
153    bool fInitialized;
154    SkBitmap fCheckerboard;
155    SkBitmap fGradientCircle;
156    typedef GM INHERITED;
157};
158
159//////////////////////////////////////////////////////////////////////////////
160
161static GM* MyFactory(void*) { return new ImageFiltersClippedGM; }
162static GMRegistry reg(MyFactory);
163
164}
165