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 "SkBlurImageFilter.h"
9#include "SkColor.h"
10#include "SkDisplacementMapEffect.h"
11#include "SkDropShadowImageFilter.h"
12#include "SkGradientShader.h"
13#include "SkImage.h"
14#include "SkImageSource.h"
15#include "SkLightingImageFilter.h"
16#include "SkMorphologyImageFilter.h"
17#include "SkOffsetImageFilter.h"
18#include "SkPaintImageFilter.h"
19#include "SkPerlinNoiseShader.h"
20#include "SkPoint3.h"
21#include "SkScalar.h"
22#include "SkSurface.h"
23#include "gm.h"
24#include "sk_tool_utils.h"
25
26#define RESIZE_FACTOR_X SkIntToScalar(2)
27#define RESIZE_FACTOR_Y SkIntToScalar(5)
28
29static sk_sp<SkImage> make_gradient_circle(int width, int height) {
30    SkScalar x = SkIntToScalar(width / 2);
31    SkScalar y = SkIntToScalar(height / 2);
32    SkScalar radius = SkMinScalar(x, y) * 0.8f;
33    auto surface(SkSurface::MakeRasterN32Premul(width, height));
34    SkCanvas* canvas = surface->getCanvas();
35    canvas->clear(0x00000000);
36    SkColor colors[2];
37    colors[0] = SK_ColorWHITE;
38    colors[1] = SK_ColorBLACK;
39    SkPaint paint;
40    paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr,
41        2, SkShader::kClamp_TileMode));
42    canvas->drawCircle(x, y, radius, paint);
43    return surface->makeImageSnapshot();
44}
45
46static void draw_clipped_filter(SkCanvas* canvas, sk_sp<SkImageFilter> filter, size_t i,
47                                const SkRect& primBounds, const SkRect& clipBounds) {
48    SkPaint paint;
49    paint.setColor(SK_ColorWHITE);
50    paint.setImageFilter(std::move(filter));
51    paint.setAntiAlias(true);
52    canvas->save();
53    canvas->clipRect(clipBounds);
54    if (5 == i) {
55        canvas->translate(SkIntToScalar(16), SkIntToScalar(-32));
56    } else if (6 == i) {
57        canvas->scale(SkScalarInvert(RESIZE_FACTOR_X), SkScalarInvert(RESIZE_FACTOR_Y));
58    }
59    canvas->drawCircle(primBounds.centerX(), primBounds.centerY(),
60                       primBounds.width() * 2 / 5, paint);
61    canvas->restore();
62}
63
64namespace skiagm {
65
66class ImageFiltersClippedGM : public GM {
67public:
68    ImageFiltersClippedGM() {
69        this->setBGColor(0x00000000);
70    }
71
72protected:
73    SkString onShortName() override {
74        return SkString("imagefiltersclipped");
75    }
76
77    SkISize onISize() override {
78        return SkISize::Make(860, 500);
79    }
80
81    void onOnceBeforeDraw() override {
82        fCheckerboard = SkImage::MakeFromBitmap
83            (sk_tool_utils::create_checkerboard_bitmap(64, 64, 0xFFA0A0A0, 0xFF404040, 8));
84        fGradientCircle = make_gradient_circle(64, 64);
85    }
86
87    void onDraw(SkCanvas* canvas) override {
88        canvas->clear(SK_ColorBLACK);
89
90        sk_sp<SkImageFilter> gradient(SkImageSource::Make(fGradientCircle));
91        sk_sp<SkImageFilter> checkerboard(SkImageSource::Make(fCheckerboard));
92        SkMatrix resizeMatrix;
93        resizeMatrix.setScale(RESIZE_FACTOR_X, RESIZE_FACTOR_Y);
94        SkPoint3 pointLocation = SkPoint3::Make(32, 32, SkIntToScalar(10));
95
96        sk_sp<SkImageFilter> filters[] = {
97            SkBlurImageFilter::Make(SkIntToScalar(12), SkIntToScalar(12), nullptr),
98            SkDropShadowImageFilter::Make(
99                                    SkIntToScalar(10), SkIntToScalar(10),
100                                    SkIntToScalar(3), SkIntToScalar(3), SK_ColorGREEN,
101                                    SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
102                                    nullptr),
103            SkDisplacementMapEffect::Make(SkDisplacementMapEffect::kR_ChannelSelectorType,
104                                          SkDisplacementMapEffect::kR_ChannelSelectorType,
105                                          SkIntToScalar(12),
106                                          std::move(gradient),
107                                          checkerboard),
108            SkDilateImageFilter::Make(2, 2, checkerboard),
109            SkErodeImageFilter::Make(2, 2, checkerboard),
110            SkOffsetImageFilter::Make(SkIntToScalar(-16), SkIntToScalar(32), nullptr),
111            SkImageFilter::MakeMatrixFilter(resizeMatrix, kNone_SkFilterQuality, nullptr),
112            SkLightingImageFilter::MakePointLitDiffuse(pointLocation, SK_ColorWHITE, SK_Scalar1,
113                                                       SkIntToScalar(2), checkerboard),
114
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        canvas->save();
123        for (int xOffset = 0; xOffset < 80; xOffset += 16) {
124            canvas->save();
125            bounds.fLeft = SkIntToScalar(xOffset);
126            for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
127                draw_clipped_filter(canvas, filters[i], i, r, bounds);
128                canvas->translate(r.width() + margin, 0);
129            }
130            canvas->restore();
131            canvas->translate(0, r.height() + margin);
132        }
133        canvas->restore();
134
135        SkPaint noisePaint;
136        noisePaint.setShader(SkPerlinNoiseShader::MakeFractalNoise(0.1f, 0.05f, 1, 0));
137
138        sk_sp<SkImageFilter> rectFilter(SkPaintImageFilter::Make(noisePaint));
139        canvas->translate(SK_ARRAY_COUNT(filters)*(r.width() + margin), 0);
140        for (int xOffset = 0; xOffset < 80; xOffset += 16) {
141            bounds.fLeft = SkIntToScalar(xOffset);
142            draw_clipped_filter(canvas, rectFilter, 0, r, bounds);
143            canvas->translate(0, r.height() + margin);
144        }
145    }
146
147private:
148    sk_sp<SkImage> fCheckerboard, fGradientCircle;
149
150    typedef GM INHERITED;
151};
152
153//////////////////////////////////////////////////////////////////////////////
154
155DEF_GM(return new ImageFiltersClippedGM;)
156}
157