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 
29 static 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 
46 static 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 
64 namespace skiagm {
65 
66 class ImageFiltersClippedGM : public GM {
67 public:
68     ImageFiltersClippedGM() {
69         this->setBGColor(0x00000000);
70     }
71 
72 protected:
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 
147 private:
148     sk_sp<SkImage> fCheckerboard, fGradientCircle;
149 
150     typedef GM INHERITED;
151 };
152 
153 //////////////////////////////////////////////////////////////////////////////
154 
155 DEF_GM(return new ImageFiltersClippedGM;)
156 }
157