1 /*
2 * Copyright 2015 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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkBlendMode.h"
11 #include "include/core/SkCanvas.h"
12 #include "include/core/SkColor.h"
13 #include "include/core/SkImage.h"
14 #include "include/core/SkImageFilter.h"
15 #include "include/core/SkPaint.h"
16 #include "include/core/SkPoint.h"
17 #include "include/core/SkRect.h"
18 #include "include/core/SkRefCnt.h"
19 #include "include/core/SkScalar.h"
20 #include "include/core/SkShader.h"
21 #include "include/core/SkSize.h"
22 #include "include/core/SkString.h"
23 #include "include/core/SkSurface.h"
24 #include "include/core/SkTileMode.h"
25 #include "include/core/SkTypes.h"
26 #include "include/effects/SkGradientShader.h"
27 #include "include/effects/SkImageFilters.h"
28 #include "tools/Resources.h"
29 #include "tools/ToolUtils.h"
30 #include "tools/timer/TimeUtils.h"
31
32 #include <utility>
33
34 namespace skiagm {
35
36 // This GM draws image filters with a CTM containing shearing / rotation.
37 // It checks that the scale portion of the CTM is correctly extracted
38 // and applied to the image inputs separately from the non-scale portion.
39
make_gradient_circle(int width,int height)40 static sk_sp<SkImage> make_gradient_circle(int width, int height) {
41 SkScalar x = SkIntToScalar(width / 2);
42 SkScalar y = SkIntToScalar(height / 2);
43 SkScalar radius = std::min(x, y) * 0.8f;
44
45 auto surface(SkSurface::MakeRasterN32Premul(width, height));
46 SkCanvas* canvas = surface->getCanvas();
47
48 canvas->clear(0x00000000);
49 SkColor colors[2];
50 colors[0] = SK_ColorWHITE;
51 colors[1] = SK_ColorBLACK;
52 SkPaint paint;
53 paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr, 2,
54 SkTileMode::kClamp));
55 canvas->drawCircle(x, y, radius, paint);
56
57 return surface->makeImageSnapshot();
58 }
59
60 class ImageFiltersTransformedGM : public GM {
61 public:
ImageFiltersTransformedGM()62 ImageFiltersTransformedGM() {
63 this->setBGColor(SK_ColorBLACK);
64 }
65
66 protected:
67
onShortName()68 SkString onShortName() override { return SkString("imagefilterstransformed"); }
69
onISize()70 SkISize onISize() override { return SkISize::Make(420, 240); }
71
onOnceBeforeDraw()72 void onOnceBeforeDraw() override {
73 fCheckerboard = SkImage::MakeFromBitmap(
74 ToolUtils::create_checkerboard_bitmap(64, 64, 0xFFA0A0A0, 0xFF404040, 8));
75 fGradientCircle = make_gradient_circle(64, 64);
76 }
77
onDraw(SkCanvas * canvas)78 void onDraw(SkCanvas* canvas) override {
79 sk_sp<SkImageFilter> gradient(SkImageFilters::Image(fGradientCircle));
80 sk_sp<SkImageFilter> checkerboard(SkImageFilters::Image(fCheckerboard));
81 sk_sp<SkImageFilter> filters[] = {
82 SkImageFilters::Blur(12, 0, nullptr),
83 SkImageFilters::DropShadow(0, 15, 8, 0, SK_ColorGREEN, nullptr),
84 SkImageFilters::DisplacementMap(SkColorChannel::kR, SkColorChannel::kR, 12,
85 std::move(gradient), checkerboard),
86 SkImageFilters::Dilate(2, 2, checkerboard),
87 SkImageFilters::Erode(2, 2, checkerboard),
88 };
89
90 const SkScalar margin = SkIntToScalar(20);
91 const SkScalar size = SkIntToScalar(60);
92
93 for (size_t j = 0; j < 3; j++) {
94 canvas->save();
95 canvas->translate(margin, 0);
96 for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
97 SkPaint paint;
98 paint.setColor(SK_ColorWHITE);
99 paint.setImageFilter(filters[i]);
100 paint.setAntiAlias(true);
101 canvas->save();
102 canvas->translate(size * SK_ScalarHalf, size * SK_ScalarHalf);
103 canvas->scale(SkDoubleToScalar(0.8), SkDoubleToScalar(0.8));
104 if (j == 1) {
105 canvas->rotate(SkIntToScalar(45));
106 } else if (j == 2) {
107 canvas->skew(SkDoubleToScalar(0.5), SkDoubleToScalar(0.2));
108 }
109 canvas->translate(-size * SK_ScalarHalf, -size * SK_ScalarHalf);
110 canvas->drawOval(SkRect::MakeXYWH(0, size * SkDoubleToScalar(0.1),
111 size, size * SkDoubleToScalar(0.6)), paint);
112 canvas->restore();
113 canvas->translate(size + margin, 0);
114 }
115 canvas->restore();
116 canvas->translate(0, size + margin);
117 }
118 }
119
120 private:
121 sk_sp<SkImage> fCheckerboard;
122 sk_sp<SkImage> fGradientCircle;
123 using INHERITED = GM;
124 };
125 DEF_GM( return new ImageFiltersTransformedGM; )
126 } // namespace skiagm
127
128 //////////////////////////////////////////////////////////////////////////////
129
130 DEF_SIMPLE_GM(rotate_imagefilter, canvas, 500, 500) {
131 SkPaint paint;
132
133 const SkRect r = SkRect::MakeXYWH(50, 50, 100, 100);
134
135 sk_sp<SkImageFilter> filters[] = {
136 nullptr,
137 SkImageFilters::Blur(6, 0, nullptr),
138 SkImageFilters::Blend(SkBlendMode::kSrcOver, nullptr),
139 };
140
141 for (auto& filter : filters) {
142 paint.setAntiAlias(false);
143 paint.setImageFilter(filter);
144
145 canvas->save();
146
147 canvas->drawRect(r, paint);
148
149 canvas->translate(150, 0);
150 canvas->save();
151 canvas->rotate(30, 100, 100);
152 canvas->drawRect(r, paint);
153 canvas->restore();
154
155 paint.setAntiAlias(true);
156 canvas->translate(150, 0);
157 canvas->save();
158 canvas->rotate(30, 100, 100);
159 canvas->drawRect(r, paint);
160 canvas->restore();
161
162 canvas->restore();
163 canvas->translate(0, 150);
164 }
165 }
166
167 class ImageFilterMatrixWLocalMatrix : public skiagm::GM {
168 public:
169
170 // Start at 132 degrees, since that resulted in a skipped draw before the fix to
171 // SkLocalMatrixImageFilter's computeFastBounds() function.
ImageFilterMatrixWLocalMatrix()172 ImageFilterMatrixWLocalMatrix() : fDegrees(132.f) {}
173
174 protected:
onShortName()175 SkString onShortName() override {
176 return SkString("imagefilter_matrix_localmatrix");
177 }
178
onISize()179 SkISize onISize() override {
180 return SkISize::Make(512, 512);
181 }
182
onAnimate(double nanos)183 bool onAnimate(double nanos) override {
184 // Animate the rotation angle to ensure the local matrix bounds modifications work
185 // for a variety of transformations.
186 fDegrees = TimeUtils::Scaled(1e-9f * nanos, 360.f);
187 return true;
188 }
189
onOnceBeforeDraw()190 void onOnceBeforeDraw() override {
191 fImage = GetResourceAsImage("images/mandrill_256.png");
192 }
193
onDraw(SkCanvas * canvas)194 void onDraw(SkCanvas* canvas) override {
195 SkMatrix localMatrix;
196 localMatrix.preTranslate(128, 128);
197 localMatrix.preScale(2.0f, 2.0f);
198
199 // This matrix applies a rotate around the center of the image (prior to the simulated
200 // hi-dpi 2x device scale).
201 SkMatrix filterMatrix;
202 filterMatrix.setRotate(fDegrees, 64, 64);
203
204 sk_sp<SkImageFilter> filter =
205 SkImageFilter::MakeMatrixFilter(filterMatrix, kLow_SkFilterQuality, nullptr)
206 ->makeWithLocalMatrix(localMatrix);
207
208 SkPaint p;
209 p.setImageFilter(filter);
210 canvas->drawImage(fImage.get(), 128, 128, &p);
211 }
212
213 private:
214 SkScalar fDegrees;
215 sk_sp<SkImage> fImage;
216 };
217
218 DEF_GM(return new ImageFilterMatrixWLocalMatrix();)
219