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 "sk_tool_utils.h"
9 #include "SkBlurImageFilter.h"
10 #include "SkColor.h"
11 #include "SkDisplacementMapEffect.h"
12 #include "SkDropShadowImageFilter.h"
13 #include "SkGradientShader.h"
14 #include "SkImage.h"
15 #include "SkImageSource.h"
16 #include "SkMorphologyImageFilter.h"
17 #include "SkScalar.h"
18 #include "SkSurface.h"
19 #include "gm.h"
20
21 namespace skiagm {
22
23 // This GM draws image filters with a CTM containing shearing / rotation.
24 // It checks that the scale portion of the CTM is correctly extracted
25 // and applied to the image inputs separately from the non-scale portion.
26
make_gradient_circle(int width,int height)27 static SkImage* make_gradient_circle(int width, int height) {
28 SkScalar x = SkIntToScalar(width / 2);
29 SkScalar y = SkIntToScalar(height / 2);
30 SkScalar radius = SkMinScalar(x, y) * 0.8f;
31
32 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(width, height));
33 SkCanvas* canvas = surface->getCanvas();
34
35 canvas->clear(0x00000000);
36 SkColor colors[2];
37 colors[0] = SK_ColorWHITE;
38 colors[1] = SK_ColorBLACK;
39 SkAutoTUnref<SkShader> shader(
40 SkGradientShader::CreateRadial(SkPoint::Make(x, y), radius, colors, nullptr, 2,
41 SkShader::kClamp_TileMode)
42 );
43 SkPaint paint;
44 paint.setShader(shader);
45 canvas->drawCircle(x, y, radius, paint);
46
47 return surface->newImageSnapshot();
48 }
49
50 class ImageFiltersTransformedGM : public GM {
51 public:
ImageFiltersTransformedGM()52 ImageFiltersTransformedGM() {
53 this->setBGColor(SK_ColorBLACK);
54 }
55
56 protected:
57
onShortName()58 SkString onShortName() override { return SkString("imagefilterstransformed"); }
59
onISize()60 SkISize onISize() override { return SkISize::Make(420, 240); }
61
onOnceBeforeDraw()62 void onOnceBeforeDraw() override {
63 fCheckerboard.reset(SkImage::NewFromBitmap(
64 sk_tool_utils::create_checkerboard_bitmap(64, 64, 0xFFA0A0A0, 0xFF404040, 8)));
65 fGradientCircle.reset(make_gradient_circle(64, 64));
66 }
67
onDraw(SkCanvas * canvas)68 void onDraw(SkCanvas* canvas) override {
69 SkAutoTUnref<SkImageFilter> gradient(SkImageSource::Create(fGradientCircle));
70 SkAutoTUnref<SkImageFilter> checkerboard(SkImageSource::Create(fCheckerboard));
71 SkImageFilter* filters[] = {
72 SkBlurImageFilter::Create(12, 0),
73 SkDropShadowImageFilter::Create(0, 15, 8, 0, SK_ColorGREEN,
74 SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode),
75 SkDisplacementMapEffect::Create(SkDisplacementMapEffect::kR_ChannelSelectorType,
76 SkDisplacementMapEffect::kR_ChannelSelectorType,
77 12,
78 gradient.get(),
79 checkerboard.get()),
80 SkDilateImageFilter::Create(2, 2, checkerboard.get()),
81 SkErodeImageFilter::Create(2, 2, checkerboard.get()),
82 };
83
84 const SkScalar margin = SkIntToScalar(20);
85 const SkScalar size = SkIntToScalar(60);
86
87 for (size_t j = 0; j < 3; j++) {
88 canvas->save();
89 canvas->translate(margin, 0);
90 for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
91 SkPaint paint;
92 paint.setColor(SK_ColorWHITE);
93 paint.setImageFilter(filters[i]);
94 paint.setAntiAlias(true);
95 canvas->save();
96 canvas->translate(size * SK_ScalarHalf, size * SK_ScalarHalf);
97 canvas->scale(SkDoubleToScalar(0.8), SkDoubleToScalar(0.8));
98 if (j == 1) {
99 canvas->rotate(SkIntToScalar(45));
100 } else if (j == 2) {
101 canvas->skew(SkDoubleToScalar(0.5), SkDoubleToScalar(0.2));
102 }
103 canvas->translate(-size * SK_ScalarHalf, -size * SK_ScalarHalf);
104 canvas->drawOval(SkRect::MakeXYWH(0, size * SkDoubleToScalar(0.1),
105 size, size * SkDoubleToScalar(0.6)), paint);
106 canvas->restore();
107 canvas->translate(size + margin, 0);
108 }
109 canvas->restore();
110 canvas->translate(0, size + margin);
111 }
112
113 for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
114 SkSafeUnref(filters[i]);
115 }
116 }
117
118 private:
119 SkAutoTUnref<SkImage> fCheckerboard;
120 SkAutoTUnref<SkImage> fGradientCircle;
121 typedef GM INHERITED;
122 };
123
124 //////////////////////////////////////////////////////////////////////////////
125
126 DEF_GM( return new ImageFiltersTransformedGM; )
127
128 }
129