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1 /*
2  * Copyright 2013 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/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkPaint.h"
12 #include "include/core/SkPathBuilder.h"
13 #include "include/core/SkRRect.h"
14 #include "include/core/SkRect.h"
15 #include "include/core/SkScalar.h"
16 #include "include/core/SkSize.h"
17 #include "include/core/SkString.h"
18 #include "include/core/SkTypes.h"
19 #include "include/utils/SkRandom.h"
20 
21 namespace skiagm {
22 
23 // Test out various combinations of nested rects, ovals and rrects.
24 class NestedGM : public GM {
25 public:
NestedGM(bool doAA,bool flipped)26     NestedGM(bool doAA, bool flipped) : fDoAA(doAA), fFlipped(flipped) {
27         this->setBGColor(0xFFDDDDDD);
28     }
29 
30 protected:
31 
onShortName()32     SkString onShortName() override {
33         SkString name("nested");
34         if (fFlipped) {
35             name.append("_flipY");
36         }
37         if (fDoAA) {
38             name.append("_aa");
39         } else {
40             name.append("_bw");
41         }
42         return name;
43     }
44 
onISize()45     SkISize onISize() override {
46         return SkISize::Make(kImageWidth, kImageHeight);
47     }
48 
49     enum Shapes {
50         kRect_Shape = 0,
51         kRRect_Shape,
52         kOval_Shape,
53         kShapeCount
54     };
55 
AddShape(SkPathBuilder * b,const SkRect & rect,Shapes shape,SkPathDirection dir)56     static void AddShape(SkPathBuilder* b, const SkRect& rect, Shapes shape, SkPathDirection dir) {
57         switch (shape) {
58             case kRect_Shape:
59                 b->addRect(rect, dir);
60                 break;
61             case kRRect_Shape: {
62                 SkRRect rr;
63                 rr.setRectXY(rect, 5, 5);
64                 b->addRRect(rr, dir);
65                 break;
66                 }
67             case kOval_Shape:
68                 b->addOval(rect, dir);
69                 break;
70             default:
71                 break;
72         }
73     }
74 
onDraw(SkCanvas * canvas)75     void onDraw(SkCanvas* canvas) override {
76 
77         SkPaint shapePaint;
78         shapePaint.setColor(SK_ColorBLACK);
79         shapePaint.setAntiAlias(fDoAA);
80 
81         SkRect outerRect = SkRect::MakeWH(40, 40);
82 
83         SkRect innerRects[] = {
84             { 10, 10, 30, 30 },     // small
85             { .5f, 18, 4.5f, 22 }   // smaller and offset to left
86         };
87 
88         // draw a background pattern to make transparency errors more apparent
89         SkRandom rand;
90 
91         for (int y = 0; y < kImageHeight; y += 10) {
92             for (int x = 0; x < kImageWidth; x += 10) {
93                 SkRect r = SkRect::MakeXYWH(SkIntToScalar(x),
94                                             SkIntToScalar(y),
95                                             10, 10);
96                 SkPaint p;
97                 p.setColor(rand.nextU() | 0xFF000000);
98                 canvas->drawRect(r, p);
99             }
100         }
101 
102         SkScalar xOff = 2, yOff = 2;
103         for (int outerShape = 0; outerShape < kShapeCount; ++outerShape) {
104             for (int innerShape = 0; innerShape < kShapeCount; ++innerShape) {
105                 for (size_t innerRect = 0; innerRect < SK_ARRAY_COUNT(innerRects); ++innerRect) {
106                     SkPathBuilder builder;
107 
108                     AddShape(&builder, outerRect, (Shapes) outerShape, SkPathDirection::kCW);
109                     AddShape(&builder, innerRects[innerRect], (Shapes) innerShape,
110                              SkPathDirection::kCCW);
111 
112                     canvas->save();
113                     if (fFlipped) {
114                         canvas->scale(1.0f, -1.0f);
115                         canvas->translate(xOff, -yOff - 40.0f);
116                     } else {
117                         canvas->translate(xOff, yOff);
118                     }
119 
120                     canvas->drawPath(builder.detach(), shapePaint);
121                     canvas->restore();
122 
123                     xOff += 45;
124                 }
125             }
126 
127             xOff = 2;
128             yOff += 45;
129         }
130 
131     }
132 
133 private:
134     inline static constexpr int kImageWidth = 269;
135     inline static constexpr int kImageHeight = 134;
136 
137     bool fDoAA;
138     bool fFlipped;
139 
140     using INHERITED = GM;
141 };
142 
143 ///////////////////////////////////////////////////////////////////////////////
144 
145 DEF_GM( return new NestedGM(/* doAA = */ true,  /* flipped = */ false); )
DEF_GM(return new NestedGM (false,false);)146 DEF_GM( return new NestedGM(/* doAA = */ false, /* flipped = */ false); )
147 DEF_GM( return new NestedGM(/* doAA = */ true,  /* flipped = */ true); )
148 DEF_GM( return new NestedGM(/* doAA = */ false, /* flipped = */ true); )
149 
150 DEF_SIMPLE_GM(nested_hairline_square, canvas, 64, 64) {
151     // See crbug.com/1234194 - This should draw 1 row of 3 stroked squares, with a second 0.5px
152     // shifted row of squares below it.
__anon7641eed20102() 153     auto drawEllipses = [&]() {
154         canvas->save();
155         // Originally the SVG string "M5,14H0V9h5V14Z M1,13h3v-3H1V13Z" but that just specifies a
156         // 5px wide square outside a 3px wide square.
157         SkPath square;
158         square.addRect(SkRect::MakeLTRB(0.f, 9.f, 5.f, 14.f));
159         square.addRect(SkRect::MakeLTRB(1.f, 10.f, 4.f, 13.f), SkPathDirection::kCCW);
160 
161         // From the bug, SVG viewbox was (0, 0, 24, 24), so the above coordinates are relative to
162         // that, but the svg was then the child of a div that was 16x16, so it's scaled down. This
163         // converts the 1px wide nested rects into subpixel nested rects.
164         canvas->scale(16.f / 24.f, 16.f / 24.f);
165 
166         SkPaint paint;
167         paint.setColor(SkColorSetARGB(255, 70, 70, 70));
168         paint.setAntiAlias(true);
169 
170         // The original SVG drew 3 separate paths, but these were just translations of the original
171         // path baked into a path string.
172         canvas->drawPath(square, paint);
173         canvas->translate(10.f, 0.f);
174         canvas->drawPath(square, paint);
175         canvas->translate(10.f, 0.f);
176         canvas->drawPath(square, paint);
177 
178         canvas->restore();
179     };
180 
181     drawEllipses();
182     canvas->translate(0.5f, 16.f);
183     drawEllipses();
184 }
185 
186 }  // namespace skiagm
187