1 /*
2 * Copyright 2012 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.h"
9 #include "SkCanvas.h"
10 #include "SkPath.h"
11
12 #define STROKE_WIDTH SkIntToScalar(20)
13
draw_path(SkCanvas * canvas,const SkPath & path,const SkRect & rect,SkPaint::Join join,int doFill)14 static void draw_path(SkCanvas* canvas, const SkPath& path, const SkRect& rect,
15 SkPaint::Join join, int doFill) {
16 SkPaint paint;
17 paint.setAntiAlias(true);
18 paint.setStyle(doFill ? SkPaint::kStrokeAndFill_Style : SkPaint::kStroke_Style);
19
20 paint.setColor(SK_ColorGRAY);
21 paint.setStrokeWidth(STROKE_WIDTH);
22 paint.setStrokeJoin(join);
23 canvas->drawRect(rect, paint);
24
25 paint.setStyle(SkPaint::kStroke_Style);
26 paint.setStrokeWidth(0);
27 paint.setColor(SK_ColorRED);
28 canvas->drawPath(path, paint);
29
30 paint.setStrokeWidth(3);
31 paint.setStrokeJoin(SkPaint::kMiter_Join);
32 int n = path.countPoints();
33 SkAutoTArray<SkPoint> points(n);
34 path.getPoints(points.get(), n);
35 canvas->drawPoints(SkCanvas::kPoints_PointMode, n, points.get(), paint);
36 }
37
38 /*
39 * Test calling SkStroker for rectangles. Cases to cover:
40 *
41 * geometry: normal, small (smaller than stroke-width), empty, inverted
42 * joint-type for the corners
43 */
44 class StrokeRectGM : public skiagm::GM {
45 public:
StrokeRectGM()46 StrokeRectGM() {}
47
48 protected:
49
onShortName()50 SkString onShortName() override {
51 return SkString("strokerect");
52 }
53
onISize()54 SkISize onISize() override {
55 return SkISize::Make(1400, 740);
56 }
57
onDraw(SkCanvas * canvas)58 void onDraw(SkCanvas* canvas) override {
59 canvas->drawColor(SK_ColorWHITE);
60 canvas->translate(STROKE_WIDTH*3/2, STROKE_WIDTH*3/2);
61
62 SkPaint paint;
63 paint.setStyle(SkPaint::kStroke_Style);
64 paint.setStrokeWidth(STROKE_WIDTH);
65
66 constexpr SkPaint::Join gJoins[] = {
67 SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
68 };
69
70 constexpr SkScalar W = 80;
71 constexpr SkScalar H = 80;
72 constexpr SkRect gRects[] = {
73 { 0, 0, W, H },
74 { W, 0, 0, H },
75 { 0, H, W, 0 },
76 { 0, 0, STROKE_WIDTH, H },
77 { 0, 0, W, STROKE_WIDTH },
78 { 0, 0, STROKE_WIDTH/2, STROKE_WIDTH/2 },
79 { 0, 0, W, 0 },
80 { 0, 0, 0, H },
81 { 0, 0, 0, 0 },
82 { 0, 0, W, FLT_EPSILON },
83 { 0, 0, FLT_EPSILON, H },
84 { 0, 0, FLT_EPSILON, FLT_EPSILON },
85 };
86
87 for (int doFill = 0; doFill <= 1; ++doFill) {
88 for (size_t i = 0; i < SK_ARRAY_COUNT(gJoins); ++i) {
89 SkPaint::Join join = gJoins[i];
90 paint.setStrokeJoin(join);
91
92 SkAutoCanvasRestore acr(canvas, true);
93 for (size_t j = 0; j < SK_ARRAY_COUNT(gRects); ++j) {
94 const SkRect& r = gRects[j];
95
96 SkPath path, fillPath;
97 path.addRect(r);
98 paint.getFillPath(path, &fillPath);
99 draw_path(canvas, fillPath, r, join, doFill);
100
101 canvas->translate(W + 2 * STROKE_WIDTH, 0);
102 }
103 acr.restore();
104 canvas->translate(0, H + 2 * STROKE_WIDTH);
105 }
106 paint.setStyle(SkPaint::kStrokeAndFill_Style);
107 }
108 }
109
110 private:
111 typedef GM INHERITED;
112 };
113 DEF_GM(return new StrokeRectGM;)
114
115 ///////////////////////////////////////////////////////////////////////////////////////////////////
116
117 /*
118 * Exercise rect-stroking (which is specialized from paths) when the resulting stroke-width is
119 * non-square. See https://bugs.chromium.org/p/skia/issues/detail?id=5408
120 */
121 DEF_SIMPLE_GM(strokerect_anisotropic_5408, canvas, 200, 50) {
122 SkPaint p;
123 p.setStyle(SkPaint::kStroke_Style);
124 p.setStrokeWidth(6);
125
126 canvas->scale(10, 1);
127 SkRect r = SkRect::MakeXYWH(5, 20, 10, 10);
128 canvas->drawRect(r, p);
129 }
130