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 "SkStrokeRec.h"
9 #include "SkPaintDefaults.h"
10
11 // must be < 0, since ==0 means hairline, and >0 means normal stroke
12 #define kStrokeRec_FillStyleWidth (-SK_Scalar1)
13
SkStrokeRec(InitStyle s)14 SkStrokeRec::SkStrokeRec(InitStyle s) {
15 fResScale = 1;
16 fWidth = (kFill_InitStyle == s) ? kStrokeRec_FillStyleWidth : 0;
17 fMiterLimit = SkPaintDefaults_MiterLimit;
18 fCap = SkPaint::kDefault_Cap;
19 fJoin = SkPaint::kDefault_Join;
20 fStrokeAndFill = false;
21 }
22
SkStrokeRec(const SkStrokeRec & src)23 SkStrokeRec::SkStrokeRec(const SkStrokeRec& src) {
24 memcpy(this, &src, sizeof(src));
25 }
26
SkStrokeRec(const SkPaint & paint,SkScalar resScale)27 SkStrokeRec::SkStrokeRec(const SkPaint& paint, SkScalar resScale) {
28 this->init(paint, paint.getStyle(), resScale);
29 }
30
SkStrokeRec(const SkPaint & paint,SkPaint::Style styleOverride,SkScalar resScale)31 SkStrokeRec::SkStrokeRec(const SkPaint& paint, SkPaint::Style styleOverride, SkScalar resScale) {
32 this->init(paint, styleOverride, resScale);
33 }
34
init(const SkPaint & paint,SkPaint::Style style,SkScalar resScale)35 void SkStrokeRec::init(const SkPaint& paint, SkPaint::Style style, SkScalar resScale) {
36 fResScale = resScale;
37
38 switch (style) {
39 case SkPaint::kFill_Style:
40 fWidth = kStrokeRec_FillStyleWidth;
41 fStrokeAndFill = false;
42 break;
43 case SkPaint::kStroke_Style:
44 fWidth = paint.getStrokeWidth();
45 fStrokeAndFill = false;
46 break;
47 case SkPaint::kStrokeAndFill_Style:
48 if (0 == paint.getStrokeWidth()) {
49 // hairline+fill == fill
50 fWidth = kStrokeRec_FillStyleWidth;
51 fStrokeAndFill = false;
52 } else {
53 fWidth = paint.getStrokeWidth();
54 fStrokeAndFill = true;
55 }
56 break;
57 default:
58 SkDEBUGFAIL("unknown paint style");
59 // fall back on just fill
60 fWidth = kStrokeRec_FillStyleWidth;
61 fStrokeAndFill = false;
62 break;
63 }
64
65 // copy these from the paint, regardless of our "style"
66 fMiterLimit = paint.getStrokeMiter();
67 fCap = paint.getStrokeCap();
68 fJoin = paint.getStrokeJoin();
69 }
70
getStyle() const71 SkStrokeRec::Style SkStrokeRec::getStyle() const {
72 if (fWidth < 0) {
73 return kFill_Style;
74 } else if (0 == fWidth) {
75 return kHairline_Style;
76 } else {
77 return fStrokeAndFill ? kStrokeAndFill_Style : kStroke_Style;
78 }
79 }
80
setFillStyle()81 void SkStrokeRec::setFillStyle() {
82 fWidth = kStrokeRec_FillStyleWidth;
83 fStrokeAndFill = false;
84 }
85
setHairlineStyle()86 void SkStrokeRec::setHairlineStyle() {
87 fWidth = 0;
88 fStrokeAndFill = false;
89 }
90
setStrokeStyle(SkScalar width,bool strokeAndFill)91 void SkStrokeRec::setStrokeStyle(SkScalar width, bool strokeAndFill) {
92 if (strokeAndFill && (0 == width)) {
93 // hairline+fill == fill
94 this->setFillStyle();
95 } else {
96 fWidth = width;
97 fStrokeAndFill = strokeAndFill;
98 }
99 }
100
101 #include "SkStroke.h"
102
103 #if !defined SK_LEGACY_STROKE_CURVES && defined SK_DEBUG
104 // enables tweaking these values at runtime from SampleApp
105 bool gDebugStrokerErrorSet = false;
106 SkScalar gDebugStrokerError;
107 #endif
108
applyToPath(SkPath * dst,const SkPath & src) const109 bool SkStrokeRec::applyToPath(SkPath* dst, const SkPath& src) const {
110 if (fWidth <= 0) { // hairline or fill
111 return false;
112 }
113
114 SkStroke stroker;
115 stroker.setCap(fCap);
116 stroker.setJoin(fJoin);
117 stroker.setMiterLimit(fMiterLimit);
118 stroker.setWidth(fWidth);
119 stroker.setDoFill(fStrokeAndFill);
120 #if !defined SK_LEGACY_STROKE_CURVES && defined SK_DEBUG
121 stroker.setResScale(gDebugStrokerErrorSet ? gDebugStrokerError : fResScale);
122 #else
123 stroker.setResScale(fResScale);
124 #endif
125 stroker.strokePath(src, dst);
126 return true;
127 }
128
applyToPaint(SkPaint * paint) const129 void SkStrokeRec::applyToPaint(SkPaint* paint) const {
130 if (fWidth < 0) { // fill
131 paint->setStyle(SkPaint::kFill_Style);
132 return;
133 }
134
135 paint->setStyle(fStrokeAndFill ? SkPaint::kStrokeAndFill_Style : SkPaint::kStroke_Style);
136 paint->setStrokeWidth(fWidth);
137 paint->setStrokeMiter(fMiterLimit);
138 paint->setStrokeCap(fCap);
139 paint->setStrokeJoin(fJoin);
140 }
141