aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/SkStrokeRec.cpp
blob: 6aed573418c3b4fc34629344aa7389085faa1fb2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkStrokeRec.h"
#include "SkPaintDefaults.h"

// must be < 0, since ==0 means hairline, and >0 means normal stroke
#define kStrokeRec_FillStyleWidth     (-SK_Scalar1)

SkStrokeRec::SkStrokeRec(InitStyle s) {
    fResScale       = 1;
    fWidth          = (kFill_InitStyle == s) ? kStrokeRec_FillStyleWidth : 0;
    fMiterLimit     = SkPaintDefaults_MiterLimit;
    fCap            = SkPaint::kDefault_Cap;
    fJoin           = SkPaint::kDefault_Join;
    fStrokeAndFill  = false;
}

SkStrokeRec::SkStrokeRec(const SkPaint& paint, SkScalar resScale) {
    this->init(paint, paint.getStyle(), resScale);
}

SkStrokeRec::SkStrokeRec(const SkPaint& paint, SkPaint::Style styleOverride, SkScalar resScale) {
    this->init(paint, styleOverride, resScale);
}

void SkStrokeRec::init(const SkPaint& paint, SkPaint::Style style, SkScalar resScale) {
    fResScale = resScale;

    switch (style) {
        case SkPaint::kFill_Style:
            fWidth = kStrokeRec_FillStyleWidth;
            fStrokeAndFill = false;
            break;
        case SkPaint::kStroke_Style:
            fWidth = paint.getStrokeWidth();
            fStrokeAndFill = false;
            break;
        case SkPaint::kStrokeAndFill_Style:
            if (0 == paint.getStrokeWidth()) {
                // hairline+fill == fill
                fWidth = kStrokeRec_FillStyleWidth;
                fStrokeAndFill = false;
            } else {
                fWidth = paint.getStrokeWidth();
                fStrokeAndFill = true;
            }
            break;
        default:
            SkDEBUGFAIL("unknown paint style");
            // fall back on just fill
            fWidth = kStrokeRec_FillStyleWidth;
            fStrokeAndFill = false;
            break;
    }

    // copy these from the paint, regardless of our "style"
    fMiterLimit = paint.getStrokeMiter();
    fCap        = paint.getStrokeCap();
    fJoin       = paint.getStrokeJoin();
}

SkStrokeRec::Style SkStrokeRec::getStyle() const {
    if (fWidth < 0) {
        return kFill_Style;
    } else if (0 == fWidth) {
        return kHairline_Style;
    } else {
        return fStrokeAndFill ? kStrokeAndFill_Style : kStroke_Style;
    }
}

void SkStrokeRec::setFillStyle() {
    fWidth = kStrokeRec_FillStyleWidth;
    fStrokeAndFill = false;
}

void SkStrokeRec::setHairlineStyle() {
    fWidth = 0;
    fStrokeAndFill = false;
}

void SkStrokeRec::setStrokeStyle(SkScalar width, bool strokeAndFill) {
    if (strokeAndFill && (0 == width)) {
        // hairline+fill == fill
        this->setFillStyle();
    } else {
        fWidth = width;
        fStrokeAndFill = strokeAndFill;
    }
}

#include "SkStroke.h"

#ifdef SK_DEBUG
    // enables tweaking these values at runtime from SampleApp
    bool gDebugStrokerErrorSet = false;
    SkScalar gDebugStrokerError;
#endif

bool SkStrokeRec::applyToPath(SkPath* dst, const SkPath& src) const {
    if (fWidth <= 0) {  // hairline or fill
        return false;
    }

    SkStroke stroker;
    stroker.setCap((SkPaint::Cap)fCap);
    stroker.setJoin((SkPaint::Join)fJoin);
    stroker.setMiterLimit(fMiterLimit);
    stroker.setWidth(fWidth);
    stroker.setDoFill(fStrokeAndFill);
#ifdef SK_DEBUG
    stroker.setResScale(gDebugStrokerErrorSet ? gDebugStrokerError : fResScale);
#else
    stroker.setResScale(fResScale);
#endif
    stroker.strokePath(src, dst);
    return true;
}

void SkStrokeRec::applyToPaint(SkPaint* paint) const {
    if (fWidth < 0) {  // fill
        paint->setStyle(SkPaint::kFill_Style);
        return;
    }

    paint->setStyle(fStrokeAndFill ? SkPaint::kStrokeAndFill_Style : SkPaint::kStroke_Style);
    paint->setStrokeWidth(fWidth);
    paint->setStrokeMiter(fMiterLimit);
    paint->setStrokeCap((SkPaint::Cap)fCap);
    paint->setStrokeJoin((SkPaint::Join)fJoin);
}