1 /*
2  * Copyright 2006 The Android Open Source Project
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 #ifndef SkStroke_DEFINED
9 #define SkStroke_DEFINED
10 
11 #include "SkPath.h"
12 #include "SkPoint.h"
13 #include "SkPaint.h"
14 #include "SkStrokerPriv.h"
15 
16 #ifdef SK_DEBUG
17 extern bool gDebugStrokerErrorSet;
18 extern SkScalar gDebugStrokerError;
19 extern int gMaxRecursion[];
20 #endif
21 
22 /** \class SkStroke
23     SkStroke is the utility class that constructs paths by stroking
24     geometries (lines, rects, ovals, roundrects, paths). This is
25     invoked when a geometry or text is drawn in a canvas with the
26     kStroke_Mask bit set in the paint.
27 */
28 class SkStroke {
29 public:
30     SkStroke();
31     SkStroke(const SkPaint&);
32     SkStroke(const SkPaint&, SkScalar width);   // width overrides paint.getStrokeWidth()
33 
34     SkPaint::Cap    getCap() const { return (SkPaint::Cap)fCap; }
35     void        setCap(SkPaint::Cap);
36 
37     SkPaint::Join   getJoin() const { return (SkPaint::Join)fJoin; }
38     void        setJoin(SkPaint::Join);
39 
40     void    setMiterLimit(SkScalar);
41     void    setWidth(SkScalar);
42 
43     bool    getDoFill() const { return SkToBool(fDoFill); }
44     void    setDoFill(bool doFill) { fDoFill = SkToU8(doFill); }
45 
46     /**
47      *  ResScale is the "intended" resolution for the output.
48      *      Default is 1.0.
49      *      Larger values (res > 1) indicate that the result should be more precise, since it will
50      *          be zoomed up, and small errors will be magnified.
51      *      Smaller values (0 < res < 1) indicate that the result can be less precise, since it will
52      *          be zoomed down, and small errors may be invisible.
53      */
54     SkScalar getResScale() const { return fResScale; }
55     void setResScale(SkScalar rs) {
56         SkASSERT(rs > 0 && SkScalarIsFinite(rs));
57         fResScale = rs;
58     }
59 
60     /**
61      *  Stroke the specified rect, winding it in the specified direction..
62      */
63     void    strokeRect(const SkRect& rect, SkPath* result,
64                        SkPath::Direction = SkPath::kCW_Direction) const;
65     void    strokePath(const SkPath& path, SkPath*) const;
66 
67     ////////////////////////////////////////////////////////////////
68 
69 private:
70     SkScalar    fWidth, fMiterLimit;
71     SkScalar    fResScale;
72     uint8_t     fCap, fJoin;
73     SkBool8     fDoFill;
74 
75     friend class SkPaint;
76 };
77 
78 #endif
79