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39 
40 #ifndef QCOSMETICSTROKER_P_H
41 #define QCOSMETICSTROKER_P_H
42 
43 //
44 //  W A R N I N G
45 //  -------------
46 //
47 // This file is not part of the Qt API.  It exists purely as an
48 // implementation detail.  This header file may change from version to
49 // version without notice, or even be removed.
50 //
51 // We mean it.
52 //
53 
54 #include <QtGui/private/qtguiglobal_p.h>
55 #include <private/qdrawhelper_p.h>
56 #include <private/qvectorpath_p.h>
57 #include <private/qpaintengine_raster_p.h>
58 #include <qpen.h>
59 
60 QT_BEGIN_NAMESPACE
61 
62 
63 class QCosmeticStroker;
64 
65 
66 typedef bool (*StrokeLine)(QCosmeticStroker *stroker, qreal x1, qreal y1, qreal x2, qreal y2, int caps);
67 
68 class QCosmeticStroker
69 {
70 public:
71     struct Point {
72         int x;
73         int y;
74     };
75     struct PointF {
76         qreal x;
77         qreal y;
78     };
79 
80     enum Caps {
81         NoCaps = 0,
82         CapBegin = 0x1,
83         CapEnd = 0x2
84     };
85 
86     // used to avoid drop outs or duplicated points
87     enum Direction {
88         NoDirection = 0,
89         TopToBottom = 0x1,
90         BottomToTop = 0x2,
91         LeftToRight = 0x4,
92         RightToLeft = 0x8,
93         VerticalMask = 0x3,
94         HorizontalMask = 0xc
95     };
96 
QCosmeticStroker(QRasterPaintEngineState * s,const QRect & dr,const QRect & dr_unclipped)97     QCosmeticStroker(QRasterPaintEngineState *s, const QRect &dr, const QRect &dr_unclipped)
98         : state(s),
99           deviceRect(dr_unclipped),
100           clip(dr),
101           pattern(nullptr),
102           reversePattern(nullptr),
103           patternSize(0),
104           patternLength(0),
105           patternOffset(0),
106           legacyRounding(false),
107           current_span(0),
108           lastDir(NoDirection),
109           lastAxisAligned(false)
110     { setup(); }
111 
~QCosmeticStroker()112     ~QCosmeticStroker() { free(pattern); free(reversePattern); }
113 
setLegacyRoundingEnabled(bool legacyRoundingEnabled)114     void setLegacyRoundingEnabled(bool legacyRoundingEnabled) { legacyRounding = legacyRoundingEnabled; }
115 
116     void drawLine(const QPointF &p1, const QPointF &p2);
117     void drawPath(const QVectorPath &path);
118     void drawPoints(const QPoint *points, int num);
119     void drawPoints(const QPointF *points, int num);
120 
121 
122     QRasterPaintEngineState *state;
123     QRect deviceRect;
124     QRect clip;
125     // clip bounds in real
126     qreal xmin, xmax;
127     qreal ymin, ymax;
128 
129     StrokeLine stroke;
130     bool drawCaps;
131 
132     int *pattern;
133     int *reversePattern;
134     int patternSize;
135     int patternLength;
136     int patternOffset;
137 
138     bool legacyRounding;
139 
140     enum { NSPANS = 255 };
141     QT_FT_Span spans[NSPANS];
142     int current_span;
143     ProcessSpans blend;
144 
145     int opacity;
146 
147     uint color;
148     uint *pixels;
149     int ppl;
150 
151     Direction lastDir;
152     Point lastPixel;
153     bool lastAxisAligned;
154 
155 private:
156     void setup();
157 
158     void renderCubic(const QPointF &p1, const QPointF &p2, const QPointF &p3, const QPointF &p4, int caps);
159     void renderCubicSubdivision(PointF *points, int level, int caps);
160     // used for closed subpaths
161     void calculateLastPoint(qreal rx1, qreal ry1, qreal rx2, qreal ry2);
162 
163 public:
164     bool clipLine(qreal &x1, qreal &y1, qreal &x2, qreal &y2);
165 };
166 
167 QT_END_NAMESPACE
168 
169 #endif // QCOSMETICLINE_H
170