/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtOpenGL module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QTRIANGULATINGSTROKER_P_H+
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#define QTRIANGULATINGSTROKER_P_H+
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+
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#include <private/qdatabuffer_p.h>+
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#include <qvarlengtharray.h>+
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#include <private/qvectorpath_p.h>+
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#include <private/qbezier_p.h>+
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#include <private/qnumeric_p.h>+
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#include <private/qmath_p.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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class QTriangulatingStroker+
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{+
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public:+
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    QTriangulatingStroker() : m_vertices(0) {}+
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    void process(const QVectorPath &path, const QPen &pen, const QRectF &clip);+
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+
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    inline int vertexCount() const { return m_vertices.size(); }+
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    inline const float *vertices() const { return m_vertices.data(); }+
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+
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    inline void setInvScale(qreal invScale) { m_inv_scale = invScale; }+
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+
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private:+
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    inline void emitLineSegment(float x, float y, float nx, float ny);+
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    void moveTo(const qreal *pts);+
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    inline void lineTo(const qreal *pts);+
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    void cubicTo(const qreal *pts);+
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    void join(const qreal *pts);+
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    inline void normalVector(float x1, float y1, float x2, float y2, float *nx, float *ny);+
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    void endCap(const qreal *pts);+
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    void arcPoints(float cx, float cy, float fromX, float fromY, float toX, float toY, QVarLengthArray<float> &points);+
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    void endCapOrJoinClosed(const qreal *start, const qreal *cur, bool implicitClose, bool endsAtStart);+
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+
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+
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    QDataBuffer<float> m_vertices;+
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+
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    float m_cx, m_cy;           // current points+
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    float m_nvx, m_nvy;         // normal vector...+
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    float m_width;+
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    qreal m_miter_limit;+
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+
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    int m_roundness;            // Number of line segments in a round join+
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    qreal m_sin_theta;          // sin(m_roundness / 360);+
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    qreal m_cos_theta;          // cos(m_roundness / 360);+
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    qreal m_inv_scale;+
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    float m_curvyness_mul;+
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    float m_curvyness_add;+
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+
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    Qt::PenJoinStyle m_join_style;+
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    Qt::PenCapStyle m_cap_style;+
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};+
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+
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class QDashedStrokeProcessor+
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{+
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public:+
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    QDashedStrokeProcessor();+
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+
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    void process(const QVectorPath &path, const QPen &pen, const QRectF &clip);+
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+
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    inline void addElement(QPainterPath::ElementType type, qreal x, qreal y) {+
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        m_points.add(x);+
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        m_points.add(y);+
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        m_types.add(type);+
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    }+
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+
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    inline int elementCount() const { return m_types.size(); }+
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    inline qreal *points() const { return m_points.data(); }+
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    inline QPainterPath::ElementType *elementTypes() const { return m_types.data(); }+
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+
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    inline void setInvScale(qreal invScale) { m_inv_scale = invScale; }+
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+
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private:+
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    QDataBuffer<qreal> m_points;+
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    QDataBuffer<QPainterPath::ElementType> m_types;+
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    QDashStroker m_dash_stroker;+
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    qreal m_inv_scale;+
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};+
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+
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inline void QTriangulatingStroker::normalVector(float x1, float y1, float x2, float y2,+
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                                                float *nx, float *ny)+
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{+
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    float dx = x2 - x1;+
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    float dy = y2 - y1;+
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+
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    float pw;+
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+
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    if (dx == 0)+
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        pw = m_width / qAbs(dy);+
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    else if (dy == 0)+
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        pw = m_width / qAbs(dx);+
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    else+
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        pw = m_width / sqrt(dx*dx + dy*dy);+
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+
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    *nx = -dy * pw;+
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    *ny = dx * pw;+
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}+
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+
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inline void QTriangulatingStroker::emitLineSegment(float x, float y, float vx, float vy)+
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{+
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    m_vertices.add(x + vx);+
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    m_vertices.add(y + vy);+
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    m_vertices.add(x - vx);+
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    m_vertices.add(y - vy);+
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}+
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+
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void QTriangulatingStroker::lineTo(const qreal *pts)+
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{+
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    emitLineSegment(pts[0], pts[1], m_nvx, m_nvy);+
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    m_cx = pts[0];+
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    m_cy = pts[1];+
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}+
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+
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QT_END_NAMESPACE+
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+
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#endif+
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