source: trunk/src/gui/painting/qoutlinemapper.cpp@ 938

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#include "qoutlinemapper_p.h"
#include <private/qpainterpath_p.h>
#include "qmath.h"

#include <stdlib.h>

QT_BEGIN_NAMESPACE

static const qreal aliasedCoordinateDelta = 0.5 - 0.015625;

#define qreal_to_fixed_26_6(f) (int(f * 64))




static const QRectF boundingRect(const QPointF *points, int pointCount)
{
    const QPointF *e = points;
    const QPointF *last = points + pointCount;
    qreal minx, maxx, miny, maxy;
    minx = maxx = e->x();
    miny = maxy = e->y();
    while (++e < last) {
        if (e->x() < minx)
            minx = e->x();
        else if (e->x() > maxx)
            maxx = e->x();
        if (e->y() < miny)
            miny = e->y();
        else if (e->y() > maxy)
            maxy = e->y();
    }
    return QRectF(QPointF(minx, miny), QPointF(maxx, maxy));
}


QT_FT_Outline *QOutlineMapper::convertPath(const QPainterPath &path)
{
    Q_ASSERT(!path.isEmpty());
    int elmCount = path.elementCount();
#ifdef QT_DEBUG_CONVERT
    printf("QOutlineMapper::convertPath(), size=%d\n", elmCount);
#endif
    beginOutline(path.fillRule());

    for (int index=0; index<elmCount; ++index) {
        const QPainterPath::Element &elm = path.elementAt(index);

        switch (elm.type) {

        case QPainterPath::MoveToElement:
            if (index == elmCount - 1)
                continue;
            moveTo(elm);
            break;

        case QPainterPath::LineToElement:
            lineTo(elm);
            break;

        case QPainterPath::CurveToElement:
            curveTo(elm, path.elementAt(index + 1), path.elementAt(index + 2));
            index += 2;
            break;

        default:
            break; // This will never hit..
        }
    }

    endOutline();
    return outline();
}

QT_FT_Outline *QOutlineMapper::convertPath(const QVectorPath &path)
{
    int count = path.elementCount();

#ifdef QT_DEBUG_CONVERT
    printf("QOutlineMapper::convertPath(VP), size=%d\n", count);
#endif
    beginOutline(path.hasWindingFill() ? Qt::WindingFill : Qt::OddEvenFill);

    if (path.elements()) {
        // TODO: if we do closing of subpaths in convertElements instead we
        // could avoid this loop
        const QPainterPath::ElementType *elements = path.elements();
        const QPointF *points = reinterpret_cast<const QPointF *>(path.points());

        for (int index = 0; index < count; ++index) {
            switch (elements[index]) {
                case QPainterPath::MoveToElement:
                    if (index == count - 1)
                        continue;
                    moveTo(points[index]);
                    break;

                case QPainterPath::LineToElement:
                    lineTo(points[index]);
                    break;

                case QPainterPath::CurveToElement:
                    curveTo(points[index], points[index+1], points[index+2]);
                    index += 2;
                    break;

                default:
                    break; // This will never hit..
            }
        }

    } else {
        // ### We can kill this copying and just use the buffer straight...

        m_elements.resize(count);
        if (count)
            memcpy(m_elements.data(), path.points(), count* sizeof(QPointF));

        m_element_types.resize(0);
    }

    endOutline();
    return outline();
}


void QOutlineMapper::endOutline()
{
    closeSubpath();

    int element_count = m_elements.size();

    if (element_count == 0) {
        memset(&m_outline, 0, sizeof(m_outline));
        return;
    }

    QPointF *elements;

    // Transform the outline
    if (m_txop == QTransform::TxNone) {
        elements = m_elements.data();
    } else {
        if (m_txop == QTransform::TxTranslate) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(e.x() + m_dx, e.y() + m_dy);
            }
        } else if (m_txop == QTransform::TxScale) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(m_m11 * e.x() + m_dx, m_m22 * e.y() + m_dy);
            }
        } else if (m_txop < QTransform::TxProject) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(m_m11 * e.x() + m_m21 * e.y() + m_dx,
                                          m_m22 * e.y() + m_m12 * e.x() + m_dy);
            }
        } else {
            const QVectorPath vp((qreal *)m_elements.data(), m_elements.size(), m_element_types.size() ? m_element_types.data() : 0);
            QPainterPath path = vp.convertToPainterPath();
            path = QTransform(m_m11, m_m12, m_m13, m_m21, m_m22, m_m23, m_dx, m_dy, m_m33).map(path);
            if (!(m_outline.flags & QT_FT_OUTLINE_EVEN_ODD_FILL))
                path.setFillRule(Qt::WindingFill);
            uint old_txop = m_txop;
            m_txop = QTransform::TxNone;
            if (path.isEmpty())
                m_valid = false;
            else
                convertPath(path);
            m_txop = old_txop;
            return;
        }
        elements = m_elements_dev.data();
    }

    if (m_round_coords) {
        // round coordinates to match outlines drawn with drawLine_midpoint_i
        for (int i = 0; i < m_elements.size(); ++i)
            elements[i] = QPointF(qFloor(elements[i].x() + aliasedCoordinateDelta),
                                  qFloor(elements[i].y() + aliasedCoordinateDelta));
    }

    controlPointRect = boundingRect(elements, element_count);

#ifdef QT_DEBUG_CONVERT
    printf(" - control point rect (%.2f, %.2f) %.2f x %.2f, clip=(%d,%d, %dx%d)\n",
           controlPointRect.x(), controlPointRect.y(),
           controlPointRect.width(), controlPointRect.height(),
           m_clip_rect.x(), m_clip_rect.y(), m_clip_rect.width(), m_clip_rect.height());
#endif


    // Check for out of dev bounds...
    const bool do_clip = !m_in_clip_elements && ((controlPointRect.left() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.right() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.top() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.bottom() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.width() > QT_RASTER_COORD_LIMIT