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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);

        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\n",

           controlPointRect.x(), controlPointRect.y(),

           controlPointRect.width(), controlPointRect.height());

#endif

    // Check for out of dev bounds...

    const bool do_clip = (controlPointRect.left() < -QT_RASTER_COORD_LIMIT

                          || controlPointRect.right() > QT_RASTER_COORD_LIMIT

                          || controlPointRect.top() < -QT_RASTER_COORD_LIMIT

                          || controlPointRect.bottom() > QT_RASTER_COORD_LIMIT);

    if (do_clip) {

        clipElements(elements, elementTypes(), element_count);

    } else {

        convertElements(elements, elementTypes(), element_count);

    }

}

void QOutlineMapper::convertElements(const QPointF *elements,

                                       const QPainterPath::ElementType *types,

                                       int element_count)

{

    if (types) {

        // Translate into FT coords

        const QPointF *e = elements;

        for (int i=0; i<element_count; ++i) {

            switch (*types) {

            case QPainterPath::MoveToElement:

                {

                    QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),

                                              qreal_to_fixed_26_6(e->y()) };

                    if (i != 0)

                        m_contours << m_points.size() - 1;

                    m_points << pt_fixed;

                    m_tags <<  QT_FT_CURVE_TAG_ON;

                }

                break;

            case QPainterPath::LineToElement:

                {

                    QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),

                                              qreal_to_fixed_26_6(e->y()) };

                    m_points << pt_fixed;

                    m_tags << QT_FT_CURVE_TAG_ON;

                }

                break;

            case QPainterPath::CurveToElement:

                {

                    QT_FT_Vector cp1_fixed = { qreal_to_fixed_26_6(e->x()),

                                               qreal_to_fixed_26_6(e->y()) };

                    ++e;

                    QT_FT_Vector cp2_fixed = { qreal_to_fixed_26_6((e)->x()),

                                               qreal_to_fixed_26_6((e)->y()) };

                    ++e;

                    QT_FT_Vector ep_fixed = { qreal_to_fixed_26_6((e)->x()),

                                              qreal_to_fixed_26_6((e)->y()) };

                    m_points << cp1_fixed << cp2_fixed << ep_fixed;

                    m_tags << QT_FT_CURVE_TAG_CUBIC

                           << QT_FT_CURVE_TAG_CUBIC

                           << QT_FT_CURVE_TAG_ON;

                    types += 2;

                    i += 2;

                }

                break;

            default:

                break;

            }

            ++types;

            ++e;

        }

    } else {

        // Plain polygon...

        const QPointF *last = elements + element_count;

        const QPointF *e = elements;

        while (e < last) {

            QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),

                                      qreal_to_fixed_26_6(e->y()) };

            m_points << pt_fixed;

            m_tags << QT_FT_CURVE_TAG_ON;

            ++e;

        }

    }

    // close the very last subpath

    m_contours << m_points.size() - 1;

    m_outline.n_contours = m_contours.size();

    m_outline.n_points = m_points.size();

    m_outline.points = m_points.data();

    m_outline.tags = m_tags.data();

    m_outline.contours = m_contours.data();

#ifdef QT_DEBUG_CONVERT

    printf("QOutlineMapper::endOutline\n");

    printf(" - contours: %d\n", m_outline.n_contours);

    for (int i=0; i<m_outline.n_contours; ++i) {

        printf("   - %d\n", m_outline.contours[i]);

    }

    printf(" - points: %d\n", m_outline.n_points);

    for (int i=0; i<m_outline.n_points; ++i) {

        printf("   - %d -- %.2f, %.2f, (%d, %d)\n", i,

               (double) (m_outline.points[i].x / 64.0),

               (double) (m_outline.points[i].y / 64.0),

               (int) m_outline.points[i].x, (int) m_outline.points[i].y);

    }

#endif

}

void QOutlineMapper::clipElements(const QPointF *elements,

                                    const QPainterPath::ElementType *types,

                                    int element_count)

{

    // We could save a bit of time by actually implementing them fully

    // instead of going through convenience functionallity, but since

    // this part of code hardly every used, it shouldn't matter.

    QPainterPath path;

    if (types) {

        for (int i=0; i<element_count; ++i) {

            switch (types[i]) {

            case QPainterPath::MoveToElement:

                path.moveTo(elements[i]);

                break;

            case QPainterPath::LineToElement:

                path.lineTo(elements[i]);

                break;

            case QPainterPath::CurveToElement:

                path.cubicTo(elements[i], elements[i+1], elements[i+2]);

                i += 2;

                break;

            default:

                break;

            }

        }

    } else {

        path.moveTo(elements[0]);

        for (int i=1; i<element_count; ++i)

            path.lineTo(elements[i]);

    }

    QPainterPath clipPath;

    clipPath.addRect(m_clip_rect);

    QPainterPath clippedPath = path.intersected(clipPath);

    uint old_txop = m_txop;

    m_txop = QTransform::TxNone;

    if (clippedPath.isEmpty())

        m_valid = false;

    else

        convertPath(clippedPath);

    m_txop = old_txop;

}

QT_END_NAMESPACE