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#include "qfontengine_p.h"

#include <private/qunicodetables_p.h>

#include <qwsdisplay_qws.h>

#include <qvarlengtharray.h>

#include <private/qpainter_p.h>

#include <private/qpaintengine_raster_p.h>

#include <private/qpdf_p.h>

#include "qtextengine_p.h"

#include "private/qcore_unix_p.h" // overrides QT_OPEN

#include <qdebug.h>

#ifndef QT_NO_QWS_QPF

#include "qfile.h"

#include "qdir.h"

#define QT_USE_MMAP

#include <stdlib.h>

#ifdef QT_USE_MMAP

// for mmap

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/mman.h>

#include <fcntl.h>

#include <errno.h>

#  if defined(QT_LINUXBASE) && !defined(MAP_FILE)

     // LSB 3.2 does not define MAP_FILE

#    define MAP_FILE 0

#  endif

#endif

#endif // QT_NO_QWS_QPF

QT_BEGIN_NAMESPACE

#ifndef QT_NO_QWS_QPF

QT_BEGIN_INCLUDE_NAMESPACE

#include "qplatformdefs.h"

QT_END_INCLUDE_NAMESPACE

static inline unsigned int getChar(const QChar *str, int &i, const int len)

{

    unsigned int uc = str[i].unicode();

    if (uc >= 0xd800 && uc < 0xdc00 && i < len-1) {

        uint low = str[i+1].unicode();

       if (low >= 0xdc00 && low < 0xe000) {

            uc = (uc - 0xd800)*0x400 + (low - 0xdc00) + 0x10000;

            ++i;

        }

    }

    return uc;

}

#define FM_SMOOTH 1

class Q_PACKED QPFGlyphMetrics {

public:

    quint8 linestep;

    quint8 width;

    quint8 height;

    quint8 flags;

    qint8 bearingx;      // Difference from pen position to glyph's left bbox

    quint8 advance;       // Difference between pen positions

    qint8 bearingy;      // Used for putting characters on baseline

    qint8 reserved;      // Do not use

    // Flags:

    // RendererOwnsData - the renderer is responsible for glyph data

    //                    memory deletion otherwise QPFGlyphTree must

    //                    delete [] the data when the glyph is deleted.

    enum Flags { RendererOwnsData=0x01 };

};

class QPFGlyph {

public:

    QPFGlyph() { metrics=0; data=0; }

    QPFGlyph(QPFGlyphMetrics* m, uchar* d) :

	metrics(m), data(d) { }

    ~QPFGlyph() {}

    QPFGlyphMetrics* metrics;

    uchar* data;

};

struct Q_PACKED QPFFontMetrics{

    qint8 ascent,descent;

    qint8 leftbearing,rightbearing;

    quint8 maxwidth;

    qint8 leading;

    quint8 flags;

    quint8 underlinepos;

    quint8 underlinewidth;

    quint8 reserved3;

};

class QPFGlyphTree {

public:

    /* reads in a tree like this:

       A-Z

       /   \

       0-9   a-z

       etc.

    */

    glyph_t min,max;

    QPFGlyphTree* less;

    QPFGlyphTree* more;

    QPFGlyph* glyph;

public:

#ifdef QT_USE_MMAP

    QPFGlyphTree(uchar*& data)

    {

        read(data);

    }

#else

    QPFGlyphTree(QIODevice& f)

    {

        read(f);

    }

#endif

    ~QPFGlyphTree()

    {

        // NOTE: does not delete glyph[*].metrics or .data.

        //       the caller does this (only they know who owns

        //       the data).  See clear().

        delete less;

        delete more;

        delete [] glyph;

    }

    bool inFont(glyph_t g) const

    {

        if ( g < min ) {

            if ( !less )

                return false;

            return less->inFont(g);

        } else if ( g > max ) {

            if ( !more )

                return false;

            return more->inFont(g);

        }

        return true;

    }

    QPFGlyph* get(glyph_t g)

    {

        if ( g < min ) {

            if ( !less )

                return 0;

            return less->get(g);

        } else if ( g > max ) {

            if ( !more )

                return 0;

            return more->get(g);

        }

        return &glyph[g - min];

    }

    int totalChars() const

    {

        if ( !this ) return 0;

        return max-min+1 + less->totalChars() + more->totalChars();

    }

    int weight() const

    {

        if ( !this ) return 0;

        return 1 + less->weight() + more->weight();

    }

    void dump(int indent=0)

    {

        for (int i=0; i<indent; i++) printf(" ");

        printf("%d..%d",min,max);

        //if ( indent == 0 )

        printf(" (total %d)",totalChars());

        printf("\n");

        if ( less ) less->dump(indent+1);

        if ( more ) more->dump(indent+1);

    }

private:

    QPFGlyphTree()

    {

    }

#ifdef QT_USE_MMAP

    void read(uchar*& data)

    {

        // All node data first

        readNode(data);

        // Then all non-video data

        readMetrics(data);

        // Then all video data

        readData(data);

    }

#else

    void read(QIODevice& f)

    {

        // All node data first

        readNode(f);

        // Then all non-video data

        readMetrics(f);

        // Then all video data

        readData(f);

    }

#endif

#ifdef QT_USE_MMAP

    void readNode(uchar*& data)

    {

        uchar rw = *data++;

        uchar cl = *data++;

        min = (rw << 8) | cl;

        rw = *data++;

        cl = *data++;

        max = (rw << 8) | cl;

        int flags = *data++;

        if ( flags & 1 )

            less = new QPFGlyphTree;

        else

            less = 0;

        if ( flags & 2 )

            more = new QPFGlyphTree;

        else

            more = 0;

        int n = max-min+1;

        glyph = new QPFGlyph[n];

        if ( less )

            less->readNode(data);

        if ( more )

            more->readNode(data);

    }

#else

    void readNode(QIODevice& f)

    {

        uchar rw = f.getch();

        uchar cl = f.getch();

        min = (rw << 8) | cl;

        rw = f.getch();

        cl = f.getch();

        max = (rw << 8) | cl;

        int flags = f.getch();

        if ( flags & 1 )

            less = new QPFGlyphTree;

        else

            less = 0;

        if ( flags & 2 )

            more = new QPFGlyphTree;

        else

            more = 0;

        int n = max-min+1;

        glyph = new QPFGlyph[n];

        if ( less )

            less->readNode(f);

        if ( more )

            more->readNode(f);

    }

#endif

#ifdef QT_USE_MMAP

    void readMetrics(uchar*& data)

    {

        int n = max-min+1;

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

            glyph[i].metrics = (QPFGlyphMetrics*)data;

            data += sizeof(QPFGlyphMetrics);

        }

        if ( less )

            less->readMetrics(data);

        if ( more )

            more->readMetrics(data);

    }

#else

    void readMetrics(QIODevice& f)

    {

        int n = max-min+1;

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

            glyph[i].metrics = new QPFGlyphMetrics;

            f.readBlock((char*)glyph[i].metrics, sizeof(QPFGlyphMetrics));

        }

        if ( less )

            less->readMetrics(f);

        if ( more )

            more->readMetrics(f);

    }

#endif

#ifdef QT_USE_MMAP

    void readData(uchar*& data)

    {

        int n = max-min+1;

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

            QSize s( glyph[i].metrics->width, glyph[i].metrics->height );

            //######### s = qt_screen->mapToDevice( s );

            uint datasize = glyph[i].metrics->linestep * s.height();

            glyph[i].data = data; data += datasize;

        }

        if ( less )

            less->readData(data);

        if ( more )

            more->readData(data);

    }

#else

    void readData(QIODevice& f)

    {

        int n = max-min+1;

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

            QSize s( glyph[i].metrics->width, glyph[i].metrics->height );

            //############### s = qt_screen->mapToDevice( s );

            uint datasize = glyph[i].metrics->linestep * s.height();

            glyph[i].data = new uchar[datasize]; // ### deleted?

            f.readBlock((char*)glyph[i].data, datasize);

        }

        if ( less )

            less->readData(f);

        if ( more )

            more->readData(f);

    }

#endif

};

class QFontEngineQPF1Data

{

public:

    QPFFontMetrics fm;

    QPFGlyphTree *tree;

    void *mmapStart;

    size_t mmapLength;

};

QFontEngineQPF1::QFontEngineQPF1(const QFontDef&, const QString &fn)

{

    cache_cost = 1;

    int f = QT_OPEN( QFile::encodeName(fn), O_RDONLY, 0);

    Q_ASSERT(f>=0);

    QT_STATBUF st;

    if ( QT_FSTAT( f, &st ) )

        qFatal("Failed to stat %s",QFile::encodeName(fn).data());

    uchar* data = (uchar*)mmap( 0, // any address

                                st.st_size, // whole file

                                PROT_READ, // read-only memory

#if !defined(Q_OS_SOLARIS) && !defined(Q_OS_QNX4) && !defined(Q_OS_INTEGRITY) && !defined(Q_OS_VXWORKS)

                                MAP_FILE | MAP_PRIVATE, // swap-backed map from file

#else

                                MAP_PRIVATE,

#endif

                                f, 0 ); // from offset 0 of f

#if defined(Q_OS_QNX4) && !defined(MAP_FAILED)

#define MAP_FAILED ((void *)-1)

#endif

    if ( !data || data == (uchar*)MAP_FAILED )

        qFatal("Failed to mmap %s",QFile::encodeName(fn).data());

    QT_CLOSE(f);

    d = new QFontEngineQPF1Data;

    d->mmapStart = data;

    d->mmapLength = st.st_size;

    memcpy(reinterpret_cast<char*>(&d->fm),data,sizeof(d->fm));

    data += sizeof(d->fm);

    d->tree = new QPFGlyphTree(data);

    glyphFormat = (d->fm.flags & FM_SMOOTH) ? QFontEngineGlyphCache::Raster_A8

                  : QFontEngineGlyphCache::Raster_Mono;

#if 0

    qDebug() << "font file" << fn

             << "ascent" << d->fm.ascent << "descent" << d->fm.descent

             << "leftbearing" << d->fm.leftbearing

             << "rightbearing" << d->fm.rightbearing

             << "maxwidth" << d->fm.maxwidth

             << "leading" << d->fm.leading

             << "flags" << d->fm.flags

             << "underlinepos" << d->fm.underlinepos

             << "underlinewidth" << d->fm.underlinewidth;

#endif

}

QFontEngineQPF1::~QFontEngineQPF1()

{

    if (d->mmapStart)

        munmap(d->mmapStart, d->mmapLength);

    delete d->tree;

    delete d;

}

bool QFontEngineQPF1::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const

{

    if(*nglyphs < len) {

        *nglyphs = len;

        return false;

    }

    *nglyphs = 0;

    bool mirrored = flags & QTextEngine::RightToLeft;

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

        unsigned int uc = getChar(str, i, len);

        if (mirrored)

            uc = QChar::mirroredChar(uc);

        glyphs->glyphs[*nglyphs] = uc < 0x10000 ? uc : 0;

        ++*nglyphs;

    }

    glyphs->numGlyphs = *nglyphs;

    if (flags & QTextEngine::GlyphIndicesOnly)

        return true;

    recalcAdvances(glyphs, flags);

    return true;

}

void QFontEngineQPF1::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags) const

{

    for(int i = 0; i < glyphs->numGlyphs; i++) {

        QPFGlyph *glyph = d->tree->get(glyphs->glyphs[i]);

        glyphs->advances_x[i] = glyph ? glyph->metrics->advance : 0;

        glyphs->advances_y[i] = 0;

        if (!glyph)

            glyphs->glyphs[i] = 0;

    }

}

void QFontEngineQPF1::draw(QPaintEngine *p, qreal _x, qreal _y, const QTextItemInt &si)

{

    QPaintEngineState *pState = p->state;

    QRasterPaintEngine *paintEngine = static_cast<QRasterPaintEngine*>(p);

    QTransform matrix = pState->transform();

    matrix.translate(_x, _y);

    QFixed x = QFixed::fromReal(matrix.dx());

    QFixed y = QFixed::fromReal(matrix.dy());

    QVarLengthArray<QFixedPoint> positions;

    QVarLengthArray<glyph_t> glyphs;

    getGlyphPositions(si.glyphs, matrix, si.flags, glyphs, positions);

    if (glyphs.size() == 0)

        return;

    int depth = (d->fm.flags & FM_SMOOTH) ? 8 : 1;

    for(int i = 0; i < glyphs.size(); i++) {

        const QPFGlyph *glyph = d->tree->get(glyphs[i]);

        if (!glyph)

            continue;

        int bpl = glyph->metrics->linestep;

        if(glyph->data)

            paintEngine->alphaPenBlt(glyph->data, bpl, depth,

                                     qRound(positions[i].x) + glyph->metrics->bearingx,

                                     qRound(positions[i].y) - glyph->metrics->bearingy,

                                     glyph->metrics->width,glyph->metrics->height);

    }

}

QImage QFontEngineQPF1::alphaMapForGlyph(glyph_t g)

{

    const QPFGlyph *glyph = d->tree->get(g);

    if (!glyph)

	return QImage();

    int mono = !(d->fm.flags & FM_SMOOTH);

    const uchar *bits = glyph->data;//((const uchar *) glyph);

    QImage image;