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** contained in the Technology Preview License Agreement accompanying
** this package.
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****************************************************************************/

#include "qdir.h"
#include "qmetatype.h"
#include "qtextstream.h"
#include "qvariant.h"
#include "qfontengine_ft_p.h"

#ifndef QT_NO_FREETYPE

#include "qfile.h"
#include "qabstractfileengine.h"
#include "qthreadstorage.h"
#include <qmath.h>
#include <private/qpdf_p.h>
#include <private/qharfbuzz_p.h>

#include "qfontengine_ft_p.h"
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_OUTLINE_H
#include FT_TRUETYPE_TABLES_H
#include FT_TYPE1_TABLES_H
#include FT_GLYPH_H

#if defined(FT_LCD_FILTER_H)
#include FT_LCD_FILTER_H
#endif

#if defined(FT_CONFIG_OPTIONS_H)
#include FT_CONFIG_OPTIONS_H
#endif

#if defined(FT_LCD_FILTER_H) && defined(FT_CONFIG_OPTION_SUBPIXEL_RENDERING)
#define QT_USE_FREETYPE_LCDFILTER
#endif

#ifdef QT_LINUXBASE
#include FT_ERRORS_H
#endif

QT_BEGIN_NAMESPACE

/*
 * Freetype 2.1.7 and earlier used width/height
 * for matching sizes in the BDF and PCF loaders.
 * This has been fixed for 2.1.8.
 */
#if (FREETYPE_MAJOR*10000+FREETYPE_MINOR*100+FREETYPE_PATCH) >= 20105
#define X_SIZE(face,i) ((face)->available_sizes[i].x_ppem)
#define Y_SIZE(face,i) ((face)->available_sizes[i].y_ppem)
#else
#define X_SIZE(face,i) ((face)->available_sizes[i].width << 6)
#define Y_SIZE(face,i) ((face)->available_sizes[i].height << 6)
#endif

#define FLOOR(x)    ((x) & -64)
#define CEIL(x)	    (((x)+63) & -64)
#define TRUNC(x)    ((x) >> 6)
#define ROUND(x)    (((x)+32) & -64)

static HB_Error hb_getSFntTable(void *font, HB_Tag tableTag, HB_Byte *buffer, HB_UInt *length)
{
#if (FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100 + FREETYPE_PATCH) > 20103
    FT_Face face = (FT_Face)font;
    FT_ULong ftlen = *length;
    FT_Error error = 0;

    if ( !FT_IS_SFNT(face) )
        return HB_Err_Invalid_Argument;

    error = FT_Load_Sfnt_Table(face, tableTag, 0, buffer, &ftlen);
    *length = ftlen;
    return (HB_Error)error;
#else
    return HB_Err_Invalid_Argument;
#endif
}

// -------------------------- Freetype support ------------------------------

class QtFreetypeData
{
public:
    QtFreetypeData()
        : library(0)
    { }

    FT_Library library;
    QHash<QFontEngine::FaceId, QFreetypeFace *> faces;
};

#ifdef QT_NO_THREAD
Q_GLOBAL_STATIC(QtFreetypeData, theFreetypeData)

QtFreetypeData *qt_getFreetypeData()
{
    return theFreetypeData();
}
#else
Q_GLOBAL_STATIC(QThreadStorage<QtFreetypeData *>, theFreetypeData)

QtFreetypeData *qt_getFreetypeData()
{
    QtFreetypeData *&freetypeData = theFreetypeData()->localData();
    if (!freetypeData)
        freetypeData = new QtFreetypeData;
    return freetypeData;
}
#endif

FT_Library qt_getFreetype()
{
    QtFreetypeData *freetypeData = qt_getFreetypeData();
    if (!freetypeData->library)
        FT_Init_FreeType(&freetypeData->library);
    return freetypeData->library;
}

int QFreetypeFace::fsType() const
{
    int fsType = 0;
    TT_OS2 *os2 = (TT_OS2 *)FT_Get_Sfnt_Table(face, ft_sfnt_os2);
    if (os2)
        fsType = os2->fsType;
    return fsType;
}

HB_Error QFreetypeFace::getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints)
{
    int load_flags = (flags & HB_ShaperFlag_UseDesignMetrics) ? FT_LOAD_NO_HINTING : FT_LOAD_DEFAULT;

    if (HB_Error error = (HB_Error)FT_Load_Glyph(face, glyph, load_flags))
        return error;

    if (face->glyph->format != FT_GLYPH_FORMAT_OUTLINE)
        return HB_Err_Invalid_SubTable;

    *nPoints = face->glyph->outline.n_points;
    if (!(*nPoints))
        return HB_Err_Ok;

    if (point > *nPoints)
        return HB_Err_Invalid_SubTable;

    *xpos = face->glyph->outline.points[point].x;
    *ypos = face->glyph->outline.points[point].y;

    return HB_Err_Ok;
}

/*
 * One font file can contain more than one font (bold/italic for example)
 * find the right one and return it.
 *
 * Returns the freetype face or 0 in case of an empty file or any other problems
 * (like not being able to open the file)
 */
QFreetypeFace *QFreetypeFace::getFace(const QFontEngine::FaceId &face_id)
{
    if (face_id.filename.isEmpty())
        return 0;

    QtFreetypeData *freetypeData = qt_getFreetypeData();
    if (!freetypeData->library)
        FT_Init_FreeType(&freetypeData->library);

    QFreetypeFace *freetype = freetypeData->faces.value(face_id, 0);
    if (freetype) {
        freetype->ref.ref();
    } else {
        QScopedPointer<QFreetypeFace> newFreetype(new QFreetypeFace);
        FT_Face face;
        QFile file(QString::fromUtf8(face_id.filename));
        if (face_id.filename.startsWith(":qmemoryfonts/")) {
            // from qfontdatabase.cpp
            extern QByteArray qt_fontdata_from_index(int);
            QByteArray idx = face_id.filename;
            idx.remove(0, 14); // remove ':qmemoryfonts/'
            bool ok = false;
            newFreetype->fontData = qt_fontdata_from_index(idx.toInt(&ok));
            if (!ok)
                newFreetype->fontData = QByteArray();
        } else if (!(file.fileEngine()->fileFlags(QAbstractFileEngine::FlagsMask) & QAbstractFileEngine::LocalDiskFlag)) {
            if (!file.open(QIODevice::ReadOnly)) {
                return 0;
            }
            newFreetype->fontData = file.readAll();
        }
        if (!newFreetype->fontData.isEmpty()) {
            if (FT_New_Memory_Face(freetypeData->library, (const FT_Byte *)newFreetype->fontData.constData(), newFreetype->fontData.size(), face_id.index, &face)) {
                return 0;
            }
        } else if (FT_New_Face(freetypeData->library, face_id.filename, face_id.index, &face)) {
            return 0;
        }
        newFreetype->face = face;

        newFreetype->hbFace = qHBNewFace(face, hb_getSFntTable);
        Q_CHECK_PTR(newFreetype->hbFace);
        newFreetype->ref = 1;
        newFreetype->xsize = 0;
        newFreetype->ysize = 0;
        newFreetype->matrix.xx = 0x10000;
        newFreetype->matrix.yy = 0x10000;
        newFreetype->matrix.xy = 0;
        newFreetype->matrix.yx = 0;
        newFreetype->unicode_map = 0;
        newFreetype->symbol_map = 0;
#ifndef QT_NO_FONTCONFIG
        newFreetype->charset = 0;
#endif

        memset(newFreetype->cmapCache, 0, sizeof(newFreetype->cmapCache));

        for (int i = 0; i < newFreetype->face->num_charmaps; ++i) {
            FT_CharMap cm = newFreetype->face->charmaps[i];
            switch(cm->encoding) {
            case FT_ENCODING_UNICODE:
                newFreetype->unicode_map = cm;
                break;
            case FT_ENCODING_APPLE_ROMAN:
            case FT_ENCODING_ADOBE_LATIN_1:
                if (!newFreetype->unicode_map || newFreetype->unicode_map->encoding != FT_ENCODING_UNICODE)
                    newFreetype->unicode_map = cm;
                break;
            case FT_ENCODING_ADOBE_CUSTOM:
            case FT_ENCODING_MS_SYMBOL:
                if (!newFreetype->symbol_map)
                    newFreetype->symbol_map = cm;
                break;
            default:
                break;
            }
        }

        if (!FT_IS_SCALABLE(newFreetype->face) && newFreetype->face->num_fixed_sizes == 1)
            FT_Set_Char_Size (face, X_SIZE(newFreetype->face, 0), Y_SIZE(newFreetype->face, 0), 0, 0);
# if 0
        FcChar8 *name;
        FcPatternGetString(pattern, FC_FAMILY, 0, &name);
        qDebug("%s: using maps: default: %x unicode: %x, symbol: %x", name,
               newFreetype->face->charmap ? newFreetype->face->charmap->encoding : 0,
               newFreetype->unicode_map ? newFreetype->unicode_map->encoding : 0,
               newFreetype->symbol_map ? newFreetype->symbol_map->encoding : 0);

        for (int i = 0; i < 256; i += 8)
            qDebug("    %x: %d %d %d %d %d %d %d %d", i,
                   FcCharSetHasChar(newFreetype->charset, i), FcCharSetHasChar(newFreetype->charset, i),
                   FcCharSetHasChar(newFreetype->charset, i), FcCharSetHasChar(newFreetype->charset, i),
                   FcCharSetHasChar(newFreetype->charset, i), FcCharSetHasChar(newFreetype->charset, i),
                   FcCharSetHasChar(newFreetype->charset, i), FcCharSetHasChar(newFreetype->charset, i));
#endif

        FT_Set_Charmap(newFreetype->face, newFreetype->unicode_map);
        QT_TRY {
            freetypeData->faces.insert(face_id, newFreetype.data());
        } QT_CATCH(...) {
            newFreetype.take()->release(face_id);
            // we could return null in principle instead of throwing
            QT_RETHROW;
        }
        freetype = newFreetype.take();
    }
    return freetype;
}

void QFreetypeFace::release(const QFontEngine::FaceId &face_id)
{
    QtFreetypeData *freetypeData = qt_getFreetypeData();
    if (!ref.deref()) {
        qHBFreeFace(hbFace);
        FT_Done_Face(face);
#ifndef QT_NO_FONTCONFIG
        if (charset)
            FcCharSetDestroy(charset);
#endif
        if(freetypeData->faces.contains(face_id))
            freetypeData->faces.take(face_id);
        delete this;
    }
    if (freetypeData->faces.isEmpty()) {
        FT_Done_FreeType(freetypeData->library);
        freetypeData->library = 0;
    }
}


void QFreetypeFace::computeSize(const QFontDef &fontDef, int *xsize, int *ysize, bool *outline_drawing)
{
    *ysize = fontDef.pixelSize << 6;
    *xsize = *ysize * fontDef.stretch / 100;
    *outline_drawing = false;

    /*
     * Bitmap only faces must match exactly, so find the closest
     * one (height dominant search)
     */
    if (!(face->face_flags & FT_FACE_FLAG_SCALABLE)) {
        int best = 0;
        for (int i = 1; i < face->num_fixed_sizes; i++) {
            if (qAbs(*ysize -  Y_SIZE(face,i)) <
                qAbs (*ysize - Y_SIZE(face, best)) ||
                (qAbs (*ysize - Y_SIZE(face, i)) ==
                 qAbs (*ysize - Y_SIZE(face, best)) &&
                 qAbs (*xsize - X_SIZE(face, i)) <
                 qAbs (*xsize - X_SIZE(face, best)))) {
                best = i;
            }
        }
        if (FT_Set_Char_Size (face, X_SIZE(face, best), Y_SIZE(face, best), 0, 0) == 0) {
            *xsize = X_SIZE(face, best);
            *ysize = Y_SIZE(face, best);
        } else {
            int err = 1;
            if (!(face->face_flags & FT_FACE_FLAG_SCALABLE) && ysize == 0 && face->num_fixed_sizes >= 1) {
                // work around FT 2.1.10 problem with BDF without PIXEL_SIZE property
                err = FT_Set_Pixel_Sizes(face, face->available_sizes[0].width, face->available_sizes[0].height);
                if (err && face->num_fixed_sizes == 1)
                    err = 0; //even more of a workaround...
            }

            if (err)
                *xsize = *ysize = 0;
        }
    } else {
        *outline_drawing = (*xsize > (64<<6) || *ysize > (64<<6));
    }
}

QFontEngine::Properties QFreetypeFace::properties() const
{
    QFontEngine::Properties p;
    p.postscriptName = FT_Get_Postscript_Name(face);
    PS_FontInfoRec font_info;
    if (FT_Get_PS_Font_Info(face, &font_info) == 0)
        p.copyright = font_info.notice;
    if (FT_IS_SCALABLE(face)) {
        p.ascent = face->ascender;
        p.descent = -face->descender;
        p.leading = face->height - face->ascender + face->descender;
        p.emSquare = face->units_per_EM;
        p.boundingBox = QRectF(face->bbox.xMin, -face->bbox.yMax,
                               face->bbox.xMax - face->bbox.xMin,
                               face->bbox.yMax - face->bbox.yMin);
    } else {
        p.ascent = QFixed::fromFixed(face->size->metrics.ascender);
        p.descent = QFixed::fromFixed(-face->size->metrics.descender);
        p.leading = QFixed::fromFixed(face->size->metrics.height - face->size->metrics.ascender + face->size->metrics.descender);
        p.emSquare = face->size->metrics.y_ppem;
        p.boundingBox = QRectF(-p.ascent.toReal(), 0, (p.ascent + p.descent).toReal(), face->size->metrics.max_advance/64.);
    }
    p.italicAngle = 0;
    p.capHeight = p.ascent;
    p.lineWidth = face->underline_thickness;
    return p;
}

bool QFreetypeFace::getSfntTable(uint tag, uchar *buffer, uint *length) const
{
    bool result = false;
#if (FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100 + FREETYPE_PATCH) > 20103
    if (FT_IS_SFNT(face)) {
        FT_ULong len = *length;
        result = FT_Load_Sfnt_Table(face, tag, 0, buffer, &len) == FT_Err_Ok;
        *length = len;
    }
#endif
    return result;
}

/* Some fonts (such as MingLiu rely on hinting to scale different
   components to their correct sizes. While this is really broken (it
   should be done in the component glyph itself, not the hinter) we
   will have to live with it.

   This means we can not use FT_LOAD_NO_HINTING to get the glyph
   outline. All we can do is to load the unscaled glyph and scale it
   down manually when required.
*/
static void scaleOutline(FT_Face face, FT_GlyphSlot g, FT_Fixed x_scale, FT_Fixed y_scale)
{
    x_scale = FT_MulDiv(x_scale, 1 << 10, face->units_per_EM);
    y_scale = FT_MulDiv(y_scale, 1 << 10, face->units_per_EM);
    FT_Vector *p = g->outline.points;
    const FT_Vector *e = p + g->outline.n_points;
    while (p < e) {
        p->x = FT_MulFix(p->x, x_scale);
        p->y = FT_MulFix(p->y, y_scale);
        ++p;
    }
}

void QFreetypeFace::addGlyphToPath(FT_Face face, FT_GlyphSlot g, const QFixedPoint &point, QPainterPath *path, FT_Fixed x_scale, FT_Fixed y_scale)
{
    const qreal factor = 1/64.;
    scaleOutline(face, g, x_scale, y_scale);

    QPointF cp = point.toPointF();

    // convert the outline to a painter path
    int i = 0;
    for (int j = 0; j < g->outline.n_contours; ++j) {
        int last_point = g->outline.contours[j];
        QPointF start = cp + QPointF(g->outline.points[i].x*factor, -g->outline.points[i].y*factor);
        if(!(g->outline.tags[i] & 1)) {
            start += cp + QPointF(g->outline.points[last_point].x*factor, -g->outline.points[last_point].y*factor);
            start /= 2;
        }
//         qDebug("contour: %d -- %d", i, g->outline.contours[j]);
//         qDebug("first point at %f %f", start.x(), start.y());
        path->moveTo(start);

        QPointF c[4];
        c[0] = start;
        int n = 1;
        while (i < last_point) {
            ++i;
            c[n] = cp + QPointF(g->outline.points[i].x*factor, -g->outline.points[i].y*factor);
//             qDebug() << "    i=" << i << " flag=" << (int)g->outline.tags[i] << "point=" << c[n];
            ++n;
            switch (g->outline.tags[i] & 3) {
            case 2:
                // cubic bezier element
                if (n < 4)
                    continue;
                c[3] = (c[3] + c[2])/2;
                --i;
                break;
            case 0:
                // quadratic bezier element
                if (n < 3)
                    continue;
                c[3] = (c[1] + c[2])/2;
                c[2] = (2*c[1] + c[3])/3;
                c[1] = (2*c[1] + c[0])/3;
                --i;
                break;
            case 1:
            case 3:
                if (n == 2) {
//                     qDebug() << "lineTo" << c[1];
                    path->lineTo(c[1]);
                    c[0] = c[1];
                    n = 1;
                    continue;
                } else if (n == 3) {
                    c[3] = c[2];
                    c[2] = (2*c[1] + c[3])/3;
                    c[1] = (2*c[1] + c[0])/3;
                }
                break;
            }
//             qDebug() << "cubicTo" << c[1] << c[2] << c[3];
            path->cubicTo(c[1], c[2], c[3]);
            c[0] = c[3];
            n = 1;
        }
        if (n == 1) {
//             qDebug() << "closeSubpath";
            path->closeSubpath();
        } else {
            c[3] = start;
            if (n == 2) {
                c[2] = (2*c[1] + c[3])/3;
                c[1] = (2*c[1] + c[0])/3;
            }
//             qDebug() << "cubicTo" << c[1] << c[2] << c[3];
            path->cubicTo(c[1], c[2], c[3]);
        }
        ++i;
    }
}

extern void qt_addBitmapToPath(qreal x0, qreal y0, const uchar *image_data, int bpl, int w, int h, QPainterPath *path);

void QFreetypeFace::addBitmapToPath(FT_GlyphSlot slot, const QFixedPoint &point, QPainterPath *path, bool)
{
    if (slot->format != FT_GLYPH_FORMAT_BITMAP
        || slot->bitmap.pixel_mode != FT_PIXEL_MODE_MONO)
        return;

    QPointF cp = point.toPointF();
    qt_addBitmapToPath(cp.x() + TRUNC(slot->metrics.horiBearingX), cp.y() - TRUNC(slot->metrics.horiBearingY),
                       slot->bitmap.buffer, slot->bitmap.pitch, slot->bitmap.width, slot->bitmap.rows, path);
}

QFontEngineFT::Glyph::~Glyph()
{
    delete [] data;
}

static const uint subpixel_filter[3][3] = {
    { 180, 60, 16 },
    { 38, 180, 38 },
    { 16, 60, 180 }
};

static inline uint filterPixel(uint red, uint green, uint blue, bool legacyFilter)
{
    uint res;
    if (legacyFilter) {
        uint high = (red*subpixel_filter[0][0] + green*subpixel_filter[0][1] + blue*subpixel_filter[0][2]) >> 8;
        uint mid = (red*subpixel_filter[1][0] + green*subpixel_filter[1][1] + blue*subpixel_filter[1][2]) >> 8;
        uint low = (red*subpixel_filter[2][0] + green*subpixel_filter[2][1] + blue*subpixel_filter[2][2]) >> 8;
        res = (mid << 24) + (high << 16) + (mid << 8) + low;
    } else {
        uint alpha = green;
        res = (alpha << 24) + (red << 16) + (green << 8) + blue;
    }
    return res;
}

static void convertRGBToARGB(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
{
    int h = height;
    const int offs = bgr ? -1 : 1;
    const int w = width * 3;
    while (h--) {
        uint *dd = dst;
        for (int x = 0; x < w; x += 3) {
            uint red = src[x+1-offs];
            uint green = src[x+1];
            uint blue = src[x+1+offs];
            *dd = filterPixel(red, green, blue, legacyFilter);
            ++dd;
        }
        dst += width;
        src += src_pitch;
    }
}

static void convertRGBToARGB_V(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
{
    int h = height;
    const int offs = bgr ? -src_pitch : src_pitch;
    while (h--) {
        for (int x = 0; x < width; x++) {
            uint red = src[x+src_pitch-offs];
            uint green = src[x+src_pitch];
            uint blue = src[x+src_pitch+offs];
            dst[x] = filterPixel(red, green, blue, legacyFilter);
        }
        dst += width;
        src += 3*src_pitch;
    }
}

static void convoluteBitmap(const uchar *src, uchar *dst, int width, int height, int pitch)
{
    // convolute the bitmap with a triangle filter to get rid of color fringes
    // If we take account for a gamma value of 2, we end up with
    // weights of 1, 4, 9, 4, 1. We use an approximation of 1, 3, 8, 3, 1 here,
    // as this nicely sums up to 16 :)
    int h = height;
    while (h--) {
        dst[0] = dst[1] = 0;
        //
        for (int x = 2; x < width - 2; ++x) {
            uint sum = src[x-2] + 3*src[x-1] + 8*src[x] + 3*src[x+1] + src[x+2];
            dst[x] = (uchar) (sum >> 4);
        }
        dst[width - 2] = dst[width - 1] = 0;
        src += pitch;
        dst += pitch;
    }
}

QFontEngineFT::QFontEngineFT(const QFontDef &fd)
{
    fontDef = fd;
    matrix.xx = 0x10000;
    matrix.yy = 0x10000;
    matrix.xy = 0;
    matrix.yx = 0;
    cache_cost = 100;
    kerning_pairs_loaded = false;
    transform = false;
    antialias = true;
    freetype = 0;
    default_load_flags = 0;
    default_hint_style = HintNone;
    subpixelType = Subpixel_None;
    lcdFilterType = 0;
#if defined(FT_LCD_FILTER_H)
    lcdFilterType = (int)((quintptr) FT_LCD_FILTER_DEFAULT);
#endif
    defaultFormat = Format_None;
    canUploadGlyphsToServer = false;
    embeddedbitmap = false;
}

QFontEngineFT::~QFontEngineFT()
{
    if (freetype)
        freetype->release(face_id);
    hbFace = 0; // we share the face in QFreeTypeFace, don't let ~QFontEngine delete it
}

void QFontEngineFT::freeGlyphSets()
{
    freeServerGlyphSet(defaultGlyphSet.id);
    for (int i = 0; i < transformedGlyphSets.count(); ++i)
        freeServerGlyphSet(transformedGlyphSets.at(i).id);
}

bool QFontEngineFT::init(FaceId faceId, bool antialias, GlyphFormat format)
{
    defaultFormat = format;
    this->antialias = antialias;

    if (!antialias)
        glyphFormat = QFontEngineGlyphCache::Raster_Mono;
    else if (format == Format_A8)
        glyphFormat = QFontEngineGlyphCache::Raster_A8;
    else if (format == Format_A32)
        glyphFormat = QFontEngineGlyphCache::Raster_RGBMask;

    face_id = faceId;
    freetype = QFreetypeFace::getFace(face_id);
    if (!freetype) {
        xsize = 0;
        ysize = 0;
        return false;
    }

    symbol = freetype->symbol_map != 0;
    PS_FontInfoRec psrec;
    // don't assume that type1 fonts are symbol fonts by default
    if (FT_Get_PS_Font_Info(freetype->face, &psrec) == FT_Err_Ok) {
        symbol = bool(fontDef.family.contains(QLatin1String("symbol"), Qt::CaseInsensitive));
    }
    // #####
    freetype->hbFace->isSymbolFont = symbol;

    lbearing = rbearing = SHRT_MIN;
    freetype->computeSize(fontDef, &xsize, &ysize, &defaultGlyphSet.outline_drawing);

    FT_Face face = lockFace();

    //underline metrics
    if (FT_IS_SCALABLE(face)) {
        line_thickness =  QFixed::fromFixed(FT_MulFix(face->underline_thickness, face->size->metrics.y_scale));
        underline_position = QFixed::fromFixed(-FT_MulFix(face->underline_position, face->size->metrics.y_scale));
        bool fake_oblique = (fontDef.style != QFont::StyleNormal) && !(face->style_flags & FT_STYLE_FLAG_ITALIC);
        if (fake_oblique)
            matrix.xy = 0x10000*3/10;
        FT_Set_Transform(face, &matrix, 0);
        freetype->matrix = matrix;
        if (fake_oblique)
            transform = true;
    } else {
        // copied from QFontEngineQPF
        // ad hoc algorithm
        int score = fontDef.weight * fontDef.pixelSize;
        line_thickness = score / 700;
        // looks better with thicker line for small pointsizes
        if (line_thickness < 2 && score >= 1050)
            line_thickness = 2;
        underline_position =  ((line_thickness * 2) + 3) / 6;
    }
    if (line_thickness < 1)
        line_thickness = 1;

    hbFont.x_ppem  = face->size->metrics.x_ppem;
    hbFont.y_ppem  = face->size->metrics.y_ppem;
    hbFont.x_scale = face->size->metrics.x_scale;
    hbFont.y_scale = face->size->metrics.y_scale;

    hbFace = freetype->hbFace;

    metrics = face->size->metrics;
#if defined(Q_WS_QWS)
    /*
       TrueType fonts with embedded bitmaps may have a bitmap font specific
       ascent/descent in the EBLC table. There is no direct public API
       to extract those values. The only way we've found is to trick freetype
       into thinking that it's not a scalable font in FT_SelectSize so that
       the metrics are retrieved from the bitmap strikes.
    */
    if (FT_IS_SCALABLE(face)) {
        for (int i = 0; i < face->num_fixed_sizes; ++i) {
            if (xsize == X_SIZE(face, i) && ysize == Y_SIZE(face, i)) {
                face->face_flags &= ~FT_FACE_FLAG_SCALABLE;

                FT_Select_Size(face, i);
                metrics.ascender = face->size->metrics.ascender;
                metrics.descender = face->size->metrics.descender;
                FT_Set_Char_Size(face, xsize, ysize, 0, 0);

                face->face_flags |= FT_FACE_FLAG_SCALABLE;
                break;
            }
        }
    }
#endif

    unlockFace();

    fsType = freetype->fsType();
    defaultGlyphSet.id = allocateServerGlyphSet();
    return true;
}

QFontEngineFT::Glyph *QFontEngineFT::loadGlyphMetrics(QGlyphSet *set, uint glyph) const
{
    Glyph *g = set->glyph_data.value(glyph);
    if (g)
        return g;

    int load_flags = FT_LOAD_DEFAULT | default_load_flags;
    if (set->outline_drawing)
        load_flags = FT_LOAD_NO_BITMAP;

    // apply our matrix to this, but note that the metrics will not be affected by this.
    FT_Matrix matrix = freetype->matrix;
    FT_Face face = lockFace();
    matrix = this->matrix;
    FT_Matrix_Multiply(&set->transformationMatrix, &matrix);
    FT_Set_Transform(face, &matrix, 0);
    freetype->matrix = matrix;

    bool transform = matrix.xx != 0x10000 || matrix.yy != 0x10000 || matrix.xy != 0 || matrix.yx != 0;
    if (transform)
        load_flags |= FT_LOAD_NO_BITMAP;

    FT_Error err = FT_Load_Glyph(face, glyph, load_flags);
    if (err && (load_flags & FT_LOAD_NO_BITMAP)) {
        load_flags &= ~FT_LOAD_NO_BITMAP;
        err = FT_Load_Glyph(face, glyph, load_flags);
    }
    if (err == FT_Err_Too_Few_Arguments) {
        // this is an error in the bytecode interpreter, just try to run without it
        load_flags |= FT_LOAD_FORCE_AUTOHINT;
        err = FT_Load_Glyph(face, glyph, load_flags);
    }
    if (err != FT_Err_Ok)
        qWarning("load glyph failed err=%x face=%p, glyph=%d", err, face, glyph);

    unlockFace();
    if (set->outline_drawing)
        return 0;

    if (!g) {
        g = new Glyph;
        g->uploadedToServer = false;
        g->data = 0;
    }

    FT_GlyphSlot slot = face->glyph;
    int left  = slot->metrics.horiBearingX;
    int right = slot->metrics.horiBearingX + slot->metrics.width;
    int top    = slot->metrics.horiBearingY;
    int bottom = slot->metrics.horiBearingY - slot->metrics.height;
    if(transform && slot->format != FT_GLYPH_FORMAT_BITMAP) { // freetype doesn't apply the transformation on the metrics
        int l, r, t, b;
        FT_Vector vector;
        vector.x = left;
        vector.y = top;
        FT_Vector_Transform(&vector, &matrix);
        l = r = vector.x;
        t = b = vector.y;
        vector.x = right;
        vector.y = top;
        FT_Vector_Transform(&vector, &matrix);
        if (l > vector.x) l = vector.x;
        if (r < vector.x) r = vector.x;
        if (t < vector.y) t = vector.y;
        if (b > vector.y) b = vector.y;
        vector.x = right;
        vector.y = bottom;
        FT_Vector_Transform(&vector, &matrix);
        if (l > vector.x) l = vector.x;
        if (r < vector.x) r = vector.x;
        if (t < vector.y) t = vector.y;
        if (b > vector.y) b = vector.y;
        vector.x = left;
        vector.y = bottom;
        FT_Vector_Transform(&vector, &matrix);
        if (l > vector.x) l = vector.x;
        if (r < vector.x) r = vector.x;
        if (t < vector.y) t = vector.y;
        if (b > vector.y) b = vector.y;
        left = l;
        right = r;
        top = t;
        bottom = b;
    }
    left = FLOOR(left);
    right = CEIL(right);
    bottom = FLOOR(bottom);
    top = CEIL(top);

    g->linearAdvance = face->glyph->linearHoriAdvance >> 10;
    g->width = TRUNC(right-left);
    g->height = TRUNC(top-bottom);
    g->x = TRUNC(left);
    g->y = TRUNC(top);
    g->advance = TRUNC(ROUND(face->glyph->advance.x));
    g->format = Format_None;

    return g;
}

QFontEngineFT::Glyph *QFontEngineFT::loadGlyph(QGlyphSet *set, uint glyph, GlyphFormat format, bool fetchMetricsOnly) const
{
//     Q_ASSERT(freetype->lock == 1);

    bool uploadToServer = false;
    if (format == Format_None) {
        if (defaultFormat != Format_None) {
            format = defaultFormat;
            if (canUploadGlyphsToServer)
                uploadToServer = true;
        } else {
            format = Format_Mono;
        }
    }

    Glyph *g = set->glyph_data.value(glyph);
    if (g && g->format == format) {
        if (uploadToServer && !g->uploadedToServer) {
            set->glyph_data[glyph] = 0;
            delete g;
            g = 0;
        } else {
            return g;
        }
    }

    QFontEngineFT::GlyphInfo info;

    Q_ASSERT(format != Format_None);
    bool hsubpixel = false;
    int vfactor = 1;
    int load_flags = FT_LOAD_DEFAULT | default_load_flags;

    int load_target = default_hint_style == HintLight
                      ? FT_LOAD_TARGET_LIGHT
                      : FT_LOAD_TARGET_NORMAL;

    if (set->outline_drawing)
        load_flags |= FT_LOAD_NO_BITMAP;

    if (format == Format_Mono) {
        load_target = FT_LOAD_TARGET_MONO;
    } else if (format == Format_A32) {
        if (subpixelType == QFontEngineFT::Subpixel_RGB || subpixelType == QFontEngineFT::Subpixel_BGR) {
            if (default_hint_style == HintFull)
                load_target = FT_LOAD_TARGET_LCD;
            hsubpixel = true;
        } else if (subpixelType == QFontEngineFT::Subpixel_VRGB || subpixelType == QFontEngineFT::Subpixel_VBGR) {
            if (default_hint_style == HintFull)
                load_target = FT_LOAD_TARGET_LCD_V;
            vfactor = 3;
        }
    }

    if (default_hint_style == HintNone)
        load_flags |= FT_LOAD_NO_HINTING;
    else
        load_flags |= load_target;

#ifndef Q_WS_QWS
    if (format != Format_Mono && !embeddedbitmap)
        load_flags |= FT_LOAD_NO_BITMAP;
#endif

    FT_Matrix matrix = freetype->matrix;
    bool transform = matrix.xx != 0x10000
                     || matrix.yy != 0x10000
                     || matrix.xy != 0
                     || matrix.yx != 0;

    if (transform)
        load_flags |= FT_LOAD_NO_BITMAP;

    FT_Face face = freetype->face;
    FT_Error err = FT_Load_Glyph(face, glyph, load_flags);
    if (err && (load_flags & FT_LOAD_NO_BITMAP)) {
        load_flags &= ~FT_LOAD_NO_BITMAP;
        err = FT_Load_Glyph(face, glyph, load_flags);
    }
    if (err == FT_Err_Too_Few_Arguments) {
        // this is an error in the bytecode interpreter, just try to run without it
        load_flags |= FT_LOAD_FORCE_AUTOHINT;
        err = FT_Load_Glyph(face, glyph, load_flags);
    }
    if (err != FT_Err_Ok)
        qWarning("load glyph failed err=%x face=%p, glyph=%d", err, face, glyph);

    if (set->outline_drawing && fetchMetricsOnly)
        return 0;

    FT_GlyphSlot slot = face->glyph;
    FT_Library library = qt_getFreetype();

    info.xOff = TRUNC(ROUND(slot->advance.x));
    info.yOff = 0;

    uchar *glyph_buffer = 0;
    int glyph_buffer_size = 0;
#if defined(QT_USE_FREETYPE_LCDFILTER)
    bool useFreetypeRenderGlyph = false;
    if (slot->format == FT_GLYPH_FORMAT_OUTLINE && (hsubpixel || vfactor != 1)) {
        err = FT_Library_SetLcdFilter(library, (FT_LcdFilter)lcdFilterType);
        if (err == FT_Err_Ok)
            useFreetypeRenderGlyph = true;
    }

    if (useFreetypeRenderGlyph) {
        err = FT_Render_Glyph(slot, hsubpixel ? FT_RENDER_MODE_LCD : FT_RENDER_MODE_LCD_V);

        if (err != FT_Err_Ok)
            qWarning("render glyph failed err=%x face=%p, glyph=%d", err, face, glyph);

        FT_Library_SetLcdFilter(library, FT_LCD_FILTER_NONE);

        info.height = slot->bitmap.rows / vfactor;
        info.width = hsubpixel ? slot->bitmap.width / 3 : slot->bitmap.width;
        info.x = -slot->bitmap_left;
        info.y = slot->bitmap_top;

        glyph_buffer_size = info.width * info.height * 4;
        glyph_buffer = new uchar[glyph_buffer_size];

        if (hsubpixel)
            convertRGBToARGB(slot->bitmap.buffer, (uint *)glyph_buffer, info.width, info.height, slot->bitmap.pitch, subpixelType != QFontEngineFT::Subpixel_RGB, false);
        else if (vfactor != 1)
            convertRGBToARGB_V(slot->bitmap.buffer, (uint *)glyph_buffer, info.width, info.height, slot->bitmap.pitch, subpixelType != QFontEngineFT::Subpixel_VRGB, false);
    } else
#endif
    {
    int left  = slot->metrics.horiBearingX;
    int right = slot->metrics.horiBearingX + slot->metrics.width;
    int top    = slot->metrics.horiBearingY;
    int bottom = slot->metrics.horiBearingY - slot->metrics.height;
    if(transform && slot->format != FT_GLYPH_FORMAT_BITMAP) {
        int l, r, t, b;
        FT_Vector vector;
        vector.x = left;
        vector.y = top;
        FT_Vector_Transform(&vector, &matrix);
        l = r = vector.x;
        t = b = vector.y;
        vector.x = right;
        vector.y = top;
        FT_Vector_Transform(&vector, &matrix);
        if (l > vector.x) l = vector.x;
        if (r < vector.x) r = vector.x;
        if (t < vector.y) t = vector.y;
        if (b > vector.y) b = vector.y;
        vector.x = right;
        vector.y = bottom;
        FT_Vector_Transform(&vector, &matrix);
        if (l > vector.x) l = vector.x;
        if (r < vector.x) r = vector.x;
        if (t < vector.y) t = vector.y;
        if (b > vector.y) b = vector.y;
        vector.x = left;
        vector.y = bottom;
        FT_Vector_Transform(&vector, &matrix);
        if (l > vector.x) l = vector.x;
        if (r < vector.x) r = vector.x;
        if (t < vector.y) t = vector.y;
        if (b > vector.y) b = vector.y;
        left = l;
        right = r;
        top = t;
        bottom = b;
    }
    left = FLOOR(left);
    right = CEIL(right);
    bottom = FLOOR(bottom);
    top = CEIL(top);

    int hpixels = TRUNC(right - left);
    if (hsubpixel)
        hpixels = hpixels*3 + 8;
    info.width = hpixels;
    info.height = TRUNC(top - bottom);
    info.x = -TRUNC(left);
    info.y = TRUNC(top);
    if (hsubpixel) {
        info.width /= 3;
        info.x += 1;
    }

    bool large_glyph = (((short)(slot->linearHoriAdvance>>10) != slot->linearHoriAdvance>>10)
                        || ((uchar)(info.width) != info.width)
                        || ((uchar)(info.height) != info.height)
                        || ((signed char)(info.x) != info.x)
                        || ((signed char)(info.y) != info.y)
                        || ((signed char)(info.xOff) != info.xOff));

    if (large_glyph) {
        delete [] glyph_buffer;
        return 0;
    }

    int pitch = (format == Format_Mono ? ((info.width + 31) & ~31) >> 3 :
                 (format == Format_A8 ? (info.width + 3) & ~3 : info.width * 4));
    glyph_buffer_size = pitch * info.height;
    glyph_buffer = new uchar[glyph_buffer_size];

    if (slot->format == FT_GLYPH_FORMAT_OUTLINE) {
        FT_Bitmap bitmap;
        bitmap.rows = info.height*vfactor;
        bitmap.width = hpixels;
        bitmap.pitch = format == Format_Mono ? (((info.width + 31) & ~31) >> 3) : ((bitmap.width + 3) & ~3);
        if (!hsubpixel && vfactor == 1)
            bitmap.buffer = glyph_buffer;
        else
            bitmap.buffer = new uchar[bitmap.rows*bitmap.pitch];
        memset(bitmap.buffer, 0, bitmap.rows*bitmap.pitch);
        bitmap.pixel_mode = format == Format_Mono ? FT_PIXEL_MODE_MONO : FT_PIXEL_MODE_GRAY;
        FT_Matrix matrix;
        matrix.xx = (hsubpixel ? 3 : 1) << 16;
        matrix.yy = vfactor << 16;
        matrix.yx = matrix.xy = 0;

        FT_Outline_Transform(&slot->outline, &matrix);
        FT_Outline_Translate (&slot->outline, (hsubpixel ? -3*left +(4<<6) : -left), -bottom*vfactor);
        FT_Outline_Get_Bitmap(library, &slot->outline, &bitmap);
        if (hsubpixel) {
            Q_ASSERT (bitmap.pixel_mode == FT_PIXEL_MODE_GRAY);
            Q_ASSERT(antialias);
            uchar *convoluted = new uchar[bitmap.rows*bitmap.pitch];
            bool useLegacyLcdFilter = false;
#if defined(FC_LCD_FILTER) && defined(FT_LCD_FILTER_H)
            useLegacyLcdFilter = (lcdFilterType == FT_LCD_FILTER_LEGACY);
#endif
            uchar *buffer = bitmap.buffer;
            if (!useLegacyLcdFilter) {
                convoluteBitmap(bitmap.buffer, convoluted, bitmap.width, info.height, bitmap.pitch);
                buffer = convoluted;
            }
            convertRGBToARGB(buffer + 1, (uint *)glyph_buffer, info.width, info.height, bitmap.pitch, subpixelType != QFontEngineFT::Subpixel_RGB, useLegacyLcdFilter);
            delete [] convoluted;
        } else if (vfactor != 1) {
            convertRGBToARGB_V(bitmap.buffer, (uint *)glyph_buffer, info.width, info.height, bitmap.pitch, subpixelType != QFontEngineFT::Subpixel_VRGB, true);
        }

        if (bitmap.buffer != glyph_buffer)
            delete [] bitmap.buffer;
    } else if (slot->format == FT_GLYPH_FORMAT_BITMAP) {
        Q_ASSERT(slot->bitmap.pixel_mode == FT_PIXEL_MODE_MONO);
        uchar *src = slot->bitmap.buffer;
        uchar *dst = glyph_buffer;
        int h = slot->bitmap.rows;
        if (format == Format_Mono) {
            int bytes = ((info.width + 7) & ~7) >> 3;
            while (h--) {
                memcpy (dst, src, bytes);
                dst += pitch;
                src += slot->bitmap.pitch;
            }
        } else {
            if (hsubpixel) {
                while (h--) {
                    uint *dd = (uint *)dst;
                    *dd++ = 0;
                    for (int x = 0; x < slot->bitmap.width; x++) {
                        uint a = ((src[x >> 3] & (0x80 >> (x & 7))) ? 0xffffff : 0x000000);
                        *dd++ = a;
                    }
                    *dd++ = 0;
                    dst += pitch;
                    src += slot->bitmap.pitch;
                }
            } else if (vfactor != 1) {
                while (h--) {
                    uint *dd = (uint *)dst;
                    for (int x = 0; x < slot->bitmap.width; x++) {
                        uint a = ((src[x >> 3] & (0x80 >> (x & 7))) ? 0xffffff : 0x000000);
                        *dd++ = a;
                    }
                    dst += pitch;
                    src += slot->bitmap.pitch;
                }
            } else {
                while (h--) {
                    for (int x = 0; x < slot->bitmap.width; x++) {
                        unsigned char a = ((src[x >> 3] & (0x80 >> (x & 7))) ? 0xff : 0x00);
                        dst[x] = a;
                    }
                    dst += pitch;
                    src += slot->bitmap.pitch;
                }
            }
        }
    } else {
        qWarning("QFontEngine: Glyph neither outline nor bitmap format=%d", slot->format);
        delete [] glyph_buffer;
        return 0;
    }
    }


    if (!g) {
        g = new Glyph;
        g->uploadedToServer = false;
        g->data = 0;
    }

    g->linearAdvance = slot->linearHoriAdvance >> 10;
    g->width = info.width;
    g->height = info.height;
    g->x = -info.x;
    g->y = info.y;
    g->advance = info.xOff;
    g->format = format;
    delete [] g->data;
    g->data = glyph_buffer;

    if (uploadToServer) {
        uploadGlyphToServer(set, glyph, g, &info, glyph_buffer_size);
    }

    set->glyph_data[glyph] = g;

    return g;
}

bool QFontEngineFT::uploadGlyphToServer(QGlyphSet *set, uint glyphid, Glyph *g, GlyphInfo *info, int glyphDataSize) const
{
    Q_UNUSED(set);
    Q_UNUSED(glyphid);
    Q_UNUSED(g);
    Q_UNUSED(info);
    Q_UNUSED(glyphDataSize);
    return false;
}

QFontEngine::FaceId QFontEngineFT::faceId() const
{
    return face_id;
}

QFontEngine::Properties QFontEngineFT::properties() const
{
    Properties p = freetype->properties();
    if (p.postscriptName.isEmpty()) {
        p.postscriptName = fontDef.family.toUtf8();
#ifndef QT_NO_PRINTER
        p.postscriptName = QPdf::stripSpecialCharacters(p.postscriptName);
#endif
    }

    return freetype->properties();
}

QFixed QFontEngineFT::emSquareSize() const
{
    if (FT_IS_SCALABLE(freetype->face))
        return freetype->face->units_per_EM;
    else
        return freetype->face->size->metrics.y_ppem;
}

bool QFontEngineFT::getSfntTableData(uint tag, uchar *buffer, uint *length) const
{
    return freetype->getSfntTable(tag, buffer, length);
}

int QFontEngineFT::synthesized() const
{
    int s = 0;
    if ((fontDef.style != QFont::StyleNormal) && !(freetype->face->style_flags & FT_STYLE_FLAG_ITALIC))
        s = SynthesizedItalic;
    if (fontDef.stretch != 100 && FT_IS_SCALABLE(freetype->face))
        s |= SynthesizedStretch;
    return s;
}

QFixed QFontEngineFT::ascent() const
{
    return QFixed::fromFixed(metrics.ascender);
}

QFixed QFontEngineFT::descent() const
{
    return QFixed::fromFixed(-metrics.descender);
}

QFixed QFontEngineFT::leading() const
{
    return QFixed::fromFixed(metrics.height - metrics.ascender + metrics.descender);
}

QFixed QFontEngineFT::xHeight() const
{
    TT_OS2 *os2 = (TT_OS2 *)FT_Get_Sfnt_Table(freetype->face, ft_sfnt_os2);
    if (os2 && os2->sxHeight) {
        lockFace();
        QFixed answer = QFixed(os2->sxHeight*freetype->face->size->metrics.y_ppem)/freetype->face->units_per_EM;
        unlockFace();
        return answer;
    }
    return QFontEngine::xHeight();
}

QFixed QFontEngineFT::averageCharWidth() const
{
    TT_OS2 *os2 = (TT_OS2 *)FT_Get_Sfnt_Table(freetype->face, ft_sfnt_os2);
    if (os2 && os2->xAvgCharWidth) {
        lockFace();
        QFixed answer = QFixed(os2->xAvgCharWidth*freetype->face->size->metrics.x_ppem)/freetype->face->units_per_EM;
        unlockFace();
        return answer;
    }
    return QFontEngine::averageCharWidth();
}

qreal QFontEngineFT::maxCharWidth() const
{
    return metrics.max_advance >> 6;
}

static const ushort char_table[] = {
        40,
        67,
        70,
        75,
        86,
        88,
        89,
        91,
        102,
        114,
        124,
        127,
        205,
        645,
        884,
        922,
        1070,
        12386
};

static const int char_table_entries = sizeof(char_table)/sizeof(ushort);


qreal QFontEngineFT::minLeftBearing() const
{
    if (lbearing == SHRT_MIN)
        (void) minRightBearing(); // calculates both
    return lbearing.toReal();
}

qreal QFontEngineFT::minRightBearing() const
{
    if (rbearing == SHRT_MIN) {
        lbearing = rbearing = 0;
        const QChar *ch = (const QChar *)(const void*)char_table;
        QGlyphLayoutArray<char_table_entries> glyphs;
        int ng = char_table_entries;
        stringToCMap(ch, char_table_entries, &glyphs, &ng, QTextEngine::GlyphIndicesOnly);
        while (--ng) {
            if (glyphs.glyphs[ng]) {
                glyph_metrics_t gi = const_cast<QFontEngineFT *>(this)->boundingBox(glyphs.glyphs[ng]);
                lbearing = qMin(lbearing, gi.x);
                rbearing = qMin(rbearing, (gi.xoff - gi.x - gi.width));
            }
        }
    }
    return rbearing.toReal();
}

QFixed QFontEngineFT::lineThickness() const
{
    return line_thickness;
}

QFixed QFontEngineFT::underlinePosition() const
{
    return underline_position;
}

void QFontEngineFT::doKerning(QGlyphLayout *g, QTextEngine::ShaperFlags flags) const
{
    if (!kerning_pairs_loaded) {
        kerning_pairs_loaded = true;
        lockFace();
        if (freetype->face->size->metrics.x_ppem != 0) {
            QFixed scalingFactor(freetype->face->units_per_EM/freetype->face->size->metrics.x_ppem);
            unlockFace();
            const_cast<QFontEngineFT *>(this)->loadKerningPairs(scalingFactor);
        } else {
            unlockFace();
        }
    }
    QFontEngine::doKerning(g, flags);
}

QFontEngineFT::QGlyphSet *QFontEngineFT::loadTransformedGlyphSet(const QTransform &matrix)
{
    if (matrix.type() > QTransform::TxShear)
        return 0;

    // FT_Set_Transform only supports scalable fonts
    if (!FT_IS_SCALABLE(freetype->face))
        return 0;

    FT_Matrix m;
    m.xx = FT_Fixed(matrix.m11() * 65536);
    m.xy = FT_Fixed(-matrix.m21() * 65536);
    m.yx = FT_Fixed(-matrix.m12() * 65536);
    m.yy = FT_Fixed(matrix.m22() * 65536);

    QGlyphSet *gs = 0;

    for (int i = 0; i < transformedGlyphSets.count(); ++i) {
        const QGlyphSet &g = transformedGlyphSets.at(i);
        if (g.transformationMatrix.xx == m.xx
            && g.transformationMatrix.xy == m.xy
            && g.transformationMatrix.yx == m.yx
            && g.transformationMatrix.yy == m.yy) {

            // found a match, move it to the front
            transformedGlyphSets.move(i, 0);
            gs = &transformedGlyphSets[0];
            break;
        }
    }

    if (!gs) {
        // don't try to load huge fonts
        bool draw_as_outline = fontDef.pixelSize * qSqrt(matrix.det()) >= 64;
        if (draw_as_outline)
            return 0;

        // don't cache more than 10 transformations
        if (transformedGlyphSets.count() >= 10) {
            transformedGlyphSets.move(transformedGlyphSets.size() - 1, 0);
            freeServerGlyphSet(transformedGlyphSets.at(0).id);
        } else {
            transformedGlyphSets.prepend(QGlyphSet());
        }
        gs = &transformedGlyphSets[0];

        qDeleteAll(gs->glyph_data);
        gs->glyph_data.clear();

        gs->id = allocateServerGlyphSet();

        gs->transformationMatrix = m;
        gs->outline_drawing = draw_as_outline;
    }

    return gs;
}

bool QFontEngineFT::loadGlyphs(QGlyphSet *gs, glyph_t *glyphs, int num_glyphs, GlyphFormat format)
{
    FT_Face face = 0;

    for (int i = 0; i < num_glyphs; ++i) {
        Glyph *glyph = gs->glyph_data.value(glyphs[i]);
        if (glyph == 0 || glyph->format != format) {
            if (!face) {
                face = lockFace();
                FT_Matrix m = matrix;
                FT_Matrix_Multiply(&gs->transformationMatrix, &m);
                FT_Set_Transform(face, &m, 0);
                freetype->matrix = m;
            }
            if (!loadGlyph(gs, glyphs[i], format)) {
                unlockFace();
                return false;
            }
        }
    }

    if (face)
        unlockFace();

    return true;
}

void QFontEngineFT::getUnscaledGlyph(glyph_t glyph, QPainterPath *path, glyph_metrics_t *metrics)
{
    FT_Face face = lockFace(Unscaled);
    FT_Set_Transform(face, 0, 0);
    FT_Load_Glyph(face, glyph, FT_LOAD_NO_BITMAP);

    int left  = face->glyph->metrics.horiBearingX;
    int right = face->glyph->metrics.horiBearingX + face->glyph->metrics.width;
    int top    = face->glyph->metrics.horiBearingY;
    int bottom = face->glyph->metrics.horiBearingY - face->glyph->metrics.height;

    QFixedPoint p;
    p.x = 0;
    p.y = 0;

    metrics->width = QFixed::fromFixed(right-left);
    metrics->height = QFixed::fromFixed(top-bottom);
    metrics->x = QFixed::fromFixed(left);
    metrics->y = QFixed::fromFixed(-top);
    metrics->xoff = QFixed::fromFixed(face->glyph->advance.x);

    if (!FT_IS_SCALABLE(freetype->face))
        QFreetypeFace::addBitmapToPath(face->glyph, p, path);
    else
        QFreetypeFace::addGlyphToPath(face, face->glyph, p, path, face->units_per_EM << 6, face->units_per_EM << 6);

    FT_Set_Transform(face, &freetype->matrix, 0);
    unlockFace();
}

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;
}

bool QFontEngineFT::canRender(const QChar *string, int len)
{
    FT_Face face = freetype->face;
#if 0
    if (_cmap != -1) {
        lockFace();
        for ( int i = 0; i < len; i++ ) {
            unsigned int uc = getChar(string, i, len);
            if (!FcCharSetHasChar (_font->charset, uc) && getAdobeCharIndex(face, _cmap, uc) == 0) {
                allExist = false;
                break;
            }
        }
        unlockFace();
    } else
#endif
    {
        for ( int i = 0; i < len; i++ ) {
            unsigned int uc = getChar(string, i, len);
            if (!FT_Get_Char_Index(face, uc))
                    return false;
        }
    }
    return true;
}

void QFontEngineFT::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags)
{
    if (!glyphs.numGlyphs)
        return;

    if (FT_IS_SCALABLE(freetype->face)) {
        QFontEngine::addOutlineToPath(x, y, glyphs, path, flags);
    } else {
        QVarLengthArray<QFixedPoint> positions;
        QVarLengthArray<glyph_t> positioned_glyphs;
        QTransform matrix;
        matrix.translate(x, y);
        getGlyphPositions(glyphs, matrix, flags, positioned_glyphs, positions);

        FT_Face face = lockFace(Unscaled);
        for (int gl = 0; gl < glyphs.numGlyphs; gl++) {
            FT_UInt glyph = positioned_glyphs[gl];
            FT_Load_Glyph(face, glyph, FT_LOAD_TARGET_MONO);
            freetype->addBitmapToPath(face->glyph, positions[gl], path);
        }
        unlockFace();
    }
}

void QFontEngineFT::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int numGlyphs,
                                    QPainterPath *path, QTextItem::RenderFlags)
{
    FT_Face face = lockFace(Unscaled);

    for (int gl = 0; gl < numGlyphs; gl++) {
        FT_UInt glyph = glyphs[gl];

        FT_Load_Glyph(face, glyph, FT_LOAD_NO_BITMAP);

        FT_GlyphSlot g = face->glyph;
        if (g->format != FT_GLYPH_FORMAT_OUTLINE)
            continue;
        QFreetypeFace::addGlyphToPath(face, g, positions[gl], path, xsize, ysize);
    }
    unlockFace();
}

bool QFontEngineFT::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs,
                                 QTextEngine::ShaperFlags flags) const
{
    if (*nglyphs < len) {
        *nglyphs = len;
        return false;
    }

#if !defined(QT_NO_FONTCONFIG)
    extern QMutex *qt_fontdatabase_mutex();
    QMutex *mtx = 0;
#endif

    bool mirrored = flags & QTextEngine::RightToLeft;
    int glyph_pos = 0;
    if (freetype->symbol_map) {
        FT_Face face = freetype->face;
        for ( int i = 0; i < len; ++i ) {
            unsigned int uc = getChar(str, i, len);
            if (mirrored)
                uc = QChar::mirroredChar(uc);
            glyphs->glyphs[glyph_pos] = uc < QFreetypeFace::cmapCacheSize ? freetype->cmapCache[uc] : 0;
            if ( !glyphs->glyphs[glyph_pos] ) {
                glyph_t glyph;
#if !defined(QT_NO_FONTCONFIG)
                if (!mtx) {
                    mtx = qt_fontdatabase_mutex();
                    mtx->lock();
                }

                if (FcCharSetHasChar(freetype->charset, uc)) {
#else
                if (false) {
#endif
                redo0:
                    glyph = FT_Get_Char_Index(face, uc);
                    if (!glyph && (uc == 0xa0 || uc == 0x9)) {
                        uc = 0x20;
                        goto redo0;
                    }
                } else {
                    FT_Set_Charmap(face, freetype->symbol_map);
                    glyph = FT_Get_Char_Index(face, uc);
                    FT_Set_Charmap(face, freetype->unicode_map);
                }
                glyphs->glyphs[glyph_pos] = glyph;
                if (uc < QFreetypeFace::cmapCacheSize)
                    freetype->cmapCache[uc] = glyph;
            }
            ++glyph_pos;
        }
    } else {
        FT_Face face = freetype->face;
        for (int i = 0; i < len; ++i) {
            unsigned int uc = getChar(str, i, len);
            if (mirrored)
                uc = QChar::mirroredChar(uc);
            glyphs->glyphs[glyph_pos] = uc < QFreetypeFace::cmapCacheSize ? freetype->cmapCache[uc] : 0;
            if (!glyphs->glyphs[glyph_pos]) {
#if !defined(QT_NO_FONTCONFIG)
                if (!mtx) {
                    mtx = qt_fontdatabase_mutex();
                    mtx->lock();
                }

                if (FcCharSetHasChar(freetype->charset, uc))
#endif
                {
                redo:
                    glyph_t glyph = FT_Get_Char_Index(face, uc);
                    if (!glyph && (uc == 0xa0 || uc == 0x9)) {
                        uc = 0x20;
                        goto redo;
                    }
                    glyphs->glyphs[glyph_pos] = glyph;
                    if (uc < QFreetypeFace::cmapCacheSize)
                        freetype->cmapCache[uc] = glyph;
                }
            }
            ++glyph_pos;
        }
    }

    *nglyphs = glyph_pos;
    glyphs->numGlyphs = glyph_pos;

#if !defined(QT_NO_FONTCONFIG)
    if (mtx)
        mtx->unlock();
#endif

    if (flags & QTextEngine::GlyphIndicesOnly)
        return true;

    recalcAdvances(glyphs, flags);

    return true;
}

void QFontEngineFT::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const
{
    FT_Face face = 0;
    if (flags & QTextEngine::DesignMetrics) {
        for (int i = 0; i < glyphs->numGlyphs; i++) {
            Glyph *g = defaultGlyphSet.glyph_data.value(glyphs->glyphs[i]);
            if (g) {
                glyphs->advances_x[i] = QFixed::fromFixed(g->linearAdvance);
            } else {
                if (!face)
                    face = lockFace();
                g = loadGlyph(glyphs->glyphs[i], Format_None, true);
                glyphs->advances_x[i] = QFixed::fromFixed(face->glyph->linearHoriAdvance >> 10);
            }
            glyphs->advances_y[i] = 0;
        }
    } else {
        for (int i = 0; i < glyphs->numGlyphs; i++) {
            Glyph *g = defaultGlyphSet.glyph_data.value(glyphs->glyphs[i]);
            if (g) {
                glyphs->advances_x[i] = QFixed(g->advance);
            } else {
                if (!face)
                    face = lockFace();
                g = loadGlyph(glyphs->glyphs[i], Format_None, true);
                glyphs->advances_x[i] = QFixed::fromFixed(face->glyph->metrics.horiAdvance).round();
            }
            glyphs->advances_y[i] = 0;
        }
    }
    if (face)
        unlockFace();
}

glyph_metrics_t QFontEngineFT::boundingBox(const QGlyphLayout &glyphs)
{

    FT_Face face = 0;

    glyph_metrics_t overall;
    // initialize with line height, we get the same behaviour on all platforms
    overall.y = -ascent();
    overall.height = ascent() + descent() + 1;

    QFixed ymax = 0;
    QFixed xmax = 0;
    for (int i = 0; i < glyphs.numGlyphs; i++) {
        Glyph *g = defaultGlyphSet.glyph_data.value(glyphs.glyphs[i]);
        if (!g) {
            if (!face)
                face = lockFace();
            g = loadGlyph(glyphs.glyphs[i], Format_None, true);
        }
        if (g) {
            QFixed x = overall.xoff + glyphs.offsets[i].x + g->x;
            QFixed y = overall.yoff + glyphs.offsets[i].y - g->y;
            overall.x = qMin(overall.x, x);
            overall.y = qMin(overall.y, y);
            xmax = qMax(xmax, x + g->width);
            ymax = qMax(ymax, y + g->height);
            overall.xoff += qRound(g->advance);
        } else {
            int left  = FLOOR(face->glyph->metrics.horiBearingX);
            int right = CEIL(face->glyph->metrics.horiBearingX + face->glyph->metrics.width);
            int top    = CEIL(face->glyph->metrics.horiBearingY);
            int bottom = FLOOR(face->glyph->metrics.horiBearingY - face->glyph->metrics.height);

            QFixed x = overall.xoff + glyphs.offsets[i].x - (-TRUNC(left));
            QFixed y = overall.yoff + glyphs.offsets[i].y - TRUNC(top);
            overall.x = qMin(overall.x, x);
            overall.y = qMin(overall.y, y);
            xmax = qMax(xmax, x + TRUNC(right - left));
            ymax = qMax(ymax, y + TRUNC(top - bottom));
            overall.xoff += qRound(TRUNC(ROUND(face->glyph->advance.x)));
        }
    }
    overall.height = qMax(overall.height, ymax - overall.y);
    overall.width = xmax - overall.x;

    if (face)
        unlockFace();

    return overall;
}

glyph_metrics_t QFontEngineFT::boundingBox(glyph_t glyph)
{
    FT_Face face = 0;
    glyph_metrics_t overall;
    Glyph *g = defaultGlyphSet.glyph_data.value(glyph);
    if (!g) {
        face = lockFace();
        g = loadGlyph(glyph, Format_None, true);
    }
    if (g) {
        overall.x = g->x;
        overall.y = -g->y;
        overall.width = g->width;
        overall.height = g->height;
        overall.xoff = g->advance;
    } else {
        int left  = FLOOR(face->glyph->metrics.horiBearingX);
        int right = CEIL(face->glyph->metrics.horiBearingX + face->glyph->metrics.width);
        int top    = CEIL(face->glyph->metrics.horiBearingY);
        int bottom = FLOOR(face->glyph->metrics.horiBearingY - face->glyph->metrics.height);

        overall.width = TRUNC(right-left);
        overall.height = TRUNC(top-bottom);
        overall.x = TRUNC(left);
        overall.y = -TRUNC(top);
        overall.xoff = TRUNC(ROUND(face->glyph->advance.x));
    }
    if (face)
        unlockFace();
    return overall;
}

glyph_metrics_t QFontEngineFT::boundingBox(glyph_t glyph, const QTransform &matrix)
{
    FT_Face face = 0;
    glyph_metrics_t overall;
    QGlyphSet *glyphSet = 0;
    if (matrix.type() > QTransform::TxTranslate && FT_IS_SCALABLE(freetype->face)) {
        // TODO move everything here to a method of its own to access glyphSets
        // to be shared with a new method that will replace loadTransformedGlyphSet()
        FT_Matrix m;
        m.xx = FT_Fixed(matrix.m11() * 65536);
        m.xy = FT_Fixed(-matrix.m21() * 65536);
        m.yx = FT_Fixed(-matrix.m12() * 65536);
        m.yy = FT_Fixed(matrix.m22() * 65536);
        for (int i = 0; i < transformedGlyphSets.count(); ++i) {
            const QGlyphSet &g = transformedGlyphSets.at(i);
            if (g.transformationMatrix.xx == m.xx
                && g.transformationMatrix.xy == m.xy
                && g.transformationMatrix.yx == m.yx
                && g.transformationMatrix.yy == m.yy) {

                // found a match, move it to the front
                transformedGlyphSets.move(i, 0);
                glyphSet = &transformedGlyphSets[0];
                break;
            }
        }

        if (!glyphSet) {
            // don't cache more than 10 transformations
            if (transformedGlyphSets.count() >= 10) {
                transformedGlyphSets.move(transformedGlyphSets.size() - 1, 0);
                freeServerGlyphSet(transformedGlyphSets.at(0).id);
            } else {
                transformedGlyphSets.prepend(QGlyphSet());
            }
            glyphSet = &transformedGlyphSets[0];
            qDeleteAll(glyphSet->glyph_data);
            glyphSet->glyph_data.clear();
            glyphSet->id = allocateServerGlyphSet();
            glyphSet->transformationMatrix = m;
        }
        Q_ASSERT(glyphSet);
    } else {
        glyphSet = &defaultGlyphSet;
    }
    Glyph * g = glyphSet->glyph_data.value(glyph);
    if (!g) {
        face = lockFace();
        g = loadGlyphMetrics(glyphSet, glyph);
    }

    if (g) {
        overall.x = g->x;
        overall.y = -g->y;
        overall.width = g->width;
        overall.height = g->height;
        overall.xoff = g->advance;
    } else {
        int left  = FLOOR(face->glyph->metrics.horiBearingX);
        int right = CEIL(face->glyph->metrics.horiBearingX + face->glyph->metrics.width);
        int top    = CEIL(face->glyph->metrics.horiBearingY);
        int bottom = FLOOR(face->glyph->metrics.horiBearingY - face->glyph->metrics.height);

        overall.width = TRUNC(right-left);
        overall.height = TRUNC(top-bottom);
        overall.x = TRUNC(left);
        overall.y = -TRUNC(top);
        overall.xoff = TRUNC(ROUND(face->glyph->advance.x));
    }
    if (face)
        unlockFace();
    return overall;
}

QImage QFontEngineFT::alphaMapForGlyph(glyph_t g)
{
    lockFace();

    GlyphFormat glyph_format = antialias ? Format_A8 : Format_Mono;

    Glyph *glyph = defaultGlyphSet.outline_drawing ? 0 : loadGlyph(g, glyph_format);
    if (!glyph) {
        unlockFace();
        return QFontEngine::alphaMapForGlyph(g);
    }

    const int pitch = antialias ? (glyph->width + 3) & ~3 : ((glyph->width + 31)/32) * 4;

    QImage img(glyph->width, glyph->height, antialias ? QImage::Format_Indexed8 : QImage::Format_Mono);
    if (antialias) {
        QVector<QRgb> colors(256);
        for (int i=0; i<256; ++i)
            colors[i] = qRgba(0, 0, 0, i);
        img.setColorTable(colors);
    } else {
        QVector<QRgb> colors(2);
        colors[0] = qRgba(0, 0, 0, 0);
        colors[1] = qRgba(0, 0, 0, 255);
        img.setColorTable(colors);
    }
    Q_ASSERT(img.bytesPerLine() == pitch);
    if (glyph->width) {
        for (int y = 0; y < glyph->height; ++y)
            memcpy(img.scanLine(y), &glyph->data[y * pitch], pitch);
    }
    unlockFace();

    return img;
}

QImage QFontEngineFT::alphaRGBMapForGlyph(glyph_t g, int margin, const QTransform &t)
{
    if (t.type() > QTransform::TxTranslate)
        return QFontEngine::alphaRGBMapForGlyph(g, margin, t);

    lockFace();

    GlyphFormat glyph_format = Format_A32;

    Glyph *glyph = defaultGlyphSet.outline_drawing ? 0 : loadGlyph(g, glyph_format);
    if (!glyph) {
        unlockFace();
        return QFontEngine::alphaRGBMapForGlyph(g, margin, t);
    }

    QImage img(glyph->width, glyph->height, QImage::Format_RGB32);
    memcpy(img.bits(), glyph->data, 4 * glyph->width * glyph->height);
    unlockFace();

    return img;
}

void QFontEngineFT::removeGlyphFromCache(glyph_t glyph)
{
    delete defaultGlyphSet.glyph_data.take(glyph);
}

int QFontEngineFT::glyphCount() const
{
    int count = 0;
    FT_Face face = lockFace();
    if (face) {
        count = face->num_glyphs;
        unlockFace();
    }
    return count;
}

FT_Face QFontEngineFT::lockFace(Scaling scale) const
{
    freetype->lock();
    FT_Face face = freetype->face;
    if (scale == Unscaled) {
        FT_Set_Char_Size(face, face->units_per_EM << 6, face->units_per_EM << 6, 0, 0);
        freetype->xsize = face->units_per_EM << 6;
        freetype->ysize = face->units_per_EM << 6;
    } else if (freetype->xsize != xsize || freetype->ysize != ysize) {
        FT_Set_Char_Size(face, xsize, ysize, 0, 0);
        freetype->xsize = xsize;
        freetype->ysize = ysize;
    }
    if (freetype->matrix.xx != matrix.xx ||
        freetype->matrix.yy != matrix.yy ||
        freetype->matrix.xy != matrix.xy ||
        freetype->matrix.yx != matrix.yx) {
        freetype->matrix = matrix;
        FT_Set_Transform(face, &freetype->matrix, 0);
    }

    return face;
}

void QFontEngineFT::unlockFace() const
{
    freetype->unlock();
}

FT_Face QFontEngineFT::non_locked_face() const
{
    return freetype->face;
}


QFontEngineFT::QGlyphSet::QGlyphSet()
    : id(0), outline_drawing(false)
{
    transformationMatrix.xx = 0x10000;
    transformationMatrix.yy = 0x10000;
    transformationMatrix.xy = 0;
    transformationMatrix.yx = 0;
}

QFontEngineFT::QGlyphSet::~QGlyphSet()
{
    qDeleteAll(glyph_data);
}

unsigned long QFontEngineFT::allocateServerGlyphSet()
{
    return 0;
}

void QFontEngineFT::freeServerGlyphSet(unsigned long id)
{
    Q_UNUSED(id);
}

HB_Error QFontEngineFT::getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints)
{
    lockFace();
    HB_Error result = freetype->getPointInOutline(glyph, flags, point, xpos, ypos, nPoints);
    unlockFace();
    return result;
}

QT_END_NAMESPACE

#endif // QT_NO_FREETYPE
