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#include "qfontengine_coretext_p.h"

#include <QtCore/qendian.h>
#include <QtCore/qsettings.h>

#include <private/qimage_p.h>

#if !defined(Q_WS_MAC) || (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)

QT_BEGIN_NAMESPACE

static float SYNTHETIC_ITALIC_SKEW = tanf(14 * acosf(0) / 90);

static void loadAdvancesForGlyphs(CTFontRef ctfont,
                                  QVarLengthArray<CGGlyph> &cgGlyphs,
                                  QGlyphLayout *glyphs, int len,
                                  QFontEngine::ShaperFlags flags,
                                  const QFontDef &fontDef)
{
    Q_UNUSED(flags);
    QVarLengthArray<CGSize> advances(len);
    CTFontGetAdvancesForGlyphs(ctfont, kCTFontHorizontalOrientation, cgGlyphs.data(), advances.data(), len);

    for (int i = 0; i < len; ++i) {
        if (glyphs->glyphs[i] & 0xff000000)
            continue;
        glyphs->advances_x[i] = QFixed::fromReal(advances[i].width);
        glyphs->advances_y[i] = QFixed::fromReal(advances[i].height);
    }

    if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
        for (int i = 0; i < len; ++i) {
            glyphs->advances_x[i] = glyphs->advances_x[i].round();
            glyphs->advances_y[i] = glyphs->advances_y[i].round();
        }
    }
}


int QCoreTextFontEngine::antialiasingThreshold = 0;
QFontEngineGlyphCache::Type QCoreTextFontEngine::defaultGlyphFormat = QFontEngineGlyphCache::Raster_RGBMask;

CGAffineTransform qt_transform_from_fontdef(const QFontDef &fontDef)
{
    CGAffineTransform transform = CGAffineTransformIdentity;
    if (fontDef.stretch != 100)
        transform = CGAffineTransformMakeScale(float(fontDef.stretch) / float(100), 1);
    return transform;
}

QCoreTextFontEngine::QCoreTextFontEngine(CTFontRef font, const QFontDef &def)
{
    fontDef = def;
    transform = qt_transform_from_fontdef(fontDef);
    ctfont = font;
    CFRetain(ctfont);
    cgFont = CTFontCopyGraphicsFont(font, NULL);
    init();
}

QCoreTextFontEngine::QCoreTextFontEngine(CGFontRef font, const QFontDef &def)
{
    fontDef = def;
    transform = qt_transform_from_fontdef(fontDef);
    cgFont = font;
    // Keep reference count balanced
    CFRetain(cgFont);
    ctfont = CTFontCreateWithGraphicsFont(font, fontDef.pixelSize, &transform, NULL);
    init();
}

QCoreTextFontEngine::~QCoreTextFontEngine()
{
    CFRelease(cgFont);
    CFRelease(ctfont);
}

static QFont::Weight weightFromInteger(int weight)
{
    if (weight < 400)
        return QFont::Light;
    else if (weight < 600)
        return QFont::Normal;
    else if (weight < 700)
        return QFont::DemiBold;
    else if (weight < 800)
        return QFont::Bold;
    else
        return QFont::Black;
}

int getTraitValue(CFDictionaryRef allTraits, CFStringRef trait)
{
    if (CFDictionaryContainsKey(allTraits, trait)) {
        CFNumberRef traitNum = (CFNumberRef) CFDictionaryGetValue(allTraits, trait);
        float v = 0;
        CFNumberGetValue(traitNum, kCFNumberFloatType, &v);
        // the value we get from CFNumberRef is from -1.0 to 1.0
        int value = v * 500 + 500;
        return value;
    }

    return 0;
}

void QCoreTextFontEngine::init()
{
    Q_ASSERT(ctfont != NULL);
    Q_ASSERT(cgFont != NULL);

    glyphFormat = defaultGlyphFormat;

    QCFString family = CTFontCopyFamilyName(ctfont);
    fontDef.family = family;

    QCFString styleName = (CFStringRef) CTFontCopyAttribute(ctfont, kCTFontStyleNameAttribute);
    fontDef.styleName = styleName;

    synthesisFlags = 0;
    CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(ctfont);
    if (traits & kCTFontItalicTrait)
        fontDef.style = QFont::StyleItalic;

    CFDictionaryRef allTraits = CTFontCopyTraits(ctfont);
    fontDef.weight = weightFromInteger(getTraitValue(allTraits, kCTFontWeightTrait));
    int slant = getTraitValue(allTraits, kCTFontSlantTrait);
    if (slant > 500 && !(traits & kCTFontItalicTrait))
        fontDef.style = QFont::StyleOblique;
    CFRelease(allTraits);

    if (fontDef.weight >= QFont::Bold && !(traits & kCTFontBoldTrait))
        synthesisFlags |= SynthesizedBold;
    // XXX: we probably don't need to synthesis italic for oblique font
    if (fontDef.style != QFont::StyleNormal && !(traits & kCTFontItalicTrait))
        synthesisFlags |= SynthesizedItalic;

    avgCharWidth = 0;
    QByteArray os2Table = getSfntTable(MAKE_TAG('O', 'S', '/', '2'));
    unsigned emSize = CTFontGetUnitsPerEm(ctfont);
    if (os2Table.size() >= 10) {
        fsType = qFromBigEndian<quint16>(reinterpret_cast<const uchar *>(os2Table.constData() + 8));
        // qAbs is a workaround for weird fonts like Lucida Grande
        qint16 width = qAbs(qFromBigEndian<qint16>(reinterpret_cast<const uchar *>(os2Table.constData() + 2)));
        avgCharWidth = QFixed::fromReal(width * fontDef.pixelSize / emSize);
    } else
        avgCharWidth = QFontEngine::averageCharWidth();
}

bool QCoreTextFontEngine::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs,
                                       int *nglyphs, QFontEngine::ShaperFlags flags) const
{
    QCFType<CFStringRef> cfstring;

    QVarLengthArray<CGGlyph> cgGlyphs(len);
    CTFontGetGlyphsForCharacters(ctfont, (const UniChar*)str, cgGlyphs.data(), len);

    int glyph_pos = 0;
    for (int i = 0; i < len; ++i) {
        if (cgGlyphs[i]) {
            glyphs->glyphs[glyph_pos] = cgGlyphs[i];
            if (glyph_pos < i)
                cgGlyphs[glyph_pos] = cgGlyphs[i];
        }
        glyph_pos++;

        // If it's a non-BMP char, skip the lower part of surrogate pair and go
        // directly to the next char without increasing glyph_pos
        if (str[i].isHighSurrogate() && i < len-1 && str[i+1].isLowSurrogate())
            ++i;
    }

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

    if (flags & GlyphIndicesOnly)
        return true;

    QVarLengthArray<CGSize> advances(glyph_pos);
    CTFontGetAdvancesForGlyphs(ctfont, kCTFontHorizontalOrientation, cgGlyphs.data(), advances.data(), glyph_pos);

    for (int i = 0; i < glyph_pos; ++i) {
        if (glyphs->glyphs[i] & 0xff000000)
            continue;
        glyphs->advances_x[i] = QFixed::fromReal(advances[i].width);
        glyphs->advances_y[i] = QFixed::fromReal(advances[i].height);
    }

    if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
        for (int i = 0; i < glyph_pos; ++i) {
            glyphs->advances_x[i] = glyphs->advances_x[i].round();
            glyphs->advances_y[i] = glyphs->advances_y[i].round();
        }
    }
    return true;
}

glyph_metrics_t QCoreTextFontEngine::boundingBox(const QGlyphLayout &glyphs)
{
    QFixed w;
    bool round = fontDef.styleStrategy & QFont::ForceIntegerMetrics;

    for (int i = 0; i < glyphs.numGlyphs; ++i) {
        w += round ? glyphs.effectiveAdvance(i).round()
                   : glyphs.effectiveAdvance(i);
    }
    return glyph_metrics_t(0, -(ascent()), w - lastRightBearing(glyphs, round), ascent()+descent(), w, 0);
}

glyph_metrics_t QCoreTextFontEngine::boundingBox(glyph_t glyph)
{
    glyph_metrics_t ret;
    CGGlyph g = glyph;
    CGRect rect = CTFontGetBoundingRectsForGlyphs(ctfont, kCTFontHorizontalOrientation, &g, 0, 1);
    if (synthesisFlags & QFontEngine::SynthesizedItalic) {
        rect.size.width += rect.size.height * SYNTHETIC_ITALIC_SKEW;
    }
    ret.width = QFixed::fromReal(rect.size.width);
    ret.height = QFixed::fromReal(rect.size.height);
    ret.x = QFixed::fromReal(rect.origin.x);
    ret.y = -QFixed::fromReal(rect.origin.y) - ret.height;
    CGSize advances[1];
    CTFontGetAdvancesForGlyphs(ctfont, kCTFontHorizontalOrientation, &g, advances, 1);
    ret.xoff = QFixed::fromReal(advances[0].width);
    ret.yoff = QFixed::fromReal(advances[0].height);

    if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
        ret.xoff = ret.xoff.round();
        ret.yoff = ret.yoff.round();
    }

    return ret;
}

QFixed QCoreTextFontEngine::ascent() const
{
    return (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
            ? QFixed::fromReal(CTFontGetAscent(ctfont)).round()
            : QFixed::fromReal(CTFontGetAscent(ctfont));
}
QFixed QCoreTextFontEngine::descent() const
{
    QFixed d = QFixed::fromReal(CTFontGetDescent(ctfont));
    if (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
        d = d.round();

    return d;
}
QFixed QCoreTextFontEngine::leading() const
{
    return (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
            ? QFixed::fromReal(CTFontGetLeading(ctfont)).round()
            : QFixed::fromReal(CTFontGetLeading(ctfont));
}
QFixed QCoreTextFontEngine::xHeight() const
{
    return (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
            ? QFixed::fromReal(CTFontGetXHeight(ctfont)).round()
            : QFixed::fromReal(CTFontGetXHeight(ctfont));
}

QFixed QCoreTextFontEngine::averageCharWidth() const
{
    return (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
            ? avgCharWidth.round() : avgCharWidth;
}

qreal QCoreTextFontEngine::maxCharWidth() const
{
    return 0;
}

qreal QCoreTextFontEngine::minLeftBearing() const
{
    return 0;
}

qreal QCoreTextFontEngine::minRightBearing() const
{
    return 0;
}

void QCoreTextFontEngine::draw(CGContextRef ctx, qreal x, qreal y, const QTextItemInt &ti, int paintDeviceHeight)
{
    QVarLengthArray<QFixedPoint> positions;
    QVarLengthArray<glyph_t> glyphs;
    QTransform matrix;
    matrix.translate(x, y);
    getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
    if (glyphs.size() == 0)
        return;

    CGContextSetFontSize(ctx, fontDef.pixelSize);

    CGAffineTransform oldTextMatrix = CGContextGetTextMatrix(ctx);

    CGAffineTransform cgMatrix = CGAffineTransformMake(1, 0, 0, -1, 0, -paintDeviceHeight);

    CGAffineTransformConcat(cgMatrix, oldTextMatrix);

    if (synthesisFlags & QFontEngine::SynthesizedItalic)
        cgMatrix = CGAffineTransformConcat(cgMatrix, CGAffineTransformMake(1, 0, -SYNTHETIC_ITALIC_SKEW, 1, 0, 0));

    cgMatrix = CGAffineTransformConcat(cgMatrix, transform);

    CGContextSetTextMatrix(ctx, cgMatrix);

    CGContextSetTextDrawingMode(ctx, kCGTextFill);


    QVarLengthArray<CGSize> advances(glyphs.size());
    QVarLengthArray<CGGlyph> cgGlyphs(glyphs.size());

    for (int i = 0; i < glyphs.size() - 1; ++i) {
        advances[i].width = (positions[i + 1].x - positions[i].x).toReal();
        advances[i].height = (positions[i + 1].y - positions[i].y).toReal();
        cgGlyphs[i] = glyphs[i];
    }
    advances[glyphs.size() - 1].width = 0;
    advances[glyphs.size() - 1].height = 0;
    cgGlyphs[glyphs.size() - 1] = glyphs[glyphs.size() - 1];

    CGContextSetFont(ctx, cgFont);
    //NSLog(@"Font inDraw %@  ctfont %@", CGFontCopyFullName(cgFont), CTFontCopyFamilyName(ctfont));

    CGContextSetTextPosition(ctx, positions[0].x.toReal(), positions[0].y.toReal());

    CGContextShowGlyphsWithAdvances(ctx, cgGlyphs.data(), advances.data(), glyphs.size());

    if (synthesisFlags & QFontEngine::SynthesizedBold) {
        CGContextSetTextPosition(ctx, positions[0].x.toReal() + 0.5 * lineThickness().toReal(),
                                 positions[0].y.toReal());

        CGContextShowGlyphsWithAdvances(ctx, cgGlyphs.data(), advances.data(), glyphs.size());
    }

    CGContextSetTextMatrix(ctx, oldTextMatrix);
}

struct ConvertPathInfo
{
    ConvertPathInfo(QPainterPath *newPath, const QPointF &newPos) : path(newPath), pos(newPos) {}
    QPainterPath *path;
    QPointF pos;
};

static void convertCGPathToQPainterPath(void *info, const CGPathElement *element)
{
    ConvertPathInfo *myInfo = static_cast<ConvertPathInfo *>(info);
    switch(element->type) {
        case kCGPathElementMoveToPoint:
            myInfo->path->moveTo(element->points[0].x + myInfo->pos.x(),
                                 element->points[0].y + myInfo->pos.y());
            break;
        case kCGPathElementAddLineToPoint:
            myInfo->path->lineTo(element->points[0].x + myInfo->pos.x(),
                                 element->points[0].y + myInfo->pos.y());
            break;
        case kCGPathElementAddQuadCurveToPoint:
            myInfo->path->quadTo(element->points[0].x + myInfo->pos.x(),
                                 element->points[0].y + myInfo->pos.y(),
                                 element->points[1].x + myInfo->pos.x(),
                                 element->points[1].y + myInfo->pos.y());
            break;
        case kCGPathElementAddCurveToPoint:
            myInfo->path->cubicTo(element->points[0].x + myInfo->pos.x(),
                                  element->points[0].y + myInfo->pos.y(),
                                  element->points[1].x + myInfo->pos.x(),
                                  element->points[1].y + myInfo->pos.y(),
                                  element->points[2].x + myInfo->pos.x(),
                                  element->points[2].y + myInfo->pos.y());
            break;
        case kCGPathElementCloseSubpath:
            myInfo->path->closeSubpath();
            break;
        default:
            qDebug() << "Unhandled path transform type: " << element->type;
    }

}

void QCoreTextFontEngine::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nGlyphs,
                                          QPainterPath *path, QTextItem::RenderFlags)
{
    CGAffineTransform cgMatrix = CGAffineTransformIdentity;
    cgMatrix = CGAffineTransformScale(cgMatrix, 1, -1);

    if (synthesisFlags & QFontEngine::SynthesizedItalic)
        cgMatrix = CGAffineTransformConcat(cgMatrix, CGAffineTransformMake(1, 0, -SYNTHETIC_ITALIC_SKEW, 1, 0, 0));

    for (int i = 0; i < nGlyphs; ++i) {
        QCFType<CGPathRef> cgpath = CTFontCreatePathForGlyph(ctfont, glyphs[i], &cgMatrix);
        ConvertPathInfo info(path, positions[i].toPointF());
        CGPathApply(cgpath, &info, convertCGPathToQPainterPath);
    }
}

QImage QCoreTextFontEngine::imageForGlyph(glyph_t glyph, QFixed subPixelPosition, bool aa, const QTransform &m)
{
    glyph_metrics_t br = boundingBox(glyph);

    if (m.isScaling()) {
        qreal hscale = m.m11();
        qreal vscale = m.m22();
        br.width  = QFixed::fromReal(br.width.toReal() * hscale);
        br.height = QFixed::fromReal(br.height.toReal() * vscale);
        br.x      = QFixed::fromReal(br.x.toReal() * hscale);
        br.y      = QFixed::fromReal(br.y.toReal() * vscale);
    }

    QImage im(qRound(br.width)+2, qRound(br.height)+2, QImage::Format_RGB32);
    im.fill(0);

#ifndef Q_OS_IOS
    CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
#else
    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
#endif
    uint cgflags = kCGImageAlphaNoneSkipFirst;
#ifdef kCGBitmapByteOrder32Host //only needed because CGImage.h added symbols in the minor version
    cgflags |= kCGBitmapByteOrder32Host;
#endif
    CGContextRef ctx = CGBitmapContextCreate(im.bits(), im.width(), im.height(),
                                             8, im.bytesPerLine(), colorspace,
                                             cgflags);
    CGContextSetFontSize(ctx, fontDef.pixelSize);
    CGContextSetShouldAntialias(ctx, (aa || fontDef.pointSize > antialiasingThreshold)
                                 && !(fontDef.styleStrategy & QFont::NoAntialias));
    CGContextSetShouldSmoothFonts(ctx, aa);
    CGAffineTransform oldTextMatrix = CGContextGetTextMatrix(ctx);
    CGAffineTransform cgMatrix = CGAffineTransformIdentity;

    CGAffineTransformConcat(cgMatrix, oldTextMatrix);

    if (synthesisFlags & QFontEngine::SynthesizedItalic)
        cgMatrix = CGAffineTransformConcat(cgMatrix, CGAffineTransformMake(1, 0, SYNTHETIC_ITALIC_SKEW, 1, 0, 0));

    cgMatrix = CGAffineTransformConcat(cgMatrix, transform);
    if (m.isScaling())
        cgMatrix = CGAffineTransformConcat(cgMatrix, CGAffineTransformMakeScale(m.m11(), m.m22()));

    CGContextSetTextMatrix(ctx, cgMatrix);
    CGContextSetRGBFillColor(ctx, 1, 1, 1, 1);
    CGContextSetTextDrawingMode(ctx, kCGTextFill);

    CGContextSetFont(ctx, cgFont);

    qreal pos_x = -br.x.truncate() + subPixelPosition.toReal();
    qreal pos_y = im.height() + br.y.toReal();
    CGContextSetTextPosition(ctx, pos_x, pos_y);

    CGSize advance;
    advance.width = 0;
    advance.height = 0;
    CGGlyph cgGlyph = glyph;
    CGContextShowGlyphsWithAdvances(ctx, &cgGlyph, &advance, 1);

    if (synthesisFlags & QFontEngine::SynthesizedBold) {
        CGContextSetTextPosition(ctx, pos_x + 0.5 * lineThickness().toReal(), pos_y);
        CGContextShowGlyphsWithAdvances(ctx, &cgGlyph, &advance, 1);
    }

    CGContextRelease(ctx);
    CGColorSpaceRelease(colorspace);

    return im;
}

QImage QCoreTextFontEngine::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition)
{
    QImage im = imageForGlyph(glyph, subPixelPosition, false, QTransform());

    QImage indexed(im.width(), im.height(), QImage::Format_Indexed8);
    QVector<QRgb> colors(256);
    for (int i=0; i<256; ++i)
        colors[i] = qRgba(0, 0, 0, i);
    indexed.setColorTable(colors);

    for (int y=0; y<im.height(); ++y) {
        uint *src = (uint*) im.scanLine(y);
        uchar *dst = indexed.scanLine(y);
        for (int x=0; x<im.width(); ++x) {
            *dst = qGray(*src);
            ++dst;
            ++src;
        }
    }

    return indexed;
}

QImage QCoreTextFontEngine::alphaRGBMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &x)
{
    if (x.type() > QTransform::TxScale)
        return QFontEngine::alphaRGBMapForGlyph(glyph, subPixelPosition, x);

    QImage im = imageForGlyph(glyph, subPixelPosition, true, x);
    qGamma_correct_back_to_linear_cs(&im);
    return im;
}

void QCoreTextFontEngine::recalcAdvances(QGlyphLayout *glyphs, QFontEngine::ShaperFlags flags) const
{
    int i, numGlyphs = glyphs->numGlyphs;
    QVarLengthArray<CGGlyph> cgGlyphs(numGlyphs);

    for (i = 0; i < numGlyphs; ++i) {
        if (glyphs->glyphs[i] & 0xff000000)
            cgGlyphs[i] = 0;
        else
            cgGlyphs[i] = glyphs->glyphs[i];
    }

    loadAdvancesForGlyphs(ctfont, cgGlyphs, glyphs, numGlyphs, flags, fontDef);
}

QFontEngine::FaceId QCoreTextFontEngine::faceId() const
{
    return QFontEngine::FaceId();
}

bool QCoreTextFontEngine::canRender(const QChar *string, int len)
{
    QVarLengthArray<CGGlyph> cgGlyphs(len);
    return CTFontGetGlyphsForCharacters(ctfont, (const UniChar *) string, cgGlyphs.data(), len);
}

bool QCoreTextFontEngine::getSfntTableData(uint tag, uchar *buffer, uint *length) const
{
    QCFType<CFDataRef> table = CTFontCopyTable(ctfont, tag, 0);
    if (!table || !length)
        return false;
    CFIndex tableLength = CFDataGetLength(table);
    int availableLength = *length;
    *length = tableLength;
    if (buffer) {
        if (tableLength > availableLength)
            return false;
        CFDataGetBytes(table, CFRangeMake(0, tableLength), buffer);
    }
    return true;
}

void QCoreTextFontEngine::getUnscaledGlyph(glyph_t, QPainterPath *, glyph_metrics_t *)
{
    // ###
}

QFixed QCoreTextFontEngine::emSquareSize() const
{
    return QFixed::QFixed(int(CTFontGetUnitsPerEm(ctfont)));
}

QFontEngine *QCoreTextFontEngine::cloneWithSize(qreal pixelSize) const
{
    QFontDef newFontDef = fontDef;
    newFontDef.pixelSize = pixelSize;
    newFontDef.pointSize = pixelSize * 72.0 / qt_defaultDpi();

    return new QCoreTextFontEngine(cgFont, newFontDef);
}

QT_END_NAMESPACE

#endif// !defined(Q_WS_MAC) || (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)