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#include "qfontengine_s60_p.h"

#include "qtextengine_p.h"

#include "qglobal.h"

#include <private/qapplication_p.h>

#include "qimage.h"

#include <private/qt_s60_p.h>

#include <e32base.h>

#include <e32std.h>

#include <eikenv.h>

#include <gdi.h>

QT_BEGIN_NAMESPACE

QFontEngineS60Extensions::QFontEngineS60Extensions(CFont* fontOwner, COpenFont *font)

    : m_font(font)

    , m_cmap(0)

    , m_symbolCMap(false)

    , m_fontOwner(fontOwner)

{

    TAny *shapingExtension = NULL;

    m_font->ExtendedInterface(KUidOpenFontShapingExtension, shapingExtension);

    m_shapingExtension = static_cast<MOpenFontShapingExtension*>(shapingExtension);

    TAny *trueTypeExtension = NULL;

    m_font->ExtendedInterface(KUidOpenFontTrueTypeExtension, trueTypeExtension);

    m_trueTypeExtension = static_cast<MOpenFontTrueTypeExtension*>(trueTypeExtension);

    Q_ASSERT(m_shapingExtension && m_trueTypeExtension);

}

QByteArray QFontEngineS60Extensions::getSfntTable(uint tag) const

{

    Q_ASSERT(m_trueTypeExtension->HasTrueTypeTable(tag));

    TInt error = KErrNone;

    TInt tableByteLength = 0;

    TAny *table = q_check_ptr(m_trueTypeExtension->GetTrueTypeTable(error, tag, &tableByteLength));

    QByteArray result(static_cast<const char*>(table), tableByteLength);

    m_trueTypeExtension->ReleaseTrueTypeTable(table);

    return result;

}

const unsigned char *QFontEngineS60Extensions::cmap() const

{

    if (!m_cmap) {

        m_cmapTable = getSfntTable(MAKE_TAG('c', 'm', 'a', 'p'));

        int size = 0;

        m_cmap = QFontEngineS60::getCMap(reinterpret_cast<const uchar *>(m_cmapTable.constData()), m_cmapTable.size(), &m_symbolCMap, &size);

    }

    return m_cmap;

}

QPainterPath QFontEngineS60Extensions::glyphOutline(glyph_t glyph) const

{

    QPainterPath result;

    QPolygonF polygon;

    TInt glyphIndex = glyph;

    TInt pointNumber = 0;

    TInt x, y;

    while (m_shapingExtension->GlyphPointInFontUnits(glyphIndex, pointNumber++, x, y)) {

        const QPointF point(qreal(x) / 0xffff, qreal(y) / 0xffff);

        if (polygon.contains(point)) {

            result.addPolygon(polygon);

            result.closeSubpath();

            polygon.clear();

        } else {

            polygon.append(point);

        }

    }

    return result;

}

CFont *QFontEngineS60Extensions::fontOwner() const

{

    return m_fontOwner;

}

// duplicated from qfontengine_xyz.cpp

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;

}

CFont *QFontEngineS60::fontWithSize(qreal size) const

{

    CFont *result = 0;

    TFontSpec fontSpec(qt_QString2TPtrC(QFontEngine::fontDef.family), TInt(size));

    fontSpec.iFontStyle.SetBitmapType(EAntiAliasedGlyphBitmap);

    fontSpec.iFontStyle.SetPosture(QFontEngine::fontDef.style == QFont::StyleNormal?EPostureUpright:EPostureItalic);

    fontSpec.iFontStyle.SetStrokeWeight(QFontEngine::fontDef.weight > QFont::Normal?EStrokeWeightBold:EStrokeWeightNormal);

    const TInt errorCode = S60->screenDevice()->GetNearestFontToDesignHeightInPixels(result, fontSpec);

    Q_ASSERT(result && (errorCode == 0));

    return result;

}

void QFontEngineS60::setFontScale(qreal scale)

{

    if (qFuzzyCompare(scale, qreal(1))) {

        if (!m_originalFont)

            m_originalFont = fontWithSize(m_originalFontSizeInPixels);

        m_activeFont = m_originalFont;

    } else {

        const qreal scaledFontSizeInPixels = m_originalFontSizeInPixels * scale;

        if (!m_scaledFont ||

                (TInt(scaledFontSizeInPixels) != TInt(m_scaledFontSizeInPixels))) {

            releaseFont(m_scaledFont);

            m_scaledFontSizeInPixels = scaledFontSizeInPixels;

            m_scaledFont = fontWithSize(m_scaledFontSizeInPixels);

        }

        m_activeFont = m_scaledFont;

    }

}

void QFontEngineS60::releaseFont(CFont *&font)

{

    if (font) {

        S60->screenDevice()->ReleaseFont(font);

        font = 0;

    }

}

QFontEngineS60::QFontEngineS60(const QFontDef &request, const QFontEngineS60Extensions *extensions)

    : m_extensions(extensions)

    , m_originalFont(0)

    , m_originalFontSizeInPixels((request.pixelSize >= 0)?

            request.pixelSize:pointsToPixels(request.pointSize))

    , m_scaledFont(0)

    , m_scaledFontSizeInPixels(0)

    , m_activeFont(0)

{

    QFontEngine::fontDef = request;

    setFontScale(1.0);

    cache_cost = sizeof(QFontEngineS60);

}

QFontEngineS60::~QFontEngineS60()

{

    releaseFont(m_originalFont);

    releaseFont(m_scaledFont);

}

bool QFontEngineS60::stringToCMap(const QChar *characters, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const

{

    if (*nglyphs < len) {

        *nglyphs = len;

        return false;

    }

    HB_Glyph *g = glyphs->glyphs;

    const unsigned char* cmap = m_extensions->cmap();

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

        const unsigned int uc = getChar(characters, i, len);

        *g++ = QFontEngine::getTrueTypeGlyphIndex(cmap, uc);

    }

    glyphs->numGlyphs = g - glyphs->glyphs;

    *nglyphs = glyphs->numGlyphs;

    if (flags & QTextEngine::GlyphIndicesOnly)

        return true;

    recalcAdvances(glyphs, flags);

    return true;

}

void QFontEngineS60::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const

{

    Q_UNUSED(flags);

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

        const glyph_metrics_t bbox = boundingBox_const(glyphs->glyphs[i]);

        glyphs->advances_x[i] = glyphs->offsets[i].x = bbox.xoff;

        glyphs->advances_y[i] = glyphs->offsets[i].y = bbox.yoff;

    }

}

QImage QFontEngineS60::alphaMapForGlyph(glyph_t glyph)

{

    TOpenFontCharMetrics metrics;

    const TUint8 *glyphBitmapBytes;

    TSize glyphBitmapSize;

    getCharacterData(glyph, metrics, glyphBitmapBytes, glyphBitmapSize);

    QImage result(glyphBitmapBytes, glyphBitmapSize.iWidth, glyphBitmapSize.iHeight, glyphBitmapSize.iWidth, QImage::Format_Indexed8);

    result.setColorTable(grayPalette());

    // The above setColorTable() call detached the image data anyway, so why not shape tha data a bit, while we can.

    // CFont::GetCharacterData() returns 8-bit data that obviously was 4-bit data before, and converted to 8-bit incorrectly.

    // The data values are 0x00, 0x10 ... 0xe0, 0xf0. So, a real opaque 0xff is never reached, which we get punished

    // for every time we want to blit this glyph in the raster paint engine.

    // "Fix" is to convert all 0xf0 to 0xff. Is fine, quality wise, and I assume faster than correcting all values.

    // Blitting is however, evidentially faster now.

    const int bpl = result.bytesPerLine();

    for (int row = 0; row < result.height(); ++row) {

        uchar *scanLine = result.scanLine(row);

        for (int column = 0; column < bpl; ++column) {

            if (*scanLine == 0xf0)

                *scanLine = 0xff;

            scanLine++;

        }

    }

    return result;

}

glyph_metrics_t QFontEngineS60::boundingBox(const QGlyphLayout &glyphs)

{

   if (glyphs.numGlyphs == 0)

        return glyph_metrics_t();

    QFixed w = 0;

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

        w += glyphs.effectiveAdvance(i);

    return glyph_metrics_t(0, -ascent(), w, ascent()+descent()+1, w, 0);

}

glyph_metrics_t QFontEngineS60::boundingBox_const(glyph_t glyph) const

{

    TOpenFontCharMetrics metrics;

    const TUint8 *glyphBitmapBytes;

    TSize glyphBitmapSize;

    getCharacterData(glyph, metrics, glyphBitmapBytes, glyphBitmapSize);

    TRect glyphBounds;

    metrics.GetHorizBounds(glyphBounds);

    const glyph_metrics_t result(

        glyphBounds.iTl.iX,

        glyphBounds.iTl.iY,

        glyphBounds.Width(),

        glyphBounds.Height(),

        metrics.HorizAdvance(),

        0

    );

    return result;

}

glyph_metrics_t QFontEngineS60::boundingBox(glyph_t glyph)

{

    return boundingBox_const(glyph);

}

QFixed QFontEngineS60::ascent() const

{

    return m_originalFont->FontMaxAscent();

}

QFixed QFontEngineS60::descent() const

{

    return m_originalFont->FontMaxDescent();

}

QFixed QFontEngineS60::leading() const

{

    return 0;

}

qreal QFontEngineS60::maxCharWidth() const

{

    return m_originalFont->MaxCharWidthInPixels();

}

const char *QFontEngineS60::name() const

{

    return "QFontEngineS60";

}

bool QFontEngineS60::canRender(const QChar *string, int len)

{

    const unsigned char *cmap = m_extensions->cmap();

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

        const unsigned int uc = getChar(string, i, len);

        if (QFontEngine::getTrueTypeGlyphIndex(cmap, uc) == 0)

            return false;

    }

    return true;

}

QByteArray QFontEngineS60::getSfntTable(uint tag) const

{

    return m_extensions->getSfntTable(tag);

}

QFontEngine::Type QFontEngineS60::type() const

{

    return QFontEngine::S60FontEngine;

}

void QFontEngineS60::getCharacterData(glyph_t glyph, TOpenFontCharMetrics& metrics, const TUint8*& bitmap, TSize& bitmapSize) const

{

    // Setting the most significant bit tells GetCharacterData

    // that 'code' is a Glyph ID, rather than a UTF-16 value

    const TUint specialCode = (TUint)glyph | 0x80000000;

    const CFont::TCharacterDataAvailability availability =

            m_activeFont->GetCharacterData(specialCode, metrics, bitmap, bitmapSize);

    const glyph_t fallbackGlyph = '?';

    if (availability != CFont::EAllCharacterData) {

        const CFont::TCharacterDataAvailability fallbackAvailability =

                m_activeFont->GetCharacterData(fallbackGlyph, metrics, bitmap, bitmapSize);

        Q_ASSERT(fallbackAvailability == CFont::EAllCharacterData);

    }

}

QT_END_NAMESPACE