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// character_manager.cpp: implementation of the TFont class
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// for FreeType 2.
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//
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//////////////////////////////////////////////////////////////////////
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#include <qstringlist></qstringlist>
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#include <qfont></qfont>
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#include <qfontdatabase></qfontdatabase>
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#include <qfontmetrics></qfontmetrics>
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#include <qimage></qimage>
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#include <qpainterpath></qpainterpath>
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#include <qpainter></qpainter>
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#include <qrawfont></qrawfont>
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#include <vector></vector>
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#include <iostream></iostream>
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#include <string></string>
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#include "tpixelgr.h"
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#include "tfont.h"
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#include "tstroke.h"
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#include "tcurves.h"
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#include "traster.h"
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#include "tmathutil.h"
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#include "tvectorimage.h"
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using namespace std;
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//=============================================================================
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struct TFont::Impl {
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  bool m_hasKerning;
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  int m_hasVertical;
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  QFont m_font;
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  // XXX:cache a QFontMetrics m_metrics; ?
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  // XXX:cache a QRawFont m_raw; ?
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  //  KerningPairs m_kerningPairs;
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  Impl(const QString &family, const QString &style, int size);
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  ~Impl();
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  // void getChar();
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};
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//-----------------------------------------------------------------------------
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TFont::TFont(const wstring family, const wstring face, int size) {
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  m_pimpl = new Impl(QString::fromStdWString(family),
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                     QString::fromStdWString(face), size);
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}
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//-----------------------------------------------------------------------------
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TFont::~TFont() { delete m_pimpl; }
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//-----------------------------------------------------------------------------
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TFont::Impl::Impl(const QString &family, const QString &style, int size) {
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  m_font = QFont(family, size);
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  m_font.setBold(TFontManager::instance()->isBold(family, style));
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  m_font.setItalic(TFontManager::instance()->isItalic(family, style));
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}
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//-----------------------------------------------------------------------------
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TFont::Impl::~Impl() {}
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// returns the offset (advance of the cursor) for the current character
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TPoint TFont::drawChar(TVectorImageP &image, wchar_t charcode,
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                       wchar_t nextCharCode) const {
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  QRawFont raw(QRawFont::fromFont(m_pimpl->m_font));
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  QChar chars[2] = {charcode, nextCharCode};
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  quint32 indices[2];
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  int count = 2;
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  if (!raw.glyphIndexesForChars(chars, 2, indices, &count) || count < 1)
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    return TPoint(0, 0);
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  QPainterPath path = raw.pathForGlyph(indices[0]);
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  // empty glyph, nothing to do
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  if (path.elementCount() < 1) return getDistance(charcode, nextCharCode);
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  // force closing the last path
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  if (path.elementAt(path.elementCount() - 1).type !=
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      QPainterPath::MoveToElement) {
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    path.moveTo(0.0, 0.0);
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  }
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  int i, n = path.elementCount();
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  int strokes = 0;
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  std::vector<tthickpoint> points;</tthickpoint>
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  TThickPoint pts[4];
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  int nCubicPts = 0;
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  for (i = 0; i < n; i++) {
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    QPainterPath::Element e = path.elementAt(i);
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    e.y                     = -e.y;
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    switch (e.type) {
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    case QPainterPath::MoveToElement:
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      if (!points.empty()) {
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        if (points.back() != points.front()) {
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          points.push_back(0.5 * (points.back() + points.front()));
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          points.push_back(points.front());
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        }
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        TStroke *stroke = new TStroke(points);
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        stroke->setSelfLoop(true);
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        image->addStroke(stroke);
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        strokes++;
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        points.clear();
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      }
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      points.push_back(TThickPoint(e.x, e.y, 0));
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      break;
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    case QPainterPath::LineToElement: {
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      TThickPoint p0 = points.back();
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      TThickPoint p1 = TThickPoint(e.x, e.y, 0);
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      points.push_back((p0 + p1) * 0.5);
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      points.push_back(p1);
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      break;
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    }
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    case QPainterPath::CurveToElement:
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      pts[0]    = points.back();
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      pts[1]    = TThickPoint(e.x, e.y, 0);
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      nCubicPts = 2;
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      break;
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    case QPainterPath::CurveToDataElement:
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      pts[nCubicPts++] = TThickPoint(e.x, e.y, 0);
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      if (nCubicPts == 4) {
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        vector<tthickquadratic *=""> chunkArray;</tthickquadratic>
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        computeQuadraticsFromCubic(pts[0], pts[1], pts[2], pts[3], 0.09,
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                                   chunkArray);
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        for (int j = 0; j < chunkArray.size(); j++) {
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          points.push_back(chunkArray[j]->getP1());
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          points.push_back(chunkArray[j]->getP2());
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        }
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        nCubicPts = 0;
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      }
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      break;
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    }
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  }
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  if (strokes > 1) image->group(0, strokes);
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  return getDistance(charcode, nextCharCode);
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}
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//-----------------------------------------------------------------------------
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TPoint TFont::drawChar(QImage &outImage, TPoint &unused, wchar_t charcode,
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                       wchar_t nextCharCode) const {
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  QRawFont raw(QRawFont::fromFont(m_pimpl->m_font));
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  QChar chars[2] = {charcode, nextCharCode};
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  quint32 indices[2];
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  int count = 2;
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  if (!raw.glyphIndexesForChars(chars, 2, indices, &count) || count < 1) {
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    return TPoint(0, 0);
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  }
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  QImage image = raw.alphaMapForGlyph(indices[0], QRawFont::PixelAntialiasing);
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  if (image.format() != QImage::Format_Indexed8 &&
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      image.format() != QImage::Format_Alpha8)
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    throw TException(L"bad QImage format " + image.format());
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  QRectF boundingRect = raw.boundingRect(indices[0]);
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  outImage = QImage(image.width(), raw.ascent() + raw.descent(),
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                    QImage::Format_Grayscale8);
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  outImage.fill(255);
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  QPainter painter(&outImage);
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  painter.drawImage(0, boundingRect.top() + raw.ascent(), image);
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  return getDistance(charcode, nextCharCode);
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}
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//-----------------------------------------------------------------------------
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TPoint TFont::drawChar(TRasterCM32P &outImage, TPoint &unused, int inkId,
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                       wchar_t charcode, wchar_t nextCharCode) const {
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  QImage grayAppImage;
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  this->drawChar(grayAppImage, unused, charcode, nextCharCode);
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  int lx = grayAppImage.width();
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  int ly = grayAppImage.height();
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  outImage = TRasterCM32P(lx, ly);
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  outImage->lock();
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  assert(TPixelCM32::getMaxTone() == 255);
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  TPixelCM32 bgColor(0, 0, TPixelCM32::getMaxTone());
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  int ty = 0;
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  for (int gy = ly - 1; gy >= 0; --gy, ++ty) {
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    uchar *srcPix      = grayAppImage.scanLine(gy);
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    TPixelCM32 *tarPix = outImage->pixels(ty);
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    for (int x = 0; x < lx; ++x) {
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      int tone = (int)(*srcPix);
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      if (tone == 255)
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        *tarPix = bgColor;
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      else
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        *tarPix = TPixelCM32(inkId, 0, tone);
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      ++srcPix;
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      ++tarPix;
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    }
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  }
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  outImage->unlock();
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  return getDistance(charcode, nextCharCode);
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}
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//-----------------------------------------------------------------------------
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TPoint TFont::getDistance(wchar_t firstChar, wchar_t secondChar) const {
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  QFontMetrics metrics(m_pimpl->m_font);
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  return TPoint(metrics.width(QChar(firstChar)), 0);
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}
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//-----------------------------------------------------------------------------
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int TFont::getMaxWidth() const {
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  QFontMetrics metrics(m_pimpl->m_font);
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  return metrics.maxWidth();
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}
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//-----------------------------------------------------------------------------
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int TFont::getLineAscender() const {
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  QFontMetrics metrics(m_pimpl->m_font);
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  return metrics.ascent();
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}
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//-----------------------------------------------------------------------------
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int TFont::getLineDescender() const {
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  QFontMetrics metrics(m_pimpl->m_font);
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  return metrics.descent();
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}
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//-----------------------------------------------------------------------------
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int TFont::getLineSpacing() const {
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  QFontMetrics metrics(m_pimpl->m_font);
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  return metrics.lineSpacing();
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}
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//-----------------------------------------------------------------------------
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int TFont::getHeight() const {
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  QFontMetrics metrics(m_pimpl->m_font);
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  return metrics.height();
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}
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//-----------------------------------------------------------------------------
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int TFont::getAverageCharWidth() const {
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  QFontMetrics metrics(m_pimpl->m_font);
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  return metrics.averageCharWidth();
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}
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//-----------------------------------------------------------------------------
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bool TFont::hasKerning() const { return m_pimpl->m_font.kerning(); }
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//-----------------------------------------------------------------------------
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bool TFont::hasVertical() const {
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  // FIXME
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  return false;
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}
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//-----------------------------------------------------------------------------
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//=============================================================================
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//====================      TFontManager  =====================================
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//=============================================================================
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//---------------------------------------------------------
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struct TFontManager::Impl {
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  QFontDatabase *m_qfontdb;
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  bool m_loaded;
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  TFont *m_currentFont;
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  wstring m_currentFamily;
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  wstring m_currentTypeface;
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  int m_size;
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  // this option is set by library user when he wants to write vertically.
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  // In this implementation, if m_vertical is true and the font
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  // has the @-version, the library use it.
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  bool m_vertical;
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  Impl()
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      : m_qfontdb(NULL)
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      , m_loaded(false)
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      , m_currentFont(0)
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      , m_size(0)
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      , m_vertical(false) {}
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  ~Impl() { delete m_qfontdb; }
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};
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//---------------------------------------------------------
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TFontManager::TFontManager() { m_pimpl = new TFontManager::Impl(); }
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//---------------------------------------------------------
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TFontManager::~TFontManager() { delete m_pimpl; }
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//---------------------------------------------------------
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TFontManager *TFontManager::instance() {
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  static TFontManager theManager;
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  return &theManager;
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}
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//---------------------------------------------------------
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void TFontManager::loadFontNames() {
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  if (m_pimpl->m_loaded) return;
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  m_pimpl->m_qfontdb = new QFontDatabase;
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  if (m_pimpl->m_qfontdb->families().empty()) throw TFontLibraryLoadingError();
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  m_pimpl->m_loaded = true;
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}
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//---------------------------------------------------------
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void TFontManager::setFamily(const wstring family) {
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  if (m_pimpl->m_currentFamily == family) return;
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  QString qFamily      = QString::fromStdWString(family);
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  QStringList families = m_pimpl->m_qfontdb->families();
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  if (!families.contains(qFamily)) throw TFontCreationError();
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  m_pimpl->m_currentFamily = family;
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// XXX: if current style is not valid for family, reset it?
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// doing so asserts when chosing a font in the GUI
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#if 0
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  QStringList styles = m_pimpl->m_qfontdb->styles(qFamily);
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  if (styles.contains(QString::fromStdWString(m_pimpl->m_currentTypeface))) {
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    m_pimpl->m_currentTypeface = L"";
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  }
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#endif
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  delete m_pimpl->m_currentFont;
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  m_pimpl->m_currentFont = new TFont(
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      m_pimpl->m_currentFamily, m_pimpl->m_currentTypeface, m_pimpl->m_size);
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}
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//---------------------------------------------------------
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void TFontManager::setTypeface(const wstring typeface) {
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  if (m_pimpl->m_currentTypeface == typeface) return;
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  QString qTypeface  = QString::fromStdWString(typeface);
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  QStringList styles = m_pimpl->m_qfontdb->styles(
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      QString::fromStdWString(m_pimpl->m_currentFamily));
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  if (!styles.contains(qTypeface)) {
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    throw TFontCreationError();
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  }
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  m_pimpl->m_currentTypeface = typeface;
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  delete m_pimpl->m_currentFont;
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  m_pimpl->m_currentFont = new TFont(
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      m_pimpl->m_currentFamily, m_pimpl->m_currentTypeface, m_pimpl->m_size);
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}
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//---------------------------------------------------------
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void TFontManager::setSize(int size) {
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  if (m_pimpl->m_size == size) return;
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  m_pimpl->m_size = size;
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  delete m_pimpl->m_currentFont;
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  m_pimpl->m_currentFont = new TFont(
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      m_pimpl->m_currentFamily, m_pimpl->m_currentTypeface, m_pimpl->m_size);
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}
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//---------------------------------------------------------
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wstring TFontManager::getCurrentFamily() const {
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  return m_pimpl->m_currentFamily;
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}
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//---------------------------------------------------------
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wstring TFontManager::getCurrentTypeface() const {
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  return m_pimpl->m_currentTypeface;
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}
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//---------------------------------------------------------
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TFont *TFontManager::getCurrentFont() {
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  if (m_pimpl->m_currentFont) {
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    return m_pimpl->m_currentFont;
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  }
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  if (!m_pimpl->m_currentFont) {
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    loadFontNames();
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  }
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  assert(!m_pimpl->m_qfontdb->families().empty());
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  setFamily(m_pimpl->m_qfontdb->families().first().toStdWString());
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  return m_pimpl->m_currentFont;
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}
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//---------------------------------------------------------
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void TFontManager::getAllFamilies(vector<wstring> &families) const {</wstring>
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  QStringList qFamilies = m_pimpl->m_qfontdb->families();
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  families.clear();
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  families.reserve(qFamilies.count());
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  QStringList::const_iterator it = qFamilies.begin();
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  for (; it != qFamilies.end(); ++it) {
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    families.push_back(it->toStdWString());
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  }
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}
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//---------------------------------------------------------
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void TFontManager::getAllTypefaces(vector<wstring> &typefaces) const {</wstring>
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  typefaces.clear();
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  QStringList qStyles = m_pimpl->m_qfontdb->styles(
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      QString::fromStdWString(m_pimpl->m_currentFamily));
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  if (qStyles.empty()) return;
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  typefaces.reserve(qStyles.count());
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  QStringList::const_iterator it_typeface = qStyles.begin();
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  for (; it_typeface != qStyles.end(); ++it_typeface) {
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    typefaces.push_back(it_typeface->toStdWString());
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  }
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}
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//---------------------------------------------------------
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void TFontManager::setVertical(bool vertical) {}
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//---------------------------------------------------------
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bool TFontManager::isBold(const QString &family, const QString &style) {
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  return m_pimpl->m_qfontdb->bold(family, style);
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}
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//---------------------------------------------------------
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bool TFontManager::isItalic(const QString &family, const QString &style) {
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  return m_pimpl->m_qfontdb->italic(family, style);
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}