mirror of https://github.com/JakubMelka/PDF4QT.git
System font loading
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Jakub Melka
parent
90767ddfa5
commit
27fa4eb8aa
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@ -28,9 +28,176 @@
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#include <QMutex>
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#ifdef Q_OS_WIN
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#include "Windows.h"
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#pragma comment(lib, "Gdi32")
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#pragma comment(lib, "User32")
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#endif
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namespace pdf
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{
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/// Storage class for system fonts
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class PDFSystemFontInfoStorage
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{
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public:
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/// Returns instance of storage
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static const PDFSystemFontInfoStorage* getInstance();
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/// Loads font from descriptor
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/// \param descriptor Descriptor describing the font
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QByteArray loadFont(const FontDescriptor* descriptor) const;
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private:
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explicit PDFSystemFontInfoStorage();
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#ifdef Q_OS_WIN
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/// Callback for enumerating fonts
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static int CALLBACK enumerateFontProc(const LOGFONT* font, const TEXTMETRIC* textMetrics, DWORD fontType, LPARAM lParam);
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/// Retrieves font data for desired font
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static QByteArray getFontData(const LOGFONT* font, HDC hdc);
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struct FontInfo
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{
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QString faceName;
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LOGFONT logFont;
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TEXTMETRIC textMetric;
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};
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struct CallbackInfo
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{
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PDFSystemFontInfoStorage* storage = nullptr;
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HDC hdc = nullptr;
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};
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std::vector<FontInfo> m_fontInfos;
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#endif
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};
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const PDFSystemFontInfoStorage* PDFSystemFontInfoStorage::getInstance()
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{
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static PDFSystemFontInfoStorage instance;
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return &instance;
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}
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QByteArray PDFSystemFontInfoStorage::loadFont(const FontDescriptor* descriptor) const
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{
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QByteArray result;
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#ifdef Q_OS_WIN
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HDC hdc = GetDC(NULL);
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// Exact match for font, if font can't be exact matched, then match font family
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// and try to set weight
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QString fontFamily = QString::fromLatin1(descriptor->fontFamily);
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for (const FontInfo& fontInfo : m_fontInfos)
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{
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if (fontInfo.faceName.contains(fontFamily) &&
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fontInfo.logFont.lfWeight == descriptor->fontWeight &&
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fontInfo.logFont.lfItalic == (descriptor->italicAngle != 0.0 ? TRUE : FALSE))
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{
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result = getFontData(&fontInfo.logFont, hdc);
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if (!result.isEmpty())
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{
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break;
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}
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}
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}
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// Match for font family
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if (result.isEmpty())
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{
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for (const FontInfo& fontInfo : m_fontInfos)
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{
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if (fontInfo.faceName.contains(fontFamily))
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{
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LOGFONT logFont = fontInfo.logFont;
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logFont.lfWeight = descriptor->fontWeight;
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logFont.lfItalic = (descriptor->italicAngle != 0.0 ? TRUE : FALSE);
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result = getFontData(&logFont, hdc);
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if (!result.isEmpty())
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{
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break;
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}
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}
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}
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}
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ReleaseDC(NULL, hdc);
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#endif
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return result;
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}
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PDFSystemFontInfoStorage::PDFSystemFontInfoStorage()
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{
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#ifdef Q_OS_WIN
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LOGFONT logfont;
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std::memset(&logfont, 0, sizeof(logfont));
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logfont.lfCharSet = DEFAULT_CHARSET;
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logfont.lfFaceName[0] = 0;
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logfont.lfPitchAndFamily = 0;
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HDC hdc = GetDC(NULL);
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CallbackInfo callbackInfo{ this, hdc};
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EnumFontFamiliesEx(hdc, &logfont, &PDFSystemFontInfoStorage::enumerateFontProc, reinterpret_cast<LPARAM>(&callbackInfo), 0);
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ReleaseDC(NULL, hdc);
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#endif
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}
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#ifdef Q_OS_WIN
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int PDFSystemFontInfoStorage::enumerateFontProc(const LOGFONT* font, const TEXTMETRIC* textMetrics, DWORD fontType, LPARAM lParam)
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{
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if ((fontType & TRUETYPE_FONTTYPE) && (font->lfCharSet == ANSI_CHARSET))
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{
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CallbackInfo* callbackInfo = reinterpret_cast<CallbackInfo*>(lParam);
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FontInfo fontInfo;
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fontInfo.logFont = *font;
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fontInfo.textMetric = *textMetrics;
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fontInfo.faceName = QString::fromWCharArray(font->lfFaceName);
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callbackInfo->storage->m_fontInfos.push_back(qMove(fontInfo));
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// For debug purposes only!
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#if 0
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QByteArray byteArray = getFontData(font, callbackInfo->hdc);
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qDebug() << "Font: " << QString::fromWCharArray(font->lfFaceName) << ", italic = " << font->lfItalic << ", weight = " << font->lfWeight << ", data size = " << byteArray.size();
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#endif
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}
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return TRUE;
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}
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QByteArray PDFSystemFontInfoStorage::getFontData(const LOGFONT* font, HDC hdc)
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{
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QByteArray byteArray;
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if (HFONT fontHandle = ::CreateFontIndirect(font))
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{
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HGDIOBJ oldFont = ::SelectObject(hdc, fontHandle);
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DWORD size = ::GetFontData(hdc, 0, 0, nullptr, 0);
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if (size != GDI_ERROR)
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{
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byteArray.resize(static_cast<int>(size));
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::GetFontData(hdc, 0, 0, byteArray.data(), byteArray.size());
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}
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::SelectObject(hdc, oldFont);
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::DeleteObject(fontHandle);
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}
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return byteArray;
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}
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#endif
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PDFFont::PDFFont(FontDescriptor fontDescriptor) :
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m_fontDescriptor(qMove(fontDescriptor))
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{
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@ -81,6 +248,9 @@ private:
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/// For embedded fonts, this byte array contains embedded font data
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QByteArray m_embeddedFontData;
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/// For system fonts, this byte array contains system font data
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QByteArray m_systemFontData;
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/// Instance of FreeType library assigned to this font
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FT_Library m_library;
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@ -198,16 +368,16 @@ const PDFRealizedFontImpl::Glyph& PDFRealizedFontImpl::getGlyphForUnicode(QChar
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{
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Glyph glyph;
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FT_Outline_Funcs interface;
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interface.delta = 0;
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interface.shift = 0;
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interface.move_to = PDFRealizedFontImpl::outlineMoveTo;
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interface.line_to = PDFRealizedFontImpl::outlineLineTo;
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interface.conic_to = PDFRealizedFontImpl::outlineConicTo;
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interface.cubic_to = PDFRealizedFontImpl::outlineCubicTo;
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FT_Outline_Funcs glyphOutlineInterface;
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glyphOutlineInterface.delta = 0;
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glyphOutlineInterface.shift = 0;
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glyphOutlineInterface.move_to = PDFRealizedFontImpl::outlineMoveTo;
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glyphOutlineInterface.line_to = PDFRealizedFontImpl::outlineLineTo;
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glyphOutlineInterface.conic_to = PDFRealizedFontImpl::outlineConicTo;
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glyphOutlineInterface.cubic_to = PDFRealizedFontImpl::outlineCubicTo;
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checkFreeTypeError(FT_Load_Glyph(m_face, glyphIndex, FT_LOAD_NO_BITMAP | FT_LOAD_NO_HINTING));
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checkFreeTypeError(FT_Outline_Decompose(&m_face->glyph->outline, &interface, &glyph));
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checkFreeTypeError(FT_Outline_Decompose(&m_face->glyph->outline, &glyphOutlineInterface, &glyph));
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glyph.glyph.closeSubpath();
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glyph.advance = !m_isVertical ? m_face->glyph->advance.x : m_face->glyph->advance.y;
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glyph.advance *= FORMAT_26_6_MULTIPLIER;
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@ -292,8 +462,22 @@ PDFRealizedFontPointer PDFRealizedFont::createRealizedFont(PDFFontPointer font,
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}
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else
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{
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// TODO: Support non-embedded fonts
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throw PDFParserException(PDFTranslationContext::tr("Only embedded fonts are supported."));
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const PDFSystemFontInfoStorage* fontStorage = PDFSystemFontInfoStorage::getInstance();
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impl->m_systemFontData = fontStorage->loadFont(descriptor);
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if (impl->m_systemFontData.isEmpty())
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{
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// TODO: Upravit vyjimky do separatniho souboru
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throw PDFParserException(PDFTranslationContext::tr("Can't load system font '%1'.").arg(QString::fromLatin1(descriptor->fontName)));
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}
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PDFRealizedFontImpl::checkFreeTypeError(FT_Init_FreeType(&impl->m_library));
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PDFRealizedFontImpl::checkFreeTypeError(FT_New_Memory_Face(impl->m_library, reinterpret_cast<const FT_Byte*>(impl->m_systemFontData.constData()), impl->m_systemFontData.size(), 0, &impl->m_face));
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PDFRealizedFontImpl::checkFreeTypeError(FT_Select_Charmap(impl->m_face, FT_ENCODING_UNICODE));
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PDFRealizedFontImpl::checkFreeTypeError(FT_Set_Pixel_Sizes(impl->m_face, 0, qRound(pixelSize)));
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impl->m_isVertical = impl->m_face->face_flags & FT_FACE_FLAG_VERTICAL;
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impl->m_isEmbedded = false;
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result.reset(new PDFRealizedFont(implPtr.release()));
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}
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return result;
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