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Font cache

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Jakub Melka
2019-04-12 19:17:19 +02:00
parent 51b2ccacec
commit 90767ddfa5
10 changed files with 163 additions and 22 deletions
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43
PdfForQtLib/sources/pdffont.h
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@ -213,7 +213,7 @@ public:
/// Creates new realized font from the standard font. If font can't be created,
/// then exception is thrown.
static PDFRealizedFontPointer createRealizedFont(const PDFFont* font, PDFReal pixelSize);
static PDFRealizedFontPointer createRealizedFont(PDFFontPointer font, PDFReal pixelSize);
private:
/// Constructs new realized font
@ -235,7 +235,7 @@ public:
/// Realizes the font (physical materialization of the font using pixel size,
/// if font can't be realized, then empty QRawFont is returned).
/// \param fontSize Size of the font
virtual PDFRealizedFontPointer getRealizedFont(PDFReal fontSize) const = 0;
virtual PDFRealizedFontPointer getRealizedFont(PDFFontPointer font, PDFReal fontSize) const = 0;
/// Returns text using the font encoding
/// \param byteArray Byte array with encoded string
@ -268,7 +268,7 @@ public:
encoding::EncodingTable encoding);
virtual ~PDFSimpleFont() override = default;
virtual PDFRealizedFontPointer getRealizedFont(PDFReal fontSize) const override;
virtual PDFRealizedFontPointer getRealizedFont(PDFFontPointer font, PDFReal fontSize) const override;
virtual QString getTextUsingEncoding(const QByteArray& byteArray) const override;
protected:
@ -312,6 +312,43 @@ public:
virtual FontType getFontType() const override;
};
/// Font cache which caches both fonts, and realized fonts. Cache has individual limit
/// for fonts, and realized fonts.
class PDFFontCache
{
public:
inline explicit PDFFontCache(size_t fontCacheLimit, size_t realizedFontCacheLimit) :
m_fontCacheLimit(fontCacheLimit),
m_realizedFontCacheLimit(realizedFontCacheLimit),
m_document(nullptr)
{
}
/// Sets the document to the cache. Whole cache is cleared.
/// \param document Document to be setted
void setDocument(const PDFDocument* document);
/// Retrieves font from the cache. If font can't be accessed or created,
/// then exception is thrown.
/// \param fontObject Font object
PDFFontPointer getFont(const PDFObject& fontObject) const;
/// Retrieves realized font from the cache. If realized font can't be accessed or created,
/// then exception is thrown.
/// \param font Font, which should be realized
/// \param size Size of the font (in pixels)
PDFRealizedFontPointer getRealizedFont(const PDFFontPointer& font, PDFReal size) const;
private:
const size_t m_fontCacheLimit;
const size_t m_realizedFontCacheLimit;
mutable QMutex m_mutex;
const PDFDocument* m_document;
mutable std::map<PDFObjectReference, PDFFontPointer> m_fontCache;
mutable std::map<std::pair<PDFFontPointer, PDFReal>, PDFRealizedFontPointer> m_realizedFontCache;
};
} // namespace pdf
#endif // PDFFONT_H