DLI Implementation and Reference Guide - Datalogics

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4.4 DLI Implementation and Reference Guide glyph identifiers in the embedded font stream. Text is input using the DLPDFCONTENT text calls as if using a single-byte font. Concepts and Facilities: Guide to the DL Pager Composition System Most TrueType and OpenType font files can be used to create either TrueType (singlebyte) or CIDType2 PDF fonts. In all cases, TrueType and CIDType2 fonts should be both embedded and subset to ensure reliable results when viewing and printing. In this chapter, the term "TrueType font" means a PDF TrueType font using a one-byte encoding, and the term "CIDType2 font" means a TrueType or OpenType font using GID values to access characters in the PDF file. Structure of a DLI Font A font is reflected in the structure DLPDFFONT. These structures are created by the font creation calls on a per-document basis. They may be used only within the document they were created with. Fonts are tracked within the document, and destroyed when the document is destroyed. Pointers to fonts are invalid after the destruction of their document. All DLPDFFONT structures for a given document will be released when that document is destroyed. Therefore, methods that use DLPDFFONT as a parameter (i.e. dlpdfcontenttext, dlpdfcontentwidetext, dlpdfcontenttextwidth, dlpdfcontentwidetextwidth) must be called before the document is destroyed Font Embedding Status The field DLPDFFONT->NotEmbedded will be TRUE only if a request was made to subset the font but the request procedure failed. If the font could not embed due to license restrictions (i.e. the request procedure functioned correctly, but the font itself is not licensed for embedding), an exception will be raised instead. Font Subsetting Status The field DLPDFFONT->SubSetMap will be NULL if a font is not subset. The field will be not NULL if a font is (or will be) subset.
Fonts 4.5 Font Attributes The field DLPDFFONT->RequestedFontAttr is a PDEFontAttrs structure. It is populated with the font attributes of the system font actually used to create the font, with the alterations requested by the calling application. Document EmbedFonts Flag If the document that contains the font carries the flag EmbedFonts (normally set by dlpdfdocembedfonts), then all fonts for that document will be embedded, regardless of the call used to create those fonts. All fonts will be subset unless either • they were created with a call to explicitly not embed the fonts, or • license restrictions prevent the font from being embedded. NOTE: If a font is available but not licensed for embedding, it will be created as a referenced font rather than an embedded font. An exception is not returned for this condition, but the NotEmbedded flag of the DLPDFFONT structure can be inspected after the dlpdfdocembedfonts call, if desired. Entries in the DLPDFFONT structure should not be altered after a font is created. Except for certain specific exceptions to be noted here, changes made to this structure will not be subsequently reflected in the font that is created and placed in the PDF document.
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