Creating CGFont from PDF Tf operator
Creating CGFont from PDF Tf operator
- Subject: Creating CGFont from PDF Tf operator
- From: Graham Cox <email@hidden>
- Date: Tue, 27 Aug 2013 14:46:02 +0200
OK, now I'm stumped.
Parsing a PDF, I need to handle the Tf (set font) operator. The font situation in PDF files is inordinately complicated, and reading the spec alone is not really leading to the light-bulb moment.
Basically, when I get the Tf operator, I need to end up with a CGFontRef I can use. I see a number of CGFontCreate… methods, none of which really fit anything I can see in the PDF spec itself. Perhaps CGFontCreateWithDataProvider is the "magic bullet" that just works behind the scenes to make sense of the almost innumerable PDF variations, but I can't see how I even get to the point where I could use it.
For example, one of my test files has a Tf operator that references a Font resource C2_0, which returns a dictionary object like this:
2013-08-27 12:08:10.303 PDFParser[43098:303] PDF Dictionary {
2013-08-27 12:08:10.303 PDFParser[43098:303] 'BaseFont'=[Name]'JOZTES+DFHei-Lt-HK-BF',
2013-08-27 12:08:10.303 PDFParser[43098:303] 'DescendantFonts'=[Array],
2013-08-27 12:08:10.304 PDFParser[43098:303] 'Encoding'=[Name]'Identity-H',
2013-08-27 12:08:10.304 PDFParser[43098:303] 'Subtype'=[Name]'Type0',
2013-08-27 12:08:10.304 PDFParser[43098:303] 'ToUnicode'=[Stream],
2013-08-27 12:08:10.304 PDFParser[43098:303] 'Type'=[Name]'Font',
2013-08-27 12:08:10.304 PDFParser[43098:303] };
I see this in the PDF spec; it's just one among many possible font types and formats, but I have no idea how to go from this to a CGFontRef.
Has anyone got any pointers or sample code on how the Tf operator should be handled in general?
--Graham
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