I know it's incorrect because it says the first glyph ("&") horizontally intersects the second ("\u02d9"), which you can see isn't true when you view the PDF in a PDF reader.
#Fontforge extract font from pdf code#
What is the "ground truth" bounding box positioning for these 10 glyphs, in device space? My current code produces the following, but it's incorrect. This example PDF I've created has 10 glyphs.There are many moving parts here, and I've found it's quite hard to debug. that might be considered "outside" the bounding box in other applications. Each glyph is drawn independently.Īlso, note that I'm defining bounding box as "the smallest box that can contain all the drawn parts of the glyph." There's no need to ignore the ascenders/descenders/etc. As such, one nice constraint is that I can assume glyphs aren't drawn together in the same Tj/TJ operator. My specific application is extracting the musical semantics from a vector PDF of sheet music. For my purposes, I need more precise positioning. I realize the PDF FontDescriptor includes a rough bounding box for each embedded font, but that's a composite of all glyphs in the font - i.e., the smallest bounding box that fits all glyphs in the font. This involves keeping track of the CTM, drawing/positioning PDF instructions, etc., but also calculating the boundaries of every specific glyph in "glyph space" (using the information from the GLYF tables in the embedded fonts). Thus each two bytes of the string correspond to a glyph which will be mapped using the FontFile2 (TrueType fontfile, object reference: 9 0 R) fontprogram referenced in the fontdescriptor of the Type0 font's descendantfont.I'm trying to calculate the exact bounding box of every text glyph in a vector PDF. in PDF's syntax for hexstrings) with a Identity-H encoding. In the case where the Type0 variety font is used (on the second line which says "14.99 m2"), the text content is embedded in the content stream as a hex-encoded string (i.e. The page's content stream uses both these fonts on different parts of the text. How do I extract both these fonts using a fontforge script's Open() function?ĮDIT: As advised by Mike 'Pomax' Kamermans, I'll go a little into why both these fonts are required. Curiously their BaseFont names happen to be the same i.e "ArialMT".
One happens to be of type TrueType and the other of Type0. I have this peculiar single-paged pdf which contains a content stream using two different font objects.
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