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Diffstat (limited to 'TODO')
| -rw-r--r-- | TODO | 31 |
1 files changed, 31 insertions, 0 deletions
@@ -34,6 +34,37 @@ Document-level work --copy-attachments-from to preserve these. What will the strategy be for deduplicating in the automatic case? +Text Appearance Streams +======================= + +This is a list of known issues with text appearance streams and things +we might do about it. + +* For variable text, the spec says to pull any resources from /DR that + are referenced in /DA but if the resource dictionary already has + that resource, just use the one that's there. The current code looks + only for /Tf and adds it if needed. We might want to instead merge + /DR with resources and then remove anything that's unreferenced. We + have all the code required for that in ResourceFinder except + TfFinder also gets the font size, which ResourceFinder doesn't do. + +* There are things we are missing because we don't look at font + metrics. The code from TextBuilder (work) has almost everything in + it that is required. Once we have knowledge of character widths, we + can support quadding and multiline text fields (/Ff 4096), and we + can potentially squeeze text to fit into a field. For multiline, + first squeeze vertically down to the font height, then squeeze + horizontally with Tz. For single line, squeeze horizontally with Tz. + If we use Tz, issue a warning. + +* When mapping characters to widths, we will need to care about + character encoding. For built-in fonts, we can create a map from + Unicode code point to width and then go from the font's encoding to + unicode to the width. Get rid of "ugly switch statements" in + QUtil.cc and replace with static map initializers. See + misc/character-encoding/ (not on github) and font metric information + for the 14 standard fonts in my local pdf-spec directory. + Fuzz Errors =========== |