an arrray of 4 items representing a rectangle may define its values as indirect references. when converting to a rectangle we pass a pdf token scanner to resolve any indirect references.
an %%eof for a pdf file may appear further back than the last 1024 bytes. this change doubles the search range. it also handles an empty differences array being defined for a font encoding.
we also remove the old approach to dependency injection from the code since we are now favouring static classes where possible.
the 3 font types mentioned are moved to the new fonts project, any referenced types are moved to the core project. most truetype classes are made public #8.
to make the project more useful and expose more usable classes we're rearchitecting in the following way. code used to read fonts from external file formats like truetype, adobe font metrics (afm) and adobe type 1 fonts are moving to a new project which doesn't reference most of the pdf logic. the shared logic is moving to a new flat-structured project called core. this is a sort-of onion type architecture, with core being the... core, fonts being the next layer of the onion, pdfpig itself the next. this will then support additional libraries/projects as outer layers of the onion as well as releasing standalone version of the font library as pdfbox does with fontbox.
since c# only produces a deflate stream when compressing it is necessary to provide the header and footer bytes to convert this to a valid zlib stream. this involves setting the correct 2 bytes for the header and appending a 4 byte adler checksum for the uncompressed data after the compressed data stream.
since we have verified the problem with the characters not appearing in acrobat reader isn't the checksum (other files also have invalid checksums but work) it seems likely the issue is with the os/2 table.
this change moves the logic for writing out the cmap table, the format 6 cmap sub-table, truetype table headers and the os/2 table into the classes themselves. now we can write an os/2 table and we've tested that the output matches the input, we can overwrite the os/2 table in order to work out which of the os/2 errors is causing our font to be invalid.
the writeable interface should be added to more and more parts of the codebase so that writing, editing and document creation become first class citizens rather than hardcoded additions.
this change also adds the macroman (1,0) cmap subtable to edited fonts so that it is present for consumers which expect it.
resources such as fonts are linked to page content operations using name labels, e.g. "/F1", these resource labels can be reassigned on different pages or inside form xobjects. we now clear the entire resource state for each page which is parsed and after form xobject operations which use resource dictionaries.
support both xobject and inline images. adds unsupported filters so that exceptions are only thrown when accessing lazily evaluated image.bytes property rather than when opening the page.
treat all warnings as errors.
package license url is deprecated in favour of package license expression but nuget doesn't seem to support expressions properly for published packages yet so we'll keep the deprecated url for the time being. having both url and expression causes the build to fail.
small obvious performance improvements for file header passing and getting the encoding information using the existing reverse name to code map.
- In the Letter class:
- Renaming 'Location' to 'StartBaseLine' and adding 'EndBaseLine' for better localisation of the letter ('Location' is also kept).
- Adding TextDirection.
