[Poppler-bugs] [Bug 105772] [PATCH] Arthur support for Type3 fonts

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105772

--- Comment #4 from oliver.sander at tu-dresden.de ---
>> - Why white?  Why not any other color?
> Because the code is buggy 

I'd happily try to fix the code, if somebody tells me what the startPage method
is supposed to do.

>> - Apparently the method is rarely called: The renderToArthur method
>>   in file poppler-page.cc, for example, does not call it.

> Are you sure about that? renderToArthur calls displayPageSlice that calls displaySlice that calls createGfx that calls Gfx constructor with pagenum that calls startPage

Well, I said 'rarely', not 'never'. :-)  In particular, I had to make the
renderToImage method fill the page with the page color, to get a background at
all (in 7e844eae94bc4eda1c6dcc3460840b25f4ca7898) The code in startPage didn't
seem to have any effect.  But I readily admit that I was never quite sure what
the proper location is for the code that initializes the page background.

Tangentially related: What is the precise meaning of the IgnorePaperColor flag?
 Does it mean 'make the background transparent'?

>> - Most importantly: We want to use ArthurOutputDev to render type3
>>  glyphs.  But they should have a transparent background, or rather,
>>  no background at all.

> I don't understand this reasoning.

The type3 code in the attached patch is partially cargo-culted from the cairo
backend.  It creates new ArthurOutputDev and Gfx objects for each glyph, and
uses them to render a single glyph into a QPicture.  The cairo backend calls
startPage on the output device, which in the case of the ArthurOutputDev leads
to the effect that each glyph has a white rectangular background.  You will
notice that when rendering type3 text on a non-white background.

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