Re: [ft-devel] Direct Rendering with Win32

[David Turner]

Hello Alex,

what you want to achieve is not very clear, but if you want to ensure 
that vectors are sent to your printers, instead
of bitmaps, through GDI, I can only suggest the following:

A/ load the glyphs as outlines (i.e. using FT_LOAD_NO_BITMAP when 
calling FT_Load_Glyph)

B/ if face->glyph->format is FT_GLYPH_FORMAT_OUTLINE, you can then call 
FT_Outline_Decompose
to decompose the glyph vector into a series o line and curve segments.

C/ the callbacks provided to FT_Outline_Decompose should call the 
corresponding GDI functions, i.e.
MoveToEx, LineTo, PolyBezierTo, CloseFigure. You might need to convert 
quadratic beziers to
cubic ones, but this is rather trivial.

D/ don't forget to bracket these calls with BeginPath and EndPath to get 
filled glyphs.

Hope this helps,

- David Turner
- The FreeType Project (www.freetype.org)

Murillo, Alex a écrit :
> Hello,
>
> I am attempting to render freetype glyphs directly into a windows 
> device context. In other words, I do not want glyphs rendered as 
> bitmaps because in print scenarios the print spooler becomes 
> exponentially larger than the original document size. Specifically, in 
> our application, text rendering uses the standard freetype mechanism 
> (under windows), which is to lookup the glyph, render the glyph, then 
> take the returned bitmap and BitBlt (GDI API) the bitmap into a memory 
> compatible device context (which is based on an actual device context 
> e.g. screen or printer…). As you might already recognize, in a print 
> scenario we simply reuse the display code to render text into the 
> printer device (instead of the screen).
>
> However, as stated before, this is the source of our problem because 
> ultimately the operation performed against the printer device is a 
> raster operation and not a vector operation. In my limited 
> understanding, the raster operation results in bitmaps actually pushed 
> into the postscript and not vector commands, which results in large 
> printer spool files (I have confirmed in testing). Incidentally, I 
> have scoured the web and this mail group but have not seen anyone who 
> has experienced this issue on any level. Nor have I have discovered 
> anyone who has made any attempt to direct render the glyphs into a 
> windows device context. Ironically, I have seen other font engines 
> that use freetype as their underlying font library, which seem to 
> offer this functionality. So, I have to believe this is possible. I’m 
> still searching but hope someone here has an answer, as I am running 
> out of options.
>
> Thanks Alex
>
> ------------------------------------------------------------------------
>
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>   


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