2012/5/8 Michael W <mwil...@uccs.edu>:
> Sure, but I mean, is there a better way to get at a dc<%>'s cairo
> context than (require racket/draw/private/local) ? From what I
> understand, those areas aren't meant to be used by third-party
> libraries, and definitely not by planet packages. Not all dc<%>s
> are even backed by cairo contexts...
I believe you want get-handle. It will give you the surface of a bitmap,
and you can then get a context.
(let* ([bitmap (make-bitmap WIDTH HEIGHT)] ; works
[filename
"/Users/soegaard/Dropbox/GitHub/this-and-that/racket-poppler/bla.pdf"]
[document (poppler_document_new_from_file (string-append
"file:" filename) #f #f)]
[page (poppler_document_get_page document 0)]
[surface (send bitmap get-handle)]
[context (cairo_create surface)])
(cairo_scale context 2.0 2.0)
(poppler_page_render page context)
(make-object image-snip% bitmap))
This example is from
https://github.com/soegaard/this-and-that/blob/master/racket-poppler/racket-poppler.rkt
/Jens Axel
>
> 16 minutes ago, Eli Barzilay wrote:
>> Three hours ago, Michael W wrote:
>> >
>> > I'm not rasterizing to a bitmap% or anything like that. Instead,
>> > I'm asking poppler to draw directly to the dc<%>'s cairo context
>> > (Eli and Matthew are probably cringing), which means that you can
>> > render to arbitrary dc<%> objects at the cost of being much more
>> > hacky than your version.
>>
>> I don't know about "hacky" -- it just sounds like it'll invoke the
>> library for every redraw, which would be overall slower than going
>> through a bitmap that saves the results.
>>
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Jens Axel Søgaard
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