[cairo] User font take 2
keithp at keithp.com
Mon May 8 15:34:23 PDT 2006
On Mon, 2006-05-08 at 11:35 -0700, Carl Worth wrote:
> And I think I'd be more inclined to return a cairo_surface_t* instead
> of a cairo_t*.
I thought the return of a cairo_t was somewhat clever -- it could be
prescaled to provide the desired dynamic range to avoid losing precision
in glyph scaling.
> 1) cairo-font-subset.c
> Used only by cairo-pdf-surface.c and based on
> cairo_unscaled_font_t. Uses a callback structure and is what
> krh had written before making the original callback-based user
> font proposal.
remember that cairo_unscaled_font_t isn't universally supported by font
> 2) cairo-ps-surface.c
> Obviously used only by this surface and is based on
> cairo_scaled_font_t. Was written by keithp before making the
> non-callback counter-proposal for user font stuff.
> 3) cairo-svg-surface.c
> Obviously used only by this surface. Appeared suddenly this
> weekend by emmanuel, coder extraordinaire. Credited as being
> an adaptation of keithp's work in cairo-ps-surface.c.
I'd like a general wrapper above these two that used
cairo_unscaled_font_t where available so that we don't replicate glyphs
in the output file.
> So, before I go and make a 4th implementation for cairo-pdf-surface.c
> I'll try to come up with something that will at least allow some
> sharing. And I'll do that with an eye on the latest user font
> proposals to see how the interfaces might play out. (The font
> subsetting and user font use cases are not identical, but I think
> there might be enough similarities to be useful.)
I think the user font stuff is just another font back-end and should
expose itself using the existing font backend APIs.
keith.packard at intel.com
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