Cairo exports and more (was Re: [cairo] Re: Munging header
files for export (and other) attributes)
otaylor at redhat.com
Sun Sep 4 16:13:31 PDT 2005
On Sun, 2005-09-04 at 17:15 -0400, Owen Taylor wrote:
> * The portability stuff is mostly good. I think rather than
> hacking up the PDF and PS backends to build without font
> support, it would be better to not build them until we
> get font embedding working with win32 fonts. It's not
> that much work.
I took a look at this some. The implications for the font interfaces
is pretty straightforward. What I did was add:
/* the font backend interface */
#define CAIRO_SFNT_TABLE_NAME(a,b,c,d) \
((((uint32_t)(a)) << 24) | \
(((uint32_t)(b)) << 16) | \
(((uint32_t)(c)) << 8) | \
/* Enumeration of tables from the TrueType format that we are
* interested in. Backends can be requested to return one of these
CAIRO_SFNT_TABLE_CMAP = CAIRO_SFONT_TABLE_NAME('c', 'm', 'a', 'p'),
* @font: a #cairo_unscaled_font_t
* @table: the table to load from the font.
* @buffer: location to store a pointer to a newly allocated buffer,
* or %NULL. If %NULL, the function will only store the length
* of the table in @size, and not actually retrieve it.l
* If non-%NULL and function succeeds, the pointer stored here
* must be freed with free().
* @size: location to store the size of the table
* Loads a table from a font in SFNT format. (That is, a TrueType
* or OpenType/CFF font)
* Return value: %CAIRO_STATUS_SUCCESS, %CAIRO_INT_STATUS_UNSUPPORTED,
* or another error like %CAIRO_STATUS_NO_MEMORY.
_cairo_unscaled_font_load_sfnt_table (cairo_unscaled_font_t *font,
unsigned char **buffer,
* @scaled_font: a #cairo_scaled_font_t
* Gets the #cairo_unscaled_font_t corresponding to @scaled_font, if any.
* If the font backend does not support the interfaces for font embedding,
* may return %NULL.
* Return value: a #cairo_unscaled_font_t, or %NULL. This value is owned by the
* scaled font. If you want to keep a reference to it, you must
* call _cairo_unscaled_font_reference().
_cairo_scaled_font_get_unscaled_font (cairo_scaled_font_t *scaled_font);
I think this is sufficient, though you might also want some sort of
_cairo_unscaled_font_get_capabilities() function if we start adding
virtual functions to support other font formats.
(You can call
load_sfnt_table(unscaled, CAIRO_SFNT_TABLE_HEAD, NULL, &size); to check
if the font is a SFNT, but that's a little ugly.)
However, when I started looking at making cairo-font-subset.c actually
use this stuff, it became clear that it was going to *majorly* conflict
with Kristian's outstanding Type1-embedding patch. So, it should probably
wait for that to land.
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