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API Shakeup work
----------------
Patch? Reviewed?
yes yes user data (was Re: [cairo] Patch improving fallbacks)
cairo_paint
yes yes setters and getters
cairo_current_matrix
Renaming the terms of the rendering equation
Making set_source consistent
Eliminating cairo_show_surface
cairo_mask
cairo_begin_group, cairo_end_group, cairo_get_group
yes yes cairo_output_stream_t and cairo_surface_finish()
cairo_create and eliminating cairo_set_target_surface
cairo_fill_preserve, cairo_stroke_preserve, cairo_clip_preserve
default matrix
cairo_current_path -> cairo_copy_path_data
cairo_surface_finish, cairo_surface_flush
cairo_<device>_surface_mark_dirty
Eliminating cairo_copy
Eliminating cairo_surface_set_repeat/matrix/filter
A hidden offset for the xlib backend
cairo_stroke_path -> cairo_stroke_to_path
Simplifying the operator set
Abbreviation hunt: cairo_init_clip and cairo_concat_matrix
Consistent error handling for all objects
* Add support for non-antialiased rendering. API ?
* Clean up the cache code a bit, (there is at least one redundant
level of cacheing, and there are some minor style issues).
* Add CAIRO_FILL_RULE_INVERSE_WINDING and CAIRO_FILL_RULE_INVERSE_EVEN_ODD
* Fix clipping to work for all operators. The equation we have come up
with is:
((src Op dest) In clip) Add (dest Out clip)
* Replace PNG backend with an image_surface function to save a PNG
image.
* Clean up the API in preparation for freezing and release.
* Make a more interesting PS backend, (other than the current
"giant-image for every page" approach).
* Figure out what to do with DPI for image/png backends.
* Change stroke code to go through one giant polygon. This will fix
problems with stroking self-intersecting paths.
* Re-work the backend clipping interface to use geometry rather than
images.
* Fix the intersection problem, (see reference to Hobby's paper
mentioned in cairo_traps.c).
* Add a new cairo_text_glyphs function (a sort of bridge between the
toy and the real text API):
> void
> cairo_text_glyphs (cairo_t *cr, const unsigned char *utf8,
> cairo_glyph_t *glyphs, int *num_glyphs);
>
> with num_glyphs as an input-output parameter. The behavior of this
> function would be such that calling:
>
> cairo_text_glyphs (cr, string, glyphs, &num_glyphs);
> cairo_show_glyphs (cr, glyphs, num_glyphs);
>
> would be equivalent too:
>
> cairo_show_text (cr, string);
>
> as long as the original size of glyphs/num_glyphs was large
> enough.
* Implement dashing for cairo_curve_to.
* Implement support for programmatic patterns, (ie. figure out how to
do gradients the Right Way).
* Implement cairo_arc_to.
* Re-implement the trapezoid rasterization algorithm according to the
new "specification".
* Stroking closed, degenerate paths should still draw caps. Round
caps are easy; square should probably draw an axis-aligned square.
* It would be nice if the user had a mechanism to reliably draw custom
caps. One approach here would be to provide the coordinates of the
butt cap faces so that the user can append seamless caps to the
current path. We may also need to provide the coordinates of the
faces of every dash as well.
* Should add geometry pruning as appropriate.
* We need a way to get at the image data after something
like cairo_surface_create_similar with the image backend.
* Three suggestions from Owen that will help GTK+ performance:
- The ability have an additional rectangle-list clip in the
Xlib surface. Frequently during an expose event, GTK+ is
drawing L shaped areas
XXXXXX
X.....
X.....
And passing the real clip to the server is going to save
a lot of pixel operations that will be thrown away.
- The ability to pass in a width/height to cairo_xlib_surface_create()
to avoid a round-trip. (Round-trips are bad to the point where
querying the the server is something you don't want to do in
production software)
- More of a future thing, the ability to hint to to cairo that
the contents of the Xlib surface passed to
cairo_xlib_surface_create() are a solid fill ... this is
very much the normal case for GTK+ usage and allows for
big optimization in the no-RENDER case.
(see http://mail.gnome.org/archives/gtk-devel-list/2003-March/msg00045.html
* Verification, profiling, optimization.
centi_unfinished.svg may provide a good test case.
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