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Make it possible to use drawings for clipping with \clip and \iclip.
parse_tag was extended to parse drawings in \clip or \iclip tags in case
parsing them as rectangular clips fails. These clip drawings are later
rasterized and used for blending bitmaps, just after bitmaps are
assembled into a list in render_text. Currently, the cache is not
utilized for storing the parsed drawings or blended bitmaps.
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Introduce functionality for providing a message callback that is used
for passing messages to the controlling application instead of simply
printing them to standard output. The function pointer to the callback
is stored in the ass_library_t instance. ass_msg needs access to it, so
in many places the library instance needs to be passed around now.
The default behavior is the old one: messages of MSGL_INFO or lower
are printed to the standard output, prefixed with "[ass]".
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Finally implement the drawing mode, which allows drawing of custom
vector graphics. Drawings are intercepted in ass_render_event; a hash
of the drawing string is generated which is then used for looking
up drawings and bitmaps of drawings in the cache. The drawings
itself are "fake" glyphs. They are created by parsing the simple
drawing description language, evaluating the curves described (lines,
cubic beziers and/or a special kind of b-splines) and creating vector
outlines. Afterwards, these drawings are (with a few exceptions, e.g.
ascender/descender) exactly handled like regular glyphs.
Support for vector clippings is still missing, but otherwise the
implementation should be complete and compatible with VSFilter.
The libass integration of the drawing parsing/processing code is still a
bit sketchy and should be refactored.
History:
WIP: Drawing mode infrastructure
WIP: Drawing tokenizer
WIP: Parse drawing tokens, call evaluators
WIP: Bezier/b-spline evaluator
WIP: Final pieces for the drawing mode
WIP: Heavy modifications to the drawing parser/tokenizer
WIP: Dynamic outline memory allocation
WIP: Drawing position fixes
WIP: more drawing position fixup (similar to VSFilter now)
WIP: Lots of cleanup and fixes for drawings.
WIP: Drawing mode integration into ass_render_event
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