[Ffmpeg-devel] [PATCH] drawtext.c: 08 fix process measure and cache code

[Gustavo Sverzut Barbieri]

This fix one of most broken code present in drawtext: measure and
cache of glyphs in order to draw them on picture. This also fix
background drawing for single-line strings and avoid out-of-buffer
drawing.

It defines 2 extra functions to help code readability:

 - get_kerning() given 2 char index (current and previous) get the
pixel offset for kerning.
 - get_offset_based_on_previous(): given characters and context, check
if kerning is possible and use get_kerning().

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Gustavo Sverzut Barbieri
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