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from the NEWS:
* Optimizations:
- Rework PangoLayout algorithms to avoid calling a recursive call to
pango_layout_get_extents(). Avoids one pango_font_get_glyph_extents()
call per glyph per layout rendering. We now make 2 such calls.
- Don't cache run_logical_rect in PangoLayoutIter.
Avoids one pango_font_get_glyph_extents() call per glyph per layout
rendering. We are down to 1 now.
- Cache line extents. This avoids the final pango_font_get_glyph_extents()
call per glyph per layout rendering. Now we don't make any
pango_font_get_glyph_extents() calls when rendering a layout (some
conditions apply)!
- Replace PANGO_IS_RENDERER with PANGO_IS_RENDERER_FAST for most
internal uses, that is, just a NULL-check.
- Use simple, fast, casts instead of PANGO_CAIRO_*() macros where the
object cannot have reached us if it wasn't of the right type.
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