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win32: work around Pango(?) bug in freeing font maps

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This commit is contained in:
Matthew Flatt 2011-05-03 10:19:35 -06:00
parent be524ade36
commit 4a41196dc2
1 changed files with 28 additions and 1 deletions
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29
collects/racket/draw/unsafe/pango.rkt
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@ -120,9 +120,36 @@
(define-glib g_free (_fun _pointer -> _void)
#:wrap (deallocator))
;; For working around a Win32 Pango bug (see `unref-font-map'):
(define _GQueue (_cpointer 'GQueue))
(define-cstruct _PangoWin32FontMap ([type-instance _pointer]
[ref_count _uint]
[qdata _pointer]
[font_cache _pointer]
[freed_fonts _GQueue]))
(define-glib g_queue_foreach (_fun _GQueue (_fun _pointer -> _void) _pointer -> _void))
(define-glib g_queue_free (_fun _GQueue -> _void))
(define-glib g_queue_new (_fun -> _GQueue))
(define (unref-font-map v)
(when (eq? (system-type) 'windows)
;; For version 1.28 of Pango, reported as Bug 649293:
;; Under Windows, PangoWin32FontMap holds a queue of freed
;; fonts, and the fonts hold a weak link back to the map.
;; Unreffing the font map drops the weak links and *then*
;; tries to release the freed fonts, which leads to failures
;; releasing the fonts. Work around the bug by manually
;; flushing the queue of freed fonts before the font map is
;; unreffed.
(let ([fm (cast v _pointer _PangoWin32FontMap-pointer)])
(g_queue_foreach (PangoWin32FontMap-freed_fonts fm) g_object_unref #f)
(g_queue_free (PangoWin32FontMap-freed_fonts fm))
(set-PangoWin32FontMap-freed_fonts! fm (g_queue_new))))
(g_object_unref v))
(define-pangocairo pango_cairo_font_map_get_default (_fun -> PangoFontMap)) ;; not an allocator
(define-pangocairo pango_cairo_font_map_new (_fun -> PangoFontMap)
#:wrap (allocator g_object_unref))
#:wrap (allocator unref-font-map))
(define-pango pango_context_new (_fun -> PangoContext)
#:wrap (allocator g_object_unref))