On 03/16/2010 02:05 AM, Werner LEMBERG wrote: >> Use case is very simple: with the FreeType stack, all of hb_face_t, >> PangoFont, and cairo_scaled_font_t all can use keeping a pointer to >> an FT_Face. But alas, one cannot do that safely since you never >> know when the face is going away. > > Again: What would you like as an interface? Something like a function > `FT_Face_IsAlive', returning a boolean?
Nope. FT_Reference_Face(). That increments the refcount. Then FT_Done_Face() should decrement the refcount and only destroy if it drops to zero. Refcount is initialized to 1 when face is constructed. And of course these should be done using atomic operators. Same about FT_Library and any other object worth keeping around. But those two are the major ones. >> If there was refcounts in FreeType, harfbuzz could increment the >> refcount on the FT_Face it keeps a pointer to. > > Since my knowledge is quite poor here, can you point me to a library > which implements something along this? Any of HarfBuzz, cairo, glib, fontconfig. But I think the description above should be enough to implement it. Of course that doesn't make FreeType threadsafe, but it does immensely simplify life-cycle management. behdad > > Werner > _______________________________________________ Freetype-devel mailing list Freetype-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/freetype-devel
