FreeBSD Manual Pages
Tk_AllocFontFromObj(3) Tk Library Procedures Tk_AllocFontFromObj(3) ______________________________________________________________________________ NAME Tk_AllocFontFromObj, Tk_GetFont, Tk_GetFontFromObj, Tk_NameOfFont, Tk_FreeFontFromObj, Tk_FreeFont - maintain database of fonts SYNOPSIS #include <tk.h> Tk_Font Tk_AllocFontFromObj(interp, tkwin, objPtr) Tk_Font Tk_GetFont(interp, tkwin, string) Tk_Font Tk_GetFontFromObj(tkwin, objPtr) const char * Tk_NameOfFont(tkfont) Tk_Font Tk_FreeFontFromObj(tkwin, objPtr) void Tk_FreeFont(tkfont) ARGUMENTS Tcl_Interp *interp (in) Interpreter to use for error report- ing. If NULL, then no error messages are left after errors. Tk_Window tkwin (in) Token for window in which font will be used. Tcl_Obj *objPtr (in/out) Gives name or description of font. See documentation for the font command for details on acceptable formats. Internal rep will be modified to cache corresponding Tk_Font. const char *string (in) Same as objPtr except description of font is passed as a string and result- ing Tk_Font is not cached. Tk_Font tkfont (in) Opaque font token. ______________________________________________________________________________ DESCRIPTION Tk_AllocFontFromObj finds the font indicated by objPtr and returns a token that represents the font. The return value can be used in subse- quent calls to procedures such as Tk_GetFontMetrics, Tk_MeasureChars, and Tk_FreeFont. The Tk_Font token will remain valid until Tk_Free- FontFromObj or Tk_FreeFont is called to release it. ObjPtr can contain either a symbolic name or a font description; see the documentation for the font command for a description of the valid formats. If Tk_Alloc- FontFromObj is unsuccessful (because, for example, objPtr did not con- tain a valid font specification) then it returns NULL and leaves an er- ror message in interp's result if interp is not NULL. Tk_AllocFontFro- mObj caches information about the return value in objPtr, which speeds up future calls to procedures such as Tk_AllocFontFromObj and Tk_Get- FontFromObj. Tk_GetFont is identical to Tk_AllocFontFromObj except that the descrip- tion of the font is specified with a string instead of an object. This prevents Tk_GetFont from caching the matching Tk_Font, so Tk_GetFont is less efficient than Tk_AllocFontFromObj. Tk_GetFontFromObj returns the token for an existing font, given the window and description used to create the font. Tk_GetFontFromObj does not actually create the font; the font must already have been created with a previous call to Tk_AllocFontFromObj or Tk_GetFont. The return value is cached in objPtr, which speeds up future calls to Tk_GetFont- FromObj with the same objPtr and tkwin. Tk_AllocFontFromObj and Tk_GetFont maintain a database of all fonts they have allocated. If the same font is requested multiple times (e.g. by different windows or for different purposes), then a single Tk_Font will be shared for all uses. The underlying resources will be freed automatically when no-one is using the font anymore. The procedure Tk_NameOfFont is roughly the inverse of Tk_GetFont. Given a tkfont that was created by Tk_GetFont (or Tk_AllocFontFromObj), the return value is the string argument that was passed to Tk_GetFont to create the font. The string returned by Tk_NameOfFont is only guar- anteed to persist until the tkfont is deleted. The caller must not modify this string. When a font is no longer needed, Tk_FreeFontFromObj or Tk_FreeFont should be called to release it. For Tk_FreeFontFromObj the font to re- lease is specified with the same information used to create it; for Tk_FreeFont the font to release is specified with its Tk_Font token. There should be exactly one call to Tk_FreeFontFromObj or Tk_FreeFont for each call to Tk_AllocFontFromObj or Tk_GetFont. SEE ALSO Tk_FontId(3) KEYWORDS font Tk 8.1 Tk_AllocFontFromObj(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | SEE ALSO | KEYWORDS
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=Tk_GetFont.tk86&sektion=3&manpath=FreeBSD+Ports+14.3.quarterly>