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| 246 | .TH Tk_AllocFontFromObj 3 8.1 Tk "Tk Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tk_AllocFontFromObj, Tk_GetFont, Tk_GetFontFromObj, Tk_NameOfFont, Tk_FreeFontFromObj, Tk_FreeFont \- maintain database of fonts |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tk.h>\fR |
| 253 | .sp |
| 254 | .VS 8.1 |
| 255 | Tk_Font |
| 256 | \fBTk_AllocFontFromObj(\fIinterp, tkwin, objPtr\fB)\fR |
| 257 | .sp |
| 258 | Tk_Font |
| 259 | \fBTk_GetFont(\fIinterp, tkwin, string\fB)\fR |
| 260 | .sp |
| 261 | Tk_Font |
| 262 | \fBTk_GetFontFromObj(\fItkwin, objPtr\fB)\fR |
| 263 | .VE |
| 264 | .sp |
| 265 | CONST char * |
| 266 | \fBTk_NameOfFont(\fItkfont\fB)\fR |
| 267 | .sp |
| 268 | .VS 8.1 |
| 269 | Tk_Font |
| 270 | \fBTk_FreeFontFromObj(\fItkwin, objPtr\fB)\fR |
| 271 | .VE |
| 272 | .sp |
| 273 | void |
| 274 | \fBTk_FreeFont(\fItkfont\fB)\fR |
| 275 | |
| 276 | .SH ARGUMENTS |
| 277 | .AS "const char" *tkfont |
| 278 | .AP "Tcl_Interp" *interp in |
| 279 | Interpreter to use for error reporting. If NULL, then no error |
| 280 | messages are left after errors. |
| 281 | .AP Tk_Window tkwin in |
| 282 | Token for window in which font will be used. |
| 283 | .VS 8.1 br |
| 284 | .AP Tcl_Obj *objPtr in/out |
| 285 | Gives name or description of font. See documentation |
| 286 | for the \fBfont\fR command for details on acceptable formats. |
| 287 | Internal rep will be modified to cache corresponding Tk_Font. |
| 288 | .AP "const char" *string in |
| 289 | Same as \fIobjPtr\fR except description of font is passed as a string and |
| 290 | resulting Tk_Font isn't cached. |
| 291 | .VE |
| 292 | .AP Tk_Font tkfont in |
| 293 | Opaque font token. |
| 294 | .BE |
| 295 | .SH DESCRIPTION |
| 296 | .PP |
| 297 | .VS 8.1 |
| 298 | \fBTk_AllocFontFromObj\fR finds the font indicated by \fIobjPtr\fR and |
| 299 | returns a token that represents the font. The return value can be used |
| 300 | in subsequent calls to procedures such as \fBTk_GetFontMetrics\fR, |
| 301 | \fBTk_MeasureChars\fR, and \fBTk_FreeFont\fR. The Tk_Font token |
| 302 | will remain valid until |
| 303 | \fBTk_FreeFontFromObj\fR or \fBTk_FreeFont\fR is called to release it. |
| 304 | \fIObjPtr\fR can contain either a symbolic name or a font description; see |
| 305 | the documentation for the \fBfont\fR command for a description of the |
| 306 | valid formats. If \fBTk_AllocFontFromObj\fR is unsuccessful (because, |
| 307 | for example, \fIobjPtr\fR did not contain a valid font specification) then it |
| 308 | returns \fBNULL\fR and leaves an error message in \fIinterp\fR's result |
| 309 | if \fIinterp\fR isn't NULL. \fBTk_AllocFontFromObj\fR caches |
| 310 | information about the return |
| 311 | value in \fIobjPtr\fR, which speeds up future calls to procedures |
| 312 | such as \fBTk_AllocFontFromObj\fR and \fBTk_GetFontFromObj\fR. |
| 313 | .PP |
| 314 | \fBTk_GetFont\fR is identical to \fBTk_AllocFontFromObj\fR except |
| 315 | that the description of the font is specified with a string instead |
| 316 | of an object. This prevents \fBTk_GetFont\fR from caching the |
| 317 | matching Tk_Font, so \fBTk_GetFont\fR is less efficient than |
| 318 | \fBTk_AllocFontFromObj\fR. |
| 319 | .PP |
| 320 | \fBTk_GetFontFromObj\fR returns the token for an existing font, given |
| 321 | the window and description used to create the font. |
| 322 | \fBTk_GetFontFromObj\fR doesn't actually create the font; the font |
| 323 | must already have been created with a previous call to |
| 324 | \fBTk_AllocFontFromObj\fR or \fBTk_GetFont\fR. The return |
| 325 | value is cached in \fIobjPtr\fR, which speeds up |
| 326 | future calls to \fBTk_GetFontFromObj\fR with the same \fIobjPtr\fR |
| 327 | and \fItkwin\fR. |
| 328 | .VE |
| 329 | .PP |
| 330 | \fBTk_AllocFontFromObj\fR and \fBTk_GetFont\fR maintain |
| 331 | a database of all fonts they have allocated. If |
| 332 | the same font is requested multiple times (e.g. by different |
| 333 | windows or for different purposes), then a single Tk_Font will be |
| 334 | shared for all uses. The underlying resources will be freed automatically |
| 335 | when no-one is using the font anymore. |
| 336 | .PP |
| 337 | The procedure \fBTk_NameOfFont\fR is roughly the inverse of |
| 338 | \fBTk_GetFont\fR. Given a \fItkfont\fR that was created by |
| 339 | \fBTk_GetFont\fR (or \fBTk_AllocFontFromObj\fR), the return value is |
| 340 | the \fIstring\fR argument that was |
| 341 | passed to \fBTk_GetFont\fR to create the font. The string returned by |
| 342 | \fBTk_NameOfFont\fR is only guaranteed to persist until the \fItkfont\fR |
| 343 | is deleted. The caller must not modify this string. |
| 344 | .PP |
| 345 | .VS 8.1 |
| 346 | When a font is no longer needed, |
| 347 | \fBTk_FreeFontFromObj\fR or \fBTk_FreeFont\fR should be called to |
| 348 | release it. For \fBTk_FreeFontFromObj\fR the font to release is specified |
| 349 | with the same information used to create it; for |
| 350 | \fBTk_FreeFont\fR the font to release is specified |
| 351 | with its Tk_Font token. There should be |
| 352 | exactly one call to \fBTk_FreeFontFromObj\fR or \fBTk_FreeFont\fR |
| 353 | for each call to \fBTk_AllocFontFromObj\fR or \fBTk_GetFont\fR. |
| 354 | .VE |
| 355 | |
| 356 | .SH "SEE ALSO" |
| 357 | Tk_FontId(3) |
| 358 | |
| 359 | .SH KEYWORDS |
| 360 | font |