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Tk_AllocBitmapFromObj(3)     Tk Library Procedures    Tk_AllocBitmapFromObj(3)

______________________________________________________________________________

NAME
       Tk_AllocBitmapFromObj,	     Tk_GetBitmap,	  Tk_GetBitmapFromObj,
       Tk_DefineBitmap,	 Tk_NameOfBitmap,  Tk_SizeOfBitmap,  Tk_FreeBitmapFro‐
       mObj, Tk_FreeBitmap - maintain database of single-plane pixmaps

SYNOPSIS
       #include <tk.h>

       Pixmap
       Tk_AllocBitmapFromObj(interp, tkwin, objPtr)

       Pixmap
       Tk_GetBitmap(interp, tkwin, info)

       Pixmap
       Tk_GetBitmapFromObj(tkwin, objPtr)

       int
       Tk_DefineBitmap(interp, name, source, width, height)

       const char *
       Tk_NameOfBitmap(display, bitmap)

       Tk_SizeOfBitmap(display, bitmap, widthPtr, heightPtr)

       Tk_FreeBitmapFromObj(tkwin, objPtr)

       Tk_FreeBitmap(display, bitmap)

ARGUMENTS
       Tcl_Interp *interp (in)		     Interpreter   to  use  for	 error
					     reporting; if NULL then no	 error
					     message is left after errors.

       Tk_Window tkwin (in)		     Token  for	 window	 in  which the
					     bitmap will be used.

       Tcl_Obj *objPtr (in/out)		     String  value  describes  desired
					     bitmap; internal rep will be mod‐
					     ified to cache pointer to	corre‐
					     sponding Pixmap.

       const char *info (in)		     Same as objPtr except description
					     of bitmap is passed as  a	string
					     and   resulting   Pixmap  is  not
					     cached.

       const char *name (in)		     Name  for	new   bitmap   to   be
					     defined.

       const char *source (in)		     Data for bitmap, in standard bit‐
					     map format.  Must	be  stored  in
					     static  memory  whose  value will
					     never change.

       int width (in)			     Width of bitmap.

       int height (in)			     Height of bitmap.

       int *widthPtr (out)		     Pointer to word to fill  in  with
					     bitmap's width.

       int *heightPtr (out)		     Pointer  to  word to fill in with
					     bitmap's height.

       Display *display (in)		     Display  for  which  bitmap   was
					     allocated.

       Pixmap bitmap (in)		     Identifier for a bitmap allocated
					     by	   Tk_AllocBitmapFromObj    or
					     Tk_GetBitmap.
_________________________________________________________________

DESCRIPTION
       These  procedures  manage  a  collection of bitmaps (one-plane pixmaps)
       being used by an application.  The procedures allow bitmaps to  be  re-
       used efficiently, thereby avoiding server overhead, and also allow bit‐
       maps to be named with character strings.

       Tk_AllocBitmapFromObj returns a Pixmap identifier  for  a  bitmap  that
       matches the description in objPtr and is suitable for use in tkwin.  It
       re-uses an existing bitmap, if possible, and creates a new  one	other‐
       wise.  ObjPtr's value must have one of the following forms:

       @fileName	   FileName  must  be  the name of a file containing a
			   bitmap description in the standard X11 or X10  for‐
			   mat.

       name		   Name	 must  be  the name of a bitmap defined previ‐
			   ously with a call to Tk_DefineBitmap.  The  follow‐
			   ing names are pre-defined by Tk:

			   error       The  international  “don't”  symbol:  a
				       circle with a diagonal line across it.

			   gray75      75% gray: a checkerboard pattern	 where
				       three out of four bits are on.

			   gray50      50%  gray: a checkerboard pattern where
				       every other bit is on.

			   gray25      25% gray: a checkerboard pattern	 where
				       one out of every four bits is on.

			   gray12      12.5%  gray: a pattern where one-eighth
				       of the bits are on, consisting of every
				       fourth pixel in every other row.

			   hourglass   An hourglass symbol.

			   info	       A large letter “i”.

			   questhead   The  silhouette of a human head, with a
				       question mark in it.

			   question    A large question-mark.

			   warning     A large exclamation point.

			   In addition, the following  pre-defined  names  are
			   available only on the Macintosh platform:

			   document    A generic document.

			   stationery  Document stationery.

			   edition     The edition symbol.

			   application Generic application icon.

			   accessory   A desk accessory.

			   folder      Generic folder icon.

			   pfolder     A locked folder.

			   trash       A trash can.

			   floppy      A floppy disk.

			   ramdisk     A floppy disk with chip.

			   cdrom       A cd disk icon.

			   preferences A folder with prefs symbol.

			   querydoc    A database document icon.

			   stop	       A stop sign.

			   note	       A face with balloon words.

			   caution     A triangle with an exclamation point.

       Under  normal  conditions,  Tk_AllocBitmapFromObj returns an identifier
       for the requested bitmap.  If an error occurs in creating  the  bitmap,
       such  as	 when  objPtr  refers  to  a  non-existent  file, then None is
       returned and an error message is left in interp's result if  interp  is
       not  NULL.  Tk_AllocBitmapFromObj  caches  information about the return
       value in objPtr, which speeds up future calls  to  procedures  such  as
       Tk_AllocBitmapFromObj and Tk_GetBitmapFromObj.

       Tk_GetBitmap  is	 identical  to	Tk_AllocBitmapFromObj  except that the
       description of the bitmap is specified with  a  string  instead	of  an
       object.	 This  prevents Tk_GetBitmap from caching the return value, so
       Tk_GetBitmap is less efficient than Tk_AllocBitmapFromObj.

       Tk_GetBitmapFromObj returns the token for an existing bitmap, given the
       window  and description used to create the bitmap.  Tk_GetBitmapFromObj
       does not actually create the bitmap; the bitmap must already have  been
       created	with a previous call to Tk_AllocBitmapFromObj or Tk_GetBitmap.
       The return value is cached in objPtr, which speeds up future  calls  to
       Tk_GetBitmapFromObj with the same objPtr and tkwin.

       Tk_DefineBitmap	associates  a  name with in-memory bitmap data so that
       the name can be used in later calls to Tk_AllocBitmapFromObj or Tk_Get‐
       Bitmap.	 The nameId argument gives a name for the bitmap;  it must not
       previously have been used in a call to Tk_DefineBitmap.	The  arguments
       source,	width,	and  height describe the bitmap.  Tk_DefineBitmap nor‐
       mally returns TCL_OK; if an error occurs (e.g. a	 bitmap	 named	nameId
       has  already been defined) then TCL_ERROR is returned and an error mes‐
       sage is left in interp->result.	 Note:	 Tk_DefineBitmap  expects  the
       memory  pointed	to  by	source to be static:  Tk_DefineBitmap does not
       make a private copy of this memory, but uses the bytes  pointed	to  by
       source later in calls to Tk_AllocBitmapFromObj or Tk_GetBitmap.

       Typically  Tk_DefineBitmap  is  used  by	 #include-ing  a  bitmap  file
       directly into a C program and then referencing the variables defined by
       the  file.  For example, suppose there exists a file stip.bitmap, which
       was created by the bitmap program and contains a stipple pattern.   The
       following code uses Tk_DefineBitmap to define a new bitmap named foo:
	      Pixmap bitmap;
	      #include "stip.bitmap"
	      Tk_DefineBitmap(interp, "foo", stip_bits,
		  stip_width, stip_height);
	      ...
	      bitmap = Tk_GetBitmap(interp, tkwin, "foo");
       This  code causes the bitmap file to be read at compile-time and incor‐
       porates the bitmap information into  the	 program's  executable	image.
       The same bitmap file could be read at run-time using Tk_GetBitmap:
	      Pixmap bitmap;
	      bitmap = Tk_GetBitmap(interp, tkwin, "@stip.bitmap");
       The  second  form  is  a	 bit more flexible (the file could be modified
       after the program has been compiled, or a  different  string  could  be
       provided	 to  read  a  different	 file),	 but it is a little slower and
       requires the bitmap file to exist separately from the program.

       Tk maintains a database of all the bitmaps that are currently  in  use.
       Whenever possible, it will return an existing bitmap rather than creat‐
       ing a new one.  When a bitmap is no longer used,	 Tk  will  release  it
       automatically.  This approach can substantially reduce server overhead,
       so Tk_AllocBitmapFromObj and Tk_GetBitmap should generally be  used  in
       preference to Xlib procedures like XReadBitmapFile.

       The  bitmaps  returned  by  Tk_AllocBitmapFromObj  and Tk_GetBitmap are
       shared, so callers should never modify them.  If a bitmap must be modi‐
       fied  dynamically, then it should be created by calling Xlib procedures
       such as XReadBitmapFile or XCreatePixmap directly.

       The procedure Tk_NameOfBitmap is roughly the inverse  of	 Tk_GetBitmap.
       Given an X Pixmap argument, it returns the textual description that was
       passed to Tk_GetBitmap when the bitmap was created.  Bitmap  must  have
       been  the return value from a previous call to Tk_AllocBitmapFromObj or
       Tk_GetBitmap.

       Tk_SizeOfBitmap returns the dimensions of its bitmap  argument  in  the
       words  pointed  to  by  the  widthPtr and heightPtr arguments.  As with
       Tk_NameOfBitmap, bitmap must have been created by Tk_AllocBitmapFromObj
       or Tk_GetBitmap.

       When   a	  bitmap   is	no   longer  needed,  Tk_FreeBitmapFromObj  or
       Tk_FreeBitmap should be called to release it.  For Tk_FreeBitmapFromObj
       the  bitmap  to	release is specified with the same information used to
       create it; for Tk_FreeBitmap the bitmap to release  is  specified  with
       its   Pixmap   token.	There	should	 be   exactly	one   call  to
       Tk_FreeBitmapFromObj   or    Tk_FreeBitmap    for    each    call    to
       Tk_AllocBitmapFromObj or Tk_GetBitmap.

BUGS
       In  determining whether an existing bitmap can be used to satisfy a new
       request, Tk_AllocBitmapFromObj and Tk_GetBitmap consider only the imme‐
       diate  value  of the string description.	 For example, when a file name
       is passed to Tk_GetBitmap, Tk_GetBitmap will assume it is safe  to  re-
       use  an	existing  bitmap created from the same file name:  it will not
       check to see whether the file itself has changed, or whether  the  cur‐
       rent directory has changed, thereby causing the name to refer to a dif‐
       ferent file.

KEYWORDS
       bitmap, pixmap

Tk				      8.1	      Tk_AllocBitmapFromObj(3)
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