/*
* tkCursor.c --
*
* This file maintains a database of read-only cursors for the Tk
* toolkit. This allows cursors to be shared between widgets and also
* avoids round-trips to the X server.
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkCursor.c,v 1.18 2007/12/13 15:24:14 dgp Exp $
*/
#include "tkInt.h"
/*
* A TkCursor structure exists for each cursor that is currently active. Each
* structure is indexed with two hash tables defined below. One of the tables
* is cursorIdTable, and the other is either cursorNameTable or
* cursorDataTable, each of which are stored in the TkDisplay structure for
* the current thread.
*/
typedef struct {
CONST char *source; /* Cursor bits. */
CONST char *mask; /* Mask bits. */
int width, height; /* Dimensions of cursor (and data and
* mask). */
int xHot, yHot; /* Location of cursor hot-spot. */
Tk_Uid fg, bg; /* Colors for cursor. */
Display *display; /* Display on which cursor will be used. */
} DataKey;
/*
* Forward declarations for functions defined in this file:
*/
static void CursorInit(TkDisplay *dispPtr);
static void DupCursorObjProc(Tcl_Obj *srcObjPtr,
Tcl_Obj *dupObjPtr);
static void FreeCursor(TkCursor *cursorPtr);
static void FreeCursorObjProc(Tcl_Obj *objPtr);
static TkCursor * TkcGetCursor(Tcl_Interp *interp,
Tk_Window tkwin, CONST char *name);
static TkCursor * GetCursorFromObj(Tk_Window tkwin, Tcl_Obj *objPtr);
static void InitCursorObj(Tcl_Obj *objPtr);
/*
* The following structure defines the implementation of the "cursor" Tcl
* object, used for drawing. The color object remembers the hash table
* entry associated with a color. The actual allocation and deallocation
* of the color should be done by the configuration package when the cursor
* option is set.
*/
Tcl_ObjType tkCursorObjType = {
"cursor", /* name */
FreeCursorObjProc, /* freeIntRepProc */
DupCursorObjProc, /* dupIntRepProc */
NULL, /* updateStringProc */
NULL /* setFromAnyProc */
};
/*
*----------------------------------------------------------------------
*
* Tk_AllocCursorFromObj --
*
* Given a Tcl_Obj *, map the value to a corresponding Tk_Cursor
* structure based on the tkwin given.
*
* Results:
* The return value is the X identifer for the desired cursor, unless
* objPtr couldn't be parsed correctly. In this case, None is returned
* and an error message is left in the interp's result. The caller should
* never modify the cursor that is returned, and should eventually call
* Tk_FreeCursorFromObj when the cursor is no longer needed.
*
* Side effects:
* The cursor is added to an internal database with a reference count.
* For each call to this function, there should eventually be a call to
* Tk_FreeCursorFromObj, so that the database can be cleaned up when
* cursors aren't needed anymore.
*
*----------------------------------------------------------------------
*/
Tk_Cursor
Tk_AllocCursorFromObj(
Tcl_Interp *interp, /* Interp for error results. */
Tk_Window tkwin, /* Window in which the cursor will be used.*/
Tcl_Obj *objPtr) /* Object describing cursor; see manual entry
* for description of legal syntax of this
* obj's string rep. */
{
TkCursor *cursorPtr;
if (objPtr->typePtr != &tkCursorObjType) {
InitCursorObj(objPtr);
}
cursorPtr = (TkCursor *) objPtr->internalRep.twoPtrValue.ptr1;
/*
* If the object currently points to a TkCursor, see if it's the one we
* want. If so, increment its reference count and return.
*/
if (cursorPtr != NULL) {
if (cursorPtr->resourceRefCount == 0) {
/*
* This is a stale reference: it refers to a TkCursor that's no
* longer in use. Clear the reference.
*/
FreeCursorObjProc(objPtr);
cursorPtr = NULL;
} else if (Tk_Display(tkwin) == cursorPtr->display) {
cursorPtr->resourceRefCount++;
return cursorPtr->cursor;
}
}
/*
* The object didn't point to the TkCursor that we wanted. Search the list
* of TkCursors with the same name to see if one of the other TkCursors is
* the right one.
*/
if (cursorPtr != NULL) {
TkCursor *firstCursorPtr = (TkCursor *)
Tcl_GetHashValue(cursorPtr->hashPtr);
FreeCursorObjProc(objPtr);
for (cursorPtr = firstCursorPtr; cursorPtr != NULL;
cursorPtr = cursorPtr->nextPtr) {
if (Tk_Display(tkwin) == cursorPtr->display) {
cursorPtr->resourceRefCount++;
cursorPtr->objRefCount++;
objPtr->internalRep.twoPtrValue.ptr1 = (void *) cursorPtr;
return cursorPtr->cursor;
}
}
}
/*
* Still no luck. Call TkcGetCursor to allocate a new TkCursor object.
*/
cursorPtr = TkcGetCursor(interp, tkwin, Tcl_GetString(objPtr));
objPtr->internalRep.twoPtrValue.ptr1 = (void *) cursorPtr;
if (cursorPtr == NULL) {
return None;
}
cursorPtr->objRefCount++;
return cursorPtr->cursor;
}
/*
*----------------------------------------------------------------------
*
* Tk_GetCursor --
*
* Given a string describing a cursor, locate (or create if necessary) a
* cursor that fits the description.
*
* Results:
* The return value is the X identifer for the desired cursor, unless
* string couldn't be parsed correctly. In this case, None is returned
* and an error message is left in the interp's result. The caller should
* never modify the cursor that is returned, and should eventually call
* Tk_FreeCursor when the cursor is no longer needed.
*
* Side effects:
* The cursor is added to an internal database with a reference count.
* For each call to this function, there should eventually be a call to
* Tk_FreeCursor, so that the database can be cleaned up when cursors
* aren't needed anymore.
*
*----------------------------------------------------------------------
*/
Tk_Cursor
Tk_GetCursor(
Tcl_Interp *interp, /* Interpreter to use for error reporting. */
Tk_Window tkwin, /* Window in which cursor will be used. */
Tk_Uid string) /* Description of cursor. See manual entry for
* details on legal syntax. */
{
TkCursor *cursorPtr = TkcGetCursor(interp, tkwin, string);
if (cursorPtr == NULL) {
return None;
}
return cursorPtr->cursor;
}
/*
*----------------------------------------------------------------------
*
* TkcGetCursor --
*
* Given a string describing a cursor, locate (or create if necessary) a
* cursor that fits the description. This routine returns the internal
* data structure for the cursor, which avoids extra hash table lookups
* in Tk_AllocCursorFromObj.
*
* Results:
* The return value is a pointer to the TkCursor for the desired cursor,
* unless string couldn't be parsed correctly. In this case, NULL is
* returned and an error message is left in the interp's result. The
* caller should never modify the cursor that is returned, and should
* eventually call Tk_FreeCursor when the cursor is no longer needed.
*
* Side effects:
* The cursor is added to an internal database with a reference count.
* For each call to this function, there should eventually be a call to
* Tk_FreeCursor, so that the database can be cleaned up when cursors
* aren't needed anymore.
*
*----------------------------------------------------------------------
*/
static TkCursor *
TkcGetCursor(
Tcl_Interp *interp, /* Interpreter to use for error reporting. */
Tk_Window tkwin, /* Window in which cursor will be used. */
CONST char *string) /* Description of cursor. See manual entry for
* details on legal syntax. */
{
Tcl_HashEntry *nameHashPtr;
register TkCursor *cursorPtr;
TkCursor *existingCursorPtr = NULL;
int isNew;
TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (!dispPtr->cursorInit) {
CursorInit(dispPtr);
}
nameHashPtr = Tcl_CreateHashEntry(&dispPtr->cursorNameTable,
string, &isNew);
if (!isNew) {
existingCursorPtr = (TkCursor *) Tcl_GetHashValue(nameHashPtr);
for (cursorPtr = existingCursorPtr; cursorPtr != NULL;
cursorPtr = cursorPtr->nextPtr) {
if (Tk_Display(tkwin) == cursorPtr->display) {
cursorPtr->resourceRefCount++;
return cursorPtr;
}
}
} else {
existingCursorPtr = NULL;
}
cursorPtr = TkGetCursorByName(interp, tkwin, string);
if (cursorPtr == NULL) {
if (isNew) {
Tcl_DeleteHashEntry(nameHashPtr);
}
return NULL;
}
/*
* Add information about this cursor to our database.
*/
cursorPtr->display = Tk_Display(tkwin);
cursorPtr->resourceRefCount = 1;
cursorPtr->objRefCount = 0;
cursorPtr->otherTable = &dispPtr->cursorNameTable;
cursorPtr->hashPtr = nameHashPtr;
cursorPtr->nextPtr = existingCursorPtr;
cursorPtr->idHashPtr = Tcl_CreateHashEntry(&dispPtr->cursorIdTable,
(char *) cursorPtr->cursor, &isNew);
if (!isNew) {
Tcl_Panic("cursor already registered in Tk_GetCursor");
}
Tcl_SetHashValue(nameHashPtr, cursorPtr);
Tcl_SetHashValue(cursorPtr->idHashPtr, cursorPtr);
return cursorPtr;
}
/*
*----------------------------------------------------------------------
*
* Tk_GetCursorFromData --
*
* Given a description of the bits and colors for a cursor, make a cursor
* that has the given properties.
*
* Results:
* The return value is the X identifer for the desired cursor, unless it
* couldn't be created properly. In this case, None is returned and an
* error message is left in the interp's result. The caller should never
* modify the cursor that is returned, and should eventually call
* Tk_FreeCursor when the cursor is no longer needed.
*
* Side effects:
* The cursor is added to an internal database with a reference count.
* For each call to this function, there should eventually be a call to
* Tk_FreeCursor, so that the database can be cleaned up when cursors
* aren't needed anymore.
*
*----------------------------------------------------------------------
*/
Tk_Cursor
Tk_GetCursorFromData(
Tcl_Interp *interp, /* Interpreter to use for error reporting. */
Tk_Window tkwin, /* Window in which cursor will be used. */
CONST char *source, /* Bitmap data for cursor shape. */
CONST char *mask, /* Bitmap data for cursor mask. */
int width, int height, /* Dimensions of cursor. */
int xHot, int yHot, /* Location of hot-spot in cursor. */
Tk_Uid fg, /* Foreground color for cursor. */
Tk_Uid bg) /* Background color for cursor. */
{
DataKey dataKey;
Tcl_HashEntry *dataHashPtr;
register TkCursor *cursorPtr;
int isNew;
XColor fgColor, bgColor;
TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (!dispPtr->cursorInit) {
CursorInit(dispPtr);
}
dataKey.source = source;
dataKey.mask = mask;
dataKey.width = width;
dataKey.height = height;
dataKey.xHot = xHot;
dataKey.yHot = yHot;
dataKey.fg = fg;
dataKey.bg = bg;
dataKey.display = Tk_Display(tkwin);
dataHashPtr = Tcl_CreateHashEntry(&dispPtr->cursorDataTable,
(char *) &dataKey, &isNew);
if (!isNew) {
cursorPtr = (TkCursor *) Tcl_GetHashValue(dataHashPtr);
cursorPtr->resourceRefCount++;
return cursorPtr->cursor;
}
/*
* No suitable cursor exists yet. Make one using the data available and
* add it to the database.
*/
if (XParseColor(dataKey.display, Tk_Colormap(tkwin), fg, &fgColor) == 0) {
Tcl_AppendResult(interp, "invalid color name \"", fg, "\"", NULL);
goto error;
}
if (XParseColor(dataKey.display, Tk_Colormap(tkwin), bg, &bgColor) == 0) {
Tcl_AppendResult(interp, "invalid color name \"", bg, "\"", NULL);
goto error;
}
cursorPtr = TkCreateCursorFromData(tkwin, source, mask, width, height,
xHot, yHot, fgColor, bgColor);
if (cursorPtr == NULL) {
goto error;
}
cursorPtr->resourceRefCount = 1;
cursorPtr->otherTable = &dispPtr->cursorDataTable;
cursorPtr->hashPtr = dataHashPtr;
cursorPtr->objRefCount = 0;
cursorPtr->idHashPtr = Tcl_CreateHashEntry(&dispPtr->cursorIdTable,
(char *) cursorPtr->cursor, &isNew);
cursorPtr->nextPtr = NULL;
if (!isNew) {
Tcl_Panic("cursor already registered in Tk_GetCursorFromData");
}
Tcl_SetHashValue(dataHashPtr, cursorPtr);
Tcl_SetHashValue(cursorPtr->idHashPtr, cursorPtr);
return cursorPtr->cursor;
error:
Tcl_DeleteHashEntry(dataHashPtr);
return None;
}
/*
*--------------------------------------------------------------
*
* Tk_NameOfCursor --
*
* Given a cursor, return a textual string identifying it.
*
* Results:
* If cursor was created by Tk_GetCursor, then the return value is the
* "string" that was used to create it. Otherwise the return value is a
* string giving the X identifier for the cursor. The storage for the
* returned string is only guaranteed to persist up until the next call
* to this function.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
CONST char *
Tk_NameOfCursor(
Display *display, /* Display for which cursor was allocated. */
Tk_Cursor cursor) /* Identifier for cursor whose name is
* wanted. */
{
Tcl_HashEntry *idHashPtr;
TkCursor *cursorPtr;
TkDisplay *dispPtr;
dispPtr = TkGetDisplay(display);
if (!dispPtr->cursorInit) {
printid:
sprintf(dispPtr->cursorString, "cursor id %p", cursor);
return dispPtr->cursorString;
}
idHashPtr = Tcl_FindHashEntry(&dispPtr->cursorIdTable, (char *) cursor);
if (idHashPtr == NULL) {
goto printid;
}
cursorPtr = (TkCursor *) Tcl_GetHashValue(idHashPtr);
if (cursorPtr->otherTable != &dispPtr->cursorNameTable) {
goto printid;
}
return cursorPtr->hashPtr->key.string;
}
/*
*----------------------------------------------------------------------
*
* FreeCursor --
*
* This function is invoked by both Tk_FreeCursorFromObj and
* Tk_FreeCursor; it does all the real work of deallocating a cursor.
*
* Results:
* None.
*
* Side effects:
* The reference count associated with cursor is decremented, and it is
* officially deallocated if no-one is using it anymore.
*
*----------------------------------------------------------------------
*/
static void
FreeCursor(
TkCursor *cursorPtr) /* Cursor to be released. */
{
TkCursor *prevPtr;
cursorPtr->resourceRefCount--;
if (cursorPtr->resourceRefCount > 0) {
return;
}
Tcl_DeleteHashEntry(cursorPtr->idHashPtr);
prevPtr = (TkCursor *) Tcl_GetHashValue(cursorPtr->hashPtr);
if (prevPtr == cursorPtr) {
if (cursorPtr->nextPtr == NULL) {
Tcl_DeleteHashEntry(cursorPtr->hashPtr);
} else {
Tcl_SetHashValue(cursorPtr->hashPtr, cursorPtr->nextPtr);
}
} else {
while (prevPtr->nextPtr != cursorPtr) {
prevPtr = prevPtr->nextPtr;
}
prevPtr->nextPtr = cursorPtr->nextPtr;
}
TkpFreeCursor(cursorPtr);
if (cursorPtr->objRefCount == 0) {
ckfree((char *) cursorPtr);
}
}
/*
*----------------------------------------------------------------------
*
* Tk_FreeCursor --
*
* This function is called to release a cursor allocated by Tk_GetCursor
* or TkGetCursorFromData.
*
* Results:
* None.
*
* Side effects:
* The reference count associated with cursor is decremented, and it is
* officially deallocated if no-one is using it anymore.
*
*----------------------------------------------------------------------
*/
void
Tk_FreeCursor(
Display *display, /* Display for which cursor was allocated. */
Tk_Cursor cursor) /* Identifier for cursor to be released. */
{
Tcl_HashEntry *idHashPtr;
TkDisplay *dispPtr = TkGetDisplay(display);
if (!dispPtr->cursorInit) {
Tcl_Panic("Tk_FreeCursor called before Tk_GetCursor");
}
idHashPtr = Tcl_FindHashEntry(&dispPtr->cursorIdTable, (char *) cursor);
if (idHashPtr == NULL) {
Tcl_Panic("Tk_FreeCursor received unknown cursor argument");
}
FreeCursor((TkCursor *) Tcl_GetHashValue(idHashPtr));
}
/*
*----------------------------------------------------------------------
*
* Tk_FreeCursorFromObj --
*
* This function is called to release a cursor allocated by
* Tk_AllocCursorFromObj. It does not throw away the Tcl_Obj *; it only
* gets rid of the hash table entry for this cursor and clears the cached
* value that is normally stored in the object.
*
* Results:
* None.
*
* Side effects:
* The reference count associated with the cursor represented by objPtr
* is decremented, and the cursor is released to X if there are no
* remaining uses for it.
*
*----------------------------------------------------------------------
*/
void
Tk_FreeCursorFromObj(
Tk_Window tkwin, /* The window this cursor lives in. Needed for
* the display value. */
Tcl_Obj *objPtr) /* The Tcl_Obj * to be freed. */
{
FreeCursor(GetCursorFromObj(tkwin, objPtr));
FreeCursorObjProc(objPtr);
}
/*
*---------------------------------------------------------------------------
*
* FreeCursorFromObjProc --
*
* This proc is called to release an object reference to a cursor.
* Called when the object's internal rep is released or when the cached
* tkColPtr needs to be changed.
*
* Results:
* None.
*
* Side effects:
* The object reference count is decremented. When both it and the hash
* ref count go to zero, the color's resources are released.
*
*---------------------------------------------------------------------------
*/
static void
FreeCursorObjProc(
Tcl_Obj *objPtr) /* The object we are releasing. */
{
TkCursor *cursorPtr = (TkCursor *) objPtr->internalRep.twoPtrValue.ptr1;
if (cursorPtr != NULL) {
cursorPtr->objRefCount--;
if ((cursorPtr->objRefCount == 0)
&& (cursorPtr->resourceRefCount == 0)) {
ckfree((char *) cursorPtr);
}
objPtr->internalRep.twoPtrValue.ptr1 = NULL;
}
}
/*
*---------------------------------------------------------------------------
*
* DupCursorObjProc --
*
* When a cached cursor object is duplicated, this is called to update
* the internal reps.
*
* Results:
* None.
*
* Side effects:
* The color's objRefCount is incremented and the internal rep of the
* copy is set to point to it.
*
*---------------------------------------------------------------------------
*/
static void
DupCursorObjProc(
Tcl_Obj *srcObjPtr, /* The object we are copying from. */
Tcl_Obj *dupObjPtr) /* The object we are copying to. */
{
TkCursor *cursorPtr = (TkCursor *) srcObjPtr->internalRep.twoPtrValue.ptr1;
dupObjPtr->typePtr = srcObjPtr->typePtr;
dupObjPtr->internalRep.twoPtrValue.ptr1 = (void *) cursorPtr;
if (cursorPtr != NULL) {
cursorPtr->objRefCount++;
}
}
/*
*----------------------------------------------------------------------
*
* Tk_GetCursorFromObj --
*
* Returns the cursor referred to buy a Tcl object. The cursor must
* already have been allocated via a call to Tk_AllocCursorFromObj or
* Tk_GetCursor.
*
* Results:
* Returns the Tk_Cursor that matches the tkwin and the string rep of the
* name of the cursor given in objPtr.
*
* Side effects:
* If the object is not already a cursor, the conversion will free any
* old internal representation.
*
*----------------------------------------------------------------------
*/
Tk_Cursor
Tk_GetCursorFromObj(
Tk_Window tkwin,
Tcl_Obj *objPtr) /* The object from which to get pixels. */
{
TkCursor *cursorPtr = GetCursorFromObj(tkwin, objPtr);
/*
* GetCursorFromObj should never return NULL
*/
return cursorPtr->cursor;
}
/*
*----------------------------------------------------------------------
*
* GetCursorFromObj --
*
* Returns the cursor referred to by a Tcl object. The cursor must
* already have been allocated via a call to Tk_AllocCursorFromObj or
* Tk_GetCursor.
*
* Results:
* Returns the TkCursor * that matches the tkwin and the string rep of
* the name of the cursor given in objPtr.
*
* Side effects:
* If the object is not already a cursor, the conversion will free any
* old internal representation.
*
*----------------------------------------------------------------------
*/
static TkCursor *
GetCursorFromObj(
Tk_Window tkwin, /* Window in which the cursor will be used. */
Tcl_Obj *objPtr) /* The object that describes the desired
* cursor. */
{
TkCursor *cursorPtr;
Tcl_HashEntry *hashPtr;
TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (objPtr->typePtr != &tkCursorObjType) {
InitCursorObj(objPtr);
}
/*
* The internal representation is a cache of the last cursor used with the
* given name. But there can be lots different cursors for each cursor
* name; one cursor for each display. Check to see if the cursor we have
* cached is the one that is needed.
*/
cursorPtr = (TkCursor *) objPtr->internalRep.twoPtrValue.ptr1;
if ((cursorPtr != NULL) && (Tk_Display(tkwin) == cursorPtr->display)) {
return cursorPtr;
}
/*
* If we get to here, it means the cursor we need is not in the cache.
* Try to look up the cursor in the TkDisplay structure of the window.
*/
hashPtr = Tcl_FindHashEntry(&dispPtr->cursorNameTable,
Tcl_GetString(objPtr));
if (hashPtr == NULL) {
goto error;
}
for (cursorPtr = (TkCursor *) Tcl_GetHashValue(hashPtr);
cursorPtr != NULL; cursorPtr = cursorPtr->nextPtr) {
if (Tk_Display(tkwin) == cursorPtr->display) {
FreeCursorObjProc(objPtr);
objPtr->internalRep.twoPtrValue.ptr1 = (void *) cursorPtr;
cursorPtr->objRefCount++;
return cursorPtr;
}
}
error:
Tcl_Panic("GetCursorFromObj called with non-existent cursor!");
/*
* The following code isn't reached; it's just there to please compilers.
*/
return NULL;
}
/*
*----------------------------------------------------------------------
*
* InitCursorObj --
*
* Bookeeping function to change an objPtr to a cursor type.
*
* Results:
* None.
*
* Side effects:
* The old internal rep of the object is freed. The internal rep is
* cleared. The final form of the object is set by either
* Tk_AllocCursorFromObj or GetCursorFromObj.
*
*----------------------------------------------------------------------
*/
static void
InitCursorObj(
Tcl_Obj *objPtr) /* The object to convert. */
{
const Tcl_ObjType *typePtr;
/*
* Free the old internalRep before setting the new one.
*/
Tcl_GetString(objPtr);
typePtr = objPtr->typePtr;
if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
(*typePtr->freeIntRepProc)(objPtr);
}
objPtr->typePtr = &tkCursorObjType;
objPtr->internalRep.twoPtrValue.ptr1 = NULL;
}
/*
*----------------------------------------------------------------------
*
* CursorInit --
*
* Initialize the structures used for cursor management.
*
* Results:
* None.
*
* Side effects:
* Read the code.
*
*----------------------------------------------------------------------
*/
static void
CursorInit(
TkDisplay *dispPtr) /* Display used to store thread-specific
* data. */
{
Tcl_InitHashTable(&dispPtr->cursorNameTable, TCL_STRING_KEYS);
Tcl_InitHashTable(&dispPtr->cursorDataTable, sizeof(DataKey)/sizeof(int));
/*
* The call below is tricky: can't use sizeof(IdKey) because it gets
* padded with extra unpredictable bytes on some 64-bit machines.
*/
/*
* Old code....
* Tcl_InitHashTable(&dispPtr->cursorIdTable, sizeof(Display *)
* /sizeof(int));
*
* The comment above doesn't make sense. However, XIDs should only be 32
* bits, by the definition of X, so the code above causes Tk to crash.
* Here is the real code:
*/
Tcl_InitHashTable(&dispPtr->cursorIdTable, TCL_ONE_WORD_KEYS);
dispPtr->cursorInit = 1;
}
/*
*----------------------------------------------------------------------
*
* TkDebugCursor --
*
* This function returns debugging information about a cursor.
*
* Results:
* The return value is a list with one sublist for each TkCursor
* corresponding to "name". Each sublist has two elements that contain
* the resourceRefCount and objRefCount fields from the TkCursor
* structure.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TkDebugCursor(
Tk_Window tkwin, /* The window in which the cursor will be used
* (not currently used). */
char *name) /* Name of the desired color. */
{
TkCursor *cursorPtr;
Tcl_HashEntry *hashPtr;
Tcl_Obj *resultPtr, *objPtr;
TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
if (!dispPtr->cursorInit) {
CursorInit(dispPtr);
}
resultPtr = Tcl_NewObj();
hashPtr = Tcl_FindHashEntry(&dispPtr->cursorNameTable, name);
if (hashPtr != NULL) {
cursorPtr = (TkCursor *) Tcl_GetHashValue(hashPtr);
if (cursorPtr == NULL) {
Tcl_Panic("TkDebugCursor found empty hash table entry");
}
for ( ; (cursorPtr != NULL); cursorPtr = cursorPtr->nextPtr) {
objPtr = Tcl_NewObj();
Tcl_ListObjAppendElement(NULL, objPtr,
Tcl_NewIntObj(cursorPtr->resourceRefCount));
Tcl_ListObjAppendElement(NULL, objPtr,
Tcl_NewIntObj(cursorPtr->objRefCount));
Tcl_ListObjAppendElement(NULL, resultPtr, objPtr);
}
}
return resultPtr;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/