Tk Source Code

 * data. In this case, it is used to contain references to selected
 * Tcl_ObjTypes that we can use as screen distances without conversion. The
 * "dataKey" below is used to locate the ThreadSpecificData for the current
 * thread.
 */

typedef struct ThreadSpecificData {
    const Tcl_ObjType *doubleTypePtr;
    const Tcl_ObjType *intTypePtr;
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * The following structure is the internal representation for mm objects.
 */

} WindowRep;

/*
 * Prototypes for functions defined later in this file:
 */

static void		DupMMInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr);
static void		DupPixelInternalRep(Tcl_Obj *srcPtr, Tcl_Obj*copyPtr);
static void		DupWindowInternalRep(Tcl_Obj *srcPtr,Tcl_Obj*copyPtr);
static void		FreeMMInternalRep(Tcl_Obj *objPtr);
static void		FreePixelInternalRep(Tcl_Obj *objPtr);
static void		FreeWindowInternalRep(Tcl_Obj *objPtr);
static void		UpdateStringOfMM(Tcl_Obj *objPtr);
static int		SetMMFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static int		SetPixelFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static int		SetWindowFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);

GetPixelsFromObjEx(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,
    Tcl_Obj *objPtr,		/* The object from which to get pixels. */
    int *intPtr,
    double *dblPtr)		/* Places to store resulting pixels. */
{
    int result, fresh;
    double d;
    PixelRep *pixelPtr;
    static const double bias[] = {
	1.0,	10.0,	25.4,	0.35278 /*25.4 / 72.0*/
    };

    /*
     * Special hacks where the type of the object is known to be something
     * that is just numeric and cannot require distance conversion. This pokes
     * holes in Tcl's abstractions, but they are just for optimization, not
     * semantics.
     */

    if (objPtr->typePtr != &pixelObjType) {
	ThreadSpecificData *tsdPtr =
		Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

	if (tsdPtr->doubleTypePtr == NULL) {
	    tsdPtr->doubleTypePtr = Tcl_GetObjType("double");
	    tsdPtr->intTypePtr = Tcl_GetObjType("int");
	}

		*dblPtr = (double) (*intPtr);
	    }
	    return TCL_OK;
	}
    }

 retry:
    fresh = (objPtr->typePtr != &pixelObjType);
    if (fresh) {
	result = SetPixelFromAny(interp, objPtr);
	if (result != TCL_OK) {
	    return result;
	}



    }

    if (SIMPLE_PIXELREP(objPtr)) {
	*intPtr = GET_SIMPLEPIXEL(objPtr);
	if (dblPtr) {
	    *dblPtr = (double) (*intPtr);
	}
    } else {
	pixelPtr = GET_COMPLEXPIXEL(objPtr);
	if ((!fresh) && (pixelPtr->tkwin != tkwin)) {

	    /*
	     * In the case of exo-screen conversions of non-pixels, we force a
	     * recomputation from the string.
	     */

	    FreePixelInternalRep(objPtr);
	    goto retry;
	}
	if ((pixelPtr->tkwin != tkwin) || dblPtr) {
	    d = pixelPtr->value;
	    if (pixelPtr->units >= 0) {
		d *= bias[pixelPtr->units] * WidthOfScreen(Tk_Screen(tkwin));
		d /= WidthMMOfScreen(Tk_Screen(tkwin));
	    }
	    if (d < 0) {
		pixelPtr->returnValue = (int) (d - 0.5);
	    } else {
		pixelPtr->returnValue = (int) (d + 0.5);
	    }
	    pixelPtr->tkwin = tkwin;
	    if (dblPtr) {
		*dblPtr = d;
	    }
	}
	*intPtr = pixelPtr->returnValue;
    }
    return TCL_OK;
}


int
Tk_GetPixelsFromObj(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,
    Tcl_Obj *objPtr,		/* The object from which to get pixels. */
    int *intPtr)		/* Place to store resulting pixels. */
{
    return GetPixelsFromObjEx(interp, tkwin, objPtr, intPtr, NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetDoublePixelsFromObj --
 *

Tk_GetDoublePixelsFromObj(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,
    Tcl_Obj *objPtr,		/* The object from which to get pixels. */
    double *doublePtr)		/* Place to store resulting pixels. */
{
    double d;
    int result, val;

    result = GetPixelsFromObjEx(interp, tkwin, objPtr, &val, &d);
    if (result != TCL_OK) {
	return result;
    }
    if (objPtr->typePtr == &pixelObjType && !SIMPLE_PIXELREP(objPtr)) {
	PixelRep *pixelPtr = GET_COMPLEXPIXEL(objPtr);

	if (pixelPtr->units >= 0) {
	    /*
	     * Internally "shimmer" to pixel units.
	     */

	    pixelPtr->units = -1;
	    pixelPtr->value = d;
	}
    }
    *doublePtr = d;
    return TCL_OK;
}

/*

    int *allPtr)		/* Write the total padding here */
{
    int firstInt, secondInt;    /* The two components of the padding */
    int objc;			/* The length of the list (should be 1 or 2) */
    Tcl_Obj **objv;		/* The objects in the list */

    /*
     * Check for a common case where a single object would otherwise be
     * shimmered between a list and a pixel spec.
     */

    if (specObj->typePtr == &pixelObjType) {
	if (Tk_GetPixelsFromObj(interp, tkwin, specObj, &firstInt) != TCL_OK){
	    Tcl_ResetResult(interp);
	    Tcl_AppendResult(interp, "bad pad value \"",
		    Tcl_GetString(specObj),
		    "\": must be positive screen distance", NULL);
	    return TCL_ERROR;
	}
	secondInt = firstInt;