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/*
* tkimgUtils.tcl
*/
#include <string.h>
#include <stdlib.h>
#include "tkimg.h"
/*
* The variable "tkimg_initialized" contains flags indicating which
* version of Tcl or Perl we are running:
*
* IMG_PERL perl
* IMG_COMPOSITE Photo image type proc signatures are 8.4 or higher.
* IMG_NOPANIC Photo image type proc signatures are 8.5 or higher.
*
* These flags will be determined at runtime (except the IMG_PERL
* flag, for now), so we can use the same dynamic library for all
* Tcl/Tk versions (and for Perl/Tk in the future).
*
* The existence of the CPP macro _LANG implies usage in Perl/Tk.
*
* Img 1.4: Support for Tcl 8.2 and lower is dropped.
*/
int tkimg_initialized = 0;
int TkimgInitUtilities(
Tcl_Interp *interp
) {
#ifdef _LANG
tkimg_initialized = IMG_PERL;
#else
int major, minor, patchlevel, type;
tkimg_initialized = IMG_TCL;
Tcl_GetVersion(&major, &minor, &patchlevel, &type);
if ((major > 8) || ((major == 8) && (minor > 3))) {
tkimg_initialized |= IMG_COMPOSITE;
}
if ((major > 8) || ((major == 8) && (minor > 4))) {
tkimg_initialized |= IMG_NOPANIC;
}
#endif
return tkimg_initialized;
}
/*
*----------------------------------------------------------------------
*
* tkimg_GetStringFromObj --
*
* Returns the string representation's byte array pointer and length
* for an object.
*
* Results:
* Returns a pointer to the string representation of objPtr. If
* lengthPtr isn't NULL, the length of the string representation is
* stored at *lengthPtr. The byte array referenced by the returned
* pointer must not be modified by the caller. Furthermore, the
* caller must copy the bytes if they need to retain them since the
* object's string rep can change as a result of other operations.
* REMARK: This function reacts a little bit different than
* Tcl_GetStringFromObj():
* - objPtr is allowed to be NULL. In that case the NULL pointer
* will be returned, and the length will be reported to be 0;
* In the tkimg_ code there is never a distinction between en empty
* string and a NULL pointer, while the latter is easier to check
* for. That's the reason for this difference.
*
* Side effects:
* May call the object's updateStringProc to update the string
* representation from the internal representation.
*
*----------------------------------------------------------------------
*/
const char *tkimg_GetStringFromObj(
register Tcl_Obj *objPtr, /* Object whose string rep byte pointer
* should be returned, or NULL */
register int *lengthPtr /* If non-NULL, the location where the
* string rep's byte array length should be
* stored. If NULL, no length is stored. */
) {
if (!objPtr) {
if (lengthPtr) {
*lengthPtr = 0;
}
return NULL;
}
#ifdef _LANG
{
char *string = LangString((Arg) objPtr);
if (lengthPtr) {
*lengthPtr = string? strlen(string): 0;
}
return string;
}
#else /* _LANG */
return Tcl_GetStringFromObj(objPtr, lengthPtr);
#endif /* _LANG */
}
/*
*----------------------------------------------------------------------
*
* tkimg_GetByteArrayFromObj --
*
* Returns the binary representation and length
* for a byte array object.
*
* Results:
* Returns a pointer to the byte representation of objPtr. If
* lengthPtr isn't NULL, the length of the string representation is
* stored at *lengthPtr. The byte array referenced by the returned
* pointer must not be modified by the caller. Furthermore, the
* caller must copy the bytes if they need to retain them since the
* objects representation can change as a result of other operations.
*
* Side effects:
* May call the object's updateStringProc to update the string
* representation from the internal representation.
*
*----------------------------------------------------------------------
*/
unsigned char *tkimg_GetByteArrayFromObj(
register Tcl_Obj *objPtr, /**< Object whose string rep byte pointer
* should be returned, or NULL */
register int *lengthPtr /**< If non-NULL, the location where the
* string rep's byte array length should be
* stored. If NULL, no length is stored. */
) {
#ifdef _LANG
char *string = LangString((Arg) objPtr);
if (lengthPtr) {
*lengthPtr = string? strlen(string): 0;
}
return (unsigned char *) string;
#else /* _LANG */
return Tcl_GetByteArrayFromObj(objPtr, lengthPtr);
#endif /* _LANG */
}
/*
*----------------------------------------------------------------------
*
* tkimg_ListObjGetElements --
*
* Splits an object into its components.
*
* Results:
* If objPtr is a valid list (or can be converted to one),
* TCL_OK will be returned. The object will be split in
* its components.
* Otherwise TCL_ERROR is returned. If interp is not a NULL
* pointer, an error message will be left in it as well.
*
* Side effects:
* May call the object's updateStringProc to update the string
* representation from the internal representation.
*
*----------------------------------------------------------------------
*/
int tkimg_ListObjGetElements(
Tcl_Interp *interp,
Tcl_Obj *objPtr,
int *objc,
Tcl_Obj ***objv
) {
if (!objPtr) {
*objc = 0;
return TCL_OK;
}
return Tcl_ListObjGetElements(interp, objPtr, objc, objv);
}
/*
*----------------------------------------------------------------------
*
* tkimg_Fix*Proc --
*
* Various Compatibility functions
*
* Results:
* The functions below allow an image type to distinguish
* between a call made by Tk 8.3.2 or earlier (4 arguments), versus 8.3
* or later (3 arguments) and adapt at runtime. This adaption is done
* by shuffling the incoming arguments around to their correct positions.
*
* Side effects:
* S.a.
*
*----------------------------------------------------------------------
*/
void tkimg_FixChanMatchProc(
Tcl_Interp **interp,
Tcl_Channel *chan,
const char **file,
Tcl_Obj **format,
int **width,
int **height
) {
Tcl_Interp *tmp;
if (tkimg_initialized & IMG_PERL) {
return;
}
tmp = (Tcl_Interp *) *height;
*height = *width;
*width = (int *) *format;
*format = (Tcl_Obj *) *file;
*file = (const char *) *chan;
*chan = (Tcl_Channel) *interp;
*interp = tmp;
}
void tkimg_FixObjMatchProc(
Tcl_Interp **interp,
Tcl_Obj **data,
Tcl_Obj **format,
int **width,
int **height
) {
Tcl_Interp *tmp;
if (tkimg_initialized & IMG_PERL) {
return;
}
tmp = (Tcl_Interp *) *height;
*height = *width;
*width = (int *) *format;
*format = (Tcl_Obj *) *data;
*data = (Tcl_Obj *) *interp;
*interp = tmp;
}
void tkimg_FixStringWriteProc(
Tcl_DString *data,
Tcl_Interp **interp,
Tcl_DString **dataPtr,
Tcl_Obj **format,
Tk_PhotoImageBlock **blockPtr
) {
if (!*blockPtr) {
*blockPtr = (Tk_PhotoImageBlock *) *format;
*format = (Tcl_Obj *) *dataPtr;
*dataPtr = data;
Tcl_DStringInit(data);
}
}
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