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/*
* tkUnix.c --
*
* This file contains procedures that are UNIX/X-specific, and
* will probably have to be written differently for Windows or
* Macintosh platforms.
*
* Copyright (c) 1995 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: tkUnix.c,v 1.6 2004/10/26 13:15:09 dkf Exp $
*/
#include <tkInt.h>
/*
*----------------------------------------------------------------------
*
* TkGetServerInfo --
*
* Given a window, this procedure returns information about
* the window server for that window. This procedure provides
* the guts of the "winfo server" command.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkGetServerInfo(interp, tkwin)
Tcl_Interp *interp; /* The server information is returned in
* this interpreter's result. */
Tk_Window tkwin; /* Token for window; this selects a
* particular display and server. */
{
char buffer[8 + TCL_INTEGER_SPACE * 2];
char buffer2[TCL_INTEGER_SPACE];
sprintf(buffer, "X%dR%d ", ProtocolVersion(Tk_Display(tkwin)),
ProtocolRevision(Tk_Display(tkwin)));
sprintf(buffer2, " %d", VendorRelease(Tk_Display(tkwin)));
Tcl_AppendResult(interp, buffer, ServerVendor(Tk_Display(tkwin)),
buffer2, (char *) NULL);
}
/*
*----------------------------------------------------------------------
*
* TkGetDefaultScreenName --
*
* Returns the name of the screen that Tk should use during
* initialization.
*
* Results:
* Returns the argument or a string that should not be freed by
* the caller.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
CONST char *
TkGetDefaultScreenName(interp, screenName)
Tcl_Interp *interp; /* Interp used to find environment variables. */
CONST char *screenName; /* Screen name from command line, or NULL. */
{
if ((screenName == NULL) || (screenName[0] == '\0')) {
screenName = Tcl_GetVar2(interp, "env", "DISPLAY", TCL_GLOBAL_ONLY);
}
return screenName;
}
/*
*----------------------------------------------------------------------
*
* Tk_UpdatePointer --
*
* Unused function in UNIX
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tk_UpdatePointer(tkwin, x, y, state)
Tk_Window tkwin; /* Window to which pointer event
* is reported. May be NULL. */
int x, y; /* Pointer location in root coords. */
int state; /* Modifier state mask. */
{
/*
* This function intentionally left blank
*/
}
/*
*----------------------------------------------------------------------
*
* TkpBuildRegionFromAlphaData --
*
* Set up a rectangle of the given region based on the supplied
* alpha data.
*
* Results:
* None
*
* Side effects:
* The region is updated, with extra pixels added to it.
*
*----------------------------------------------------------------------
*/
void
TkpBuildRegionFromAlphaData(region, x, y, width, height, dataPtr,
pixelStride, lineStride)
TkRegion region;
unsigned int x, y; /* Where in region to update. */
unsigned int width, height; /* Size of rectangle to update. */
unsigned char *dataPtr; /* Data to read from. */
unsigned int pixelStride; /* num bytes from one piece of alpha
* data to the next in the line. */
unsigned int lineStride; /* num bytes from one line of alpha
* data to the next line. */
{
unsigned char *lineDataPtr;
unsigned int x1, y1, end;
XRectangle rect;
for (y1 = 0; y1 < height; y1++) {
lineDataPtr = dataPtr;
for (x1 = 0; x1 < width; x1 = end) {
/* search for first non-transparent pixel */
while ((x1 < width) && !*lineDataPtr) {
x1++;
lineDataPtr += pixelStride;
}
end = x1;
/* search for first transparent pixel */
while ((end < width) && *lineDataPtr) {
end++;
lineDataPtr += pixelStride;
}
if (end > x1) {
rect.x = x + x1;
rect.y = y + y1;
rect.width = end - x1;
rect.height = 1;
TkUnionRectWithRegion(&rect, region, region);
}
}
dataPtr += lineStride;
}
}
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