StrToCurs.c

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/* $Xorg: StrToCurs.c,v 1.4 2001/02/09 02:03:53 xorgcvs Exp $ */

/*

Copyright 1987, 1988, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

*/

/***********************************************************

Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/

/* $XFree86: xc/lib/Xmu/StrToCurs.c,v 1.11 2002/09/19 13:21:58 tsi Exp $ */

#include        <X11/Intrinsic.h>
#include        <X11/StringDefs.h>
#include        <X11/Xmu/Converters.h>
#include        <X11/Xmu/Drawing.h>
#include        <X11/Xmu/CurUtil.h>
#include        <X11/Xmu/CharSet.h>

#ifndef X_NOT_POSIX
#include <stdlib.h>
#ifdef _POSIX_SOURCE
#include <limits.h>
#else
#define _POSIX_SOURCE
#include <limits.h>
#undef _POSIX_SOURCE
#endif
#endif /* X_NOT_POSIX */
#ifndef PATH_MAX
#ifdef WIN32
#define PATH_MAX 512
#else
#include <sys/param.h>
#endif
#ifndef PATH_MAX
#ifdef MAXPATHLEN
#define PATH_MAX MAXPATHLEN
#else
#define PATH_MAX 1024
#endif
#endif
#endif /* PATH_MAX */

/* Kludge source to avoid encountering broken shared library linkers
   which insist on resolving references unused by the application,
   and broken object file formats that don't correctly distinguish
   references to procedures from references to data.
 */
#if defined(SUNSHLIB) || defined(SVR4)
#define XMU_KLUDGE
#endif

/*
 * XmuConvertStringToCursor:
 *
 * allows String to specify a standard cursor name (from cursorfont.h), a
 * font name and glyph index of the form "FONT fontname index [[font] index]", 
 * or a bitmap file name (absolute, or relative to the global resource
 * bitmapFilePath, class BitmapFilePath).  If the resource is not
 * defined, the default value is the build symbol BITMAPDIR.
 *
 * shares lots of code with XmuCvtStringToPixmap, but unfortunately
 * can't use it as the hotspot info is lost.
 *
 * To use, include the following in your ClassInitialize procedure:

static XtConvertArgRec screenConvertArg[] = {
    {XtBaseOffset, (XtPointer) XtOffsetOf(WidgetRec, core.screen),
     sizeof(Screen *)}
};

    XtAddConverter(XtRString, XtRCursor, XmuCvtStringToCursor,      
                   screenConvertArg, XtNumber(screenConvertArg));
 *
 */

#define done(address, type) \
        { (*toVal).size = sizeof(type); (*toVal).addr = (XPointer) address; }

#define FONTSPECIFIER           "FONT "

/*ARGSUSED*/
void
XmuCvtStringToCursor(XrmValuePtr args, Cardinal *num_args,
                     XrmValuePtr fromVal, XrmValuePtr toVal)
{
    static Cursor cursor;               /* static for cvt magic */
    char *name = (char *)fromVal->addr;
    Screen *screen;
    register int i;
    char maskname[PATH_MAX];
    Pixmap source, mask = 0;
    /* XXX - make fg/bg resources */
    static XColor bgColor = {0, 0xffff, 0xffff, 0xffff};
    static XColor fgColor = {0, 0, 0, 0};
    int xhot, yhot;
    int len;


    if (*num_args != 1)
     XtErrorMsg("wrongParameters","cvtStringToCursor","XtToolkitError",
             "String to cursor conversion needs screen argument",
              (String *)NULL, (Cardinal *)NULL);

    if (XmuCompareISOLatin1(name, "None") == 0)
      {
        cursor = None;
        done(&cursor, Cursor);
        return;
      }

    screen = *((Screen **) args[0].addr);

    if (0 == strncmp(FONTSPECIFIER, name, strlen(FONTSPECIFIER))) {
        char source_name[PATH_MAX], mask_name[PATH_MAX];
        int source_char, mask_char, fields;
        Font source_font, mask_font;
        XrmValue fromString, toFont;
        XrmValue cvtArg;
        Boolean success;
        Display *dpy = DisplayOfScreen(screen);
        char *strspec = NULL;
#ifdef XMU_KLUDGE
        Cardinal num;
#endif

        strspec = XtMalloc(strlen("FONT %s %d %s %d") + 21);
        sprintf(strspec, "FONT %%%lds %%d %%%lds %%d",
                (unsigned long)sizeof(source_name) - 1,
                (unsigned long)sizeof(mask_name) - 1);
        fields = sscanf(name, strspec,
                        source_name, &source_char,
                        mask_name, &mask_char);
        XtFree(strspec);
        if (fields < 2) {
            XtStringConversionWarning(name, XtRCursor);
            return;
        }

        fromString.addr = source_name;
        fromString.size = strlen(source_name) + 1;
        toFont.addr = (XPointer) &source_font;
        toFont.size = sizeof(Font);
        cvtArg.addr = (XPointer) &dpy;
        cvtArg.size = sizeof(Display *);
        /* XXX using display of screen argument as message display */
#ifdef XMU_KLUDGE
        /* XXX Sacrifice caching */
        num = 1;
        success = XtCvtStringToFont(dpy, &cvtArg, &num, &fromString, &toFont,
                                    NULL);
#else
        success = XtCallConverter(dpy, XtCvtStringToFont, &cvtArg,
                                  (Cardinal)1, &fromString, &toFont, NULL);
#endif
        if (!success) {
            XtStringConversionWarning(name, XtRCursor);
            return;
        }

        switch (fields) {
          case 2:               /* defaulted mask font & char */
            mask_font = source_font;
            mask_char = source_char;
            break;

          case 3:               /* defaulted mask font */
            mask_font = source_font;
            mask_char = atoi(mask_name);
            break;

          case 4:               /* specified mask font & char */
            fromString.addr = mask_name;
            fromString.size = strlen(mask_name) + 1;
            toFont.addr = (XPointer) &mask_font;
            toFont.size = sizeof(Font);
            /* XXX using display of screen argument as message display */
#ifdef XMU_KLUDGE
            /* XXX Sacrifice caching */
            num = 1;
            success = XtCvtStringToFont(dpy, &cvtArg, &num, &fromString,
                                        &toFont, NULL);
#else
            success = XtCallConverter(dpy, XtCvtStringToFont, &cvtArg,
                                      (Cardinal)1, &fromString, &toFont, NULL);
#endif
            if (!success) {
                XtStringConversionWarning(name, XtRCursor);
                return;
            }
        }

        cursor = XCreateGlyphCursor( DisplayOfScreen(screen), source_font,
                                     mask_font, source_char, mask_char,
                                     &fgColor, &bgColor );
        done(&cursor, Cursor);
        return;
    }

    i = XmuCursorNameToIndex (name);
    if (i != -1) {
        cursor = XCreateFontCursor (DisplayOfScreen(screen), i);
        done(&cursor, Cursor);
        return;
    }

    if ((source = XmuLocateBitmapFile (screen, name, 
                                       maskname, (sizeof maskname) - 4,
                                       NULL, NULL, &xhot, &yhot)) == None) {
        XtStringConversionWarning (name, XtRCursor);
        cursor = None;
        done(&cursor, Cursor);
        return;
    }
    len = strlen (maskname);
    for (i = 0; i < 2; i++) {
        strcpy (maskname + len, i == 0 ? "Mask" : "msk");
        if ((mask = XmuLocateBitmapFile (screen, maskname, NULL, 0, 
                                         NULL, NULL, NULL, NULL)) != None)
          break;
    }

    cursor = XCreatePixmapCursor( DisplayOfScreen(screen), source, mask,
                                  &fgColor, &bgColor, xhot, yhot );
    XFreePixmap( DisplayOfScreen(screen), source );
    if (mask != None) XFreePixmap( DisplayOfScreen(screen), mask );

    done(&cursor, Cursor);
}

#define new_done(type, value) \
        {                                                       \
            if (toVal->addr != NULL) {                          \
                if (toVal->size < sizeof(type)) {               \
                    toVal->size = sizeof(type);                 \
                    return False;                               \
                }                                               \
                *(type*)(toVal->addr) = (value);                \
            }                                                   \
            else {                                              \
                static type static_val;                         \
                static_val = (value);                           \
                toVal->addr = (XPointer)&static_val;            \
            }                                                   \
            toVal->size = sizeof(type);                         \
            return True;                                        \
        }

/*      Function Name: XmuCvtStringToColorCursor
 *      Description: Converts a string into a colored cursor.
 *      Arguments: dpy
 *                 args - an argument list (see below).
 *                 num_args - number of elements in the argument list.
 *                 fromVal - value to convert from.
 *                 toVal - value to convert to.
 *                 data
 *      Returns:   True or False
 */

/*ARGSUSED*/
Boolean
XmuCvtStringToColorCursor(Display *dpy, XrmValuePtr args, Cardinal *num_args,
                          XrmValuePtr fromVal, XrmValuePtr toVal,
                          XtPointer *converter_data)
{
    Cursor cursor;
    Screen *screen;
    Pixel fg, bg;
    Colormap c_map;
    XColor colors[2];
    Cardinal number;
    XrmValue ret_val;

    if (*num_args != 4) {
        XtAppWarningMsg(XtDisplayToApplicationContext(dpy),
            "wrongParameters","cvtStringToColorCursor","XmuError",
            "String to color cursor conversion needs four arguments",
            (String *)NULL, (Cardinal *)NULL);
        return False;
    }

    screen = *((Screen **) args[0].addr);
    fg = *((Pixel *) args[1].addr);
    bg = *((Pixel *) args[2].addr);
    c_map = *((Colormap *) args[3].addr);

    number = 1;
    XmuCvtStringToCursor(args, &number, fromVal, &ret_val);
    
    cursor = *((Cursor *) ret_val.addr);

    if (cursor == None || (fg == BlackPixelOfScreen(screen)
                           && bg == WhitePixelOfScreen(screen)))
        new_done(Cursor, cursor);

    colors[0].pixel = fg;
    colors[1].pixel = bg;

    XQueryColors (dpy, c_map, colors, 2);
    XRecolorCursor(dpy, cursor, colors, colors + 1);
    new_done(Cursor, cursor);
}

    
    

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