--- a/src/glyphs-shared.c	Sun Jun 03 14:25:45 2001 +0000
+++ b/src/glyphs-shared.c	Mon Jun 04 17:00:02 2001 +0000
@@ -1,4 +1,4 @@
-/* mswindows-specific glyph objects.
+/* Routines shared between window-system backends for glyph objects.
    Copyright (C) 1993, 1994 Free Software Foundation, Inc.
    Copyright (C) 1995 Board of Trustees, University of Illinois.
    Copyright (C) 1995 Tinker Systems
@@ -95,6 +95,240 @@
   }
 }
 
+/* Originally from xmu.c, but is now shared across X11, GTK, and MSW. */
+/*
+ * Based on an optimized version provided by Jim Becker, August 5, 1988.
+ */
+
+
+#ifndef BitmapSuccess
+#define BitmapSuccess           0
+#define BitmapOpenFailed        1
+#define BitmapFileInvalid       2
+#define BitmapNoMemory          3
+#endif
+
+#define MAX_SIZE 255
+
+/* shared data for the image read/parse logic */
+static short hexTable[256];		/* conversion value */
+static int hex_initialized;	/* easier to fill in at run time */
+
+
+/*
+ *	Table index for the hex values. Initialized once, first time.
+ *	Used for translation value or delimiter significance lookup.
+ */
+static void initHexTable (void)
+{
+    /*
+     * We build the table at run time for several reasons:
+     *
+     *     1.  portable to non-ASCII machines.
+     *     2.  still reentrant since we set the init flag after setting table.
+     *     3.  easier to extend.
+     *     4.  less prone to bugs.
+     */
+    hexTable['0'] = 0;	hexTable['1'] = 1;
+    hexTable['2'] = 2;	hexTable['3'] = 3;
+    hexTable['4'] = 4;	hexTable['5'] = 5;
+    hexTable['6'] = 6;	hexTable['7'] = 7;
+    hexTable['8'] = 8;	hexTable['9'] = 9;
+    hexTable['A'] = 10;	hexTable['B'] = 11;
+    hexTable['C'] = 12;	hexTable['D'] = 13;
+    hexTable['E'] = 14;	hexTable['F'] = 15;
+    hexTable['a'] = 10;	hexTable['b'] = 11;
+    hexTable['c'] = 12;	hexTable['d'] = 13;
+    hexTable['e'] = 14;	hexTable['f'] = 15;
+
+    /* delimiters of significance are flagged w/ negative value */
+    hexTable[' '] = -1;	hexTable[','] = -1;
+    hexTable['}'] = -1;	hexTable['\n'] = -1;
+    hexTable['\t'] = -1;
+
+    hex_initialized = 1;
+}
+
+/*
+ *	read next hex value in the input stream, return -1 if EOF
+ */
+static int NextInt (FILE *fstream)
+{
+    int	ch;
+    int	value = 0;
+    int gotone = 0;
+    int done = 0;
+
+    /* loop, accumulate hex value until find delimiter  */
+    /* skip any initial delimiters found in read stream */
+
+    while (!done) {
+	ch = getc(fstream);
+	if (ch == EOF) {
+	    value	= -1;
+	    done++;
+	} else {
+	    /* trim high bits, check type and accumulate */
+	    ch &= 0xff;
+	    if (isascii(ch) && isxdigit(ch)) {
+		value = (value << 4) + hexTable[ch];
+		gotone++;
+	    } else if ((hexTable[ch]) < 0 && gotone)
+	      done++;
+	}
+    }
+    return value;
+}
+
+
+/*
+ * The data returned by the following routine is always in left-most byte
+ * first and left-most bit first.  If it doesn't return BitmapSuccess then
+ * its arguments won't have been touched.  This routine should look as much
+ * like the Xlib routine XReadBitmapfile as possible.
+ */
+int read_bitmap_data (FILE* fstream, unsigned int *width,
+		      unsigned int *height, UChar_Binary **datap,
+		      int *x_hot, int *y_hot)
+{
+    UChar_Binary *data = NULL;		/* working variable */
+    char line[MAX_SIZE];		/* input line from file */
+    int size;				/* number of bytes of data */
+    char name_and_type[MAX_SIZE];	/* an input line */
+    char *type;				/* for parsing */
+    int value;				/* from an input line */
+    int version10p;			/* boolean, old format */
+    int padding;			/* to handle alignment */
+    int bytes_per_line;			/* per scanline of data */
+    unsigned int ww = 0;		/* width */
+    unsigned int hh = 0;		/* height */
+    int hx = -1;			/* x hotspot */
+    int hy = -1;			/* y hotspot */
+
+#ifndef Xmalloc
+#define Xmalloc(size) malloc(size)
+#endif
+
+    /* first time initialization */
+    if (!hex_initialized) initHexTable();
+
+    /* error cleanup and return macro	*/
+#define	RETURN(code) { if (data) free (data); return code; }
+
+    while (fgets(line, MAX_SIZE, fstream)) {
+	if (strlen(line) == MAX_SIZE-1) {
+	    RETURN (BitmapFileInvalid);
+	}
+	if (sscanf(line,"#define %s %d",name_and_type,&value) == 2) {
+	    if (!(type = strrchr(name_and_type, '_')))
+	      type = name_and_type;
+	    else
+	      type++;
+
+	    if (!strcmp("width", type))
+	      ww = (unsigned int) value;
+	    if (!strcmp("height", type))
+	      hh = (unsigned int) value;
+	    if (!strcmp("hot", type)) {
+		if (type-- == name_and_type || type-- == name_and_type)
+		  continue;
+		if (!strcmp("x_hot", type))
+		  hx = value;
+		if (!strcmp("y_hot", type))
+		  hy = value;
+	    }
+	    continue;
+	}
+
+	if (sscanf(line, "static short %s = {", name_and_type) == 1)
+	  version10p = 1;
+	else if (sscanf(line,"static unsigned char %s = {",name_and_type) == 1)
+	  version10p = 0;
+	else if (sscanf(line, "static char %s = {", name_and_type) == 1)
+	  version10p = 0;
+	else
+	  continue;
+
+	if (!(type = strrchr(name_and_type, '_')))
+	  type = name_and_type;
+	else
+	  type++;
+
+	if (strcmp("bits[]", type))
+	  continue;
+
+	if (!ww || !hh)
+	  RETURN (BitmapFileInvalid);
+
+	if ((ww % 16) && ((ww % 16) < 9) && version10p)
+	  padding = 1;
+	else
+	  padding = 0;
+
+	bytes_per_line = (ww+7)/8 + padding;
+
+	size = bytes_per_line * hh;
+	data = (UChar_Binary *) Xmalloc ((unsigned int) size);
+	if (!data)
+	  RETURN (BitmapNoMemory);
+
+	if (version10p) {
+	    UChar_Binary *ptr;
+	    int bytes;
+
+	    for (bytes=0, ptr=data; bytes<size; (bytes += 2)) {
+		if ((value = NextInt(fstream)) < 0)
+		  RETURN (BitmapFileInvalid);
+		*(ptr++) = value;
+		if (!padding || ((bytes+2) % bytes_per_line))
+		  *(ptr++) = value >> 8;
+	    }
+	} else {
+	    UChar_Binary *ptr;
+	    int bytes;
+
+	    for (bytes=0, ptr=data; bytes<size; bytes++, ptr++) {
+		if ((value = NextInt(fstream)) < 0)
+		  RETURN (BitmapFileInvalid);
+		*ptr=value;
+	    }
+	}
+	break;
+    }					/* end while */
+
+    if (data == NULL) {
+	RETURN (BitmapFileInvalid);
+    }
+
+    *datap = data;
+    data = NULL;
+    *width = ww;
+    *height = hh;
+    if (x_hot) *x_hot = hx;
+    if (y_hot) *y_hot = hy;
+
+    RETURN (BitmapSuccess);
+}
+
+
+int read_bitmap_data_from_file (const char *filename,
+			       /* Remaining args are RETURNED */
+			       unsigned int *width,
+			       unsigned int *height,
+			       UChar_Binary **datap,
+			       int *x_hot, int *y_hot)
+{
+    FILE *fstream;
+    int status;
+
+    if ((fstream = fopen (filename, "r")) == NULL) {
+	return BitmapOpenFailed;
+    }
+    status = read_bitmap_data (fstream, width, height, datap, x_hot, y_hot);
+    fclose (fstream);
+    return status;
+}
+
 void
 syms_of_glyphs_shared (void)
 {