R6.6 is the Xorg base-lineXORG-MAINXORG-STABLE

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+/* $Xorg: gridP.h,v 1.4 2001/02/09 02:05:41 xorgcvs Exp $ */
+/*
+
+Copyright 1993, 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.
+
+*/
+
+
+#ifndef _FontGridP_h_
+#define _FontGridP_h_
+
+#include "grid.h"
+
+typedef struct _FontGridClassPart { int dummy; } FontGridClassPart;
+
+typedef struct _FontGridClassRec {
+    CoreClassPart	core_class;
+    SimpleClassPart	simple_class;
+    FontGridClassPart	grid_class;
+} FontGridClassRec;
+extern FontGridClassRec fontgridClassRec;
+
+typedef struct _FontGridPart {
+    XFontStruct *	text_font;		/* font to display */
+    int			cell_cols, cell_rows;  /* number of cells */
+    int			cell_width, cell_height;  /* size of cell */
+    Pixel		foreground_pixel;	/* color of text */
+    Pixel		box_pixel;	/* for box_chars */
+    Boolean		center_chars;	/* center characters in grid */
+    Boolean		box_chars;	/* put box around logical width */
+    XtCallbackList	callbacks;	/* for notifying caller */
+    int			internal_pad;	/* extra padding inside grid */
+    Dimension		start_char;	/* first character of grid */
+    int			grid_width;	/* width of grid lines */
+    /* private data */
+    GC			text_gc;	/* printing text */
+    GC			box_gc;		/* for box_chars */
+    int			xoff, yoff;	/* extra offsets within grid */
+} FontGridPart;
+
+typedef struct _FontGridRec {
+    CorePart		core;
+    SimplePart		simple;
+    FontGridPart	fontgrid;
+} FontGridRec;
+
+#define DefaultCellWidth(fgw) (((fgw)->fontgrid.text_font->max_bounds.width) \
+			       + ((fgw)->fontgrid.internal_pad * 2))
+#define DefaultCellHeight(fgw) ((fgw)->fontgrid.text_font->ascent + \
+				(fgw)->fontgrid.text_font->descent + \
+				((fgw)->fontgrid.internal_pad * 2))
+
+
+#define CellWidth(fgw) (((int)(fgw)->core.width - (fgw)->fontgrid.grid_width) \
+			/ (fgw)->fontgrid.cell_cols \
+			- (fgw)->fontgrid.grid_width)
+#define CellHeight(fgw) (((int)(fgw)->core.height - (fgw)->fontgrid.grid_width)\
+			 / (fgw)->fontgrid.cell_rows \
+			 - (fgw)->fontgrid.grid_width)
+
+#endif /* !_FontGridP_h_ */