From http://www.jwz.org/xscreensaver/xscreensaver-5.31.tar.gz

[xscreensaver] / utils / xft.h

diff --git a/utils/xft.h b/utils/xft.h
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+++ b/utils/xft.h
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+/* xscreensaver, Copyright (c) 2014 Jamie Zawinski <jwz@jwz.org>
+ *
+ * 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.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ */
+
+/* Compatibility layer using XDrawString, XDrawString16() or Xutf8DrawString().
+   This layer is used by X11 systems without Xft, and by MacOS / iOS.
+ */
+
+#ifndef __XSCREENSAVER_XFT_H__
+#define __XSCREENSAVER_XFT_H__
+
+# ifdef HAVE_XFT
+
+#  include <X11/Xft/Xft.h>
+
+# else  /* !HAVE_XFT -- whole file */
+
+# ifdef HAVE_COCOA
+#  include "jwxyz.h"
+#elif defined(HAVE_ANDROID)
+#  include "jwxyz.h"
+# else
+#  include <X11/Xlib.h>
+# endif
+
+/* This doesn't seem to work right.  See comment in xft.c. */
+# undef HAVE_XUTF8DRAWSTRING
+
+
+# ifndef _Xconst
+#  define _Xconst const
+# endif
+
+typedef struct _XGlyphInfo {
+  unsigned short width, height;     /* bounding box of the ink */
+  short x, y;          /* distance from upper left of bbox to glyph origin. */
+  short xOff, yOff;    /* distance from glyph origin to next origin. */
+
+  /* These field names and values are, of course, arbitrarily different
+     from XCharStruct for no sensible reason.  Here's a translation key
+     between the two:
+
+     XGlyphInfo from XCharStruct:
+
+       g.x         =  -c.lbearing;
+       g.y         =   c.ascent;
+       g.xOff      =   c.width;
+       g.yOff      =   0;
+       g.width     =   c.rbearing - c.lbearing;
+       g.height    =   c.ascent   + c.descent;
+     
+     XCharStruct from XGlyphInfo:
+
+       c.lbearing  =  -g.x;
+       c.rbearing  =   g.width - g.x;
+       c.ascent    =   g.y;
+       c.descent   =   g.height - g.y;
+       c.width     =   g.xOff;
+   */
+
+} XGlyphInfo;
+
+
+typedef struct _XftFont {
+  XFontStruct *xfont;
+# ifdef HAVE_XUTF8DRAWSTRING
+  XFontSet fontset;
+# endif
+  char *name;
+  int ascent;
+  int descent;
+  int height;
+} XftFont;
+
+typedef struct {
+  unsigned short   red;
+  unsigned short   green;
+  unsigned short   blue;
+  unsigned short   alpha;
+} XRenderColor;
+
+typedef struct _XftColor {
+  unsigned long pixel;
+  XRenderColor color;
+} XftColor;
+
+typedef struct _XftDraw XftDraw;
+
+typedef unsigned char FcChar8;
+
+
+XftFont *XftFontOpenXlfd (Display *dpy, int screen, _Xconst char *xlfd);
+
+void XftFontClose (Display *dpy, XftFont *font);
+
+Bool XftColorAllocName (Display  *dpy,
+                        _Xconst Visual *visual,
+                        Colormap cmap,
+                        _Xconst char *name,
+                        XftColor *result);
+
+Bool XftColorAllocValue (Display *dpy,
+                         _Xconst Visual *visual,
+                         Colormap cmap,
+                         _Xconst XRenderColor *color,
+                         XftColor *result);
+
+void XftColorFree (Display *dpy,
+                   Visual *visual,
+                   Colormap cmap,
+                   XftColor *color);
+
+XftDraw *XftDrawCreate (Display   *dpy,
+                        Drawable  drawable,
+                        Visual    *visual,
+                        Colormap  colormap);
+
+void XftDrawDestroy (XftDraw *draw);
+
+void
+XftTextExtentsUtf8 (Display        *dpy,
+                   XftFont         *pub,
+                   _Xconst FcChar8 *string,
+                   int             len,
+                   XGlyphInfo      *extents);
+
+void
+XftDrawStringUtf8 (XftDraw         *draw,
+                  _Xconst XftColor *color,
+                  XftFont          *pub,
+                  int              x,
+                  int              y,
+                  _Xconst FcChar8  *string,
+                  int              len);
+
+# endif /* !HAVE_XFT */
+
+#endif /* __XSCREENSAVER_XFT_H__ */