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Diffstat (limited to 'utils/xft.h')
| -rw-r--r-- | utils/xft.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/utils/xft.h b/utils/xft.h new file mode 100644 index 0000000..385e28b --- /dev/null +++ b/utils/xft.h @@ -0,0 +1,167 @@ +/* xscreensaver, Copyright (c) 2014-2015 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__ + +/* The XGlyphInfo field names and values are, of course, arbitrarily + different from XCharStruct for no sensible reason. These macros + translate between them. + */ + +# define XGlyphInfo_to_XCharStruct(G,C) do { \ + (C).lbearing = -(G).x; \ + (C).rbearing = (G).width - (G).x; \ + (C).ascent = (G).y; \ + (C).descent = (G).height - (G).y; \ + (C).width = (G).xOff; \ +} while (0) + +# define XCharStruct_to_XGlyphInfo(C,G) do { \ + (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; \ +} while (0) + +/* Xutf8TextExtents returns a bounding box in an XRectangle, which + conveniently interprets everything in the opposite direction + from XGlyphInfo! + */ +# define XCharStruct_to_XmbRectangle(C,R) do { \ + (R).x = (C).lbearing; \ + (R).y = -(C).ascent; \ + (R).width = (C).rbearing - (C).lbearing; \ + (R).height = (C).ascent + (C).descent; \ +} while (0) + +# define XmbRectangle_to_XCharStruct(R,C,ADV) do { \ + (C).lbearing = (R).x; \ + (C).rbearing = (R).width + (R).x; \ + (C).ascent = -(R).y; \ + (C).descent = (R).height + (R).y; \ + (C).width = (ADV); \ +} while (0) + + +# ifdef HAVE_XFT + +# include <X11/Xft/Xft.h> + +# else /* !HAVE_XFT -- the rest of the 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 under X11. See comment in xft.c. */ +# ifndef HAVE_COCOA +# undef HAVE_XUTF8DRAWSTRING +# endif + + +# 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. */ +} 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); +#define XftFontOpenName XftFontOpenXlfd + +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__ */ |