XCreateFontCursor(3X11) SDK X11 R4.11MU05 XCreateFontCursor(3X11)
NAME
XCreateFontCursor, XCreatePixmapCursor, XCreateGlyphCursor - create
cursors
SYNTAX
#include <X11/cursorfont.h>
Cursor XCreateFontCursor(display, shape)
Display *display;
unsigned int shape;
Cursor XCreatePixmapCursor(display, source, mask, foregroundcolor,
backgroundcolor, x, y)
Display *display;
Pixmap source;
Pixmap mask;
XColor *foregroundcolor;
XColor *backgroundcolor;
unsigned int x, y;
Cursor XCreateGlyphCursor(display, sourcefont, maskfont,
sourcechar, maskchar,
foregroundcolor, backgroundcolor)
Display *display;
Font sourcefont, maskfont;
unsigned int sourcechar, maskchar;
XColor *foregroundcolor;
XColor *backgroundcolor;
ARGUMENTS
backgroundcolor
Specifies the RGB values for the background of the source.
display Specifies the connection to the X server.
foregroundcolor
Specifies the RGB values for the foreground of the source.
mask Specifies the cursor's source bits to be displayed or None.
maskchar Specifies the glyph character for the mask.
maskfont Specifies the font for the mask glyph or None.
shape Specifies the shape of the cursor.
source Specifies the shape of the source cursor.
sourcechar
Specifies the character glyph for the source.
sourcefont
Specifies the font for the source glyph.
x
y Specify the x and y coordinates, which indicate the hotspot
relative to the source's origin.
DESCRIPTION
X provides a set of standard cursor shapes in a special font named
cursor. Applications are encouraged to use this interface for their
cursors because the font can be customized for the individual display
type. The shape argument specifies which glyph of the standard fonts
to use.
The hotspot comes from the information stored in the cursor font.
The initial colors of a cursor are a black foreground and a white
background (see XRecolorCursor).
XCreateFontCursor can generate BadAlloc and BadValue errors.
The XCreatePixmapCursor function creates a cursor and returns the
cursor ID associated with it. The foreground and background RGB
values must be specified using foreground_color and background_color,
even if the X server only has a StaticGray or GrayScale screen. The
foreground color is used for the pixels set to 1 in the source, and
the background color is used for the pixels set to 0. Both source
and mask, if specified, must have depth one (or a BadMatch error
results) but can have any root. The mask argument defines the shape
of the cursor. The pixels set to 1 in the mask define which source
pixels are displayed, and the pixels set to 0 define which pixels are
ignored. If no mask is given, all pixels of the source are
displayed. The mask, if present, must be the same size as the pixmap
defined by the source argument, or a BadMatch error results. The
hotspot must be a point within the source, or a BadMatch error
results.
The components of the cursor can be transformed arbitrarily to meet
display limitations. The pixmaps can be freed immediately if no
further explicit references to them are to be made. Subsequent
drawing in the source or mask pixmap has an undefined effect on the
cursor. The X server might or might not make a copy of the pixmap.
XCreatePixmapCursor can generate BadAlloc and BadPixmap errors.
The XCreateGlyphCursor function is similar to XCreatePixmapCursor
except that the source and mask bitmaps are obtained from the
specified font glyphs. The source_char must be a defined glyph in
source_font, or a BadValue error results. If mask_font is given,
mask_char must be a defined glyph in mask_font, or a BadValue error
results. The mask_font and character are optional. The origins of
the source_char and mask_char (if defined) glyphs are positioned
coincidently and define the hotspot. The source_char and mask_char
need not have the same bounding box metrics, and there is no
restriction on the placement of the hotspot relative to the bounding
boxes. If no mask_char is given, all pixels of the source are
displayed. You can free the fonts immediately by calling XFreeFont
if no further explicit references to them are to be made.
For 2-byte matrix fonts, the 16-bit value should be formed with the
byte1 member in the most-significant byte and the byte2 member in the
least-significant byte.
XCreateGlyphCursor can generate BadAlloc, BadFont, and BadValue
errors.
DIAGNOSTICS
BadAlloc The server failed to allocate the requested resource or
server memory.
BadFont A value for a Font or GContext argument does not name a
defined Font.
BadMatch Some argument or pair of arguments has the correct type and
range but fails to match in some other way required by the
request.
BadPixmap A value for a Pixmap argument does not name a defined
Pixmap.
BadValue Some numeric value falls outside the range of values
accepted by the request. Unless a specific range is
specified for an argument, the full range defined by the
argument's type is accepted. Any argument defined as a set
of alternatives can generate this error.
SEE ALSO
XDefineCursor(3X11), XLoadFont(3X11), XRecolorCursor(3X11)
Xlib - C Language X Interface
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