XCreateFontCursor(3X1RISC/os Reference ManXCreateFontCursor(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,
foreground_color, background_color, x, y)
Display *display;
Pixmap source;
Pixmap mask;
XColor *foreground_color;
XColor *background_color;
unsigned int x, y;
Cursor XCreateGlyphCursor(display, source_font, mask_font,
source_char, mask_char,
foreground_color,
background_color)
Display *display;
Font source_font, mask_font;
unsigned int source_char, mask_char;
XColor *foreground_color;
XColor *background_color;
ARGUMENTS
background_color
Specifies the RGB values for the background of the
source.
display Specifies the connection to the X server.
foreground_color
Specifies the RGB values for the foreground of the
source.
mask Specifies the cursor's source bits to be displayed
or None.
mask_char Specifies the glyph character for the mask.
mask_font Specifies the font for the mask glyph or None.
shape Specifies the shape of the cursor.
source Specifies the shape of the source cursor.
source_char
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XCreateFontCursor(3X1RISC/os Reference ManXCreateFontCursor(3X11)
Specifies the character glyph for the source.
source_font
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 custom-
ized 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 XCreatePixmap-
Cursor except that the source and mask bitmaps are obtained
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XCreateFontCursor(3X1RISC/os Reference ManXCreateFontCursor(3X11)
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 res-
triction 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 Bad-
Value 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 gen-
erate this error.
SEE ALSO
XDefineCursor(3X11), XLoadFont(3X11), XRecolorCursor(3X11)
Xlib - C Language X Interface
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