XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
NAME
XPutImage, XGetImage, XGetSubImage - transfer images
SYNTAX
XPutImage(display, d, gc, image, srcx, srcy, destx,
desty, width, height)
Display *display;
Drawable d;
GC gc;
XImage *image;
int srcx, srcy;
int destx, desty;
unsigned int width, height;
XImage *XGetImage(display, d, x, y, width, height,
planemask, format)
Display *display;
Drawable d;
int x, y;
unsigned int width, height;
unsigned long planemask;
int format;
XImage *XGetSubImage(display, d, x, y, width, height,
planemask, format, destimage, destx,
desty)
Display *display;
Drawable d;
int x, y;
unsigned int width, height;
unsigned long planemask;
int format;
XImage *destimage;
int destx, desty;
ARGUMENTS
d Specifies the drawable.
destimage
Specify the destination image.
destx
desty Specify the x and y coordinates, which are rela-
tive to the origin of the drawable and are the
coordinates of the subimage or which are rela-
tive to the origin of the destination rectangle,
specify its upper-left corner, and determine
where the subimage is placed in the destination
image.
display Specifies the connection to the X server.
format Specifies the format for the image. You can
pass XYPixmap or ZPixmap.
X Version 11 Release 5 1
XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
gc Specifies the GC.
image Specifies the image you want combined with the
rectangle.
planemask
Specifies the plane mask.
srcx Specifies the offset in X from the left edge of
the image defined by the XImage data structure.
srcy Specifies the offset in Y from the top edge of
the image defined by the XImage data structure.
width
height Specify the width and height of the subimage,
which define the dimensions of the rectangle.
x
y Specify the x and y coordinates, which are rela-
tive to the origin of the drawable and define
the upper-left corner of the rectangle.
DESCRIPTION
The XPutImage function combines an image in memory with a
rectangle of the specified drawable. If XYBitmap format
is used, the depth of the image must be one, or a BadMatch
error results. The foreground pixel in the GC defines the
source for the one bits in the image, and the background
pixel defines the source for the zero bits. For XYPixmap
and ZPixmap, the depth of the image must match the depth
of the drawable, or a BadMatch error results. The section
of the image defined by the src_x, src_y, width, and
height arguments is drawn on the specified part of the
drawable.
This function uses these GC components: function, plane-
mask, subwindow-mode, clip-x-origin, clip-y-origin, and
clip-mask. It also uses these GC mode-dependent compo-
nents: foreground and background.
XPutImage can generate BadDrawable, BadGC, BadMatch, and
BadValue errors.
The XGetImage function returns a pointer to an XImage
structure. This structure provides you with the contents
of the specified rectangle of the drawable in the format
you specify. If the format argument is XYPixmap, the
image contains only the bit planes you passed to the
plane_mask argument. If the plane_mask argument only
requests a subset of the planes of the display, the depth
of the returned image will be the number of planes
requested. If the format argument is ZPixmap, XGetImage
returns as zero the bits in all planes not specified in
X Version 11 Release 5 2
XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
the plane_mask argument. The function performs no range
checking on the values in plane_mask and ignores extrane-
ous bits.
XGetImage returns the depth of the image to the depth mem-
ber of the XImage structure. The depth of the image is as
specified when the drawable was created, except when get-
ting a subset of the planes in XYPixmap format, when the
depth is given by the number of bits set to 1 in
plane_mask.
If the drawable is a pixmap, the given rectangle must be
wholly contained within the pixmap, or a BadMatch error
results. If the drawable is a window, the window must be
viewable, and it must be the case that if there were no
inferiors or overlapping windows, the specified rectangle
of the window would be fully visible on the screen and
wholly contained within the outside edges of the window,
or a BadMatch error results. Note that the borders of the
window can be included and read with this request. If the
window has backing-store, the backing-store contents are
returned for regions of the window that are obscured by
noninferior windows. If the window does not have backing-
store, the returned contents of such obscured regions are
undefined. The returned contents of visible regions of
inferiors of a different depth than the specified window's
depth are also undefined. The pointer cursor image is not
included in the returned contents. If a problem occurs,
XGetImage returns NULL.
XGetImage can generate BadDrawable, BadMatch, and BadValue
errors.
The XGetSubImage function updates dest_image with the
specified subimage in the same manner as XGetImage. If
the format argument is XYPixmap, the image contains only
the bit planes you passed to the plane_mask argument. If
the format argument is ZPixmap, XGetSubImage returns as
zero the bits in all planes not specified in the
plane_mask argument. The function performs no range
checking on the values in plane_mask and ignores extrane-
ous bits. As a convenience, XGetSubImage returns a
pointer to the same XImage structure specified by
dest_image.
The depth of the destination XImage structure must be the
same as that of the drawable. If the specified subimage
does not fit at the specified location on the destination
image, the right and bottom edges are clipped. If the
drawable is a pixmap, the given rectangle must be wholly
contained within the pixmap, or a BadMatch error results.
If the drawable is a window, the window must be viewable,
and it must be the case that if there were no inferiors or
overlapping windows, the specified rectangle of the window
X Version 11 Release 5 3
XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
would be fully visible on the screen and wholly contained
within the outside edges of the window, or a BadMatch
error results. If the window has backing-store, then the
backing-store contents are returned for regions of the
window that are obscured by noninferior windows. If the
window does not have backing-store, the returned contents
of such obscured regions are undefined. The returned con-
tents of visible regions of inferiors of a different depth
than the specified window's depth are also undefined. If
a problem occurs, XGetSubImage returns NULL.
XGetSubImage can generate BadDrawable, BadGC, BadMatch,
and BadValue errors.
DIAGNOSTICS
BadDrawable
A value for a Drawable argument does not name a
defined Window or Pixmap.
BadGC A value for a GContext argument does not name a
defined GContext.
BadMatch An InputOnly window is used as a Drawable.
BadMatch Some argument or pair of arguments has the cor-
rect type and range but fails to match in some
other way required by the request.
BadValue Some numeric value falls outside the range of
values accepted by the request. Unless a spe-
cific 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
Xlib - C Language X Interface
X Version 11 Release 5 4