XPutImage(3X11) X Version 11 (Release 4) XPutImage(3X11)
NAME
XPutImage, XGetImage, XGetSubImage - transfer images
SYNTAX
XPutImage(display, d, gc, image, src_x, src_y, dest_x,
dest_y, width, height)
Display *display;
Drawable d;
GC gc;
XImage *image;
int src_x, src_y;
int dest_x, dest_y;
unsigned int width, height;
XImage *XGetImage(display, d, x, y, width, height,
plane_mask, format)
Display *display;
Drawable d;
int x, y;
unsigned int width, height;
unsigned long plane_mask;
int format;
XImage *XGetSubImage(display, d, x, y, width, height,
plane_mask, format, dest_image, dest_x,
dest_y)
Display *display;
Drawable d;
int x, y;
unsigned int width, height;
unsigned long plane_mask;
int format;
XImage *dest_image;
int dest_x, dest_y;
ARGUMENTS
d Specifies the drawable.
dest_image
Specify the destination image.
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dest_x
dest_y Specify the x and y coordinates, which are
relative to the origin of the drawable and are the
coordinates of the subimage or which are relative
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
XYBitmap, XYPixmap, or ZPixmap.
gc Specifies the GC.
image Specifies the image you want combined with the
rectangle.
plane_mask
Specifies the plane mask.
src_x Specifies the offset in X from the left edge of
the image defined by the XImage data structure.
src_y 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
relative 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 must be one, or a BadMatch error results.
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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 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 components:
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 the plane_mask argument. The
function performs no range checking on the values in
plane_mask and ignores extraneous bits.
XGetImage returns the depth of the image to the depth member
of the XImage structure. The depth of the image is as
specified when the drawable was created, except when getting
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
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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 extraneous 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
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
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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. 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 correct
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 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
Xlib - C Language X Interface
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