XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
NAME
XPutImage, XGetImage, XGetSubImage - transfer images
SYNTAX
int XPutImage(Display *display, Drawable d, GC gc, XImage
*image, int src_x, int src_y, int dest_x, int dest_y,
unsigned int width, unsigned int height);
XImage *XGetImage(Display *display, Drawable d, int x, int
y, unsigned int width, unsigned int height, unsigned
long plane_mask, int format);
XImage *XGetSubImage(Display *display, Drawable d, int x,
int y, unsigned int width, unsigned int height,
unsigned long plane_mask, int format, XImage
*dest_image, int dest_x, dest_y);
ARGUMENTS
d Specifies the drawable.
dest_image
Specifies the destination image. and are the coor-
dinates 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
dest_x
dest_y Specify the x and y coordinates, which are rela-
tive to the origin of the drawable.
display Specifies the connection to the X server.
format Specifies the format for the image. You can pass
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 structure.
src_y Specifies the offset in Y from the top edge of the
image defined by the XImage structure.
width
height Specify the width and height of the subimage,
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XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
which define the dimensions of the rectangle. and
define the upper-left corner of the rectangle
x
y Specify the x and y coordinates, which are rela-
tive to the origin of the drawable.
DESCRIPTION
The XPutImage function combines an image with a rectangle of
the specified drawable. 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. 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.
If the characteristics of the image (for example, byte_order
and bitmap_unit) differ from what the server requires, XPu-
tImage automatically makes the appropriate conversions.
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 struc-
ture. 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 con-
tains only the bit planes you passed to the plane_mask argu-
ment. 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 argu-
ment is ZPixmap, XGetImage returns as zero the bits in all
planes not specified in the plane_mask argument. The func-
tion 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 speci-
fied 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
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XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
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 Bad-
Match 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 win-
dows. 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 speci-
fied 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 argu-
ment 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 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 infe-
riors of a different depth than the specified window's depth
are also undefined. If a problem occurs, XGetSubImage
returns NULL.
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XPutImage(3X11) XLIB FUNCTIONS XPutImage(3X11)
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 gen-
erate this error.
SEE ALSO
Xlib - C Language X Interface
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