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XCreateImage(3X11)		     X11R5		    XCreateImage(3X11)

NAME
       XCreateImage, XGetPixel, XPutPixel, XSubImage, XAddPixel, XDestroyImage
       - image utilities

SYNTAX
       XImage *XCreateImage(display, visual, depth, format, offset, data,
       width, height, bitmap_pad,
			       bytes_per_line)
	     Display *display;
	     Visual *visual;
	     unsigned int depth;
	     int format;
	     int offset;
	     char *data;
	     unsigned int width;
	     unsigned int height;
	     int bitmap_pad;
	     int bytes_per_line;

       unsigned long XGetPixel(ximage, x, y)
	     XImage *ximage;
	     int x;
	     int y;

       XPutPixel(ximage, x, y, pixel)
	     XImage *ximage;
	     int x;
	     int y;
	     unsigned long pixel;

       XImage *XSubImage(ximage, x, y, subimage_width, subimage_height)
	     XImage *ximage;
	     int x;
	     int y;
	     unsigned int subimage_width;
	     unsigned int subimage_height;

       XAddPixel(ximage, value)
	     XImage *ximage;
	     long value;

       XDestroyImage(ximage)
	       XImage *ximage;

ARGUMENTS
       bitmap_pad
		 Specifies the quantum of a scanline (8, 16, or 32).  In other
		 words, the start of one scanline is separated in client mem‐
		 ory from the start of the next scanline by an integer multi‐
		 ple of this many bits.

       bytes_per_line
		 Specifies the number of bytes in the client image between the
		 start of one scanline and the start of the next.

       data	 Specifies the image data.

       depth	 Specifies the depth of the image.

       display	 Specifies the connection to the X server.

       format	 Specifies the format for the image.  You can pass or

       height	 Specifies the height of the image, in pixels.

       offset	 Specifies the number of pixels to ignore at the beginning of
		 the scanline.

       pixel	 Specifies the new pixel value.

       subimage_height
		 Specifies the height of the new subimage, in pixels.

       subimage_width
		 Specifies the width of the new subimage, in pixels.

       value	 Specifies the constant value that is to be added.

       visual	 Specifies the structure.

       width	 Specifies the width of the image, in pixels.

       ximage	 Specifies the image.

       x
       y	 Specify the x and y coordinates.

DESCRIPTION
       The function allocates the memory needed for an structure for the spec‐
       ified display but does not allocate space for the image itself.
       Rather, it initializes the structure byte-order, bit-order, and bitmap-
       unit values from the display and returns a pointer to the structure.
       The red, green, and blue mask values are defined for Z format images
       only and are derived from the structure passed in.  Other values also
       are passed in.  The offset permits the rapid displaying of the image
       without requiring each scanline to be shifted into position.  If you
       pass a zero value in bytes_per_line, Xlib assumes that the scanlines
       are contiguous in memory and calculates the value of bytes_per_line
       itself.

       Note that when the image is created using or the destroy procedure that
       the function calls frees both the image structure and the data pointed
       to by the image structure.

       The basic functions used to get a pixel, set a pixel, create a subim‐
       age, and add a constant value to an image are defined in the image
       object.	The functions in this section are really macro invocations of
       the functions in the image object and are defined in

       The function returns the specified pixel from the named image.  The
       pixel value is returned in normalized format (that is, the least-sig‐
       nificant byte of the long is the least-significant byte of the pixel).
       The image must contain the x and y coordinates.

       The function overwrites the pixel in the named image with the specified
       pixel value.  The input pixel value must be in normalized format (that
       is, the least-significant byte of the long is the least-significant
       byte of the pixel).  The image must contain the x and y coordinates.

       The function creates a new image that is a subsection of an existing
       one.  It allocates the memory necessary for the new structure and
       returns a pointer to the new image.  The data is copied from the source
       image, and the image must contain the rectangle defined by x, y, subim‐
       age_width, and subimage_height.

       The function adds a constant value to every pixel in an image.  It is
       useful when you have a base pixel value from allocating color resources
       and need to manipulate the image to that form.

       The function deallocates the memory associated with the structure.

SEE ALSO
       XPutImage(3X11)
       Xlib - C Language X Interface

							    XCreateImage(3X11)
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