XImage

XImage is the X client side storage mechanism for a X Window System pixel map. The structure of an XImage as defined by the X Window core protocol is the following:

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typedef struct XImage XImage;
struct XImage {
  int width, height;		/* size of image */
  int xoffset;			/* number of pixels offset in X direction */
  int format;			/* XYBitmap, XYPixmap, ZPixmap */
  char *data;			/* pointer to image data */
  int byte_order;		/* data byte order, LSBFirst, MSBFirst */
  int bitmap_unit;		/* quant. of scanline 8, 16, 32 */
  int bitmap_bit_order;		/* LSBFirst, MSBFirst */
  int bitmap_pad;		/* 8, 16, 32 either XY or ZPixmap */
  int depth;			/* depth of image */
  int bytes_per_line;		/* accelerator to next scanline */
  int bits_per_pixel;		/* bits per pixel (ZPixmap) */
  unsigned long red_mask;	/* bits in z arrangement */
  unsigned long green_mask;
  unsigned long blue_mask;
  XPointer obdata;		/* hook for the object routines to hang on */
  struct funcs {		/* image manipulation routines */
    XImage *(*create_image)();
    int (*destroy_image)();
    unsigned long (*get_pixel)();
    int (*put_pixel)();
    XImage *(*sub_image)();
    int (*add_pixel)();
  } f;
};

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