XCreateColormap 3X11 __xorgversion__ XLIB FUNCTIONS XCreateColormap XCopyColormapAndFree XFreeColormap XColor create, copy, or destroy colormaps and color structure Colormap XCreateColormap ( Display *display , Window w , Visual *visual , int alloc ,); Colormap XCopyColormapAndFree ( Display *display , Colormap colormap ); int XFreeColormap ( Display *display , Colormap colormap ); alloc Specifies the colormap entries to be allocated. You can pass  AllocNone  or  AllocAll . colormap Specifies the colormap that you want to create, copy, set, or destroy. display Specifies the connection to the X server. visual Specifies a visual type supported on the screen. If the visual type is not one supported by the screen, a  BadMatch  error results. w Specifies the window on whose screen you want to create a colormap. The  XCreateColormap  function creates a colormap of the specified visual type for the screen on which the specified window resides and returns the colormap ID associated with it. Note that the specified window is only used to determine the screen. The initial values of the colormap entries are undefined for the visual classes  GrayScale ,  PseudoColor , and  DirectColor . For  StaticGray ,  StaticColor , and  TrueColor , the entries have defined values, but those values are specific to the visual and are not defined by X. For  StaticGray ,  StaticColor , and  TrueColor , alloc must be  AllocNone , or a  BadMatch  error results. For the other visual classes, if alloc is  AllocNone , the colormap initially has no allocated entries, and clients can allocate them. For information about the visual types, see section 3.1. If alloc is  AllocAll , the entire colormap is allocated writable. The initial values of all allocated entries are undefined. For  GrayScale  and  PseudoColor , the effect is as if an  XAllocColorCells  call returned all pixel values from zero to N - 1, where N is the colormap entries value in the specified visual. For  DirectColor , the effect is as if an  XAllocColorPlanes  call returned a pixel value of zero and red_mask, green_mask, and blue_mask values containing the same bits as the corresponding masks in the specified visual. However, in all cases, none of these entries can be freed by using  XFreeColors .  XCreateColormap  can generate  BadAlloc ,  BadMatch ,  BadValue , and  BadWindow  errors. The  XCopyColormapAndFree  function creates a colormap of the same visual type and for the same screen as the specified colormap and returns the new colormap ID. It also moves all of the client's existing allocation from the specified colormap to the new colormap with their color values intact and their read-only or writable characteristics intact and frees those entries in the specified colormap. Color values in other entries in the new colormap are undefined. If the specified colormap was created by the client with alloc set to  AllocAll , the new colormap is also created with  AllocAll , all color values for all entries are copied from the specified colormap, and then all entries in the specified colormap are freed. If the specified colormap was not created by the client with  AllocAll , the allocations to be moved are all those pixels and planes that have been allocated by the client using  XAllocColor ,  XAllocNamedColor ,  XAllocColorCells , or  XAllocColorPlanes  and that have not been freed since they were allocated.  XCopyColormapAndFree  can generate  BadAlloc  and  BadColor  errors. The  XFreeColormap  function deletes the association between the colormap resource ID and the colormap and frees the colormap storage. However, this function has no effect on the default colormap for a screen. If the specified colormap is an installed map for a screen, it is uninstalled (see  XUninstallColormap ). If the specified colormap is defined as the colormap for a window (by  XCreateWindow ,  XSetWindowColormap , or  XChangeWindowAttributes ),  XFreeColormap  changes the colormap associated with the window to  None  and generates a  ColormapNotify  event. X does not define the colors displayed for a window with a colormap of  None .  XFreeColormap  can generate a  BadColor  error. The  XColor  structure contains: typedef struct { unsigned long pixel; /∗ pixel value */ unsigned short red, green, blue; /∗ rgb values */ char flags; /∗ DoRed, DoGreen, DoBlue */ char pad; } XColor; The red, green, and blue values are always in the range 0 to 65535 inclusive, independent of the number of bits actually used in the display hardware. The server scales these values down to the range used by the hardware. Black is represented by (0,0,0), and white is represented by (65535,65535,65535). In some functions, the flags member controls which of the red, green, and blue members is used and can be the inclusive OR of zero or more of  DoRed ,  DoGreen , and  DoBlue .  BadAlloc  The server failed to allocate the requested resource or server memory.  BadColor  A value for a Colormap argument does not name a defined Colormap.  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.  BadWindow  A value for a Window argument does not name a defined Window. XAllocColor(3X11), XChangeWindowAttributes(3X11), XCreateWindow(3X11), XQueryColor(3X11), XStoreColors(3X11) Xlib - C Language X Interface