Linux Manuals session 3

XTextExtents, XTextExtents16, XQueryTextExtents, XQueryTextExtents16 – compute or query text extents Syntaxint XTextExtents(XFontStruct *font_struct, char *string, int nchars, int *direction_return, int *font_ascent_return, int *font_descent_return, XCharStruct *overall_return); int XTextExtents16(XFontStruct *font_struct, XChar2b *string, int nchars, int *direction_return, int *font_ascent_return, int *font_descent_return, XCharStruct *overall_return); int XQueryTextExtents(Display *display, XID font_ID, char *string, int nchars, int *direction_return, int *font_ascent_return, int *font_descent_return,…

XTextExtents, XTextExtents16, XQueryTextExtents, XQueryTextExtents16 – compute or query text extents Syntaxint XTextExtents(XFontStruct *font_struct, char *string, int nchars, int *direction_return, int *font_ascent_return, int *font_descent_return, XCharStruct *overall_return); int XTextExtents16(XFontStruct *font_struct, XChar2b *string, int nchars, int *direction_return, int *font_ascent_return, int *font_descent_return, XCharStruct *overall_return); int XQueryTextExtents(Display *display, XID font_ID, char *string, int nchars, int *direction_return, int *font_ascent_return, int *font_descent_return,…

XQueryPointer – get pointer coordinates SyntaxBool XQueryPointer(Display *display, Window w, Window *root_return, Window *child_return, int *root_x_return, int *root_y_return, int *win_x_return, int *win_y_return, unsigned int *mask_return);Argumentschild_return Returns the child window that the pointer is located in, if any. display Specifies the connection to the X server. mask_return Returns the current state of the modifier keys and…

XChangeKeyboardControl, XGetKeyboardControl, XAutoRepeatOn, XAutoRepeatOff, XBell, XQueryKeymap, XKeyboardControl – manipulate keyboard settings and keyboard control structure Syntaxint XChangeKeyboardControl(Display *display, unsigned long value_mask, XKeyboardControl *values); int XGetKeyboardControl(Display *display, XKeyboardState *values_return); int XAutoRepeatOn(Display *display); int XAutoRepeatOff(Display *display); int XBell(Display *display, int percent); int XQueryKeymap(Display *display, char keys_return[32]);Argumentsdisplay Specifies the connection to the X server. keys_return Returns an array…

XLoadFont, XQueryFont, XLoadQueryFont, XFreeFont, XGetFontProperty, XUnloadFont, XCharStruct, XFontProp, XChar2b, XFontStruct – load or unload fonts and font metric structures SyntaxFont XLoadFont(Display *display, char *name); XFontStruct *XQueryFont(Display *display, XID font_ID); XFontStruct *XLoadQueryFont(Display *display, char *name); int XFreeFont(Display *display, XFontStruct *font_struct); Bool XGetFontProperty(XFontStruct *font_struct, Atom atom, unsigned long *value_return); int XUnloadFont(Display *display, Font font);Argumentsatom Specifies the atom…

XQueryExtension, XListExtensions, XFreeExtensionList – list available extensions SyntaxBool XQueryExtension(display, name, major_opcode_return, first_event_return, first_error_return) char **XListExtensions(display, nextensions_return) XFreeExtensionList(list)Argumentsdisplay Specifies the connection to the X server. name Specifies the extension name. major_opcode_return Returns the major opcode. first_event_return Returns the first event code, if any. first_error_return Returns the first error code, if any. nextensions_return Returns the number of…

XQueryDeviceState – query the state of an extension input device. Synopsis#include <X11/extensions/XInput.h>XDeviceState* XQueryDeviceState( Display *display, XDevice *device);display Specifies the connection to the X server.device Specifies the device whose state is to be queried.DescriptionThe XQueryDeviceState request queries the state of an input device. The current state of keys and buttons (up or down), and valuators (current…

XQueryColor, XQueryColors, XLookupColor, XParseColor – obtain color values Syntaxint XQueryColor(Display *display, Colormap colormap, XColor *def_in_out); int XQueryColors(Display *display, Colormap colormap, XColor defs_in_out[], int ncolors); Status XLookupColor(Display *display, Colormap colormap, char *color_name, XColor *exact_def_return, XColor *screen_def_return); Status XParseColor(Display *display, Colormap colormap, char *spec, XColor *exact_def_return);Argumentscolormap Specifies the colormap. color_name Specifies the color name string (for example,…

XQueryColor, XQueryColors, XLookupColor, XParseColor – obtain color values Syntaxint XQueryColor(Display *display, Colormap colormap, XColor *def_in_out); int XQueryColors(Display *display, Colormap colormap, XColor defs_in_out[], int ncolors); Status XLookupColor(Display *display, Colormap colormap, char *color_name, XColor *exact_def_return, XColor *screen_def_return); Status XParseColor(Display *display, Colormap colormap, char *spec, XColor *exact_def_return);Argumentscolormap Specifies the colormap. color_name Specifies the color name string (for example,…

XQueryBestSize, XQueryBestTile, XQueryBestStipple – determine efficient sizes SyntaxStatus XQueryBestSize(Display *display, int class, Drawable which_screen, unsigned int width, unsigned int height, unsigned int *width_return, unsigned int *height_return); Status XQueryBestTile(Display *display, Drawable which_screen, unsigned int width, unsigned int height, unsigned int *width_return, unsigned int *height_return); Status XQueryBestStipple(Display *display, Drawable which_screen, unsigned int width, unsigned int height, unsigned…

XQueryBestSize, XQueryBestTile, XQueryBestStipple – determine efficient sizes SyntaxStatus XQueryBestSize(Display *display, int class, Drawable which_screen, unsigned int width, unsigned int height, unsigned int *width_return, unsigned int *height_return); Status XQueryBestTile(Display *display, Drawable which_screen, unsigned int width, unsigned int height, unsigned int *width_return, unsigned int *height_return); Status XQueryBestStipple(Display *display, Drawable which_screen, unsigned int width, unsigned int height, unsigned…

XQueryBestSize, XQueryBestTile, XQueryBestStipple – determine efficient sizes SyntaxStatus XQueryBestSize(Display *display, int class, Drawable which_screen, unsigned int width, unsigned int height, unsigned int *width_return, unsigned int *height_return); Status XQueryBestTile(Display *display, Drawable which_screen, unsigned int width, unsigned int height, unsigned int *width_return, unsigned int *height_return); Status XQueryBestStipple(Display *display, Drawable which_screen, unsigned int width, unsigned int height, unsigned…

XRecolorCursor, XFreeCursor, XQueryBestCursor – manipulate cursors Syntaxint XRecolorCursor(Display *display, Cursor cursor, XColor *foreground_color, XColor *background_color); int XFreeCursor(Display *display, Cursor cursor); Status XQueryBestCursor(Display *display, Drawable d, unsigned int width, unsigned int height, unsigned int *width_return, unsigned int *height_return);Argumentsbackground_color Specifies the RGB values for the background of the source. cursor Specifies the cursor. d Specifies the drawable,…

XInitImage, XCreateImage, XGetPixel, XPutPixel, XSubImage, XAddPixel, XDestroyImage – image utilities SyntaxStatus XInitImage(XImage *image); XImage *XCreateImage(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 *ximage, int x, int y); int XPutPixel(XImage *ximage, int x, int y, unsigned long pixel);…

XPutImage, XGetImage, XGetSubImage – transfer images Syntaxint 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…

XPutBackEvent – put events back on the queue SyntaxXPutBackEvent(Display *display, XEvent *event);Argumentsdisplay Specifies the connection to the X server. event Specifies the event.DescriptionThe XPutBackEvent function pushes an event back onto the head of the display’s event queue by copying the event into the queue. This can be useful if you read an event and then…

XPropertyEvent – PropertyNotify event structure StructuresThe structure for PropertyNotify events contains: typedef struct {         int type;       /* PropertyNotify */         unsigned long serial;   /* # of last request processed by server */         Bool send_event;        /* true if this came from a SendEvent request */         Display *display;       /* Display the event was read from */         Window window;         Atom atom;         Time time;         int state;      /* PropertyNewValue or PropertyDelete */ } XPropertyEvent; When you receive this…

XAddConnectionWatch, XRemoveConnectionWatch, XProcessInternalConnection, XInternalConnectionNumbers – handle Xlib internal connections Syntaxtypedef void (*XConnectionWatchProc)(Display *display, XPointer client_data, int fd, Bool opening, XPointer *watch_data); Status XAddConnectionWatch(Display *display, XWatchProc procedure, XPointer client_data); Status XRemoveConnectionWatch(Display *display, XWatchProc procedure, XPointer client_data); void XProcessInternalConnection(Display *display, int fd); Status XInternalConnectionNumbers(Display *display, int **fd_return, int *count_return);Argumentsclient_data Specifies the additional client data. count_return Returns the…

XPolygonRegion, XClipBox – generate regions SyntaxRegion XPolygonRegion(XPoint points[], int n, int fill_rule); int XClipBox(Region r, XRectangle *rect_return);Argumentsfill_rule Specifies the fill-rule you want to set for the specified GC. You can pass EvenOddRule or WindingRule. n Specifies the number of points in the polygon. points Specifies an array of points. r Specifies the region. rect_return Returns…

XEmptyRegion, XEqualRegion, XPointInRegion, XRectInRegion – determine if regions are empty or equal SyntaxBool XEmptyRegion(Region r); Bool XEqualRegion(Region r1, Region r2); Bool XPointInRegion(Region r, int x, int y); int XRectInRegion(Region r, int x, int y, unsigned int width, unsigned int height);Argumentsr Specifies the region. r1 r2 Specify the two regions. width height Specify the width and…