XDrawText16(3)


NAME

   XDrawText, XDrawText16, XTextItem, XTextItem16 - draw polytext text and
   text drawing structures

SYNTAX

   int XDrawText(Display *display, Drawable d, GC gc, int x, int y,
          XTextItem *items, int nitems);

   int XDrawText16(Display *display, Drawable d, GC gc, int x, int y,
          XTextItem16 *items, int nitems);

ARGUMENTS

   d         Specifies the drawable.

   display   Specifies the connection to the X server.

   gc        Specifies the GC.

   items     Specifies an array of text items.

   nitems    Specifies the number of text items in the array.

   x
   y         Specify the x and y coordinates, which are relative to the
             origin of the specified drawable and define the origin of the
             first character.

DESCRIPTION

   The XDrawText16 function is similar to XDrawText except that it uses
   2-byte or 16-bit characters.  Both functions allow complex spacing and
   font shifts between counted strings.

   Each text item is processed in turn.  A font member other than None in
   an item causes the font to be stored in the GC and used for subsequent
   text.  A text element delta specifies an additional change in the
   position along the x axis before the string is drawn.  The delta is
   always added to the character origin and is not dependent on any
   characteristics of the font.  Each character image, as defined by the
   font in the GC, is treated as an additional mask for a fill operation
   on the drawable.  The drawable is modified only where the font
   character has a bit set to 1.  If a text item generates a BadFont
   error, the previous text items may have been drawn.

   For fonts defined with linear indexing rather than 2-byte matrix
   indexing, each XChar2b structure is interpreted as a 16-bit number with
   byte1 as the most significant byte.

   Both functions use these GC components: function, plane-mask, fill-
   style, font, subwindow-mode, clip-x-origin, clip-y-origin, and clip-
   mask.  They also use these GC mode-dependent components: foreground,
   background, tile, stipple, tile-stipple-x-origin, and tile-stipple-y-
   origin.

   XDrawText and XDrawText16 can generate BadDrawable, BadFont, BadGC, and
   BadMatch errors.

STRUCTURES

   The XTextItem and XTextItem16 structures contain:

   typedef struct {
           char *chars;    /* pointer to string */
           int nchars;     /* number of characters */
           int delta;      /* delta between strings */
           Font font;      /* Font to print it in, None don't change */
   } XTextItem;

   typedef struct {
           XChar2b *chars; /* pointer to two-byte characters */
           int nchars;     /* number of characters */
           int delta;      /* delta between strings */
           Font font;      /* font to print it in, None don't change */
   } XTextItem16;

   If the font member is not None, the font is changed before printing and
   also is stored in the GC.  If an error was generated during text
   drawing, the previous items may have been drawn.  The baseline of the
   characters are drawn starting at the x and y coordinates that you pass
   in the text drawing functions.

   For example, consider the background rectangle drawn by
   XDrawImageString.  If you want the upper-left corner of the background
   rectangle to be at pixel coordinate (x,y), pass the (x,y + ascent) as
   the baseline origin coordinates to the text functions.  The ascent is
   the font ascent, as given in the XFontStruct structure.  If you want
   the lower-left corner of the background rectangle to be at pixel
   coordinate (x,y), pass the (x,y - descent + 1) as the baseline origin
   coordinates to the text functions.  The descent is the font descent, as
   given in the XFontStruct structure.

DIAGNOSTICS

   BadDrawable
             A value for a Drawable argument does not name a defined
             Window or Pixmap.

   BadFont   A value for a Font or GContext argument does not name a
             defined Font.

   BadGC     A value for a GContext argument does not name a defined
             GContext.

   BadMatch  An InputOnly window is used as a Drawable.

SEE ALSO

   XDrawImageString(3), XDrawString(3), XLoadFont(3)
   Xlib - C Language X Interface





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