Xlib â C Language X Interface

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Xlib − C LibraryX11, Release 6.7 DRAFTThe max_logical_extent member gives the maximum extent, over all drawable characters, of therectangles that specify minimum spacing to other graphical features, relative to aconstant origin.Other graphical features drawn by the client, for example, a border surrounding the text, shouldnot intersect this rectangle. The max_logical_extent member should be used to compute minimuminterline spacing and the minimum area that must be allowed in a text field to draw agivennumber of arbitrary characters.Due to context-dependent rendering, appending a given character to a string may change thestring’s extent by an amount other than that character’s individual extent.The rectangles for a given character in a string can be obtained from XmbPerCharExtents,XwcPerCharExtents or Xutf8PerCharExtents.To obtain the maximum extents structure given an XFontSet, use XExtentsOfFontSet.XFontSetExtents *XExtentsOfFontSet (font_set)XFontSet font_set;font_setSpecifies the font set.The XExtentsOfFontSet function returns an XFontSetExtents structure for the fonts used bythe Xmb/wc/utf8 layer for the given font set.The XFontSetExtents structure is owned by Xlib and should not be modified or freed by theclient. It will be freed by a call to XFreeFontSet with the associated XFontSet. Until freed, itscontents will not be modified by Xlib.To obtain the escapement in pixels of the specified text as a value, use XmbTextEscapement,XwcTextEscapement or Xutf8TextEscapement.int XmbTextEscapement (font_set, string, num_bytes)XFontSet font_set;char *string;int num_bytes;int XwcTextEscapement (font_set, string, num_wchars)XFontSet font_set;wchar_t *string;int num_wchars;int Xutf8TextEscapement (font_set, string, num_bytes)XFontSet font_set;char *string;int num_bytes;font_setstringnum_bytesnum_wcharsSpecifies the font set.Specifies the character string.Specifies the number of bytes in the string argument.Specifies the number of characters in the string argument.The XmbTextEscapement, XwcTextEscapement and Xutf8TextEscapement functions return293
Xlib − C LibraryX11, Release 6.7 DRAFTthe escapement in pixels of the specified string as a value, using the fonts loaded for the specifiedfont set. The escapement is the distance in pixels in the primary draw direction from the drawingorigin to the origin of the next character to be drawn, assuming that the rendering of the nextcharacter is not dependent on the supplied string.Regardless of the character rendering order, the escapement is always positive.The function Xutf8TextEscapement is an XFree86 extension introduced in XFree86 4.0.2. Itspresence is indicated by the macro X_HAVE_UTF8_STRING.To obtain the overall_ink_return and overall_logical_return arguments, the overall bounding boxof the string’s image, and a logical bounding box, use XmbTextExtents, XwcTextExtents orXutf8TextExtents.int XmbTextExtents (font_set, string, num_bytes, overall_ink_return, overall_logical_return)XFontSet font_set;char *string;int num_bytes;XRectangle *overall_ink_return;XRectangle *overall_logical_return;int XwcTextExtents (font_set, string, num_wchars,overall_ink_return, overall_logical_return)XFontSet font_set;wchar_t *string;int num_wchars;XRectangle *overall_ink_return;XRectangle *overall_logical_return;int Xutf8TextExtents (font_set, string, num_bytes, overall_ink_return, overall_logical_return)XFontSet font_set;char *string;int num_bytes;XRectangle *overall_ink_return;XRectangle *overall_logical_return;font_setstringnum_bytesnum_wcharsSpecifies the font set.Specifies the character string.Specifies the number of bytes in the string argument.Specifies the number of characters in the string argument.overall_ink_returnReturns the overall ink dimensions.overall_logical_returnReturns the overall logical dimensions.The XmbTextExtents, XwcTextExtents and Xutf8TextExtents functions set the componentsof the specified overall_ink_return and overall_logical_return arguments to the overall boundingbox of the string’s image and a logical bounding box for spacing purposes, respectively. Theyreturn the value returned by XmbTextEscapement, XwcTextEscapement or Xutf8TextEscapement.These metrics are relative to the drawing origin of the string, using the fonts loaded for thespecified font set.294
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AcknowledgmentsThe design and imple
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Release 6Stephen Gildea (X Consorti
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Xlib − C LibraryX11, Release 6.7
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4.2. Translating Screen Coordinates
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10.7. Input Focus Events . . . . .
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13.5.6.1. Input Style . . . . . . .
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