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.\" Copyright (C) 2001 Information-technology Promotion Agency (IPA)
.\" Copyright (C) 2001-2011
.\" National Institute of Advanced Industrial Science and Technology (AIST)
.\" This file is part of the m17n library documentation.
.\" Permission is granted to copy, distribute and/or modify this document
.\" under the terms of the GNU Free Documentation License, Version 1.2 or
.\" any later version published by the Free Software Foundation; with no
.\" Invariant Section, no Front-Cover Texts,
.\" and no Back-Cover Texts. A copy of the license is included in the
.\" appendix entitled "GNU Free Documentation License".
.TH "mdraw_text" 3m17n "12 Jan 2011" "Version 1.6.2" "The m17n Library" \" -*- nroff -*-
.ad l
.nh
.SH NAME
mdraw_text \- Draw an M\-text on a window.
.SH SYNOPSIS
int
\fBmdraw_text\fP (\fBMFrame\fP *
\fIframe\fP, \fBMDrawWindow\fP
\fIwin\fP, int
\fIx\fP, int
\fIy\fP, \fBMText\fP *
\fImt\fP, int
\fIfrom\fP, int
\fIto\fP)
.SH DESCRIPTION
Draw an M\-text on a window. The
.ft B
mdraw_text()
.ft R
function draws the text between
.ft B
from
.ft R
and
.ft B
to
.ft R
of M\-text
.ft B
mt
.ft R
on window
.ft B
win
.ft R
of frame
.ft B
frame
.ft R
at coordinate (\fBx\fP,
.ft R
.ft B
y\fP).
.PP
The appearance of the text (size, style, color, etc) is specified by the value of the text property whose key is
.ft C
Mface\fP.
.ft R
If the M\-text or a part of the M\-text does not have such a text property, the default face of
.ft B
frame
.ft R
is used.
.PP
The font used to draw a character in the M\-text is selected from the value of the fontset property of a face by the following algorithm:
.PP
.PD 0
.IP "1." 4
Search the text properties given to the character for the one whose key is
.ft C
Mcharset\fP;
.ft R
its value should be either a symbol specifying a charset or
.ft B
Mnil\fP.
.ft R
If the value is
.ft B
Mnil\fP,
.ft R
proceed to the next step.
.PP
Otherwise, search the mapping table of the fontset for the charset. If no entry is found proceed to the next step.
.PP
If an entry is found, use one of the fonts in the entry that has a glyph for the character and that matches best with the face properties. If no such font exists, proceed to the next step.
.PP
.IP "2." 4
Get the character property 'script' of the character. If it is inherited, get the script property from the previous characters. If there is no previous character, or none of them has the script property other than inherited, proceed to the next step.
.PP
Search the text properties given to the character for the one whose key is
.ft C
Mlanguage\fP;
.ft R
its value should be either a symbol specifying a language or
.ft C
Mnil\fP.
.ft R
.PP
Search the mapping table of the fontset for the combination of the script and language. If no entry is found, proceed to the next step.
.PP
If an entry is found, use one of the fonts in the entry that has a glyph for the character and that matches best with the face properties. If no such font exists, proceed to the next step.
.PP
.IP "3." 4
Search the fall\-back table of the fontset for a font that has a glyph of the character. If such a font is found, use that font.
.PP
.PP
.PP
If no font is found by the algorithm above, this function draws an empty box for the character.
.PP
This function draws only the glyph foreground. To specify the background color, use
.ft B
mdraw_image_text()
.ft R
or
.ft B
mdraw_text_with_control()\fP.
.ft R
.PP
This function is the counterpart of
.ft C
XDrawString()\fP,
.ft R
.ft C
XmbDrawString()\fP,
.ft R
and
.ft C
XwcDrawString()
.ft R
functions in the X Window System.
.PP
.SH RETURN VALUE
.PP
.RS 4
If the operation was successful,
.ft B
mdraw_text()
.ft R
returns 0. If an error is detected, it returns \-1 and assigns an error code to the external variable
.ft B
merror_code\fP.
.ft R
.RE
.PP
.SH ERRORS
.PP
.RS 4
\fCMERROR_RANGE
.ft R
.RE
.PP
.SH "SEE ALSO"
.PP
.RS 4
\fBmdraw_image_text()
.ft R
.RE
.PP
.SH COPYRIGHT
Copyright (C) 2001 Information\-technology Promotion Agency (IPA)
.br
Copyright (C) 2001\-2011 National Institute of Advanced Industrial Science and Technology (AIST)
.br
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License
<http://www.gnu.org/licenses/fdl.html>.
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