Chapter 13. Examples of I18N

101

13.1.5 Font Preparation (continued)

After calling

XCreateFontSet()

,

GetFont()

builds a few member variables of

MyFont

, i.e.,

font >height

,

font >y

,

font >ascent

, and

font >descent

. These parameters are easily

get from members of

XFontStruct

structure and are actually often used in TWM. Thus I had to

prepare substitutions for

XFontSet

version. These variables also build for

XFontStruct

version

so that a united method can be used to get these parameters.

13.1.6 Drawing Text using

MyFont

To draw a text,

XDrawString()

and

XDrawImageString()

are used for conventional

XFontStruct

.

On the other hand,

XmbDrawString()

/

XwcDrawString()

and

XmbDrawImageString()

/

XwcDrawImageString()

are used for internationalized

XFontSet

. The difference between

mb

and

wc

versions are whether

the text is given in multibyte characters or in wide characters. Since TWM does not perform any text

processing, I didn't use wide characters and treat strings as they are (in multibyte characters).

TWM has many calls of these functions. Thus I decided to write wrappers which checks

use_fontset

and calls proper version of X function. They are

MyFont_DrawString()

and

MyFont_DrawImageString()

.

Thus all calling of

XDrawString()

and

XDrawImageString()

are replaced with the wrappers.

Since these two are almost identical, I will explain one of them.

void

MyFont_DrawString(dpy, d, font, gc, x, y, string, len)

Display *dpy;

Drawable d;

MyFont *font;

GC gc;

int x,y;

char *string;

int len;

{

if (use_fontset) {

XmbDrawString(dpy, d, font >fontset, gc, x, y, string, len);

return;

}

XDrawString (dpy, d, gc, x, y, string, len);

}

Very simple function! However note that the required paramaters are different in these two func 

tions of conventional version and internationalized version. Font is needed for internationalized

version.