I am trying xterm-153 to see how its Xft option works. Mr. Keith Packard
added the support since Patch #148. I want to display Chinese with TrueType
font and anti-aliasing. Since the current Patch #153 only uses
XftDrawString8(), I have to modified it a little bit.
My system:
RedHat 7.0 with freeytype-2.0.1 and XFree86 4.0.3 from rawhide.
simsun.ttf TrueType font.
xterm-153 from ftp://dickey.his.com/xterm/xterm.tar.gz.
The result is marvelous. You have to see it yourself to understand
what I mean.
Since simsun.ttf is a proportional font and contains CJK glyphs, the
max_advance_width is twice as wide as the ascii characters. So I make
the column width (f_width) half of the max_advance_width returned from
Xft (fontutils.c).
In drawXtermText() (util.c), I uses my_wcwidth() to position each glyphs.
I cannot rely on Xft to display the string because the font is proportional.
I know it is not efficient but I think xterm is column based and we can
make use any proportional font this way.
I have noticed one problem with this: characters like U+300A, U+300B and
U+201C, U+201D are single column according to my_wcwidth(), but simsun.ttf
display them as double column. Especially U+300A and U+201C, when it is
displayed, it is overwritten by the character following it.
Another thing is that if the anti-aliased font is displayed reversed (black
background), it looks not as good as black text on white background. This
could have something to do with the gray levels chosen by Xft.
The following is the changes I made:
xterm-153.patch:
==========================================================================
diff -uNr xterm-153.orig/configure xterm-153/configure
--- xterm-153.orig/configure Wed Feb 14 20:29:04 2001
+++ xterm-153/configure Sat Mar 31 01:17:45 2001
@@ -5404,6 +5404,9 @@
#line 5405 "configure"
#include "confdefs.h"
+#include <X11/Xdefs.h>
+#include <X11/Xlib.h>
+
#include <X11/extensions/Xrender.h>
#include <X11/Xft/Xft.h>
int main() {
diff -uNr xterm-153.orig/fontutils.c xterm-153/fontutils.c
--- xterm-153.orig/fontutils.c Wed Jan 24 18:43:31 2001
+++ xterm-153/fontutils.c Sun Apr 1 14:52:03 2001
@@ -890,6 +890,7 @@
if (screen->renderFont)
{
win->f_width = screen->renderFont->max_advance_width;
+ win->f_width /= 2;
win->f_height = screen->renderFont->height;
win->f_ascent = screen->renderFont->ascent;
win->f_descent = screen->renderFont->descent;
diff -uNr xterm-153.orig/util.c xterm-153/util.c
--- xterm-153.orig/util.c Mon Mar 12 20:12:13 2001
+++ xterm-153/util.c Sun Apr 1 14:55:50 2001
@@ -1438,12 +1438,31 @@
int real_length = len;
int draw_len;
+#if OPT_WIDE_CHARS
+ /*
+ * It's simpler to pass in a null pointer for text2 in places where
+ * we only use codes through 255. Fix text2 here so we can increment
+ * it, etc.
+ */
+ if (text2 == 0) {
+ static Char *dbuf;
+ static unsigned dlen;
+ if (dlen <= len) {
+ dlen = (len + 1) * 2;
+ dbuf = (Char *)XtRealloc((char *)dbuf, dlen);
+ memset(dbuf, 0, dlen);
+ }
+ text2 = dbuf;
+ }
+#endif
#ifdef XRENDERFONT
if (screen->renderFont)
{
Display *dpy = screen->display;
XftFont *font;
XGCValues values;
+ int i;
+ int xd;
if (!screen->renderDraw)
{
@@ -1467,30 +1486,36 @@
len * FontWidth(screen), FontHeight(screen));
y += font->ascent;
+#if OPT_WIDE_CHARS
+ xd = 0;
+ for (i = 0; i < len; i++) {
+ XftChar16 c16;
+ int cs;
+
+ c16 = (text2[i]<<8) | text[i];
+ cs = my_wcwidth(c16);
+ if (cs > 0) {
+ XftDrawString16 (screen->renderDraw,
+ getColor (values.foreground),
+ font,
+ x+xd, y, &c16, 1);
+ if (cs == 1) {
+ xd += cs * FontWidth(screen);
+ } else {
+ xd += cs * FontWidth(screen)/2;
+ }
+ }
+ }
+#else
XftDrawString8 (screen->renderDraw,
getColor (values.foreground),
font,
x, y, (unsigned char *) text, len);
+ xd = len * FontWidth(screen);
+#endif
- return x + len * FontWidth(screen);
+ return x + xd;
}
-#endif
-#if OPT_WIDE_CHARS
- /*
- * It's simpler to pass in a null pointer for text2 in places where
- * we only use codes through 255. Fix text2 here so we can increment
- * it, etc.
- */
- if (text2 == 0) {
- static Char *dbuf;
- static unsigned dlen;
- if (dlen <= len) {
- dlen = (len + 1) * 2;
- dbuf = (Char *)XtRealloc((char *)dbuf, dlen);
- memset(dbuf, 0, dlen);
- }
- text2 = dbuf;
- }
#endif
#if OPT_DEC_CHRSET
if (CSET_DOUBLE(chrset)) {
-
Linux-UTF8: i18n of Linux on all levels
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