Re: freetype module sometimes gets font height (descent?) wrong

From: Michael Lampe <[email protected]>
Subject: [Fonts] freetype module sometimes gets font height (descent?) wrong
Date: Fri, 20 Feb 2004 17:39:58 +0100

> xlsfonts lists the font in question.
> 
> Emacs bluntly says "No fonts match ..." and aborts.
> 
> xfd seems to use it, but displays "unknown font" in the first line. And 
> contrary to what I said before you can see the overall problem with xfd 
> too if you increase the font size.

  OK. That patch was broken.  I somewhat misunderstood...

> I'm still wondering if you are able to reproduce what I'm talking about. 
>   Please try
> 
> xedit
>   -fn "-monotype-courier new-medium-r-normal--12-0-100-100-m-0-iso8859-1"
> 
> Two small images of what it looks like for me are here:
> 
> http://cox.iwr.uni-heidelberg.de/~lampe/xedit-xtt.png
> http://cox.iwr.uni-heidelberg.de/~lampe/xedit-freetype.png

  I cannot reprodeuce them using xedit... Why?   How is your 
"resolution" of xdpyinfo.  100x100 dots per inch?

  I attach "fontpropdump.c".  Would you tell me the results of
"freetype" and "xtt"?

  usage:

  ./fontpropdump "-monotype-courier new-medium-r-normal--12-0-100-100-m-0-iso8859-1"

  Here are my results:

[X-TT]
PIXEL_SIZE : 12
POINT_SIZE : 87
RESOLUTION_X : 100
RESOLUTION_Y : 100
AVERAGE_WIDTH : 70
RAW_AVERAGE_WIDTH : 6001
FONT_ASCENT : 11
RAW_ASCENT : (none)
FONT_DESCENT : 4
RAW_DESCENT : (none)
SUBSCRIPT_SIZE : 8
SUBSCRIPT_X : 0
SUBSCRIPT_Y : 2
SUPERSCRIPT_SIZE : 8
SUPERSCRIPT_X : 0
SUPERSCRIPT_Y : 5
UNDERLINE_THICKNESS : 1
UNDERLINE_POSITION : 3
RAW_PIXEL_SIZE : (none)
RAW_POINT_SIZE : (none)

[FreeType]
PIXEL_SIZE : 12
POINT_SIZE : 87
RESOLUTION_X : 100
RESOLUTION_Y : 100
AVERAGE_WIDTH : 70
RAW_AVERAGE_WIDTH : 600
FONT_ASCENT : (none)
RAW_ASCENT : 832
FONT_DESCENT : (none)
RAW_DESCENT : 300
SUBSCRIPT_SIZE : (none)
SUBSCRIPT_X : (none)
SUBSCRIPT_Y : (none)
SUPERSCRIPT_SIZE : (none)
SUPERSCRIPT_X : (none)
SUPERSCRIPT_Y : (none)
UNDERLINE_THICKNESS : (none)
UNDERLINE_POSITION : (none)
RAW_PIXEL_SIZE : 1000
RAW_POINT_SIZE : 723

  The resolution of Xserver is 100x100 dots per inch.

------------------------------------------------------------
    Chisato Yamauchi

#include <stdio.h>
#include <X11/Xlib.h>

int main( int argc, char *argv[] )
{
    Display *dis;
    XFontStruct *fs;
    Atom atom;
    unsigned long val;
    char *name;
    Bool result;
    char *props[] = {
	"PIXEL_SIZE",
	"POINT_SIZE",
	"RESOLUTION_X",
	"RESOLUTION_Y",
	"AVERAGE_WIDTH",
	"RAW_AVERAGE_WIDTH",
	"FONT_ASCENT",
	"RAW_ASCENT",
	"FONT_DESCENT",
	"RAW_DESCENT",
	"SUBSCRIPT_SIZE",
	"SUBSCRIPT_X",
	"SUBSCRIPT_Y",
	"SUPERSCRIPT_SIZE",
	"SUPERSCRIPT_X",
	"SUPERSCRIPT_Y",
	"UNDERLINE_THICKNESS",
	"UNDERLINE_POSITION",
	"RAW_PIXEL_SIZE",
	"RAW_POINT_SIZE",
	NULL,
    };
    int i;

    if( argc < 2 ) return -1;
    dis=XOpenDisplay(NULL);
    fs = XLoadQueryFont(dis,argv[1]);
    if( fs==NULL ) return -1;

    i=0;
    while ( props[i] != NULL ) {
	atom = XInternAtom(dis, props[i], True);
	result = XGetFontProperty(fs,atom,&val);
	if ( result )
	    printf("%s : %d\n",props[i],val);
	else
	    printf("%s : (none)\n",props[i]);
	i++;
    }
    return 0;
}