Where is the documentation for the X rendering extension library?

Portal · 03-08-2020, 02:10 PM

I am currently studying the source code of dwm. DWM uses a function XftTextExtents, which modifies a XGlyphInfo struct. Man xft(3) gives that this XGlyphInfo struct is defined in the X rendering extension library, but nowhere can I find the source code/documentaiton of this library. Where can I find the struct declarations of XGlyphInfo?

BW-userx · 03-08-2020, 02:17 PM

select right click google "XGlyphInfo" got this
https://www.x.org/releases/X11R7.5/d...libXrender.txt
http://hackage.haskell.org/package/X...1-Xrender.html
https://osnacs.github.io/plantex/x11...GlyphInfo.html
and a bunch more... easy pesy

Portal · 03-08-2020, 02:21 PM

Quote:

Originally Posted by BW-userx

select right click google "XGlyphInfo" got this
https://www.x.org/releases/X11R7.5/d...libXrender.txt
http://hackage.haskell.org/package/X...1-Xrender.html
https://osnacs.github.io/plantex/x11...GlyphInfo.html
and a bunch more... easy pesy

Do you happen to know what the xOff attribute of the struct is?

BW-userx · 03-08-2020, 02:32 PM

it is in the link.
btw I have no idea about anything. I googled this remember. you might be surprised at how much information is out there if you search for it first. just saying...

Code:

typedef struct _XGlyphInfo {
	    unsigned short  width;
	    unsigned short  height;
	    short	    x;
	    short	    y;
	    short	    xOff; <---- 
	    short	    yOff;
	} XGlyphInfo;

https://refspecs.linuxbase.org/LSB_4...der-ddefs.html

Portal · 03-08-2020, 02:36 PM

Quote:

Originally Posted by BW-userx

it is in the link.
btw I have no idea about anything. I googled this remember. you might be surprised at how much information is out there if you search for it first. just saying...

Code:

typedef struct _XGlyphInfo {
	    unsigned short  width;
	    unsigned short  height;
	    short	    x;
	    short	    y;
	    short	    xOff; <---- 
	    short	    yOff;
	} XGlyphInfo;

https://refspecs.linuxbase.org/LSB_4...der-ddefs.html

yea...I've looked at these links before, but they never really explained what the xOff/yOff attributes really are... thanks for the help anyway.

dugan · 03-08-2020, 03:15 PM

Seems fairly obvious to me that they're offsets.

Portal · 03-08-2020, 03:18 PM

Quote:

Originally Posted by dugan

Seems fairly obvious to me that they're offsets.

offsets to what...? I also don’t recall the concept of offsets being used in glyph metrics

SoftSprocket · 03-08-2020, 03:24 PM

Quote:

Originally Posted by Portal

yea...I've looked at these links before, but they never really explained what the xOff/yOff attributes really are... thanks for the help anyway.

I think (but don't know) that they are used for width (xOff) and height (yOff) in some manner. This is based on how I've seem them being used - not on something documented.

dugan · 03-08-2020, 06:13 PM

Found a couple links that haven't been posted yet. This, in particular, seems to have an answer:

Quote:

xOff, yOff is the normal spacing to the next glyph.

https://seesaawiki.jp/w/smnb/d/X%20W...#content_4_4_7

Googling for that phrase got me this, which actually expands on it quite a bit:

https://bugzilla.mozilla.org/show_bug.cgi?id=128153#c25

There's also this:

https://keithp.com/pipermail/fontcon...ch/000125.html

Portal · 03-08-2020, 10:43 PM

Quote:

Originally Posted by dugan

Found a couple links that haven't been posted yet. This, in particular, seems to have an answer:

https://seesaawiki.jp/w/smnb/d/X%20W...#content_4_4_7

Googling for that phrase got me this, which actually expands on it quite a bit:

https://bugzilla.mozilla.org/show_bug.cgi?id=128153#c25

There's also this:

https://keithp.com/pipermail/fontcon...ch/000125.html

Thank you for the finds. The links are helpful.