nanogui: Thread: Can't rotate built-in font

Hello,
I'm using ADS strongarm and all is working fine until now.

I can print a built-in font no problem but after
GrSetFontRotation(valid_font_id , 150);
still no rotation. No errors returned. Anyone with a hint? Thanks
bv

> I can print a built-in font no problem but after
> GrSetFontRotation(valid_font_id , 150);
> still no rotation. No errors returned. Anyone with a hint? Thanks

Yes - there's no code in the built-in font subrenderer for rotating
font bitmaps.  This has only been implemented for the truetype
renderer, you might take a look at that implementation to give
you some ideas.  It uses some internal freetype lib routines
to help, IIRC.

Regards,

Greg

How much space and proformance does using true type fonts take?

Greg Haerr wrote:

>>I can print a built-in font no problem but after
>>GrSetFontRotation(valid_font_id , 150);
>>still no rotation. No errors returned. Anyone with a hint? Thanks
>>    
>>
>
>Yes - there's no code in the built-in font subrenderer for rotating
>font bitmaps.  This has only been implemented for the truetype
>renderer, you might take a look at that implementation to give
>you some ideas.  It uses some internal freetype lib routines
>to help, IIRC.
>
>Regards,
>
>Greg
>
>
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My application is a "real-time" chart plotter so I will be adding font
rotation.
I use the linux font editor to build cool instrumentation fonts and then
compile into nano-X.
bv

> How much space and proformance does using true type fonts take?

Truetype fonts are quite a bit more expensive to render 
than built-in or loaded pcf fonts, since the bitmap needs
to be computed from the vectors/hints for each character.
Some of this may not be cached as well.

Regards,

Greg

> My application is a "real-time" chart plotter so I will be adding font
> rotation.

That would be great...  check out the transformation function
in font_freetype.c.  That code computes the baseline x,y
location for a string, the trickier part, handled in the freetype
lib, is building differently-sized bitmaps based on the rotation
angle.  This won't be the same as the original char bitmap size.

Regards,

Greg