Re: [ft] advance X value is less than width

[samaram s]

It's hard to tell without more information.  What font, at which ppem
size?  How does your font look like with, say, ftdiff or ftview?
Here are the Details:
FONT_NAME     =    Arial
FONT_STYLE     =    Regular
FONT_HEIGHT     =    12

For 0x76: i get bitmap data as,

BitmapData: 41,00,41,00,22,00,22,00,14,00,14,00,14,00,08,00,08,00
09- Width, [ bbox.xMax - bbox.xMin ]
09-height, [ bbox.yMax - bbox.yMin ]
07-AdvanceX [slot->advance.x>>6]

Here is the calculation to generate bitmap data,
totalsize = slot->bitmap.rows * abs(slot->bitmap.pitch);
bytes_read = ((slot->bitmap.width)+7)/8;
actual_size = slot->bitmap.rows *bytes_read;

for( n=0; n < totalsize; n++)
    {
        //reading last byte of data so no need for comma
        if( j == actual_size-1)
            sprintf((buffer+j*3),"%02x",(char*) slot->bitmap.buffer[n] );
        else
            sprintf((buffer+j*3),"%02x,",(char*) slot->bitmap.buffer[n] );

        j++;
        i++;
        if(i == bytes_read)
        {
            n = n + ( abs(slot->bitmap.pitch) - bytes_read);
            i = 0;
            continue;
        }
    }

i just used freetype to generate bitmap data, I observed the data calculation.font height,width is correct. But observed AdvanceX coming lesser than Width of the Glyph for few characters.(say may be 10 glyphs in 00-FFFF).

Thanks.

On Sat, Oct 23, 2010 at 3:57 AM, Werner LEMBERG <address@hidden> wrote:

> I observed advance x value is less than width of the char for
> y,w,v(lower case).
>
> Width i am calculating : Width as :(bbox.xMax - bbox.xMin)
>                                     AdvanceX as: slot->advance.x>>6
> For glyph v:
>  Width = 0x09
> AdvanceX = 0x08
>

> Any guess? Am i doing anything wrong? For remaining all other glyphs
> it is coming correct.

It's hard to tell without more information.  What font, at which ppem
size?  How does your font look like with, say, ftdiff or ftview?


   Werner