Re: [ft] diff Pixel height

[samaram s]

Thanks Werner.Hats-off for remembering!!

Where can find about definition of hinted fonts?What it means?

How does it vary in freetype for HINT and NO_HINT?


Also,When i was looking for hinted in FT_Load_Glyph i found , For no_hinting we can use FT_LOAD_NO_SCALE flag

I tried using something like below,
FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_HINTING|FT_LOAD_RENDER|FT_LOAD_MONOCHROME);

But still i am getting xmin for A as -1.

If i would like to check no_hinting option,how can i do it?

Thanks,
Sam

On Tue, Feb 16, 2010 at 5:39 PM, Werner LEMBERG <address@hidden> wrote:

Samaram,


I've now found some time to answer this your question:

> I am using Arial.ttf file [at 12px/72dpi], [...] I am getting x min
> for few characters as -1 [after a call to compute the CBox].  Is it
> correct?

Yes.  Have a look at the attached image, from a debugging session with
FontForge.  It shows the outline of glyph `A' from arial.ttf at 12px
with 72dpi, after hinting has been applied.  The hinting engine moves
point 0 to the left so that it eventually gets a negative x value.
After rounding, this becomes -1.  Similarly, point 3 gets moved to the
right, causing the xmax value to be 8.  In other words, the CBox of
the hinted glyph `A' is two pixels wider than necessary.

Always bear in mind the following warning from the description of the
`bbox' field in FT_FaceRec:

 Note that the bounding box might be off by (at least) one pixel for
 hinted fonts.  See @FT_Size_Metrics for further discussion.

In the description of FT_Size_Metrics:

 [...] Indeed, the only way to get the exact metrics is to render
 _all_ glyphs.  As this would be a definite performance hit, it is up
 to client applications to perform such computations.


   Werner

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