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[pshinter] Clamp BlueScale value.

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This is Savannah bug #37856.

* src/pshinter/pshglob.c (psh_calc_max_height): New function.
(psh_globals_new): Use it to limit BlueScale value to
`1 / max_of_blue_zone_heights'.
This commit is contained in:
John Tytgat 2012-12-05 11:14:41 +01:00 committed by Werner Lemberg
parent 4d3a1e6c96
commit 54d43a39c5
2 changed files with 59 additions and 2 deletions
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10
ChangeLog
View File

@ -1,3 +1,13 @@
2012-12-03 John Tytgat <John.Tytgat@esko.com>
[pshinter] Clamp BlueScale value.
This is Savannah bug #37856.
* src/pshinter/pshglob.c (psh_calc_max_height): New function.
(psh_globals_new): Use it to limit BlueScale value to
`1 / max_of_blue_zone_heights'.
2012-12-01 Alexei Podtelezhnikov <apodtele@gmail.com>
[truetype, type1] Revise the use of FT_MulDiv.

51
src/pshinter/pshglob.c
View File

@ -5,7 +5,7 @@
/* PostScript hinter global hinting management (body). */
/* Inspired by the new auto-hinter module. */
/* */
/* Copyright 2001, 2002, 2003, 2004, 2006, 2010 by */
/* Copyright 2001-2004, 2006, 2010, 2012 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used */
@ -522,6 +522,28 @@
}
/* calculate the maximum height of given blue zones */
static FT_Short
psh_calc_max_height( FT_UInt num,
const FT_Short* values,
FT_Short cur_max )
{
FT_UInt count;
for ( count = 0; count < num; count += 2 )
{
FT_Short cur_height = values[count + 1] - values[count];
if ( cur_height > cur_max )
cur_max = cur_height;
}
return cur_max;
}
FT_LOCAL_DEF( void )
psh_blues_snap_stem( PSH_Blues blues,
FT_Int stem_top,
@ -684,7 +706,32 @@
priv->family_blues, priv->num_family_other_blues,
priv->family_other_blues, priv->blue_fuzz, 1 );
globals->blues.blue_scale = priv->blue_scale;
/* limit the BlueScale value to `1 / max_of_blue_zone_heights' */
{
FT_Fixed max_scale;
FT_Short max_height = 1;
max_height = psh_calc_max_height( priv->num_blue_values,
priv->blue_values,
max_height );
max_height = psh_calc_max_height( priv->num_other_blues,
priv->other_blues,
max_height );
max_height = psh_calc_max_height( priv->num_family_blues,
priv->family_blues,
max_height );
max_height = psh_calc_max_height( priv->num_family_other_blues,
priv->family_other_blues,
max_height );
/* BlueScale is scaled 1000 times */
max_scale = FT_DivFix( 1000, max_height );
globals->blues.blue_scale = priv->blue_scale < max_scale
? priv->blue_scale
: max_scale;
}
globals->blues.blue_shift = priv->blue_shift;
globals->blues.blue_fuzz = priv->blue_fuzz;