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[type1, truetype] Make the MM API more flexible w.r.t. `num_coords'. 

This commit allows `num_coords' to be larger or smaller than the
number of available axes while selecting a design instance, either
ignoring excess data or using defaults if data is missing.

* src/truetype/ttgxvar.c (TT_Set_MM_Blend, TT_Set_Var_Design):
Implement it.

* src/type1/t1load.c (T1_Set_MM_Blend, T1_Set_MM_Design,
T1_Set_Var_Design): Ditto.
This commit is contained in:
Werner Lemberg 2015-03-29 13:32:47 +02:00
parent dd5d6d7a80
commit 10e2bb8b3d
4 changed files with 80 additions and 35 deletions
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16
ChangeLog
View File

@ -1,4 +1,18 @@
2015-03-27 Werner Lemberg <wl@gnu.org>
2015-03-29 Werner Lemberg <wl@gnu.org>
[type1, truetype] Make the MM API more flexible w.r.t. `num_coords'.
This commit allows `num_coords' to be larger or smaller than the
number of available axes while selecting a design instance, either
ignoring excess data or using defaults if data is missing.
* src/truetype/ttgxvar.c (TT_Set_MM_Blend, TT_Set_Var_Design):
Implement it.
* src/type1/t1load.c (T1_Set_MM_Blend, T1_Set_MM_Design,
T1_Set_Var_Design): Ditto.
2015-03-29 Werner Lemberg <wl@gnu.org>
[type1] Minor.

26
include/ftmm.h
View File

@ -95,8 +95,8 @@ FT_BEGIN_HEADER
/* */
/* num_designs :: Number of designs; should be normally 2^num_axis */
/* even though the Type~1 specification strangely */
/* allows for intermediate designs to be present. This */
/* number cannot exceed~16. */
/* allows for intermediate designs to be present. */
/* This number cannot exceed~16. */
/* */
/* axis :: A table of axis descriptors. */
/* */
@ -201,10 +201,10 @@ FT_BEGIN_HEADER
/* associated with them. The font can tell the */
/* user that, for example, Weight=1.5 is `Bold'. */
/* */
/* axis :: A table of axis descriptors. */
/* axis :: An axis descriptor table. */
/* GX fonts contain slightly more data than MM. */
/* */
/* namedstyles :: A table of named styles. */
/* namedstyle :: A named style table. */
/* Only meaningful with GX. */
/* */
typedef struct FT_MM_Var_
@ -280,8 +280,10 @@ FT_BEGIN_HEADER
/* face :: A handle to the source face. */
/* */
/* <Input> */
/* num_coords :: The number of design coordinates (must be equal to */
/* the number of axes in the font). */
/* num_coords :: The number of available design coordinates. If it */
/* is larger than the number of axes, ignore the excess */
/* values. If it is smaller than the number of axes, */
/* use default values for the remaining axes. */
/* */
/* coords :: An array of design coordinates. */
/* */
@ -307,8 +309,10 @@ FT_BEGIN_HEADER
/* face :: A handle to the source face. */
/* */
/* <Input> */
/* num_coords :: The number of design coordinates (must be equal to */
/* the number of axes in the font). */
/* num_coords :: The number of available design coordinates. If it */
/* is larger than the number of axes, ignore the excess */
/* values. If it is smaller than the number of axes, */
/* use default values for the remaining axes. */
/* */
/* coords :: An array of design coordinates. */
/* */
@ -334,8 +338,10 @@ FT_BEGIN_HEADER
/* face :: A handle to the source face. */
/* */
/* <Input> */
/* num_coords :: The number of design coordinates (must be equal to */
/* the number of axes in the font). */
/* num_coords :: The number of available design coordinates. If it */
/* is larger than the number of axes, ignore the excess */
/* values. If it is smaller than the number of axes, */
/* use default values for the remaining axes. */
/* */
/* coords :: The design coordinates array (each element must be */
/* between 0 and 1.0). */

44
src/truetype/ttgxvar.c
View File

@ -864,7 +864,10 @@
/* Initialize the blend structure with `gvar' data. */
/* */
/* <Input> */
/* num_coords :: Must be the axis count of the font. */
/* num_coords :: The number of available coordinates. If it is */
/* larger than the number of axes, ignore the excess */
/* values. If it is smaller than the number of axes, */
/* use the default value (0) for the remaining axes. */
/* */
/* coords :: An array of `num_coords', each between [-1,1]. */
/* */
@ -902,11 +905,8 @@
blend = face->blend;
mmvar = blend->mmvar;
if ( num_coords != mmvar->num_axis )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
if ( num_coords > mmvar->num_axis )
num_coords = mmvar->num_axis;
for ( i = 0; i < num_coords; i++ )
if ( coords[i] < -0x00010000L || coords[i] > 0x00010000L )
@ -921,7 +921,7 @@
if ( blend->normalizedcoords == NULL )
{
if ( FT_NEW_ARRAY( blend->normalizedcoords, num_coords ) )
if ( FT_NEW_ARRAY( blend->normalizedcoords, mmvar->num_axis ) )
goto Exit;
manageCvt = mcvt_modify;
@ -943,13 +943,22 @@
}
}
for ( ; i < mmvar->num_axis; i++ )
{
if ( blend->normalizedcoords[i] != 0 )
{
manageCvt = mcvt_load;
break;
}
}
/* If we don't change the blend coords then we don't need to do */
/* anything to the cvt table. It will be correct. Otherwise we */
/* no longer have the original cvt (it was modified when we set */
/* the blend last time), so we must reload and then modify it. */
}
blend->num_axis = num_coords;
blend->num_axis = mmvar->num_axis;
FT_MEM_COPY( blend->normalizedcoords,
coords,
num_coords * sizeof ( FT_Fixed ) );
@ -1001,7 +1010,10 @@
/* Initialize the blend struct with `gvar' data. */
/* */
/* <Input> */
/* num_coords :: This must be the axis count of the font. */
/* num_coords :: The number of available coordinates. If it is */
/* larger than the number of axes, ignore the excess */
/* values. If it is smaller than the number of axes, */
/* use the default values for the remaining axes. */
/* */
/* coords :: A coordinate array with `num_coords' elements. */
/* */
@ -1032,11 +1044,8 @@
blend = face->blend;
mmvar = blend->mmvar;
if ( num_coords != mmvar->num_axis )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
if ( num_coords > mmvar->num_axis )
num_coords = mmvar->num_axis;
/* Axis normalization is a two stage process. First we normalize */
/* based on the [min,def,max] values for the axis to be [-1,0,1]. */
@ -1046,7 +1055,7 @@
goto Exit;
a = mmvar->axis;
for ( i = 0; i < mmvar->num_axis; i++, a++ )
for ( i = 0; i < num_coords; i++, a++ )
{
if ( coords[i] > a->maximum || coords[i] < a->minimum )
{
@ -1064,6 +1073,9 @@
a->maximum - a->def );
}
for ( ; i < mmvar->num_axis; i++ )
normalized[i] = 0;
if ( !blend->avar_checked )
ft_var_load_avar( face );
@ -1087,7 +1099,7 @@
}
}
error = TT_Set_MM_Blend( face, num_coords, normalized );
error = TT_Set_MM_Blend( face, mmvar->num_axis, normalized );
Exit:
FT_FREE( normalized );

29
src/type1/t1load.c
View File

@ -371,9 +371,12 @@
FT_UInt n, m;
if ( !blend || blend->num_axis != num_coords )
if ( !blend )
return FT_THROW( Invalid_Argument );
if ( num_coords > blend->num_axis )
num_coords = blend->num_axis;
/* recompute the weight vector from the blend coordinates */
for ( n = 0; n < blend->num_designs; n++ )
{
@ -385,8 +388,9 @@
FT_Fixed factor;
/* get current blend axis position */
factor = coords[m];
/* get current blend axis position; */
/* use a default value if we don't have a coordinate */
factor = m < num_coords ? coords[m] : 0x8000;
if ( factor < 0 )
factor = 0;
if ( factor > 0x10000L )
@ -414,14 +418,17 @@
FT_Fixed final_blends[T1_MAX_MM_DESIGNS];
if ( !blend || blend->num_axis != num_coords )
if ( !blend )
return FT_THROW( Invalid_Argument );
if ( num_coords > blend->num_axis )
num_coords = blend->num_axis;
/* compute the blend coordinates through the blend design map */
for ( n = 0; n < blend->num_axis; n++ )
{
FT_Long design = coords[n];
FT_Long design;
FT_Fixed the_blend;
PS_DesignMap map = blend->design_map + n;
FT_Long* designs = map->design_points;
@ -429,6 +436,12 @@
FT_Int before = -1, after = -1;
/* use a default value if we don't have a coordinate */
if ( n < num_coords )
design = coords[n];
else
design = ( designs[map->num_points - 1] - designs[0] ) / 2;
for ( p = 0; p < (FT_UInt)map->num_points; p++ )
{
FT_Long p_design = designs[p];
@ -466,7 +479,7 @@
final_blends[n] = the_blend;
}
return T1_Set_MM_Blend( face, num_coords, final_blends );
return T1_Set_MM_Blend( face, blend->num_axis, final_blends );
}
@ -484,8 +497,8 @@
FT_UInt i;
if ( num_coords > T1_MAX_MM_AXIS || num_coords == 0 )
return FT_THROW( Invalid_Argument );
if ( num_coords > T1_MAX_MM_AXIS )
num_coords = T1_MAX_MM_AXIS;
for ( i = 0; i < num_coords; ++i )
lcoords[i] = FIXED_TO_INT( coords[i] );