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#include <ft2build.h>
#include FT_ADVANCES_H
#include FT_INTERNAL_OBJECTS_H
static FT_Error
_ft_face_scale_advances( FT_Face face,
FT_Fixed* advances,
FT_UInt count,
FT_UInt flags )
{
FT_Fixed scale;
FT_UInt nn;
if ( (flags & FT_LOAD_NO_SCALE) )
return FT_Err_Ok;
if ( face->size == NULL )
return FT_Err_Invalid_Size_Handle;
if ( !(flags & FT_LOAD_VERTICAL_LAYOUT) )
scale = face->size->metrics.x_scale;
else
scale = face->size->metrics.y_scale;
/* this must be the same computation than to get linearHori/VertAdvance
* (see FT_Load_Glyph() implementation in src/base/ftobjs.c */
for (nn = 0; nn < count; nn++)
advances[nn] = FT_MulDiv( advances[nn], scale, 64 );
return 0;
}
/* at the moment, we can perform fast advance retrieval only in
the following cases:
- unscaled load
- unhinted load
- light-hinted load
*/
#define LOAD_ADVANCE_FAST_CHECK(flags) \
(((flags & (FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING)) != 0) || \
FT_LOAD_TARGET_MODE(flags) == FT_RENDER_MODE_LIGHT)
FT_EXPORT_DEF(FT_Error)
FT_Get_Advance( FT_Face face,
FT_UInt gindex,
FT_UInt flags,
FT_Fixed *padvance )
{
FT_Face_GetAdvancesFunc func;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if (gindex >= (FT_UInt) face->num_glyphs )
return FT_Err_Invalid_Glyph_Index;
func = face->driver->clazz->get_advances;
if (func != NULL && LOAD_ADVANCE_FAST_CHECK(flags))
{
FT_Error error;
error = func( face, gindex, 1, flags, padvance );
if (!error)
return _ft_face_scale_advances( face, padvance, 1, flags );
if (error != FT_Err_Unimplemented_Feature)
return error;
}
return FT_Get_Advances( face, gindex, 1, flags, padvance );
}
FT_EXPORT_DEF(FT_Error)
FT_Get_Advances( FT_Face face,
FT_UInt start,
FT_UInt count,
FT_UInt flags,
FT_Fixed *padvances )
{
FT_Face_GetAdvancesFunc func;
FT_UInt num, end, nn;
FT_Error error = 0;
if ( !face )
return FT_Err_Invalid_Face_Handle;
num = (FT_UInt) face->num_glyphs;
end = start + count;
if (start >= num || end < start || end > num)
return FT_Err_Invalid_Glyph_Index;
if (count == 0)
return FT_Err_Ok;
func = face->driver->clazz->get_advances;
if (func != NULL && LOAD_ADVANCE_FAST_CHECK(flags))
{
error = func( face, start, count, flags, padvances );
if (!error) goto Exit;
if (error != FT_Err_Unimplemented_Feature)
return error;
}
error = 0;
if ((flags & FT_ADVANCE_FLAG_FAST_ONLY) != 0)
return FT_Err_Unimplemented_Feature;
flags |= FT_LOAD_ADVANCE_ONLY;
for (nn = 0; nn < count; nn++)
{
error = FT_Load_Glyph( face, start+nn, flags );
if (error) break;
padvances[nn] = (flags & FT_LOAD_VERTICAL_LAYOUT)
? face->glyph->advance.x
: face->glyph->advance.y;
}
if (error) return error;
Exit:
return _ft_face_scale_advances( face, padvances, count, flags );
}
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