1
/***************************************************************************/
5
/* Quick computation of advance widths (body). */
7
/* Copyright 2008, 2009 by */
8
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
10
/* This file is part of the FreeType project, and may only be used, */
11
/* modified, and distributed under the terms of the FreeType project */
12
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13
/* this file you indicate that you have read the license and */
14
/* understand and accept it fully. */
16
/***************************************************************************/
20
#include FT_ADVANCES_H
21
#include FT_INTERNAL_OBJECTS_H
25
_ft_face_scale_advances( FT_Face face,
34
if ( flags & FT_LOAD_NO_SCALE )
37
if ( face->size == NULL )
38
return FT_Err_Invalid_Size_Handle;
40
if ( flags & FT_LOAD_VERTICAL_LAYOUT )
41
scale = face->size->metrics.y_scale;
43
scale = face->size->metrics.x_scale;
45
/* this must be the same scaling as to get linear{Hori,Vert}Advance */
46
/* (see `FT_Load_Glyph' implementation in src/base/ftobjs.c) */
48
for ( nn = 0; nn < count; nn++ )
49
advances[nn] = FT_MulDiv( advances[nn], scale, 64 );
55
/* at the moment, we can perform fast advance retrieval only in */
56
/* the following cases: */
60
/* - light-hinted load */
62
#define LOAD_ADVANCE_FAST_CHECK( flags ) \
63
( flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) || \
64
FT_LOAD_TARGET_MODE( flags ) == FT_RENDER_MODE_LIGHT )
67
/* documentation is in ftadvanc.h */
69
FT_EXPORT_DEF( FT_Error )
70
FT_Get_Advance( FT_Face face,
75
FT_Face_GetAdvancesFunc func;
79
return FT_Err_Invalid_Face_Handle;
81
if ( gindex >= (FT_UInt)face->num_glyphs )
82
return FT_Err_Invalid_Glyph_Index;
84
func = face->driver->clazz->get_advances;
85
if ( func && LOAD_ADVANCE_FAST_CHECK( flags ) )
90
error = func( face, gindex, 1, flags, padvance );
92
return _ft_face_scale_advances( face, padvance, 1, flags );
94
if ( error != FT_ERROR_BASE( FT_Err_Unimplemented_Feature ) )
98
return FT_Get_Advances( face, gindex, 1, flags, padvance );
102
/* documentation is in ftadvanc.h */
104
FT_EXPORT_DEF( FT_Error )
105
FT_Get_Advances( FT_Face face,
109
FT_Fixed *padvances )
111
FT_Face_GetAdvancesFunc func;
112
FT_UInt num, end, nn;
113
FT_Error error = FT_Err_Ok;
117
return FT_Err_Invalid_Face_Handle;
119
num = (FT_UInt)face->num_glyphs;
121
if ( start >= num || end < start || end > num )
122
return FT_Err_Invalid_Glyph_Index;
127
func = face->driver->clazz->get_advances;
128
if ( func && LOAD_ADVANCE_FAST_CHECK( flags ) )
130
error = func( face, start, count, flags, padvances );
134
if ( error != FT_ERROR_BASE( FT_Err_Unimplemented_Feature ) )
140
if ( flags & FT_ADVANCE_FLAG_FAST_ONLY )
141
return FT_Err_Unimplemented_Feature;
143
flags |= FT_LOAD_ADVANCE_ONLY;
144
for ( nn = 0; nn < count; nn++ )
146
error = FT_Load_Glyph( face, start + nn, flags );
150
padvances[nn] = ( flags & FT_LOAD_VERTICAL_LAYOUT )
151
? face->glyph->advance.y
152
: face->glyph->advance.x;
159
return _ft_face_scale_advances( face, padvances, count, flags );