| #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 ); |
| } |