diff options
Diffstat (limited to 'src/base/ftadvanc.c')
| -rw-r--r-- | src/base/ftadvanc.c | 122 |
1 files changed, 79 insertions, 43 deletions
diff --git a/src/base/ftadvanc.c b/src/base/ftadvanc.c index 626a0cf..504f9d2 100644 --- a/src/base/ftadvanc.c +++ b/src/base/ftadvanc.c @@ -1,71 +1,97 @@ +/***************************************************************************/ +/* */ +/* ftadvanc.c */ +/* */ +/* Quick computation of advance widths (body). */ +/* */ +/* Copyright 2008, 2009 by */ +/* David Turner, Robert Wilhelm, and Werner Lemberg. */ +/* */ +/* This file is part of the FreeType project, and may only be used, */ +/* modified, and distributed under the terms of the FreeType project */ +/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ +/* this file you indicate that you have read the license and */ +/* understand and accept it fully. */ +/* */ +/***************************************************************************/ + + #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_Int32 flags ) { FT_Fixed scale; FT_UInt nn; - if ( (flags & FT_LOAD_NO_SCALE) ) + + 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 + if ( flags & FT_LOAD_VERTICAL_LAYOUT ) scale = face->size->metrics.y_scale; + else + scale = face->size->metrics.x_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++) + /* this must be the same scaling as to get linear{Hori,Vert}Advance */ + /* (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; + return FT_Err_Ok; } -/* at the moment, we can perform fast advance retrieval only in - the following cases: + /* 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 ) || \ + FT_LOAD_TARGET_MODE( flags ) == FT_RENDER_MODE_LIGHT ) - - 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) + /* documentation is in ftadvanc.h */ + + FT_EXPORT_DEF( FT_Error ) FT_Get_Advance( FT_Face face, FT_UInt gindex, - FT_UInt flags, + FT_Int32 flags, FT_Fixed *padvance ) { FT_Face_GetAdvancesFunc func; + if ( !face ) return FT_Err_Invalid_Face_Handle; - if (gindex >= (FT_UInt) face->num_glyphs ) + 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)) + if ( func && LOAD_ADVANCE_FAST_CHECK( flags ) ) { FT_Error error; + error = func( face, gindex, 1, flags, padvance ); - if (!error) + if ( !error ) return _ft_face_scale_advances( face, padvance, 1, flags ); - if (error != FT_Err_Unimplemented_Feature) + if ( error != FT_ERROR_BASE( FT_Err_Unimplemented_Feature ) ) return error; } @@ -73,55 +99,65 @@ } - FT_EXPORT_DEF(FT_Error) + /* documentation is in ftadvanc.h */ + + FT_EXPORT_DEF( FT_Error ) FT_Get_Advances( FT_Face face, FT_UInt start, FT_UInt count, - FT_UInt flags, + FT_Int32 flags, FT_Fixed *padvances ) { FT_Face_GetAdvancesFunc func; FT_UInt num, end, nn; - FT_Error error = 0; + FT_Error error = FT_Err_Ok; + if ( !face ) return FT_Err_Invalid_Face_Handle; - num = (FT_UInt) face->num_glyphs; + num = (FT_UInt)face->num_glyphs; end = start + count; - if (start >= num || end < start || end > num) + if ( start >= num || end < start || end > num ) return FT_Err_Invalid_Glyph_Index; - if (count == 0) - return FT_Err_Ok; + if ( count == 0 ) + return FT_Err_Ok; func = face->driver->clazz->get_advances; - if (func != NULL && LOAD_ADVANCE_FAST_CHECK(flags)) + if ( func && LOAD_ADVANCE_FAST_CHECK( flags ) ) { error = func( face, start, count, flags, padvances ); - if (!error) goto Exit; + if ( !error ) + goto Exit; - if (error != FT_Err_Unimplemented_Feature) + if ( error != FT_ERROR_BASE( FT_Err_Unimplemented_Feature ) ) return error; } - error = 0; + error = FT_Err_Ok; - if ((flags & FT_ADVANCE_FLAG_FAST_ONLY) != 0) + if ( flags & FT_ADVANCE_FLAG_FAST_ONLY ) return FT_Err_Unimplemented_Feature; flags |= FT_LOAD_ADVANCE_ONLY; - for (nn = 0; nn < count; nn++) + for ( nn = 0; nn < count; nn++ ) { - error = FT_Load_Glyph( face, start+nn, flags ); - if (error) break; + 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; + padvances[nn] = ( flags & FT_LOAD_VERTICAL_LAYOUT ) + ? face->glyph->advance.y + : face->glyph->advance.x; } - if (error) return error; + + if ( error ) + return error; Exit: return _ft_face_scale_advances( face, padvances, count, flags ); } + + +/* END */ |