ref: 4d1f7af17b4b0966d5ed7fab215fc855fe459345
dir: /src/pfr/pfrcmap.c/
/***************************************************************************/ /* */ /* pfrcmap.c */ /* */ /* FreeType PFR cmap handling (body). */ /* */ /* Copyright 2002-2015 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_INTERNAL_DEBUG_H #include "pfrcmap.h" #include "pfrobjs.h" #include "pfrerror.h" FT_CALLBACK_DEF( FT_Error ) pfr_cmap_init( PFR_CMap cmap, FT_Pointer pointer ) { FT_Error error = FT_Err_Ok; PFR_Face face = (PFR_Face)FT_CMAP_FACE( cmap ); FT_UNUSED( pointer ); cmap->num_chars = face->phy_font.num_chars; cmap->chars = face->phy_font.chars; /* just for safety, check that the character entries are correctly */ /* sorted in increasing character code order */ { FT_UInt n; for ( n = 1; n < cmap->num_chars; n++ ) { if ( cmap->chars[n - 1].char_code >= cmap->chars[n].char_code ) { error = FT_THROW( Invalid_Table ); goto Exit; } } } Exit: return error; } FT_CALLBACK_DEF( void ) pfr_cmap_done( PFR_CMap cmap ) { cmap->chars = NULL; cmap->num_chars = 0; } FT_CALLBACK_DEF( FT_UInt ) pfr_cmap_char_index( PFR_CMap cmap, FT_UInt32 char_code ) { FT_UInt min = 0; FT_UInt max = cmap->num_chars; while ( min < max ) { PFR_Char gchar; FT_UInt mid; mid = min + ( max - min ) / 2; gchar = cmap->chars + mid; if ( gchar->char_code == char_code ) return mid + 1; if ( gchar->char_code < char_code ) min = mid + 1; else max = mid; } return 0; } FT_CALLBACK_DEF( FT_UInt32 ) pfr_cmap_char_next( PFR_CMap cmap, FT_UInt32 *pchar_code ) { FT_UInt result = 0; FT_UInt32 char_code = *pchar_code + 1; Restart: { FT_UInt min = 0; FT_UInt max = cmap->num_chars; FT_UInt mid; PFR_Char gchar; while ( min < max ) { mid = min + ( ( max - min ) >> 1 ); gchar = cmap->chars + mid; if ( gchar->char_code == char_code ) { result = mid; if ( result != 0 ) { result++; goto Exit; } char_code++; goto Restart; } if ( gchar->char_code < char_code ) min = mid+1; else max = mid; } /* we didn't find it, but we have a pair just above it */ char_code = 0; if ( min < cmap->num_chars ) { gchar = cmap->chars + min; result = min; if ( result != 0 ) { result++; char_code = gchar->char_code; } } } Exit: *pchar_code = char_code; return result; } FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec pfr_cmap_class_rec = { sizeof ( PFR_CMapRec ), (FT_CMap_InitFunc) pfr_cmap_init, (FT_CMap_DoneFunc) pfr_cmap_done, (FT_CMap_CharIndexFunc)pfr_cmap_char_index, (FT_CMap_CharNextFunc) pfr_cmap_char_next, NULL, NULL, NULL, NULL, NULL }; /* END */