856 lines
31 KiB
C
856 lines
31 KiB
C
/***************************************************************************/
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/* */
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/* ttobjs.c */
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/* */
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/* Objects manager (body). */
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/* */
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/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_CALC_H
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#include FT_INTERNAL_STREAM_H
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#include FT_TRUETYPE_IDS_H
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#include FT_TRUETYPE_TAGS_H
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#include FT_INTERNAL_SFNT_H
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#include "ttgload.h"
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#include "ttpload.h"
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#include "tterrors.h"
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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#include "ttinterp.h"
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#endif
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#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
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#include FT_TRUETYPE_UNPATENTED_H
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#endif
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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#include "ttgxvar.h"
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#endif
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttobjs
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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/*************************************************************************/
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/* */
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/* GLYPH ZONE FUNCTIONS */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_glyphzone_done */
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/* */
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/* <Description> */
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/* Deallocate a glyph zone. */
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/* */
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/* <Input> */
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/* zone :: A pointer to the target glyph zone. */
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/* */
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FT_LOCAL_DEF( void )
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tt_glyphzone_done( TT_GlyphZone zone )
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{
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FT_Memory memory = zone->memory;
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if ( memory )
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{
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FT_FREE( zone->contours );
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FT_FREE( zone->tags );
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FT_FREE( zone->cur );
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FT_FREE( zone->org );
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zone->max_points = zone->n_points = 0;
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zone->max_contours = zone->n_contours = 0;
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zone->memory = NULL;
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}
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_glyphzone_new */
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/* */
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/* <Description> */
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/* Allocate a new glyph zone. */
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/* */
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/* <Input> */
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/* memory :: A handle to the current memory object. */
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/* */
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/* maxPoints :: The capacity of glyph zone in points. */
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/* */
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/* maxContours :: The capacity of glyph zone in contours. */
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/* */
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/* <Output> */
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/* zone :: A pointer to the target glyph zone record. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_glyphzone_new( FT_Memory memory,
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FT_UShort maxPoints,
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FT_Short maxContours,
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TT_GlyphZone zone )
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{
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FT_Error error;
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FT_MEM_ZERO( zone, sizeof ( *zone ) );
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zone->memory = memory;
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if ( FT_NEW_ARRAY( zone->org, maxPoints ) ||
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FT_NEW_ARRAY( zone->cur, maxPoints ) ||
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FT_NEW_ARRAY( zone->tags, maxPoints ) ||
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FT_NEW_ARRAY( zone->contours, maxContours ) )
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{
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tt_glyphzone_done( zone );
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}
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else
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{
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zone->max_points = maxPoints;
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zone->max_contours = maxContours;
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}
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return error;
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}
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#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_init */
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/* */
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/* <Description> */
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/* Initialize a given TrueType face object. */
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/* */
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/* <Input> */
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/* stream :: The source font stream. */
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/* */
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/* face_index :: The index of the font face in the resource. */
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/* */
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/* num_params :: Number of additional generic parameters. Ignored. */
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/* */
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/* params :: Additional generic parameters. Ignored. */
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/* */
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/* <InOut> */
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/* face :: The newly built face object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_face_init( FT_Stream stream,
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FT_Face ttface, /* TT_Face */
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FT_Int face_index,
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FT_Int num_params,
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FT_Parameter* params )
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{
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FT_Error error;
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FT_Library library;
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SFNT_Service sfnt;
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TT_Face face = (TT_Face)ttface;
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library = face->root.driver->root.library;
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sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
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if ( !sfnt )
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goto Bad_Format;
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/* create input stream from resource */
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if ( FT_STREAM_SEEK( 0 ) )
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goto Exit;
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/* check that we have a valid TrueType file */
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error = sfnt->init_face( stream, face, face_index, num_params, params );
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if ( error )
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goto Exit;
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/* We must also be able to accept Mac/GX fonts, as well as OT ones. */
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/* The 0x00020000 tag is completely undocumented; some fonts from */
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/* Arphic made for Chinese Windows 3.1 have this. */
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if ( face->format_tag != 0x00010000L && /* MS fonts */
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face->format_tag != 0x00020000L && /* CJK fonts for Win 3.1 */
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face->format_tag != TTAG_true ) /* Mac fonts */
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{
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FT_TRACE2(( "[not a valid TTF font]\n" ));
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goto Bad_Format;
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}
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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face->root.face_flags |= FT_FACE_FLAG_HINTER;
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#endif
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/* If we are performing a simple font format check, exit immediately. */
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if ( face_index < 0 )
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return TT_Err_Ok;
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/* Load font directory */
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error = sfnt->load_face( stream, face, face_index, num_params, params );
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if ( error )
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goto Exit;
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error = tt_face_load_hdmx( face, stream );
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if ( error )
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goto Exit;
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if ( face->root.face_flags & FT_FACE_FLAG_SCALABLE )
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{
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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if ( !face->root.internal->incremental_interface )
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error = tt_face_load_loca( face, stream );
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if ( !error )
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error = tt_face_load_cvt( face, stream ) ||
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tt_face_load_fpgm( face, stream ) ||
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tt_face_load_prep( face, stream );
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#else
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if ( !error )
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error = tt_face_load_loca( face, stream ) ||
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tt_face_load_cvt( face, stream ) ||
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tt_face_load_fpgm( face, stream ) ||
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tt_face_load_prep( face, stream );
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#endif
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}
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#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
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/* Determine whether unpatented hinting is to be used for this face. */
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face->unpatented_hinting = FT_BOOL
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( library->debug_hooks[ FT_DEBUG_HOOK_UNPATENTED_HINTING ] != NULL );
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{
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int i;
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for ( i = 0; i < num_params && !face->unpatented_hinting; i++ )
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if ( params[i].tag == FT_PARAM_TAG_UNPATENTED_HINTING )
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face->unpatented_hinting = TRUE;
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}
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#endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING */
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/* initialize standard glyph loading routines */
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TT_Init_Glyph_Loading( face );
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Exit:
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return error;
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Bad_Format:
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error = TT_Err_Unknown_File_Format;
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goto Exit;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_done */
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/* */
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/* <Description> */
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/* Finalize a given face object. */
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/* */
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/* <Input> */
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/* face :: A pointer to the face object to destroy. */
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/* */
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FT_LOCAL_DEF( void )
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tt_face_done( FT_Face ttface ) /* TT_Face */
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{
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TT_Face face = (TT_Face)ttface;
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FT_Memory memory = face->root.memory;
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FT_Stream stream = face->root.stream;
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SFNT_Service sfnt = (SFNT_Service)face->sfnt;
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/* for `extended TrueType formats' (i.e. compressed versions) */
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if ( face->extra.finalizer )
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face->extra.finalizer( face->extra.data );
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if ( sfnt )
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sfnt->done_face( face );
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/* freeing the locations table */
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tt_face_done_loca( face );
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tt_face_free_hdmx( face );
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/* freeing the CVT */
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FT_FREE( face->cvt );
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face->cvt_size = 0;
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/* freeing the programs */
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FT_FRAME_RELEASE( face->font_program );
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FT_FRAME_RELEASE( face->cvt_program );
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face->font_program_size = 0;
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face->cvt_program_size = 0;
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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tt_done_blend( memory, face->blend );
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face->blend = NULL;
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#endif
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}
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/*************************************************************************/
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/* */
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/* SIZE FUNCTIONS */
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/* */
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/*************************************************************************/
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_size_run_fpgm */
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/* */
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/* <Description> */
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/* Run the font program. */
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/* */
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/* <Input> */
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/* size :: A handle to the size object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_size_run_fpgm( TT_Size size )
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{
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TT_Face face = (TT_Face)size->root.face;
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TT_ExecContext exec;
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FT_Error error;
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/* debugging instances have their own context */
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if ( size->debug )
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exec = size->context;
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else
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exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
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if ( !exec )
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return TT_Err_Could_Not_Find_Context;
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TT_Load_Context( exec, face, size );
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exec->callTop = 0;
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exec->top = 0;
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exec->period = 64;
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exec->phase = 0;
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exec->threshold = 0;
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exec->instruction_trap = FALSE;
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exec->F_dot_P = 0x10000L;
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{
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FT_Size_Metrics* metrics = &exec->metrics;
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TT_Size_Metrics* tt_metrics = &exec->tt_metrics;
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metrics->x_ppem = 0;
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metrics->y_ppem = 0;
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metrics->x_scale = 0;
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metrics->y_scale = 0;
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tt_metrics->ppem = 0;
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tt_metrics->scale = 0;
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tt_metrics->ratio = 0x10000L;
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}
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/* allow font program execution */
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TT_Set_CodeRange( exec,
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tt_coderange_font,
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face->font_program,
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face->font_program_size );
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/* disable CVT and glyph programs coderange */
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TT_Clear_CodeRange( exec, tt_coderange_cvt );
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TT_Clear_CodeRange( exec, tt_coderange_glyph );
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if ( face->font_program_size > 0 )
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{
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error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 );
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if ( !error )
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error = face->interpreter( exec );
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}
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else
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error = TT_Err_Ok;
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if ( !error )
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TT_Save_Context( exec, size );
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_size_run_prep */
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/* */
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/* <Description> */
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/* Run the control value program. */
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/* */
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/* <Input> */
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/* size :: A handle to the size object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_size_run_prep( TT_Size size )
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{
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TT_Face face = (TT_Face)size->root.face;
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TT_ExecContext exec;
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FT_Error error;
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/* debugging instances have their own context */
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if ( size->debug )
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exec = size->context;
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else
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exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
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if ( !exec )
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return TT_Err_Could_Not_Find_Context;
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TT_Load_Context( exec, face, size );
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exec->callTop = 0;
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exec->top = 0;
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exec->instruction_trap = FALSE;
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TT_Set_CodeRange( exec,
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tt_coderange_cvt,
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face->cvt_program,
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face->cvt_program_size );
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TT_Clear_CodeRange( exec, tt_coderange_glyph );
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if ( face->cvt_program_size > 0 )
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{
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error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 );
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if ( !error && !size->debug )
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error = face->interpreter( exec );
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}
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else
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error = TT_Err_Ok;
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/* save as default graphics state */
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size->GS = exec->GS;
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TT_Save_Context( exec, size );
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return error;
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}
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#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_size_init */
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/* */
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/* <Description> */
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/* Initialize a new TrueType size object. */
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/* */
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/* <InOut> */
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/* size :: A handle to the size object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_size_init( FT_Size ttsize ) /* TT_Size */
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{
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TT_Size size = (TT_Size)ttsize;
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FT_Error error = TT_Err_Ok;
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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TT_Face face = (TT_Face)size->root.face;
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FT_Memory memory = face->root.memory;
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FT_Int i;
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FT_UShort n_twilight;
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TT_MaxProfile* maxp = &face->max_profile;
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size->max_function_defs = maxp->maxFunctionDefs;
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size->max_instruction_defs = maxp->maxInstructionDefs;
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size->num_function_defs = 0;
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size->num_instruction_defs = 0;
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size->max_func = 0;
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size->max_ins = 0;
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size->cvt_size = face->cvt_size;
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size->storage_size = maxp->maxStorage;
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/* Set default metrics */
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{
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FT_Size_Metrics* metrics = &size->root.metrics;
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TT_Size_Metrics* metrics2 = &size->ttmetrics;
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metrics->x_ppem = 0;
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metrics->y_ppem = 0;
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metrics2->rotated = FALSE;
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metrics2->stretched = FALSE;
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/* set default compensation (all 0) */
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for ( i = 0; i < 4; i++ )
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metrics2->compensations[i] = 0;
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}
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/* allocate function defs, instruction defs, cvt, and storage area */
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if ( FT_NEW_ARRAY( size->function_defs, size->max_function_defs ) ||
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FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) ||
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FT_NEW_ARRAY( size->cvt, size->cvt_size ) ||
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FT_NEW_ARRAY( size->storage, size->storage_size ) )
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{
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tt_size_done( ttsize );
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return error;
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}
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/* reserve twilight zone */
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n_twilight = maxp->maxTwilightPoints;
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/* there are 4 phantom points (do we need this?) */
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n_twilight += 4;
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error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight );
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if ( error )
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{
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tt_size_done( ttsize );
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return error;
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}
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size->twilight.n_points = n_twilight;
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size->GS = tt_default_graphics_state;
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/* set `face->interpreter' according to the debug hook present */
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{
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FT_Library library = face->root.driver->root.library;
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|
|
face->interpreter = (TT_Interpreter)
|
|
library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
|
|
if ( !face->interpreter )
|
|
face->interpreter = (TT_Interpreter)TT_RunIns;
|
|
}
|
|
|
|
/* Fine, now run the font program! */
|
|
error = tt_size_run_fpgm( size );
|
|
|
|
if ( error )
|
|
tt_size_done( ttsize );
|
|
|
|
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
|
|
|
|
size->ttmetrics.valid = FALSE;
|
|
size->strike_index = 0xFFFFFFFFUL;
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_size_done */
|
|
/* */
|
|
/* <Description> */
|
|
/* The TrueType size object finalizer. */
|
|
/* */
|
|
/* <Input> */
|
|
/* size :: A handle to the target size object. */
|
|
/* */
|
|
FT_LOCAL_DEF( void )
|
|
tt_size_done( FT_Size ttsize ) /* TT_Size */
|
|
{
|
|
TT_Size size = (TT_Size)ttsize;
|
|
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
|
|
FT_Memory memory = size->root.face->memory;
|
|
|
|
|
|
if ( size->debug )
|
|
{
|
|
/* the debug context must be deleted by the debugger itself */
|
|
size->context = NULL;
|
|
size->debug = FALSE;
|
|
}
|
|
|
|
FT_FREE( size->cvt );
|
|
size->cvt_size = 0;
|
|
|
|
/* free storage area */
|
|
FT_FREE( size->storage );
|
|
size->storage_size = 0;
|
|
|
|
/* twilight zone */
|
|
tt_glyphzone_done( &size->twilight );
|
|
|
|
FT_FREE( size->function_defs );
|
|
FT_FREE( size->instruction_defs );
|
|
|
|
size->num_function_defs = 0;
|
|
size->max_function_defs = 0;
|
|
size->num_instruction_defs = 0;
|
|
size->max_instruction_defs = 0;
|
|
|
|
size->max_func = 0;
|
|
size->max_ins = 0;
|
|
|
|
#endif
|
|
|
|
size->ttmetrics.valid = FALSE;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_size_reset */
|
|
/* */
|
|
/* <Description> */
|
|
/* Reset a TrueType size when resolutions and character dimensions */
|
|
/* have been changed. */
|
|
/* */
|
|
/* <Input> */
|
|
/* size :: A handle to the target size object. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_size_reset( TT_Size size )
|
|
{
|
|
TT_Face face;
|
|
FT_Error error = TT_Err_Ok;
|
|
FT_Size_Metrics* metrics;
|
|
|
|
|
|
size->ttmetrics.valid = FALSE;
|
|
|
|
face = (TT_Face)size->root.face;
|
|
|
|
metrics = &size->metrics;
|
|
|
|
/* copy the result from base layer */
|
|
*metrics = size->root.metrics;
|
|
|
|
if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
|
|
return TT_Err_Invalid_PPem;
|
|
|
|
/* This bit flag, if set, indicates that the ppems must be */
|
|
/* rounded to integers. Nearly all TrueType fonts have this bit */
|
|
/* set, as hinting won't work really well otherwise. */
|
|
/* */
|
|
if ( face->header.Flags & 8 )
|
|
{
|
|
metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
|
|
face->root.units_per_EM );
|
|
metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
|
|
face->root.units_per_EM );
|
|
|
|
metrics->ascender =
|
|
FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) );
|
|
metrics->descender =
|
|
FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) );
|
|
metrics->height =
|
|
FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) );
|
|
metrics->max_advance =
|
|
FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width,
|
|
metrics->x_scale ) );
|
|
}
|
|
|
|
/* compute new transformation */
|
|
if ( metrics->x_ppem >= metrics->y_ppem )
|
|
{
|
|
size->ttmetrics.scale = metrics->x_scale;
|
|
size->ttmetrics.ppem = metrics->x_ppem;
|
|
size->ttmetrics.x_ratio = 0x10000L;
|
|
size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
|
|
0x10000L,
|
|
metrics->x_ppem );
|
|
}
|
|
else
|
|
{
|
|
size->ttmetrics.scale = metrics->y_scale;
|
|
size->ttmetrics.ppem = metrics->y_ppem;
|
|
size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
|
|
0x10000L,
|
|
metrics->y_ppem );
|
|
size->ttmetrics.y_ratio = 0x10000L;
|
|
}
|
|
|
|
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
|
|
{
|
|
FT_UInt i;
|
|
|
|
|
|
/* Scale the cvt values to the new ppem. */
|
|
/* We use by default the y ppem to scale the CVT. */
|
|
for ( i = 0; i < size->cvt_size; i++ )
|
|
size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
|
|
|
|
/* All twilight points are originally zero */
|
|
for ( i = 0; i < (FT_UInt)size->twilight.n_points; i++ )
|
|
{
|
|
size->twilight.org[i].x = 0;
|
|
size->twilight.org[i].y = 0;
|
|
size->twilight.cur[i].x = 0;
|
|
size->twilight.cur[i].y = 0;
|
|
}
|
|
|
|
/* clear storage area */
|
|
for ( i = 0; i < (FT_UInt)size->storage_size; i++ )
|
|
size->storage[i] = 0;
|
|
|
|
size->GS = tt_default_graphics_state;
|
|
|
|
error = tt_size_run_prep( size );
|
|
}
|
|
|
|
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
|
|
|
|
if ( !error )
|
|
size->ttmetrics.valid = TRUE;
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_driver_init */
|
|
/* */
|
|
/* <Description> */
|
|
/* Initialize a given TrueType driver object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* driver :: A handle to the target driver object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_driver_init( FT_Module ttdriver ) /* TT_Driver */
|
|
{
|
|
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
|
|
TT_Driver driver = (TT_Driver)ttdriver;
|
|
|
|
|
|
if ( !TT_New_Context( driver ) )
|
|
return TT_Err_Could_Not_Find_Context;
|
|
|
|
#else
|
|
|
|
FT_UNUSED( ttdriver );
|
|
|
|
#endif
|
|
|
|
return TT_Err_Ok;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_driver_done */
|
|
/* */
|
|
/* <Description> */
|
|
/* Finalize a given TrueType driver. */
|
|
/* */
|
|
/* <Input> */
|
|
/* driver :: A handle to the target TrueType driver. */
|
|
/* */
|
|
FT_LOCAL_DEF( void )
|
|
tt_driver_done( FT_Module ttdriver ) /* TT_Driver */
|
|
{
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
TT_Driver driver = (TT_Driver)ttdriver;
|
|
|
|
|
|
/* destroy the execution context */
|
|
if ( driver->context )
|
|
{
|
|
TT_Done_Context( driver->context );
|
|
driver->context = NULL;
|
|
}
|
|
#else
|
|
FT_UNUSED( ttdriver );
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_slot_init */
|
|
/* */
|
|
/* <Description> */
|
|
/* Initialize a new slot object. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* slot :: A handle to the slot object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_slot_init( FT_GlyphSlot slot )
|
|
{
|
|
return FT_GlyphLoader_CreateExtra( slot->internal->loader );
|
|
}
|
|
|
|
|
|
/* END */
|