702 lines
25 KiB
C
702 lines
25 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 1996-2000 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 <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftcalc.h>
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#include <freetype/internal/ftstream.h>
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#include <freetype/ttnameid.h>
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#include <freetype/tttags.h>
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#include <freetype/internal/sfnt.h>
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#include <freetype/internal/psnames.h>
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#include <ttobjs.h>
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#include <ttpload.h>
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#include <freetype/internal/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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/*************************************************************************/
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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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/*************************************************************************/
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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_Init_Face */
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/* */
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/* <Description> */
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/* Initializes 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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/* TrueType error code. 0 means success. */
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/* */
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LOCAL_DEF
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TT_Error TT_Init_Face( FT_Stream stream,
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TT_Face face,
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TT_Int face_index,
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TT_Int num_params,
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FT_Parameter* params )
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{
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TT_Error error;
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FT_Driver sfnt_driver;
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SFNT_Interface* sfnt;
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sfnt_driver = FT_Get_Driver( face->root.driver->library, "sfnt" );
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if ( !sfnt_driver )
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goto Bad_Format;
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sfnt = (SFNT_Interface*)(sfnt_driver->interface.format_interface);
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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 ( FILE_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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if ( face->format_tag != 0x00010000L && /* MS fonts */
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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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/* 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_Load_Locations( face, stream ) ||
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TT_Load_CVT ( face, stream ) ||
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TT_Load_Programs ( face, stream );
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Exit:
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return error;
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Bad_Format:
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error = FT_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_Done_Face */
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/* */
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/* <Description> */
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/* Finalizes 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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LOCAL_DEF
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void TT_Done_Face( TT_Face face )
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{
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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_Interface* sfnt = face->sfnt;
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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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FREE( face->glyph_locations );
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face->num_locations = 0;
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/* freeing the CVT */
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FREE( face->cvt );
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face->cvt_size = 0;
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/* freeing the programs */
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RELEASE_Frame( face->font_program );
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RELEASE_Frame( 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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}
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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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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Init_Size */
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/* */
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/* <Description> */
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/* Initializes 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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/* TrueType error code. 0 means success. */
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/* */
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LOCAL_DEF
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TT_Error TT_Init_Size( TT_Size size )
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{
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TT_Error error = 0;
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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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TT_Int i;
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TT_ExecContext exec;
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TT_UShort n_twilight;
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TT_MaxProfile* maxp = &face->max_profile;
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size->ttmetrics.valid = FALSE;
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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 ( ALLOC_ARRAY( size->function_defs,
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size->max_function_defs,
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TT_DefRecord ) ||
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ALLOC_ARRAY( size->instruction_defs,
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size->max_instruction_defs,
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TT_DefRecord ) ||
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ALLOC_ARRAY( size->cvt,
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size->cvt_size, TT_Long ) ||
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ALLOC_ARRAY( size->storage,
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size->storage_size, TT_Long ) )
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goto Fail_Memory;
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/* reserve twilight zone */
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n_twilight = maxp->maxTwilightPoints;
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error = FT_New_GlyphZone( memory, n_twilight, 0, &size->twilight );
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if ( error )
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goto Fail_Memory;
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size->twilight.n_points = n_twilight;
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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->library;
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face->interpreter = (TT_Interpreter)
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library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
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if ( !face->interpreter )
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face->interpreter = (TT_Interpreter)TT_RunIns;
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}
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/* Fine, now execute the font program! */
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exec = size->context;
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/* size objects used during debugging have their own context */
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if ( !size->debug )
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exec = TT_New_Context( face );
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if ( !exec )
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{
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error = TT_Err_Could_Not_Find_Context;
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goto Fail_Memory;
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}
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size->GS = tt_default_graphics_state;
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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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{
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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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exec->instruction_trap = FALSE;
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exec->cvtSize = size->cvt_size;
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exec->cvt = size->cvt;
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exec->F_dot_P = 0x10000L;
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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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if ( error )
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goto Fail_Exec;
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}
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else
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error = TT_Err_Ok;
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TT_Save_Context( exec, size );
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if ( !size->debug )
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TT_Done_Context( exec );
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#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
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size->ttmetrics.valid = FALSE;
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return error;
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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Fail_Exec:
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if ( !size->debug )
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TT_Done_Context( exec );
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Fail_Memory:
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#endif
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TT_Done_Size( 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_Done_Size */
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/* */
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/* <Description> */
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/* The TrueType size object finalizer. */
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/* */
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/* <Input> */
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/* size :: A handle to the target size object. */
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/* */
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LOCAL_FUNC
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void TT_Done_Size( TT_Size size )
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{
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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FT_Memory memory = size->root.face->memory;
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if ( size->debug )
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{
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/* the debug context must be deleted by the debugger itself */
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size->context = NULL;
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size->debug = FALSE;
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}
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FREE( size->cvt );
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size->cvt_size = 0;
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/* free storage area */
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FREE( size->storage );
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size->storage_size = 0;
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/* twilight zone */
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FT_Done_GlyphZone( &size->twilight );
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FREE( size->function_defs );
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FREE( size->instruction_defs );
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size->num_function_defs = 0;
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size->max_function_defs = 0;
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size->num_instruction_defs = 0;
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size->max_instruction_defs = 0;
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size->max_func = 0;
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size->max_ins = 0;
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#endif
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size->ttmetrics.valid = FALSE;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Reset_Size */
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/* */
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/* <Description> */
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/* Resets a TrueType size when resolutions and character dimensions */
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/* have been changed. */
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/* */
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/* <Input> */
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/* size :: A handle to the target size object. */
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/* */
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LOCAL_DEF
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TT_Error TT_Reset_Size( TT_Size size )
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{
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TT_Face face;
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TT_Error error = TT_Err_Ok;
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FT_Size_Metrics* metrics;
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if ( size->ttmetrics.valid )
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return TT_Err_Ok;
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face = (TT_Face)size->root.face;
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metrics = &size->root.metrics;
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if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
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return TT_Err_Invalid_PPem;
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/* compute new transformation */
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if ( metrics->x_ppem >= metrics->y_ppem )
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{
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size->ttmetrics.scale = metrics->x_scale;
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size->ttmetrics.ppem = metrics->x_ppem;
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size->ttmetrics.x_ratio = 0x10000L;
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size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
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0x10000L,
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metrics->x_ppem );
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}
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else
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{
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size->ttmetrics.scale = metrics->y_scale;
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size->ttmetrics.ppem = metrics->y_ppem;
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size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
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0x10000L,
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metrics->y_ppem );
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size->ttmetrics.y_ratio = 0x10000L;
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}
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/* Compute root ascender, descender, test height, and max_advance */
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metrics->ascender = ( FT_MulFix( face->root.ascender,
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metrics->y_scale ) + 32 ) & -64;
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metrics->descender = ( FT_MulFix( face->root.descender,
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metrics->y_scale ) + 32 ) & -64;
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metrics->height = ( FT_MulFix( face->root.height,
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metrics->y_scale ) + 32 ) & -64;
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metrics->max_advance = ( FT_MulFix( face->root.max_advance_width,
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metrics->x_scale ) + 32 ) & -64;
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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{
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TT_ExecContext exec;
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TT_UInt i, j;
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/* Scale the cvt values to the new ppem. */
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/* We use by default the y ppem to scale the CVT. */
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for ( i = 0; i < size->cvt_size; i++ )
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size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
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/* All twilight points are originally zero */
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for ( j = 0; j < size->twilight.n_points; j++ )
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{
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size->twilight.org[j].x = 0;
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size->twilight.org[j].y = 0;
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size->twilight.cur[j].x = 0;
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size->twilight.cur[j].y = 0;
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}
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/* clear storage area */
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for ( i = 0; i < size->storage_size; i++ )
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size->storage[i] = 0;
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size->GS = tt_default_graphics_state;
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/* get execution context and run prep program */
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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_New_Context( face );
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/* debugging instances have their own 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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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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exec->instruction_trap = FALSE;
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exec->top = 0;
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exec->callTop = 0;
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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 )
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goto Fin;
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if ( !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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size->GS = exec->GS;
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/* save default graphics state */
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Fin:
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TT_Save_Context( exec, size );
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if ( !size->debug )
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TT_Done_Context( exec );
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/* debugging instances keep their context */
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}
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#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
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if ( !error )
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size->ttmetrics.valid = TRUE;
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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_Init_GlyphSlot */
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/* */
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/* <Description> */
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/* The TrueType glyph slot initializer. */
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/* */
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/* <Input> */
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/* slot :: The glyph record to build. */
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/* */
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/* <Output> */
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/* TrueType error code. 0 means success. */
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/* */
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LOCAL_FUNC
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TT_Error TT_Init_GlyphSlot( TT_GlyphSlot slot )
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|
{
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|
/* allocate the outline space */
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|
FT_Face face = slot->face;
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|
FT_Library library = face->driver->library;
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|
|
|
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FT_TRACE4(( "TT_Init_GlyphSlot: Creating outline maxp = %d, maxc = %d\n",
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|
face->max_points, face->max_contours ));
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|
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|
return FT_Outline_New( library,
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|
face->max_points + 2,
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|
face->max_contours,
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|
&slot->outline );
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|
}
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|
|
|
|
|
/*************************************************************************/
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|
/* */
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|
/* <Function> */
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|
/* TT_Done_GlyphSlot */
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|
/* */
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|
/* <Description> */
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|
/* The TrueType glyph slot finalizer. */
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|
/* */
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|
/* <Input> */
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|
/* slot :: A handle to the glyph slot object. */
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|
/* */
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|
LOCAL_FUNC
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|
void TT_Done_GlyphSlot( TT_GlyphSlot slot )
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|
{
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|
FT_Library library = slot->face->driver->library;
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|
FT_Memory memory = library->memory;
|
|
|
|
|
|
if ( slot->flags & ft_glyph_own_bitmap )
|
|
FREE( slot->bitmap.buffer );
|
|
|
|
FT_Outline_Done( library, &slot->outline );
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|
return;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Init_Driver */
|
|
/* */
|
|
/* <Description> */
|
|
/* Initializes a given TrueType driver object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* driver :: A handle to the target driver object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* TrueType error code. 0 means success. */
|
|
/* */
|
|
LOCAL_FUNC
|
|
TT_Error TT_Init_Driver( TT_Driver driver )
|
|
{
|
|
FT_Memory memory = driver->root.memory;
|
|
FT_Error error;
|
|
|
|
|
|
error = FT_New_GlyphZone( memory, 0, 0, &driver->zone );
|
|
if ( error )
|
|
return error;
|
|
|
|
/* init extension registry if needed */
|
|
|
|
#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
|
|
return TT_Init_Extensions( driver );
|
|
#else
|
|
return TT_Err_Ok;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Done_Driver */
|
|
/* */
|
|
/* <Description> */
|
|
/* Finalizes a given TrueType driver. */
|
|
/* */
|
|
/* <Input> */
|
|
/* driver :: A handle to the target TrueType driver. */
|
|
/* */
|
|
LOCAL_FUNC
|
|
void TT_Done_Driver( TT_Driver driver )
|
|
{
|
|
/* destroy extensions registry if needed */
|
|
|
|
#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
|
|
TT_Done_Extensions( driver );
|
|
#endif
|
|
|
|
/* remove the loading glyph zone */
|
|
FT_Done_GlyphZone( &driver->zone );
|
|
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
|
|
/* destroy the execution context */
|
|
if ( driver->context )
|
|
{
|
|
TT_Destroy_Context( driver->context, driver->root.memory );
|
|
driver->context = NULL;
|
|
}
|
|
|
|
#endif
|
|
}
|
|
|
|
|
|
/* END */
|