381 lines
17 KiB
C
381 lines
17 KiB
C
/***************************************************************************/
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/* */
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/* t2objs.c */
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/* */
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/* OpenType 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 <t2objs.h>
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#include <t2load.h>
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#include <freetype/internal/t2errors.h>
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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_t2objs
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/*************************************************************************/
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/* */
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/* FACE 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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/* T2_Init_Face */
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/* */
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/* <Description> */
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/* Initializes a given OpenType 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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FT_Error T2_Init_Face( FT_Stream stream,
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T2_Face 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_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 OpenType 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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if ( face->format_tag != 0x4f54544fL ) /* OpenType/CFF font */
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{
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FT_TRACE2(( "[not a valid OpenType/CFF 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 T2_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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/* now, load the CFF part of the file.. */
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error = face->goto_table( face, TTAG_CFF, stream, 0 );
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if ( error )
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goto Exit;
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{
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CFF_Font* cff;
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FT_Memory memory = face->root.memory;
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FT_Face root;
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if ( ALLOC( cff, sizeof ( *cff ) ) )
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goto Exit;
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face->other = cff;
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error = T2_Load_CFF_Font( stream, face_index, cff );
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if ( error )
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goto Exit;
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/* Complement the root flags with some interesting information. */
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/* note that for OpenType/CFF, there is no need to do this, but */
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/* this will be necessary for pure CFF fonts through. */
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root = &face->root;
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}
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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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/* T2_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 T2_Done_Face( T2_Face face )
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{
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FT_Memory memory = face->root.memory;
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#if 0
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FT_Stream stream = face->root.stream;
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#endif
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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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{
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CFF_Font* cff = (CFF_Font*)face->other;
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if ( cff )
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{
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T2_Done_CFF_Font( cff );
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FREE( face->other );
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}
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}
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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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/* T2_Init_Size */
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/* */
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/* <Description> */
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/* Initializes a new OpenType 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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FT_Error T2_Init_Size( T2_Size size )
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{
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UNUSED( size );
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return 0;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Done_Size */
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/* */
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/* <Description> */
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/* The OpenType 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 T2_Done_Size( T2_Size size )
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{
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UNUSED( size );
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Reset_Size */
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/* */
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/* <Description> */
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/* Resets a OpenType 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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/* <Output> */
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/* TrueType error code. 0 means success. */
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/* */
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LOCAL_DEF
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FT_Error T2_Reset_Size( T2_Size size )
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{
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T2_Face face = (T2_Face)size->face;
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FT_Size_Metrics* metrics = &size->metrics;
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if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
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return T2_Err_Invalid_PPem;
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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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return T2_Err_Ok;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Init_GlyphSlot */
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/* */
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/* <Description> */
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/* The OpenType 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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FT_Error T2_Init_GlyphSlot( T2_GlyphSlot slot )
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{
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FT_Library library = slot->root.face->driver->library;
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slot->max_points = 0;
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slot->max_contours = 0;
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slot->root.bitmap.buffer = 0;
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return FT_Outline_New( library, 0, 0, &slot->root.outline );
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Done_GlyphSlot */
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/* */
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/* <Description> */
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/* The OpenType 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 T2_Done_GlyphSlot( T2_GlyphSlot slot )
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{
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FT_Library library = slot->root.face->driver->library;
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FT_Memory memory = library->memory;
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if ( slot->root.flags & ft_glyph_own_bitmap )
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FREE( slot->root.bitmap.buffer );
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FT_Outline_Done( library, &slot->root.outline );
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return;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Init_Driver */
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/* */
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/* <Description> */
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/* Initializes a given OpenType driver object. */
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/* */
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/* <Input> */
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/* driver :: A handle to the target driver 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_FUNC
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FT_Error T2_Init_Driver( T2_Driver driver )
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{
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/* init extension registry if needed */
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#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
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return TT_Init_Extensions( driver );
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#else
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return T2_Err_Ok;
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#endif
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Done_Driver */
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/* */
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/* <Description> */
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/* Finalizes a given OpenType driver. */
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/* */
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/* <Input> */
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/* driver :: A handle to the target OpenType driver. */
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/* */
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LOCAL_FUNC
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void T2_Done_Driver( T2_Driver driver )
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{
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/* destroy extensions registry if needed */
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#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
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TT_Done_Extensions( driver );
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#endif
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}
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/* END */
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