334 lines
15 KiB
C
334 lines
15 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 1996-1999 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 <t2errors.h>
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/* required by tracing mode */
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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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/* T2_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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/* resource :: The source font resource. */
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/* face_index :: The index of the font face in the resource. */
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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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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) goto Bad_Format;
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sfnt = (SFNT_Interface*)(sfnt_driver->interface.format_interface);
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if (!sfnt) 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) 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 != 0x4f54544f ) /* OpenType/CFF font */
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{
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FT_TRACE2(( "[not a valid OpenType/CFF font]" ));
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goto Bad_Format;
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}
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/* If we're performing a simple font format check, exit immediately */
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if ( face_index < 0 )
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return FT_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 ) goto Exit;
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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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#if 0
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FT_Memory memory = face->root.memory;
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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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/* XXXXX: TO DO */
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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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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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FT_Error error = FT_Err_Ok;
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if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
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return FT_Err_Invalid_Argument;
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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 error;
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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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/* 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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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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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 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->face->driver->library;
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FT_Memory memory = library->memory;
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if (slot->flags & ft_glyph_own_bitmap)
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FREE( slot->bitmap.buffer );
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FT_Outline_Done( library, &slot->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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FT_Memory memory = driver->root.memory;
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FT_Error error;
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error = FT_New_GlyphZone( memory, 0, 0, &driver->zone );
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if (error) return error;
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/* init extension registry if needed */
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#ifdef T2_CONFIG_OPTION_EXTEND_ENGINE
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return TT_Init_Extensions( driver );
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#else
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return FT_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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/* TT_Done_Driver */
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/* */
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/* <Description> */
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/* Finalizes a given TrueType driver. */
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/* */
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/* <Input> */
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/* driver :: A handle to the target TrueType 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 T2_CONFIG_OPTION_EXTEND_ENGINE
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TT_Done_Extensions( driver );
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#endif
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/* remove the loading glyph zone */
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FT_Done_GlyphZone( &driver->zone );
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}
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/* END */
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