kc3-lang/freetype/src/truetype/ttobjs.c
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Hash : fc1f9894
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Date : 2000-01-07T18:44:50
Finally, the TrueType driver was completely audited. The code should now be 100% compatible with the implementation in FreeType 1.x. It's now time to make a new tag for the repository :-) - David
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src/truetype/ttobjs.c
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/***************************************************************************/ /* */ /* ttobjs.c */ /* */ /* Objects manager (body). */ /* */ /* Copyright 1996-1999 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used */ /* modified and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include <freetype.h> #include <ftdebug.h> #include <ftcalc.h> #include <ftstream.h> #include <ttnameid.h> #include <sfnt.h> #include <ttpload.h> #include <ttinterp.h> #include <tterrors.h> /* required by tracing mode */ #undef FT_COMPONENT #define FT_COMPONENT trace_ttobjs /*************************************************************************/ /* */ /* GLYPH ZONE FUNCTIONS */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* TT_New_GlyphZone */ /* */ /* <Description> */ /* Allocates a new glyph zone. */ /* */ /* <Input> */ /* memory :: A handle to the current memory object. */ /* */ /* maxPoints :: The capacity of glyph zone in points. */ /* */ /* maxContours :: The capacity of glyph zone in contours. */ /* */ /* <InOut> */ /* pts :: A pointer to the target glyph zone record. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_FUNC TT_Error TT_New_GlyphZone( FT_Memory memory, TT_GlyphZone* pts, TT_UShort maxPoints, TT_Short maxContours ) { TT_Error error; if ( ALLOC( pts->org, maxPoints * 2 * sizeof ( TT_F26Dot6 ) ) || ALLOC( pts->cur, maxPoints * 2 * sizeof ( TT_F26Dot6 ) ) || ALLOC( pts->touch, maxPoints * sizeof ( TT_Byte ) ) || ALLOC( pts->contours, maxContours * sizeof ( TT_UShort ) ) ) return error; return TT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_GlyphZone */ /* */ /* <Description> */ /* Deallocates a glyph zone. */ /* */ /* <Input> */ /* memory :: A handle to the current memory object. */ /* */ /* pts :: A pointer to the target glyph zone record. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_FUNC TT_Error TT_Done_GlyphZone( FT_Memory memory, TT_GlyphZone* pts ) { FREE( pts->contours ); FREE( pts->touch ); FREE( pts->cur ); FREE( pts->org ); return TT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* Get_Name */ /* */ /* <Description> */ /* Returns a given ENGLISH name record in ASCII. */ /* */ /* <Input> */ /* face :: A handle to the source face object. */ /* */ /* nameid :: The name id of the name record to return. */ /* */ /* <Return> */ /* Char string. NULL if no name is present. */ /* */ static FT_String* Get_Name( TT_Face face, TT_UShort nameid ) { FT_Memory memory = face->root.memory; TT_UShort n; TT_NameRec* rec; TT_Bool wide_chars = 1; /* first pass, look for a given name record */ rec = face->name_table.names; for ( n = 0; n < face->name_table.numNameRecords; n++, rec++ ) { if ( rec->nameID == nameid ) { /* found the name - now create an ASCII string from it */ TT_Bool found = 0; /* Test for Microsoft English language */ if ( rec->platformID == TT_PLATFORM_MICROSOFT && rec->encodingID < TT_MS_ID_UNICODE_CS && (rec->languageID & 0x3FF) == 0x009 ) found = 1; /* Test for Apple Unicode encoding */ else if ( rec->platformID == TT_PLATFORM_APPLE_UNICODE ) found = 1; /* Test for Apple Roman */ else if ( rec->platformID == TT_PLATFORM_MACINTOSH && rec->languageID == TT_MAC_ID_ROMAN ) { found = 1; wide_chars = 0; } /* Found a Unicode Name */ if ( found ) { TT_String* string; TT_UInt len; if ( wide_chars ) { TT_UInt m; len = (TT_UInt)rec->stringLength / 2; if ( MEM_Alloc( string, len + 1 ) ) return NULL; for ( m = 0; m < len; m ++ ) string[m] = rec->string[2*m + 1]; } else { len = rec->stringLength; if ( MEM_Alloc( string, len + 1 ) ) return NULL; MEM_Copy( string, rec->string, len ); } string[len] = '\0'; return string; } } } return NULL; } #undef LOAD_ #define LOAD_(x) ( (error = sfnt->load_##x( face, stream )) != TT_Err_Ok ) /*************************************************************************/ /* */ /* <Function> */ /* TT_Init_Face */ /* */ /* <Description> */ /* Initializes a given TrueType face object. */ /* */ /* <Input> */ /* resource :: The source font resource. */ /* face_index :: The index of the font face in the resource. */ /* face :: The newly built face object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_DEF TT_Error TT_Init_Face( FT_Stream stream, TT_Long face_index, TT_Face face ) { TT_Error error; SFNT_Interface* sfnt; sfnt = (SFNT_Interface*)face->sfnt; if (!sfnt) { /* look-up the SFNT driver */ FT_Driver sfnt_driver; sfnt_driver = FT_Get_Driver( face->root.driver->library, "sfnt" ); if (!sfnt_driver) return FT_Err_Invalid_File_Format; sfnt = (SFNT_Interface*)(sfnt_driver->interface.format_interface); if (!sfnt) return FT_Err_Invalid_File_Format; face->sfnt = sfnt; face->goto_table = sfnt->goto_table; } /* create input stream from resource */ if ( FILE_Seek(0) ) goto Exit; /* Load collection directory if present, then font directory */ error = sfnt->load_directory( face, stream, face_index ); if ( error ) goto Exit; face->root.num_faces = face->ttc_header.DirCount; if ( face->root.num_faces < 1 ) face->root.num_faces = 1; /* If we're performing a simple font format check, exit immediately */ if ( face_index < 0 ) return TT_Err_Ok; /* Load tables */ if ( LOAD_( header ) || LOAD_( max_profile ) || (error = sfnt->load_metrics( face, stream, 0 )) != TT_Err_Ok || /* load the `hhea' & `hmtx' tables at once */ (error = sfnt->load_metrics( face, stream, 1 )) != TT_Err_Ok || /* try to load the `vhea' & `vmtx' at once if present */ LOAD_( charmaps ) || LOAD_( names ) || LOAD_( os2 ) || LOAD_( psnames ) || /* the optional tables */ #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS LOAD_( sbits ) || #endif LOAD_( hdmx ) || LOAD_( gasp ) || LOAD_( kerning ) || (error = TT_Load_Locations( face, stream )) != TT_Err_Ok || (error = TT_Load_CVT ( face, stream )) != TT_Err_Ok || (error = TT_Load_Programs ( face, stream )) != TT_Err_Ok ) goto Exit; #ifdef TT_CONFIG_OPTION_EXTEND_ENGINE if ( ( error = TT_Extension_Create( face ) ) != TT_Err_Ok ) goto Exit; #endif face->root.family_name = Get_Name( face, TT_NAME_ID_FONT_FAMILY ); face->root.style_name = Get_Name( face, TT_NAME_ID_FONT_SUBFAMILY ); Exit: return error; } #undef LOAD_ /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_Face */ /* */ /* <Description> */ /* Finalizes a given face object. */ /* */ /* <Input> */ /* face :: A pointer to the face object to destroy. */ /* */ LOCAL_DEF void TT_Done_Face( TT_Face face ) { TT_UShort n; FT_Memory memory = face->root.memory; SFNT_Interface* sfnt = face->sfnt; if (sfnt) { /* destroy the postscript names table if it is supported */ if (sfnt->load_psnames) sfnt->free_psnames( face ); /* destroy the embedded bitmaps table if it is supported */ if (sfnt->load_sbits) sfnt->free_sbits( face ); } /* freeing the kerning table */ FREE( face->kern_pairs ); face->num_kern_pairs = 0; /* freeing the collection table */ FREE( face->ttc_header.TableDirectory ); face->ttc_header.DirCount = 0; /* freeing table directory */ FREE( face->dir_tables ); face->num_tables = 0; /* freeing the locations table */ FREE( face->glyph_locations ); face->num_locations = 0; /* freeing the character mapping tables */ if (sfnt && sfnt->load_charmaps ) { for ( n = 0; n < face->num_charmaps; n++ ) sfnt->free_charmap( face, &face->charmaps[n].cmap ); } FREE( face->charmaps ); face->num_charmaps = 0; FREE( face->root.charmaps ); face->root.num_charmaps = 0; face->root.charmap = 0; /* freeing the CVT */ FREE( face->cvt ); face->cvt_size = 0; /* freeing the horizontal metrics */ FREE( face->horizontal.long_metrics ); FREE( face->horizontal.short_metrics ); /* freeing the vertical ones, if any */ if ( face->vertical_info ) { FREE( face->vertical.long_metrics ); FREE( face->vertical.short_metrics ); face->vertical_info = 0; } /* freeing the programs */ FREE( face->font_program ); FREE( face->cvt_program ); face->font_program_size = 0; face->cvt_program_size = 0; /* freeing the gasp table */ FREE( face->gasp.gaspRanges ); face->gasp.numRanges = 0; /* freeing the name table */ sfnt->free_names( face ); /* freeing the hdmx table */ sfnt->free_hdmx( face ); /* freeing family and style name */ FREE( face->root.family_name ); FREE( face->root.style_name ); face->sfnt = 0; } /*************************************************************************/ /* */ /* SIZE FUNCTIONS */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* TT_Init_Size */ /* */ /* <Description> */ /* Initializes a new TrueType size object. */ /* */ /* <InOut> */ /* size :: A handle to the size object. */ /* */ /* <Return> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_DEF TT_Error TT_Init_Size( TT_Size size ) { TT_Face face = (TT_Face)size->root.face; FT_Memory memory = face->root.memory; TT_Error error; TT_Int i; TT_UShort n_twilight; TT_MaxProfile* maxp = &face->max_profile; TT_ExecContext exec; size->ttmetrics.valid = FALSE; size->max_function_defs = maxp->maxFunctionDefs; size->max_instruction_defs = maxp->maxInstructionDefs; size->num_function_defs = 0; size->num_instruction_defs = 0; size->max_func = 0; size->max_ins = 0; size->cvt_size = face->cvt_size; size->storage_size = maxp->maxStorage; /* Set default metrics */ { FT_Size_Metrics* metrics = &size->root.metrics; TT_Size_Metrics* metrics2 = &size->ttmetrics; metrics->x_ppem = 0; metrics->y_ppem = 0; metrics2->rotated = FALSE; metrics2->stretched = FALSE; /* set default compensation (all 0) */ for ( i = 0; i < 4; i++ ) metrics2->compensations[i] = 0; } /* allocate function defs, instruction defs, cvt and storage area */ if ( ALLOC_ARRAY( size->function_defs, size->max_function_defs, TT_DefRecord ) || ALLOC_ARRAY( size->instruction_defs, size->max_instruction_defs, TT_DefRecord ) || ALLOC_ARRAY( size->cvt, size->cvt_size, TT_Long ) || ALLOC_ARRAY( size->storage, size->storage_size, TT_Long ) ) goto Fail_Memory; /* reserve twilight zone */ n_twilight = maxp->maxTwilightPoints; error = TT_New_GlyphZone( memory, &size->twilight, n_twilight, 0 ); if ( error ) goto Fail_Memory; size->twilight.n_points = n_twilight; /* set `face->interpreter' according to the debug hook present */ { FT_Library library = face->root.driver->library; face->interpreter = (TT_Interpreter) library->debug_hooks[ FT_DEBUG_HOOK_TRUETYPE ]; if (!face->interpreter) face->interpreter = (TT_Interpreter)TT_RunIns; } /* Fine, now execute the font program! */ exec = size->context; if (!size->debug) exec = TT_New_Context( face ); /* size objects used during debugging have their own context */ if ( !exec ) { error = TT_Err_Could_Not_Find_Context; goto Fail_Memory; } size->GS = tt_default_graphics_state; TT_Load_Context( exec, face, size ); exec->callTop = 0; exec->top = 0; exec->period = 64; exec->phase = 0; exec->threshold = 0; { FT_Size_Metrics* metrics = &exec->metrics; TT_Size_Metrics* tt_metrics = &exec->tt_metrics; metrics->x_ppem = 0; metrics->y_ppem = 0; metrics->x_scale = 0; metrics->y_scale = 0; tt_metrics->ppem = 0; tt_metrics->scale = 0; tt_metrics->ratio = 0x10000; } exec->instruction_trap = FALSE; exec->cvtSize = size->cvt_size; exec->cvt = size->cvt; exec->F_dot_P = 0x10000L; /* allow font program execution */ TT_Set_CodeRange( exec, tt_coderange_font, face->font_program, face->font_program_size ); /* disable CVT and glyph programs coderange */ TT_Clear_CodeRange( exec, tt_coderange_cvt ); TT_Clear_CodeRange( exec, tt_coderange_glyph ); if ( face->font_program_size > 0 ) { error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 ); if ( !error ) error = face->interpreter( exec ); if ( error ) goto Fail_Exec; } else error = TT_Err_Ok; TT_Save_Context( exec, size ); if ( !size->debug ) TT_Done_Context( exec ); size->ttmetrics.valid = FALSE; return error; Fail_Exec: if ( !size->debug ) TT_Done_Context( exec ); Fail_Memory: TT_Done_Size( size ); return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_Size */ /* */ /* <Description> */ /* The TrueType size object finalizer. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ LOCAL_FUNC void TT_Done_Size( TT_Size size ) { 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; } FREE( size->cvt ); size->cvt_size = 0; /* free storage area */ FREE( size->storage ); size->storage_size = 0; /* twilight zone */ TT_Done_GlyphZone( memory, &size->twilight ); FREE( size->function_defs ); 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; size->ttmetrics.valid = FALSE; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Reset_Size */ /* */ /* <Description> */ /* Resets a TrueType size when resolutions and character dimensions */ /* have been changed. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ LOCAL_DEF TT_Error TT_Reset_Size( TT_Size size ) { TT_ExecContext exec; TT_Error error; TT_UShort i, j; TT_Face face; FT_Size_Metrics* metrics; if ( size->ttmetrics.valid ) return TT_Err_Ok; face = (TT_Face)size->root.face; metrics = &size->root.metrics; if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 ) return TT_Err_Invalid_PPem; /* 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 = 0x10000; 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 = 0x10000; } /* Compute root ascender, descender, test height, and max_advance */ metrics->ascender = ( FT_MulFix( face->root.ascender, metrics->y_scale ) + 32 ) & -64; metrics->descender = ( FT_MulFix( face->root.descender, metrics->y_scale ) + 32 ) & -64; metrics->height = ( FT_MulFix( face->root.height, metrics->y_scale ) + 32 ) & -64; metrics->max_advance = ( FT_MulFix( face->root.max_advance_width, metrics->x_scale ) + 32 ) & -64; /* 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 ( j = 0; j < size->twilight.n_points; j++ ) { size->twilight.org[j].x = 0; size->twilight.org[j].y = 0; size->twilight.cur[j].x = 0; size->twilight.cur[j].y = 0; } /* clear storage area */ for ( i = 0; i < size->storage_size; i++ ) size->storage[i] = 0; size->GS = tt_default_graphics_state; /* get execution context and run prep program */ if ( size->debug ) exec = size->context; else exec = TT_New_Context( face ); /* debugging instances have their own context */ if ( !exec ) return TT_Err_Could_Not_Find_Context; TT_Load_Context( exec, face, size ); TT_Set_CodeRange( exec, tt_coderange_cvt, face->cvt_program, face->cvt_program_size ); TT_Clear_CodeRange( exec, tt_coderange_glyph ); exec->instruction_trap = FALSE; exec->top = 0; exec->callTop = 0; if ( face->cvt_program_size > 0 ) { error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 ); if ( error ) goto Fin; if ( !size->debug ) error = face->interpreter( exec ); } else error = TT_Err_Ok; size->GS = exec->GS; /* save default graphics state */ Fin: TT_Save_Context( exec, size ); if ( !size->debug ) TT_Done_Context( exec ); /* debugging instances keep their context */ if ( !error ) size->ttmetrics.valid = TRUE; return error; } /*************************************************************************/ /* */ /* <Function> */ /* TT_Init_GlyphSlot */ /* */ /* <Description> */ /* The TrueType glyph slot initializer. */ /* */ /* <Input> */ /* slot :: The glyph record to build. */ /* */ /* <Output> */ /* TrueType error code. 0 means success. */ /* */ LOCAL_FUNC TT_Error TT_Init_GlyphSlot( TT_GlyphSlot slot ) { /* allocate the outline space */ FT_Face face = slot->face; FT_Library library = face->driver->library; FT_TRACE4(( "TT.Init_GlyphSlot: Creating outline maxp = %d, maxc = %d\n", face->max_points, face->max_contours )); return FT_New_Outline( library, face->max_points + 2, face->max_contours, &slot->outline ); } /*************************************************************************/ /* */ /* <Function> */ /* TT_Done_GlyphSlot */ /* */ /* <Description> */ /* The TrueType glyph slot finalizer. */ /* */ /* <Input> */ /* slot :: A handle to the glyph slot object. */ /* */ LOCAL_FUNC void TT_Done_GlyphSlot( TT_GlyphSlot slot ) { FT_Library library = slot->face->driver->library; FT_Done_Outline( library, &slot->outline ); 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 ) { /* init extension registry if needed */ #ifdef TT_CONFIG_OPTION_EXTEND_ENGINE return TT_Init_Extensions( driver ); #else UNUSED( driver ); 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 /* destroy the execution context */ if ( driver->context ) { TT_Destroy_Context( driver->context, driver->root.memory ); driver->context = NULL; } } /* END */