kc3-lang/freetype/src/truetype/ttobjs.c
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Hash : 14018b4a
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Date : 2003-01-12T18:26:10
2003-01-11 David Chester <davidchester@qmx.net> * include/freetype/config/ftoption.h, src/autohint/ahglobal.h, src/autohint/ahglobal.c, src/autohint/ahglyph.c, src/autohint/ahtypes.h: included David Chester's patches to the auto-hinter in order to slightly improve the output. Note that everything is controlled through the new FT_CONFIG_OPTION_CHESTER_HINTS defined at the end of "ftoption.h", there are also individual FT_CONFIG_CHESTER_XXX macros to control individual "features". Note that all improvements are enabled by default, but can be tweaked for optimization and testing purpose. The configuration macros will most likely disappear in the short future. 2003-01-11 David Turner <david@freetype.org> * include/freetype/internal/fnttypes.h: fixed a structure field definition to avoid memory overwrites
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src/truetype/ttobjs.c
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/***************************************************************************/ /* */ /* ttobjs.c */ /* */ /* Objects manager (body). */ /* */ /* Copyright 1996-2001, 2002 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 <ft2build.h> #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_CALC_H #include FT_INTERNAL_STREAM_H #include FT_TRUETYPE_IDS_H #include FT_TRUETYPE_TAGS_H #include FT_INTERNAL_SFNT_H #include FT_INTERNAL_POSTSCRIPT_NAMES_H #include "ttgload.h" #include "ttpload.h" #include "tterrors.h" #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER #include "ttinterp.h" #endif /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_ttobjs #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER /*************************************************************************/ /* */ /* GLYPH ZONE FUNCTIONS */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* tt_glyphzone_done */ /* */ /* <Description> */ /* Deallocates a glyph zone. */ /* */ /* <Input> */ /* zone :: A pointer to the target glyph zone. */ /* */ FT_LOCAL_DEF( void ) tt_glyphzone_done( TT_GlyphZone zone ) { FT_Memory memory = zone->memory; FT_FREE( zone->contours ); FT_FREE( zone->tags ); FT_FREE( zone->cur ); FT_FREE( zone->org ); zone->max_points = zone->n_points = 0; zone->max_contours = zone->n_contours = 0; } /*************************************************************************/ /* */ /* <Function> */ /* tt_glyphzone_new */ /* */ /* <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. */ /* */ /* <Output> */ /* zone :: A pointer to the target glyph zone record. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_glyphzone_new( FT_Memory memory, FT_UShort maxPoints, FT_Short maxContours, TT_GlyphZone zone ) { FT_Error error; if ( maxPoints > 0 ) maxPoints += 2; FT_MEM_ZERO( zone, sizeof ( *zone ) ); zone->memory = memory; if ( FT_NEW_ARRAY( zone->org, maxPoints * 2 ) || FT_NEW_ARRAY( zone->cur, maxPoints * 2 ) || FT_NEW_ARRAY( zone->tags, maxPoints ) || FT_NEW_ARRAY( zone->contours, maxContours ) ) { tt_glyphzone_done( zone ); } return error; } #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ /*************************************************************************/ /* */ /* <Function> */ /* tt_face_init */ /* */ /* <Description> */ /* Initializes a given TrueType face object. */ /* */ /* <Input> */ /* stream :: The source font stream. */ /* */ /* face_index :: The index of the font face in the resource. */ /* */ /* num_params :: Number of additional generic parameters. Ignored. */ /* */ /* params :: Additional generic parameters. Ignored. */ /* */ /* <InOut> */ /* face :: The newly built face object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_face_init( FT_Stream stream, TT_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; FT_Library library; SFNT_Service sfnt; library = face->root.driver->root.library; sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" ); if ( !sfnt ) goto Bad_Format; /* create input stream from resource */ if ( FT_STREAM_SEEK( 0 ) ) goto Exit; /* check that we have a valid TrueType file */ error = sfnt->init_face( stream, face, face_index, num_params, params ); if ( error ) goto Exit; /* We must also be able to accept Mac/GX fonts, as well as OT ones */ if ( face->format_tag != 0x00010000L && /* MS fonts */ face->format_tag != TTAG_true ) /* Mac fonts */ { FT_TRACE2(( "[not a valid TTF font]\n" )); goto Bad_Format; } /* If we are performing a simple font format check, exit immediately */ if ( face_index < 0 ) return TT_Err_Ok; /* Load font directory */ error = sfnt->load_face( stream, face, face_index, num_params, params ); if ( error ) goto Exit; if ( face->root.face_flags & FT_FACE_FLAG_SCALABLE ) { #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( !face->root.internal->incremental_interface ) error = tt_face_load_loca( face, stream ); if ( !error ) error = tt_face_load_cvt ( face, stream ) || tt_face_load_fpgm ( face, stream ); #else if ( !error ) error = tt_face_load_loca( face, stream ) || tt_face_load_cvt ( face, stream ) || tt_face_load_fpgm ( face, stream ); #endif } /* initialize standard glyph loading routines */ TT_Init_Glyph_Loading( face ); Exit: return error; Bad_Format: error = TT_Err_Unknown_File_Format; goto Exit; } /*************************************************************************/ /* */ /* <Function> */ /* tt_face_done */ /* */ /* <Description> */ /* Finalizes a given face object. */ /* */ /* <Input> */ /* face :: A pointer to the face object to destroy. */ /* */ FT_LOCAL_DEF( void ) tt_face_done( TT_Face face ) { FT_Memory memory = face->root.memory; FT_Stream stream = face->root.stream; SFNT_Service sfnt = (SFNT_Service)face->sfnt; /* for `extended TrueType formats' (i.e. compressed versions) */ if ( face->extra.finalizer ) face->extra.finalizer( face->extra.data ); if ( sfnt ) sfnt->done_face( face ); /* freeing the locations table */ FT_FREE( face->glyph_locations ); face->num_locations = 0; /* freeing the CVT */ FT_FREE( face->cvt ); face->cvt_size = 0; /* freeing the programs */ FT_FRAME_RELEASE( face->font_program ); FT_FRAME_RELEASE( face->cvt_program ); face->font_program_size = 0; face->cvt_program_size = 0; } /*************************************************************************/ /* */ /* SIZE FUNCTIONS */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* tt_size_init */ /* */ /* <Description> */ /* Initializes a new TrueType size object. */ /* */ /* <InOut> */ /* size :: A handle to the size object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_size_init( TT_Size size ) { FT_Error error = TT_Err_Ok; #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER TT_Face face = (TT_Face)size->root.face; FT_Memory memory = face->root.memory; FT_Int i; TT_ExecContext exec; FT_UShort n_twilight; TT_MaxProfile* maxp = &face->max_profile; 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 ( FT_NEW_ARRAY( size->function_defs, size->max_function_defs ) || FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) || FT_NEW_ARRAY( size->cvt, size->cvt_size ) || FT_NEW_ARRAY( size->storage, size->storage_size ) ) goto Fail_Memory; /* reserve twilight zone */ n_twilight = maxp->maxTwilightPoints; error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight ); 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->root.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; /* size objects used during debugging have their own context */ if ( !size->debug ) exec = TT_New_Context( face ); 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 = 0x10000L; } 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 ); #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ size->ttmetrics.valid = FALSE; return error; #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER Fail_Exec: if ( !size->debug ) TT_Done_Context( exec ); Fail_Memory: tt_size_done( size ); return error; #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ } /*************************************************************************/ /* */ /* <Function> */ /* tt_size_done */ /* */ /* <Description> */ /* The TrueType size object finalizer. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ FT_LOCAL_DEF( void ) tt_size_done( TT_Size size ) { #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER FT_Memory memory = size->root.face->memory; if ( size->debug ) { /* the debug context must be deleted by the debugger itself */ size->context = NULL; size->debug = FALSE; } FT_FREE( size->cvt ); size->cvt_size = 0; /* free storage area */ FT_FREE( size->storage ); size->storage_size = 0; /* twilight zone */ tt_glyphzone_done( &size->twilight ); FT_FREE( size->function_defs ); FT_FREE( size->instruction_defs ); size->num_function_defs = 0; size->max_function_defs = 0; size->num_instruction_defs = 0; size->max_instruction_defs = 0; size->max_func = 0; size->max_ins = 0; #endif size->ttmetrics.valid = FALSE; } /*************************************************************************/ /* */ /* <Function> */ /* Reset_Outline_Size */ /* */ /* <Description> */ /* Resets a TrueType outline size when resolutions and character */ /* dimensions have been changed. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ static FT_Error Reset_Outline_Size( TT_Size size ) { TT_Face face; FT_Error error = TT_Err_Ok; 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 = 0x10000L; size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem, 0x10000L, metrics->x_ppem ); } else { size->ttmetrics.scale = metrics->y_scale; size->ttmetrics.ppem = metrics->y_ppem; size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem, 0x10000L, metrics->y_ppem ); size->ttmetrics.y_ratio = 0x10000L; } #ifdef FT_CONFIG_CHESTER_ASCENDER /* Compute root ascender, descender, test height, and max_advance */ metrics->ascender = ( FT_MulFix( face->root.ascender, metrics->y_scale ) + 63 ) & -64; metrics->descender = ( FT_MulFix( face->root.descender, metrics->y_scale ) + 0 ) & -64; #else /* !CHESTER_ASCENDER */ /* 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; #endif /* !CHESTER_ASCENDER */ 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; #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS /* set to `invalid' by default */ size->strike_index = 0xFFFFU; #endif #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER { TT_ExecContext exec; FT_UInt i, j; /* 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 < (FT_UInt)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 < (FT_UInt)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 End; if ( !size->debug ) error = face->interpreter( exec ); } else error = TT_Err_Ok; size->GS = exec->GS; /* save default graphics state */ End: TT_Save_Context( exec, size ); if ( !size->debug ) TT_Done_Context( exec ); /* debugging instances keep their context */ } #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ if ( !error ) size->ttmetrics.valid = TRUE; return error; } #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS /*************************************************************************/ /* */ /* <Function> */ /* Reset_SBit_Size */ /* */ /* <Description> */ /* Resets a TrueType sbit size when resolutions and character */ /* dimensions have been changed. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ static FT_Error Reset_SBit_Size( TT_Size size ) { TT_Face face; FT_Error error = TT_Err_Ok; FT_ULong strike_index; FT_Size_Metrics* metrics; FT_Size_Metrics* sbit_metrics; SFNT_Service sfnt; metrics = &size->root.metrics; if ( size->strike_index != 0xFFFFU ) return TT_Err_Ok; face = (TT_Face)size->root.face; sfnt = (SFNT_Service)face->sfnt; sbit_metrics = &size->strike_metrics; error = sfnt->set_sbit_strike(face, metrics->x_ppem, metrics->y_ppem, &strike_index); if ( !error ) { TT_SBit_Strike strike = face->sbit_strikes + strike_index; sbit_metrics->x_ppem = metrics->x_ppem; sbit_metrics->y_ppem = metrics->y_ppem; #if 0 /* * sbit_metrics->?_scale * are not used now. */ sbit_metrics->x_scale = 1 << 16; sbit_metrics->y_scale = 1 << 16; #endif sbit_metrics->ascender = strike->hori.ascender << 6; sbit_metrics->descender = strike->hori.descender << 6; /* XXX: Is this correct? */ sbit_metrics->height = sbit_metrics->ascender - sbit_metrics->descender; /* XXX: Is this correct? */ sbit_metrics->max_advance = ( strike->hori.min_origin_SB + strike->hori.max_width + strike->hori.min_advance_SB ) << 6; size->strike_index = strike_index; } else { size->strike_index = 0xFFFFU; sbit_metrics->x_ppem = 0; sbit_metrics->y_ppem = 0; sbit_metrics->ascender = 0; sbit_metrics->descender = 0; sbit_metrics->height = 0; sbit_metrics->max_advance = 0; } return error; } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ /*************************************************************************/ /* */ /* <Function> */ /* tt_size_reset */ /* */ /* <Description> */ /* Resets a TrueType size when resolutions and character dimensions */ /* have been changed. */ /* */ /* <Input> */ /* size :: A handle to the target size object. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_size_reset( TT_Size size ) { FT_Face face; FT_Error error = TT_Err_Ok; face = size->root.face; if ( face->face_flags & FT_FACE_FLAG_SCALABLE ) { if ( !size->ttmetrics.valid ) error = Reset_Outline_Size( size ); if ( error ) return error; } #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS if ( face->face_flags & FT_FACE_FLAG_FIXED_SIZES ) { if ( size->strike_index == 0xFFFFU ) error = Reset_SBit_Size( size ); if ( !error && !( face->face_flags & FT_FACE_FLAG_SCALABLE ) ) size->root.metrics = size->strike_metrics; } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ if ( face->face_flags & FT_FACE_FLAG_SCALABLE ) return TT_Err_Ok; else return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_driver_init */ /* */ /* <Description> */ /* Initializes a given TrueType driver object. */ /* */ /* <Input> */ /* driver :: A handle to the target driver object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_LOCAL_DEF( FT_Error ) tt_driver_init( TT_Driver driver ) { FT_Error error; /* set `extra' in glyph loader */ error = FT_GlyphLoader_CreateExtra( FT_DRIVER( driver )->glyph_loader ); return error; } /*************************************************************************/ /* */ /* <Function> */ /* tt_driver_done */ /* */ /* <Description> */ /* Finalizes a given TrueType driver. */ /* */ /* <Input> */ /* driver :: A handle to the target TrueType driver. */ /* */ FT_LOCAL_DEF( void ) tt_driver_done( TT_Driver driver ) { #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER /* destroy the execution context */ if ( driver->context ) { TT_Destroy_Context( driver->context, driver->root.root.memory ); driver->context = NULL; } #else FT_UNUSED( driver ); #endif } /* END */