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freetype2/src/truetype/ttobjs.c

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Initial revision
1999-12-17 00:11:37 +01:00
/***************************************************************************/
/* */
/* 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 &&
fixed a bug which caused some font family and style names to be incorrectly ignored..
2000-01-13 19:19:51 +01:00
rec->encodingID <= TT_MS_ID_UNICODE_CS &&
Initial revision
1999-12-17 00:11:37 +01:00
(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 */