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|
/****************************************************************************
*
* gfdrivr.c
*
* FreeType font driver for METAFONT GF FONT files
*
* Copyright 1996-2018 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_STREAM_H
#include FT_INTERNAL_OBJECTS_H
#include FT_TRUETYPE_IDS_H
#include FT_INTERNAL_TFM_H
#include FT_SERVICE_GF_H
#include FT_SERVICE_FONT_FORMAT_H
#include "gf.h"
#include "gfdrivr.h"
#include "gferror.h"
/**************************************************************************
*
* 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_gfdriver
typedef struct GF_CMapRec_
{
FT_CMapRec cmap;
FT_ULong num_encodings;
GF_Encoding encodings;
} GF_CMapRec, *GF_CMap;
FT_CALLBACK_DEF( FT_Error )
gf_cmap_init( FT_CMap gfcmap,
FT_Pointer init_data )
{
GF_CMap cmap = (GF_CMap)gfcmap;
GF_Face face = (GF_Face)FT_CMAP_FACE( cmap );
FT_UNUSED( init_data );
cmap->num_encodings = face->gf_glyph->nencodings;
cmap->encodings = face->gf_glyph->encodings;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( void )
gf_cmap_done( FT_CMap gfcmap )
{
GF_CMap cmap = (GF_CMap)gfcmap;
cmap->encodings = NULL;
cmap->num_encodings = 0;
}
FT_CALLBACK_DEF( FT_UInt )
gf_cmap_char_index( FT_CMap gfcmap,
FT_UInt32 charcode )
{
GF_CMap cmap = (GF_CMap)gfcmap;
GF_Encoding encodings = cmap->encodings;
FT_ULong min, max, mid;
FT_UInt result = 0;
min = 0;
max = cmap->num_encodings;
while ( min < max )
{
FT_ULong code;
mid = ( min + max ) >> 1;
code = (FT_ULong)encodings[mid].enc;
if ( charcode == code )
{
result = encodings[mid].glyph;
break;
}
if ( charcode < code )
max = mid;
else
min = mid + 1;
}
return result;
}
FT_CALLBACK_DEF( FT_UInt )
gf_cmap_char_next( FT_CMap gfcmap,
FT_UInt32 *acharcode )
{
GF_CMap cmap = (GF_CMap)gfcmap;
GF_Encoding encodings = cmap->encodings;
FT_ULong min, max, mid;
FT_ULong charcode = *acharcode + 1;
FT_UInt result = 0;
min = 0;
max = cmap->num_encodings;
while ( min < max )
{
FT_ULong code;
mid = ( min + max ) >> 1;
code = (FT_ULong)encodings[mid].enc;
if ( charcode == code )
{
result = encodings[mid].glyph + 1;
goto Exit;
}
if ( charcode < code )
max = mid;
else
min = mid + 1;
}
charcode = 0;
if ( min < cmap->num_encodings )
{
charcode = (FT_ULong)encodings[min].enc;
result = encodings[min].glyph ;
}
Exit:
if ( charcode > 0xFFFFFFFFUL )
{
FT_TRACE1(( "gf_cmap_char_next: charcode 0x%x > 32bit API" ));
*acharcode = 0;
/* XXX: result should be changed to indicate an overflow error */
}
else
*acharcode = (FT_UInt32)charcode;
return result;
}
static
const FT_CMap_ClassRec gf_cmap_class =
{
sizeof ( GF_CMapRec ),
gf_cmap_init,
gf_cmap_done,
gf_cmap_char_index,
gf_cmap_char_next,
NULL, NULL, NULL, NULL, NULL
};
FT_CALLBACK_DEF( void )
GF_Face_Done( FT_Face gfface ) /* GF_Face */
{
GF_Face face = (GF_Face)gfface;
FT_Memory memory;
if ( !face )
return;
memory = FT_FACE_MEMORY( face );
FT_FREE( gfface->available_sizes );
if( face->gf_glyph )
FT_FREE( face->gf_glyph->encodings );
gf_free_font( face );
}
FT_CALLBACK_DEF( FT_Error )
GF_Face_Init( FT_Stream stream,
FT_Face gfface, /* GF_Face */
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
GF_Face face = (GF_Face)gfface;
FT_Error error = FT_Err_Ok;
FT_Memory memory = FT_FACE_MEMORY( face );
GF_Glyph go=NULL;
TFM_Service tfm;
FT_UNUSED( num_params );
FT_UNUSED( params );
face->tfm = FT_Get_Module_Interface( FT_FACE_LIBRARY( face ),
"tfm" );
tfm = (TFM_Service)face->tfm;
if ( !tfm )
{
FT_ERROR(( "GF_Face_Init: cannot access `tfm' module\n" ));
error = FT_THROW( Missing_Module );
goto Exit;
}
FT_TRACE2(( "GF driver\n" ));
/* load font */
error = gf_load_font( stream, memory, &go );
if ( FT_ERR_EQ( error, Unknown_File_Format ) )
{
FT_TRACE2(( " not a GF file\n" ));
goto Fail;
}
else if ( error )
goto Exit;
/* we have a gf font: let's construct the face object */
face->gf_glyph = go;
/* sanity check */
if ( !face->gf_glyph->bm_table )
{
FT_TRACE2(( "glyph bitmaps not allocated\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* GF cannot have multiple faces in a single font file.
* XXX: non-zero face_index is already invalid argument, but
* Type1, Type42 driver has a convention to return
* an invalid argument error when the font could be
* opened by the specified driver.
*/
if ( face_index > 0 && ( face_index & 0xFFFF ) > 0 )
{
FT_ERROR(( "GF_Face_Init: invalid face index\n" ));
GF_Face_Done( gfface );
return FT_THROW( Invalid_Argument );
}
/* we now need to fill the root FT_Face fields */
/* with relevant information */
gfface->num_faces = 1;
gfface->face_index = 0;
gfface->face_flags |= FT_FACE_FLAG_FIXED_SIZES |
FT_FACE_FLAG_HORIZONTAL ;
/*
* XXX: TO-DO: gfface->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
* XXX: I have to check for this.
*/
gfface->family_name = NULL;
gfface->num_glyphs = (FT_Long)go->nglyphs;
FT_TRACE4(( " number of glyphs: allocated %d\n",gfface->num_glyphs ));
if ( gfface->num_glyphs <= 0 )
{
FT_ERROR(( "GF_Face_Init: glyphs not allocated\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
gfface->num_fixed_sizes = 1;
if ( FT_NEW_ARRAY( gfface->available_sizes, 1 ) )
goto Exit;
{
FT_Bitmap_Size* bsize = gfface->available_sizes;
FT_UShort x_res, y_res;
bsize->height = (FT_Short) face->gf_glyph->font_bbx_h ;
bsize->width = (FT_Short) face->gf_glyph->font_bbx_w ;
bsize->size = (FT_Pos) FT_MulDiv( FT_ABS( face->gf_glyph->ds ),
64 * 7200,
72270L );
x_res = toint( go->hppp * 72.27 );
y_res = toint( go->vppp * 72.27 );
bsize->y_ppem = (FT_Pos) toint((face->gf_glyph->ds * y_res)/ 72.27) << 6 ;
bsize->x_ppem = (FT_Pos)FT_MulDiv( bsize->y_ppem,
x_res,
y_res ); ;
}
/* set up charmap */
{
/* FT_Bool unicode_charmap ; */
/*
* XXX: TO-DO
* Currently the unicode_charmap is set to `0'
* The functionality of extracting coding scheme
* from `xxx' and `yyy' commands will be used to
* set the unicode_charmap.
*/
}
/* Charmaps */
{
FT_CharMapRec charmap;
FT_Bool unicode_charmap = 0;
charmap.face = FT_FACE( face );
charmap.encoding = FT_ENCODING_NONE;
/* initial platform/encoding should indicate unset status? */
charmap.platform_id = TT_PLATFORM_APPLE_UNICODE;
charmap.encoding_id = TT_APPLE_ID_DEFAULT;
if( unicode_charmap )
{
/* Unicode Charmap */
charmap.encoding = FT_ENCODING_UNICODE;
charmap.platform_id = TT_PLATFORM_MICROSOFT;
charmap.encoding_id = TT_MS_ID_UNICODE_CS;
}
error = FT_CMap_New( &gf_cmap_class, NULL, &charmap, NULL );
if ( error )
goto Exit;
}
if ( go->code_max < go->code_min )
{
FT_TRACE2(( "invalid number of glyphs\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
Exit:
return error;
Fail:
GF_Face_Done( gfface );
return FT_THROW( Unknown_File_Format );
}
FT_CALLBACK_DEF( FT_Error )
GF_Size_Select( FT_Size size,
FT_ULong strike_index )
{
GF_Face face = (GF_Face)size->face;
GF_Glyph go = face->gf_glyph;
FT_UNUSED( strike_index );
FT_Select_Metrics( size->face, 0 );
size->metrics.ascender = (go->font_bbx_h - go->font_bbx_yoff) * 64;
size->metrics.descender = -go->font_bbx_yoff * 64;
size->metrics.max_advance = go->font_bbx_w * 64;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( FT_Error )
GF_Size_Request( FT_Size size,
FT_Size_Request req )
{
GF_Face face = (GF_Face)size->face;
FT_Bitmap_Size* bsize = size->face->available_sizes;
FT_Error error = FT_ERR( Invalid_Pixel_Size );
FT_Long height;
height = FT_REQUEST_HEIGHT( req );
height = ( height + 32 ) >> 6;
switch ( req->type )
{
case FT_SIZE_REQUEST_TYPE_NOMINAL:
if ( height == ( ( bsize->y_ppem + 32 ) >> 6 ) )
error = FT_Err_Ok;
break;
case FT_SIZE_REQUEST_TYPE_REAL_DIM:
if ( height == face->gf_glyph->font_bbx_h )
error = FT_Err_Ok;
break;
default:
error = FT_THROW( Unimplemented_Feature );
break;
}
if ( error )
return error;
else
return GF_Size_Select( size, 0 );
}
FT_CALLBACK_DEF( FT_Error )
GF_Glyph_Load( FT_GlyphSlot slot,
FT_Size size,
FT_UInt glyph_index,
FT_Int32 load_flags )
{
GF_Face gf = (GF_Face)FT_SIZE_FACE( size );
FT_Face face = FT_FACE( gf );
FT_Error error = FT_Err_Ok;
FT_Bitmap* bitmap = &slot->bitmap;
GF_Bitmap bm;
GF_Glyph go;
go = gf->gf_glyph;
FT_UNUSED( load_flags );
if ( !face )
{
error = FT_THROW( Invalid_Face_Handle );
goto Exit;
}
if ( !go ||
glyph_index >= (FT_UInt)( face->num_glyphs ) )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
FT_TRACE1(( "GF_Glyph_Load: glyph index %d charcode is %d\n", glyph_index, go->bm_table[glyph_index].code ));
if ( (FT_Int)glyph_index < 0 )
glyph_index = 0;
if ( !go->bm_table )
{
FT_TRACE2(( "invalid bitmap table\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* slot, bitmap => freetype, bm => gflib */
bm = &gf->gf_glyph->bm_table[glyph_index];
bitmap->rows = bm->bbx_height;
bitmap->width = bm->bbx_width;
bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
if ( !bm->raster )
{
FT_TRACE2(( "invalid bitmap width\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
bitmap->pitch = (int)bm->raster ;
/* note: we don't allocate a new array to hold the bitmap; */
/* we can simply point to it */
ft_glyphslot_set_bitmap( slot, bm->bitmap );
slot->format = FT_GLYPH_FORMAT_BITMAP;
slot->bitmap_left = bm->off_x ;
slot->bitmap_top = bm->off_y ;
slot->metrics.horiAdvance = (FT_Pos) (bm->mv_x ) * 64;
slot->metrics.horiBearingX = (FT_Pos) (bm->off_x ) * 64;
slot->metrics.horiBearingY = (FT_Pos) (bm->bbx_height) * 64;
slot->metrics.width = (FT_Pos) ( bitmap->width * 64 );
slot->metrics.height = (FT_Pos) ( bitmap->rows * 64 );
FT_TRACE2(( "Glyph metric values are: bm->bbx_height is %ld\n"
" bm->bbx_width is %ld\n"
" bm->off_x is %ld\n"
" bm->off_y is %ld\n"
" bm->mv_x is %ld\n"
" bm->mv_y is %ld\n", bm->bbx_height, bm->bbx_width,
bm->off_x, bm->off_y, bm->mv_x,
bm->mv_y ));
ft_synthesize_vertical_metrics( &slot->metrics, bm->bbx_height * 64 );
Exit:
return error;
}
FT_LOCAL_DEF( void )
TFM_Done_Metrics( FT_Memory memory,
TFM_FontInfo fi )
{
FT_FREE(fi->width);
FT_FREE(fi->height);
FT_FREE(fi->depth);
FT_FREE( fi );
}
/* parse a TFM metrics file */
FT_LOCAL_DEF( FT_Error )
TFM_Read_Metrics( FT_Face gf_face,
FT_Stream stream )
{
TFM_Service tfm;
FT_Memory memory = stream->memory;
TFM_ParserRec parser;
TFM_FontInfo fi = NULL;
FT_Error error = FT_ERR( Unknown_File_Format );
GF_Face face = (GF_Face)gf_face;
GF_Glyph gf_glyph= face->gf_glyph;
if ( face->tfm_data )
{
FT_TRACE1(( "TFM_Read_Metrics:"
" Freeing previously attached metrics data.\n" ));
TFM_Done_Metrics( memory, (TFM_FontInfo)face->tfm_data );
face->tfm_data = NULL;
}
if ( FT_NEW( fi ) )
goto Exit;
FT_TRACE4(( "TFM_Read_Metrics: Invoking TFM_Service.\n" ));
tfm = (TFM_Service)face->tfm;
if ( tfm->tfm_parser_funcs )
{
/* Initialise TFM Service */
error = tfm->tfm_parser_funcs->init( &parser,
memory,
stream );
if ( !error )
{
FT_TRACE4(( "TFM_Read_Metrics: Initialised tfm metric data.\n" ));
parser.FontInfo = fi;
parser.user_data = gf_glyph;
error = tfm->tfm_parser_funcs->parse_metrics( &parser );
if( !error )
FT_TRACE4(( "TFM_Read_Metrics: parsing TFM metric information done.\n" ));
FT_TRACE6(( "TFM_Read_Metrics: TFM Metric Information:\n"
" Check Sum : %ld\n"
" Design Size: %ld\n"
" Begin Char : %d\n"
" End Char : %d\n"
" font_bbx_w : %d\n"
" font_bbx_h : %d\n"
" slant : %d\n", parser.FontInfo->cs, parser.FontInfo->design_size, parser.FontInfo->begin_char,
parser.FontInfo->end_char, parser.FontInfo->font_bbx_w,
parser.FontInfo->font_bbx_h, parser.FontInfo->slant ));
tfm->tfm_parser_funcs->done( &parser );
}
}
if ( !error )
{
/* Modify GF_Glyph data according to TFM metric values */
/*
face->gf_glyph->font_bbx_w = fi->font_bbx_w;
face->gf_glyph->font_bbx_h = fi->font_bbx_h;
*/
face->tfm_data = fi;
}
Exit:
if ( fi )
TFM_Done_Metrics( memory, fi );
return error;
}
/*
*
* SERVICES LIST
*
*/
static const FT_ServiceDescRec gf_services[] =
{
{ FT_SERVICE_ID_GF, NULL },
{ FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_GF },
{ NULL, NULL }
};
FT_CALLBACK_DEF( FT_Module_Interface )
gf_driver_requester( FT_Module module,
const char* name )
{
FT_UNUSED( module );
return ft_service_list_lookup( gf_services, name );
}
FT_CALLBACK_TABLE_DEF
const FT_Driver_ClassRec gf_driver_class =
{
{
FT_MODULE_FONT_DRIVER |
FT_MODULE_DRIVER_NO_OUTLINES,
sizeof ( FT_DriverRec ),
"gf",
0x10000L,
0x20000L,
NULL, /* module-specific interface */
NULL, /* FT_Module_Constructor module_init */
NULL, /* FT_Module_Destructor module_done */
gf_driver_requester /* FT_Module_Requester get_interface */
},
sizeof ( GF_FaceRec ),
sizeof ( FT_SizeRec ),
sizeof ( FT_GlyphSlotRec ),
GF_Face_Init, /* FT_Face_InitFunc init_face */
GF_Face_Done, /* FT_Face_DoneFunc done_face */
NULL, /* FT_Size_InitFunc init_size */
NULL, /* FT_Size_DoneFunc done_size */
NULL, /* FT_Slot_InitFunc init_slot */
NULL, /* FT_Slot_DoneFunc done_slot */
GF_Glyph_Load, /* FT_Slot_LoadFunc load_glyph */
NULL, /* FT_Face_GetKerningFunc get_kerning */
TFM_Read_Metrics, /* FT_Face_AttachFunc attach_file */
NULL, /* FT_Face_GetAdvancesFunc get_advances */
GF_Size_Request, /* FT_Size_RequestFunc request_size */
GF_Size_Select /* FT_Size_SelectFunc select_size */
};
/* END */
|