ref: e2dae8fead1a3b2308b650074a7c139a8cf70fb5
dir: /src/bdf/bdfdrivr.c/
/* bdfdrivr.c FreeType font driver for bdf files Copyright (C) 2001-2008, 2011, 2013, 2014 by Francesco Zappa Nardelli Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <ft2build.h> #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_STREAM_H #include FT_INTERNAL_OBJECTS_H #include FT_BDF_H #include FT_TRUETYPE_IDS_H #include FT_SERVICE_BDF_H #include FT_SERVICE_FONT_FORMAT_H #include "bdf.h" #include "bdfdrivr.h" #include "bdferror.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_bdfdriver typedef struct BDF_CMapRec_ { FT_CMapRec cmap; FT_ULong num_encodings; /* ftobjs.h: FT_CMap->clazz->size */ BDF_encoding_el* encodings; } BDF_CMapRec, *BDF_CMap; FT_CALLBACK_DEF( FT_Error ) bdf_cmap_init( FT_CMap bdfcmap, FT_Pointer init_data ) { BDF_CMap cmap = (BDF_CMap)bdfcmap; BDF_Face face = (BDF_Face)FT_CMAP_FACE( cmap ); FT_UNUSED( init_data ); cmap->num_encodings = face->bdffont->glyphs_used; cmap->encodings = face->en_table; return FT_Err_Ok; } FT_CALLBACK_DEF( void ) bdf_cmap_done( FT_CMap bdfcmap ) { BDF_CMap cmap = (BDF_CMap)bdfcmap; cmap->encodings = NULL; cmap->num_encodings = 0; } FT_CALLBACK_DEF( FT_UInt ) bdf_cmap_char_index( FT_CMap bdfcmap, FT_UInt32 charcode ) { BDF_CMap cmap = (BDF_CMap)bdfcmap; BDF_encoding_el* encodings = cmap->encodings; FT_ULong min, max, mid; /* num_encodings */ FT_UShort result = 0; /* encodings->glyph */ 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 ) { /* increase glyph index by 1 -- */ /* we reserve slot 0 for the undefined glyph */ result = encodings[mid].glyph + 1; break; } if ( charcode < code ) max = mid; else min = mid + 1; } return result; } FT_CALLBACK_DEF( FT_UInt ) bdf_cmap_char_next( FT_CMap bdfcmap, FT_UInt32 *acharcode ) { BDF_CMap cmap = (BDF_CMap)bdfcmap; BDF_encoding_el* encodings = cmap->encodings; FT_ULong min, max, mid; /* num_encodings */ FT_UShort result = 0; /* encodings->glyph */ FT_ULong charcode = *acharcode + 1; min = 0; max = cmap->num_encodings; while ( min < max ) { FT_ULong code; /* same as BDF_encoding_el.enc */ mid = ( min + max ) >> 1; code = (FT_ULong)encodings[mid].enc; if ( charcode == code ) { /* increase glyph index by 1 -- */ /* we reserve slot 0 for the undefined glyph */ 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 + 1; } Exit: if ( charcode > 0xFFFFFFFFUL ) { FT_TRACE1(( "bdf_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 bdf_cmap_class = { sizeof ( BDF_CMapRec ), bdf_cmap_init, bdf_cmap_done, bdf_cmap_char_index, bdf_cmap_char_next, NULL, NULL, NULL, NULL, NULL }; static FT_Error bdf_interpret_style( BDF_Face bdf ) { FT_Error error = FT_Err_Ok; FT_Face face = FT_FACE( bdf ); FT_Memory memory = face->memory; bdf_font_t* font = bdf->bdffont; bdf_property_t* prop; char* strings[4] = { NULL, NULL, NULL, NULL }; size_t nn, len, lengths[4]; face->style_flags = 0; prop = bdf_get_font_property( font, (char *)"SLANT" ); if ( prop && prop->format == BDF_ATOM && prop->value.atom && ( *(prop->value.atom) == 'O' || *(prop->value.atom) == 'o' || *(prop->value.atom) == 'I' || *(prop->value.atom) == 'i' ) ) { face->style_flags |= FT_STYLE_FLAG_ITALIC; strings[2] = ( *(prop->value.atom) == 'O' || *(prop->value.atom) == 'o' ) ? (char *)"Oblique" : (char *)"Italic"; } prop = bdf_get_font_property( font, (char *)"WEIGHT_NAME" ); if ( prop && prop->format == BDF_ATOM && prop->value.atom && ( *(prop->value.atom) == 'B' || *(prop->value.atom) == 'b' ) ) { face->style_flags |= FT_STYLE_FLAG_BOLD; strings[1] = (char *)"Bold"; } prop = bdf_get_font_property( font, (char *)"SETWIDTH_NAME" ); if ( prop && prop->format == BDF_ATOM && prop->value.atom && *(prop->value.atom) && !( *(prop->value.atom) == 'N' || *(prop->value.atom) == 'n' ) ) strings[3] = (char *)(prop->value.atom); prop = bdf_get_font_property( font, (char *)"ADD_STYLE_NAME" ); if ( prop && prop->format == BDF_ATOM && prop->value.atom && *(prop->value.atom) && !( *(prop->value.atom) == 'N' || *(prop->value.atom) == 'n' ) ) strings[0] = (char *)(prop->value.atom); for ( len = 0, nn = 0; nn < 4; nn++ ) { lengths[nn] = 0; if ( strings[nn] ) { lengths[nn] = ft_strlen( strings[nn] ); len += lengths[nn] + 1; } } if ( len == 0 ) { strings[0] = (char *)"Regular"; lengths[0] = ft_strlen( strings[0] ); len = lengths[0] + 1; } { char* s; if ( FT_ALLOC( face->style_name, len ) ) return error; s = face->style_name; for ( nn = 0; nn < 4; nn++ ) { char* src = strings[nn]; len = lengths[nn]; if ( src == NULL ) continue; /* separate elements with a space */ if ( s != face->style_name ) *s++ = ' '; ft_memcpy( s, src, len ); /* need to convert spaces to dashes for */ /* add_style_name and setwidth_name */ if ( nn == 0 || nn == 3 ) { size_t mm; for ( mm = 0; mm < len; mm++ ) if ( s[mm] == ' ' ) s[mm] = '-'; } s += len; } *s = 0; } return error; } FT_CALLBACK_DEF( void ) BDF_Face_Done( FT_Face bdfface ) /* BDF_Face */ { BDF_Face face = (BDF_Face)bdfface; FT_Memory memory; if ( !face ) return; memory = FT_FACE_MEMORY( face ); bdf_free_font( face->bdffont ); FT_FREE( face->en_table ); FT_FREE( face->charset_encoding ); FT_FREE( face->charset_registry ); FT_FREE( bdfface->family_name ); FT_FREE( bdfface->style_name ); FT_FREE( bdfface->available_sizes ); FT_FREE( face->bdffont ); } FT_CALLBACK_DEF( FT_Error ) BDF_Face_Init( FT_Stream stream, FT_Face bdfface, /* BDF_Face */ FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error = FT_Err_Ok; BDF_Face face = (BDF_Face)bdfface; FT_Memory memory = FT_FACE_MEMORY( face ); bdf_font_t* font = NULL; bdf_options_t options; FT_UNUSED( num_params ); FT_UNUSED( params ); FT_TRACE2(( "BDF driver\n" )); if ( FT_STREAM_SEEK( 0 ) ) goto Exit; options.correct_metrics = 1; /* FZ XXX: options semantics */ options.keep_unencoded = 1; options.keep_comments = 0; options.font_spacing = BDF_PROPORTIONAL; error = bdf_load_font( stream, memory, &options, &font ); if ( FT_ERR_EQ( error, Missing_Startfont_Field ) ) { FT_TRACE2(( " not a BDF file\n" )); goto Fail; } else if ( error ) goto Exit; /* we have a bdf font: let's construct the face object */ face->bdffont = font; /* BDF could not have multiple face in 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(( "BDF_Face_Init: invalid face index\n" )); BDF_Face_Done( bdfface ); return FT_THROW( Invalid_Argument ); } { bdf_property_t* prop = NULL; FT_TRACE4(( " number of glyphs: allocated %d (used %d)\n", font->glyphs_size, font->glyphs_used )); FT_TRACE4(( " number of unencoded glyphs: allocated %d (used %d)\n", font->unencoded_size, font->unencoded_used )); bdfface->num_faces = 1; bdfface->face_index = 0; bdfface->face_flags |= FT_FACE_FLAG_FIXED_SIZES | FT_FACE_FLAG_HORIZONTAL | FT_FACE_FLAG_FAST_GLYPHS; prop = bdf_get_font_property( font, "SPACING" ); if ( prop && prop->format == BDF_ATOM && prop->value.atom && ( *(prop->value.atom) == 'M' || *(prop->value.atom) == 'm' || *(prop->value.atom) == 'C' || *(prop->value.atom) == 'c' ) ) bdfface->face_flags |= FT_FACE_FLAG_FIXED_WIDTH; /* FZ XXX: TO DO: FT_FACE_FLAGS_VERTICAL */ /* FZ XXX: I need a font to implement this */ prop = bdf_get_font_property( font, "FAMILY_NAME" ); if ( prop && prop->value.atom ) { if ( FT_STRDUP( bdfface->family_name, prop->value.atom ) ) goto Exit; } else bdfface->family_name = NULL; if ( ( error = bdf_interpret_style( face ) ) != 0 ) goto Exit; /* the number of glyphs (with one slot for the undefined glyph */ /* at position 0 and all unencoded glyphs) */ bdfface->num_glyphs = (FT_Long)( font->glyphs_size + 1 ); bdfface->num_fixed_sizes = 1; if ( FT_NEW_ARRAY( bdfface->available_sizes, 1 ) ) goto Exit; { FT_Bitmap_Size* bsize = bdfface->available_sizes; FT_Short resolution_x = 0, resolution_y = 0; FT_MEM_ZERO( bsize, sizeof ( FT_Bitmap_Size ) ); bsize->height = (FT_Short)( font->font_ascent + font->font_descent ); prop = bdf_get_font_property( font, "AVERAGE_WIDTH" ); if ( prop ) bsize->width = (FT_Short)( ( prop->value.l + 5 ) / 10 ); else bsize->width = (FT_Short)( bsize->height * 2/3 ); prop = bdf_get_font_property( font, "POINT_SIZE" ); if ( prop ) /* convert from 722.7 decipoints to 72 points per inch */ bsize->size = (FT_Pos)( ( prop->value.l * 64 * 7200 + 36135L ) / 72270L ); else bsize->size = bsize->width << 6; prop = bdf_get_font_property( font, "PIXEL_SIZE" ); if ( prop ) bsize->y_ppem = (FT_Short)prop->value.l << 6; prop = bdf_get_font_property( font, "RESOLUTION_X" ); if ( prop ) resolution_x = (FT_Short)prop->value.l; prop = bdf_get_font_property( font, "RESOLUTION_Y" ); if ( prop ) resolution_y = (FT_Short)prop->value.l; if ( bsize->y_ppem == 0 ) { bsize->y_ppem = bsize->size; if ( resolution_y ) bsize->y_ppem = bsize->y_ppem * resolution_y / 72; } if ( resolution_x && resolution_y ) bsize->x_ppem = bsize->y_ppem * resolution_x / resolution_y; else bsize->x_ppem = bsize->y_ppem; } /* encoding table */ { bdf_glyph_t* cur = font->glyphs; unsigned long n; if ( FT_NEW_ARRAY( face->en_table, font->glyphs_size ) ) goto Exit; face->default_glyph = 0; for ( n = 0; n < font->glyphs_size; n++ ) { (face->en_table[n]).enc = cur[n].encoding; FT_TRACE4(( " idx %d, val 0x%lX\n", n, cur[n].encoding )); (face->en_table[n]).glyph = (FT_UShort)n; if ( cur[n].encoding == font->default_char ) { if ( n < FT_UINT_MAX ) face->default_glyph = (FT_UInt)n; else FT_TRACE1(( "BDF_Face_Init:" " idx %d is too large for this system\n", n )); } } } /* charmaps */ { bdf_property_t *charset_registry, *charset_encoding; FT_Bool unicode_charmap = 0; charset_registry = bdf_get_font_property( font, "CHARSET_REGISTRY" ); charset_encoding = bdf_get_font_property( font, "CHARSET_ENCODING" ); if ( charset_registry && charset_encoding ) { if ( charset_registry->format == BDF_ATOM && charset_encoding->format == BDF_ATOM && charset_registry->value.atom && charset_encoding->value.atom ) { const char* s; if ( FT_STRDUP( face->charset_encoding, charset_encoding->value.atom ) || FT_STRDUP( face->charset_registry, charset_registry->value.atom ) ) goto Exit; /* Uh, oh, compare first letters manually to avoid dependency */ /* on locales. */ s = face->charset_registry; if ( ( s[0] == 'i' || s[0] == 'I' ) && ( s[1] == 's' || s[1] == 'S' ) && ( s[2] == 'o' || s[2] == 'O' ) ) { s += 3; if ( !ft_strcmp( s, "10646" ) || ( !ft_strcmp( s, "8859" ) && !ft_strcmp( face->charset_encoding, "1" ) ) ) unicode_charmap = 1; } { FT_CharMapRec charmap; 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 ) { charmap.encoding = FT_ENCODING_UNICODE; charmap.platform_id = TT_PLATFORM_MICROSOFT; charmap.encoding_id = TT_MS_ID_UNICODE_CS; } error = FT_CMap_New( &bdf_cmap_class, NULL, &charmap, NULL ); #if 0 /* Select default charmap */ if ( bdfface->num_charmaps ) bdfface->charmap = bdfface->charmaps[0]; #endif } goto Exit; } } /* otherwise assume Adobe standard encoding */ { FT_CharMapRec charmap; charmap.face = FT_FACE( face ); charmap.encoding = FT_ENCODING_ADOBE_STANDARD; charmap.platform_id = TT_PLATFORM_ADOBE; charmap.encoding_id = TT_ADOBE_ID_STANDARD; error = FT_CMap_New( &bdf_cmap_class, NULL, &charmap, NULL ); /* Select default charmap */ if ( bdfface->num_charmaps ) bdfface->charmap = bdfface->charmaps[0]; } } } Exit: return error; Fail: BDF_Face_Done( bdfface ); return FT_THROW( Unknown_File_Format ); } FT_CALLBACK_DEF( FT_Error ) BDF_Size_Select( FT_Size size, FT_ULong strike_index ) { bdf_font_t* bdffont = ( (BDF_Face)size->face )->bdffont; FT_Select_Metrics( size->face, strike_index ); size->metrics.ascender = bdffont->font_ascent * 64; size->metrics.descender = -bdffont->font_descent * 64; size->metrics.max_advance = bdffont->bbx.width * 64; return FT_Err_Ok; } FT_CALLBACK_DEF( FT_Error ) BDF_Size_Request( FT_Size size, FT_Size_Request req ) { FT_Face face = size->face; FT_Bitmap_Size* bsize = face->available_sizes; bdf_font_t* bdffont = ( (BDF_Face)face )->bdffont; 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 == ( bdffont->font_ascent + bdffont->font_descent ) ) error = FT_Err_Ok; break; default: error = FT_THROW( Unimplemented_Feature ); break; } if ( error ) return error; else return BDF_Size_Select( size, 0 ); } FT_CALLBACK_DEF( FT_Error ) BDF_Glyph_Load( FT_GlyphSlot slot, FT_Size size, FT_UInt glyph_index, FT_Int32 load_flags ) { BDF_Face bdf = (BDF_Face)FT_SIZE_FACE( size ); FT_Face face = FT_FACE( bdf ); FT_Error error = FT_Err_Ok; FT_Bitmap* bitmap = &slot->bitmap; bdf_glyph_t glyph; int bpp = bdf->bdffont->bpp; FT_UNUSED( load_flags ); if ( !face ) { error = FT_THROW( Invalid_Face_Handle ); goto Exit; } if ( glyph_index >= (FT_UInt)face->num_glyphs ) { error = FT_THROW( Invalid_Argument ); goto Exit; } FT_TRACE1(( "BDF_Glyph_Load: glyph index %d\n", glyph_index )); /* index 0 is the undefined glyph */ if ( glyph_index == 0 ) glyph_index = bdf->default_glyph; else glyph_index--; /* slot, bitmap => freetype, glyph => bdflib */ glyph = bdf->bdffont->glyphs[glyph_index]; bitmap->rows = glyph.bbx.height; bitmap->width = glyph.bbx.width; if ( glyph.bpr > INT_MAX ) FT_TRACE1(( "BDF_Glyph_Load: too large pitch %d is truncated\n", glyph.bpr )); bitmap->pitch = (int)glyph.bpr; /* same as FT_Bitmap.pitch */ /* note: we don't allocate a new array to hold the bitmap; */ /* we can simply point to it */ ft_glyphslot_set_bitmap( slot, glyph.bitmap ); switch ( bpp ) { case 1: bitmap->pixel_mode = FT_PIXEL_MODE_MONO; break; case 2: bitmap->pixel_mode = FT_PIXEL_MODE_GRAY2; break; case 4: bitmap->pixel_mode = FT_PIXEL_MODE_GRAY4; break; case 8: bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; bitmap->num_grays = 256; break; } slot->format = FT_GLYPH_FORMAT_BITMAP; slot->bitmap_left = glyph.bbx.x_offset; slot->bitmap_top = glyph.bbx.ascent; slot->metrics.horiAdvance = (FT_Pos)( glyph.dwidth * 64 ); slot->metrics.horiBearingX = (FT_Pos)( glyph.bbx.x_offset * 64 ); slot->metrics.horiBearingY = (FT_Pos)( glyph.bbx.ascent * 64 ); slot->metrics.width = (FT_Pos)( bitmap->width * 64 ); slot->metrics.height = (FT_Pos)( bitmap->rows * 64 ); /* * XXX DWIDTH1 and VVECTOR should be parsed and * used here, provided such fonts do exist. */ ft_synthesize_vertical_metrics( &slot->metrics, bdf->bdffont->bbx.height * 64 ); Exit: return error; } /* * * BDF SERVICE * */ static FT_Error bdf_get_bdf_property( BDF_Face face, const char* prop_name, BDF_PropertyRec *aproperty ) { bdf_property_t* prop; FT_ASSERT( face && face->bdffont ); prop = bdf_get_font_property( face->bdffont, prop_name ); if ( prop ) { switch ( prop->format ) { case BDF_ATOM: aproperty->type = BDF_PROPERTY_TYPE_ATOM; aproperty->u.atom = prop->value.atom; break; case BDF_INTEGER: if ( prop->value.l > 0x7FFFFFFFL || prop->value.l < ( -1 - 0x7FFFFFFFL ) ) { FT_TRACE1(( "bdf_get_bdf_property:" " too large integer 0x%x is truncated\n" )); } aproperty->type = BDF_PROPERTY_TYPE_INTEGER; aproperty->u.integer = (FT_Int32)prop->value.l; break; case BDF_CARDINAL: if ( prop->value.ul > 0xFFFFFFFFUL ) { FT_TRACE1(( "bdf_get_bdf_property:" " too large cardinal 0x%x is truncated\n" )); } aproperty->type = BDF_PROPERTY_TYPE_CARDINAL; aproperty->u.cardinal = (FT_UInt32)prop->value.ul; break; default: goto Fail; } return 0; } Fail: return FT_THROW( Invalid_Argument ); } static FT_Error bdf_get_charset_id( BDF_Face face, const char* *acharset_encoding, const char* *acharset_registry ) { *acharset_encoding = face->charset_encoding; *acharset_registry = face->charset_registry; return 0; } static const FT_Service_BDFRec bdf_service_bdf = { (FT_BDF_GetCharsetIdFunc)bdf_get_charset_id, (FT_BDF_GetPropertyFunc) bdf_get_bdf_property }; /* * * SERVICES LIST * */ static const FT_ServiceDescRec bdf_services[] = { { FT_SERVICE_ID_BDF, &bdf_service_bdf }, { FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_BDF }, { NULL, NULL } }; FT_CALLBACK_DEF( FT_Module_Interface ) bdf_driver_requester( FT_Module module, const char* name ) { FT_UNUSED( module ); return ft_service_list_lookup( bdf_services, name ); } FT_CALLBACK_TABLE_DEF const FT_Driver_ClassRec bdf_driver_class = { { FT_MODULE_FONT_DRIVER | FT_MODULE_DRIVER_NO_OUTLINES, sizeof ( FT_DriverRec ), "bdf", 0x10000L, 0x20000L, 0, 0, /* FT_Module_Constructor */ 0, /* FT_Module_Destructor */ bdf_driver_requester }, sizeof ( BDF_FaceRec ), sizeof ( FT_SizeRec ), sizeof ( FT_GlyphSlotRec ), BDF_Face_Init, BDF_Face_Done, 0, /* FT_Size_InitFunc */ 0, /* FT_Size_DoneFunc */ 0, /* FT_Slot_InitFunc */ 0, /* FT_Slot_DoneFunc */ BDF_Glyph_Load, 0, /* FT_Face_GetKerningFunc */ 0, /* FT_Face_AttachFunc */ 0, /* FT_Face_GetAdvancesFunc */ BDF_Size_Request, BDF_Size_Select }; /* END */