ref: d0ab3a0dd8f6355b3603d0fb04043a9ae867639b
dir: /libfreetype/pfrobjs.c/
/***************************************************************************/ /* */ /* pfrobjs.c */ /* */ /* FreeType PFR object methods (body). */ /* */ /* Copyright 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 "pfrobjs.h" #include "pfrload.h" #include "pfrgload.h" #include "pfrcmap.h" #include "pfrsbit.h" #include FT_OUTLINE_H #include FT_INTERNAL_DEBUG_H #include "pfrerror.h" #undef FT_COMPONENT #define FT_COMPONENT trace_pfr /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** FACE OBJECT METHODS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF( void ) pfr_face_done( PFR_Face face ) { /* finalize the physical font record */ pfr_phy_font_done( &face->phy_font, FT_FACE_MEMORY( face ) ); /* no need to finalize the logical font or the header */ } FT_LOCAL_DEF( FT_Error ) pfr_face_init( FT_Stream stream, PFR_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; FT_UNUSED( num_params ); FT_UNUSED( params ); /* load the header and check it */ error = pfr_header_load( &face->header, stream ); if ( error ) goto Exit; if ( !pfr_header_check( &face->header ) ) { FT_TRACE4(( "pfr_face_init: not a valid PFR font\n" )); error = PFR_Err_Unknown_File_Format; goto Exit; } /* check face index */ { FT_UInt num_faces; error = pfr_log_font_count( stream, face->header.log_dir_offset, &num_faces ); if ( error ) goto Exit; face->root.num_faces = num_faces; } if ( face_index < 0 ) goto Exit; if ( face_index >= face->root.num_faces ) { FT_ERROR(( "pfr_face_init: invalid face index\n" )); error = PFR_Err_Invalid_Argument; goto Exit; } /* load the face */ error = pfr_log_font_load( &face->log_font, stream, face_index, face->header.log_dir_offset, FT_BOOL( face->header.phy_font_max_size_high != 0 ) ); if ( error ) goto Exit; /* now load the physical font descriptor */ error = pfr_phy_font_load( &face->phy_font, stream, face->log_font.phys_offset, face->log_font.phys_size ); if ( error ) goto Exit; /* now, set-up all root face fields */ { FT_Face root = FT_FACE( face ); PFR_PhyFont phy_font = &face->phy_font; root->face_index = face_index; root->num_glyphs = phy_font->num_chars; root->face_flags = FT_FACE_FLAG_SCALABLE; if ( (phy_font->flags & PFR_PHY_PROPORTIONAL) == 0 ) root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH; if ( phy_font->flags & PFR_PHY_VERTICAL ) root->face_flags |= FT_FACE_FLAG_VERTICAL; else root->face_flags |= FT_FACE_FLAG_HORIZONTAL; if ( phy_font->num_strikes > 0 ) root->face_flags |= FT_FACE_FLAG_FIXED_SIZES; if ( phy_font->num_kern_pairs > 0 ) root->face_flags |= FT_FACE_FLAG_KERNING; root->family_name = phy_font->font_id; root->style_name = NULL; /* no style name in font file */ root->num_fixed_sizes = 0; root->available_sizes = 0; root->bbox = phy_font->bbox; root->units_per_EM = (FT_UShort)phy_font->outline_resolution; root->ascender = (FT_Short) phy_font->bbox.yMax; root->descender = (FT_Short) phy_font->bbox.yMin; root->height = (FT_Short) ( ( ( root->ascender - root->descender ) * 12 ) / 10 ); /* now compute maximum advance width */ if ( ( phy_font->flags & PFR_PHY_PROPORTIONAL ) == 0 ) root->max_advance_width = (FT_Short)phy_font->standard_advance; else { FT_Int max = 0; FT_UInt count = phy_font->num_chars; PFR_Char gchar = phy_font->chars; for ( ; count > 0; count--, gchar++ ) { if ( max < gchar->advance ) max = gchar->advance; } root->max_advance_width = (FT_Short)max; } root->max_advance_height = root->height; root->underline_position = (FT_Short)( - root->units_per_EM / 10 ); root->underline_thickness = (FT_Short)( root->units_per_EM / 30 ); /* create charmap */ { FT_CharMapRec charmap; charmap.face = root; charmap.platform_id = 3; charmap.encoding_id = 1; charmap.encoding = FT_ENCODING_UNICODE; FT_CMap_New( &pfr_cmap_class_rec, NULL, &charmap, NULL ); #if 0 /* Select default charmap */ if (root->num_charmaps) root->charmap = root->charmaps[0]; #endif } /* check whether we've loaded any kerning pairs */ if ( phy_font->num_kern_pairs ) root->face_flags |= FT_FACE_FLAG_KERNING; } Exit: return error; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** SLOT OBJECT METHOD *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF( FT_Error ) pfr_slot_init( PFR_Slot slot ) { FT_GlyphLoader loader = slot->root.internal->loader; pfr_glyph_init( &slot->glyph, loader ); return 0; } FT_LOCAL_DEF( void ) pfr_slot_done( PFR_Slot slot ) { pfr_glyph_done( &slot->glyph ); } FT_LOCAL_DEF( FT_Error ) pfr_slot_load( PFR_Slot slot, PFR_Size size, FT_UInt gindex, FT_Int32 load_flags ) { FT_Error error; PFR_Face face = (PFR_Face)slot->root.face; PFR_Char gchar; FT_Outline* outline = &slot->root.outline; FT_ULong gps_offset; if (gindex > 0) gindex--; /* check that the glyph index is correct */ FT_ASSERT( gindex < face->phy_font.num_chars ); /* try to load an embedded bitmap */ if ( ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP ) ) == 0 ) { error = pfr_slot_load_bitmap( slot, size, gindex ); if ( error == 0 ) goto Exit; } gchar = face->phy_font.chars + gindex; slot->root.format = FT_GLYPH_FORMAT_OUTLINE; outline->n_points = 0; outline->n_contours = 0; gps_offset = face->header.gps_section_offset; /* load the glyph outline (FT_LOAD_NO_RECURSE isn't supported) */ error = pfr_glyph_load( &slot->glyph, face->root.stream, gps_offset, gchar->gps_offset, gchar->gps_size ); if ( !error ) { FT_BBox cbox; FT_Glyph_Metrics* metrics = &slot->root.metrics; FT_Pos advance; FT_Int em_metrics, em_outline; FT_Bool scaling; scaling = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 ); /* copy outline data */ *outline = slot->glyph.loader->base.outline; outline->flags &= ~FT_OUTLINE_OWNER; outline->flags |= FT_OUTLINE_REVERSE_FILL; if ( size && size->root.metrics.y_ppem < 24 ) outline->flags |= FT_OUTLINE_HIGH_PRECISION; /* compute the advance vector */ metrics->horiAdvance = 0; metrics->vertAdvance = 0; advance = gchar->advance; em_metrics = face->phy_font.metrics_resolution; em_outline = face->phy_font.outline_resolution; if ( em_metrics != em_outline ) advance = FT_MulDiv( advance, em_outline, em_metrics ); if ( face->phy_font.flags & PFR_PHY_VERTICAL ) metrics->vertAdvance = advance; else metrics->horiAdvance = advance; slot->root.linearHoriAdvance = metrics->horiAdvance; slot->root.linearVertAdvance = metrics->vertAdvance; /* make-up vertical metrics(?) */ metrics->vertBearingX = 0; metrics->vertBearingY = 0; /* scale when needed */ if ( scaling ) { FT_Int n; FT_Fixed x_scale = size->root.metrics.x_scale; FT_Fixed y_scale = size->root.metrics.y_scale; FT_Vector* vec = outline->points; /* scale outline points */ for ( n = 0; n < outline->n_points; n++, vec++ ) { vec->x = FT_MulFix( vec->x, x_scale ); vec->y = FT_MulFix( vec->y, y_scale ); } /* scale the advance */ metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); } /* compute the rest of the metrics */ FT_Outline_Get_CBox( outline, &cbox ); metrics->width = cbox.xMax - cbox.xMin; metrics->height = cbox.yMax - cbox.yMin; metrics->horiBearingX = cbox.xMin; metrics->horiBearingY = cbox.yMax - metrics->height; } Exit: return error; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** KERNING METHOD *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF( FT_Error ) pfr_face_get_kerning( PFR_Face face, FT_UInt glyph1, FT_UInt glyph2, FT_Vector* kerning ) { FT_Error error; PFR_PhyFont phy_font = &face->phy_font; PFR_KernItem item = phy_font->kern_items; FT_UInt32 idx = PFR_KERN_INDEX( glyph1, glyph2 ); kerning->x = 0; kerning->y = 0; /* find the kerning item containing our pair */ while ( item ) { if ( item->pair1 <= idx && idx <= item->pair2 ) goto Found_Item; item = item->next; } /* not found */ goto Exit; Found_Item: { /* perform simply binary search within the item */ FT_UInt min, mid, max; FT_Stream stream = face->root.stream; FT_Byte* p; if ( FT_STREAM_SEEK( item->offset ) || FT_FRAME_ENTER( item->pair_count * item->pair_size ) ) goto Exit; min = 0; max = item->pair_count; while ( min < max ) { FT_UInt char1, char2, charcode; mid = ( min + max ) >> 1; p = stream->cursor + mid*item->pair_size; if ( item->flags & PFR_KERN_2BYTE_CHAR ) { char1 = FT_NEXT_USHORT( p ); char2 = FT_NEXT_USHORT( p ); } else { char1 = FT_NEXT_USHORT( p ); char2 = FT_NEXT_USHORT( p ); } charcode = PFR_KERN_INDEX( char1, char2 ); if ( idx == charcode ) { if ( item->flags & PFR_KERN_2BYTE_ADJ ) kerning->x = item->base_adj + FT_NEXT_SHORT( p ); else kerning->x = item->base_adj + FT_NEXT_CHAR( p ); break; } if ( idx > charcode ) min = mid + 1; else max = mid; } FT_FRAME_EXIT(); } Exit: return 0; } /* END */