diff options
Diffstat (limited to 'src/pfr/pfrobjs.c')
| -rw-r--r-- | src/pfr/pfrobjs.c | 576 |
1 files changed, 576 insertions, 0 deletions
diff --git a/src/pfr/pfrobjs.c b/src/pfr/pfrobjs.c new file mode 100644 index 0000000..180446d --- /dev/null +++ b/src/pfr/pfrobjs.c @@ -0,0 +1,576 @@ +/***************************************************************************/ +/* */ +/* pfrobjs.c */ +/* */ +/* FreeType PFR object methods (body). */ +/* */ +/* Copyright 2002, 2003, 2004, 2005, 2006, 2007 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( FT_Face pfrface ) /* PFR_Face */ + { + PFR_Face face = (PFR_Face)pfrface; + FT_Memory memory = pfrface->driver->root.memory; + + + /* we don't want dangling pointers */ + pfrface->family_name = NULL; + pfrface->style_name = NULL; + + /* 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_FREE( pfrface->available_sizes ); + } + + + FT_LOCAL_DEF( FT_Error ) + pfr_face_init( FT_Stream stream, + FT_Face pfrface, + FT_Int face_index, + FT_Int num_params, + FT_Parameter* params ) + { + PFR_Face face = (PFR_Face)pfrface; + 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; + + pfrface->num_faces = num_faces; + } + + if ( face_index < 0 ) + goto Exit; + + if ( face_index >= pfrface->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 */ + { + PFR_PhyFont phy_font = &face->phy_font; + + + pfrface->face_index = face_index; + pfrface->num_glyphs = phy_font->num_chars + 1; + pfrface->face_flags = FT_FACE_FLAG_SCALABLE; + + /* if all characters point to the same gps_offset 0, we */ + /* assume that the font only contains bitmaps */ + { + FT_UInt nn; + + + for ( nn = 0; nn < phy_font->num_chars; nn++ ) + if ( phy_font->chars[nn].gps_offset != 0 ) + break; + + if ( nn == phy_font->num_chars ) + pfrface->face_flags = 0; /* not scalable */ + } + + if ( (phy_font->flags & PFR_PHY_PROPORTIONAL) == 0 ) + pfrface->face_flags |= FT_FACE_FLAG_FIXED_WIDTH; + + if ( phy_font->flags & PFR_PHY_VERTICAL ) + pfrface->face_flags |= FT_FACE_FLAG_VERTICAL; + else + pfrface->face_flags |= FT_FACE_FLAG_HORIZONTAL; + + if ( phy_font->num_strikes > 0 ) + pfrface->face_flags |= FT_FACE_FLAG_FIXED_SIZES; + + if ( phy_font->num_kern_pairs > 0 ) + pfrface->face_flags |= FT_FACE_FLAG_KERNING; + + /* If no family name was found in the "undocumented" auxiliary + * data, use the font ID instead. This sucks but is better than + * nothing. + */ + pfrface->family_name = phy_font->family_name; + if ( pfrface->family_name == NULL ) + pfrface->family_name = phy_font->font_id; + + /* note that the style name can be NULL in certain PFR fonts, + * probably meaning "Regular" + */ + pfrface->style_name = phy_font->style_name; + + pfrface->num_fixed_sizes = 0; + pfrface->available_sizes = 0; + + pfrface->bbox = phy_font->bbox; + pfrface->units_per_EM = (FT_UShort)phy_font->outline_resolution; + pfrface->ascender = (FT_Short) phy_font->bbox.yMax; + pfrface->descender = (FT_Short) phy_font->bbox.yMin; + + pfrface->height = (FT_Short)( ( pfrface->units_per_EM * 12 ) / 10 ); + if ( pfrface->height < pfrface->ascender - pfrface->descender ) + pfrface->height = (FT_Short)(pfrface->ascender - pfrface->descender); + + if ( phy_font->num_strikes > 0 ) + { + FT_UInt n, count = phy_font->num_strikes; + FT_Bitmap_Size* size; + PFR_Strike strike; + FT_Memory memory = pfrface->stream->memory; + + + if ( FT_NEW_ARRAY( pfrface->available_sizes, count ) ) + goto Exit; + + size = pfrface->available_sizes; + strike = phy_font->strikes; + for ( n = 0; n < count; n++, size++, strike++ ) + { + size->height = (FT_UShort)strike->y_ppm; + size->width = (FT_UShort)strike->x_ppm; + size->size = strike->y_ppm << 6; + size->x_ppem = strike->x_ppm << 6; + size->y_ppem = strike->y_ppm << 6; + } + pfrface->num_fixed_sizes = count; + } + + /* now compute maximum advance width */ + if ( ( phy_font->flags & PFR_PHY_PROPORTIONAL ) == 0 ) + pfrface->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; + } + + pfrface->max_advance_width = (FT_Short)max; + } + + pfrface->max_advance_height = pfrface->height; + + pfrface->underline_position = (FT_Short)( -pfrface->units_per_EM / 10 ); + pfrface->underline_thickness = (FT_Short)( pfrface->units_per_EM / 30 ); + + /* create charmap */ + { + FT_CharMapRec charmap; + + + charmap.face = pfrface; + 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 ( pfrface->num_charmaps ) + pfrface->charmap = pfrface->charmaps[0]; +#endif + } + + /* check whether we've loaded any kerning pairs */ + if ( phy_font->num_kern_pairs ) + pfrface->face_flags |= FT_FACE_FLAG_KERNING; + } + + Exit: + return error; + } + + + /*************************************************************************/ + /*************************************************************************/ + /***** *****/ + /***** SLOT OBJECT METHOD *****/ + /***** *****/ + /*************************************************************************/ + /*************************************************************************/ + + FT_LOCAL_DEF( FT_Error ) + pfr_slot_init( FT_GlyphSlot pfrslot ) /* PFR_Slot */ + { + PFR_Slot slot = (PFR_Slot)pfrslot; + FT_GlyphLoader loader = pfrslot->internal->loader; + + + pfr_glyph_init( &slot->glyph, loader ); + + return 0; + } + + + FT_LOCAL_DEF( void ) + pfr_slot_done( FT_GlyphSlot pfrslot ) /* PFR_Slot */ + { + PFR_Slot slot = (PFR_Slot)pfrslot; + + + pfr_glyph_done( &slot->glyph ); + } + + + FT_LOCAL_DEF( FT_Error ) + pfr_slot_load( FT_GlyphSlot pfrslot, /* PFR_Slot */ + FT_Size pfrsize, /* PFR_Size */ + FT_UInt gindex, + FT_Int32 load_flags ) + { + PFR_Slot slot = (PFR_Slot)pfrslot; + PFR_Size size = (PFR_Size)pfrsize; + FT_Error error; + PFR_Face face = (PFR_Face)pfrslot->face; + PFR_Char gchar; + FT_Outline* outline = &pfrslot->outline; + FT_ULong gps_offset; + + + if ( gindex > 0 ) + gindex--; + + if ( !face || gindex >= face->phy_font.num_chars ) + { + error = PFR_Err_Invalid_Argument; + goto Exit; + } + + /* 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; + } + + if ( load_flags & FT_LOAD_SBITS_ONLY ) + { + error = PFR_Err_Invalid_Argument; + goto Exit; + } + + gchar = face->phy_font.chars + gindex; + pfrslot->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 = &pfrslot->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 && pfrsize->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; + + pfrslot->linearHoriAdvance = metrics->horiAdvance; + pfrslot->linearVertAdvance = metrics->vertAdvance; + + /* make-up vertical metrics(?) */ + metrics->vertBearingX = 0; + metrics->vertBearingY = 0; + +#if 0 /* some fonts seem to be broken here! */ + + /* Apply the font matrix, if any. */ + /* TODO: Test existing fonts with unusual matrix */ + /* whether we have to adjust Units per EM. */ + { + FT_Matrix font_matrix; + + + font_matrix.xx = face->log_font.matrix[0] << 8; + font_matrix.yx = face->log_font.matrix[1] << 8; + font_matrix.xy = face->log_font.matrix[2] << 8; + font_matrix.yy = face->log_font.matrix[3] << 8; + + FT_Outline_Transform( outline, &font_matrix ); + } +#endif + + /* scale when needed */ + if ( scaling ) + { + FT_Int n; + FT_Fixed x_scale = pfrsize->metrics.x_scale; + FT_Fixed y_scale = pfrsize->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( FT_Face pfrface, /* PFR_Face */ + FT_UInt glyph1, + FT_UInt glyph2, + FT_Vector* kerning ) + { + PFR_Face face = (PFR_Face)pfrface; + FT_Error error = PFR_Err_Ok; + PFR_PhyFont phy_font = &face->phy_font; + FT_UInt32 code1, code2, pair; + + + kerning->x = 0; + kerning->y = 0; + + if ( glyph1 > 0 ) + glyph1--; + + if ( glyph2 > 0 ) + glyph2--; + + /* convert glyph indices to character codes */ + if ( glyph1 > phy_font->num_chars || + glyph2 > phy_font->num_chars ) + goto Exit; + + code1 = phy_font->chars[glyph1].char_code; + code2 = phy_font->chars[glyph2].char_code; + pair = PFR_KERN_INDEX( code1, code2 ); + + /* now search the list of kerning items */ + { + PFR_KernItem item = phy_font->kern_items; + FT_Stream stream = pfrface->stream; + + + for ( ; item; item = item->next ) + { + if ( pair >= item->pair1 && pair <= item->pair2 ) + goto FoundPair; + } + goto Exit; + + FoundPair: /* we found an item, now parse it and find the value if any */ + if ( FT_STREAM_SEEK( item->offset ) || + FT_FRAME_ENTER( item->pair_count * item->pair_size ) ) + goto Exit; + + { + FT_UInt count = item->pair_count; + FT_UInt size = item->pair_size; + FT_UInt power = (FT_UInt)ft_highpow2( (FT_UInt32)count ); + FT_UInt probe = power * size; + FT_UInt extra = count - power; + FT_Byte* base = stream->cursor; + FT_Bool twobytes = FT_BOOL( item->flags & 1 ); + FT_Bool twobyte_adj = FT_BOOL( item->flags & 2 ); + FT_Byte* p; + FT_UInt32 cpair; + + + if ( extra > 0 ) + { + p = base + extra * size; + + if ( twobytes ) + cpair = FT_NEXT_ULONG( p ); + else + cpair = PFR_NEXT_KPAIR( p ); + + if ( cpair == pair ) + goto Found; + + if ( cpair < pair ) + { + if ( twobyte_adj ) + p += 2; + else + p++; + base = p; + } + } + + while ( probe > size ) + { + probe >>= 1; + p = base + probe; + + if ( twobytes ) + cpair = FT_NEXT_ULONG( p ); + else + cpair = PFR_NEXT_KPAIR( p ); + + if ( cpair == pair ) + goto Found; + + if ( cpair < pair ) + base += probe; + } + + p = base; + + if ( twobytes ) + cpair = FT_NEXT_ULONG( p ); + else + cpair = PFR_NEXT_KPAIR( p ); + + if ( cpair == pair ) + { + FT_Int value; + + + Found: + if ( twobyte_adj ) + value = FT_PEEK_SHORT( p ); + else + value = p[0]; + + kerning->x = item->base_adj + value; + } + } + + FT_FRAME_EXIT(); + } + + Exit: + return error; + } + +/* END */ |