| /***************************************************************************/ |
| /* */ |
| /* ttgload.c */ |
| /* */ |
| /* TrueType Glyph Loader (body). */ |
| /* */ |
| /* Copyright 1996-2001, 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 <ft2build.h> |
| #include FT_INTERNAL_DEBUG_H |
| #include FT_INTERNAL_CALC_H |
| #include FT_INTERNAL_STREAM_H |
| #include FT_INTERNAL_SFNT_H |
| #include FT_TRUETYPE_TAGS_H |
| #include FT_OUTLINE_H |
| |
| #include "ttgload.h" |
| |
| #include "tterrors.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_ttgload |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Composite font flags. */ |
| /* */ |
| #define ARGS_ARE_WORDS 0x001 |
| #define ARGS_ARE_XY_VALUES 0x002 |
| #define ROUND_XY_TO_GRID 0x004 |
| #define WE_HAVE_A_SCALE 0x008 |
| /* reserved 0x010 */ |
| #define MORE_COMPONENTS 0x020 |
| #define WE_HAVE_AN_XY_SCALE 0x040 |
| #define WE_HAVE_A_2X2 0x080 |
| #define WE_HAVE_INSTR 0x100 |
| #define USE_MY_METRICS 0x200 |
| |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* TT_Get_Metrics */ |
| /* */ |
| /* <Description> */ |
| /* Returns the horizontal or vertical metrics in font units for a */ |
| /* given glyph. The metrics are the left side bearing (resp. top */ |
| /* side bearing) and advance width (resp. advance height). */ |
| /* */ |
| /* <Input> */ |
| /* header :: A pointer to either the horizontal or vertical metrics */ |
| /* structure. */ |
| /* */ |
| /* idx :: The glyph index. */ |
| /* */ |
| /* <Output> */ |
| /* bearing :: The bearing, either left side or top side. */ |
| /* */ |
| /* advance :: The advance width resp. advance height. */ |
| /* */ |
| /* <Note> */ |
| /* This function will much probably move to another component in the */ |
| /* near future, but I haven't decided which yet. */ |
| /* */ |
| FT_LOCAL_DEF( void ) |
| TT_Get_Metrics( TT_HoriHeader* header, |
| FT_UInt idx, |
| FT_Short* bearing, |
| FT_UShort* advance ) |
| { |
| TT_LongMetrics longs_m; |
| FT_UShort k = header->number_Of_HMetrics; |
| |
| |
| if ( idx < (FT_UInt)k ) |
| { |
| longs_m = (TT_LongMetrics )header->long_metrics + idx; |
| *bearing = longs_m->bearing; |
| *advance = longs_m->advance; |
| } |
| else |
| { |
| *bearing = ((TT_ShortMetrics*)header->short_metrics)[idx - k]; |
| *advance = ((TT_LongMetrics )header->long_metrics)[k - 1].advance; |
| } |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Returns the horizontal metrics in font units for a given glyph. If */ |
| /* `check' is true, take care of monospaced fonts by returning the */ |
| /* advance width maximum. */ |
| /* */ |
| static void |
| Get_HMetrics( TT_Face face, |
| FT_UInt idx, |
| FT_Bool check, |
| FT_Short* lsb, |
| FT_UShort* aw ) |
| { |
| TT_Get_Metrics( &face->horizontal, idx, lsb, aw ); |
| |
| if ( check && face->postscript.isFixedPitch ) |
| *aw = face->horizontal.advance_Width_Max; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Returns the advance width table for a given pixel size if it is found */ |
| /* in the font's `hdmx' table (if any). */ |
| /* */ |
| static FT_Byte* |
| Get_Advance_Widths( TT_Face face, |
| FT_UShort ppem ) |
| { |
| FT_UShort n; |
| |
| |
| for ( n = 0; n < face->hdmx.num_records; n++ ) |
| if ( face->hdmx.records[n].ppem == ppem ) |
| return face->hdmx.records[n].widths; |
| |
| return NULL; |
| } |
| |
| |
| #define cur_to_org( n, zone ) \ |
| FT_MEM_COPY( (zone)->org, (zone)->cur, (n) * sizeof ( FT_Vector ) ) |
| |
| #define org_to_cur( n, zone ) \ |
| FT_MEM_COPY( (zone)->cur, (zone)->org, (n) * sizeof ( FT_Vector ) ) |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Translates an array of coordinates. */ |
| /* */ |
| static void |
| translate_array( FT_UInt n, |
| FT_Vector* coords, |
| FT_Pos delta_x, |
| FT_Pos delta_y ) |
| { |
| FT_UInt k; |
| |
| |
| if ( delta_x ) |
| for ( k = 0; k < n; k++ ) |
| coords[k].x += delta_x; |
| |
| if ( delta_y ) |
| for ( k = 0; k < n; k++ ) |
| coords[k].y += delta_y; |
| } |
| |
| |
| static void |
| tt_prepare_zone( TT_GlyphZone zone, |
| FT_GlyphLoad load, |
| FT_UInt start_point, |
| FT_UInt start_contour ) |
| { |
| zone->n_points = (FT_UShort)( load->outline.n_points - start_point ); |
| zone->n_contours = (FT_Short) ( load->outline.n_contours - start_contour ); |
| zone->org = load->extra_points + start_point; |
| zone->cur = load->outline.points + start_point; |
| zone->tags = (FT_Byte*)load->outline.tags + start_point; |
| zone->contours = (FT_UShort*)load->outline.contours + start_contour; |
| } |
| |
| |
| #undef IS_HINTED |
| #define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 ) |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* The following functions are used by default with TrueType fonts. */ |
| /* However, they can be replaced by alternatives if we need to support */ |
| /* TrueType-compressed formats (like MicroType) in the future. */ |
| /* */ |
| /*************************************************************************/ |
| |
| FT_CALLBACK_DEF( FT_Error ) |
| TT_Access_Glyph_Frame( TT_Loader loader, |
| FT_UInt glyph_index, |
| FT_ULong offset, |
| FT_UInt byte_count ) |
| { |
| FT_Error error; |
| FT_Stream stream = loader->stream; |
| |
| /* for non-debug mode */ |
| FT_UNUSED( glyph_index ); |
| |
| |
| FT_TRACE5(( "Glyph %ld\n", glyph_index )); |
| |
| /* the following line sets the `error' variable through macros! */ |
| if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) |
| return error; |
| |
| return TT_Err_Ok; |
| } |
| |
| |
| FT_CALLBACK_DEF( void ) |
| TT_Forget_Glyph_Frame( TT_Loader loader ) |
| { |
| FT_Stream stream = loader->stream; |
| |
| |
| FT_FRAME_EXIT(); |
| } |
| |
| |
| FT_CALLBACK_DEF( FT_Error ) |
| TT_Load_Glyph_Header( TT_Loader loader ) |
| { |
| FT_Stream stream = loader->stream; |
| FT_Int byte_len = loader->byte_len - 10; |
| |
| |
| if ( byte_len < 0 ) |
| return TT_Err_Invalid_Outline; |
| |
| loader->n_contours = FT_GET_SHORT(); |
| |
| loader->bbox.xMin = FT_GET_SHORT(); |
| loader->bbox.yMin = FT_GET_SHORT(); |
| loader->bbox.xMax = FT_GET_SHORT(); |
| loader->bbox.yMax = FT_GET_SHORT(); |
| |
| FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); |
| FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, |
| loader->bbox.xMax )); |
| FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, |
| loader->bbox.yMax )); |
| loader->byte_len = byte_len; |
| |
| return TT_Err_Ok; |
| } |
| |
| |
| FT_CALLBACK_DEF( FT_Error ) |
| TT_Load_Simple_Glyph( TT_Loader load ) |
| { |
| FT_Error error; |
| FT_Stream stream = load->stream; |
| FT_GlyphLoader gloader = load->gloader; |
| FT_Int n_contours = load->n_contours; |
| FT_Outline* outline; |
| TT_Face face = (TT_Face)load->face; |
| TT_GlyphSlot slot = (TT_GlyphSlot)load->glyph; |
| FT_UShort n_ins; |
| FT_Int n, n_points; |
| FT_Int byte_len = load->byte_len; |
| |
| |
| /* reading the contours endpoints & number of points */ |
| { |
| short* cur = gloader->current.outline.contours; |
| short* limit = cur + n_contours; |
| |
| |
| /* check space for contours array + instructions count */ |
| byte_len -= 2 * ( n_contours + 1 ); |
| if ( byte_len < 0 ) |
| goto Invalid_Outline; |
| |
| for ( ; cur < limit; cur++ ) |
| cur[0] = FT_GET_USHORT(); |
| |
| n_points = 0; |
| if ( n_contours > 0 ) |
| n_points = cur[-1] + 1; |
| |
| error = FT_GlyphLoader_CheckPoints( gloader, n_points + 2, 0 ); |
| if ( error ) |
| goto Fail; |
| |
| /* we'd better check the contours table right now */ |
| outline = &gloader->current.outline; |
| |
| for ( cur = outline->contours + 1; cur < limit; cur++ ) |
| if ( cur[-1] >= cur[0] ) |
| goto Invalid_Outline; |
| } |
| |
| /* reading the bytecode instructions */ |
| slot->control_len = 0; |
| slot->control_data = 0; |
| |
| n_ins = FT_GET_USHORT(); |
| |
| FT_TRACE5(( " Instructions size: %d\n", n_ins )); |
| |
| if ( n_ins > face->max_profile.maxSizeOfInstructions ) |
| { |
| FT_TRACE0(( "TT_Load_Simple_Glyph: Too many instructions!\n" )); |
| error = TT_Err_Too_Many_Hints; |
| goto Fail; |
| } |
| |
| byte_len -= n_ins; |
| if ( byte_len < 0 ) |
| { |
| FT_TRACE0(( "TT_Load_Simple_Glyph: Instruction count mismatch!\n" )); |
| error = TT_Err_Too_Many_Hints; |
| goto Fail; |
| } |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| if ( ( load->load_flags & |
| ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) == 0 && |
| load->instructions ) |
| { |
| slot->control_len = n_ins; |
| slot->control_data = load->instructions; |
| |
| FT_MEM_COPY( load->instructions, stream->cursor, n_ins ); |
| } |
| |
| #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ |
| |
| stream->cursor += n_ins; |
| |
| /* reading the point tags */ |
| { |
| FT_Byte* flag = (FT_Byte*)outline->tags; |
| FT_Byte* limit = flag + n_points; |
| FT_Byte c, count; |
| |
| |
| while ( flag < limit ) |
| { |
| if ( --byte_len < 0 ) |
| goto Invalid_Outline; |
| |
| *flag++ = c = FT_GET_BYTE(); |
| if ( c & 8 ) |
| { |
| if ( --byte_len < 0 ) |
| goto Invalid_Outline; |
| |
| count = FT_GET_BYTE(); |
| if ( flag + count > limit ) |
| goto Invalid_Outline; |
| |
| for ( ; count > 0; count-- ) |
| *flag++ = c; |
| } |
| } |
| |
| /* check that there is enough room to load the coordinates */ |
| for ( flag = (FT_Byte*)outline->tags; flag < limit; flag++ ) |
| { |
| if ( *flag & 2 ) |
| byte_len -= 1; |
| else if ( ( *flag & 16 ) == 0 ) |
| byte_len -= 2; |
| |
| if ( *flag & 4 ) |
| byte_len -= 1; |
| else if ( ( *flag & 32 ) == 0 ) |
| byte_len -= 2; |
| } |
| |
| if ( byte_len < 0 ) |
| goto Invalid_Outline; |
| } |
| |
| /* reading the X coordinates */ |
| |
| { |
| FT_Vector* vec = outline->points; |
| FT_Vector* limit = vec + n_points; |
| FT_Byte* flag = (FT_Byte*)outline->tags; |
| FT_Pos x = 0; |
| |
| |
| for ( ; vec < limit; vec++, flag++ ) |
| { |
| FT_Pos y = 0; |
| |
| |
| if ( *flag & 2 ) |
| { |
| y = FT_GET_BYTE(); |
| if ( ( *flag & 16 ) == 0 ) |
| y = -y; |
| } |
| else if ( ( *flag & 16 ) == 0 ) |
| y = FT_GET_SHORT(); |
| |
| x += y; |
| vec->x = x; |
| } |
| } |
| |
| /* reading the Y coordinates */ |
| |
| { |
| FT_Vector* vec = gloader->current.outline.points; |
| FT_Vector* limit = vec + n_points; |
| FT_Byte* flag = (FT_Byte*)outline->tags; |
| FT_Pos x = 0; |
| |
| |
| for ( ; vec < limit; vec++, flag++ ) |
| { |
| FT_Pos y = 0; |
| |
| |
| if ( *flag & 4 ) |
| { |
| y = FT_GET_BYTE(); |
| if ( ( *flag & 32 ) == 0 ) |
| y = -y; |
| } |
| else if ( ( *flag & 32 ) == 0 ) |
| y = FT_GET_SHORT(); |
| |
| x += y; |
| vec->y = x; |
| } |
| } |
| |
| /* clear the touch tags */ |
| for ( n = 0; n < n_points; n++ ) |
| outline->tags[n] &= FT_Curve_Tag_On; |
| |
| outline->n_points = (FT_UShort)n_points; |
| outline->n_contours = (FT_Short) n_contours; |
| |
| load->byte_len = byte_len; |
| |
| Fail: |
| return error; |
| |
| Invalid_Outline: |
| error = TT_Err_Invalid_Outline; |
| goto Fail; |
| } |
| |
| |
| FT_CALLBACK_DEF( FT_Error ) |
| TT_Load_Composite_Glyph( TT_Loader loader ) |
| { |
| FT_Error error; |
| FT_Stream stream = loader->stream; |
| FT_GlyphLoader gloader = loader->gloader; |
| FT_SubGlyph subglyph; |
| FT_UInt num_subglyphs; |
| FT_Int byte_len = loader->byte_len; |
| |
| |
| num_subglyphs = 0; |
| |
| do |
| { |
| FT_Fixed xx, xy, yy, yx; |
| |
| |
| /* check that we can load a new subglyph */ |
| error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); |
| if ( error ) |
| goto Fail; |
| |
| /* check space */ |
| byte_len -= 4; |
| if ( byte_len < 0 ) |
| goto Invalid_Composite; |
| |
| subglyph = gloader->current.subglyphs + num_subglyphs; |
| |
| subglyph->arg1 = subglyph->arg2 = 0; |
| |
| subglyph->flags = FT_GET_USHORT(); |
| subglyph->index = FT_GET_USHORT(); |
| |
| /* check space */ |
| byte_len -= 2; |
| if ( subglyph->flags & ARGS_ARE_WORDS ) |
| byte_len -= 2; |
| if ( subglyph->flags & WE_HAVE_A_SCALE ) |
| byte_len -= 2; |
| else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) |
| byte_len -= 4; |
| else if ( subglyph->flags & WE_HAVE_A_2X2 ) |
| byte_len -= 8; |
| |
| if ( byte_len < 0 ) |
| goto Invalid_Composite; |
| |
| /* read arguments */ |
| if ( subglyph->flags & ARGS_ARE_WORDS ) |
| { |
| subglyph->arg1 = FT_GET_SHORT(); |
| subglyph->arg2 = FT_GET_SHORT(); |
| } |
| else |
| { |
| subglyph->arg1 = FT_GET_CHAR(); |
| subglyph->arg2 = FT_GET_CHAR(); |
| } |
| |
| /* read transform */ |
| xx = yy = 0x10000L; |
| xy = yx = 0; |
| |
| if ( subglyph->flags & WE_HAVE_A_SCALE ) |
| { |
| xx = (FT_Fixed)FT_GET_SHORT() << 2; |
| yy = xx; |
| } |
| else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) |
| { |
| xx = (FT_Fixed)FT_GET_SHORT() << 2; |
| yy = (FT_Fixed)FT_GET_SHORT() << 2; |
| } |
| else if ( subglyph->flags & WE_HAVE_A_2X2 ) |
| { |
| xx = (FT_Fixed)FT_GET_SHORT() << 2; |
| xy = (FT_Fixed)FT_GET_SHORT() << 2; |
| yx = (FT_Fixed)FT_GET_SHORT() << 2; |
| yy = (FT_Fixed)FT_GET_SHORT() << 2; |
| } |
| |
| subglyph->transform.xx = xx; |
| subglyph->transform.xy = xy; |
| subglyph->transform.yx = yx; |
| subglyph->transform.yy = yy; |
| |
| num_subglyphs++; |
| |
| } while ( subglyph->flags & MORE_COMPONENTS ); |
| |
| gloader->current.num_subglyphs = num_subglyphs; |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| { |
| /* we must undo the FT_FRAME_ENTER in order to point to the */ |
| /* composite instructions, if we find some. */ |
| /* we will process them later... */ |
| /* */ |
| loader->ins_pos = (FT_ULong)( FT_STREAM_POS() + |
| stream->cursor - stream->limit ); |
| } |
| #endif |
| |
| loader->byte_len = byte_len; |
| |
| Fail: |
| return error; |
| |
| Invalid_Composite: |
| error = TT_Err_Invalid_Composite; |
| goto Fail; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| TT_Init_Glyph_Loading( TT_Face face ) |
| { |
| face->access_glyph_frame = TT_Access_Glyph_Frame; |
| face->read_glyph_header = TT_Load_Glyph_Header; |
| face->read_simple_glyph = TT_Load_Simple_Glyph; |
| face->read_composite_glyph = TT_Load_Composite_Glyph; |
| face->forget_glyph_frame = TT_Forget_Glyph_Frame; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* TT_Process_Simple_Glyph */ |
| /* */ |
| /* <Description> */ |
| /* Once a simple glyph has been loaded, it needs to be processed. */ |
| /* Usually, this means scaling and hinting through bytecode */ |
| /* interpretation. */ |
| /* */ |
| static FT_Error |
| TT_Process_Simple_Glyph( TT_Loader load, |
| FT_Bool debug ) |
| { |
| FT_GlyphLoader gloader = load->gloader; |
| FT_Outline* outline = &gloader->current.outline; |
| FT_UInt n_points = outline->n_points; |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| FT_UInt n_ins; |
| #endif |
| TT_GlyphZone zone = &load->zone; |
| FT_Error error = TT_Err_Ok; |
| |
| FT_UNUSED( debug ); /* used by truetype interpreter only */ |
| |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| n_ins = load->glyph->control_len; |
| #endif |
| |
| /* add shadow points */ |
| |
| /* Now add the two shadow points at n and n + 1. */ |
| /* We need the left side bearing and advance width. */ |
| |
| { |
| FT_Vector* pp1; |
| FT_Vector* pp2; |
| |
| |
| /* pp1 = xMin - lsb */ |
| pp1 = outline->points + n_points; |
| pp1->x = load->bbox.xMin - load->left_bearing; |
| pp1->y = 0; |
| |
| /* pp2 = pp1 + aw */ |
| pp2 = pp1 + 1; |
| pp2->x = pp1->x + load->advance; |
| pp2->y = 0; |
| |
| outline->tags[n_points ] = 0; |
| outline->tags[n_points + 1] = 0; |
| } |
| |
| /* Note that we return two more points that are not */ |
| /* part of the glyph outline. */ |
| |
| n_points += 2; |
| |
| /* set up zone for hinting */ |
| tt_prepare_zone( zone, &gloader->current, 0, 0 ); |
| |
| /* eventually scale the glyph */ |
| if ( !( load->load_flags & FT_LOAD_NO_SCALE ) ) |
| { |
| FT_Vector* vec = zone->cur; |
| FT_Vector* limit = vec + n_points; |
| FT_Fixed x_scale = load->size->metrics.x_scale; |
| FT_Fixed y_scale = load->size->metrics.y_scale; |
| |
| |
| /* first scale the glyph points */ |
| for ( ; vec < limit; vec++ ) |
| { |
| vec->x = FT_MulFix( vec->x, x_scale ); |
| vec->y = FT_MulFix( vec->y, y_scale ); |
| } |
| } |
| |
| cur_to_org( n_points, zone ); |
| |
| /* eventually hint the glyph */ |
| if ( IS_HINTED( load->load_flags ) ) |
| { |
| FT_Pos x = zone->org[n_points-2].x; |
| |
| |
| x = ( ( x + 32 ) & -64 ) - x; |
| translate_array( n_points, zone->org, x, 0 ); |
| |
| org_to_cur( n_points, zone ); |
| |
| zone->cur[n_points - 1].x = ( zone->cur[n_points - 1].x + 32 ) & -64; |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| /* now consider hinting */ |
| if ( n_ins > 0 ) |
| { |
| error = TT_Set_CodeRange( load->exec, tt_coderange_glyph, |
| load->exec->glyphIns, n_ins ); |
| if ( error ) |
| goto Exit; |
| |
| load->exec->is_composite = FALSE; |
| load->exec->pedantic_hinting = (FT_Bool)( load->load_flags & |
| FT_LOAD_PEDANTIC ); |
| load->exec->pts = *zone; |
| load->exec->pts.n_points += 2; |
| |
| error = TT_Run_Context( load->exec, debug ); |
| if ( error && load->exec->pedantic_hinting ) |
| goto Exit; |
| |
| error = TT_Err_Ok; /* ignore bytecode errors in non-pedantic mode */ |
| } |
| |
| #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ |
| |
| } |
| |
| /* save glyph phantom points */ |
| if ( !load->preserve_pps ) |
| { |
| load->pp1 = zone->cur[n_points - 2]; |
| load->pp2 = zone->cur[n_points - 1]; |
| } |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| Exit: |
| #endif |
| return error; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* load_truetype_glyph */ |
| /* */ |
| /* <Description> */ |
| /* Loads a given truetype glyph. Handles composites and uses a */ |
| /* TT_Loader object. */ |
| /* */ |
| static FT_Error |
| load_truetype_glyph( TT_Loader loader, |
| FT_UInt glyph_index ) |
| { |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| FT_Stream stream = loader->stream; |
| #endif |
| |
| FT_Error error; |
| TT_Face face = (TT_Face)loader->face; |
| FT_ULong offset; |
| FT_Int contours_count; |
| FT_UInt idx, num_points, count; |
| FT_Fixed x_scale, y_scale; |
| FT_GlyphLoader gloader = loader->gloader; |
| FT_Bool opened_frame = 0; |
| |
| |
| /* check glyph index */ |
| idx = glyph_index; |
| if ( idx >= (FT_UInt)face->root.num_glyphs ) |
| { |
| error = TT_Err_Invalid_Glyph_Index; |
| goto Exit; |
| } |
| |
| loader->glyph_index = glyph_index; |
| num_points = 0; |
| |
| x_scale = 0x10000L; |
| y_scale = 0x10000L; |
| if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) |
| { |
| x_scale = loader->size->metrics.x_scale; |
| y_scale = loader->size->metrics.y_scale; |
| } |
| |
| /* get horizontal metrics */ |
| { |
| FT_Short left_bearing; |
| FT_UShort advance_width; |
| |
| |
| Get_HMetrics( face, idx, |
| (FT_Bool)!( loader->load_flags & |
| FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), |
| &left_bearing, |
| &advance_width ); |
| |
| loader->left_bearing = left_bearing; |
| loader->advance = advance_width; |
| |
| if ( !loader->linear_def ) |
| { |
| loader->linear_def = 1; |
| loader->linear = advance_width; |
| } |
| } |
| |
| offset = face->glyph_locations[idx]; |
| count = 0; |
| |
| if ( idx < (FT_UInt)face->num_locations - 1 ) |
| count = face->glyph_locations[idx + 1] - offset; |
| |
| if ( count == 0 ) |
| { |
| /* as described by Frederic Loyer, these are spaces, and */ |
| /* not the unknown glyph. */ |
| loader->bbox.xMin = 0; |
| loader->bbox.xMax = 0; |
| loader->bbox.yMin = 0; |
| loader->bbox.yMax = 0; |
| |
| loader->pp1.x = 0; |
| loader->pp2.x = loader->advance; |
| |
| if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) |
| loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| if ( loader->exec ) |
| loader->exec->glyphSize = 0; |
| |
| #endif |
| |
| error = TT_Err_Ok; |
| goto Exit; |
| } |
| |
| loader->byte_len = (FT_Int)count; |
| |
| offset = loader->glyf_offset + offset; |
| |
| /* access glyph frame */ |
| error = face->access_glyph_frame( loader, glyph_index, offset, count ); |
| if ( error ) |
| goto Exit; |
| |
| opened_frame = 1; |
| |
| /* read first glyph header */ |
| error = face->read_glyph_header( loader ); |
| if ( error ) |
| goto Fail; |
| |
| contours_count = loader->n_contours; |
| |
| count -= 10; |
| |
| loader->pp1.x = loader->bbox.xMin - loader->left_bearing; |
| loader->pp1.y = 0; |
| loader->pp2.x = loader->pp1.x + loader->advance; |
| loader->pp2.y = 0; |
| |
| if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) |
| { |
| loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); |
| loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); |
| } |
| |
| /***********************************************************************/ |
| /***********************************************************************/ |
| /***********************************************************************/ |
| |
| /* if it is a simple glyph, load it */ |
| |
| if ( contours_count >= 0 ) |
| { |
| /* check that we can add the contours to the glyph */ |
| error = FT_GlyphLoader_CheckPoints( gloader, 0, contours_count ); |
| if ( error ) |
| goto Fail; |
| |
| error = face->read_simple_glyph( loader ); |
| if ( error ) |
| goto Fail; |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| { |
| TT_Size size = (TT_Size)loader->size; |
| |
| |
| error = TT_Process_Simple_Glyph( loader, |
| (FT_Bool)( size && size->debug ) ); |
| } |
| |
| #else |
| |
| error = TT_Process_Simple_Glyph( loader, 0 ); |
| |
| #endif |
| |
| if ( error ) |
| goto Fail; |
| |
| FT_GlyphLoader_Add( gloader ); |
| |
| /* Note: We could have put the simple loader source there */ |
| /* but the code is fat enough already :-) */ |
| } |
| |
| /***********************************************************************/ |
| /***********************************************************************/ |
| /***********************************************************************/ |
| |
| /* otherwise, load a composite! */ |
| else |
| { |
| TT_GlyphSlot glyph = (TT_GlyphSlot)loader->glyph; |
| FT_UInt start_point; |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| FT_UInt start_contour; |
| FT_ULong ins_pos; /* position of composite instructions, if any */ |
| #endif |
| |
| |
| /* for each subglyph, read composite header */ |
| start_point = gloader->base.outline.n_points; |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| start_contour = gloader->base.outline.n_contours; |
| #endif |
| |
| error = face->read_composite_glyph( loader ); |
| if ( error ) |
| goto Fail; |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| ins_pos = loader->ins_pos; |
| #endif |
| face->forget_glyph_frame( loader ); |
| opened_frame = 0; |
| |
| /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ |
| /* `as is' in the glyph slot (the client application will be */ |
| /* responsible for interpreting this data)... */ |
| /* */ |
| if ( loader->load_flags & FT_LOAD_NO_RECURSE ) |
| { |
| /* set up remaining glyph fields */ |
| FT_GlyphLoader_Add( gloader ); |
| |
| glyph->num_subglyphs = gloader->base.num_subglyphs; |
| glyph->format = ft_glyph_format_composite; |
| glyph->subglyphs = gloader->base.subglyphs; |
| |
| goto Exit; |
| } |
| |
| /*********************************************************************/ |
| /*********************************************************************/ |
| /*********************************************************************/ |
| |
| /* Now, read each subglyph independently. */ |
| { |
| FT_Int n, num_base_points, num_new_points; |
| FT_SubGlyph subglyph = 0; |
| |
| FT_UInt num_subglyphs = gloader->current.num_subglyphs; |
| FT_UInt num_base_subgs = gloader->base.num_subglyphs; |
| |
| |
| FT_GlyphLoader_Add( gloader ); |
| |
| for ( n = 0; n < (FT_Int)num_subglyphs; n++ ) |
| { |
| FT_Vector pp1, pp2; |
| FT_Pos x, y; |
| |
| |
| /* Each time we call load_truetype_glyph in this loop, the */ |
| /* value of `gloader.base.subglyphs' can change due to table */ |
| /* reallocations. We thus need to recompute the subglyph */ |
| /* pointer on each iteration. */ |
| subglyph = gloader->base.subglyphs + num_base_subgs + n; |
| |
| pp1 = loader->pp1; |
| pp2 = loader->pp2; |
| |
| num_base_points = gloader->base.outline.n_points; |
| |
| error = load_truetype_glyph( loader, subglyph->index ); |
| if ( error ) |
| goto Fail; |
| |
| /* restore subglyph pointer */ |
| subglyph = gloader->base.subglyphs + num_base_subgs + n; |
| |
| if ( subglyph->flags & USE_MY_METRICS ) |
| { |
| pp1 = loader->pp1; |
| pp2 = loader->pp2; |
| } |
| else |
| { |
| loader->pp1 = pp1; |
| loader->pp2 = pp2; |
| } |
| |
| num_points = gloader->base.outline.n_points; |
| |
| num_new_points = num_points - num_base_points; |
| |
| /* now perform the transform required for this subglyph */ |
| |
| if ( subglyph->flags & ( WE_HAVE_A_SCALE | |
| WE_HAVE_AN_XY_SCALE | |
| WE_HAVE_A_2X2 ) ) |
| { |
| FT_Vector* cur = gloader->base.outline.points + |
| num_base_points; |
| FT_Vector* org = gloader->base.extra_points + |
| num_base_points; |
| FT_Vector* limit = cur + num_new_points; |
| |
| |
| for ( ; cur < limit; cur++, org++ ) |
| { |
| FT_Vector_Transform( cur, &subglyph->transform ); |
| FT_Vector_Transform( org, &subglyph->transform ); |
| } |
| } |
| |
| /* apply offset */ |
| |
| if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) |
| { |
| FT_UInt k = subglyph->arg1; |
| FT_UInt l = subglyph->arg2; |
| FT_Vector* p1; |
| FT_Vector* p2; |
| |
| |
| if ( start_point + k >= (FT_UInt)num_base_points || |
| l >= (FT_UInt)num_new_points ) |
| { |
| error = TT_Err_Invalid_Composite; |
| goto Fail; |
| } |
| |
| l += num_base_points; |
| |
| p1 = gloader->base.outline.points + start_point + k; |
| p2 = gloader->base.outline.points + start_point + l; |
| |
| x = p1->x - p2->x; |
| y = p1->y - p2->y; |
| } |
| else |
| { |
| x = subglyph->arg1; |
| y = subglyph->arg2; |
| |
| if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) |
| { |
| x = FT_MulFix( x, x_scale ); |
| y = FT_MulFix( y, y_scale ); |
| |
| if ( subglyph->flags & ROUND_XY_TO_GRID ) |
| { |
| x = ( x + 32 ) & -64; |
| y = ( y + 32 ) & -64; |
| } |
| } |
| } |
| |
| if ( x | y ) |
| { |
| translate_array( num_new_points, |
| gloader->base.outline.points + num_base_points, |
| x, y ); |
| |
| translate_array( num_new_points, |
| gloader->base.extra_points + num_base_points, |
| x, y ); |
| } |
| } |
| |
| /*******************************************************************/ |
| /*******************************************************************/ |
| /*******************************************************************/ |
| |
| /* we have finished loading all sub-glyphs; now, look for */ |
| /* instructions for this composite! */ |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| if ( num_subglyphs > 0 && |
| loader->exec && |
| ins_pos > 0 && |
| subglyph->flags & WE_HAVE_INSTR ) |
| { |
| FT_UShort n_ins; |
| TT_ExecContext exec = loader->exec; |
| TT_GlyphZone pts; |
| FT_Vector* pp1; |
| |
| |
| /* read size of instructions */ |
| if ( FT_STREAM_SEEK( ins_pos ) || |
| FT_READ_USHORT( n_ins ) ) |
| goto Fail; |
| FT_TRACE5(( " Instructions size = %d\n", n_ins )); |
| |
| /* in some fonts? */ |
| if ( n_ins == 0xFFFFU ) |
| n_ins = 0; |
| |
| /* check it */ |
| if ( n_ins > face->max_profile.maxSizeOfInstructions ) |
| { |
| FT_TRACE0(( "Too many instructions (%d) in composite glyph %ld\n", |
| n_ins, subglyph->index )); |
| error = TT_Err_Too_Many_Hints; |
| goto Fail; |
| } |
| |
| /* read the instructions */ |
| if ( FT_STREAM_READ( exec->glyphIns, n_ins ) ) |
| goto Fail; |
| |
| glyph->control_data = exec->glyphIns; |
| glyph->control_len = n_ins; |
| |
| error = TT_Set_CodeRange( exec, |
| tt_coderange_glyph, |
| exec->glyphIns, |
| n_ins ); |
| if ( error ) |
| goto Fail; |
| |
| /* prepare the execution context */ |
| tt_prepare_zone( &exec->pts, &gloader->base, |
| start_point, start_contour ); |
| pts = &exec->pts; |
| |
| pts->n_points = (short)(num_points + 2); |
| pts->n_contours = gloader->base.outline.n_contours; |
| |
| /* add phantom points */ |
| pp1 = pts->cur + num_points; |
| pp1[0] = loader->pp1; |
| pp1[1] = loader->pp2; |
| |
| pts->tags[num_points ] = 0; |
| pts->tags[num_points + 1] = 0; |
| |
| /* if hinting, round the phantom points */ |
| if ( IS_HINTED( loader->load_flags ) ) |
| { |
| pp1[0].x = ( ( loader->pp1.x + 32 ) & -64 ); |
| pp1[1].x = ( ( loader->pp2.x + 32 ) & -64 ); |
| } |
| |
| { |
| FT_UInt k; |
| |
| |
| for ( k = 0; k < num_points; k++ ) |
| pts->tags[k] &= FT_Curve_Tag_On; |
| } |
| |
| cur_to_org( num_points + 2, pts ); |
| |
| /* now consider hinting */ |
| if ( IS_HINTED( loader->load_flags ) && n_ins > 0 ) |
| { |
| exec->is_composite = TRUE; |
| exec->pedantic_hinting = |
| (FT_Bool)( loader->load_flags & FT_LOAD_PEDANTIC ); |
| |
| error = TT_Run_Context( exec, ((TT_Size)loader->size)->debug ); |
| if ( error && exec->pedantic_hinting ) |
| goto Fail; |
| } |
| |
| /* save glyph origin and advance points */ |
| loader->pp1 = pp1[0]; |
| loader->pp2 = pp1[1]; |
| } |
| |
| #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ |
| |
| } |
| /* end of composite loading */ |
| } |
| |
| /***********************************************************************/ |
| /***********************************************************************/ |
| /***********************************************************************/ |
| |
| Fail: |
| if ( opened_frame ) |
| face->forget_glyph_frame( loader ); |
| |
| Exit: |
| return error; |
| } |
| |
| |
| static void |
| compute_glyph_metrics( TT_Loader loader, |
| FT_UInt glyph_index ) |
| { |
| FT_BBox bbox; |
| TT_Face face = (TT_Face)loader->face; |
| FT_Fixed y_scale; |
| TT_GlyphSlot glyph = loader->glyph; |
| TT_Size size = (TT_Size)loader->size; |
| |
| |
| y_scale = 0x10000L; |
| if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) |
| y_scale = size->root.metrics.y_scale; |
| |
| if ( glyph->format != ft_glyph_format_composite ) |
| { |
| glyph->outline.flags &= ~ft_outline_single_pass; |
| |
| /* copy outline to our glyph slot */ |
| FT_GlyphLoader_CopyPoints( glyph->internal->loader, loader->gloader ); |
| glyph->outline = glyph->internal->loader->base.outline; |
| |
| /* translate array so that (0,0) is the glyph's origin */ |
| FT_Outline_Translate( &glyph->outline, -loader->pp1.x, 0 ); |
| |
| FT_Outline_Get_CBox( &glyph->outline, &bbox ); |
| |
| if ( IS_HINTED( loader->load_flags ) ) |
| { |
| /* grid-fit the bounding box */ |
| bbox.xMin &= -64; |
| bbox.yMin &= -64; |
| bbox.xMax = ( bbox.xMax + 63 ) & -64; |
| bbox.yMax = ( bbox.yMax + 63 ) & -64; |
| } |
| } |
| else |
| bbox = loader->bbox; |
| |
| /* get the device-independent horizontal advance. It is scaled later */ |
| /* by the base layer. */ |
| { |
| FT_Pos advance = loader->linear; |
| |
| |
| /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ |
| /* correctly support DynaLab fonts, which have an incorrect */ |
| /* `advance_Width_Max' field! It is used, to my knowledge, */ |
| /* exclusively in the X-TrueType font server. */ |
| /* */ |
| if ( face->postscript.isFixedPitch && |
| ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) |
| advance = face->horizontal.advance_Width_Max; |
| |
| /* we need to return the advance in font units in linearHoriAdvance, */ |
| /* it will be scaled later by the base layer. */ |
| glyph->linearHoriAdvance = advance; |
| } |
| |
| glyph->metrics.horiBearingX = bbox.xMin; |
| glyph->metrics.horiBearingY = bbox.yMax; |
| glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; |
| |
| /* don't forget to hint the advance when we need to */ |
| if ( IS_HINTED( loader->load_flags ) ) |
| glyph->metrics.horiAdvance = ( glyph->metrics.horiAdvance + 32 ) & -64; |
| |
| /* Now take care of vertical metrics. In the case where there is */ |
| /* no vertical information within the font (relatively common), make */ |
| /* up some metrics by `hand'... */ |
| |
| { |
| FT_Short top_bearing; /* vertical top side bearing (EM units) */ |
| FT_UShort advance_height; /* vertical advance height (EM units) */ |
| |
| FT_Pos left; /* scaled vertical left side bearing */ |
| FT_Pos top; /* scaled vertical top side bearing */ |
| FT_Pos advance; /* scaled vertical advance height */ |
| |
| |
| /* Get the unscaled `tsb' and `ah' */ |
| if ( face->vertical_info && |
| face->vertical.number_Of_VMetrics > 0 ) |
| { |
| /* Don't assume that both the vertical header and vertical */ |
| /* metrics are present in the same font :-) */ |
| |
| TT_Get_Metrics( (TT_HoriHeader*)&face->vertical, |
| glyph_index, |
| &top_bearing, |
| &advance_height ); |
| } |
| else |
| { |
| /* Make up the distances from the horizontal header. */ |
| |
| /* NOTE: The OS/2 values are the only `portable' ones, */ |
| /* which is why we use them, if there is an OS/2 */ |
| /* table in the font. Otherwise, we use the */ |
| /* values defined in the horizontal header. */ |
| /* */ |
| /* NOTE2: The sTypoDescender is negative, which is why */ |
| /* we compute the baseline-to-baseline distance */ |
| /* here with: */ |
| /* ascender - descender + linegap */ |
| /* */ |
| if ( face->os2.version != 0xFFFFU ) |
| { |
| top_bearing = (FT_Short)( face->os2.sTypoLineGap / 2 ); |
| advance_height = (FT_UShort)( face->os2.sTypoAscender - |
| face->os2.sTypoDescender + |
| face->os2.sTypoLineGap ); |
| } |
| else |
| { |
| top_bearing = (FT_Short)( face->horizontal.Line_Gap / 2 ); |
| advance_height = (FT_UShort)( face->horizontal.Ascender + |
| face->horizontal.Descender + |
| face->horizontal.Line_Gap ); |
| } |
| } |
| |
| /* We must adjust the top_bearing value from the bounding box given */ |
| /* in the glyph header to te bounding box calculated with */ |
| /* FT_Get_Outline_CBox(). */ |
| |
| /* scale the metrics */ |
| if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) |
| { |
| top = FT_MulFix( top_bearing + loader->bbox.yMax, y_scale ) |
| - bbox.yMax; |
| advance = FT_MulFix( advance_height, y_scale ); |
| } |
| else |
| { |
| top = top_bearing + loader->bbox.yMax - bbox.yMax; |
| advance = advance_height; |
| } |
| |
| /* set the advance height in design units. It is scaled later by */ |
| /* the base layer. */ |
| glyph->linearVertAdvance = advance_height; |
| |
| /* XXX: for now, we have no better algorithm for the lsb, but it */ |
| /* should work fine. */ |
| /* */ |
| left = ( bbox.xMin - bbox.xMax ) / 2; |
| |
| /* grid-fit them if necessary */ |
| if ( IS_HINTED( loader->load_flags ) ) |
| { |
| left &= -64; |
| top = ( top + 63 ) & -64; |
| advance = ( advance + 32 ) & -64; |
| } |
| |
| glyph->metrics.vertBearingX = left; |
| glyph->metrics.vertBearingY = top; |
| glyph->metrics.vertAdvance = advance; |
| } |
| |
| /* adjust advance width to the value contained in the hdmx table */ |
| if ( !face->postscript.isFixedPitch && size && |
| IS_HINTED( loader->load_flags ) ) |
| { |
| FT_Byte* widths = Get_Advance_Widths( face, |
| size->root.metrics.x_ppem ); |
| |
| |
| if ( widths ) |
| glyph->metrics.horiAdvance = widths[glyph_index] << 6; |
| } |
| |
| /* set glyph dimensions */ |
| glyph->metrics.width = bbox.xMax - bbox.xMin; |
| glyph->metrics.height = bbox.yMax - bbox.yMin; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* TT_Load_Glyph */ |
| /* */ |
| /* <Description> */ |
| /* A function used to load a single glyph within a given glyph slot, */ |
| /* for a given size. */ |
| /* */ |
| /* <Input> */ |
| /* glyph :: A handle to a target slot object where the glyph */ |
| /* will be loaded. */ |
| /* */ |
| /* size :: A handle to the source face size at which the glyph */ |
| /* must be scaled/loaded. */ |
| /* */ |
| /* glyph_index :: The index of the glyph in the font file. */ |
| /* */ |
| /* load_flags :: A flag indicating what to load for this glyph. The */ |
| /* FT_LOAD_XXX constants can be used to control the */ |
| /* glyph loading process (e.g., whether the outline */ |
| /* should be scaled, whether to load bitmaps or not, */ |
| /* whether to hint the outline, etc). */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| FT_LOCAL_DEF( FT_Error ) |
| TT_Load_Glyph( TT_Size size, |
| TT_GlyphSlot glyph, |
| FT_UShort glyph_index, |
| FT_UInt load_flags ) |
| { |
| SFNT_Service sfnt; |
| TT_Face face; |
| FT_Stream stream; |
| FT_Error error; |
| TT_LoaderRec loader; |
| |
| |
| face = (TT_Face)glyph->face; |
| sfnt = (SFNT_Service)face->sfnt; |
| stream = face->root.stream; |
| error = 0; |
| |
| if ( !size || ( load_flags & FT_LOAD_NO_SCALE ) || |
| ( load_flags & FT_LOAD_NO_RECURSE ) ) |
| { |
| size = NULL; |
| load_flags |= FT_LOAD_NO_SCALE | |
| FT_LOAD_NO_HINTING | |
| FT_LOAD_NO_BITMAP; |
| } |
| |
| glyph->num_subglyphs = 0; |
| |
| #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS |
| |
| /* try to load embedded bitmap if any */ |
| /* */ |
| /* XXX: The convention should be emphasized in */ |
| /* the documents because it can be confusing. */ |
| if ( size && |
| size->strike_index != 0xFFFFU && |
| sfnt->load_sbits && |
| ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) |
| |
| { |
| TT_SBit_MetricsRec metrics; |
| |
| |
| error = sfnt->load_sbit_image( face, |
| size->strike_index, |
| glyph_index, |
| load_flags, |
| stream, |
| &glyph->bitmap, |
| &metrics ); |
| if ( !error ) |
| { |
| glyph->outline.n_points = 0; |
| glyph->outline.n_contours = 0; |
| |
| glyph->metrics.width = (FT_Pos)metrics.width << 6; |
| glyph->metrics.height = (FT_Pos)metrics.height << 6; |
| |
| glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; |
| glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; |
| glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; |
| |
| glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; |
| glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; |
| glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; |
| |
| glyph->format = ft_glyph_format_bitmap; |
| if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) |
| { |
| glyph->bitmap_left = metrics.vertBearingX; |
| glyph->bitmap_top = metrics.vertBearingY; |
| } |
| else |
| { |
| glyph->bitmap_left = metrics.horiBearingX; |
| glyph->bitmap_top = metrics.horiBearingY; |
| } |
| return error; |
| } |
| } |
| |
| #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ |
| |
| /* return immediately if we only want the embedded bitmaps */ |
| if ( load_flags & FT_LOAD_SBITS_ONLY ) |
| return FT_Err_Invalid_Argument; |
| |
| /* seek to the beginning of the glyph table. For Type 42 fonts */ |
| /* the table might be accessed from a Postscript stream or something */ |
| /* else... */ |
| |
| error = face->goto_table( face, TTAG_glyf, stream, 0 ); |
| if ( error ) |
| { |
| FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); |
| goto Exit; |
| } |
| |
| FT_MEM_SET( &loader, 0, sizeof ( loader ) ); |
| |
| /* update the glyph zone bounds */ |
| { |
| FT_GlyphLoader gloader = FT_FACE_DRIVER(face)->glyph_loader; |
| |
| |
| loader.gloader = gloader; |
| |
| FT_GlyphLoader_Rewind( gloader ); |
| |
| tt_prepare_zone( &loader.zone, &gloader->base, 0, 0 ); |
| tt_prepare_zone( &loader.base, &gloader->base, 0, 0 ); |
| } |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| if ( size ) |
| { |
| /* query new execution context */ |
| loader.exec = size->debug ? size->context : TT_New_Context( face ); |
| if ( !loader.exec ) |
| return TT_Err_Could_Not_Find_Context; |
| |
| TT_Load_Context( loader.exec, face, size ); |
| loader.instructions = loader.exec->glyphIns; |
| |
| /* load default graphics state - if needed */ |
| if ( size->GS.instruct_control & 2 ) |
| loader.exec->GS = tt_default_graphics_state; |
| } |
| |
| #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ |
| |
| /* clear all outline flags, except the `owner' one */ |
| glyph->outline.flags = 0; |
| |
| if ( size && size->root.metrics.y_ppem < 24 ) |
| glyph->outline.flags |= ft_outline_high_precision; |
| |
| /* let's initialize the rest of our loader now */ |
| |
| loader.load_flags = load_flags; |
| |
| loader.face = (FT_Face)face; |
| loader.size = (FT_Size)size; |
| loader.glyph = (FT_GlyphSlot)glyph; |
| loader.stream = stream; |
| |
| loader.glyf_offset = FT_STREAM_POS(); |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| /* if the cvt program has disabled hinting, the argument */ |
| /* is ignored. */ |
| if ( size && ( size->GS.instruct_control & 1 ) ) |
| loader.load_flags |= FT_LOAD_NO_HINTING; |
| |
| #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ |
| |
| /* Main loading loop */ |
| glyph->format = ft_glyph_format_outline; |
| glyph->num_subglyphs = 0; |
| |
| error = load_truetype_glyph( &loader, glyph_index ); |
| if ( !error ) |
| compute_glyph_metrics( &loader, glyph_index ); |
| |
| #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER |
| |
| if ( !size || !size->debug ) |
| TT_Done_Context( loader.exec ); |
| |
| #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* END */ |
