| /***************************************************************************/ |
| /* */ |
| /* ttgload.c */ |
| /* */ |
| /* TrueType Glyph Loader (body). */ |
| /* */ |
| /* Copyright 1996-2001, 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 <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 "ttpload.h" |
| |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| #include "ttgxvar.h" |
| #endif |
| |
| #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 0x0001 |
| #define ARGS_ARE_XY_VALUES 0x0002 |
| #define ROUND_XY_TO_GRID 0x0004 |
| #define WE_HAVE_A_SCALE 0x0008 |
| /* reserved 0x0010 */ |
| #define MORE_COMPONENTS 0x0020 |
| #define WE_HAVE_AN_XY_SCALE 0x0040 |
| #define WE_HAVE_A_2X2 0x0080 |
| #define WE_HAVE_INSTR 0x0100 |
| #define USE_MY_METRICS 0x0200 |
| #define OVERLAP_COMPOUND 0x0400 |
| #define SCALED_COMPONENT_OFFSET 0x0800 |
| #define UNSCALED_COMPONENT_OFFSET 0x1000 |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* 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 ) |
| { |
| ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw ); |
| |
| if ( check && face->postscript.isFixedPitch ) |
| *aw = face->horizontal.advance_Width_Max; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* Returns the vertical metrics in font units for a given glyph. */ |
| /* Greg Hitchcock from Microsoft told us that if there were no `vmtx' */ |
| /* table, typoAscender/Descender from the `OS/2' table would be used */ |
| /* instead, and if there were no `OS/2' table, use ascender/descender */ |
| /* from the `hhea' table. But that is not what Microsoft's rasterizer */ |
| /* apparently does: It uses the ppem value as the advance height, and */ |
| /* sets the top side bearing to be zero. */ |
| /* */ |
| /* The monospace `check' is probably not meaningful here, but we leave */ |
| /* it in for a consistent interface. */ |
| /* */ |
| static void |
| Get_VMetrics( TT_Face face, |
| FT_UInt idx, |
| FT_Bool check, |
| FT_Short* tsb, |
| FT_UShort* ah ) |
| { |
| FT_UNUSED( check ); |
| |
| if ( face->vertical_info ) |
| ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah ); |
| |
| #if 1 /* Empirically determined, at variance with what MS said */ |
| |
| else |
| { |
| *tsb = 0; |
| *ah = face->root.units_per_EM; |
| } |
| |
| #else /* This is what MS said to do. It isn't what they do, however. */ |
| |
| else if ( face->os2.version != 0xFFFFU ) |
| { |
| *tsb = face->os2.sTypoAscender; |
| *ah = face->os2.sTypoAscender - face->os2.sTypoDescender; |
| } |
| else |
| { |
| *tsb = face->horizontal.Ascender; |
| *ah = face->horizontal.Ascender - face->horizontal.Descender; |
| } |
| |
| #endif |
| |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* 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; |
| } |
| |
| |
| #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; |
| |
| loader->cursor = stream->cursor; |
| loader->limit = stream->limit; |
| |
| 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_Byte* p = loader->cursor; |
| FT_Byte* limit = loader->limit; |
| |
| |
| if ( p + 10 > limit ) |
| return TT_Err_Invalid_Outline; |
| |
| loader->n_contours = FT_NEXT_SHORT( p ); |
| |
| loader->bbox.xMin = FT_NEXT_SHORT( p ); |
| loader->bbox.yMin = FT_NEXT_SHORT( p ); |
| loader->bbox.xMax = FT_NEXT_SHORT( p ); |
| loader->bbox.yMax = FT_NEXT_SHORT( p ); |
| |
| 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->cursor = p; |
| |
| return TT_Err_Ok; |
| } |
| |
| |
| FT_CALLBACK_DEF( FT_Error ) |
| TT_Load_Simple_Glyph( TT_Loader load ) |
| { |
| FT_Error error; |
| FT_Byte* p = load->cursor; |
| FT_Byte* limit = load->limit; |
| FT_GlyphLoader gloader = load->gloader; |
| FT_Int n_contours = load->n_contours; |
| FT_Outline* outline; |
| TT_Face face = (TT_Face)load->face; |
| FT_UShort n_ins; |
| FT_Int n_points; |
| |
| FT_Byte *flag, *flag_limit; |
| FT_Byte c, count; |
| FT_Vector *vec, *vec_limit; |
| FT_Pos x; |
| FT_Short *cont, *cont_limit, prev_cont; |
| FT_Int xy_size = 0; |
| |
| |
| /* check that we can add the contours to the glyph */ |
| error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours ); |
| if ( error ) |
| goto Fail; |
| |
| /* reading the contours' endpoints & number of points */ |
| cont = gloader->current.outline.contours; |
| cont_limit = cont + n_contours; |
| |
| /* check space for contours array + instructions count */ |
| if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit ) |
| goto Invalid_Outline; |
| |
| cont[0] = prev_cont = FT_NEXT_USHORT( p ); |
| for ( cont++; cont < cont_limit; cont++ ) |
| { |
| cont[0] = FT_NEXT_USHORT( p ); |
| if ( cont[0] <= prev_cont ) |
| { |
| /* unordered contours: this is invalid */ |
| error = FT_Err_Invalid_Table; |
| goto Fail; |
| } |
| prev_cont = cont[0]; |
| } |
| |
| n_points = 0; |
| if ( n_contours > 0 ) |
| { |
| n_points = cont[-1] + 1; |
| if ( n_points < 0 ) |
| goto Invalid_Outline; |
| } |
| |
| /* note that we will add four phantom points later */ |
| error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 ); |
| if ( error ) |
| goto Fail; |
| |
| /* we'd better check the contours table right now */ |
| outline = &gloader->current.outline; |
| |
| for ( cont = outline->contours + 1; cont < cont_limit; cont++ ) |
| if ( cont[-1] >= cont[0] ) |
| goto Invalid_Outline; |
| |
| /* reading the bytecode instructions */ |
| load->glyph->control_len = 0; |
| load->glyph->control_data = 0; |
| |
| if ( p + 2 > limit ) |
| goto Invalid_Outline; |
| |
| n_ins = FT_NEXT_USHORT( p ); |
| |
| FT_TRACE5(( " Instructions size: %u\n", n_ins )); |
| |
| if ( n_ins > face->max_profile.maxSizeOfInstructions ) |
| { |
| FT_TRACE0(( "TT_Load_Simple_Glyph: Too many instructions (%d)\n", |
| n_ins )); |
| error = TT_Err_Too_Many_Hints; |
| goto Fail; |
| } |
| |
| if ( ( limit - p ) < n_ins ) |
| { |
| FT_TRACE0(( "TT_Load_Simple_Glyph: Instruction count mismatch!\n" )); |
| error = TT_Err_Too_Many_Hints; |
| goto Fail; |
| } |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| if ( IS_HINTED( load->load_flags ) ) |
| { |
| load->glyph->control_len = n_ins; |
| load->glyph->control_data = load->exec->glyphIns; |
| |
| FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins ); |
| } |
| |
| #endif /* TT_USE_BYTECODE_INTERPRETER */ |
| |
| p += n_ins; |
| |
| /* reading the point tags */ |
| flag = (FT_Byte*)outline->tags; |
| flag_limit = flag + n_points; |
| |
| FT_ASSERT( flag != NULL ); |
| |
| while ( flag < flag_limit ) |
| { |
| if ( p + 1 > limit ) |
| goto Invalid_Outline; |
| |
| *flag++ = c = FT_NEXT_BYTE( p ); |
| if ( c & 8 ) |
| { |
| if ( p + 1 > limit ) |
| goto Invalid_Outline; |
| |
| count = FT_NEXT_BYTE( p ); |
| if ( flag + (FT_Int)count > flag_limit ) |
| goto Invalid_Outline; |
| |
| for ( ; count > 0; count-- ) |
| *flag++ = c; |
| } |
| } |
| |
| /* reading the X coordinates */ |
| |
| vec = outline->points; |
| vec_limit = vec + n_points; |
| flag = (FT_Byte*)outline->tags; |
| x = 0; |
| |
| if ( p + xy_size > limit ) |
| goto Invalid_Outline; |
| |
| for ( ; vec < vec_limit; vec++, flag++ ) |
| { |
| FT_Pos y = 0; |
| FT_Byte f = *flag; |
| |
| |
| if ( f & 2 ) |
| { |
| if ( p + 1 > limit ) |
| goto Invalid_Outline; |
| |
| y = (FT_Pos)FT_NEXT_BYTE( p ); |
| if ( ( f & 16 ) == 0 ) |
| y = -y; |
| } |
| else if ( ( f & 16 ) == 0 ) |
| { |
| if ( p + 2 > limit ) |
| goto Invalid_Outline; |
| |
| y = (FT_Pos)FT_NEXT_SHORT( p ); |
| } |
| |
| x += y; |
| vec->x = x; |
| *flag = f & ~( 2 | 16 ); |
| } |
| |
| /* reading the Y coordinates */ |
| |
| vec = gloader->current.outline.points; |
| vec_limit = vec + n_points; |
| flag = (FT_Byte*)outline->tags; |
| x = 0; |
| |
| for ( ; vec < vec_limit; vec++, flag++ ) |
| { |
| FT_Pos y = 0; |
| FT_Byte f = *flag; |
| |
| |
| if ( f & 4 ) |
| { |
| if ( p + 1 > limit ) |
| goto Invalid_Outline; |
| |
| y = (FT_Pos)FT_NEXT_BYTE( p ); |
| if ( ( f & 32 ) == 0 ) |
| y = -y; |
| } |
| else if ( ( f & 32 ) == 0 ) |
| { |
| if ( p + 2 > limit ) |
| goto Invalid_Outline; |
| |
| y = (FT_Pos)FT_NEXT_SHORT( p ); |
| } |
| |
| x += y; |
| vec->y = x; |
| *flag = f & FT_CURVE_TAG_ON; |
| } |
| |
| outline->n_points = (FT_UShort)n_points; |
| outline->n_contours = (FT_Short) n_contours; |
| |
| load->cursor = p; |
| |
| 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_Byte* p = loader->cursor; |
| FT_Byte* limit = loader->limit; |
| FT_GlyphLoader gloader = loader->gloader; |
| FT_SubGlyph subglyph; |
| FT_UInt num_subglyphs; |
| |
| |
| num_subglyphs = 0; |
| |
| do |
| { |
| FT_Fixed xx, xy, yy, yx; |
| FT_UInt count; |
| |
| |
| /* check that we can load a new subglyph */ |
| error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); |
| if ( error ) |
| goto Fail; |
| |
| /* check space */ |
| if ( p + 4 > limit ) |
| goto Invalid_Composite; |
| |
| subglyph = gloader->current.subglyphs + num_subglyphs; |
| |
| subglyph->arg1 = subglyph->arg2 = 0; |
| |
| subglyph->flags = FT_NEXT_USHORT( p ); |
| subglyph->index = FT_NEXT_USHORT( p ); |
| |
| /* check space */ |
| count = 2; |
| if ( subglyph->flags & ARGS_ARE_WORDS ) |
| count += 2; |
| if ( subglyph->flags & WE_HAVE_A_SCALE ) |
| count += 2; |
| else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) |
| count += 4; |
| else if ( subglyph->flags & WE_HAVE_A_2X2 ) |
| count += 8; |
| |
| if ( p + count > limit ) |
| goto Invalid_Composite; |
| |
| /* read arguments */ |
| if ( subglyph->flags & ARGS_ARE_WORDS ) |
| { |
| subglyph->arg1 = FT_NEXT_SHORT( p ); |
| subglyph->arg2 = FT_NEXT_SHORT( p ); |
| } |
| else |
| { |
| subglyph->arg1 = FT_NEXT_CHAR( p ); |
| subglyph->arg2 = FT_NEXT_CHAR( p ); |
| } |
| |
| /* read transform */ |
| xx = yy = 0x10000L; |
| xy = yx = 0; |
| |
| if ( subglyph->flags & WE_HAVE_A_SCALE ) |
| { |
| xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; |
| yy = xx; |
| } |
| else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) |
| { |
| xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; |
| yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; |
| } |
| else if ( subglyph->flags & WE_HAVE_A_2X2 ) |
| { |
| xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; |
| yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; |
| xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; |
| yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 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_USE_BYTECODE_INTERPRETER |
| |
| { |
| FT_Stream stream = loader->stream; |
| |
| |
| /* 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() + |
| p - limit ); |
| } |
| |
| #endif |
| |
| loader->cursor = p; |
| |
| 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; |
| } |
| |
| |
| 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->orus = load->extra_points2 + start_point; |
| zone->tags = (FT_Byte*)load->outline.tags + start_point; |
| zone->contours = (FT_UShort*)load->outline.contours + start_contour; |
| zone->first_point = (FT_UShort)start_point; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* TT_Hint_Glyph */ |
| /* */ |
| /* <Description> */ |
| /* Hint the glyph using the zone prepared by the caller. Note that */ |
| /* the zone is supposed to include four phantom points. */ |
| /* */ |
| static FT_Error |
| TT_Hint_Glyph( TT_Loader loader, |
| FT_Bool is_composite ) |
| { |
| TT_GlyphZone zone = &loader->zone; |
| FT_Pos origin; |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| FT_UInt n_ins; |
| #else |
| FT_UNUSED( is_composite ); |
| #endif |
| |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| n_ins = loader->glyph->control_len; |
| #endif |
| |
| origin = zone->cur[zone->n_points - 4].x; |
| origin = FT_PIX_ROUND( origin ) - origin; |
| if ( origin ) |
| translate_array( zone->n_points, zone->cur, origin, 0 ); |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| /* save original point position in org */ |
| if ( n_ins > 0 ) |
| FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); |
| #endif |
| |
| /* round pp2 and pp4 */ |
| zone->cur[zone->n_points - 3].x = |
| FT_PIX_ROUND( zone->cur[zone->n_points - 3].x ); |
| zone->cur[zone->n_points - 1].y = |
| FT_PIX_ROUND( zone->cur[zone->n_points - 1].y ); |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| if ( n_ins > 0 ) |
| { |
| FT_Bool debug; |
| FT_Error error; |
| |
| |
| error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph, |
| loader->exec->glyphIns, n_ins ); |
| if ( error ) |
| return error; |
| |
| loader->exec->is_composite = is_composite; |
| loader->exec->pts = *zone; |
| |
| debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) && |
| ((TT_Size)loader->size)->debug ); |
| |
| error = TT_Run_Context( loader->exec, debug ); |
| if ( error && loader->exec->pedantic_hinting ) |
| return error; |
| } |
| |
| #endif |
| |
| /* save glyph phantom points */ |
| if ( !loader->preserve_pps ) |
| { |
| loader->pp1 = zone->cur[zone->n_points - 4]; |
| loader->pp2 = zone->cur[zone->n_points - 3]; |
| loader->pp3 = zone->cur[zone->n_points - 2]; |
| loader->pp4 = zone->cur[zone->n_points - 1]; |
| } |
| |
| return TT_Err_Ok; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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 loader ) |
| { |
| FT_GlyphLoader gloader = loader->gloader; |
| FT_Error error = TT_Err_Ok; |
| FT_Outline* outline; |
| FT_UInt n_points; |
| |
| |
| outline = &gloader->current.outline; |
| n_points = outline->n_points; |
| |
| /* set phantom points */ |
| |
| outline->points[n_points ] = loader->pp1; |
| outline->points[n_points + 1] = loader->pp2; |
| outline->points[n_points + 2] = loader->pp3; |
| outline->points[n_points + 3] = loader->pp4; |
| |
| outline->tags[n_points ] = 0; |
| outline->tags[n_points + 1] = 0; |
| outline->tags[n_points + 2] = 0; |
| outline->tags[n_points + 3] = 0; |
| |
| n_points += 4; |
| |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| |
| if ( ((TT_Face)loader->face)->doblend ) |
| { |
| /* Deltas apply to the unscaled data. */ |
| FT_Vector* deltas; |
| FT_Memory memory = loader->face->memory; |
| FT_UInt i; |
| |
| |
| error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), |
| loader->glyph_index, |
| &deltas, |
| n_points ); |
| if ( error ) |
| return error; |
| |
| for ( i = 0; i < n_points; ++i ) |
| { |
| outline->points[i].x += deltas[i].x; |
| outline->points[i].y += deltas[i].y; |
| } |
| |
| FT_FREE( deltas ); |
| } |
| |
| #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ |
| |
| if ( IS_HINTED( loader->load_flags ) ) |
| { |
| tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 ); |
| |
| FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur, |
| loader->zone.n_points + 4 ); |
| } |
| |
| /* scale the glyph */ |
| if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) |
| { |
| FT_Vector* vec = outline->points; |
| FT_Vector* limit = outline->points + n_points; |
| FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; |
| FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; |
| |
| |
| for ( ; vec < limit; vec++ ) |
| { |
| vec->x = FT_MulFix( vec->x, x_scale ); |
| vec->y = FT_MulFix( vec->y, y_scale ); |
| } |
| |
| loader->pp1 = outline->points[n_points - 4]; |
| loader->pp2 = outline->points[n_points - 3]; |
| loader->pp3 = outline->points[n_points - 2]; |
| loader->pp4 = outline->points[n_points - 1]; |
| } |
| |
| if ( IS_HINTED( loader->load_flags ) ) |
| { |
| loader->zone.n_points += 4; |
| |
| error = TT_Hint_Glyph( loader, 0 ); |
| } |
| |
| return error; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* TT_Process_Composite_Component */ |
| /* */ |
| /* <Description> */ |
| /* Once a composite component has been loaded, it needs to be */ |
| /* processed. Usually, this means transforming and translating. */ |
| /* */ |
| static FT_Error |
| TT_Process_Composite_Component( TT_Loader loader, |
| FT_SubGlyph subglyph, |
| FT_UInt start_point, |
| FT_UInt num_base_points ) |
| { |
| FT_GlyphLoader gloader = loader->gloader; |
| FT_Vector* base_vec = gloader->base.outline.points; |
| FT_UInt num_points = gloader->base.outline.n_points; |
| FT_Bool have_scale; |
| FT_Pos x, y; |
| |
| |
| have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE | |
| WE_HAVE_AN_XY_SCALE | |
| WE_HAVE_A_2X2 ) ); |
| |
| /* perform the transform required for this subglyph */ |
| if ( have_scale ) |
| { |
| FT_UInt i; |
| |
| |
| for ( i = num_base_points; i < num_points; i++ ) |
| FT_Vector_Transform( base_vec + i, &subglyph->transform ); |
| } |
| |
| /* get offset */ |
| if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) |
| { |
| FT_UInt k = subglyph->arg1; |
| FT_UInt l = subglyph->arg2; |
| FT_Vector* p1; |
| FT_Vector* p2; |
| |
| |
| /* match l-th point of the newly loaded component to the k-th point */ |
| /* of the previously loaded components. */ |
| |
| /* change to the point numbers used by our outline */ |
| k += start_point; |
| l += num_base_points; |
| if ( k >= num_base_points || |
| l >= num_points ) |
| return TT_Err_Invalid_Composite; |
| |
| p1 = gloader->base.outline.points + k; |
| p2 = gloader->base.outline.points + l; |
| |
| x = p1->x - p2->x; |
| y = p1->y - p2->y; |
| } |
| else |
| { |
| x = subglyph->arg1; |
| y = subglyph->arg2; |
| |
| if ( !x && !y ) |
| return TT_Err_Ok; |
| |
| /* Use a default value dependent on */ |
| /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */ |
| /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */ |
| |
| if ( have_scale && |
| #ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED |
| !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) ) |
| #else |
| ( subglyph->flags & SCALED_COMPONENT_OFFSET ) ) |
| #endif |
| { |
| |
| #if 0 |
| |
| /*************************************************************************/ |
| /* */ |
| /* This algorithm is what Apple documents. But it doesn't work. */ |
| /* */ |
| int a = subglyph->transform.xx > 0 ? subglyph->transform.xx |
| : -subglyph->transform.xx; |
| int b = subglyph->transform.yx > 0 ? subglyph->transform.yx |
| : -subglyph->transform.yx; |
| int c = subglyph->transform.xy > 0 ? subglyph->transform.xy |
| : -subglyph->transform.xy; |
| int d = subglyph->transform.yy > 0 ? subglyph->transform.yy |
| : -subglyph->transform.yy; |
| int m = a > b ? a : b; |
| int n = c > d ? c : d; |
| |
| |
| if ( a - b <= 33 && a - b >= -33 ) |
| m *= 2; |
| if ( c - d <= 33 && c - d >= -33 ) |
| n *= 2; |
| x = FT_MulFix( x, m ); |
| y = FT_MulFix( y, n ); |
| |
| #else /* 0 */ |
| |
| /*************************************************************************/ |
| /* */ |
| /* This algorithm is a guess and works much better than the above. */ |
| /* */ |
| FT_Fixed mac_xscale = FT_SqrtFixed( |
| FT_MulFix( subglyph->transform.xx, |
| subglyph->transform.xx ) + |
| FT_MulFix( subglyph->transform.xy, |
| subglyph->transform.xy ) ); |
| FT_Fixed mac_yscale = FT_SqrtFixed( |
| FT_MulFix( subglyph->transform.yy, |
| subglyph->transform.yy ) + |
| FT_MulFix( subglyph->transform.yx, |
| subglyph->transform.yx ) ); |
| |
| |
| x = FT_MulFix( x, mac_xscale ); |
| y = FT_MulFix( y, mac_yscale ); |
| |
| #endif /* 0 */ |
| |
| } |
| |
| if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) |
| { |
| FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; |
| FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; |
| |
| |
| x = FT_MulFix( x, x_scale ); |
| y = FT_MulFix( y, y_scale ); |
| |
| if ( subglyph->flags & ROUND_XY_TO_GRID ) |
| { |
| x = FT_PIX_ROUND( x ); |
| y = FT_PIX_ROUND( y ); |
| } |
| } |
| } |
| |
| if ( x || y ) |
| translate_array( num_points - num_base_points, |
| base_vec + num_base_points, |
| x, y ); |
| |
| return TT_Err_Ok; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* TT_Process_Composite_Glyph */ |
| /* */ |
| /* <Description> */ |
| /* This is slightly different from TT_Process_Simple_Glyph, in that */ |
| /* its sole purpose is to hint the glyph. Thus this function is */ |
| /* only available when bytecode interpreter is enabled. */ |
| /* */ |
| static FT_Error |
| TT_Process_Composite_Glyph( TT_Loader loader, |
| FT_UInt start_point, |
| FT_UInt start_contour ) |
| { |
| FT_Error error; |
| FT_Outline* outline; |
| FT_UInt i; |
| |
| |
| outline = &loader->gloader->base.outline; |
| |
| /* make room for phantom points */ |
| error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader, |
| outline->n_points + 4, |
| 0 ); |
| if ( error ) |
| return error; |
| |
| outline->points[outline->n_points ] = loader->pp1; |
| outline->points[outline->n_points + 1] = loader->pp2; |
| outline->points[outline->n_points + 2] = loader->pp3; |
| outline->points[outline->n_points + 3] = loader->pp4; |
| |
| outline->tags[outline->n_points ] = 0; |
| outline->tags[outline->n_points + 1] = 0; |
| outline->tags[outline->n_points + 2] = 0; |
| outline->tags[outline->n_points + 3] = 0; |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| { |
| FT_Stream stream = loader->stream; |
| FT_UShort n_ins; |
| |
| |
| /* TT_Load_Composite_Glyph only gives us the offset of instructions */ |
| /* so we read them here */ |
| if ( FT_STREAM_SEEK( loader->ins_pos ) || |
| FT_READ_USHORT( n_ins ) ) |
| return error; |
| |
| FT_TRACE5(( " Instructions size = %d\n", n_ins )); |
| |
| /* check it */ |
| if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions ) |
| { |
| FT_TRACE0(( "TT_Process_Composite_Glyph: Too many instructions (%d)\n", |
| n_ins )); |
| |
| return TT_Err_Too_Many_Hints; |
| } |
| else if ( n_ins == 0 ) |
| return TT_Err_Ok; |
| |
| if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) ) |
| return error; |
| |
| loader->glyph->control_data = loader->exec->glyphIns; |
| loader->glyph->control_len = n_ins; |
| } |
| |
| #endif |
| |
| tt_prepare_zone( &loader->zone, &loader->gloader->base, |
| start_point, start_contour ); |
| |
| /* Some points are likely touched during execution of */ |
| /* instructions on components. So let's untouch them. */ |
| for ( i = start_point; i < loader->zone.n_points; i++ ) |
| loader->zone.tags[i] &= ~( FT_CURVE_TAG_TOUCH_X | |
| FT_CURVE_TAG_TOUCH_Y ); |
| |
| loader->zone.n_points += 4; |
| |
| return TT_Hint_Glyph( loader, 1 ); |
| } |
| |
| |
| /* Calculate the four phantom points. */ |
| /* The first two stand for horizontal origin and advance. */ |
| /* The last two stand for vertical origin and advance. */ |
| #define TT_LOADER_SET_PP( loader ) \ |
| do { \ |
| (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; \ |
| (loader)->pp3.x = 0; \ |
| (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \ |
| (loader)->pp4.x = 0; \ |
| (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \ |
| } while ( 0 ) |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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, |
| FT_UInt recurse_count ) |
| { |
| FT_Error error; |
| FT_Fixed x_scale, y_scale; |
| FT_ULong offset; |
| TT_Face face = (TT_Face)loader->face; |
| FT_GlyphLoader gloader = loader->gloader; |
| FT_Bool opened_frame = 0; |
| |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| FT_Vector* deltas = NULL; |
| #endif |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| FT_StreamRec inc_stream; |
| FT_Data glyph_data; |
| FT_Bool glyph_data_loaded = 0; |
| #endif |
| |
| |
| if ( recurse_count > face->max_profile.maxComponentDepth ) |
| { |
| error = TT_Err_Invalid_Composite; |
| goto Exit; |
| } |
| |
| /* check glyph index */ |
| if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) |
| { |
| error = TT_Err_Invalid_Glyph_Index; |
| goto Exit; |
| } |
| |
| loader->glyph_index = glyph_index; |
| |
| if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) |
| { |
| x_scale = ((TT_Size)loader->size)->metrics.x_scale; |
| y_scale = ((TT_Size)loader->size)->metrics.y_scale; |
| } |
| else |
| { |
| x_scale = 0x10000L; |
| y_scale = 0x10000L; |
| } |
| |
| /* get metrics, horizontal and vertical */ |
| { |
| FT_Short left_bearing = 0, top_bearing = 0; |
| FT_UShort advance_width = 0, advance_height = 0; |
| |
| |
| Get_HMetrics( face, glyph_index, |
| (FT_Bool)!( loader->load_flags & |
| FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), |
| &left_bearing, |
| &advance_width ); |
| Get_VMetrics( face, glyph_index, |
| (FT_Bool)!( loader->load_flags & |
| FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), |
| &top_bearing, |
| &advance_height ); |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| |
| /* If this is an incrementally loaded font see if there are */ |
| /* overriding metrics for this glyph. */ |
| if ( face->root.internal->incremental_interface && |
| face->root.internal->incremental_interface->funcs->get_glyph_metrics ) |
| { |
| FT_Incremental_MetricsRec metrics; |
| |
| |
| metrics.bearing_x = left_bearing; |
| metrics.bearing_y = 0; |
| metrics.advance = advance_width; |
| error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( |
| face->root.internal->incremental_interface->object, |
| glyph_index, FALSE, &metrics ); |
| if ( error ) |
| goto Exit; |
| left_bearing = (FT_Short)metrics.bearing_x; |
| advance_width = (FT_UShort)metrics.advance; |
| |
| #if 0 |
| |
| /* GWW: Do I do the same for vertical metrics? */ |
| metrics.bearing_x = 0; |
| metrics.bearing_y = top_bearing; |
| metrics.advance = advance_height; |
| error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( |
| face->root.internal->incremental_interface->object, |
| glyph_index, TRUE, &metrics ); |
| if ( error ) |
| goto Exit; |
| top_bearing = (FT_Short)metrics.bearing_y; |
| advance_height = (FT_UShort)metrics.advance; |
| |
| #endif /* 0 */ |
| |
| } |
| |
| #endif /* FT_CONFIG_OPTION_INCREMENTAL */ |
| |
| loader->left_bearing = left_bearing; |
| loader->advance = advance_width; |
| loader->top_bearing = top_bearing; |
| loader->vadvance = advance_height; |
| |
| if ( !loader->linear_def ) |
| { |
| loader->linear_def = 1; |
| loader->linear = advance_width; |
| } |
| } |
| |
| /* Set `offset' to the start of the glyph relative to the start of */ |
| /* the `glyf' table, and `byte_len' to the length of the glyph in */ |
| /* bytes. */ |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| |
| /* If we are loading glyph data via the incremental interface, set */ |
| /* the loader stream to a memory stream reading the data returned */ |
| /* by the interface. */ |
| if ( face->root.internal->incremental_interface ) |
| { |
| error = face->root.internal->incremental_interface->funcs->get_glyph_data( |
| face->root.internal->incremental_interface->object, |
| glyph_index, &glyph_data ); |
| if ( error ) |
| goto Exit; |
| |
| glyph_data_loaded = 1; |
| offset = 0; |
| loader->byte_len = glyph_data.length; |
| |
| FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); |
| FT_Stream_OpenMemory( &inc_stream, |
| glyph_data.pointer, glyph_data.length ); |
| |
| loader->stream = &inc_stream; |
| } |
| else |
| |
| #endif /* FT_CONFIG_OPTION_INCREMENTAL */ |
| |
| offset = tt_face_get_location( face, glyph_index, |
| (FT_UInt*)&loader->byte_len ); |
| |
| if ( loader->byte_len == 0 ) |
| { |
| /* as described by Frederic Loyer, these are spaces or */ |
| /* the unknown glyph. */ |
| loader->bbox.xMin = 0; |
| loader->bbox.xMax = 0; |
| loader->bbox.yMin = 0; |
| loader->bbox.yMax = 0; |
| |
| TT_LOADER_SET_PP( loader ); |
| |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| |
| if ( ((TT_Face)(loader->face))->doblend ) |
| { |
| /* this must be done before scaling */ |
| FT_Memory memory = loader->face->memory; |
| |
| |
| error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), |
| glyph_index, &deltas, 4 ); |
| if ( error ) |
| goto Exit; |
| |
| loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y; |
| loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y; |
| loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y; |
| loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y; |
| |
| FT_FREE( deltas ); |
| } |
| |
| #endif |
| |
| 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 ); |
| loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); |
| loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); |
| } |
| |
| error = TT_Err_Ok; |
| goto Exit; |
| } |
| |
| error = face->access_glyph_frame( loader, glyph_index, |
| loader->glyf_offset + offset, |
| loader->byte_len ); |
| if ( error ) |
| goto Exit; |
| |
| opened_frame = 1; |
| |
| /* read first glyph header */ |
| error = face->read_glyph_header( loader ); |
| if ( error ) |
| goto Exit; |
| |
| TT_LOADER_SET_PP( loader ); |
| |
| /***********************************************************************/ |
| /***********************************************************************/ |
| /***********************************************************************/ |
| |
| /* if it is a simple glyph, load it */ |
| |
| if ( loader->n_contours >= 0 ) |
| { |
| error = face->read_simple_glyph( loader ); |
| if ( error ) |
| goto Exit; |
| |
| /* all data have been read */ |
| face->forget_glyph_frame( loader ); |
| opened_frame = 0; |
| |
| error = TT_Process_Simple_Glyph( loader ); |
| if ( error ) |
| goto Exit; |
| |
| FT_GlyphLoader_Add( gloader ); |
| } |
| |
| /***********************************************************************/ |
| /***********************************************************************/ |
| /***********************************************************************/ |
| |
| /* otherwise, load a composite! */ |
| else if ( loader->n_contours == -1 ) |
| { |
| FT_UInt start_point; |
| FT_UInt start_contour; |
| FT_ULong ins_pos; /* position of composite instructions, if any */ |
| |
| |
| start_point = gloader->base.outline.n_points; |
| start_contour = gloader->base.outline.n_contours; |
| |
| /* for each subglyph, read composite header */ |
| error = face->read_composite_glyph( loader ); |
| if ( error ) |
| goto Exit; |
| |
| /* store the offset of instructions */ |
| ins_pos = loader->ins_pos; |
| |
| /* all data we need are read */ |
| face->forget_glyph_frame( loader ); |
| opened_frame = 0; |
| |
| #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT |
| |
| if ( face->doblend ) |
| { |
| FT_Int i, limit; |
| FT_SubGlyph subglyph; |
| FT_Memory memory = face->root.memory; |
| |
| |
| /* this provides additional offsets */ |
| /* for each component's translation */ |
| |
| if ( ( error = TT_Vary_Get_Glyph_Deltas( |
| face, |
| glyph_index, |
| &deltas, |
| gloader->current.num_subglyphs + 4 )) != 0 ) |
| goto Exit; |
| |
| subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs; |
| limit = gloader->current.num_subglyphs; |
| |
| for ( i = 0; i < limit; ++i, ++subglyph ) |
| { |
| if ( subglyph->flags & ARGS_ARE_XY_VALUES ) |
| { |
| subglyph->arg1 += deltas[i].x; |
| subglyph->arg2 += deltas[i].y; |
| } |
| } |
| |
| loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y; |
| loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y; |
| loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y; |
| loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y; |
| |
| FT_FREE( deltas ); |
| } |
| |
| #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ |
| |
| 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 ); |
| loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); |
| loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); |
| } |
| |
| /* 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 these data)... */ |
| if ( loader->load_flags & FT_LOAD_NO_RECURSE ) |
| { |
| FT_GlyphLoader_Add( gloader ); |
| loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE; |
| |
| goto Exit; |
| } |
| |
| /*********************************************************************/ |
| /*********************************************************************/ |
| /*********************************************************************/ |
| |
| { |
| FT_UInt n, num_base_points; |
| FT_SubGlyph subglyph = 0; |
| |
| FT_UInt num_points = start_point; |
| FT_UInt num_subglyphs = gloader->current.num_subglyphs; |
| FT_UInt num_base_subgs = gloader->base.num_subglyphs; |
| |
| FT_Stream old_stream = loader->stream; |
| |
| TT_GraphicsState saved_GS; |
| |
| |
| if ( loader->exec ) |
| saved_GS = loader->exec->GS; |
| |
| FT_GlyphLoader_Add( gloader ); |
| |
| /* read each subglyph independently */ |
| for ( n = 0; n < num_subglyphs; n++ ) |
| { |
| FT_Vector pp[4]; |
| |
| |
| /* reinitialize graphics state */ |
| if ( loader->exec ) |
| loader->exec->GS = saved_GS; |
| |
| /* 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; |
| |
| pp[0] = loader->pp1; |
| pp[1] = loader->pp2; |
| pp[2] = loader->pp3; |
| pp[3] = loader->pp4; |
| |
| num_base_points = gloader->base.outline.n_points; |
| |
| error = load_truetype_glyph( loader, subglyph->index, |
| recurse_count + 1 ); |
| if ( error ) |
| goto Exit; |
| |
| /* restore subglyph pointer */ |
| subglyph = gloader->base.subglyphs + num_base_subgs + n; |
| |
| if ( !( subglyph->flags & USE_MY_METRICS ) ) |
| { |
| loader->pp1 = pp[0]; |
| loader->pp2 = pp[1]; |
| loader->pp3 = pp[2]; |
| loader->pp4 = pp[3]; |
| } |
| |
| num_points = gloader->base.outline.n_points; |
| |
| if ( num_points == num_base_points ) |
| continue; |
| |
| /* gloader->base.outline consists of three parts: */ |
| /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ |
| /* */ |
| /* (1): exists from the beginning */ |
| /* (2): components that have been loaded so far */ |
| /* (3): the newly loaded component */ |
| TT_Process_Composite_Component( loader, subglyph, start_point, |
| num_base_points ); |
| } |
| |
| loader->stream = old_stream; |
| |
| /* process the glyph */ |
| loader->ins_pos = ins_pos; |
| if ( IS_HINTED( loader->load_flags ) && |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| subglyph->flags & WE_HAVE_INSTR && |
| |
| #endif |
| |
| num_points > start_point ) |
| TT_Process_Composite_Glyph( loader, start_point, start_contour ); |
| |
| } |
| } |
| else |
| { |
| /* invalid composite count (negative but not -1) */ |
| error = TT_Err_Invalid_Outline; |
| goto Exit; |
| } |
| |
| /***********************************************************************/ |
| /***********************************************************************/ |
| /***********************************************************************/ |
| |
| Exit: |
| |
| if ( opened_frame ) |
| face->forget_glyph_frame( loader ); |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| |
| if ( glyph_data_loaded ) |
| face->root.internal->incremental_interface->funcs->free_glyph_data( |
| face->root.internal->incremental_interface->object, |
| &glyph_data ); |
| |
| #endif |
| |
| return error; |
| } |
| |
| |
| static FT_Error |
| 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 ) |
| FT_Outline_Get_CBox( &glyph->outline, &bbox ); |
| 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; |
| |
| /* 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_Pos top; /* scaled vertical top side bearing */ |
| FT_Pos advance; /* scaled vertical advance height */ |
| |
| |
| /* Get the unscaled top bearing and advance height. */ |
| if ( face->vertical_info && |
| face->vertical.number_Of_VMetrics > 0 ) |
| { |
| top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax, |
| y_scale ); |
| |
| if ( loader->pp3.y <= loader->pp4.y ) |
| advance = 0; |
| else |
| advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y, |
| y_scale ); |
| } |
| else |
| { |
| FT_Pos height; |
| |
| |
| /* XXX Compute top side bearing and advance height in */ |
| /* Get_VMetrics instead of here. */ |
| |
| /* 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. */ |
| |
| height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin, |
| y_scale ); |
| if ( face->os2.version != 0xFFFFU ) |
| advance = (FT_Pos)( face->os2.sTypoAscender - |
| face->os2.sTypoDescender ); |
| else |
| advance = (FT_Pos)( face->horizontal.Ascender - |
| face->horizontal.Descender ); |
| |
| top = ( advance - height ) / 2; |
| } |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| { |
| FT_Incremental_InterfaceRec* incr; |
| FT_Incremental_MetricsRec metrics; |
| FT_Error error; |
| |
| |
| incr = face->root.internal->incremental_interface; |
| |
| /* If this is an incrementally loaded font see if there are */ |
| /* overriding metrics for this glyph. */ |
| if ( incr && incr->funcs->get_glyph_metrics ) |
| { |
| metrics.bearing_x = 0; |
| metrics.bearing_y = top; |
| metrics.advance = advance; |
| |
| error = incr->funcs->get_glyph_metrics( incr->object, |
| glyph_index, |
| TRUE, |
| &metrics ); |
| if ( error ) |
| return error; |
| |
| top = metrics.bearing_y; |
| advance = metrics.advance; |
| } |
| } |
| |
| /* GWW: Do vertical metrics get loaded incrementally too? */ |
| |
| #endif /* FT_CONFIG_OPTION_INCREMENTAL */ |
| |
| glyph->linearVertAdvance = advance; |
| |
| /* scale the metrics */ |
| if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) |
| { |
| top = FT_MulFix( top, y_scale ); |
| advance = FT_MulFix( advance, y_scale ); |
| } |
| |
| /* XXX: for now, we have no better algorithm for the lsb, but it */ |
| /* should work fine. */ |
| /* */ |
| glyph->metrics.vertBearingX = ( bbox.xMin - bbox.xMax ) / 2; |
| glyph->metrics.vertBearingY = top; |
| glyph->metrics.vertAdvance = advance; |
| } |
| |
| /* adjust advance width to the value contained in the hdmx table */ |
| if ( !face->postscript.isFixedPitch && |
| IS_HINTED( loader->load_flags ) ) |
| { |
| FT_Byte* widthp; |
| |
| |
| widthp = tt_face_get_device_metrics( face, |
| size->root.metrics.x_ppem, |
| glyph_index ); |
| |
| if ( widthp ) |
| glyph->metrics.horiAdvance = *widthp << 6; |
| } |
| |
| /* set glyph dimensions */ |
| glyph->metrics.width = bbox.xMax - bbox.xMin; |
| glyph->metrics.height = bbox.yMax - bbox.yMin; |
| |
| return 0; |
| } |
| |
| |
| #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS |
| |
| static FT_Error |
| load_sbit_image( TT_Size size, |
| TT_GlyphSlot glyph, |
| FT_UInt glyph_index, |
| FT_Int32 load_flags ) |
| { |
| TT_Face face; |
| SFNT_Service sfnt; |
| FT_Stream stream; |
| FT_Error error; |
| TT_SBit_MetricsRec metrics; |
| |
| |
| face = (TT_Face)glyph->face; |
| sfnt = (SFNT_Service)face->sfnt; |
| stream = face->root.stream; |
| |
| error = sfnt->load_sbit_image( face, |
| size->strike_index, |
| glyph_index, |
| (FT_Int)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 */ |
| |
| |
| static FT_Error |
| tt_loader_init( TT_Loader loader, |
| TT_Size size, |
| TT_GlyphSlot glyph, |
| FT_Int32 load_flags ) |
| { |
| TT_Face face; |
| FT_Stream stream; |
| |
| |
| face = (TT_Face)glyph->face; |
| stream = face->root.stream; |
| |
| FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) ); |
| |
| #ifdef TT_USE_BYTECODE_INTERPRETER |
| |
| /* load execution context */ |
| if ( IS_HINTED( load_flags ) ) |
| { |
| TT_ExecContext exec; |
| FT_Bool grayscale; |
| |
| |
| if ( !size->cvt_ready ) |
| { |
| FT_Error error = tt_size_ready_bytecode( size ); |
| if ( error ) |
| return error; |
| } |
| |
| /* query new execution context */ |
| exec = size->debug ? size->context |
| : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context; |
| if ( !exec ) |
| return TT_Err_Could_Not_Find_Context; |
| |
| grayscale = |
| FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO ); |
| |
| TT_Load_Context( exec, face, size ); |
| |
| /* a change from mono to grayscale rendering (and vice versa) */ |
| /* requires a re-execution of the CVT program */ |
| if ( grayscale != exec->grayscale ) |
| { |
| FT_UInt i; |
| |
| |
| exec->grayscale = grayscale; |
| |
| for ( i = 0; i < size->cvt_size; i++ ) |
| size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); |
| tt_size_run_prep( size ); |
| } |
| |
| /* see whether the cvt program has disabled hinting */ |
| if ( exec->GS.instruct_control & 1 ) |
| load_flags |= FT_LOAD_NO_HINTING; |
| |
| /* load default graphics state -- if needed */ |
| if ( exec->GS.instruct_control & 2 ) |
| exec->GS = tt_default_graphics_state; |
| |
| exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); |
| loader->exec = exec; |
| loader->instructions = exec->glyphIns; |
| } |
| |
| #endif /* TT_USE_BYTECODE_INTERPRETER */ |
| |
| /* seek to the beginning of the glyph table -- for Type 42 fonts */ |
| /* the table might be accessed from a Postscript stream or something */ |
| /* else... */ |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| |
| if ( face->root.internal->incremental_interface ) |
| loader->glyf_offset = 0; |
| else |
| |
| #endif |
| |
| { |
| FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 ); |
| |
| |
| if ( error ) |
| { |
| FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); |
| return error; |
| } |
| loader->glyf_offset = FT_STREAM_POS(); |
| } |
| |
| /* get face's glyph loader */ |
| { |
| FT_GlyphLoader gloader = glyph->internal->loader; |
| |
| |
| FT_GlyphLoader_Rewind( gloader ); |
| loader->gloader = gloader; |
| } |
| |
| loader->load_flags = load_flags; |
| |
| loader->face = (FT_Face)face; |
| loader->size = (FT_Size)size; |
| loader->glyph = (FT_GlyphSlot)glyph; |
| loader->stream = stream; |
| |
| return TT_Err_Ok; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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_UInt glyph_index, |
| FT_Int32 load_flags ) |
| { |
| TT_Face face; |
| FT_Error error; |
| TT_LoaderRec loader; |
| |
| |
| face = (TT_Face)glyph->face; |
| error = TT_Err_Ok; |
| |
| #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->strike_index != 0xFFFFFFFFUL && |
| ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) |
| { |
| error = load_sbit_image( size, glyph, glyph_index, load_flags ); |
| if ( !error ) |
| return TT_Err_Ok; |
| } |
| |
| #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ |
| |
| /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */ |
| if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid ) |
| return TT_Err_Invalid_Size_Handle; |
| |
| if ( load_flags & FT_LOAD_SBITS_ONLY ) |
| return TT_Err_Invalid_Argument; |
| |
| error = tt_loader_init( &loader, size, glyph, load_flags ); |
| if ( error ) |
| return error; |
| |
| glyph->format = FT_GLYPH_FORMAT_OUTLINE; |
| glyph->num_subglyphs = 0; |
| glyph->outline.flags = 0; |
| |
| /* main loading loop */ |
| error = load_truetype_glyph( &loader, glyph_index, 0 ); |
| if ( !error ) |
| { |
| if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE ) |
| { |
| glyph->num_subglyphs = loader.gloader->base.num_subglyphs; |
| glyph->subglyphs = loader.gloader->base.subglyphs; |
| } |
| else |
| { |
| glyph->outline = loader.gloader->base.outline; |
| glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; |
| |
| /* In case bit 1 of the `flags' field in the `head' table isn't */ |
| /* set, translate array so that (0,0) is the glyph's origin. */ |
| if ( ( face->header.Flags & 2 ) == 0 && loader.pp1.x ) |
| FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 ); |
| } |
| |
| compute_glyph_metrics( &loader, glyph_index ); |
| } |
| |
| /* Set the `high precision' bit flag. */ |
| /* This is _critical_ to get correct output for monochrome */ |
| /* TrueType glyphs at all sizes using the bytecode interpreter. */ |
| /* */ |
| if ( !( load_flags & FT_LOAD_NO_SCALE ) && |
| size->root.metrics.y_ppem < 24 ) |
| glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; |
| |
| return error; |
| } |
| |
| |
| /* END */ |
