diff options
Diffstat (limited to 'nx-X11/extras/freetype2/src/truetype/ttgload.c')
-rw-r--r-- | nx-X11/extras/freetype2/src/truetype/ttgload.c | 2039 |
1 files changed, 2039 insertions, 0 deletions
diff --git a/nx-X11/extras/freetype2/src/truetype/ttgload.c b/nx-X11/extras/freetype2/src/truetype/ttgload.c new file mode 100644 index 000000000..9fc2d0380 --- /dev/null +++ b/nx-X11/extras/freetype2/src/truetype/ttgload.c @@ -0,0 +1,2039 @@ +/***************************************************************************/ +/* */ +/* ttgload.c */ +/* */ +/* TrueType Glyph Loader (body). */ +/* */ +/* Copyright 1996-2001, 2002, 2003, 2004 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" + +#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 + + +/* Maximum recursion depth we allow for composite glyphs. + * The TrueType spec doesn't say anything about recursion, + * so it isn't clear that recursion is allowed at all. But + * we'll be generous. + */ +#define TT_MAX_COMPOSITE_RECURSE 5 + + + + /*************************************************************************/ + /* */ + /* <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 ( k == 0 ) + { + *bearing = *advance = 0; + return; + } + + 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; + } + + + /*************************************************************************/ + /* */ + /* 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 ) + TT_Get_Metrics( (TT_HoriHeader *)&face->vertical, idx, tsb, ah ); + +#if 1 /* Emperically 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 + + } + + +#define cur_to_org( n, zone ) \ + FT_ARRAY_COPY( (zone)->org, (zone)->cur, (n) ) + +#define org_to_cur( n, zone ) \ + FT_ARRAY_COPY( (zone)->cur, (zone)->org, (n) ) + + + /*************************************************************************/ + /* */ + /* 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; + + FT_Byte *flag, *flag_limit; + FT_Byte c, count; + FT_Vector *vec, *vec_limit; + FT_Pos x; + FT_Short *cont, *cont_limit; + + + /* reading the contours' endpoints & number of points */ + cont = gloader->current.outline.contours; + cont_limit = cont + n_contours; + + /* check space for contours array + instructions count */ + byte_len -= 2 * ( n_contours + 1 ); + if ( byte_len < 0 ) + goto Invalid_Outline; + + for ( ; cont < cont_limit; cont++ ) + cont[0] = FT_GET_USHORT(); + + n_points = 0; + if ( n_contours > 0 ) + n_points = cont[-1] + 1; + + error = FT_GlyphLoader_CheckPoints( 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 */ + slot->control_len = 0; + slot->control_data = 0; + + n_ins = FT_GET_USHORT(); + + FT_TRACE5(( " Instructions size: %u\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 -= (FT_Int)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, (FT_Long)n_ins ); + } + +#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ + + stream->cursor += (FT_Int)n_ins; + + /* reading the point tags */ + flag = (FT_Byte*)outline->tags; + flag_limit = flag + n_points; + + while ( flag < 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 + (FT_Int)count > flag_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 < 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 */ + + vec = outline->points; + vec_limit = vec + n_points; + flag = (FT_Byte*)outline->tags; + x = 0; + + for ( ; vec < vec_limit; vec++, flag++ ) + { + FT_Pos y = 0; + + + if ( *flag & 2 ) + { + y = (FT_Pos)FT_GET_BYTE(); + if ( ( *flag & 16 ) == 0 ) + y = -y; + } + else if ( ( *flag & 16 ) == 0 ) + y = (FT_Pos)FT_GET_SHORT(); + + x += y; + vec->x = x; + } + + /* 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; + + + if ( *flag & 4 ) + { + y = (FT_Pos)FT_GET_BYTE(); + if ( ( *flag & 32 ) == 0 ) + y = -y; + } + else if ( ( *flag & 32 ) == 0 ) + y = (FT_Pos)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; + yx = (FT_Fixed)FT_GET_SHORT() << 2; + xy = (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 */ + + /* Add two horizontal shadow points at n and n+1. */ + /* We need the left side bearing and advance width. */ + /* Add two vertical shadow points at n+2 and n+3. */ + /* We need the top side bearing and advance height. */ + + { + FT_Vector* pp1; + FT_Vector* pp2; + FT_Vector* pp3; + FT_Vector* pp4; + + + /* 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; + + /* pp3 = top side bearing */ + pp3 = pp1 + 2; + pp3->x = 0; + pp3->y = load->top_bearing + load->bbox.yMax; + + /* pp4 = pp3 - ah */ + pp4 = pp1 + 3; + pp4->x = 0; + pp4->y = pp3->y - load->vadvance; + + outline->tags[n_points ] = 0; + outline->tags[n_points + 1] = 0; + outline->tags[n_points + 2] = 0; + outline->tags[n_points + 3] = 0; + } + + /* Note that we return four more points that are not */ + /* part of the glyph outline. */ + + n_points += 4; + +#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT + + if ( ((TT_Face)load->face)->doblend ) + { + /* Deltas apply to the unscaled data. */ + FT_Vector* deltas; + FT_Memory memory = load->face->memory; + FT_StreamRec saved_stream = *(load->stream); + FT_UInt i; + + + /* TT_Vary_Get_Glyph_Deltas uses a frame, thus we have to save */ + /* (and restore) the current one */ + load->stream->cursor = 0; + load->stream->limit = 0; + + error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(load->face), + load->glyph_index, + &deltas, + n_points ); + + *(load->stream) = saved_stream; + + if ( error ) + goto Exit; + + 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 */ + + /* 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 = ((TT_Size)load->size)->metrics.x_scale; + FT_Fixed y_scale = ((TT_Size)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-4].x; + FT_Pos y = zone->org[n_points-2].y; + + + x = FT_PIX_ROUND( x ) - x; + y = FT_PIX_ROUND( y ) - y; + translate_array( n_points, zone->org, x, y ); + + org_to_cur( n_points, zone ); + + zone->cur[n_points - 3].x = FT_PIX_ROUND( zone->cur[n_points - 3].x ); + zone->cur[n_points - 1].y = FT_PIX_ROUND( zone->cur[n_points - 1].y ); + +#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 += 4; + + 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 - 4]; + load->pp2 = zone->cur[n_points - 3]; + load->pp3 = zone->cur[n_points - 2]; + load->pp4 = zone->cur[n_points - 1]; + } + +#if defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER ) || \ + defined( TT_CONFIG_OPTION_GX_VAR_SUPPORT ) + 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, + FT_UInt recurse_count ) + { + +#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 num_points, count; + FT_Fixed x_scale, y_scale; + FT_GlyphLoader gloader = loader->gloader; + FT_Bool opened_frame = 0; + +#ifdef FT_CONFIG_OPTION_INCREMENTAL + FT_StreamRec inc_stream; + FT_Data glyph_data; + FT_Bool glyph_data_loaded = 0; +#endif + +#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT + FT_Vector *deltas; +#endif + + + if ( recurse_count >= TT_MAX_COMPOSITE_RECURSE ) + { + 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; + num_points = 0; + + x_scale = 0x10000L; + y_scale = 0x10000L; + 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; + } + + /* 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 ??? */ + if ( face->root.internal->incremental_interface && + face->root.internal->incremental_interface->funcs->get_glyph_metrics ) + { + FT_Incremental_MetricsRec 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 + +#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; + } + } + +#ifdef FT_CONFIG_OPTION_INCREMENTAL + + /* Set `offset' to the start of the glyph program relative to the */ + /* start of the 'glyf' table, and `count' to the length of the */ + /* glyph program in bytes. */ + /* */ + /* 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; + count = 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 = face->glyph_locations[glyph_index]; + count = 0; + + if ( glyph_index < (FT_UInt)face->num_locations - 1 ) + count = (FT_UInt)( face->glyph_locations[glyph_index + 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; + loader->pp3.y = 0; + loader->pp4.y = loader->pp3.y-loader->vadvance; + +#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; + + + if ( (error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), + glyph_index, + &deltas, + 4 ) ) ) + 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->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); + loader->pp4.y = FT_MulFix( loader->pp4.y, y_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; + + 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; + + /***********************************************************************/ + /***********************************************************************/ + /***********************************************************************/ + + /* 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 if ( contours_count == -1 ) + { + 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; + +#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 ) ) ) + goto Exit; + + /* Note: No subglyph reallocation here, our pointers are stable. */ + 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 ) + { + /* 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, pp3, pp4; + 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; + pp3 = loader->pp3; + pp4 = loader->pp4; + + num_base_points = gloader->base.outline.n_points; + + error = load_truetype_glyph( loader, subglyph->index, + recurse_count + 1 ); + 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; + pp3 = loader->pp3; + pp4 = loader->pp4; + } + else + { + loader->pp1 = pp1; + loader->pp2 = pp2; + loader->pp3 = pp3; + loader->pp4 = pp4; + } + + 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; + + /* 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. */ + +#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED + if ( !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) && +#else + if ( ( subglyph->flags & SCALED_COMPONENT_OFFSET ) && +#endif + ( subglyph->flags & ( WE_HAVE_A_SCALE | + WE_HAVE_AN_XY_SCALE | + WE_HAVE_A_2X2 )) ) + { +#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 ) ) + { + 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_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; + + error = FT_GlyphLoader_CheckPoints( gloader, num_points + 4, 0 ); + 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 + 4 ); + pts->n_contours = gloader->base.outline.n_contours; + + /* add phantom points */ + pp1 = pts->cur + num_points; + pp1[0] = loader->pp1; + pp1[1] = loader->pp2; + pp1[2] = loader->pp3; + pp1[3] = loader->pp4; + + pts->tags[num_points ] = 0; + pts->tags[num_points + 1] = 0; + pts->tags[num_points + 2] = 0; + pts->tags[num_points + 3] = 0; + + /* if hinting, round the phantom points */ + if ( IS_HINTED( loader->load_flags ) ) + { + pp1[0].x = FT_PIX_ROUND( loader->pp1.x ); + pp1[1].x = FT_PIX_ROUND( loader->pp2.x ); + pp1[2].y = FT_PIX_ROUND( loader->pp3.y ); + pp1[3].y = FT_PIX_ROUND( loader->pp4.y ); + } + + { + FT_UInt k; + + + for ( k = 0; k < num_points; k++ ) + pts->tags[k] &= FT_CURVE_TAG_ON; + } + + cur_to_org( num_points + 4, 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]; + loader->pp3 = pp1[2]; + loader->pp4 = pp1[3]; + } + +#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ + + } + /* end of composite loading */ + } + else + { + /* invalid composite count ( negative but not -1 ) */ + error = TT_Err_Invalid_Outline; + goto Fail; + } + + /***********************************************************************/ + /***********************************************************************/ + /***********************************************************************/ + + Fail: + if ( opened_frame ) + face->forget_glyph_frame( loader ); + + Exit: + +#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 ) + { + 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 = FT_PIX_FLOOR( bbox.xMin ); + bbox.yMin = FT_PIX_FLOOR( bbox.yMin ); + bbox.xMax = FT_PIX_CEIL( bbox.xMax ); + bbox.yMax = FT_PIX_CEIL( bbox.yMax ); + } + } + 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 = FT_PIX_ROUND( glyph->metrics.horiAdvance ); + + /* 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 top bearing and advance height. */ + if ( face->vertical_info && + face->vertical.number_Of_VMetrics > 0 ) + { + advance_height = (FT_UShort)( loader->pp4.y - loader->pp3.y ); + top_bearing = (FT_Short)( loader->pp3.y - bbox.yMax ); + } + 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 */ + /* */ + /* NOTE3: This is different from what MS's rasterizer */ + /* appears to do when getting default values */ + /* for the vertical phantom points. We leave */ + /* the old code untouched, but relying on */ + /* phantom points alone might be reasonable */ + /* (i.e., removing the `if' above). */ + 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 ); + } + } + +#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; + FT_Error error = 0; + + + 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 ) + return error; + + top_bearing = (FT_Short)metrics.bearing_y; + advance_height = (FT_UShort)metrics.advance; + } + + /* GWW: Do vertical metrics get loaded incrementally too? */ + +#endif /* FT_CONFIG_OPTION_INCREMENTAL */ + + /* We must adjust the top_bearing value from the bounding box given */ + /* in the glyph header to the 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 = FT_PIX_FLOOR( left ); + top = FT_PIX_CEIL( top ); + advance = FT_PIX_ROUND( advance ); + } + + 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; + + return 0; + } + + + /*************************************************************************/ + /* */ + /* <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 ) + { + 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, + (FT_ULong)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 */ + + /* return immediately if we only want the embedded bitmaps */ + if ( load_flags & FT_LOAD_SBITS_ONLY ) + return TT_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... */ + +#ifdef FT_CONFIG_OPTION_INCREMENTAL + + /* Don't look for the glyph table if this is an incremental font. */ + if ( !face->root.internal->incremental_interface ) + +#endif + + { + 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_ZERO( &loader, 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; + + /* 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; + +#ifdef FT_CONFIG_OPTION_INCREMENTAL + + if ( face->root.internal->incremental_interface ) + loader.glyf_offset = 0; + else + +#endif + + 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, 0 ); + 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 */ + + /* 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 ( size && size->root.metrics.y_ppem < 24 ) + glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; + + Exit: + return error; + } + + +/* END */ |