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, 0 insertions, 2039 deletions
diff --git a/nx-X11/extras/freetype2/src/truetype/ttgload.c b/nx-X11/extras/freetype2/src/truetype/ttgload.c deleted file mode 100644 index 9fc2d0380..000000000 --- a/nx-X11/extras/freetype2/src/truetype/ttgload.c +++ /dev/null @@ -1,2039 +0,0 @@ -/***************************************************************************/ -/* */ -/* 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 */ |