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