1801 lines
58 KiB
C
1801 lines
58 KiB
C
/***************************************************************************/
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/* */
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/* ttgload.c */
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/* */
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/* TrueType Glyph Loader (body). */
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/* */
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/* Copyright 1996-2001, 2002, 2003 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_CALC_H
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#include FT_INTERNAL_STREAM_H
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#include FT_INTERNAL_SFNT_H
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#include FT_TRUETYPE_TAGS_H
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#include FT_OUTLINE_H
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#include "ttgload.h"
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#include "tterrors.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttgload
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/*************************************************************************/
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/* */
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/* Composite font flags. */
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/* */
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#define ARGS_ARE_WORDS 0x0001
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#define ARGS_ARE_XY_VALUES 0x0002
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#define ROUND_XY_TO_GRID 0x0004
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#define WE_HAVE_A_SCALE 0x0008
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/* reserved 0x0010 */
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#define MORE_COMPONENTS 0x0020
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#define WE_HAVE_AN_XY_SCALE 0x0040
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#define WE_HAVE_A_2X2 0x0080
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#define WE_HAVE_INSTR 0x0100
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#define USE_MY_METRICS 0x0200
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#define OVERLAP_COMPOUND 0x0400
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#define SCALED_COMPONENT_OFFSET 0x0800
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#define UNSCALED_COMPONENT_OFFSET 0x1000
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/* Maximum recursion depth we allow for composite glyphs.
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* The TrueType spec doesn't say anything about recursion,
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* so it isn't clear that recursion is allowed at all. But
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* we'll be generous.
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*/
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#define TT_MAX_COMPOSITE_RECURSE 5
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Get_Metrics */
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/* */
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/* <Description> */
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/* Returns the horizontal or vertical metrics in font units for a */
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/* given glyph. The metrics are the left side bearing (resp. top */
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/* side bearing) and advance width (resp. advance height). */
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/* */
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/* <Input> */
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/* header :: A pointer to either the horizontal or vertical metrics */
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/* structure. */
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/* */
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/* idx :: The glyph index. */
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/* */
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/* <Output> */
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/* bearing :: The bearing, either left side or top side. */
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/* */
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/* advance :: The advance width resp. advance height. */
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/* */
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/* <Note> */
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/* This function will much probably move to another component in the */
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/* near future, but I haven't decided which yet. */
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/* */
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FT_LOCAL_DEF( void )
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TT_Get_Metrics( TT_HoriHeader* header,
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FT_UInt idx,
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FT_Short* bearing,
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FT_UShort* advance )
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{
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TT_LongMetrics longs_m;
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FT_UShort k = header->number_Of_HMetrics;
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if ( k == 0 )
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{
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*bearing = *advance = 0;
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return;
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}
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if ( idx < (FT_UInt)k )
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{
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longs_m = (TT_LongMetrics )header->long_metrics + idx;
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*bearing = longs_m->bearing;
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*advance = longs_m->advance;
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}
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else
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{
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*bearing = ((TT_ShortMetrics*)header->short_metrics)[idx - k];
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*advance = ((TT_LongMetrics )header->long_metrics)[k - 1].advance;
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}
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}
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/*************************************************************************/
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/* */
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/* Returns the horizontal metrics in font units for a given glyph. If */
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/* `check' is true, take care of monospaced fonts by returning the */
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/* advance width maximum. */
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/* */
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static void
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Get_HMetrics( TT_Face face,
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FT_UInt idx,
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FT_Bool check,
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FT_Short* lsb,
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FT_UShort* aw )
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{
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TT_Get_Metrics( &face->horizontal, idx, lsb, aw );
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if ( check && face->postscript.isFixedPitch )
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*aw = face->horizontal.advance_Width_Max;
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}
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/*************************************************************************/
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/* */
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/* Returns the advance width table for a given pixel size if it is found */
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/* in the font's `hdmx' table (if any). */
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/* */
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static FT_Byte*
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Get_Advance_Widths( TT_Face face,
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FT_UShort ppem )
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{
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FT_UShort n;
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for ( n = 0; n < face->hdmx.num_records; n++ )
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if ( face->hdmx.records[n].ppem == ppem )
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return face->hdmx.records[n].widths;
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return NULL;
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}
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#define cur_to_org( n, zone ) \
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FT_MEM_COPY( (zone)->org, (zone)->cur, (n) * sizeof ( FT_Vector ) )
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#define org_to_cur( n, zone ) \
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FT_MEM_COPY( (zone)->cur, (zone)->org, (n) * sizeof ( FT_Vector ) )
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/*************************************************************************/
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/* */
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/* Translates an array of coordinates. */
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/* */
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static void
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translate_array( FT_UInt n,
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FT_Vector* coords,
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FT_Pos delta_x,
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FT_Pos delta_y )
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{
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FT_UInt k;
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if ( delta_x )
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for ( k = 0; k < n; k++ )
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coords[k].x += delta_x;
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if ( delta_y )
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for ( k = 0; k < n; k++ )
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coords[k].y += delta_y;
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}
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static void
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tt_prepare_zone( TT_GlyphZone zone,
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FT_GlyphLoad load,
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FT_UInt start_point,
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FT_UInt start_contour )
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{
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zone->n_points = (FT_UShort)( load->outline.n_points - start_point );
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zone->n_contours = (FT_Short) ( load->outline.n_contours - start_contour );
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zone->org = load->extra_points + start_point;
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zone->cur = load->outline.points + start_point;
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zone->tags = (FT_Byte*)load->outline.tags + start_point;
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zone->contours = (FT_UShort*)load->outline.contours + start_contour;
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}
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#undef IS_HINTED
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#define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 )
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/*************************************************************************/
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/* */
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/* The following functions are used by default with TrueType fonts. */
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/* However, they can be replaced by alternatives if we need to support */
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/* TrueType-compressed formats (like MicroType) in the future. */
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/* */
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/*************************************************************************/
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FT_CALLBACK_DEF( FT_Error )
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TT_Access_Glyph_Frame( TT_Loader loader,
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FT_UInt glyph_index,
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FT_ULong offset,
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FT_UInt byte_count )
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{
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FT_Error error;
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FT_Stream stream = loader->stream;
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/* for non-debug mode */
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FT_UNUSED( glyph_index );
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FT_TRACE5(( "Glyph %ld\n", glyph_index ));
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/* the following line sets the `error' variable through macros! */
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if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) )
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return error;
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return TT_Err_Ok;
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}
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FT_CALLBACK_DEF( void )
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TT_Forget_Glyph_Frame( TT_Loader loader )
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{
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FT_Stream stream = loader->stream;
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FT_FRAME_EXIT();
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}
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FT_CALLBACK_DEF( FT_Error )
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TT_Load_Glyph_Header( TT_Loader loader )
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{
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FT_Stream stream = loader->stream;
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FT_Int byte_len = loader->byte_len - 10;
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if ( byte_len < 0 )
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return TT_Err_Invalid_Outline;
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loader->n_contours = FT_GET_SHORT();
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loader->bbox.xMin = FT_GET_SHORT();
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loader->bbox.yMin = FT_GET_SHORT();
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loader->bbox.xMax = FT_GET_SHORT();
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loader->bbox.yMax = FT_GET_SHORT();
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FT_TRACE5(( " # of contours: %d\n", loader->n_contours ));
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FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin,
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loader->bbox.xMax ));
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FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin,
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loader->bbox.yMax ));
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loader->byte_len = byte_len;
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return TT_Err_Ok;
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}
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FT_CALLBACK_DEF( FT_Error )
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TT_Load_Simple_Glyph( TT_Loader load )
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{
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FT_Error error;
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FT_Stream stream = load->stream;
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FT_GlyphLoader gloader = load->gloader;
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FT_Int n_contours = load->n_contours;
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FT_Outline* outline;
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TT_Face face = (TT_Face)load->face;
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TT_GlyphSlot slot = (TT_GlyphSlot)load->glyph;
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FT_UShort n_ins;
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FT_Int n, n_points;
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FT_Int byte_len = load->byte_len;
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/* reading the contours endpoints & number of points */
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{
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short* cur = gloader->current.outline.contours;
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short* limit = cur + n_contours;
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/* check space for contours array + instructions count */
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byte_len -= 2 * ( n_contours + 1 );
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if ( byte_len < 0 )
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goto Invalid_Outline;
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for ( ; cur < limit; cur++ )
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cur[0] = FT_GET_USHORT();
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n_points = 0;
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if ( n_contours > 0 )
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n_points = cur[-1] + 1;
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error = FT_GlyphLoader_CheckPoints( gloader, n_points + 2, 0 );
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if ( error )
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goto Fail;
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/* we'd better check the contours table right now */
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outline = &gloader->current.outline;
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for ( cur = outline->contours + 1; cur < limit; cur++ )
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if ( cur[-1] >= cur[0] )
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goto Invalid_Outline;
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}
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/* reading the bytecode instructions */
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slot->control_len = 0;
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slot->control_data = 0;
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n_ins = FT_GET_USHORT();
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FT_TRACE5(( " Instructions size: %d\n", n_ins ));
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if ( n_ins > face->max_profile.maxSizeOfInstructions )
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{
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FT_TRACE0(( "TT_Load_Simple_Glyph: Too many instructions!\n" ));
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error = TT_Err_Too_Many_Hints;
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goto Fail;
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}
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byte_len -= n_ins;
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if ( byte_len < 0 )
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{
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FT_TRACE0(( "TT_Load_Simple_Glyph: Instruction count mismatch!\n" ));
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error = TT_Err_Too_Many_Hints;
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goto Fail;
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}
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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if ( ( load->load_flags &
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( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) == 0 &&
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load->instructions )
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{
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slot->control_len = n_ins;
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slot->control_data = load->instructions;
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FT_MEM_COPY( load->instructions, stream->cursor, n_ins );
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}
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#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
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stream->cursor += n_ins;
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/* reading the point tags */
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{
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FT_Byte* flag = (FT_Byte*)outline->tags;
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FT_Byte* limit = flag + n_points;
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FT_Byte c, count;
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while ( flag < limit )
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{
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if ( --byte_len < 0 )
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goto Invalid_Outline;
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*flag++ = c = FT_GET_BYTE();
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if ( c & 8 )
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{
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if ( --byte_len < 0 )
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goto Invalid_Outline;
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count = FT_GET_BYTE();
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if ( flag + count > limit )
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goto Invalid_Outline;
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for ( ; count > 0; count-- )
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*flag++ = c;
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}
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}
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/* check that there is enough room to load the coordinates */
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for ( flag = (FT_Byte*)outline->tags; flag < limit; flag++ )
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{
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if ( *flag & 2 )
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byte_len -= 1;
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else if ( ( *flag & 16 ) == 0 )
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byte_len -= 2;
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if ( *flag & 4 )
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byte_len -= 1;
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else if ( ( *flag & 32 ) == 0 )
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byte_len -= 2;
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}
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if ( byte_len < 0 )
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goto Invalid_Outline;
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}
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/* reading the X coordinates */
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{
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FT_Vector* vec = outline->points;
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FT_Vector* limit = vec + n_points;
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FT_Byte* flag = (FT_Byte*)outline->tags;
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FT_Pos x = 0;
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|
|
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for ( ; vec < limit; vec++, flag++ )
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{
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FT_Pos y = 0;
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|
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if ( *flag & 2 )
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{
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y = FT_GET_BYTE();
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if ( ( *flag & 16 ) == 0 )
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y = -y;
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}
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else if ( ( *flag & 16 ) == 0 )
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y = FT_GET_SHORT();
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x += y;
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vec->x = x;
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}
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}
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/* reading the Y coordinates */
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{
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FT_Vector* vec = gloader->current.outline.points;
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FT_Vector* limit = vec + n_points;
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FT_Byte* flag = (FT_Byte*)outline->tags;
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FT_Pos x = 0;
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|
|
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for ( ; vec < limit; vec++, flag++ )
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{
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FT_Pos y = 0;
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|
|
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if ( *flag & 4 )
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{
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y = FT_GET_BYTE();
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if ( ( *flag & 32 ) == 0 )
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y = -y;
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}
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else if ( ( *flag & 32 ) == 0 )
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y = FT_GET_SHORT();
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|
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x += y;
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vec->y = x;
|
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}
|
|
}
|
|
|
|
/* clear the touch tags */
|
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for ( n = 0; n < n_points; n++ )
|
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outline->tags[n] &= FT_CURVE_TAG_ON;
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|
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outline->n_points = (FT_UShort)n_points;
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outline->n_contours = (FT_Short) n_contours;
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|
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load->byte_len = byte_len;
|
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|
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Fail:
|
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return error;
|
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|
|
Invalid_Outline:
|
|
error = TT_Err_Invalid_Outline;
|
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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 */
|
|
|
|
/* 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,
|
|
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
|
|
struct FT_StreamRec_ inc_stream;
|
|
FT_Data glyph_data;
|
|
FT_Bool glyph_data_loaded = 0;
|
|
#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 = loader->size->metrics.x_scale;
|
|
y_scale = loader->size->metrics.y_scale;
|
|
}
|
|
|
|
/* get horizontal metrics */
|
|
{
|
|
FT_Short left_bearing = 0;
|
|
FT_UShort advance_width = 0;
|
|
|
|
Get_HMetrics( face, glyph_index,
|
|
(FT_Bool)!( loader->load_flags &
|
|
FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
|
|
&left_bearing,
|
|
&advance_width );
|
|
|
|
#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;
|
|
}
|
|
|
|
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
|
|
|
|
loader->left_bearing = left_bearing;
|
|
loader->advance = advance_width;
|
|
|
|
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 = 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;
|
|
|
|
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
|
|
loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
|
|
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
|
|
if ( loader->exec )
|
|
loader->exec->glyphSize = 0;
|
|
|
|
#endif
|
|
|
|
error = TT_Err_Ok;
|
|
goto Exit;
|
|
}
|
|
|
|
loader->byte_len = (FT_Int)count;
|
|
|
|
offset = loader->glyf_offset + offset;
|
|
|
|
/* access glyph frame */
|
|
error = face->access_glyph_frame( loader, glyph_index, offset, count );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
opened_frame = 1;
|
|
|
|
/* read first glyph header */
|
|
error = face->read_glyph_header( loader );
|
|
if ( error )
|
|
goto Fail;
|
|
|
|
contours_count = loader->n_contours;
|
|
|
|
count -= 10;
|
|
|
|
loader->pp1.x = loader->bbox.xMin - loader->left_bearing;
|
|
loader->pp1.y = 0;
|
|
loader->pp2.x = loader->pp1.x + loader->advance;
|
|
loader->pp2.y = 0;
|
|
|
|
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
|
|
{
|
|
loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
|
|
loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
|
|
}
|
|
|
|
/***********************************************************************/
|
|
/***********************************************************************/
|
|
/***********************************************************************/
|
|
|
|
/* if it is a simple glyph, load it */
|
|
|
|
if ( contours_count >= 0 )
|
|
{
|
|
/* check that we can add the contours to the glyph */
|
|
error = FT_GlyphLoader_CheckPoints( gloader, 0, contours_count );
|
|
if ( error )
|
|
goto Fail;
|
|
|
|
error = face->read_simple_glyph( loader );
|
|
if ( error )
|
|
goto Fail;
|
|
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
|
|
{
|
|
TT_Size size = (TT_Size)loader->size;
|
|
|
|
|
|
error = TT_Process_Simple_Glyph( loader,
|
|
(FT_Bool)( size && size->debug ) );
|
|
}
|
|
|
|
#else
|
|
|
|
error = TT_Process_Simple_Glyph( loader, 0 );
|
|
|
|
#endif
|
|
|
|
if ( error )
|
|
goto Fail;
|
|
|
|
FT_GlyphLoader_Add( gloader );
|
|
|
|
/* Note: We could have put the simple loader source there */
|
|
/* but the code is fat enough already :-) */
|
|
}
|
|
|
|
/***********************************************************************/
|
|
/***********************************************************************/
|
|
/***********************************************************************/
|
|
|
|
/* otherwise, load a composite! */
|
|
else 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;
|
|
|
|
/* 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;
|
|
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,
|
|
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;
|
|
}
|
|
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;
|
|
|
|
/* 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. */
|
|
/* */
|
|
int mac_xscale = FT_SqrtFixed(
|
|
FT_MulFix( subglyph->transform.xx,
|
|
subglyph->transform.xx ) +
|
|
FT_MulFix( subglyph->transform.xy,
|
|
subglyph->transform.xy) );
|
|
int 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 = ( x + 32 ) & -64;
|
|
y = ( y + 32 ) & -64;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( x || y )
|
|
{
|
|
translate_array( num_new_points,
|
|
gloader->base.outline.points + num_base_points,
|
|
x, y );
|
|
|
|
translate_array( num_new_points,
|
|
gloader->base.extra_points + num_base_points,
|
|
x, y );
|
|
}
|
|
}
|
|
|
|
/*******************************************************************/
|
|
/*******************************************************************/
|
|
/*******************************************************************/
|
|
|
|
/* we have finished loading all sub-glyphs; now, look for */
|
|
/* instructions for this composite! */
|
|
|
|
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
|
|
|
|
if ( num_subglyphs > 0 &&
|
|
loader->exec &&
|
|
ins_pos > 0 &&
|
|
subglyph->flags & WE_HAVE_INSTR )
|
|
{
|
|
FT_UShort n_ins;
|
|
TT_ExecContext exec = loader->exec;
|
|
TT_GlyphZone pts;
|
|
FT_Vector* pp1;
|
|
|
|
|
|
/* read size of instructions */
|
|
if ( FT_STREAM_SEEK( ins_pos ) ||
|
|
FT_READ_USHORT( n_ins ) )
|
|
goto Fail;
|
|
FT_TRACE5(( " Instructions size = %d\n", n_ins ));
|
|
|
|
/* in some fonts? */
|
|
if ( n_ins == 0xFFFFU )
|
|
n_ins = 0;
|
|
|
|
/* check it */
|
|
if ( n_ins > face->max_profile.maxSizeOfInstructions )
|
|
{
|
|
FT_TRACE0(( "Too many instructions (%d) in composite glyph %ld\n",
|
|
n_ins, subglyph->index ));
|
|
error = TT_Err_Too_Many_Hints;
|
|
goto Fail;
|
|
}
|
|
|
|
/* read the instructions */
|
|
if ( FT_STREAM_READ( exec->glyphIns, n_ins ) )
|
|
goto Fail;
|
|
|
|
glyph->control_data = exec->glyphIns;
|
|
glyph->control_len = n_ins;
|
|
|
|
error = TT_Set_CodeRange( exec,
|
|
tt_coderange_glyph,
|
|
exec->glyphIns,
|
|
n_ins );
|
|
if ( error )
|
|
goto Fail;
|
|
|
|
/* prepare the execution context */
|
|
tt_prepare_zone( &exec->pts, &gloader->base,
|
|
start_point, start_contour );
|
|
pts = &exec->pts;
|
|
|
|
pts->n_points = (short)(num_points + 2);
|
|
pts->n_contours = gloader->base.outline.n_contours;
|
|
|
|
/* add phantom points */
|
|
pp1 = pts->cur + num_points;
|
|
pp1[0] = loader->pp1;
|
|
pp1[1] = loader->pp2;
|
|
|
|
pts->tags[num_points ] = 0;
|
|
pts->tags[num_points + 1] = 0;
|
|
|
|
/* if hinting, round the phantom points */
|
|
if ( IS_HINTED( loader->load_flags ) )
|
|
{
|
|
pp1[0].x = ( ( loader->pp1.x + 32 ) & -64 );
|
|
pp1[1].x = ( ( loader->pp2.x + 32 ) & -64 );
|
|
}
|
|
|
|
{
|
|
FT_UInt k;
|
|
|
|
|
|
for ( k = 0; k < num_points; k++ )
|
|
pts->tags[k] &= FT_CURVE_TAG_ON;
|
|
}
|
|
|
|
cur_to_org( num_points + 2, pts );
|
|
|
|
/* now consider hinting */
|
|
if ( IS_HINTED( loader->load_flags ) && n_ins > 0 )
|
|
{
|
|
exec->is_composite = TRUE;
|
|
exec->pedantic_hinting =
|
|
(FT_Bool)( loader->load_flags & FT_LOAD_PEDANTIC );
|
|
error = TT_Run_Context( exec, ((TT_Size)loader->size)->debug );
|
|
if ( error && exec->pedantic_hinting )
|
|
goto Fail;
|
|
}
|
|
|
|
/* save glyph origin and advance points */
|
|
loader->pp1 = pp1[0];
|
|
loader->pp2 = pp1[1];
|
|
}
|
|
|
|
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
|
|
|
|
}
|
|
/* end of composite loading */
|
|
}
|
|
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 &= -64;
|
|
bbox.yMin &= -64;
|
|
bbox.xMax = ( bbox.xMax + 63 ) & -64;
|
|
bbox.yMax = ( bbox.yMax + 63 ) & -64;
|
|
}
|
|
}
|
|
else
|
|
bbox = loader->bbox;
|
|
|
|
/* get the device-independent horizontal advance. It is scaled later */
|
|
/* by the base layer. */
|
|
{
|
|
FT_Pos advance = loader->linear;
|
|
|
|
|
|
/* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */
|
|
/* correctly support DynaLab fonts, which have an incorrect */
|
|
/* `advance_Width_Max' field! It is used, to my knowledge, */
|
|
/* exclusively in the X-TrueType font server. */
|
|
/* */
|
|
if ( face->postscript.isFixedPitch &&
|
|
( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
|
|
advance = face->horizontal.advance_Width_Max;
|
|
|
|
/* we need to return the advance in font units in linearHoriAdvance, */
|
|
/* it will be scaled later by the base layer. */
|
|
glyph->linearHoriAdvance = advance;
|
|
}
|
|
|
|
glyph->metrics.horiBearingX = bbox.xMin;
|
|
glyph->metrics.horiBearingY = bbox.yMax;
|
|
glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
|
|
|
|
/* don't forget to hint the advance when we need to */
|
|
if ( IS_HINTED( loader->load_flags ) )
|
|
glyph->metrics.horiAdvance = ( glyph->metrics.horiAdvance + 32 ) & -64;
|
|
|
|
/* Now take care of vertical metrics. In the case where there is */
|
|
/* no vertical information within the font (relatively common), make */
|
|
/* up some metrics by `hand'... */
|
|
|
|
{
|
|
FT_Short top_bearing; /* vertical top side bearing (EM units) */
|
|
FT_UShort advance_height; /* vertical advance height (EM units) */
|
|
|
|
FT_Pos left; /* scaled vertical left side bearing */
|
|
FT_Pos top; /* scaled vertical top side bearing */
|
|
FT_Pos advance; /* scaled vertical advance height */
|
|
|
|
/* Get the unscaled top bearing and advance height. */
|
|
if ( face->vertical_info &&
|
|
face->vertical.number_Of_VMetrics > 0 )
|
|
{
|
|
/* Don't assume that both the vertical header and vertical */
|
|
/* metrics are present in the same font :-) */
|
|
|
|
TT_Get_Metrics( (TT_HoriHeader*)&face->vertical,
|
|
glyph_index,
|
|
&top_bearing,
|
|
&advance_height );
|
|
}
|
|
else
|
|
{
|
|
/* Make up the distances from the horizontal header. */
|
|
|
|
/* NOTE: The OS/2 values are the only `portable' ones, */
|
|
/* which is why we use them, if there is an OS/2 */
|
|
/* table in the font. Otherwise, we use the */
|
|
/* values defined in the horizontal header. */
|
|
/* */
|
|
/* NOTE2: The sTypoDescender is negative, which is why */
|
|
/* we compute the baseline-to-baseline distance */
|
|
/* here with: */
|
|
/* ascender - descender + linegap */
|
|
/* */
|
|
if ( face->os2.version != 0xFFFFU )
|
|
{
|
|
top_bearing = (FT_Short)( face->os2.sTypoLineGap / 2 );
|
|
advance_height = (FT_UShort)( face->os2.sTypoAscender -
|
|
face->os2.sTypoDescender +
|
|
face->os2.sTypoLineGap );
|
|
}
|
|
else
|
|
{
|
|
top_bearing = (FT_Short)( face->horizontal.Line_Gap / 2 );
|
|
advance_height = (FT_UShort)( face->horizontal.Ascender +
|
|
face->horizontal.Descender +
|
|
face->horizontal.Line_Gap );
|
|
}
|
|
}
|
|
|
|
#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;
|
|
}
|
|
|
|
#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 &= -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;
|
|
|
|
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_UShort 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,
|
|
size->strike_index,
|
|
glyph_index,
|
|
load_flags,
|
|
stream,
|
|
&glyph->bitmap,
|
|
&metrics );
|
|
if ( !error )
|
|
{
|
|
glyph->outline.n_points = 0;
|
|
glyph->outline.n_contours = 0;
|
|
|
|
glyph->metrics.width = (FT_Pos)metrics.width << 6;
|
|
glyph->metrics.height = (FT_Pos)metrics.height << 6;
|
|
|
|
glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6;
|
|
glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6;
|
|
glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6;
|
|
|
|
glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6;
|
|
glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6;
|
|
glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6;
|
|
|
|
glyph->format = FT_GLYPH_FORMAT_BITMAP;
|
|
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
|
|
{
|
|
glyph->bitmap_left = metrics.vertBearingX;
|
|
glyph->bitmap_top = metrics.vertBearingY;
|
|
}
|
|
else
|
|
{
|
|
glyph->bitmap_left = metrics.horiBearingX;
|
|
glyph->bitmap_top = metrics.horiBearingY;
|
|
}
|
|
return error;
|
|
}
|
|
}
|
|
|
|
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
|
|
|
|
/* return immediately if we only want the embedded bitmaps */
|
|
if ( load_flags & FT_LOAD_SBITS_ONLY )
|
|
return FT_Err_Invalid_Argument;
|
|
|
|
/* seek to the beginning of the glyph table. For Type 42 fonts */
|
|
/* the table might be accessed from a Postscript stream or something */
|
|
/* else... */
|
|
|
|
#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 */
|