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-rw-r--r--src/truetype/ttgload.c1976
1 files changed, 1976 insertions, 0 deletions
diff --git a/src/truetype/ttgload.c b/src/truetype/ttgload.c
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+++ b/src/truetype/ttgload.c
@@ -0,0 +1,1976 @@
+/***************************************************************************/
+/* */
+/* ttgload.c */
+/* */
+/* TrueType Glyph Loader (body). */
+/* */
+/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_CALC_H
+#include FT_INTERNAL_STREAM_H
+#include FT_INTERNAL_SFNT_H
+#include FT_TRUETYPE_TAGS_H
+#include FT_OUTLINE_H
+
+#include "ttgload.h"
+#include "ttpload.h"
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+#include "ttgxvar.h"
+#endif
+
+#include "tterrors.h"
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_ttgload
+
+
+ /*************************************************************************/
+ /* */
+ /* Composite font flags. */
+ /* */
+#define ARGS_ARE_WORDS 0x0001
+#define ARGS_ARE_XY_VALUES 0x0002
+#define ROUND_XY_TO_GRID 0x0004
+#define WE_HAVE_A_SCALE 0x0008
+/* reserved 0x0010 */
+#define MORE_COMPONENTS 0x0020
+#define WE_HAVE_AN_XY_SCALE 0x0040
+#define WE_HAVE_A_2X2 0x0080
+#define WE_HAVE_INSTR 0x0100
+#define USE_MY_METRICS 0x0200
+#define OVERLAP_COMPOUND 0x0400
+#define SCALED_COMPONENT_OFFSET 0x0800
+#define UNSCALED_COMPONENT_OFFSET 0x1000
+
+
+ /*************************************************************************/
+ /* */
+ /* Returns the horizontal metrics in font units for a given glyph. If */
+ /* `check' is true, take care of monospaced fonts by returning the */
+ /* advance width maximum. */
+ /* */
+ FT_LOCAL_DEF(void)
+ TT_Get_HMetrics( TT_Face face,
+ FT_UInt idx,
+ FT_Bool check,
+ FT_Short* lsb,
+ FT_UShort* aw )
+ {
+ ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );
+
+ if ( check && face->postscript.isFixedPitch )
+ *aw = face->horizontal.advance_Width_Max;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Returns the vertical metrics in font units for a given glyph. */
+ /* Greg Hitchcock from Microsoft told us that if there were no `vmtx' */
+ /* table, typoAscender/Descender from the `OS/2' table would be used */
+ /* instead, and if there were no `OS/2' table, use ascender/descender */
+ /* from the `hhea' table. But that is not what Microsoft's rasterizer */
+ /* apparently does: It uses the ppem value as the advance height, and */
+ /* sets the top side bearing to be zero. */
+ /* */
+ /* The monospace `check' is probably not meaningful here, but we leave */
+ /* it in for a consistent interface. */
+ /* */
+ FT_LOCAL_DEF(void)
+ TT_Get_VMetrics( TT_Face face,
+ FT_UInt idx,
+ FT_Bool check,
+ FT_Short* tsb,
+ FT_UShort* ah )
+ {
+ FT_UNUSED( check );
+
+ if ( face->vertical_info )
+ ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );
+
+#if 1 /* Empirically determined, at variance with what MS said */
+
+ else
+ {
+ *tsb = 0;
+ *ah = face->root.units_per_EM;
+ }
+
+#else /* This is what MS said to do. It isn't what they do, however. */
+
+ else if ( face->os2.version != 0xFFFFU )
+ {
+ *tsb = face->os2.sTypoAscender;
+ *ah = face->os2.sTypoAscender - face->os2.sTypoDescender;
+ }
+ else
+ {
+ *tsb = face->horizontal.Ascender;
+ *ah = face->horizontal.Ascender - face->horizontal.Descender;
+ }
+
+#endif
+
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Translates an array of coordinates. */
+ /* */
+ static void
+ translate_array( FT_UInt n,
+ FT_Vector* coords,
+ FT_Pos delta_x,
+ FT_Pos delta_y )
+ {
+ FT_UInt k;
+
+
+ if ( delta_x )
+ for ( k = 0; k < n; k++ )
+ coords[k].x += delta_x;
+
+ if ( delta_y )
+ for ( k = 0; k < n; k++ )
+ coords[k].y += delta_y;
+ }
+
+
+#undef IS_HINTED
+#define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 )
+
+
+ /*************************************************************************/
+ /* */
+ /* The following functions are used by default with TrueType fonts. */
+ /* However, they can be replaced by alternatives if we need to support */
+ /* TrueType-compressed formats (like MicroType) in the future. */
+ /* */
+ /*************************************************************************/
+
+ FT_CALLBACK_DEF( FT_Error )
+ TT_Access_Glyph_Frame( TT_Loader loader,
+ FT_UInt glyph_index,
+ FT_ULong offset,
+ FT_UInt byte_count )
+ {
+ FT_Error error;
+ FT_Stream stream = loader->stream;
+
+ /* for non-debug mode */
+ FT_UNUSED( glyph_index );
+
+
+ FT_TRACE5(( "Glyph %ld\n", glyph_index ));
+
+ /* the following line sets the `error' variable through macros! */
+ if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) )
+ return error;
+
+ loader->cursor = stream->cursor;
+ loader->limit = stream->limit;
+
+ return TT_Err_Ok;
+ }
+
+
+ FT_CALLBACK_DEF( void )
+ TT_Forget_Glyph_Frame( TT_Loader loader )
+ {
+ FT_Stream stream = loader->stream;
+
+
+ FT_FRAME_EXIT();
+ }
+
+
+ FT_CALLBACK_DEF( FT_Error )
+ TT_Load_Glyph_Header( TT_Loader loader )
+ {
+ FT_Byte* p = loader->cursor;
+ FT_Byte* limit = loader->limit;
+
+
+ if ( p + 10 > limit )
+ return TT_Err_Invalid_Outline;
+
+ loader->n_contours = FT_NEXT_SHORT( p );
+
+ loader->bbox.xMin = FT_NEXT_SHORT( p );
+ loader->bbox.yMin = FT_NEXT_SHORT( p );
+ loader->bbox.xMax = FT_NEXT_SHORT( p );
+ loader->bbox.yMax = FT_NEXT_SHORT( p );
+
+ FT_TRACE5(( " # of contours: %d\n", loader->n_contours ));
+ FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin,
+ loader->bbox.xMax ));
+ FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin,
+ loader->bbox.yMax ));
+ loader->cursor = p;
+
+ return TT_Err_Ok;
+ }
+
+
+ FT_CALLBACK_DEF( FT_Error )
+ TT_Load_Simple_Glyph( TT_Loader load )
+ {
+ FT_Error error;
+ FT_Byte* p = load->cursor;
+ FT_Byte* limit = load->limit;
+ FT_GlyphLoader gloader = load->gloader;
+ FT_Int n_contours = load->n_contours;
+ FT_Outline* outline;
+ TT_Face face = (TT_Face)load->face;
+ FT_UShort n_ins;
+ FT_Int n_points;
+
+ FT_Byte *flag, *flag_limit;
+ FT_Byte c, count;
+ FT_Vector *vec, *vec_limit;
+ FT_Pos x;
+ FT_Short *cont, *cont_limit, prev_cont;
+ FT_Int xy_size = 0;
+
+
+ /* check that we can add the contours to the glyph */
+ error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours );
+ if ( error )
+ goto Fail;
+
+ /* reading the contours' endpoints & number of points */
+ cont = gloader->current.outline.contours;
+ cont_limit = cont + n_contours;
+
+ /* check space for contours array + instructions count */
+ if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit )
+ goto Invalid_Outline;
+
+ prev_cont = FT_NEXT_USHORT( p );
+
+ if ( n_contours > 0 )
+ cont[0] = prev_cont;
+
+ for ( cont++; cont < cont_limit; cont++ )
+ {
+ cont[0] = FT_NEXT_USHORT( p );
+ if ( cont[0] <= prev_cont )
+ {
+ /* unordered contours: this is invalid */
+ error = FT_Err_Invalid_Table;
+ goto Fail;
+ }
+ prev_cont = cont[0];
+ }
+
+ n_points = 0;
+ if ( n_contours > 0 )
+ {
+ n_points = cont[-1] + 1;
+ if ( n_points < 0 )
+ goto Invalid_Outline;
+ }
+
+ /* note that we will add four phantom points later */
+ error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 );
+ if ( error )
+ goto Fail;
+
+ /* we'd better check the contours table right now */
+ outline = &gloader->current.outline;
+
+ for ( cont = outline->contours + 1; cont < cont_limit; cont++ )
+ if ( cont[-1] >= cont[0] )
+ goto Invalid_Outline;
+
+ /* reading the bytecode instructions */
+ load->glyph->control_len = 0;
+ load->glyph->control_data = 0;
+
+ if ( p + 2 > limit )
+ goto Invalid_Outline;
+
+ n_ins = FT_NEXT_USHORT( p );
+
+ FT_TRACE5(( " Instructions size: %u\n", n_ins ));
+
+ if ( n_ins > face->max_profile.maxSizeOfInstructions )
+ {
+ FT_TRACE0(( "TT_Load_Simple_Glyph: Too many instructions (%d)\n",
+ n_ins ));
+ error = TT_Err_Too_Many_Hints;
+ goto Fail;
+ }
+
+ if ( ( limit - p ) < n_ins )
+ {
+ FT_TRACE0(( "TT_Load_Simple_Glyph: Instruction count mismatch!\n" ));
+ error = TT_Err_Too_Many_Hints;
+ goto Fail;
+ }
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+ if ( IS_HINTED( load->load_flags ) )
+ {
+ load->glyph->control_len = n_ins;
+ load->glyph->control_data = load->exec->glyphIns;
+
+ FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );
+ }
+
+#endif /* TT_USE_BYTECODE_INTERPRETER */
+
+ p += n_ins;
+
+ /* reading the point tags */
+ flag = (FT_Byte*)outline->tags;
+ flag_limit = flag + n_points;
+
+ FT_ASSERT( flag != NULL );
+
+ while ( flag < flag_limit )
+ {
+ if ( p + 1 > limit )
+ goto Invalid_Outline;
+
+ *flag++ = c = FT_NEXT_BYTE( p );
+ if ( c & 8 )
+ {
+ if ( p + 1 > limit )
+ goto Invalid_Outline;
+
+ count = FT_NEXT_BYTE( p );
+ if ( flag + (FT_Int)count > flag_limit )
+ goto Invalid_Outline;
+
+ for ( ; count > 0; count-- )
+ *flag++ = c;
+ }
+ }
+
+ /* reading the X coordinates */
+
+ vec = outline->points;
+ vec_limit = vec + n_points;
+ flag = (FT_Byte*)outline->tags;
+ x = 0;
+
+ if ( p + xy_size > limit )
+ goto Invalid_Outline;
+
+ for ( ; vec < vec_limit; vec++, flag++ )
+ {
+ FT_Pos y = 0;
+ FT_Byte f = *flag;
+
+
+ if ( f & 2 )
+ {
+ if ( p + 1 > limit )
+ goto Invalid_Outline;
+
+ y = (FT_Pos)FT_NEXT_BYTE( p );
+ if ( ( f & 16 ) == 0 )
+ y = -y;
+ }
+ else if ( ( f & 16 ) == 0 )
+ {
+ if ( p + 2 > limit )
+ goto Invalid_Outline;
+
+ y = (FT_Pos)FT_NEXT_SHORT( p );
+ }
+
+ x += y;
+ vec->x = x;
+ *flag = f & ~( 2 | 16 );
+ }
+
+ /* reading the Y coordinates */
+
+ vec = gloader->current.outline.points;
+ vec_limit = vec + n_points;
+ flag = (FT_Byte*)outline->tags;
+ x = 0;
+
+ for ( ; vec < vec_limit; vec++, flag++ )
+ {
+ FT_Pos y = 0;
+ FT_Byte f = *flag;
+
+
+ if ( f & 4 )
+ {
+ if ( p + 1 > limit )
+ goto Invalid_Outline;
+
+ y = (FT_Pos)FT_NEXT_BYTE( p );
+ if ( ( f & 32 ) == 0 )
+ y = -y;
+ }
+ else if ( ( f & 32 ) == 0 )
+ {
+ if ( p + 2 > limit )
+ goto Invalid_Outline;
+
+ y = (FT_Pos)FT_NEXT_SHORT( p );
+ }
+
+ x += y;
+ vec->y = x;
+ *flag = f & FT_CURVE_TAG_ON;
+ }
+
+ outline->n_points = (FT_UShort)n_points;
+ outline->n_contours = (FT_Short) n_contours;
+
+ load->cursor = p;
+
+ Fail:
+ return error;
+
+ Invalid_Outline:
+ error = TT_Err_Invalid_Outline;
+ goto Fail;
+ }
+
+
+ FT_CALLBACK_DEF( FT_Error )
+ TT_Load_Composite_Glyph( TT_Loader loader )
+ {
+ FT_Error error;
+ FT_Byte* p = loader->cursor;
+ FT_Byte* limit = loader->limit;
+ FT_GlyphLoader gloader = loader->gloader;
+ FT_SubGlyph subglyph;
+ FT_UInt num_subglyphs;
+
+
+ num_subglyphs = 0;
+
+ do
+ {
+ FT_Fixed xx, xy, yy, yx;
+ FT_UInt count;
+
+
+ /* check that we can load a new subglyph */
+ error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 );
+ if ( error )
+ goto Fail;
+
+ /* check space */
+ if ( p + 4 > limit )
+ goto Invalid_Composite;
+
+ subglyph = gloader->current.subglyphs + num_subglyphs;
+
+ subglyph->arg1 = subglyph->arg2 = 0;
+
+ subglyph->flags = FT_NEXT_USHORT( p );
+ subglyph->index = FT_NEXT_USHORT( p );
+
+ /* check space */
+ count = 2;
+ if ( subglyph->flags & ARGS_ARE_WORDS )
+ count += 2;
+ if ( subglyph->flags & WE_HAVE_A_SCALE )
+ count += 2;
+ else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
+ count += 4;
+ else if ( subglyph->flags & WE_HAVE_A_2X2 )
+ count += 8;
+
+ if ( p + count > limit )
+ goto Invalid_Composite;
+
+ /* read arguments */
+ if ( subglyph->flags & ARGS_ARE_WORDS )
+ {
+ subglyph->arg1 = FT_NEXT_SHORT( p );
+ subglyph->arg2 = FT_NEXT_SHORT( p );
+ }
+ else
+ {
+ subglyph->arg1 = FT_NEXT_CHAR( p );
+ subglyph->arg2 = FT_NEXT_CHAR( p );
+ }
+
+ /* read transform */
+ xx = yy = 0x10000L;
+ xy = yx = 0;
+
+ if ( subglyph->flags & WE_HAVE_A_SCALE )
+ {
+ xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+ yy = xx;
+ }
+ else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
+ {
+ xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+ yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+ }
+ else if ( subglyph->flags & WE_HAVE_A_2X2 )
+ {
+ xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+ yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+ xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+ yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+ }
+
+ subglyph->transform.xx = xx;
+ subglyph->transform.xy = xy;
+ subglyph->transform.yx = yx;
+ subglyph->transform.yy = yy;
+
+ num_subglyphs++;
+
+ } while ( subglyph->flags & MORE_COMPONENTS );
+
+ gloader->current.num_subglyphs = num_subglyphs;
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+ {
+ FT_Stream stream = loader->stream;
+
+
+ /* we must undo the FT_FRAME_ENTER in order to point to the */
+ /* composite instructions, if we find some. */
+ /* we will process them later... */
+ /* */
+ loader->ins_pos = (FT_ULong)( FT_STREAM_POS() +
+ p - limit );
+ }
+
+#endif
+
+ loader->cursor = p;
+
+ Fail:
+ return error;
+
+ Invalid_Composite:
+ error = TT_Err_Invalid_Composite;
+ goto Fail;
+ }
+
+
+ FT_LOCAL_DEF( void )
+ TT_Init_Glyph_Loading( TT_Face face )
+ {
+ face->access_glyph_frame = TT_Access_Glyph_Frame;
+ face->read_glyph_header = TT_Load_Glyph_Header;
+ face->read_simple_glyph = TT_Load_Simple_Glyph;
+ face->read_composite_glyph = TT_Load_Composite_Glyph;
+ face->forget_glyph_frame = TT_Forget_Glyph_Frame;
+ }
+
+
+ static void
+ tt_prepare_zone( TT_GlyphZone zone,
+ FT_GlyphLoad load,
+ FT_UInt start_point,
+ FT_UInt start_contour )
+ {
+ zone->n_points = (FT_UShort)( load->outline.n_points - start_point );
+ zone->n_contours = (FT_Short) ( load->outline.n_contours -
+ start_contour );
+ zone->org = load->extra_points + start_point;
+ zone->cur = load->outline.points + start_point;
+ zone->orus = load->extra_points2 + start_point;
+ zone->tags = (FT_Byte*)load->outline.tags + start_point;
+ zone->contours = (FT_UShort*)load->outline.contours + start_contour;
+ zone->first_point = (FT_UShort)start_point;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Hint_Glyph */
+ /* */
+ /* <Description> */
+ /* Hint the glyph using the zone prepared by the caller. Note that */
+ /* the zone is supposed to include four phantom points. */
+ /* */
+ static FT_Error
+ TT_Hint_Glyph( TT_Loader loader,
+ FT_Bool is_composite )
+ {
+ TT_GlyphZone zone = &loader->zone;
+ FT_Pos origin;
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+ FT_UInt n_ins;
+#else
+ FT_UNUSED( is_composite );
+#endif
+
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+ n_ins = loader->glyph->control_len;
+#endif
+
+ origin = zone->cur[zone->n_points - 4].x;
+ origin = FT_PIX_ROUND( origin ) - origin;
+ if ( origin )
+ translate_array( zone->n_points, zone->cur, origin, 0 );
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+ /* save original point position in org */
+ if ( n_ins > 0 )
+ FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points );
+ /* Reset graphics state. */
+ loader->exec->GS = ((TT_Size)loader->size)->GS;
+
+ /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */
+ /* completely refer to the (already) hinted subglyphs. */
+ if ( is_composite )
+ {
+ loader->exec->metrics.x_scale = 1 << 16;
+ loader->exec->metrics.y_scale = 1 << 16;
+
+ FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points );
+ }
+ else
+ {
+ loader->exec->metrics.x_scale =
+ ((TT_Size)loader->size)->metrics.x_scale;
+ loader->exec->metrics.y_scale =
+ ((TT_Size)loader->size)->metrics.y_scale;
+ }
+#endif
+
+ /* round pp2 and pp4 */
+ zone->cur[zone->n_points - 3].x =
+ FT_PIX_ROUND( zone->cur[zone->n_points - 3].x );
+ zone->cur[zone->n_points - 1].y =
+ FT_PIX_ROUND( zone->cur[zone->n_points - 1].y );
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+ if ( n_ins > 0 )
+ {
+ FT_Bool debug;
+ FT_Error error;
+
+
+ error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph,
+ loader->exec->glyphIns, n_ins );
+ if ( error )
+ return error;
+
+ loader->exec->is_composite = is_composite;
+ loader->exec->pts = *zone;
+
+ debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) &&
+ ((TT_Size)loader->size)->debug );
+
+ error = TT_Run_Context( loader->exec, debug );
+ if ( error && loader->exec->pedantic_hinting )
+ return error;
+ }
+
+#endif
+
+ /* save glyph phantom points */
+ if ( !loader->preserve_pps )
+ {
+ loader->pp1 = zone->cur[zone->n_points - 4];
+ loader->pp2 = zone->cur[zone->n_points - 3];
+ loader->pp3 = zone->cur[zone->n_points - 2];
+ loader->pp4 = zone->cur[zone->n_points - 1];
+ }
+
+ return TT_Err_Ok;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Process_Simple_Glyph */
+ /* */
+ /* <Description> */
+ /* Once a simple glyph has been loaded, it needs to be processed. */
+ /* Usually, this means scaling and hinting through bytecode */
+ /* interpretation. */
+ /* */
+ static FT_Error
+ TT_Process_Simple_Glyph( TT_Loader loader )
+ {
+ FT_GlyphLoader gloader = loader->gloader;
+ FT_Error error = TT_Err_Ok;
+ FT_Outline* outline;
+ FT_Int n_points;
+
+
+ outline = &gloader->current.outline;
+ n_points = outline->n_points;
+
+ /* set phantom points */
+
+ outline->points[n_points ] = loader->pp1;
+ outline->points[n_points + 1] = loader->pp2;
+ outline->points[n_points + 2] = loader->pp3;
+ outline->points[n_points + 3] = loader->pp4;
+
+ outline->tags[n_points ] = 0;
+ outline->tags[n_points + 1] = 0;
+ outline->tags[n_points + 2] = 0;
+ outline->tags[n_points + 3] = 0;
+
+ n_points += 4;
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+
+ if ( ((TT_Face)loader->face)->doblend )
+ {
+ /* Deltas apply to the unscaled data. */
+ FT_Vector* deltas;
+ FT_Memory memory = loader->face->memory;
+ FT_Int i;
+
+
+ error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
+ loader->glyph_index,
+ &deltas,
+ n_points );
+ if ( error )
+ return error;
+
+ for ( i = 0; i < n_points; ++i )
+ {
+ outline->points[i].x += deltas[i].x;
+ outline->points[i].y += deltas[i].y;
+ }
+
+ FT_FREE( deltas );
+ }
+
+#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
+
+ if ( IS_HINTED( loader->load_flags ) )
+ {
+ tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 );
+
+ FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur,
+ loader->zone.n_points + 4 );
+ }
+
+ /* scale the glyph */
+ if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+ {
+ FT_Vector* vec = outline->points;
+ FT_Vector* limit = outline->points + n_points;
+ FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
+ FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
+
+
+ for ( ; vec < limit; vec++ )
+ {
+ vec->x = FT_MulFix( vec->x, x_scale );
+ vec->y = FT_MulFix( vec->y, y_scale );
+ }
+
+ loader->pp1 = outline->points[n_points - 4];
+ loader->pp2 = outline->points[n_points - 3];
+ loader->pp3 = outline->points[n_points - 2];
+ loader->pp4 = outline->points[n_points - 1];
+ }
+
+ if ( IS_HINTED( loader->load_flags ) )
+ {
+ loader->zone.n_points += 4;
+
+ error = TT_Hint_Glyph( loader, 0 );
+ }
+
+ return error;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Process_Composite_Component */
+ /* */
+ /* <Description> */
+ /* Once a composite component has been loaded, it needs to be */
+ /* processed. Usually, this means transforming and translating. */
+ /* */
+ static FT_Error
+ TT_Process_Composite_Component( TT_Loader loader,
+ FT_SubGlyph subglyph,
+ FT_UInt start_point,
+ FT_UInt num_base_points )
+ {
+ FT_GlyphLoader gloader = loader->gloader;
+ FT_Vector* base_vec = gloader->base.outline.points;
+ FT_UInt num_points = gloader->base.outline.n_points;
+ FT_Bool have_scale;
+ FT_Pos x, y;
+
+
+ have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE |
+ WE_HAVE_AN_XY_SCALE |
+ WE_HAVE_A_2X2 ) );
+
+ /* perform the transform required for this subglyph */
+ if ( have_scale )
+ {
+ FT_UInt i;
+
+
+ for ( i = num_base_points; i < num_points; i++ )
+ FT_Vector_Transform( base_vec + i, &subglyph->transform );
+ }
+
+ /* get offset */
+ if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
+ {
+ FT_UInt k = subglyph->arg1;
+ FT_UInt l = subglyph->arg2;
+ FT_Vector* p1;
+ FT_Vector* p2;
+
+
+ /* match l-th point of the newly loaded component to the k-th point */
+ /* of the previously loaded components. */
+
+ /* change to the point numbers used by our outline */
+ k += start_point;
+ l += num_base_points;
+ if ( k >= num_base_points ||
+ l >= num_points )
+ return TT_Err_Invalid_Composite;
+
+ p1 = gloader->base.outline.points + k;
+ p2 = gloader->base.outline.points + l;
+
+ x = p1->x - p2->x;
+ y = p1->y - p2->y;
+ }
+ else
+ {
+ x = subglyph->arg1;
+ y = subglyph->arg2;
+
+ if ( !x && !y )
+ return TT_Err_Ok;
+
+ /* Use a default value dependent on */
+ /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */
+ /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */
+
+ if ( have_scale &&
+#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
+ !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )
+#else
+ ( subglyph->flags & SCALED_COMPONENT_OFFSET ) )
+#endif
+ {
+
+#if 0
+
+ /*************************************************************************/
+ /* */
+ /* This algorithm is what Apple documents. But it doesn't work. */
+ /* */
+ int a = subglyph->transform.xx > 0 ? subglyph->transform.xx
+ : -subglyph->transform.xx;
+ int b = subglyph->transform.yx > 0 ? subglyph->transform.yx
+ : -subglyph->transform.yx;
+ int c = subglyph->transform.xy > 0 ? subglyph->transform.xy
+ : -subglyph->transform.xy;
+ int d = subglyph->transform.yy > 0 ? subglyph->transform.yy
+ : -subglyph->transform.yy;
+ int m = a > b ? a : b;
+ int n = c > d ? c : d;
+
+
+ if ( a - b <= 33 && a - b >= -33 )
+ m *= 2;
+ if ( c - d <= 33 && c - d >= -33 )
+ n *= 2;
+ x = FT_MulFix( x, m );
+ y = FT_MulFix( y, n );
+
+#else /* 0 */
+
+ /*************************************************************************/
+ /* */
+ /* This algorithm is a guess and works much better than the above. */
+ /* */
+ FT_Fixed mac_xscale = FT_SqrtFixed(
+ FT_MulFix( subglyph->transform.xx,
+ subglyph->transform.xx ) +
+ FT_MulFix( subglyph->transform.xy,
+ subglyph->transform.xy ) );
+ FT_Fixed mac_yscale = FT_SqrtFixed(
+ FT_MulFix( subglyph->transform.yy,
+ subglyph->transform.yy ) +
+ FT_MulFix( subglyph->transform.yx,
+ subglyph->transform.yx ) );
+
+
+ x = FT_MulFix( x, mac_xscale );
+ y = FT_MulFix( y, mac_yscale );
+
+#endif /* 0 */
+
+ }
+
+ if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
+ {
+ FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
+ FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
+
+
+ x = FT_MulFix( x, x_scale );
+ y = FT_MulFix( y, y_scale );
+
+ if ( subglyph->flags & ROUND_XY_TO_GRID )
+ {
+ x = FT_PIX_ROUND( x );
+ y = FT_PIX_ROUND( y );
+ }
+ }
+ }
+
+ if ( x || y )
+ translate_array( num_points - num_base_points,
+ base_vec + num_base_points,
+ x, y );
+
+ return TT_Err_Ok;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Process_Composite_Glyph */
+ /* */
+ /* <Description> */
+ /* This is slightly different from TT_Process_Simple_Glyph, in that */
+ /* its sole purpose is to hint the glyph. Thus this function is */
+ /* only available when bytecode interpreter is enabled. */
+ /* */
+ static FT_Error
+ TT_Process_Composite_Glyph( TT_Loader loader,
+ FT_UInt start_point,
+ FT_UInt start_contour )
+ {
+ FT_Error error;
+ FT_Outline* outline;
+ FT_UInt i;
+
+
+ outline = &loader->gloader->base.outline;
+
+ /* make room for phantom points */
+ error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,
+ outline->n_points + 4,
+ 0 );
+ if ( error )
+ return error;
+
+ outline->points[outline->n_points ] = loader->pp1;
+ outline->points[outline->n_points + 1] = loader->pp2;
+ outline->points[outline->n_points + 2] = loader->pp3;
+ outline->points[outline->n_points + 3] = loader->pp4;
+
+ outline->tags[outline->n_points ] = 0;
+ outline->tags[outline->n_points + 1] = 0;
+ outline->tags[outline->n_points + 2] = 0;
+ outline->tags[outline->n_points + 3] = 0;
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+ {
+ FT_Stream stream = loader->stream;
+ FT_UShort n_ins;
+
+
+ /* TT_Load_Composite_Glyph only gives us the offset of instructions */
+ /* so we read them here */
+ if ( FT_STREAM_SEEK( loader->ins_pos ) ||
+ FT_READ_USHORT( n_ins ) )
+ return error;
+
+ FT_TRACE5(( " Instructions size = %d\n", n_ins ));
+
+ /* check it */
+ if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions )
+ {
+ FT_TRACE0(( "TT_Process_Composite_Glyph: Too many instructions (%d)\n",
+ n_ins ));
+
+ return TT_Err_Too_Many_Hints;
+ }
+ else if ( n_ins == 0 )
+ return TT_Err_Ok;
+
+ if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )
+ return error;
+
+ loader->glyph->control_data = loader->exec->glyphIns;
+ loader->glyph->control_len = n_ins;
+ }
+
+#endif
+
+ tt_prepare_zone( &loader->zone, &loader->gloader->base,
+ start_point, start_contour );
+
+ /* Some points are likely touched during execution of */
+ /* instructions on components. So let's untouch them. */
+ for ( i = start_point; i < loader->zone.n_points; i++ )
+ loader->zone.tags[i] &= ~( FT_CURVE_TAG_TOUCH_X |
+ FT_CURVE_TAG_TOUCH_Y );
+
+ loader->zone.n_points += 4;
+
+ return TT_Hint_Glyph( loader, 1 );
+ }
+
+
+ /* Calculate the four phantom points. */
+ /* The first two stand for horizontal origin and advance. */
+ /* The last two stand for vertical origin and advance. */
+#define TT_LOADER_SET_PP( loader ) \
+ do { \
+ (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \
+ (loader)->pp1.y = 0; \
+ (loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \
+ (loader)->pp2.y = 0; \
+ (loader)->pp3.x = 0; \
+ (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \
+ (loader)->pp4.x = 0; \
+ (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \
+ } while ( 0 )
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* load_truetype_glyph */
+ /* */
+ /* <Description> */
+ /* Loads a given truetype glyph. Handles composites and uses a */
+ /* TT_Loader object. */
+ /* */
+ static FT_Error
+ load_truetype_glyph( TT_Loader loader,
+ FT_UInt glyph_index,
+ FT_UInt recurse_count )
+ {
+ FT_Error error;
+ FT_Fixed x_scale, y_scale;
+ FT_ULong offset;
+ TT_Face face = (TT_Face)loader->face;
+ FT_GlyphLoader gloader = loader->gloader;
+ FT_Bool opened_frame = 0;
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+ FT_Vector* deltas = NULL;
+#endif
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+ FT_StreamRec inc_stream;
+ FT_Data glyph_data;
+ FT_Bool glyph_data_loaded = 0;
+#endif
+
+
+ /* some fonts have an incorrect value of `maxComponentDepth', */
+ /* thus we allow depth 1 to catch the majority of them */
+ if ( recurse_count > 1 &&
+ recurse_count > face->max_profile.maxComponentDepth )
+ {
+ error = TT_Err_Invalid_Composite;
+ goto Exit;
+ }
+
+ /* check glyph index */
+ if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
+ {
+ error = TT_Err_Invalid_Glyph_Index;
+ goto Exit;
+ }
+
+ loader->glyph_index = glyph_index;
+
+ if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+ {
+ x_scale = ((TT_Size)loader->size)->metrics.x_scale;
+ y_scale = ((TT_Size)loader->size)->metrics.y_scale;
+ }
+ else
+ {
+ x_scale = 0x10000L;
+ y_scale = 0x10000L;
+ }
+
+ /* get metrics, horizontal and vertical */
+ {
+ FT_Short left_bearing = 0, top_bearing = 0;
+ FT_UShort advance_width = 0, advance_height = 0;
+
+
+ TT_Get_HMetrics( face, glyph_index,
+ (FT_Bool)!( loader->load_flags &
+ FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
+ &left_bearing,
+ &advance_width );
+ TT_Get_VMetrics( face, glyph_index,
+ (FT_Bool)!( loader->load_flags &
+ FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
+ &top_bearing,
+ &advance_height );
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+ /* If this is an incrementally loaded font see if there are */
+ /* overriding metrics for this glyph. */
+ if ( face->root.internal->incremental_interface &&
+ face->root.internal->incremental_interface->funcs->get_glyph_metrics )
+ {
+ FT_Incremental_MetricsRec metrics;
+
+
+ metrics.bearing_x = left_bearing;
+ metrics.bearing_y = 0;
+ metrics.advance = advance_width;
+ error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
+ face->root.internal->incremental_interface->object,
+ glyph_index, FALSE, &metrics );
+ if ( error )
+ goto Exit;
+ left_bearing = (FT_Short)metrics.bearing_x;
+ advance_width = (FT_UShort)metrics.advance;
+
+#if 0
+
+ /* GWW: Do I do the same for vertical metrics? */
+ metrics.bearing_x = 0;
+ metrics.bearing_y = top_bearing;
+ metrics.advance = advance_height;
+ error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
+ face->root.internal->incremental_interface->object,
+ glyph_index, TRUE, &metrics );
+ if ( error )
+ goto Exit;
+ top_bearing = (FT_Short)metrics.bearing_y;
+ advance_height = (FT_UShort)metrics.advance;
+
+#endif /* 0 */
+
+ }
+
+#endif /* FT_CONFIG_OPTION_INCREMENTAL */
+
+ loader->left_bearing = left_bearing;
+ loader->advance = advance_width;
+ loader->top_bearing = top_bearing;
+ loader->vadvance = advance_height;
+
+ if ( !loader->linear_def )
+ {
+ loader->linear_def = 1;
+ loader->linear = advance_width;
+ }
+ }
+
+ /* Set `offset' to the start of the glyph relative to the start of */
+ /* the `glyf' table, and `byte_len' to the length of the glyph in */
+ /* bytes. */
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+ /* If we are loading glyph data via the incremental interface, set */
+ /* the loader stream to a memory stream reading the data returned */
+ /* by the interface. */
+ if ( face->root.internal->incremental_interface )
+ {
+ error = face->root.internal->incremental_interface->funcs->get_glyph_data(
+ face->root.internal->incremental_interface->object,
+ glyph_index, &glyph_data );
+ if ( error )
+ goto Exit;
+
+ glyph_data_loaded = 1;
+ offset = 0;
+ loader->byte_len = glyph_data.length;
+
+ FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) );
+ FT_Stream_OpenMemory( &inc_stream,
+ glyph_data.pointer, glyph_data.length );
+
+ loader->stream = &inc_stream;
+ }
+ else
+
+#endif /* FT_CONFIG_OPTION_INCREMENTAL */
+
+ offset = tt_face_get_location( face, glyph_index,
+ (FT_UInt*)&loader->byte_len );
+
+ if ( loader->byte_len > 0 )
+ {
+ error = face->access_glyph_frame( loader, glyph_index,
+ loader->glyf_offset + offset,
+ loader->byte_len );
+ if ( error )
+ goto Exit;
+
+ opened_frame = 1;
+
+ /* read first glyph header */
+ error = face->read_glyph_header( loader );
+ if ( error )
+ goto Exit;
+ }
+
+ if ( loader->byte_len == 0 || loader->n_contours == 0 )
+ {
+ loader->bbox.xMin = 0;
+ loader->bbox.xMax = 0;
+ loader->bbox.yMin = 0;
+ loader->bbox.yMax = 0;
+
+ TT_LOADER_SET_PP( loader );
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+
+ if ( ((TT_Face)(loader->face))->doblend )
+ {
+ /* this must be done before scaling */
+ FT_Memory memory = loader->face->memory;
+
+
+ error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
+ glyph_index, &deltas, 4 );
+ if ( error )
+ goto Exit;
+
+ loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y;
+ loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y;
+ loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y;
+ loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y;
+
+ FT_FREE( deltas );
+ }
+
+#endif
+
+ if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+ {
+ loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
+ loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
+ loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
+ loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
+ }
+
+ error = TT_Err_Ok;
+ goto Exit;
+ }
+
+ TT_LOADER_SET_PP( loader );
+
+ /***********************************************************************/
+ /***********************************************************************/
+ /***********************************************************************/
+
+ /* if it is a simple glyph, load it */
+
+ if ( loader->n_contours > 0 )
+ {
+ error = face->read_simple_glyph( loader );
+ if ( error )
+ goto Exit;
+
+ /* all data have been read */
+ face->forget_glyph_frame( loader );
+ opened_frame = 0;
+
+ error = TT_Process_Simple_Glyph( loader );
+ if ( error )
+ goto Exit;
+
+ FT_GlyphLoader_Add( gloader );
+ }
+
+ /***********************************************************************/
+ /***********************************************************************/
+ /***********************************************************************/
+
+ /* otherwise, load a composite! */
+ else if ( loader->n_contours == -1 )
+ {
+ FT_UInt start_point;
+ FT_UInt start_contour;
+ FT_ULong ins_pos; /* position of composite instructions, if any */
+
+
+ start_point = gloader->base.outline.n_points;
+ start_contour = gloader->base.outline.n_contours;
+
+ /* for each subglyph, read composite header */
+ error = face->read_composite_glyph( loader );
+ if ( error )
+ goto Exit;
+
+ /* store the offset of instructions */
+ ins_pos = loader->ins_pos;
+
+ /* all data we need are read */
+ face->forget_glyph_frame( loader );
+ opened_frame = 0;
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+
+ if ( face->doblend )
+ {
+ FT_Int i, limit;
+ FT_SubGlyph subglyph;
+ FT_Memory memory = face->root.memory;
+
+
+ /* this provides additional offsets */
+ /* for each component's translation */
+
+ if ( ( error = TT_Vary_Get_Glyph_Deltas(
+ face,
+ glyph_index,
+ &deltas,
+ gloader->current.num_subglyphs + 4 )) != 0 )
+ goto Exit;
+
+ subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs;
+ limit = gloader->current.num_subglyphs;
+
+ for ( i = 0; i < limit; ++i, ++subglyph )
+ {
+ if ( subglyph->flags & ARGS_ARE_XY_VALUES )
+ {
+ subglyph->arg1 += deltas[i].x;
+ subglyph->arg2 += deltas[i].y;
+ }
+ }
+
+ loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y;
+ loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y;
+ loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y;
+ loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y;
+
+ FT_FREE( deltas );
+ }
+
+#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
+
+ if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+ {
+ loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
+ loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
+ loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
+ loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
+ }
+
+ /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */
+ /* `as is' in the glyph slot (the client application will be */
+ /* responsible for interpreting these data)... */
+ if ( loader->load_flags & FT_LOAD_NO_RECURSE )
+ {
+ FT_GlyphLoader_Add( gloader );
+ loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;
+
+ goto Exit;
+ }
+
+ /*********************************************************************/
+ /*********************************************************************/
+ /*********************************************************************/
+
+ {
+ FT_UInt n, num_base_points;
+ FT_SubGlyph subglyph = 0;
+
+ FT_UInt num_points = start_point;
+ FT_UInt num_subglyphs = gloader->current.num_subglyphs;
+ FT_UInt num_base_subgs = gloader->base.num_subglyphs;
+
+ FT_Stream old_stream = loader->stream;
+
+
+ FT_GlyphLoader_Add( gloader );
+
+ /* read each subglyph independently */
+ for ( n = 0; n < num_subglyphs; n++ )
+ {
+ FT_Vector pp[4];
+
+
+
+ /* Each time we call load_truetype_glyph in this loop, the */
+ /* value of `gloader.base.subglyphs' can change due to table */
+ /* reallocations. We thus need to recompute the subglyph */
+ /* pointer on each iteration. */
+ subglyph = gloader->base.subglyphs + num_base_subgs + n;
+
+ pp[0] = loader->pp1;
+ pp[1] = loader->pp2;
+ pp[2] = loader->pp3;
+ pp[3] = loader->pp4;
+
+ num_base_points = gloader->base.outline.n_points;
+
+ error = load_truetype_glyph( loader, subglyph->index,
+ recurse_count + 1 );
+ if ( error )
+ goto Exit;
+
+ /* restore subglyph pointer */
+ subglyph = gloader->base.subglyphs + num_base_subgs + n;
+
+ if ( !( subglyph->flags & USE_MY_METRICS ) )
+ {
+ loader->pp1 = pp[0];
+ loader->pp2 = pp[1];
+ loader->pp3 = pp[2];
+ loader->pp4 = pp[3];
+ }
+
+ num_points = gloader->base.outline.n_points;
+
+ if ( num_points == num_base_points )
+ continue;
+
+ /* gloader->base.outline consists of three parts: */
+ /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */
+ /* */
+ /* (1): exists from the beginning */
+ /* (2): components that have been loaded so far */
+ /* (3): the newly loaded component */
+ TT_Process_Composite_Component( loader, subglyph, start_point,
+ num_base_points );
+ }
+
+ loader->stream = old_stream;
+
+ /* process the glyph */
+ loader->ins_pos = ins_pos;
+ if ( IS_HINTED( loader->load_flags ) &&
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+ subglyph->flags & WE_HAVE_INSTR &&
+
+#endif
+
+ num_points > start_point )
+ TT_Process_Composite_Glyph( loader, start_point, start_contour );
+
+ }
+ }
+ else
+ {
+ /* invalid composite count (negative but not -1) */
+ error = TT_Err_Invalid_Outline;
+ goto Exit;
+ }
+
+ /***********************************************************************/
+ /***********************************************************************/
+ /***********************************************************************/
+
+ Exit:
+
+ if ( opened_frame )
+ face->forget_glyph_frame( loader );
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+ if ( glyph_data_loaded )
+ face->root.internal->incremental_interface->funcs->free_glyph_data(
+ face->root.internal->incremental_interface->object,
+ &glyph_data );
+
+#endif
+
+ return error;
+ }
+
+
+ static FT_Error
+ compute_glyph_metrics( TT_Loader loader,
+ FT_UInt glyph_index )
+ {
+ FT_BBox bbox;
+ TT_Face face = (TT_Face)loader->face;
+ FT_Fixed y_scale;
+ TT_GlyphSlot glyph = loader->glyph;
+ TT_Size size = (TT_Size)loader->size;
+
+
+ y_scale = 0x10000L;
+ if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+ y_scale = size->root.metrics.y_scale;
+
+ if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
+ FT_Outline_Get_CBox( &glyph->outline, &bbox );
+ else
+ bbox = loader->bbox;
+
+ /* get the device-independent horizontal advance; it is scaled later */
+ /* by the base layer. */
+ {
+ FT_Pos advance = loader->linear;
+
+
+ /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */
+ /* correctly support DynaLab fonts, which have an incorrect */
+ /* `advance_Width_Max' field! It is used, to my knowledge, */
+ /* exclusively in the X-TrueType font server. */
+ /* */
+ if ( face->postscript.isFixedPitch &&
+ ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
+ advance = face->horizontal.advance_Width_Max;
+
+ /* we need to return the advance in font units in linearHoriAdvance, */
+ /* it will be scaled later by the base layer. */
+ glyph->linearHoriAdvance = advance;
+ }
+
+ glyph->metrics.horiBearingX = bbox.xMin;
+ glyph->metrics.horiBearingY = bbox.yMax;
+ glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
+
+ /* Now take care of vertical metrics. In the case where there is */
+ /* no vertical information within the font (relatively common), make */
+ /* up some metrics by `hand'... */
+
+ {
+ FT_Pos top; /* scaled vertical top side bearing */
+ FT_Pos advance; /* scaled vertical advance height */
+
+
+ /* Get the unscaled top bearing and advance height. */
+ if ( face->vertical_info &&
+ face->vertical.number_Of_VMetrics > 0 )
+ {
+ top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax,
+ y_scale );
+
+ if ( loader->pp3.y <= loader->pp4.y )
+ advance = 0;
+ else
+ advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y,
+ y_scale );
+ }
+ else
+ {
+ FT_Pos height;
+
+
+ /* XXX Compute top side bearing and advance height in */
+ /* Get_VMetrics instead of here. */
+
+ /* NOTE: The OS/2 values are the only `portable' ones, */
+ /* which is why we use them, if there is an OS/2 */
+ /* table in the font. Otherwise, we use the */
+ /* values defined in the horizontal header. */
+
+ height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin,
+ y_scale );
+ if ( face->os2.version != 0xFFFFU )
+ advance = (FT_Pos)( face->os2.sTypoAscender -
+ face->os2.sTypoDescender );
+ else
+ advance = (FT_Pos)( face->horizontal.Ascender -
+ face->horizontal.Descender );
+
+ top = ( advance - height ) / 2;
+ }
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+ {
+ FT_Incremental_InterfaceRec* incr;
+ FT_Incremental_MetricsRec metrics;
+ FT_Error error;
+
+
+ incr = face->root.internal->incremental_interface;
+
+ /* If this is an incrementally loaded font see if there are */
+ /* overriding metrics for this glyph. */
+ if ( incr && incr->funcs->get_glyph_metrics )
+ {
+ metrics.bearing_x = 0;
+ metrics.bearing_y = top;
+ metrics.advance = advance;
+
+ error = incr->funcs->get_glyph_metrics( incr->object,
+ glyph_index,
+ TRUE,
+ &metrics );
+ if ( error )
+ return error;
+
+ top = metrics.bearing_y;
+ advance = metrics.advance;
+ }
+ }
+
+ /* GWW: Do vertical metrics get loaded incrementally too? */
+
+#endif /* FT_CONFIG_OPTION_INCREMENTAL */
+
+ glyph->linearVertAdvance = advance;
+
+ /* scale the metrics */
+ if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
+ {
+ top = FT_MulFix( top, y_scale );
+ advance = FT_MulFix( advance, y_scale );
+ }
+
+ /* XXX: for now, we have no better algorithm for the lsb, but it */
+ /* should work fine. */
+ /* */
+ glyph->metrics.vertBearingX = ( bbox.xMin - bbox.xMax ) / 2;
+ glyph->metrics.vertBearingY = top;
+ glyph->metrics.vertAdvance = advance;
+ }
+
+ /* adjust advance width to the value contained in the hdmx table */
+ if ( !face->postscript.isFixedPitch &&
+ IS_HINTED( loader->load_flags ) )
+ {
+ FT_Byte* widthp;
+
+
+ widthp = tt_face_get_device_metrics( face,
+ size->root.metrics.x_ppem,
+ glyph_index );
+
+ if ( widthp )
+ glyph->metrics.horiAdvance = *widthp << 6;
+ }
+
+ /* set glyph dimensions */
+ glyph->metrics.width = bbox.xMax - bbox.xMin;
+ glyph->metrics.height = bbox.yMax - bbox.yMin;
+
+ return 0;
+ }
+
+
+#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
+
+ static FT_Error
+ load_sbit_image( TT_Size size,
+ TT_GlyphSlot glyph,
+ FT_UInt glyph_index,
+ FT_Int32 load_flags )
+ {
+ TT_Face face;
+ SFNT_Service sfnt;
+ FT_Stream stream;
+ FT_Error error;
+ TT_SBit_MetricsRec metrics;
+
+
+ face = (TT_Face)glyph->face;
+ sfnt = (SFNT_Service)face->sfnt;
+ stream = face->root.stream;
+
+ error = sfnt->load_sbit_image( face,
+ size->strike_index,
+ glyph_index,
+ (FT_Int)load_flags,
+ stream,
+ &glyph->bitmap,
+ &metrics );
+ if ( !error )
+ {
+ glyph->outline.n_points = 0;
+ glyph->outline.n_contours = 0;
+
+ glyph->metrics.width = (FT_Pos)metrics.width << 6;
+ glyph->metrics.height = (FT_Pos)metrics.height << 6;
+
+ glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6;
+ glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6;
+ glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6;
+
+ glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6;
+ glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6;
+ glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6;
+
+ glyph->format = FT_GLYPH_FORMAT_BITMAP;
+ if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
+ {
+ glyph->bitmap_left = metrics.vertBearingX;
+ glyph->bitmap_top = metrics.vertBearingY;
+ }
+ else
+ {
+ glyph->bitmap_left = metrics.horiBearingX;
+ glyph->bitmap_top = metrics.horiBearingY;
+ }
+ }
+
+ return error;
+ }
+
+#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
+
+
+ static FT_Error
+ tt_loader_init( TT_Loader loader,
+ TT_Size size,
+ TT_GlyphSlot glyph,
+ FT_Int32 load_flags )
+ {
+ TT_Face face;
+ FT_Stream stream;
+
+
+ face = (TT_Face)glyph->face;
+ stream = face->root.stream;
+
+ FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) );
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+ /* load execution context */
+ if ( IS_HINTED( load_flags ) )
+ {
+ TT_ExecContext exec;
+ FT_Bool grayscale;
+
+
+ if ( !size->cvt_ready )
+ {
+ FT_Error error = tt_size_ready_bytecode( size );
+ if ( error )
+ return error;
+ }
+
+ /* query new execution context */
+ exec = size->debug ? size->context
+ : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
+ if ( !exec )
+ return TT_Err_Could_Not_Find_Context;
+
+ grayscale =
+ FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO );
+
+ TT_Load_Context( exec, face, size );
+
+ /* a change from mono to grayscale rendering (and vice versa) */
+ /* requires a re-execution of the CVT program */
+ if ( grayscale != exec->grayscale )
+ {
+ FT_UInt i;
+
+
+ exec->grayscale = grayscale;
+
+ for ( i = 0; i < size->cvt_size; i++ )
+ size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
+ tt_size_run_prep( size );
+ }
+
+ /* see whether the cvt program has disabled hinting */
+ if ( exec->GS.instruct_control & 1 )
+ load_flags |= FT_LOAD_NO_HINTING;
+
+ /* load default graphics state -- if needed */
+ if ( exec->GS.instruct_control & 2 )
+ exec->GS = tt_default_graphics_state;
+
+ exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
+ loader->exec = exec;
+ loader->instructions = exec->glyphIns;
+ }
+
+#endif /* TT_USE_BYTECODE_INTERPRETER */
+
+ /* seek to the beginning of the glyph table -- for Type 42 fonts */
+ /* the table might be accessed from a Postscript stream or something */
+ /* else... */
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+ if ( face->root.internal->incremental_interface )
+ loader->glyf_offset = 0;
+ else
+
+#endif
+
+ {
+ FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 );
+
+
+ if ( error )
+ {
+ FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" ));
+ return error;
+ }
+ loader->glyf_offset = FT_STREAM_POS();
+ }
+
+ /* get face's glyph loader */
+ {
+ FT_GlyphLoader gloader = glyph->internal->loader;
+
+
+ FT_GlyphLoader_Rewind( gloader );
+ loader->gloader = gloader;
+ }
+
+ loader->load_flags = load_flags;
+
+ loader->face = (FT_Face)face;
+ loader->size = (FT_Size)size;
+ loader->glyph = (FT_GlyphSlot)glyph;
+ loader->stream = stream;
+
+ return TT_Err_Ok;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* TT_Load_Glyph */
+ /* */
+ /* <Description> */
+ /* A function used to load a single glyph within a given glyph slot, */
+ /* for a given size. */
+ /* */
+ /* <Input> */
+ /* glyph :: A handle to a target slot object where the glyph */
+ /* will be loaded. */
+ /* */
+ /* size :: A handle to the source face size at which the glyph */
+ /* must be scaled/loaded. */
+ /* */
+ /* glyph_index :: The index of the glyph in the font file. */
+ /* */
+ /* load_flags :: A flag indicating what to load for this glyph. The */
+ /* FT_LOAD_XXX constants can be used to control the */
+ /* glyph loading process (e.g., whether the outline */
+ /* should be scaled, whether to load bitmaps or not, */
+ /* whether to hint the outline, etc). */
+ /* */
+ /* <Return> */
+ /* FreeType error code. 0 means success. */
+ /* */
+ FT_LOCAL_DEF( FT_Error )
+ TT_Load_Glyph( TT_Size size,
+ TT_GlyphSlot glyph,
+ FT_UInt glyph_index,
+ FT_Int32 load_flags )
+ {
+ TT_Face face;
+ FT_Error error;
+ TT_LoaderRec loader;
+
+
+ face = (TT_Face)glyph->face;
+ error = TT_Err_Ok;
+
+#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
+
+ /* try to load embedded bitmap if any */
+ /* */
+ /* XXX: The convention should be emphasized in */
+ /* the documents because it can be confusing. */
+ if ( size->strike_index != 0xFFFFFFFFUL &&
+ ( load_flags & FT_LOAD_NO_BITMAP ) == 0 )
+ {
+ error = load_sbit_image( size, glyph, glyph_index, load_flags );
+ if ( !error )
+ return TT_Err_Ok;
+ }
+
+#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
+
+ /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */
+ if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid )
+ return TT_Err_Invalid_Size_Handle;
+
+ if ( load_flags & FT_LOAD_SBITS_ONLY )
+ return TT_Err_Invalid_Argument;
+
+ error = tt_loader_init( &loader, size, glyph, load_flags );
+ if ( error )
+ return error;
+
+ glyph->format = FT_GLYPH_FORMAT_OUTLINE;
+ glyph->num_subglyphs = 0;
+ glyph->outline.flags = 0;
+
+ /* main loading loop */
+ error = load_truetype_glyph( &loader, glyph_index, 0 );
+ if ( !error )
+ {
+ if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE )
+ {
+ glyph->num_subglyphs = loader.gloader->base.num_subglyphs;
+ glyph->subglyphs = loader.gloader->base.subglyphs;
+ }
+ else
+ {
+ glyph->outline = loader.gloader->base.outline;
+ glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS;
+
+ /* In case bit 1 of the `flags' field in the `head' table isn't */
+ /* set, translate array so that (0,0) is the glyph's origin. */
+ if ( ( face->header.Flags & 2 ) == 0 && loader.pp1.x )
+ FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 );
+ }
+
+ compute_glyph_metrics( &loader, glyph_index );
+ }
+
+ /* Set the `high precision' bit flag. */
+ /* This is _critical_ to get correct output for monochrome */
+ /* TrueType glyphs at all sizes using the bytecode interpreter. */
+ /* */
+ if ( !( load_flags & FT_LOAD_NO_SCALE ) &&
+ size->root.metrics.y_ppem < 24 )
+ glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
+
+ return error;
+ }
+
+
+/* END */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-01 05:00:17 +0000