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