/******************************************************************* * * ttgload.c 1.0 * * TrueType Glyph Loader. * * Copyright 1996-1998 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 "tttypes.h" #include "ttdebug.h" #include "ttcalc.h" #include "ttfile.h" #include "tttables.h" #include "ttobjs.h" #include "ttgload.h" #include "ttmemory.h" #include "tttags.h" #include "ttload.h" /* required by the tracing mode */ #undef TT_COMPONENT #define TT_COMPONENT trace_gload /* 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 /********************************************************/ /* Return 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). */ /* */ /* This function will much probably move to another */ /* component in the short future, but I haven't decided */ /* which yet... */ LOCAL_FUNC void TT_Get_Metrics( TT_Horizontal_Header* header, UShort index, Short* bearing, UShort* advance ) { PLongMetrics longs_m; UShort k = header->number_Of_HMetrics; if ( index < k ) { longs_m = (PLongMetrics)header->long_metrics + index; *bearing = longs_m->bearing; *advance = longs_m->advance; } else { *bearing = ((PShortMetrics)header->short_metrics)[index - k]; *advance = ((PLongMetrics)header->long_metrics)[k - 1].advance; } } /********************************************************/ /* Return horizontal metrics in font units for a given */ /* glyph. If "check" is true, take care of mono-spaced */ /* fonts by returning the advance width max. */ static void Get_HMetrics( PFace face, UShort index, Bool check, Short* lsb, UShort* aw ) { TT_Get_Metrics( &face->horizontalHeader, index, lsb, aw ); if ( check && face->postscript.isFixedPitch ) *aw = face->horizontalHeader.advance_Width_Max; } /********************************************************/ /* Return advance width table for a given pixel size */ /* if it is found in the font's "hdmx" table (if any). */ static PByte Get_Advance_Widths( PFace face, UShort ppem ) { 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; } /********************************************************/ /* Copy current glyph into original one. */ #define cur_to_org( n, zone ) \ MEM_Copy( (zone)->org, (zone)->cur, (n) * sizeof ( TT_Vector ) ) /********************************************************/ /* copy original glyph into current one */ #define org_to_cur( n, zone ) \ MEM_Copy( (zone)->cur, (zone)->org, (n) * sizeof ( TT_Vector ) ) /********************************************************/ /* translate an array of coordinates */ static void translate_array( UShort n, TT_Vector* coords, TT_Pos delta_x, TT_Pos delta_y ) { UShort 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; } /********************************************************/ /* mount one zone on top of another */ static void mount_zone( PGlyph_Zone source, PGlyph_Zone target ) { UShort np; Short nc; np = source->n_points; nc = source->n_contours; target->org = source->org + np; target->cur = source->cur + np; target->touch = source->touch + np; target->contours = source->contours + nc; target->n_points = 0; target->n_contours = 0; } /******************************************************************* * * Function: Load_Simple_Glyph * ******************************************************************/ static TT_Error Load_Simple_Glyph( PExecution_Context exec, TT_Stream input, Short n_contours, Short left_contours, UShort left_points, UShort load_flags, PSubglyph_Record subg ) { DEFINE_LOAD_LOCALS( input ); PGlyph_Zone pts; Short k; UShort j; UShort n_points, n_ins; PFace face; Byte* flag; TT_Vector* vec; TT_F26Dot6 x, y; face = exec->face; /* simple check */ if ( n_contours > left_contours ) { PTRACE0(( "ERROR: Glyph index %ld has %d contours > left %d\n", subg->index, n_contours, left_contours )); return TT_Err_Too_Many_Contours; } /* preparing the execution context */ mount_zone( &subg->zone, &exec->pts ); /* reading the contours endpoints */ if ( ACCESS_Frame( (n_contours + 1) * 2L ) ) return error; for ( k = 0; k < n_contours; k++ ) { PTRACE4(( "%d ", n_points )); exec->pts.contours[k] = GET_UShort(); } if ( n_contours > 0 ) n_points = exec->pts.contours[n_contours - 1] + 1; else n_points = 0; n_ins = GET_UShort(); FORGET_Frame(); if ( n_points > left_points ) { PTRACE0(( "ERROR: Too many points in glyph %ld\n", subg->index )); return TT_Err_Too_Many_Points; } /* loading instructions */ PTRACE4(( "Instructions size : %d\n", n_ins )); if ( n_ins > face->maxProfile.maxSizeOfInstructions ) { PTRACE0(( "ERROR: Too many instructions!\n" )); return TT_Err_Too_Many_Ins; } if ( FILE_Read( exec->glyphIns, n_ins ) ) return error; if ( (error = Set_CodeRange( exec, TT_CodeRange_Glyph, exec->glyphIns, n_ins )) != TT_Err_Ok ) return error; /* read the flags */ if ( CHECK_ACCESS_Frame( n_points * 5L ) ) return error; j = 0; flag = exec->pts.touch; while ( j < n_points ) { Byte c, cnt; flag[j] = c = GET_Byte(); j++; if ( c & 8 ) { cnt = GET_Byte(); while( cnt > 0 ) { flag[j++] = c; cnt--; } } } /* read the X */ x = 0; vec = exec->pts.org; for ( j = 0; j < n_points; j++ ) { if ( flag[j] & 2 ) { if ( flag[j] & 16 ) x += GET_Byte(); else x -= GET_Byte(); } else { if ( (flag[j] & 16) == 0 ) x += GET_Short(); } vec[j].x = x; } /* read the Y */ y = 0; for ( j = 0; j < n_points; j++ ) { if ( flag[j] & 4 ) { if ( flag[j] & 32 ) y += GET_Byte(); else y -= GET_Byte(); } else { if ( (flag[j] & 32) == 0 ) y += GET_Short(); } vec[j].y = y; } FORGET_Frame(); /* Now add the two shadow points at n and n + 1. */ /* We need the left side bearing and advance width. */ /* pp1 = xMin - lsb */ vec[n_points].x = subg->metrics.bbox.xMin - subg->metrics.horiBearingX; vec[n_points].y = 0; /* pp2 = pp1 + aw */ vec[n_points+1].x = vec[n_points].x + subg->metrics.horiAdvance; vec[n_points+1].y = 0; /* clear the touch flags */ for ( j = 0; j < n_points; j++ ) exec->pts.touch[j] &= TT_Flag_On_Curve; exec->pts.touch[n_points ] = 0; exec->pts.touch[n_points + 1] = 0; /* Note that we return two more points that are not */ /* part of the glyph outline. */ n_points += 2; /* now eventually scale and hint the glyph */ pts = &exec->pts; pts->n_points = n_points; pts->n_contours = n_contours; if ( (load_flags & TTLOAD_SCALE_GLYPH) == 0 ) { /* no scaling, just copy the orig arrays into the cur ones */ org_to_cur( n_points, pts ); } else { /* first scale the glyph points */ for ( j = 0; j < n_points; j++ ) { pts->org[j].x = Scale_X( &exec->metrics, pts->org[j].x ); pts->org[j].y = Scale_Y( &exec->metrics, pts->org[j].y ); } /* if hinting, round pp1, and shift the glyph accordingly */ if ( subg->is_hinted ) { x = pts->org[n_points - 2].x; x = ((x+32) & -64) - x; translate_array( n_points, pts->org, x, 0 ); org_to_cur( n_points, pts ); pts->cur[n_points - 1].x = (pts->cur[n_points - 1].x + 32) & -64; /* now consider hinting */ if ( n_ins > 0 ) { exec->is_composite = FALSE; if ( (error = Context_Run( exec, FALSE )) != TT_Err_Ok ) return error; } } else org_to_cur( n_points, pts ); } /* save glyph phantom points */ if (!subg->preserve_pps) { subg->pp1 = pts->cur[n_points - 2]; subg->pp2 = pts->cur[n_points - 1]; } return TT_Err_Ok; } /******************************************************************* * * Function : Load_Composite_End * ******************************************************************/ static TT_Error Load_Composite_End( UShort n_points, Short n_contours, PExecution_Context exec, PSubglyph_Record subg, TT_Stream input ) { DEFINE_LOAD_LOCALS( input ); UShort k, n_ins; PGlyph_Zone pts; if ( subg->is_hinted && subg->element_flag & WE_HAVE_INSTR ) { if ( ACCESS_Frame( 2L ) ) return error; n_ins = GET_UShort(); /* read size of instructions */ FORGET_Frame(); PTRACE4(( "Instructions size = %d\n", n_ins )); if ( n_ins > exec->face->maxProfile.maxSizeOfInstructions ) { PTRACE0(( "Too many instructions in composite glyph %ld\n", subg->index )); return TT_Err_Too_Many_Ins; } if ( FILE_Read( exec->glyphIns, n_ins ) ) return error; error = Set_CodeRange( exec, TT_CodeRange_Glyph, exec->glyphIns, n_ins ); if ( error ) return error; } else n_ins = 0; /* prepare the execution context */ n_points += 2; exec->pts = subg->zone; pts = &exec->pts; pts->n_points = n_points; pts->n_contours = n_contours; /* add phantom points */ pts->cur[n_points - 2] = subg->pp1; pts->cur[n_points - 1] = subg->pp2; pts->touch[n_points - 1] = 0; pts->touch[n_points - 2] = 0; /* if hinting, round the phantom points */ if ( subg->is_hinted ) { pts->cur[n_points - 2].x = (subg->pp1.x + 32) & -64; pts->cur[n_points - 1].x = (subg->pp2.x + 32) & -64; } for ( k = 0; k < n_points; k++ ) pts->touch[k] &= TT_Flag_On_Curve; cur_to_org( n_points, pts ); /* now consider hinting */ if ( subg->is_hinted && n_ins > 0 ) { exec->is_composite = TRUE; if ( (error = Context_Run( exec, FALSE )) != TT_Err_Ok ) return error; } /* save glyph origin and advance points */ subg->pp1 = pts->cur[n_points - 2]; subg->pp2 = pts->cur[n_points - 1]; return TT_Err_Ok; } /******************************************************************* * * Function : Init_Glyph_Component * ******************************************************************/ static void Init_Glyph_Component( PSubglyph_Record element, PSubglyph_Record original, PExecution_Context exec ) { element->index = -1; element->is_scaled = FALSE; element->is_hinted = FALSE; if ( original ) mount_zone( &original->zone, &element->zone ); else element->zone = exec->pts; element->zone.n_contours = 0; element->zone.n_points = 0; element->arg1 = 0; element->arg2 = 0; element->element_flag = 0; element->preserve_pps = FALSE; element->transform.xx = 1 << 16; element->transform.xy = 0; element->transform.yx = 0; element->transform.yy = 1 << 16; element->transform.ox = 0; element->transform.oy = 0; element->metrics.horiBearingX = 0; element->metrics.horiAdvance = 0; } LOCAL_FUNC TT_Error Load_TrueType_Glyph( PInstance instance, PGlyph glyph, UShort glyph_index, UShort load_flags ) { enum TPhases_ { Load_Exit, Load_Glyph, Load_Header, Load_Simple, Load_Composite, Load_End }; typedef enum TPhases_ TPhases; DEFINE_ALL_LOCALS; PFace face; UShort num_points; Short num_contours; UShort left_points; Short left_contours; Long table; UShort load_top; Long k, l; UShort new_flags; Long index; UShort u, v; Long glyph_offset, offset; TT_F26Dot6 x, y, nx, ny; Fixed xx, xy, yx, yy; PExecution_Context exec; PSubglyph_Record subglyph, subglyph2; TGlyph_Zone base_pts; TPhases phase; PByte widths; /* TT_Glyph_Loader_Callback cacheCb; */ /* TT_Outline cached_outline; */ /* first of all, check arguments */ if ( !glyph ) return TT_Err_Invalid_Glyph_Handle; face = glyph->face; if ( !face ) return TT_Err_Invalid_Glyph_Handle; if ( glyph_index >= face->numGlyphs ) return TT_Err_Invalid_Glyph_Index; if ( instance && (load_flags & TTLOAD_SCALE_GLYPH) == 0 ) { instance = 0; load_flags &= ~( TTLOAD_SCALE_GLYPH | TTLOAD_HINT_GLYPH ); } table = TT_LookUp_Table( face, TTAG_glyf ); if ( table < 0 ) { PTRACE0(( "ERROR: there is no glyph table in this font file!\n" )); return TT_Err_Table_Missing; } glyph_offset = face->dirTables[table].Offset; /* query new execution context */ if ( instance && instance->debug ) exec = instance->context; else exec = New_Context( face ); if ( !exec ) return TT_Err_Could_Not_Find_Context; Context_Load( exec, face, instance ); if ( instance ) { if ( instance->GS.instruct_control & 2 ) exec->GS = Default_GraphicsState; else exec->GS = instance->GS; /* load default graphics state */ glyph->outline.high_precision = ( instance->metrics.y_ppem < 24 ); } /* save its critical pointers, as they'll be modified during load */ base_pts = exec->pts; /* init variables */ left_points = face->maxPoints; left_contours = face->maxContours; num_points = 0; num_contours = 0; load_top = 0; subglyph = exec->loadStack; Init_Glyph_Component( subglyph, NULL, exec ); subglyph->index = glyph_index; subglyph->is_hinted = load_flags & TTLOAD_HINT_GLYPH; /* when the cvt program has disabled hinting, the argument */ /* is ignored. */ if ( instance && instance->GS.instruct_control & 1 ) subglyph->is_hinted = FALSE; /* now access stream */ if ( USE_Stream( face->stream, stream ) ) goto Fin; /* Main loading loop */ phase = Load_Glyph; index = 0; while ( phase != Load_Exit ) { subglyph = exec->loadStack + load_top; switch ( phase ) { /************************************************************/ /* */ /* Load_Glyph state */ /* */ /* reading a glyph's generic header to determine */ /* wether it's simple or composite */ /* */ /* exit states: Load_Header and Load_End */ case Load_Glyph: /* check glyph index and table */ index = subglyph->index; if ( index < 0 || index >= face->numGlyphs ) { error = TT_Err_Invalid_Glyph_Index; goto Fail; } /* get horizontal metrics */ { Short left_bearing; UShort advance_width; Get_HMetrics( face, index, TRUE, &left_bearing, &advance_width ); subglyph->metrics.horiBearingX = left_bearing; subglyph->metrics.horiAdvance = advance_width; } phase = Load_Header; /* The cache callback isn't part of the FreeType release yet */ /* It is discarded for the moment.. */ /* */ #if 0 if ( instance ) { /* is the glyph in an outline cache ? */ cacheCb = instance->owner->engine->glCallback; if ( cacheCb && 0 ) /* disabled */ { /* we have a callback */ error = cacheCb( instance->generic, index, &cached_outline, &x, &y ); if ( !error ) { /* no error, then append the outline to the current subglyph */ /* error = Append_Outline( subglyph, &left_points, &left_contours, &cached_outline ); */ phase = Load_End; } } } #endif break; /************************************************************/ /* */ /* Load_Header state */ /* */ /* reading a glyph's generic header to determine */ /* wether it's simple or composite */ /* */ /* exit states: Load_Simple and Load_Composite */ case Load_Header : /* load glyph */ if ( index + 1 < face->numLocations && face->glyphLocations[index] == face->glyphLocations[index + 1] ) { /* as described by Frederic Loyer, these are spaces, and */ /* not the unknown glyph. */ num_contours = 0; num_points = 0; subglyph->metrics.bbox.xMin = 0; subglyph->metrics.bbox.xMax = 0; subglyph->metrics.bbox.yMin = 0; subglyph->metrics.bbox.yMax = 0; subglyph->pp1.x = 0; subglyph->pp2.x = subglyph->metrics.horiAdvance; if (load_flags & TTLOAD_SCALE_GLYPH) subglyph->pp2.x = Scale_X( &exec->metrics, subglyph->pp2.x ); exec->glyphSize = 0; phase = Load_End; break; } offset = glyph_offset + face->glyphLocations[index]; /* read first glyph header */ if ( FILE_Seek( offset ) || ACCESS_Frame( 10L ) ) goto Fail_File; num_contours = GET_Short(); subglyph->metrics.bbox.xMin = GET_Short(); subglyph->metrics.bbox.yMin = GET_Short(); subglyph->metrics.bbox.xMax = GET_Short(); subglyph->metrics.bbox.yMax = GET_Short(); FORGET_Frame(); PTRACE6(( "Glyph %ld\n", index )); PTRACE6(( " # of contours : %d\n", num_contours )); PTRACE6(( " xMin: %4d xMax: %4d\n", subglyph->metrics.bbox.xMin, subglyph->metrics.bbox.xMax )); PTRACE6(( " yMin: %4d yMax: %4d\n", subglyph->metrics.bbox.yMin, subglyph->metrics.bbox.yMax )); PTRACE6(( "-" )); if ( num_contours > left_contours ) { PTRACE0(( "ERROR: Too many contours for glyph %ld\n", index )); error = TT_Err_Too_Many_Contours; goto Fail; } subglyph->pp1.x = subglyph->metrics.bbox.xMin - subglyph->metrics.horiBearingX; subglyph->pp1.y = 0; subglyph->pp2.x = subglyph->pp1.x + subglyph->metrics.horiAdvance; if (load_flags & TTLOAD_SCALE_GLYPH) { subglyph->pp1.x = Scale_X( &exec->metrics, subglyph->pp1.x ); subglyph->pp2.x = Scale_X( &exec->metrics, subglyph->pp2.x ); } /* is it a simple glyph ? */ if ( num_contours > 0 ) phase = Load_Simple; else phase = Load_Composite; break; /************************************************************/ /* */ /* Load_Simple state */ /* */ /* reading a simple glyph (num_contours must be set to */ /* the glyph's number of contours.) */ /* */ /* exit states : Load_End */ /* */ case Load_Simple: new_flags = load_flags; /* disable hinting when scaling */ if ( !subglyph->is_hinted ) new_flags &= ~TTLOAD_HINT_GLYPH; error = Load_Simple_Glyph( exec, stream, num_contours, left_contours, left_points, new_flags, subglyph ); if ( error ) goto Fail; /* Note: We could have put the simple loader source there */ /* but the code is fat enough already :-) */ num_points = exec->pts.n_points - 2; phase = Load_End; break; /************************************************************/ /* */ /* Load_Composite state */ /* */ /* reading a composite glyph header a pushing a new */ /* load element on the stack. */ /* */ /* exit states: Load_Glyph */ /* */ case Load_Composite: /* create a new element on the stack */ load_top++; if ( load_top > face->maxComponents ) { error = TT_Err_Invalid_Composite; goto Fail; } subglyph2 = exec->loadStack + load_top; Init_Glyph_Component( subglyph2, subglyph, NULL ); subglyph2->is_hinted = subglyph->is_hinted; /* now read composite header */ if ( ACCESS_Frame( 4L ) ) goto Fail_File; subglyph->element_flag = new_flags = GET_UShort(); subglyph2->index = GET_UShort(); FORGET_Frame(); k = 2; if ( new_flags & ARGS_ARE_WORDS ) k += 2; if ( new_flags & WE_HAVE_A_SCALE ) k += 2; if ( new_flags & WE_HAVE_AN_XY_SCALE ) k += 4; if ( new_flags & WE_HAVE_A_2X2 ) k += 8; if ( ACCESS_Frame( k ) ) goto Fail_File; if ( new_flags & ARGS_ARE_WORDS ) { k = GET_Short(); l = GET_Short(); } else { l = GET_UShort(); k = (Char)(l >> 8); l = (Char)(l & 0xFF); } subglyph->arg1 = k; subglyph->arg2 = l; if ( new_flags & ARGS_ARE_XY_VALUES ) { subglyph->transform.ox = k; subglyph->transform.oy = l; } xx = 1 << 16; xy = 0; yx = 0; yy = 1 << 16; if ( new_flags & WE_HAVE_A_SCALE ) { xx = (Fixed)GET_Short() << 2; yy = xx; subglyph2->is_scaled = TRUE; } else if ( new_flags & WE_HAVE_AN_XY_SCALE ) { xx = (Fixed)GET_Short() << 2; yy = (Fixed)GET_Short() << 2; subglyph2->is_scaled = TRUE; } else if ( new_flags & WE_HAVE_A_2X2 ) { xx = (Fixed)GET_Short() << 2; xy = (Fixed)GET_Short() << 2; yx = (Fixed)GET_Short() << 2; yy = (Fixed)GET_Short() << 2; subglyph2->is_scaled = TRUE; } FORGET_Frame(); subglyph->transform.xx = xx; subglyph->transform.xy = xy; subglyph->transform.yx = yx; subglyph->transform.yy = yy; k = TT_MulFix( xx, yy ) - TT_MulFix( xy, yx ); /* disable hinting in case of scaling/slanting */ if ( ABS( k ) != (1 << 16) ) subglyph2->is_hinted = FALSE; subglyph->file_offset = FILE_Pos(); phase = Load_Glyph; break; /************************************************************/ /* */ /* Load_End state */ /* */ /* after loading a glyph, apply transformation and offset */ /* where necessary, pops element and continue or */ /* stop process. */ /* */ /* exit states : Load_Composite and Load_Exit */ /* */ case Load_End: if ( load_top > 0 ) { subglyph2 = subglyph; load_top--; subglyph = exec->loadStack + load_top; /* check advance width and left side bearing */ if ( !subglyph->preserve_pps && subglyph->element_flag & USE_MY_METRICS ) { subglyph->metrics.horiBearingX = subglyph2->metrics.horiBearingX; subglyph->metrics.horiAdvance = subglyph2->metrics.horiAdvance; subglyph->pp1 = subglyph2->pp1; subglyph->pp2 = subglyph2->pp2; subglyph->preserve_pps = TRUE; } /* apply scale */ if ( subglyph2->is_scaled ) { TT_Vector* cur = subglyph2->zone.cur; TT_Vector* org = subglyph2->zone.org; for ( u = 0; u < num_points; u++ ) { nx = TT_MulFix( cur->x, subglyph->transform.xx ) + TT_MulFix( cur->y, subglyph->transform.yx ); ny = TT_MulFix( cur->x, subglyph->transform.xy ) + TT_MulFix( cur->y, subglyph->transform.yy ); cur->x = nx; cur->y = ny; nx = TT_MulFix( org->x, subglyph->transform.xx ) + TT_MulFix( org->y, subglyph->transform.yx ); ny = TT_MulFix( org->x, subglyph->transform.xy ) + TT_MulFix( org->y, subglyph->transform.yy ); org->x = nx; org->y = ny; cur++; org++; } } /* adjust counts */ for ( k = 0; k < num_contours; k++ ) subglyph2->zone.contours[k] += subglyph->zone.n_points; subglyph->zone.n_points += num_points; subglyph->zone.n_contours += num_contours; left_points -= num_points; left_contours -= num_contours; /* apply offset */ if ( !(subglyph->element_flag & ARGS_ARE_XY_VALUES) ) { u = subglyph->arg1; v = subglyph->arg2; if ( u >= subglyph->zone.n_points || v >= subglyph->zone.n_points ) { error = TT_Err_Invalid_Composite; goto Fail; } x = subglyph->zone.org[v].x - subglyph->zone.org[u].x; y = subglyph->zone.org[v].y - subglyph->zone.org[u].y; } else { x = subglyph->transform.ox; y = subglyph->transform.oy; if ( load_flags & TTLOAD_SCALE_GLYPH ) { x = Scale_X( &exec->metrics, x ); y = Scale_Y( &exec->metrics, y ); if ( subglyph->element_flag & ROUND_XY_TO_GRID ) { x = (x+32) & -64; y = (y+32) & -64; } } } translate_array( num_points, subglyph2->zone.cur, x, y ); cur_to_org( num_points, &subglyph2->zone ); num_points = subglyph->zone.n_points; num_contours = subglyph->zone.n_contours; /* check for last component */ if ( FILE_Seek( subglyph->file_offset ) ) goto Fail_File; if ( subglyph->element_flag & MORE_COMPONENTS ) phase = Load_Composite; else { error = Load_Composite_End( num_points, num_contours, exec, subglyph, stream ); if ( error ) goto Fail; phase = Load_End; } } else phase = Load_Exit; break; case Load_Exit: break; } } /* finally, copy the points arrays to the glyph object */ exec->pts = base_pts; for ( u = 0; u < num_points + 2; u++ ) { glyph->outline.points[u] = exec->pts.cur[u]; glyph->outline.flags [u] = exec->pts.touch[u]; } for ( k = 0; k < num_contours; k++ ) glyph->outline.contours[k] = exec->pts.contours[k]; glyph->outline.n_points = num_points; glyph->outline.n_contours = num_contours; glyph->outline.second_pass = TRUE; /* translate array so that (0,0) is the glyph's origin */ translate_array( num_points + 2, glyph->outline.points, -subglyph->pp1.x, 0 ); TT_Get_Outline_BBox( &glyph->outline, &glyph->metrics.bbox ); if ( subglyph->is_hinted ) { /* grid-fit the bounding box */ glyph->metrics.bbox.xMin &= -64; glyph->metrics.bbox.yMin &= -64; glyph->metrics.bbox.xMax = (glyph->metrics.bbox.xMax+63) & -64; glyph->metrics.bbox.yMax = (glyph->metrics.bbox.yMax+63) & -64; } /* get the device-independent scaled horizontal metrics */ /* take care of fixed-pitch fonts... */ { TT_Pos left_bearing; TT_Pos advance; left_bearing = subglyph->metrics.horiBearingX; advance = subglyph->metrics.horiAdvance; if ( face->postscript.isFixedPitch ) advance = face->horizontalHeader.advance_Width_Max; if ( load_flags & TTLOAD_SCALE_GLYPH ) { left_bearing = Scale_X( &exec->metrics, left_bearing ); advance = Scale_X( &exec->metrics, advance ); } glyph->metrics.linearHoriBearingX = left_bearing; glyph->metrics.linearHoriAdvance = advance; } glyph->metrics.horiBearingX = glyph->metrics.bbox.xMin; glyph->metrics.horiBearingY = glyph->metrics.bbox.yMax; glyph->metrics.horiAdvance = subglyph->pp2.x - subglyph->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"... */ { Short top_bearing; /* vertical top side bearing (EM units) */ UShort advance_height; /* vertical advance height (EM units) */ TT_Pos left; /* scaled vertical left side bearing */ TT_Pos top; /* scaled vertical top side bearing */ TT_Pos advance; /* scaled vertical advance height */ /* Get the unscaled "tsb" and "ah" */ if ( face->verticalInfo && face->verticalHeader.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_Horizontal_Header*)&face->verticalHeader, 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... */ /* */ /* NOTE2: The sTypoDescender is negative, which is why */ /* we compute the baseline-to-baseline distance */ /* here with : */ /* ascender - descender + linegap */ /* */ top_bearing = (Short) (face->os2.sTypoLineGap/2); advance_height = (UShort)(face->os2.sTypoAscender - face->os2.sTypoDescender + face->os2.sTypoLineGap); } /* scale the metrics */ if (load_flags & TTLOAD_SCALE_GLYPH) { top = Scale_Y( &exec->metrics, top_bearing ); advance = Scale_Y( &exec->metrics, advance_height ); } else { top = top_bearing; advance = advance_height; } glyph->metrics.linearVertBearingY = top; glyph->metrics.linearVertAdvance = advance; /* XXX : for now, we have no better algo for the lsb, but it should */ /* work ok.. */ /* */ left = (glyph->metrics.bbox.xMin - glyph->metrics.bbox.xMax)/2; /* grid-fit them if necessary */ if ( subglyph->is_hinted ) { 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 ( !exec->face->postscript.isFixedPitch && instance && subglyph->is_hinted ) { widths = Get_Advance_Widths( exec->face, exec->instance->metrics.x_ppem ); if ( widths ) glyph->metrics.horiAdvance = widths[glyph_index] << 6; } glyph->outline.dropout_mode = (Char)exec->GS.scan_type; error = TT_Err_Ok; Fail_File: Fail: DONE_Stream( stream ); Fin: /* reset the execution context */ exec->pts = base_pts; if ( !instance || !instance->debug ) Done_Context( exec ); return error; } /* END */