Edit
kc3-lang/freetype/src/base/ftoutln.c
Werner Lemberg
- src/base/ftoutln.c
-
/***************************************************************************/ /* */ /* ftoutln.c */ /* */ /* FreeType outline management (body). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010 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. */ /* */ /***************************************************************************/ /*************************************************************************/ /* */ /* All functions are declared in freetype.h. */ /* */ /*************************************************************************/ #include <ft2build.h> #include FT_OUTLINE_H #include FT_INTERNAL_OBJECTS_H #include FT_INTERNAL_DEBUG_H #include FT_TRIGONOMETRY_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_outline static const FT_Outline null_outline = { 0, 0, 0, 0, 0, 0 }; /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_Decompose( FT_Outline* outline, const FT_Outline_Funcs* func_interface, void* user ) { #undef SCALED #define SCALED( x ) ( ( (x) << shift ) - delta ) FT_Vector v_last; FT_Vector v_control; FT_Vector v_start; FT_Vector* point; FT_Vector* limit; char* tags; FT_Error error; FT_Int n; /* index of contour in outline */ FT_UInt first; /* index of first point in contour */ FT_Int tag; /* current point's state */ FT_Int shift; FT_Pos delta; if ( !outline || !func_interface ) return FT_Err_Invalid_Argument; shift = func_interface->shift; delta = func_interface->delta; first = 0; for ( n = 0; n < outline->n_contours; n++ ) { FT_Int last; /* index of last point in contour */ FT_TRACE5(( "FT_Outline_Decompose: Outline %d\n", n )); last = outline->contours[n]; if ( last < 0 ) goto Invalid_Outline; limit = outline->points + last; v_start = outline->points[first]; v_start.x = SCALED( v_start.x ); v_start.y = SCALED( v_start.y ); v_last = outline->points[last]; v_last.x = SCALED( v_last.x ); v_last.y = SCALED( v_last.y ); v_control = v_start; point = outline->points + first; tags = outline->tags + first; tag = FT_CURVE_TAG( tags[0] ); /* A contour cannot start with a cubic control point! */ if ( tag == FT_CURVE_TAG_CUBIC ) goto Invalid_Outline; /* check first point to determine origin */ if ( tag == FT_CURVE_TAG_CONIC ) { /* first point is conic control. Yes, this happens. */ if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON ) { /* start at last point if it is on the curve */ v_start = v_last; limit--; } else { /* if both first and last points are conic, */ /* start at their middle and record its position */ /* for closure */ v_start.x = ( v_start.x + v_last.x ) / 2; v_start.y = ( v_start.y + v_last.y ) / 2; v_last = v_start; } point--; tags--; } FT_TRACE5(( " move to (%.2f, %.2f)\n", v_start.x / 64.0, v_start.y / 64.0 )); error = func_interface->move_to( &v_start, user ); if ( error ) goto Exit; while ( point < limit ) { point++; tags++; tag = FT_CURVE_TAG( tags[0] ); switch ( tag ) { case FT_CURVE_TAG_ON: /* emit a single line_to */ { FT_Vector vec; vec.x = SCALED( point->x ); vec.y = SCALED( point->y ); FT_TRACE5(( " line to (%.2f, %.2f)\n", vec.x / 64.0, vec.y / 64.0 )); error = func_interface->line_to( &vec, user ); if ( error ) goto Exit; continue; } case FT_CURVE_TAG_CONIC: /* consume conic arcs */ v_control.x = SCALED( point->x ); v_control.y = SCALED( point->y ); Do_Conic: if ( point < limit ) { FT_Vector vec; FT_Vector v_middle; point++; tags++; tag = FT_CURVE_TAG( tags[0] ); vec.x = SCALED( point->x ); vec.y = SCALED( point->y ); if ( tag == FT_CURVE_TAG_ON ) { FT_TRACE5(( " conic to (%.2f, %.2f)" " with control (%.2f, %.2f)\n", vec.x / 64.0, vec.y / 64.0, v_control.x / 64.0, v_control.y / 64.0 )); error = func_interface->conic_to( &v_control, &vec, user ); if ( error ) goto Exit; continue; } if ( tag != FT_CURVE_TAG_CONIC ) goto Invalid_Outline; v_middle.x = ( v_control.x + vec.x ) / 2; v_middle.y = ( v_control.y + vec.y ) / 2; FT_TRACE5(( " conic to (%.2f, %.2f)" " with control (%.2f, %.2f)\n", v_middle.x / 64.0, v_middle.y / 64.0, v_control.x / 64.0, v_control.y / 64.0 )); error = func_interface->conic_to( &v_control, &v_middle, user ); if ( error ) goto Exit; v_control = vec; goto Do_Conic; } FT_TRACE5(( " conic to (%.2f, %.2f)" " with control (%.2f, %.2f)\n", v_start.x / 64.0, v_start.y / 64.0, v_control.x / 64.0, v_control.y / 64.0 )); error = func_interface->conic_to( &v_control, &v_start, user ); goto Close; default: /* FT_CURVE_TAG_CUBIC */ { FT_Vector vec1, vec2; if ( point + 1 > limit || FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC ) goto Invalid_Outline; point += 2; tags += 2; vec1.x = SCALED( point[-2].x ); vec1.y = SCALED( point[-2].y ); vec2.x = SCALED( point[-1].x ); vec2.y = SCALED( point[-1].y ); if ( point <= limit ) { FT_Vector vec; vec.x = SCALED( point->x ); vec.y = SCALED( point->y ); FT_TRACE5(( " cubic to (%.2f, %.2f)" " with controls (%.2f, %.2f) and (%.2f, %.2f)\n", vec.x / 64.0, vec.y / 64.0, vec1.x / 64.0, vec1.y / 64.0, vec2.x / 64.0, vec2.y / 64.0 )); error = func_interface->cubic_to( &vec1, &vec2, &vec, user ); if ( error ) goto Exit; continue; } FT_TRACE5(( " cubic to (%.2f, %.2f)" " with controls (%.2f, %.2f) and (%.2f, %.2f)\n", v_start.x / 64.0, v_start.y / 64.0, vec1.x / 64.0, vec1.y / 64.0, vec2.x / 64.0, vec2.y / 64.0 )); error = func_interface->cubic_to( &vec1, &vec2, &v_start, user ); goto Close; } } } /* close the contour with a line segment */ FT_TRACE5(( " line to (%.2f, %.2f)\n", v_start.x / 64.0, v_start.y / 64.0 )); error = func_interface->line_to( &v_start, user ); Close: if ( error ) goto Exit; first = last + 1; } FT_TRACE5(( "FT_Outline_Decompose: Done\n", n )); return FT_Err_Ok; Exit: FT_TRACE5(( "FT_Outline_Decompose: Error %d\n", error )); return error; Invalid_Outline: return FT_Err_Invalid_Outline; } FT_EXPORT_DEF( FT_Error ) FT_Outline_New_Internal( FT_Memory memory, FT_UInt numPoints, FT_Int numContours, FT_Outline *anoutline ) { FT_Error error; if ( !anoutline || !memory ) return FT_Err_Invalid_Argument; *anoutline = null_outline; if ( FT_NEW_ARRAY( anoutline->points, numPoints ) || FT_NEW_ARRAY( anoutline->tags, numPoints ) || FT_NEW_ARRAY( anoutline->contours, numContours ) ) goto Fail; anoutline->n_points = (FT_UShort)numPoints; anoutline->n_contours = (FT_Short)numContours; anoutline->flags |= FT_OUTLINE_OWNER; return FT_Err_Ok; Fail: anoutline->flags |= FT_OUTLINE_OWNER; FT_Outline_Done_Internal( memory, anoutline ); return error; } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_New( FT_Library library, FT_UInt numPoints, FT_Int numContours, FT_Outline *anoutline ) { if ( !library ) return FT_Err_Invalid_Library_Handle; return FT_Outline_New_Internal( library->memory, numPoints, numContours, anoutline ); } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_Check( FT_Outline* outline ) { if ( outline ) { FT_Int n_points = outline->n_points; FT_Int n_contours = outline->n_contours; FT_Int end0, end; FT_Int n; /* empty glyph? */ if ( n_points == 0 && n_contours == 0 ) return 0; /* check point and contour counts */ if ( n_points <= 0 || n_contours <= 0 ) goto Bad; end0 = end = -1; for ( n = 0; n < n_contours; n++ ) { end = outline->contours[n]; /* note that we don't accept empty contours */ if ( end <= end0 || end >= n_points ) goto Bad; end0 = end; } if ( end != n_points - 1 ) goto Bad; /* XXX: check the tags array */ return 0; } Bad: return FT_Err_Invalid_Argument; } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_Copy( const FT_Outline* source, FT_Outline *target ) { FT_Int is_owner; if ( !source || !target || source->n_points != target->n_points || source->n_contours != target->n_contours ) return FT_Err_Invalid_Argument; if ( source == target ) return FT_Err_Ok; FT_ARRAY_COPY( target->points, source->points, source->n_points ); FT_ARRAY_COPY( target->tags, source->tags, source->n_points ); FT_ARRAY_COPY( target->contours, source->contours, source->n_contours ); /* copy all flags, except the `FT_OUTLINE_OWNER' one */ is_owner = target->flags & FT_OUTLINE_OWNER; target->flags = source->flags; target->flags &= ~FT_OUTLINE_OWNER; target->flags |= is_owner; return FT_Err_Ok; } FT_EXPORT_DEF( FT_Error ) FT_Outline_Done_Internal( FT_Memory memory, FT_Outline* outline ) { if ( memory && outline ) { if ( outline->flags & FT_OUTLINE_OWNER ) { FT_FREE( outline->points ); FT_FREE( outline->tags ); FT_FREE( outline->contours ); } *outline = null_outline; return FT_Err_Ok; } else return FT_Err_Invalid_Argument; } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_Done( FT_Library library, FT_Outline* outline ) { /* check for valid `outline' in FT_Outline_Done_Internal() */ if ( !library ) return FT_Err_Invalid_Library_Handle; return FT_Outline_Done_Internal( library->memory, outline ); } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( void ) FT_Outline_Get_CBox( const FT_Outline* outline, FT_BBox *acbox ) { FT_Pos xMin, yMin, xMax, yMax; if ( outline && acbox ) { if ( outline->n_points == 0 ) { xMin = 0; yMin = 0; xMax = 0; yMax = 0; } else { FT_Vector* vec = outline->points; FT_Vector* limit = vec + outline->n_points; xMin = xMax = vec->x; yMin = yMax = vec->y; vec++; for ( ; vec < limit; vec++ ) { FT_Pos x, y; x = vec->x; if ( x < xMin ) xMin = x; if ( x > xMax ) xMax = x; y = vec->y; if ( y < yMin ) yMin = y; if ( y > yMax ) yMax = y; } } acbox->xMin = xMin; acbox->xMax = xMax; acbox->yMin = yMin; acbox->yMax = yMax; } } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( void ) FT_Outline_Translate( const FT_Outline* outline, FT_Pos xOffset, FT_Pos yOffset ) { FT_UShort n; FT_Vector* vec; if ( !outline ) return; vec = outline->points; for ( n = 0; n < outline->n_points; n++ ) { vec->x += xOffset; vec->y += yOffset; vec++; } } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( void ) FT_Outline_Reverse( FT_Outline* outline ) { FT_UShort n; FT_Int first, last; if ( !outline ) return; first = 0; for ( n = 0; n < outline->n_contours; n++ ) { last = outline->contours[n]; /* reverse point table */ { FT_Vector* p = outline->points + first; FT_Vector* q = outline->points + last; FT_Vector swap; while ( p < q ) { swap = *p; *p = *q; *q = swap; p++; q--; } } /* reverse tags table */ { char* p = outline->tags + first; char* q = outline->tags + last; char swap; while ( p < q ) { swap = *p; *p = *q; *q = swap; p++; q--; } } first = last + 1; } outline->flags ^= FT_OUTLINE_REVERSE_FILL; } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_Render( FT_Library library, FT_Outline* outline, FT_Raster_Params* params ) { FT_Error error; FT_Bool update = FALSE; FT_Renderer renderer; FT_ListNode node; if ( !library ) return FT_Err_Invalid_Library_Handle; if ( !outline || !params ) return FT_Err_Invalid_Argument; renderer = library->cur_renderer; node = library->renderers.head; params->source = (void*)outline; error = FT_Err_Cannot_Render_Glyph; while ( renderer ) { error = renderer->raster_render( renderer->raster, params ); if ( !error || FT_ERROR_BASE( error ) != FT_Err_Cannot_Render_Glyph ) break; /* FT_Err_Cannot_Render_Glyph is returned if the render mode */ /* is unsupported by the current renderer for this glyph image */ /* format */ /* now, look for another renderer that supports the same */ /* format */ renderer = FT_Lookup_Renderer( library, FT_GLYPH_FORMAT_OUTLINE, &node ); update = TRUE; } /* if we changed the current renderer for the glyph image format */ /* we need to select it as the next current one */ if ( !error && update && renderer ) FT_Set_Renderer( library, renderer, 0, 0 ); return error; } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_Get_Bitmap( FT_Library library, FT_Outline* outline, const FT_Bitmap *abitmap ) { FT_Raster_Params params; if ( !abitmap ) return FT_Err_Invalid_Argument; /* other checks are delayed to FT_Outline_Render() */ params.target = abitmap; params.flags = 0; if ( abitmap->pixel_mode == FT_PIXEL_MODE_GRAY || abitmap->pixel_mode == FT_PIXEL_MODE_LCD || abitmap->pixel_mode == FT_PIXEL_MODE_LCD_V ) params.flags |= FT_RASTER_FLAG_AA; return FT_Outline_Render( library, outline, ¶ms ); } /* documentation is in freetype.h */ FT_EXPORT_DEF( void ) FT_Vector_Transform( FT_Vector* vector, const FT_Matrix* matrix ) { FT_Pos xz, yz; if ( !vector || !matrix ) return; xz = FT_MulFix( vector->x, matrix->xx ) + FT_MulFix( vector->y, matrix->xy ); yz = FT_MulFix( vector->x, matrix->yx ) + FT_MulFix( vector->y, matrix->yy ); vector->x = xz; vector->y = yz; } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( void ) FT_Outline_Transform( const FT_Outline* outline, const FT_Matrix* matrix ) { FT_Vector* vec; FT_Vector* limit; if ( !outline || !matrix ) return; vec = outline->points; limit = vec + outline->n_points; for ( ; vec < limit; vec++ ) FT_Vector_Transform( vec, matrix ); } #if 0 #define FT_OUTLINE_GET_CONTOUR( outline, c, first, last ) \ do { \ (first) = ( c > 0 ) ? (outline)->points + \ (outline)->contours[c - 1] + 1 \ : (outline)->points; \ (last) = (outline)->points + (outline)->contours[c]; \ } while ( 0 ) /* Is a point in some contour? */ /* */ /* We treat every point of the contour as if it */ /* it were ON. That is, we allow false positives, */ /* but disallow false negatives. (XXX really?) */ static FT_Bool ft_contour_has( FT_Outline* outline, FT_Short c, FT_Vector* point ) { FT_Vector* first; FT_Vector* last; FT_Vector* a; FT_Vector* b; FT_UInt n = 0; FT_OUTLINE_GET_CONTOUR( outline, c, first, last ); for ( a = first; a <= last; a++ ) { FT_Pos x; FT_Int intersect; b = ( a == last ) ? first : a + 1; intersect = ( a->y - point->y ) ^ ( b->y - point->y ); /* a and b are on the same side */ if ( intersect >= 0 ) { if ( intersect == 0 && a->y == point->y ) { if ( ( a->x <= point->x && b->x >= point->x ) || ( a->x >= point->x && b->x <= point->x ) ) return 1; } continue; } x = a->x + ( b->x - a->x ) * (point->y - a->y ) / ( b->y - a->y ); if ( x < point->x ) n++; else if ( x == point->x ) return 1; } return ( n % 2 ); } static FT_Bool ft_contour_enclosed( FT_Outline* outline, FT_UShort c ) { FT_Vector* first; FT_Vector* last; FT_Short i; FT_OUTLINE_GET_CONTOUR( outline, c, first, last ); for ( i = 0; i < outline->n_contours; i++ ) { if ( i != c && ft_contour_has( outline, i, first ) ) { FT_Vector* pt; for ( pt = first + 1; pt <= last; pt++ ) if ( !ft_contour_has( outline, i, pt ) ) return 0; return 1; } } return 0; } /* This version differs from the public one in that each */ /* part (contour not enclosed in another contour) of the */ /* outline is checked for orientation. This is */ /* necessary for some buggy CJK fonts. */ static FT_Orientation ft_outline_get_orientation( FT_Outline* outline ) { FT_Short i; FT_Vector* first; FT_Vector* last; FT_Orientation orient = FT_ORIENTATION_NONE; first = outline->points; for ( i = 0; i < outline->n_contours; i++, first = last + 1 ) { FT_Vector* point; FT_Vector* xmin_point; FT_Pos xmin; last = outline->points + outline->contours[i]; /* skip degenerate contours */ if ( last < first + 2 ) continue; if ( ft_contour_enclosed( outline, i ) ) continue; xmin = first->x; xmin_point = first; for ( point = first + 1; point <= last; point++ ) { if ( point->x < xmin ) { xmin = point->x; xmin_point = point; } } /* check the orientation of the contour */ { FT_Vector* prev; FT_Vector* next; FT_Orientation o; prev = ( xmin_point == first ) ? last : xmin_point - 1; next = ( xmin_point == last ) ? first : xmin_point + 1; if ( FT_Atan2( prev->x - xmin_point->x, prev->y - xmin_point->y ) > FT_Atan2( next->x - xmin_point->x, next->y - xmin_point->y ) ) o = FT_ORIENTATION_POSTSCRIPT; else o = FT_ORIENTATION_TRUETYPE; if ( orient == FT_ORIENTATION_NONE ) orient = o; else if ( orient != o ) return FT_ORIENTATION_NONE; } } return orient; } #endif /* 0 */ /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Error ) FT_Outline_Embolden( FT_Outline* outline, FT_Pos strength ) { FT_Vector* points; FT_Vector v_prev, v_first, v_next, v_cur; FT_Angle rotate, angle_in, angle_out; FT_Int c, n, first; FT_Int orientation; if ( !outline ) return FT_Err_Invalid_Argument; strength /= 2; if ( strength == 0 ) return FT_Err_Ok; orientation = FT_Outline_Get_Orientation( outline ); if ( orientation == FT_ORIENTATION_NONE ) { if ( outline->n_contours ) return FT_Err_Invalid_Argument; else return FT_Err_Ok; } if ( orientation == FT_ORIENTATION_TRUETYPE ) rotate = -FT_ANGLE_PI2; else rotate = FT_ANGLE_PI2; points = outline->points; first = 0; for ( c = 0; c < outline->n_contours; c++ ) { int last = outline->contours[c]; v_first = points[first]; v_prev = points[last]; v_cur = v_first; for ( n = first; n <= last; n++ ) { FT_Vector in, out; FT_Angle angle_diff; FT_Pos d; FT_Fixed scale; if ( n < last ) v_next = points[n + 1]; else v_next = v_first; /* compute the in and out vectors */ in.x = v_cur.x - v_prev.x; in.y = v_cur.y - v_prev.y; out.x = v_next.x - v_cur.x; out.y = v_next.y - v_cur.y; angle_in = FT_Atan2( in.x, in.y ); angle_out = FT_Atan2( out.x, out.y ); angle_diff = FT_Angle_Diff( angle_in, angle_out ); scale = FT_Cos( angle_diff / 2 ); if ( scale < 0x4000L && scale > -0x4000L ) in.x = in.y = 0; else { d = FT_DivFix( strength, scale ); FT_Vector_From_Polar( &in, d, angle_in + angle_diff / 2 - rotate ); } outline->points[n].x = v_cur.x + strength + in.x; outline->points[n].y = v_cur.y + strength + in.y; v_prev = v_cur; v_cur = v_next; } first = last + 1; } return FT_Err_Ok; } /* documentation is in ftoutln.h */ FT_EXPORT_DEF( FT_Orientation ) FT_Outline_Get_Orientation( FT_Outline* outline ) { FT_Pos xmin = 32768L; FT_Pos xmin_ymin = 32768L; FT_Pos xmin_ymax = -32768L; FT_Vector* xmin_first = NULL; FT_Vector* xmin_last = NULL; short* contour; FT_Vector* first; FT_Vector* last; FT_Vector* prev; FT_Vector* point; int i; FT_Pos ray_y[3]; FT_Orientation result[3] = { FT_ORIENTATION_NONE, FT_ORIENTATION_NONE, FT_ORIENTATION_NONE }; if ( !outline || outline->n_points <= 0 ) return FT_ORIENTATION_TRUETYPE; /* We use the nonzero winding rule to find the orientation. */ /* Since glyph outlines behave much more `regular' than arbitrary */ /* cubic or quadratic curves, this test deals with the polygon */ /* only which is spanned up by the control points. */ first = outline->points; for ( contour = outline->contours; contour < outline->contours + outline->n_contours; contour++, first = last + 1 ) { FT_Pos contour_xmin = 32768L; FT_Pos contour_xmax = -32768L; FT_Pos contour_ymin = 32768L; FT_Pos contour_ymax = -32768L; last = outline->points + *contour; /* skip degenerate contours */ if ( last < first + 2 ) continue; for ( point = first; point <= last; ++point ) { if ( point->x < contour_xmin ) contour_xmin = point->x; if ( point->x > contour_xmax ) contour_xmax = point->x; if ( point->y < contour_ymin ) contour_ymin = point->y; if ( point->y > contour_ymax ) contour_ymax = point->y; } if ( contour_xmin < xmin && contour_xmin != contour_xmax && contour_ymin != contour_ymax ) { xmin = contour_xmin; xmin_ymin = contour_ymin; xmin_ymax = contour_ymax; xmin_first = first; xmin_last = last; } } if ( xmin == 32768L ) return FT_ORIENTATION_TRUETYPE; ray_y[0] = ( xmin_ymin * 3 + xmin_ymax ) >> 2; ray_y[1] = ( xmin_ymin + xmin_ymax ) >> 1; ray_y[2] = ( xmin_ymin + xmin_ymax * 3 ) >> 2; for ( i = 0; i < 3; i++ ) { FT_Pos left_x; FT_Pos right_x; FT_Vector* left1; FT_Vector* left2; FT_Vector* right1; FT_Vector* right2; RedoRay: left_x = 32768L; right_x = -32768L; left1 = left2 = right1 = right2 = NULL; prev = xmin_last; for ( point = xmin_first; point <= xmin_last; prev = point, ++point ) { FT_Pos tmp_x; if ( point->y == ray_y[i] || prev->y == ray_y[i] ) { ray_y[i]++; goto RedoRay; } if ( ( point->y < ray_y[i] && prev->y < ray_y[i] ) || ( point->y > ray_y[i] && prev->y > ray_y[i] ) ) continue; tmp_x = FT_MulDiv( point->x - prev->x, ray_y[i] - prev->y, point->y - prev->y ) + prev->x; if ( tmp_x < left_x ) { left_x = tmp_x; left1 = prev; left2 = point; } if ( tmp_x > right_x ) { right_x = tmp_x; right1 = prev; right2 = point; } } if ( left1 && right1 ) { if ( left1->y < left2->y && right1->y > right2->y ) result[i] = FT_ORIENTATION_TRUETYPE; else if ( left1->y > left2->y && right1->y < right2->y ) result[i] = FT_ORIENTATION_POSTSCRIPT; else result[i] = FT_ORIENTATION_NONE; } } if ( result[0] != FT_ORIENTATION_NONE && ( result[0] == result[1] || result[0] == result[2] ) ) return result[0]; if ( result[1] != FT_ORIENTATION_NONE && result[1] == result[2] ) return result[1]; return FT_ORIENTATION_TRUETYPE; } /* END */