| /***************************************************************************/ |
| /* */ |
| /* ftstroke.c */ |
| /* */ |
| /* FreeType path stroker (body). */ |
| /* */ |
| /* Copyright 2002-2015 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_STROKER_H |
| #include FT_TRIGONOMETRY_H |
| #include FT_OUTLINE_H |
| #include FT_INTERNAL_MEMORY_H |
| #include FT_INTERNAL_DEBUG_H |
| #include FT_INTERNAL_OBJECTS_H |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_StrokerBorder ) |
| FT_Outline_GetInsideBorder( FT_Outline* outline ) |
| { |
| FT_Orientation o = FT_Outline_Get_Orientation( outline ); |
| |
| |
| return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_RIGHT |
| : FT_STROKER_BORDER_LEFT; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_StrokerBorder ) |
| FT_Outline_GetOutsideBorder( FT_Outline* outline ) |
| { |
| FT_Orientation o = FT_Outline_Get_Orientation( outline ); |
| |
| |
| return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_LEFT |
| : FT_STROKER_BORDER_RIGHT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** BEZIER COMPUTATIONS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| #define FT_SMALL_CONIC_THRESHOLD ( FT_ANGLE_PI / 6 ) |
| #define FT_SMALL_CUBIC_THRESHOLD ( FT_ANGLE_PI / 8 ) |
| |
| #define FT_EPSILON 2 |
| |
| #define FT_IS_SMALL( x ) ( (x) > -FT_EPSILON && (x) < FT_EPSILON ) |
| |
| |
| static FT_Pos |
| ft_pos_abs( FT_Pos x ) |
| { |
| return x >= 0 ? x : -x; |
| } |
| |
| |
| static void |
| ft_conic_split( FT_Vector* base ) |
| { |
| FT_Pos a, b; |
| |
| |
| base[4].x = base[2].x; |
| b = base[1].x; |
| a = base[3].x = ( base[2].x + b ) / 2; |
| b = base[1].x = ( base[0].x + b ) / 2; |
| base[2].x = ( a + b ) / 2; |
| |
| base[4].y = base[2].y; |
| b = base[1].y; |
| a = base[3].y = ( base[2].y + b ) / 2; |
| b = base[1].y = ( base[0].y + b ) / 2; |
| base[2].y = ( a + b ) / 2; |
| } |
| |
| |
| static FT_Bool |
| ft_conic_is_small_enough( FT_Vector* base, |
| FT_Angle *angle_in, |
| FT_Angle *angle_out ) |
| { |
| FT_Vector d1, d2; |
| FT_Angle theta; |
| FT_Int close1, close2; |
| |
| |
| d1.x = base[1].x - base[2].x; |
| d1.y = base[1].y - base[2].y; |
| d2.x = base[0].x - base[1].x; |
| d2.y = base[0].y - base[1].y; |
| |
| close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y ); |
| close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y ); |
| |
| if ( close1 ) |
| { |
| if ( close2 ) |
| { |
| /* basically a point; */ |
| /* do nothing to retain original direction */ |
| } |
| else |
| { |
| *angle_in = |
| *angle_out = FT_Atan2( d2.x, d2.y ); |
| } |
| } |
| else /* !close1 */ |
| { |
| if ( close2 ) |
| { |
| *angle_in = |
| *angle_out = FT_Atan2( d1.x, d1.y ); |
| } |
| else |
| { |
| *angle_in = FT_Atan2( d1.x, d1.y ); |
| *angle_out = FT_Atan2( d2.x, d2.y ); |
| } |
| } |
| |
| theta = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_out ) ); |
| |
| return FT_BOOL( theta < FT_SMALL_CONIC_THRESHOLD ); |
| } |
| |
| |
| static void |
| ft_cubic_split( FT_Vector* base ) |
| { |
| FT_Pos a, b, c, d; |
| |
| |
| base[6].x = base[3].x; |
| c = base[1].x; |
| d = base[2].x; |
| base[1].x = a = ( base[0].x + c ) / 2; |
| base[5].x = b = ( base[3].x + d ) / 2; |
| c = ( c + d ) / 2; |
| base[2].x = a = ( a + c ) / 2; |
| base[4].x = b = ( b + c ) / 2; |
| base[3].x = ( a + b ) / 2; |
| |
| base[6].y = base[3].y; |
| c = base[1].y; |
| d = base[2].y; |
| base[1].y = a = ( base[0].y + c ) / 2; |
| base[5].y = b = ( base[3].y + d ) / 2; |
| c = ( c + d ) / 2; |
| base[2].y = a = ( a + c ) / 2; |
| base[4].y = b = ( b + c ) / 2; |
| base[3].y = ( a + b ) / 2; |
| } |
| |
| |
| /* Return the average of `angle1' and `angle2'. */ |
| /* This gives correct result even if `angle1' and `angle2' */ |
| /* have opposite signs. */ |
| static FT_Angle |
| ft_angle_mean( FT_Angle angle1, |
| FT_Angle angle2 ) |
| { |
| return angle1 + FT_Angle_Diff( angle1, angle2 ) / 2; |
| } |
| |
| |
| static FT_Bool |
| ft_cubic_is_small_enough( FT_Vector* base, |
| FT_Angle *angle_in, |
| FT_Angle *angle_mid, |
| FT_Angle *angle_out ) |
| { |
| FT_Vector d1, d2, d3; |
| FT_Angle theta1, theta2; |
| FT_Int close1, close2, close3; |
| |
| |
| d1.x = base[2].x - base[3].x; |
| d1.y = base[2].y - base[3].y; |
| d2.x = base[1].x - base[2].x; |
| d2.y = base[1].y - base[2].y; |
| d3.x = base[0].x - base[1].x; |
| d3.y = base[0].y - base[1].y; |
| |
| close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y ); |
| close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y ); |
| close3 = FT_IS_SMALL( d3.x ) && FT_IS_SMALL( d3.y ); |
| |
| if ( close1 ) |
| { |
| if ( close2 ) |
| { |
| if ( close3 ) |
| { |
| /* basically a point; */ |
| /* do nothing to retain original direction */ |
| } |
| else /* !close3 */ |
| { |
| *angle_in = |
| *angle_mid = |
| *angle_out = FT_Atan2( d3.x, d3.y ); |
| } |
| } |
| else /* !close2 */ |
| { |
| if ( close3 ) |
| { |
| *angle_in = |
| *angle_mid = |
| *angle_out = FT_Atan2( d2.x, d2.y ); |
| } |
| else /* !close3 */ |
| { |
| *angle_in = |
| *angle_mid = FT_Atan2( d2.x, d2.y ); |
| *angle_out = FT_Atan2( d3.x, d3.y ); |
| } |
| } |
| } |
| else /* !close1 */ |
| { |
| if ( close2 ) |
| { |
| if ( close3 ) |
| { |
| *angle_in = |
| *angle_mid = |
| *angle_out = FT_Atan2( d1.x, d1.y ); |
| } |
| else /* !close3 */ |
| { |
| *angle_in = FT_Atan2( d1.x, d1.y ); |
| *angle_out = FT_Atan2( d3.x, d3.y ); |
| *angle_mid = ft_angle_mean( *angle_in, *angle_out ); |
| } |
| } |
| else /* !close2 */ |
| { |
| if ( close3 ) |
| { |
| *angle_in = FT_Atan2( d1.x, d1.y ); |
| *angle_mid = |
| *angle_out = FT_Atan2( d2.x, d2.y ); |
| } |
| else /* !close3 */ |
| { |
| *angle_in = FT_Atan2( d1.x, d1.y ); |
| *angle_mid = FT_Atan2( d2.x, d2.y ); |
| *angle_out = FT_Atan2( d3.x, d3.y ); |
| } |
| } |
| } |
| |
| theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) ); |
| theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) ); |
| |
| return FT_BOOL( theta1 < FT_SMALL_CUBIC_THRESHOLD && |
| theta2 < FT_SMALL_CUBIC_THRESHOLD ); |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** STROKE BORDERS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| typedef enum FT_StrokeTags_ |
| { |
| FT_STROKE_TAG_ON = 1, /* on-curve point */ |
| FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */ |
| FT_STROKE_TAG_BEGIN = 4, /* sub-path start */ |
| FT_STROKE_TAG_END = 8 /* sub-path end */ |
| |
| } FT_StrokeTags; |
| |
| #define FT_STROKE_TAG_BEGIN_END ( FT_STROKE_TAG_BEGIN | FT_STROKE_TAG_END ) |
| |
| typedef struct FT_StrokeBorderRec_ |
| { |
| FT_UInt num_points; |
| FT_UInt max_points; |
| FT_Vector* points; |
| FT_Byte* tags; |
| FT_Bool movable; /* TRUE for ends of lineto borders */ |
| FT_Int start; /* index of current sub-path start point */ |
| FT_Memory memory; |
| FT_Bool valid; |
| |
| } FT_StrokeBorderRec, *FT_StrokeBorder; |
| |
| |
| static FT_Error |
| ft_stroke_border_grow( FT_StrokeBorder border, |
| FT_UInt new_points ) |
| { |
| FT_UInt old_max = border->max_points; |
| FT_UInt new_max = border->num_points + new_points; |
| FT_Error error = FT_Err_Ok; |
| |
| |
| if ( new_max > old_max ) |
| { |
| FT_UInt cur_max = old_max; |
| FT_Memory memory = border->memory; |
| |
| |
| while ( cur_max < new_max ) |
| cur_max += ( cur_max >> 1 ) + 16; |
| |
| if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) || |
| FT_RENEW_ARRAY( border->tags, old_max, cur_max ) ) |
| goto Exit; |
| |
| border->max_points = cur_max; |
| } |
| |
| Exit: |
| return error; |
| } |
| |
| |
| static void |
| ft_stroke_border_close( FT_StrokeBorder border, |
| FT_Bool reverse ) |
| { |
| FT_UInt start = (FT_UInt)border->start; |
| FT_UInt count = border->num_points; |
| |
| |
| FT_ASSERT( border->start >= 0 ); |
| |
| /* don't record empty paths! */ |
| if ( count <= start + 1U ) |
| border->num_points = start; |
| else |
| { |
| /* copy the last point to the start of this sub-path, since */ |
| /* it contains the `adjusted' starting coordinates */ |
| border->num_points = --count; |
| border->points[start] = border->points[count]; |
| |
| if ( reverse ) |
| { |
| /* reverse the points */ |
| { |
| FT_Vector* vec1 = border->points + start + 1; |
| FT_Vector* vec2 = border->points + count - 1; |
| |
| |
| for ( ; vec1 < vec2; vec1++, vec2-- ) |
| { |
| FT_Vector tmp; |
| |
| |
| tmp = *vec1; |
| *vec1 = *vec2; |
| *vec2 = tmp; |
| } |
| } |
| |
| /* then the tags */ |
| { |
| FT_Byte* tag1 = border->tags + start + 1; |
| FT_Byte* tag2 = border->tags + count - 1; |
| |
| |
| for ( ; tag1 < tag2; tag1++, tag2-- ) |
| { |
| FT_Byte tmp; |
| |
| |
| tmp = *tag1; |
| *tag1 = *tag2; |
| *tag2 = tmp; |
| } |
| } |
| } |
| |
| border->tags[start ] |= FT_STROKE_TAG_BEGIN; |
| border->tags[count - 1] |= FT_STROKE_TAG_END; |
| } |
| |
| border->start = -1; |
| border->movable = FALSE; |
| } |
| |
| |
| static FT_Error |
| ft_stroke_border_lineto( FT_StrokeBorder border, |
| FT_Vector* to, |
| FT_Bool movable ) |
| { |
| FT_Error error = FT_Err_Ok; |
| |
| |
| FT_ASSERT( border->start >= 0 ); |
| |
| if ( border->movable ) |
| { |
| /* move last point */ |
| border->points[border->num_points - 1] = *to; |
| } |
| else |
| { |
| /* don't add zero-length lineto */ |
| if ( border->num_points > 0 && |
| FT_IS_SMALL( border->points[border->num_points - 1].x - to->x ) && |
| FT_IS_SMALL( border->points[border->num_points - 1].y - to->y ) ) |
| return error; |
| |
| /* add one point */ |
| error = ft_stroke_border_grow( border, 1 ); |
| if ( !error ) |
| { |
| FT_Vector* vec = border->points + border->num_points; |
| FT_Byte* tag = border->tags + border->num_points; |
| |
| |
| vec[0] = *to; |
| tag[0] = FT_STROKE_TAG_ON; |
| |
| border->num_points += 1; |
| } |
| } |
| border->movable = movable; |
| return error; |
| } |
| |
| |
| static FT_Error |
| ft_stroke_border_conicto( FT_StrokeBorder border, |
| FT_Vector* control, |
| FT_Vector* to ) |
| { |
| FT_Error error; |
| |
| |
| FT_ASSERT( border->start >= 0 ); |
| |
| error = ft_stroke_border_grow( border, 2 ); |
| if ( !error ) |
| { |
| FT_Vector* vec = border->points + border->num_points; |
| FT_Byte* tag = border->tags + border->num_points; |
| |
| |
| vec[0] = *control; |
| vec[1] = *to; |
| |
| tag[0] = 0; |
| tag[1] = FT_STROKE_TAG_ON; |
| |
| border->num_points += 2; |
| } |
| |
| border->movable = FALSE; |
| |
| return error; |
| } |
| |
| |
| static FT_Error |
| ft_stroke_border_cubicto( FT_StrokeBorder border, |
| FT_Vector* control1, |
| FT_Vector* control2, |
| FT_Vector* to ) |
| { |
| FT_Error error; |
| |
| |
| FT_ASSERT( border->start >= 0 ); |
| |
| error = ft_stroke_border_grow( border, 3 ); |
| if ( !error ) |
| { |
| FT_Vector* vec = border->points + border->num_points; |
| FT_Byte* tag = border->tags + border->num_points; |
| |
| |
| vec[0] = *control1; |
| vec[1] = *control2; |
| vec[2] = *to; |
| |
| tag[0] = FT_STROKE_TAG_CUBIC; |
| tag[1] = FT_STROKE_TAG_CUBIC; |
| tag[2] = FT_STROKE_TAG_ON; |
| |
| border->num_points += 3; |
| } |
| |
| border->movable = FALSE; |
| |
| return error; |
| } |
| |
| |
| #define FT_ARC_CUBIC_ANGLE ( FT_ANGLE_PI / 2 ) |
| |
| |
| static FT_Error |
| ft_stroke_border_arcto( FT_StrokeBorder border, |
| FT_Vector* center, |
| FT_Fixed radius, |
| FT_Angle angle_start, |
| FT_Angle angle_diff ) |
| { |
| FT_Angle total, angle, step, rotate, next, theta; |
| FT_Vector a, b, a2, b2; |
| FT_Fixed length; |
| FT_Error error = FT_Err_Ok; |
| |
| |
| /* compute start point */ |
| FT_Vector_From_Polar( &a, radius, angle_start ); |
| a.x += center->x; |
| a.y += center->y; |
| |
| total = angle_diff; |
| angle = angle_start; |
| rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2 : -FT_ANGLE_PI2; |
| |
| while ( total != 0 ) |
| { |
| step = total; |
| if ( step > FT_ARC_CUBIC_ANGLE ) |
| step = FT_ARC_CUBIC_ANGLE; |
| |
| else if ( step < -FT_ARC_CUBIC_ANGLE ) |
| step = -FT_ARC_CUBIC_ANGLE; |
| |
| next = angle + step; |
| theta = step; |
| if ( theta < 0 ) |
| theta = -theta; |
| |
| theta >>= 1; |
| |
| /* compute end point */ |
| FT_Vector_From_Polar( &b, radius, next ); |
| b.x += center->x; |
| b.y += center->y; |
| |
| /* compute first and second control points */ |
| length = FT_MulDiv( radius, FT_Sin( theta ) * 4, |
| ( 0x10000L + FT_Cos( theta ) ) * 3 ); |
| |
| FT_Vector_From_Polar( &a2, length, angle + rotate ); |
| a2.x += a.x; |
| a2.y += a.y; |
| |
| FT_Vector_From_Polar( &b2, length, next - rotate ); |
| b2.x += b.x; |
| b2.y += b.y; |
| |
| /* add cubic arc */ |
| error = ft_stroke_border_cubicto( border, &a2, &b2, &b ); |
| if ( error ) |
| break; |
| |
| /* process the rest of the arc ?? */ |
| a = b; |
| total -= step; |
| angle = next; |
| } |
| |
| return error; |
| } |
| |
| |
| static FT_Error |
| ft_stroke_border_moveto( FT_StrokeBorder border, |
| FT_Vector* to ) |
| { |
| /* close current open path if any ? */ |
| if ( border->start >= 0 ) |
| ft_stroke_border_close( border, FALSE ); |
| |
| border->start = (FT_Int)border->num_points; |
| border->movable = FALSE; |
| |
| return ft_stroke_border_lineto( border, to, FALSE ); |
| } |
| |
| |
| static void |
| ft_stroke_border_init( FT_StrokeBorder border, |
| FT_Memory memory ) |
| { |
| border->memory = memory; |
| border->points = NULL; |
| border->tags = NULL; |
| |
| border->num_points = 0; |
| border->max_points = 0; |
| border->start = -1; |
| border->valid = FALSE; |
| } |
| |
| |
| static void |
| ft_stroke_border_reset( FT_StrokeBorder border ) |
| { |
| border->num_points = 0; |
| border->start = -1; |
| border->valid = FALSE; |
| } |
| |
| |
| static void |
| ft_stroke_border_done( FT_StrokeBorder border ) |
| { |
| FT_Memory memory = border->memory; |
| |
| |
| FT_FREE( border->points ); |
| FT_FREE( border->tags ); |
| |
| border->num_points = 0; |
| border->max_points = 0; |
| border->start = -1; |
| border->valid = FALSE; |
| } |
| |
| |
| static FT_Error |
| ft_stroke_border_get_counts( FT_StrokeBorder border, |
| FT_UInt *anum_points, |
| FT_UInt *anum_contours ) |
| { |
| FT_Error error = FT_Err_Ok; |
| FT_UInt num_points = 0; |
| FT_UInt num_contours = 0; |
| |
| FT_UInt count = border->num_points; |
| FT_Vector* point = border->points; |
| FT_Byte* tags = border->tags; |
| FT_Int in_contour = 0; |
| |
| |
| for ( ; count > 0; count--, num_points++, point++, tags++ ) |
| { |
| if ( tags[0] & FT_STROKE_TAG_BEGIN ) |
| { |
| if ( in_contour != 0 ) |
| goto Fail; |
| |
| in_contour = 1; |
| } |
| else if ( in_contour == 0 ) |
| goto Fail; |
| |
| if ( tags[0] & FT_STROKE_TAG_END ) |
| { |
| in_contour = 0; |
| num_contours++; |
| } |
| } |
| |
| if ( in_contour != 0 ) |
| goto Fail; |
| |
| border->valid = TRUE; |
| |
| Exit: |
| *anum_points = num_points; |
| *anum_contours = num_contours; |
| return error; |
| |
| Fail: |
| num_points = 0; |
| num_contours = 0; |
| goto Exit; |
| } |
| |
| |
| static void |
| ft_stroke_border_export( FT_StrokeBorder border, |
| FT_Outline* outline ) |
| { |
| /* copy point locations */ |
| FT_ARRAY_COPY( outline->points + outline->n_points, |
| border->points, |
| border->num_points ); |
| |
| /* copy tags */ |
| { |
| FT_UInt count = border->num_points; |
| FT_Byte* read = border->tags; |
| FT_Byte* write = (FT_Byte*)outline->tags + outline->n_points; |
| |
| |
| for ( ; count > 0; count--, read++, write++ ) |
| { |
| if ( *read & FT_STROKE_TAG_ON ) |
| *write = FT_CURVE_TAG_ON; |
| else if ( *read & FT_STROKE_TAG_CUBIC ) |
| *write = FT_CURVE_TAG_CUBIC; |
| else |
| *write = FT_CURVE_TAG_CONIC; |
| } |
| } |
| |
| /* copy contours */ |
| { |
| FT_UInt count = border->num_points; |
| FT_Byte* tags = border->tags; |
| FT_Short* write = outline->contours + outline->n_contours; |
| FT_Short idx = (FT_Short)outline->n_points; |
| |
| |
| for ( ; count > 0; count--, tags++, idx++ ) |
| { |
| if ( *tags & FT_STROKE_TAG_END ) |
| { |
| *write++ = idx; |
| outline->n_contours++; |
| } |
| } |
| } |
| |
| outline->n_points += (short)border->num_points; |
| |
| FT_ASSERT( FT_Outline_Check( outline ) == 0 ); |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** STROKER *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| #define FT_SIDE_TO_ROTATE( s ) ( FT_ANGLE_PI2 - (s) * FT_ANGLE_PI ) |
| |
| typedef struct FT_StrokerRec_ |
| { |
| FT_Angle angle_in; /* direction into curr join */ |
| FT_Angle angle_out; /* direction out of join */ |
| FT_Vector center; /* current position */ |
| FT_Fixed line_length; /* length of last lineto */ |
| FT_Bool first_point; /* is this the start? */ |
| FT_Bool subpath_open; /* is the subpath open? */ |
| FT_Angle subpath_angle; /* subpath start direction */ |
| FT_Vector subpath_start; /* subpath start position */ |
| FT_Fixed subpath_line_length; /* subpath start lineto len */ |
| FT_Bool handle_wide_strokes; /* use wide strokes logic? */ |
| |
| FT_Stroker_LineCap line_cap; |
| FT_Stroker_LineJoin line_join; |
| FT_Stroker_LineJoin line_join_saved; |
| FT_Fixed miter_limit; |
| FT_Fixed radius; |
| |
| FT_StrokeBorderRec borders[2]; |
| FT_Library library; |
| |
| } FT_StrokerRec; |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_New( FT_Library library, |
| FT_Stroker *astroker ) |
| { |
| FT_Error error; /* assigned in FT_NEW */ |
| FT_Memory memory; |
| FT_Stroker stroker = NULL; |
| |
| |
| if ( !library ) |
| return FT_THROW( Invalid_Library_Handle ); |
| |
| if ( !astroker ) |
| return FT_THROW( Invalid_Argument ); |
| |
| memory = library->memory; |
| |
| if ( !FT_NEW( stroker ) ) |
| { |
| stroker->library = library; |
| |
| ft_stroke_border_init( &stroker->borders[0], memory ); |
| ft_stroke_border_init( &stroker->borders[1], memory ); |
| } |
| |
| *astroker = stroker; |
| |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( void ) |
| FT_Stroker_Set( FT_Stroker stroker, |
| FT_Fixed radius, |
| FT_Stroker_LineCap line_cap, |
| FT_Stroker_LineJoin line_join, |
| FT_Fixed miter_limit ) |
| { |
| if ( !stroker ) |
| return; |
| |
| stroker->radius = radius; |
| stroker->line_cap = line_cap; |
| stroker->line_join = line_join; |
| stroker->miter_limit = miter_limit; |
| |
| /* ensure miter limit has sensible value */ |
| if ( stroker->miter_limit < 0x10000L ) |
| stroker->miter_limit = 0x10000L; |
| |
| /* save line join style: */ |
| /* line join style can be temporarily changed when stroking curves */ |
| stroker->line_join_saved = line_join; |
| |
| FT_Stroker_Rewind( stroker ); |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( void ) |
| FT_Stroker_Rewind( FT_Stroker stroker ) |
| { |
| if ( stroker ) |
| { |
| ft_stroke_border_reset( &stroker->borders[0] ); |
| ft_stroke_border_reset( &stroker->borders[1] ); |
| } |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( void ) |
| FT_Stroker_Done( FT_Stroker stroker ) |
| { |
| if ( stroker ) |
| { |
| FT_Memory memory = stroker->library->memory; |
| |
| |
| ft_stroke_border_done( &stroker->borders[0] ); |
| ft_stroke_border_done( &stroker->borders[1] ); |
| |
| stroker->library = NULL; |
| FT_FREE( stroker ); |
| } |
| } |
| |
| |
| /* create a circular arc at a corner or cap */ |
| static FT_Error |
| ft_stroker_arcto( FT_Stroker stroker, |
| FT_Int side ) |
| { |
| FT_Angle total, rotate; |
| FT_Fixed radius = stroker->radius; |
| FT_Error error = FT_Err_Ok; |
| FT_StrokeBorder border = stroker->borders + side; |
| |
| |
| rotate = FT_SIDE_TO_ROTATE( side ); |
| |
| total = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
| if ( total == FT_ANGLE_PI ) |
| total = -rotate * 2; |
| |
| error = ft_stroke_border_arcto( border, |
| &stroker->center, |
| radius, |
| stroker->angle_in + rotate, |
| total ); |
| border->movable = FALSE; |
| return error; |
| } |
| |
| |
| /* add a cap at the end of an opened path */ |
| static FT_Error |
| ft_stroker_cap( FT_Stroker stroker, |
| FT_Angle angle, |
| FT_Int side ) |
| { |
| FT_Error error = FT_Err_Ok; |
| |
| |
| if ( stroker->line_cap == FT_STROKER_LINECAP_ROUND ) |
| { |
| /* add a round cap */ |
| stroker->angle_in = angle; |
| stroker->angle_out = angle + FT_ANGLE_PI; |
| |
| error = ft_stroker_arcto( stroker, side ); |
| } |
| else if ( stroker->line_cap == FT_STROKER_LINECAP_SQUARE ) |
| { |
| /* add a square cap */ |
| FT_Vector delta, delta2; |
| FT_Angle rotate = FT_SIDE_TO_ROTATE( side ); |
| FT_Fixed radius = stroker->radius; |
| FT_StrokeBorder border = stroker->borders + side; |
| |
| |
| FT_Vector_From_Polar( &delta2, radius, angle + rotate ); |
| FT_Vector_From_Polar( &delta, radius, angle ); |
| |
| delta.x += stroker->center.x + delta2.x; |
| delta.y += stroker->center.y + delta2.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| if ( error ) |
| goto Exit; |
| |
| FT_Vector_From_Polar( &delta2, radius, angle - rotate ); |
| FT_Vector_From_Polar( &delta, radius, angle ); |
| |
| delta.x += delta2.x + stroker->center.x; |
| delta.y += delta2.y + stroker->center.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| } |
| else if ( stroker->line_cap == FT_STROKER_LINECAP_BUTT ) |
| { |
| /* add a butt ending */ |
| FT_Vector delta; |
| FT_Angle rotate = FT_SIDE_TO_ROTATE( side ); |
| FT_Fixed radius = stroker->radius; |
| FT_StrokeBorder border = stroker->borders + side; |
| |
| |
| FT_Vector_From_Polar( &delta, radius, angle + rotate ); |
| |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| if ( error ) |
| goto Exit; |
| |
| FT_Vector_From_Polar( &delta, radius, angle - rotate ); |
| |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| } |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* process an inside corner, i.e. compute intersection */ |
| static FT_Error |
| ft_stroker_inside( FT_Stroker stroker, |
| FT_Int side, |
| FT_Fixed line_length ) |
| { |
| FT_StrokeBorder border = stroker->borders + side; |
| FT_Angle phi, theta, rotate; |
| FT_Fixed length, thcos; |
| FT_Vector delta; |
| FT_Error error = FT_Err_Ok; |
| FT_Bool intersect; /* use intersection of lines? */ |
| |
| |
| rotate = FT_SIDE_TO_ROTATE( side ); |
| |
| theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ) / 2; |
| |
| /* Only intersect borders if between two lineto's and both */ |
| /* lines are long enough (line_length is zero for curves). */ |
| /* Also avoid U-turns of nearly 180 degree. */ |
| if ( !border->movable || line_length == 0 || |
| theta > 0x59C000 || theta < -0x59C000 ) |
| intersect = FALSE; |
| else |
| { |
| /* compute minimum required length of lines */ |
| FT_Fixed min_length = ft_pos_abs( FT_MulFix( stroker->radius, |
| FT_Tan( theta ) ) ); |
| |
| |
| intersect = FT_BOOL( min_length && |
| stroker->line_length >= min_length && |
| line_length >= min_length ); |
| } |
| |
| if ( !intersect ) |
| { |
| FT_Vector_From_Polar( &delta, stroker->radius, |
| stroker->angle_out + rotate ); |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| |
| border->movable = FALSE; |
| } |
| else |
| { |
| /* compute median angle */ |
| phi = stroker->angle_in + theta; |
| |
| thcos = FT_Cos( theta ); |
| |
| length = FT_DivFix( stroker->radius, thcos ); |
| |
| FT_Vector_From_Polar( &delta, length, phi + rotate ); |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| } |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| |
| return error; |
| } |
| |
| |
| /* process an outside corner, i.e. compute bevel/miter/round */ |
| static FT_Error |
| ft_stroker_outside( FT_Stroker stroker, |
| FT_Int side, |
| FT_Fixed line_length ) |
| { |
| FT_StrokeBorder border = stroker->borders + side; |
| FT_Error error; |
| FT_Angle rotate; |
| |
| |
| if ( stroker->line_join == FT_STROKER_LINEJOIN_ROUND ) |
| error = ft_stroker_arcto( stroker, side ); |
| else |
| { |
| /* this is a mitered (pointed) or beveled (truncated) corner */ |
| FT_Fixed sigma = 0, radius = stroker->radius; |
| FT_Angle theta = 0, phi = 0; |
| FT_Fixed thcos = 0; |
| FT_Bool bevel, fixed_bevel; |
| |
| |
| rotate = FT_SIDE_TO_ROTATE( side ); |
| |
| bevel = |
| FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_BEVEL ); |
| |
| fixed_bevel = |
| FT_BOOL( stroker->line_join != FT_STROKER_LINEJOIN_MITER_VARIABLE ); |
| |
| if ( !bevel ) |
| { |
| theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
| |
| if ( theta == FT_ANGLE_PI ) |
| { |
| theta = rotate; |
| phi = stroker->angle_in; |
| } |
| else |
| { |
| theta /= 2; |
| phi = stroker->angle_in + theta + rotate; |
| } |
| |
| thcos = FT_Cos( theta ); |
| sigma = FT_MulFix( stroker->miter_limit, thcos ); |
| |
| /* is miter limit exceeded? */ |
| if ( sigma < 0x10000L ) |
| { |
| /* don't create variable bevels for very small deviations; */ |
| /* FT_Sin(x) = 0 for x <= 57 */ |
| if ( fixed_bevel || ft_pos_abs( theta ) > 57 ) |
| bevel = TRUE; |
| } |
| } |
| |
| if ( bevel ) /* this is a bevel (broken angle) */ |
| { |
| if ( fixed_bevel ) |
| { |
| /* the outer corners are simply joined together */ |
| FT_Vector delta; |
| |
| |
| /* add bevel */ |
| FT_Vector_From_Polar( &delta, |
| radius, |
| stroker->angle_out + rotate ); |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| |
| border->movable = FALSE; |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| } |
| else /* variable bevel */ |
| { |
| /* the miter is truncated */ |
| FT_Vector middle, delta; |
| FT_Fixed length; |
| |
| |
| /* compute middle point */ |
| FT_Vector_From_Polar( &middle, |
| FT_MulFix( radius, stroker->miter_limit ), |
| phi ); |
| middle.x += stroker->center.x; |
| middle.y += stroker->center.y; |
| |
| /* compute first angle point */ |
| length = FT_MulDiv( radius, 0x10000L - sigma, |
| ft_pos_abs( FT_Sin( theta ) ) ); |
| |
| FT_Vector_From_Polar( &delta, length, phi + rotate ); |
| delta.x += middle.x; |
| delta.y += middle.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| if ( error ) |
| goto Exit; |
| |
| /* compute second angle point */ |
| FT_Vector_From_Polar( &delta, length, phi - rotate ); |
| delta.x += middle.x; |
| delta.y += middle.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| if ( error ) |
| goto Exit; |
| |
| /* finally, add an end point; only needed if not lineto */ |
| /* (line_length is zero for curves) */ |
| if ( line_length == 0 ) |
| { |
| FT_Vector_From_Polar( &delta, |
| radius, |
| stroker->angle_out + rotate ); |
| |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| } |
| } |
| } |
| else /* this is a miter (intersection) */ |
| { |
| FT_Fixed length; |
| FT_Vector delta; |
| |
| |
| length = FT_DivFix( stroker->radius, thcos ); |
| |
| FT_Vector_From_Polar( &delta, length, phi ); |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| if ( error ) |
| goto Exit; |
| |
| /* now add an end point; only needed if not lineto */ |
| /* (line_length is zero for curves) */ |
| if ( line_length == 0 ) |
| { |
| FT_Vector_From_Polar( &delta, |
| stroker->radius, |
| stroker->angle_out + rotate ); |
| delta.x += stroker->center.x; |
| delta.y += stroker->center.y; |
| |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| } |
| } |
| } |
| |
| Exit: |
| return error; |
| } |
| |
| |
| static FT_Error |
| ft_stroker_process_corner( FT_Stroker stroker, |
| FT_Fixed line_length ) |
| { |
| FT_Error error = FT_Err_Ok; |
| FT_Angle turn; |
| FT_Int inside_side; |
| |
| |
| turn = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
| |
| /* no specific corner processing is required if the turn is 0 */ |
| if ( turn == 0 ) |
| goto Exit; |
| |
| /* when we turn to the right, the inside side is 0 */ |
| /* otherwise, the inside side is 1 */ |
| inside_side = ( turn < 0 ); |
| |
| /* process the inside side */ |
| error = ft_stroker_inside( stroker, inside_side, line_length ); |
| if ( error ) |
| goto Exit; |
| |
| /* process the outside side */ |
| error = ft_stroker_outside( stroker, !inside_side, line_length ); |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* add two points to the left and right borders corresponding to the */ |
| /* start of the subpath */ |
| static FT_Error |
| ft_stroker_subpath_start( FT_Stroker stroker, |
| FT_Angle start_angle, |
| FT_Fixed line_length ) |
| { |
| FT_Vector delta; |
| FT_Vector point; |
| FT_Error error; |
| FT_StrokeBorder border; |
| |
| |
| FT_Vector_From_Polar( &delta, stroker->radius, |
| start_angle + FT_ANGLE_PI2 ); |
| |
| point.x = stroker->center.x + delta.x; |
| point.y = stroker->center.y + delta.y; |
| |
| border = stroker->borders; |
| error = ft_stroke_border_moveto( border, &point ); |
| if ( error ) |
| goto Exit; |
| |
| point.x = stroker->center.x - delta.x; |
| point.y = stroker->center.y - delta.y; |
| |
| border++; |
| error = ft_stroke_border_moveto( border, &point ); |
| |
| /* save angle, position, and line length for last join */ |
| /* (line_length is zero for curves) */ |
| stroker->subpath_angle = start_angle; |
| stroker->first_point = FALSE; |
| stroker->subpath_line_length = line_length; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_LineTo( FT_Stroker stroker, |
| FT_Vector* to ) |
| { |
| FT_Error error = FT_Err_Ok; |
| FT_StrokeBorder border; |
| FT_Vector delta; |
| FT_Angle angle; |
| FT_Int side; |
| FT_Fixed line_length; |
| |
| |
| if ( !stroker || !to ) |
| return FT_THROW( Invalid_Argument ); |
| |
| delta.x = to->x - stroker->center.x; |
| delta.y = to->y - stroker->center.y; |
| |
| /* a zero-length lineto is a no-op; avoid creating a spurious corner */ |
| if ( delta.x == 0 && delta.y == 0 ) |
| goto Exit; |
| |
| /* compute length of line */ |
| line_length = FT_Vector_Length( &delta ); |
| |
| angle = FT_Atan2( delta.x, delta.y ); |
| FT_Vector_From_Polar( &delta, stroker->radius, angle + FT_ANGLE_PI2 ); |
| |
| /* process corner if necessary */ |
| if ( stroker->first_point ) |
| { |
| /* This is the first segment of a subpath. We need to */ |
| /* add a point to each border at their respective starting */ |
| /* point locations. */ |
| error = ft_stroker_subpath_start( stroker, angle, line_length ); |
| if ( error ) |
| goto Exit; |
| } |
| else |
| { |
| /* process the current corner */ |
| stroker->angle_out = angle; |
| error = ft_stroker_process_corner( stroker, line_length ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| /* now add a line segment to both the `inside' and `outside' paths */ |
| for ( border = stroker->borders, side = 1; side >= 0; side--, border++ ) |
| { |
| FT_Vector point; |
| |
| |
| point.x = to->x + delta.x; |
| point.y = to->y + delta.y; |
| |
| /* the ends of lineto borders are movable */ |
| error = ft_stroke_border_lineto( border, &point, TRUE ); |
| if ( error ) |
| goto Exit; |
| |
| delta.x = -delta.x; |
| delta.y = -delta.y; |
| } |
| |
| stroker->angle_in = angle; |
| stroker->center = *to; |
| stroker->line_length = line_length; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_ConicTo( FT_Stroker stroker, |
| FT_Vector* control, |
| FT_Vector* to ) |
| { |
| FT_Error error = FT_Err_Ok; |
| FT_Vector bez_stack[34]; |
| FT_Vector* arc; |
| FT_Vector* limit = bez_stack + 30; |
| FT_Bool first_arc = TRUE; |
| |
| |
| if ( !stroker || !control || !to ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| /* if all control points are coincident, this is a no-op; */ |
| /* avoid creating a spurious corner */ |
| if ( FT_IS_SMALL( stroker->center.x - control->x ) && |
| FT_IS_SMALL( stroker->center.y - control->y ) && |
| FT_IS_SMALL( control->x - to->x ) && |
| FT_IS_SMALL( control->y - to->y ) ) |
| { |
| stroker->center = *to; |
| goto Exit; |
| } |
| |
| arc = bez_stack; |
| arc[0] = *to; |
| arc[1] = *control; |
| arc[2] = stroker->center; |
| |
| while ( arc >= bez_stack ) |
| { |
| FT_Angle angle_in, angle_out; |
| |
| |
| /* initialize with current direction */ |
| angle_in = angle_out = stroker->angle_in; |
| |
| if ( arc < limit && |
| !ft_conic_is_small_enough( arc, &angle_in, &angle_out ) ) |
| { |
| if ( stroker->first_point ) |
| stroker->angle_in = angle_in; |
| |
| ft_conic_split( arc ); |
| arc += 2; |
| continue; |
| } |
| |
| if ( first_arc ) |
| { |
| first_arc = FALSE; |
| |
| /* process corner if necessary */ |
| if ( stroker->first_point ) |
| error = ft_stroker_subpath_start( stroker, angle_in, 0 ); |
| else |
| { |
| stroker->angle_out = angle_in; |
| error = ft_stroker_process_corner( stroker, 0 ); |
| } |
| } |
| else if ( ft_pos_abs( FT_Angle_Diff( stroker->angle_in, angle_in ) ) > |
| FT_SMALL_CONIC_THRESHOLD / 4 ) |
| { |
| /* if the deviation from one arc to the next is too great, */ |
| /* add a round corner */ |
| stroker->center = arc[2]; |
| stroker->angle_out = angle_in; |
| stroker->line_join = FT_STROKER_LINEJOIN_ROUND; |
| |
| error = ft_stroker_process_corner( stroker, 0 ); |
| |
| /* reinstate line join style */ |
| stroker->line_join = stroker->line_join_saved; |
| } |
| |
| if ( error ) |
| goto Exit; |
| |
| /* the arc's angle is small enough; we can add it directly to each */ |
| /* border */ |
| { |
| FT_Vector ctrl, end; |
| FT_Angle theta, phi, rotate, alpha0 = 0; |
| FT_Fixed length; |
| FT_StrokeBorder border; |
| FT_Int side; |
| |
| |
| theta = FT_Angle_Diff( angle_in, angle_out ) / 2; |
| phi = angle_in + theta; |
| length = FT_DivFix( stroker->radius, FT_Cos( theta ) ); |
| |
| /* compute direction of original arc */ |
| if ( stroker->handle_wide_strokes ) |
| alpha0 = FT_Atan2( arc[0].x - arc[2].x, arc[0].y - arc[2].y ); |
| |
| for ( border = stroker->borders, side = 0; |
| side <= 1; |
| side++, border++ ) |
| { |
| rotate = FT_SIDE_TO_ROTATE( side ); |
| |
| /* compute control point */ |
| FT_Vector_From_Polar( &ctrl, length, phi + rotate ); |
| ctrl.x += arc[1].x; |
| ctrl.y += arc[1].y; |
| |
| /* compute end point */ |
| FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate ); |
| end.x += arc[0].x; |
| end.y += arc[0].y; |
| |
| if ( stroker->handle_wide_strokes ) |
| { |
| FT_Vector start; |
| FT_Angle alpha1; |
| |
| |
| /* determine whether the border radius is greater than the */ |
| /* radius of curvature of the original arc */ |
| start = border->points[border->num_points - 1]; |
| |
| alpha1 = FT_Atan2( end.x - start.x, end.y - start.y ); |
| |
| /* is the direction of the border arc opposite to */ |
| /* that of the original arc? */ |
| if ( ft_pos_abs( FT_Angle_Diff( alpha0, alpha1 ) ) > |
| FT_ANGLE_PI / 2 ) |
| { |
| FT_Angle beta, gamma; |
| FT_Vector bvec, delta; |
| FT_Fixed blen, sinA, sinB, alen; |
| |
| |
| /* use the sine rule to find the intersection point */ |
| beta = FT_Atan2( arc[2].x - start.x, arc[2].y - start.y ); |
| gamma = FT_Atan2( arc[0].x - end.x, arc[0].y - end.y ); |
| |
| bvec.x = end.x - start.x; |
| bvec.y = end.y - start.y; |
| |
| blen = FT_Vector_Length( &bvec ); |
| |
| sinA = ft_pos_abs( FT_Sin( alpha1 - gamma ) ); |
| sinB = ft_pos_abs( FT_Sin( beta - gamma ) ); |
| |
| alen = FT_MulDiv( blen, sinA, sinB ); |
| |
| FT_Vector_From_Polar( &delta, alen, beta ); |
| delta.x += start.x; |
| delta.y += start.y; |
| |
| /* circumnavigate the negative sector backwards */ |
| border->movable = FALSE; |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| if ( error ) |
| goto Exit; |
| error = ft_stroke_border_lineto( border, &end, FALSE ); |
| if ( error ) |
| goto Exit; |
| error = ft_stroke_border_conicto( border, &ctrl, &start ); |
| if ( error ) |
| goto Exit; |
| /* and then move to the endpoint */ |
| error = ft_stroke_border_lineto( border, &end, FALSE ); |
| if ( error ) |
| goto Exit; |
| |
| continue; |
| } |
| |
| /* else fall through */ |
| } |
| |
| /* simply add an arc */ |
| error = ft_stroke_border_conicto( border, &ctrl, &end ); |
| if ( error ) |
| goto Exit; |
| } |
| } |
| |
| arc -= 2; |
| |
| stroker->angle_in = angle_out; |
| } |
| |
| stroker->center = *to; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_CubicTo( FT_Stroker stroker, |
| FT_Vector* control1, |
| FT_Vector* control2, |
| FT_Vector* to ) |
| { |
| FT_Error error = FT_Err_Ok; |
| FT_Vector bez_stack[37]; |
| FT_Vector* arc; |
| FT_Vector* limit = bez_stack + 32; |
| FT_Bool first_arc = TRUE; |
| |
| |
| if ( !stroker || !control1 || !control2 || !to ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| /* if all control points are coincident, this is a no-op; */ |
| /* avoid creating a spurious corner */ |
| if ( FT_IS_SMALL( stroker->center.x - control1->x ) && |
| FT_IS_SMALL( stroker->center.y - control1->y ) && |
| FT_IS_SMALL( control1->x - control2->x ) && |
| FT_IS_SMALL( control1->y - control2->y ) && |
| FT_IS_SMALL( control2->x - to->x ) && |
| FT_IS_SMALL( control2->y - to->y ) ) |
| { |
| stroker->center = *to; |
| goto Exit; |
| } |
| |
| arc = bez_stack; |
| arc[0] = *to; |
| arc[1] = *control2; |
| arc[2] = *control1; |
| arc[3] = stroker->center; |
| |
| while ( arc >= bez_stack ) |
| { |
| FT_Angle angle_in, angle_mid, angle_out; |
| |
| |
| /* initialize with current direction */ |
| angle_in = angle_out = angle_mid = stroker->angle_in; |
| |
| if ( arc < limit && |
| !ft_cubic_is_small_enough( arc, &angle_in, |
| &angle_mid, &angle_out ) ) |
| { |
| if ( stroker->first_point ) |
| stroker->angle_in = angle_in; |
| |
| ft_cubic_split( arc ); |
| arc += 3; |
| continue; |
| } |
| |
| if ( first_arc ) |
| { |
| first_arc = FALSE; |
| |
| /* process corner if necessary */ |
| if ( stroker->first_point ) |
| error = ft_stroker_subpath_start( stroker, angle_in, 0 ); |
| else |
| { |
| stroker->angle_out = angle_in; |
| error = ft_stroker_process_corner( stroker, 0 ); |
| } |
| } |
| else if ( ft_pos_abs( FT_Angle_Diff( stroker->angle_in, angle_in ) ) > |
| FT_SMALL_CUBIC_THRESHOLD / 4 ) |
| { |
| /* if the deviation from one arc to the next is too great, */ |
| /* add a round corner */ |
| stroker->center = arc[3]; |
| stroker->angle_out = angle_in; |
| stroker->line_join = FT_STROKER_LINEJOIN_ROUND; |
| |
| error = ft_stroker_process_corner( stroker, 0 ); |
| |
| /* reinstate line join style */ |
| stroker->line_join = stroker->line_join_saved; |
| } |
| |
| if ( error ) |
| goto Exit; |
| |
| /* the arc's angle is small enough; we can add it directly to each */ |
| /* border */ |
| { |
| FT_Vector ctrl1, ctrl2, end; |
| FT_Angle theta1, phi1, theta2, phi2, rotate, alpha0 = 0; |
| FT_Fixed length1, length2; |
| FT_StrokeBorder border; |
| FT_Int side; |
| |
| |
| theta1 = FT_Angle_Diff( angle_in, angle_mid ) / 2; |
| theta2 = FT_Angle_Diff( angle_mid, angle_out ) / 2; |
| phi1 = ft_angle_mean( angle_in, angle_mid ); |
| phi2 = ft_angle_mean( angle_mid, angle_out ); |
| length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) ); |
| length2 = FT_DivFix( stroker->radius, FT_Cos( theta2 ) ); |
| |
| /* compute direction of original arc */ |
| if ( stroker->handle_wide_strokes ) |
| alpha0 = FT_Atan2( arc[0].x - arc[3].x, arc[0].y - arc[3].y ); |
| |
| for ( border = stroker->borders, side = 0; |
| side <= 1; |
| side++, border++ ) |
| { |
| rotate = FT_SIDE_TO_ROTATE( side ); |
| |
| /* compute control points */ |
| FT_Vector_From_Polar( &ctrl1, length1, phi1 + rotate ); |
| ctrl1.x += arc[2].x; |
| ctrl1.y += arc[2].y; |
| |
| FT_Vector_From_Polar( &ctrl2, length2, phi2 + rotate ); |
| ctrl2.x += arc[1].x; |
| ctrl2.y += arc[1].y; |
| |
| /* compute end point */ |
| FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate ); |
| end.x += arc[0].x; |
| end.y += arc[0].y; |
| |
| if ( stroker->handle_wide_strokes ) |
| { |
| FT_Vector start; |
| FT_Angle alpha1; |
| |
| |
| /* determine whether the border radius is greater than the */ |
| /* radius of curvature of the original arc */ |
| start = border->points[border->num_points - 1]; |
| |
| alpha1 = FT_Atan2( end.x - start.x, end.y - start.y ); |
| |
| /* is the direction of the border arc opposite to */ |
| /* that of the original arc? */ |
| if ( ft_pos_abs( FT_Angle_Diff( alpha0, alpha1 ) ) > |
| FT_ANGLE_PI / 2 ) |
| { |
| FT_Angle beta, gamma; |
| FT_Vector bvec, delta; |
| FT_Fixed blen, sinA, sinB, alen; |
| |
| |
| /* use the sine rule to find the intersection point */ |
| beta = FT_Atan2( arc[3].x - start.x, arc[3].y - start.y ); |
| gamma = FT_Atan2( arc[0].x - end.x, arc[0].y - end.y ); |
| |
| bvec.x = end.x - start.x; |
| bvec.y = end.y - start.y; |
| |
| blen = FT_Vector_Length( &bvec ); |
| |
| sinA = ft_pos_abs( FT_Sin( alpha1 - gamma ) ); |
| sinB = ft_pos_abs( FT_Sin( beta - gamma ) ); |
| |
| alen = FT_MulDiv( blen, sinA, sinB ); |
| |
| FT_Vector_From_Polar( &delta, alen, beta ); |
| delta.x += start.x; |
| delta.y += start.y; |
| |
| /* circumnavigate the negative sector backwards */ |
| border->movable = FALSE; |
| error = ft_stroke_border_lineto( border, &delta, FALSE ); |
| if ( error ) |
| goto Exit; |
| error = ft_stroke_border_lineto( border, &end, FALSE ); |
| if ( error ) |
| goto Exit; |
| error = ft_stroke_border_cubicto( border, |
| &ctrl2, |
| &ctrl1, |
| &start ); |
| if ( error ) |
| goto Exit; |
| /* and then move to the endpoint */ |
| error = ft_stroke_border_lineto( border, &end, FALSE ); |
| if ( error ) |
| goto Exit; |
| |
| continue; |
| } |
| |
| /* else fall through */ |
| } |
| |
| /* simply add an arc */ |
| error = ft_stroke_border_cubicto( border, &ctrl1, &ctrl2, &end ); |
| if ( error ) |
| goto Exit; |
| } |
| } |
| |
| arc -= 3; |
| |
| stroker->angle_in = angle_out; |
| } |
| |
| stroker->center = *to; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_BeginSubPath( FT_Stroker stroker, |
| FT_Vector* to, |
| FT_Bool open ) |
| { |
| if ( !stroker || !to ) |
| return FT_THROW( Invalid_Argument ); |
| |
| /* We cannot process the first point, because there is not enough */ |
| /* information regarding its corner/cap. The latter will be processed */ |
| /* in the `FT_Stroker_EndSubPath' routine. */ |
| /* */ |
| stroker->first_point = TRUE; |
| stroker->center = *to; |
| stroker->subpath_open = open; |
| |
| /* Determine if we need to check whether the border radius is greater */ |
| /* than the radius of curvature of a curve, to handle this case */ |
| /* specially. This is only required if bevel joins or butt caps may */ |
| /* be created, because round & miter joins and round & square caps */ |
| /* cover the negative sector created with wide strokes. */ |
| stroker->handle_wide_strokes = |
| FT_BOOL( stroker->line_join != FT_STROKER_LINEJOIN_ROUND || |
| ( stroker->subpath_open && |
| stroker->line_cap == FT_STROKER_LINECAP_BUTT ) ); |
| |
| /* record the subpath start point for each border */ |
| stroker->subpath_start = *to; |
| |
| stroker->angle_in = 0; |
| |
| return FT_Err_Ok; |
| } |
| |
| |
| static FT_Error |
| ft_stroker_add_reverse_left( FT_Stroker stroker, |
| FT_Bool open ) |
| { |
| FT_StrokeBorder right = stroker->borders + 0; |
| FT_StrokeBorder left = stroker->borders + 1; |
| FT_Int new_points; |
| FT_Error error = FT_Err_Ok; |
| |
| |
| FT_ASSERT( left->start >= 0 ); |
| |
| new_points = (FT_Int)left->num_points - left->start; |
| if ( new_points > 0 ) |
| { |
| error = ft_stroke_border_grow( right, (FT_UInt)new_points ); |
| if ( error ) |
| goto Exit; |
| |
| { |
| FT_Vector* dst_point = right->points + right->num_points; |
| FT_Byte* dst_tag = right->tags + right->num_points; |
| FT_Vector* src_point = left->points + left->num_points - 1; |
| FT_Byte* src_tag = left->tags + left->num_points - 1; |
| |
| |
| while ( src_point >= left->points + left->start ) |
| { |
| *dst_point = *src_point; |
| *dst_tag = *src_tag; |
| |
| if ( open ) |
| dst_tag[0] &= ~FT_STROKE_TAG_BEGIN_END; |
| else |
| { |
| FT_Byte ttag = |
| (FT_Byte)( dst_tag[0] & FT_STROKE_TAG_BEGIN_END ); |
| |
| |
| /* switch begin/end tags if necessary */ |
| if ( ttag == FT_STROKE_TAG_BEGIN || |
| ttag == FT_STROKE_TAG_END ) |
| dst_tag[0] ^= FT_STROKE_TAG_BEGIN_END; |
| } |
| |
| src_point--; |
| src_tag--; |
| dst_point++; |
| dst_tag++; |
| } |
| } |
| |
| left->num_points = (FT_UInt)left->start; |
| right->num_points += (FT_UInt)new_points; |
| |
| right->movable = FALSE; |
| left->movable = FALSE; |
| } |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| /* there's a lot of magic in this function! */ |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_EndSubPath( FT_Stroker stroker ) |
| { |
| FT_Error error = FT_Err_Ok; |
| |
| |
| if ( !stroker ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| if ( stroker->subpath_open ) |
| { |
| FT_StrokeBorder right = stroker->borders; |
| |
| |
| /* All right, this is an opened path, we need to add a cap between */ |
| /* right & left, add the reverse of left, then add a final cap */ |
| /* between left & right. */ |
| error = ft_stroker_cap( stroker, stroker->angle_in, 0 ); |
| if ( error ) |
| goto Exit; |
| |
| /* add reversed points from `left' to `right' */ |
| error = ft_stroker_add_reverse_left( stroker, TRUE ); |
| if ( error ) |
| goto Exit; |
| |
| /* now add the final cap */ |
| stroker->center = stroker->subpath_start; |
| error = ft_stroker_cap( stroker, |
| stroker->subpath_angle + FT_ANGLE_PI, 0 ); |
| if ( error ) |
| goto Exit; |
| |
| /* Now end the right subpath accordingly. The left one is */ |
| /* rewind and doesn't need further processing. */ |
| ft_stroke_border_close( right, FALSE ); |
| } |
| else |
| { |
| FT_Angle turn; |
| FT_Int inside_side; |
| |
| |
| /* close the path if needed */ |
| if ( stroker->center.x != stroker->subpath_start.x || |
| stroker->center.y != stroker->subpath_start.y ) |
| { |
| error = FT_Stroker_LineTo( stroker, &stroker->subpath_start ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| /* process the corner */ |
| stroker->angle_out = stroker->subpath_angle; |
| turn = FT_Angle_Diff( stroker->angle_in, |
| stroker->angle_out ); |
| |
| /* no specific corner processing is required if the turn is 0 */ |
| if ( turn != 0 ) |
| { |
| /* when we turn to the right, the inside side is 0 */ |
| /* otherwise, the inside side is 1 */ |
| inside_side = ( turn < 0 ); |
| |
| error = ft_stroker_inside( stroker, |
| inside_side, |
| stroker->subpath_line_length ); |
| if ( error ) |
| goto Exit; |
| |
| /* process the outside side */ |
| error = ft_stroker_outside( stroker, |
| !inside_side, |
| stroker->subpath_line_length ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| /* then end our two subpaths */ |
| ft_stroke_border_close( stroker->borders + 0, FALSE ); |
| ft_stroke_border_close( stroker->borders + 1, TRUE ); |
| } |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_GetBorderCounts( FT_Stroker stroker, |
| FT_StrokerBorder border, |
| FT_UInt *anum_points, |
| FT_UInt *anum_contours ) |
| { |
| FT_UInt num_points = 0, num_contours = 0; |
| FT_Error error; |
| |
| |
| if ( !stroker || border > 1 ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| error = ft_stroke_border_get_counts( stroker->borders + border, |
| &num_points, &num_contours ); |
| Exit: |
| if ( anum_points ) |
| *anum_points = num_points; |
| |
| if ( anum_contours ) |
| *anum_contours = num_contours; |
| |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_GetCounts( FT_Stroker stroker, |
| FT_UInt *anum_points, |
| FT_UInt *anum_contours ) |
| { |
| FT_UInt count1, count2, num_points = 0; |
| FT_UInt count3, count4, num_contours = 0; |
| FT_Error error; |
| |
| |
| if ( !stroker ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| error = ft_stroke_border_get_counts( stroker->borders + 0, |
| &count1, &count2 ); |
| if ( error ) |
| goto Exit; |
| |
| error = ft_stroke_border_get_counts( stroker->borders + 1, |
| &count3, &count4 ); |
| if ( error ) |
| goto Exit; |
| |
| num_points = count1 + count3; |
| num_contours = count2 + count4; |
| |
| Exit: |
| if ( anum_points ) |
| *anum_points = num_points; |
| |
| if ( anum_contours ) |
| *anum_contours = num_contours; |
| |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( void ) |
| FT_Stroker_ExportBorder( FT_Stroker stroker, |
| FT_StrokerBorder border, |
| FT_Outline* outline ) |
| { |
| if ( !stroker || !outline ) |
| return; |
| |
| if ( border == FT_STROKER_BORDER_LEFT || |
| border == FT_STROKER_BORDER_RIGHT ) |
| { |
| FT_StrokeBorder sborder = & stroker->borders[border]; |
| |
| |
| if ( sborder->valid ) |
| ft_stroke_border_export( sborder, outline ); |
| } |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( void ) |
| FT_Stroker_Export( FT_Stroker stroker, |
| FT_Outline* outline ) |
| { |
| FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_LEFT, outline ); |
| FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_RIGHT, outline ); |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| /* |
| * The following is very similar to FT_Outline_Decompose, except |
| * that we do support opened paths, and do not scale the outline. |
| */ |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Stroker_ParseOutline( FT_Stroker stroker, |
| FT_Outline* outline, |
| FT_Bool opened ) |
| { |
| 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 */ |
| |
| |
| if ( !outline ) |
| return FT_THROW( Invalid_Outline ); |
| |
| if ( !stroker ) |
| return FT_THROW( Invalid_Argument ); |
| |
| FT_Stroker_Rewind( stroker ); |
| |
| first = 0; |
| |
| for ( n = 0; n < outline->n_contours; n++ ) |
| { |
| FT_UInt last; /* index of last point in contour */ |
| |
| |
| last = (FT_UInt)outline->contours[n]; |
| limit = outline->points + last; |
| |
| /* skip empty points; we don't stroke these */ |
| if ( last <= first ) |
| { |
| first = last + 1; |
| continue; |
| } |
| |
| v_start = outline->points[first]; |
| v_last = outline->points[last]; |
| |
| 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 */ |
| v_start.x = ( v_start.x + v_last.x ) / 2; |
| v_start.y = ( v_start.y + v_last.y ) / 2; |
| } |
| point--; |
| tags--; |
| } |
| |
| error = FT_Stroker_BeginSubPath( stroker, &v_start, opened ); |
| 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 = point->x; |
| vec.y = point->y; |
| |
| error = FT_Stroker_LineTo( stroker, &vec ); |
| if ( error ) |
| goto Exit; |
| continue; |
| } |
| |
| case FT_CURVE_TAG_CONIC: /* consume conic arcs */ |
| v_control.x = point->x; |
| v_control.y = point->y; |
| |
| Do_Conic: |
| if ( point < limit ) |
| { |
| FT_Vector vec; |
| FT_Vector v_middle; |
| |
| |
| point++; |
| tags++; |
| tag = FT_CURVE_TAG( tags[0] ); |
| |
| vec = point[0]; |
| |
| if ( tag == FT_CURVE_TAG_ON ) |
| { |
| error = FT_Stroker_ConicTo( stroker, &v_control, &vec ); |
| 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; |
| |
| error = FT_Stroker_ConicTo( stroker, &v_control, &v_middle ); |
| if ( error ) |
| goto Exit; |
| |
| v_control = vec; |
| goto Do_Conic; |
| } |
| |
| error = FT_Stroker_ConicTo( stroker, &v_control, &v_start ); |
| 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 = point[-2]; |
| vec2 = point[-1]; |
| |
| if ( point <= limit ) |
| { |
| FT_Vector vec; |
| |
| |
| vec = point[0]; |
| |
| error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &vec ); |
| if ( error ) |
| goto Exit; |
| continue; |
| } |
| |
| error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &v_start ); |
| goto Close; |
| } |
| } |
| } |
| |
| Close: |
| if ( error ) |
| goto Exit; |
| |
| /* don't try to end the path if no segments have been generated */ |
| if ( !stroker->first_point ) |
| { |
| error = FT_Stroker_EndSubPath( stroker ); |
| if ( error ) |
| goto Exit; |
| } |
| |
| first = last + 1; |
| } |
| |
| return FT_Err_Ok; |
| |
| Exit: |
| return error; |
| |
| Invalid_Outline: |
| return FT_THROW( Invalid_Outline ); |
| } |
| |
| |
| /* declare an extern to access `ft_outline_glyph_class' globally */ |
| /* allocated in `ftglyph.c', and use the FT_OUTLINE_GLYPH_CLASS_GET */ |
| /* macro to access it when FT_CONFIG_OPTION_PIC is defined */ |
| #ifndef FT_CONFIG_OPTION_PIC |
| extern const FT_Glyph_Class ft_outline_glyph_class; |
| #endif |
| #include "basepic.h" |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Glyph_Stroke( FT_Glyph *pglyph, |
| FT_Stroker stroker, |
| FT_Bool destroy ) |
| { |
| FT_Error error = FT_ERR( Invalid_Argument ); |
| FT_Glyph glyph = NULL; |
| |
| /* for FT_OUTLINE_GLYPH_CLASS_GET (in PIC mode) */ |
| FT_Library library = stroker->library; |
| |
| FT_UNUSED( library ); |
| |
| |
| if ( !pglyph ) |
| goto Exit; |
| |
| glyph = *pglyph; |
| if ( !glyph || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET ) |
| goto Exit; |
| |
| { |
| FT_Glyph copy; |
| |
| |
| error = FT_Glyph_Copy( glyph, © ); |
| if ( error ) |
| goto Exit; |
| |
| glyph = copy; |
| } |
| |
| { |
| FT_OutlineGlyph oglyph = (FT_OutlineGlyph)glyph; |
| FT_Outline* outline = &oglyph->outline; |
| FT_UInt num_points, num_contours; |
| |
| |
| error = FT_Stroker_ParseOutline( stroker, outline, FALSE ); |
| if ( error ) |
| goto Fail; |
| |
| FT_Stroker_GetCounts( stroker, &num_points, &num_contours ); |
| |
| FT_Outline_Done( glyph->library, outline ); |
| |
| error = FT_Outline_New( glyph->library, |
| num_points, |
| (FT_Int)num_contours, |
| outline ); |
| if ( error ) |
| goto Fail; |
| |
| outline->n_points = 0; |
| outline->n_contours = 0; |
| |
| FT_Stroker_Export( stroker, outline ); |
| } |
| |
| if ( destroy ) |
| FT_Done_Glyph( *pglyph ); |
| |
| *pglyph = glyph; |
| goto Exit; |
| |
| Fail: |
| FT_Done_Glyph( glyph ); |
| glyph = NULL; |
| |
| if ( !destroy ) |
| *pglyph = NULL; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* documentation is in ftstroke.h */ |
| |
| FT_EXPORT_DEF( FT_Error ) |
| FT_Glyph_StrokeBorder( FT_Glyph *pglyph, |
| FT_Stroker stroker, |
| FT_Bool inside, |
| FT_Bool destroy ) |
| { |
| FT_Error error = FT_ERR( Invalid_Argument ); |
| FT_Glyph glyph = NULL; |
| |
| /* for FT_OUTLINE_GLYPH_CLASS_GET (in PIC mode) */ |
| FT_Library library = stroker->library; |
| |
| FT_UNUSED( library ); |
| |
| |
| if ( !pglyph ) |
| goto Exit; |
| |
| glyph = *pglyph; |
| if ( !glyph || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET ) |
| goto Exit; |
| |
| { |
| FT_Glyph copy; |
| |
| |
| error = FT_Glyph_Copy( glyph, © ); |
| if ( error ) |
| goto Exit; |
| |
| glyph = copy; |
| } |
| |
| { |
| FT_OutlineGlyph oglyph = (FT_OutlineGlyph)glyph; |
| FT_StrokerBorder border; |
| FT_Outline* outline = &oglyph->outline; |
| FT_UInt num_points, num_contours; |
| |
| |
| border = FT_Outline_GetOutsideBorder( outline ); |
| if ( inside ) |
| { |
| if ( border == FT_STROKER_BORDER_LEFT ) |
| border = FT_STROKER_BORDER_RIGHT; |
| else |
| border = FT_STROKER_BORDER_LEFT; |
| } |
| |
| error = FT_Stroker_ParseOutline( stroker, outline, FALSE ); |
| if ( error ) |
| goto Fail; |
| |
| FT_Stroker_GetBorderCounts( stroker, border, |
| &num_points, &num_contours ); |
| |
| FT_Outline_Done( glyph->library, outline ); |
| |
| error = FT_Outline_New( glyph->library, |
| num_points, |
| (FT_Int)num_contours, |
| outline ); |
| if ( error ) |
| goto Fail; |
| |
| outline->n_points = 0; |
| outline->n_contours = 0; |
| |
| FT_Stroker_ExportBorder( stroker, border, outline ); |
| } |
| |
| if ( destroy ) |
| FT_Done_Glyph( *pglyph ); |
| |
| *pglyph = glyph; |
| goto Exit; |
| |
| Fail: |
| FT_Done_Glyph( glyph ); |
| glyph = NULL; |
| |
| if ( !destroy ) |
| *pglyph = NULL; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* END */ |
