-/***************************************************************************/
-/* */
-/* ftstroke.c */
-/* */
-/* FreeType path stroker (body). */
-/* */
-/* Copyright 2002, 2003, 2004, 2005, 2006 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 / 6 )
-#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 )
- *angle_in = *angle_out = 0;
- else
- *angle_in = *angle_out = FT_Atan2( d2.x, d2.y );
- }
- else 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;
- }
-
-
- 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 || close3 )
- {
- if ( close2 )
- {
- /* basically a point */
- *angle_in = *angle_out = *angle_mid = 0;
- }
- else if ( close1 )
- {
- *angle_in = *angle_mid = FT_Atan2( d2.x, d2.y );
- *angle_out = FT_Atan2( d3.x, d3.y );
- }
- else /* close2 */
- {
- *angle_in = FT_Atan2( d1.x, d1.y );
- *angle_mid = *angle_out = FT_Atan2( d2.x, d2.y );
- }
- }
- else if ( close2 )
- {
- *angle_in = *angle_mid = FT_Atan2( d1.x, d1.y );
- *angle_out = FT_Atan2( d3.x, d3.y );
- }
- else
- {
- *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_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;
- 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 = 0;
-
-
- 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 = 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 = 0;
- }
-
-
- static FT_Error
- ft_stroke_border_lineto( FT_StrokeBorder border,
- FT_Vector* to,
- FT_Bool movable )
- {
- FT_Error error = 0;
-
-
- FT_ASSERT( border->start >= 0 );
-
- if ( border->movable )
- {
- /* move last point */
- border->points[border->num_points - 1] = *to;
- }
- else
- {
- /* 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 = 0;
- 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 = 0;
- 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 = 0;
-
-
- /* 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, 0 );
-
- border->start = border->num_points;
- border->movable = 0;
-
- return ft_stroke_border_lineto( border, to, 0 );
- }
-
-
- 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 = 0;
- }
-
-
- static void
- ft_stroke_border_reset( FT_StrokeBorder border )
- {
- border->num_points = 0;
- border->start = -1;
- border->valid = 0;
- }
-
-
- 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 = 0;
- }
-
-
- static FT_Error
- ft_stroke_border_get_counts( FT_StrokeBorder border,
- FT_UInt *anum_points,
- FT_UInt *anum_contours )
- {
- FT_Error error = 0;
- 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 )
- {
- if ( in_contour == 0 )
- goto Fail;
-
- in_contour = 0;
- num_contours++;
- }
- }
-
- if ( in_contour != 0 )
- goto Fail;
-
- border->valid = 1;
-
- 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)( outline->n_points + 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;
- FT_Angle angle_out;
- FT_Vector center;
- FT_Bool first_point;
- FT_Bool subpath_open;
- FT_Angle subpath_angle;
- FT_Vector subpath_start;
-
- FT_Stroker_LineCap line_cap;
- FT_Stroker_LineJoin line_join;
- FT_Fixed miter_limit;
- FT_Fixed radius;
-
- FT_Bool valid;
- FT_StrokeBorderRec borders[2];
- FT_Memory memory;
-
- } FT_StrokerRec;
-
-
- /* documentation is in ftstroke.h */
-
- FT_EXPORT_DEF( FT_Error )
- FT_Stroker_New( FT_Library library,
- FT_Stroker *astroker )
- {
- FT_Error error;
- FT_Memory memory;
- FT_Stroker stroker;
-
-
- if ( !library )
- return FT_Err_Invalid_Argument;
-
- memory = library->memory;
-
- if ( !FT_NEW( stroker ) )
- {
- stroker->memory = memory;
-
- 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 )
- {
- stroker->radius = radius;
- stroker->line_cap = line_cap;
- stroker->line_join = line_join;
- stroker->miter_limit = miter_limit;
-
- 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->memory;
-
-
- ft_stroke_border_done( &stroker->borders[0] );
- ft_stroke_border_done( &stroker->borders[1] );
-
- stroker->memory = NULL;
- FT_FREE( stroker );
- }
- }
-
-
- /* creates 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 = 0;
- 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 = 0;
- return error;
- }
-
-
- /* adds 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 = 0;
-
-
- 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, 0 );
- 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, 0 );
- }
-
- Exit:
- return error;
- }
-
-
- /* process an inside corner, i.e. compute intersection */
- static FT_Error
- ft_stroker_inside( FT_Stroker stroker,
- FT_Int side)
- {
- FT_StrokeBorder border = stroker->borders + side;
- FT_Angle phi, theta, rotate;
- FT_Fixed length, thcos, sigma;
- FT_Vector delta;
- FT_Error error = 0;
-
-
- rotate = FT_SIDE_TO_ROTATE( side );
-
- /* compute median angle */
- theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
- if ( theta == FT_ANGLE_PI )
- theta = rotate;
- else
- theta = theta / 2;
-
- phi = stroker->angle_in + theta;
-
- thcos = FT_Cos( theta );
- sigma = FT_MulFix( stroker->miter_limit, thcos );
-
- /* TODO: find better criterion to switch off the optimization */
- if ( sigma < 0x10000L )
- {
- FT_Vector_From_Polar( &delta, stroker->radius,
- stroker->angle_out + rotate );
- delta.x += stroker->center.x;
- delta.y += stroker->center.y;
- border->movable = 0;
- }
- else
- {
- 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, 0 );
-
- 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_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 or beveled corner */
- FT_Fixed sigma, radius = stroker->radius;
- FT_Angle theta, phi;
- FT_Fixed thcos;
- FT_Bool miter;
-
-
- rotate = FT_SIDE_TO_ROTATE( side );
- miter = FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_MITER );
-
- theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
- if ( theta == FT_ANGLE_PI )
- {
- theta = rotate;
- phi = stroker->angle_in;
- }
- else
- {
- theta = theta / 2;
- phi = stroker->angle_in + theta + rotate;
- }
-
- thcos = FT_Cos( theta );
- sigma = FT_MulFix( stroker->miter_limit, thcos );
-
- if ( sigma >= 0x10000L )
- miter = 0;
-
- if ( miter ) /* this is a miter (broken angle) */
- {
- 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_MulFix( radius,
- FT_DivFix( 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, 0 );
- 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, 0 );
- if ( error )
- goto Exit;
-
- /* finally, add a movable end point */
- 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, 1 );
- }
-
- else /* this is a bevel (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, 0 );
- if (error) goto Exit;
-
- /* now add end point */
- 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, 1 );
- }
- }
-
- Exit:
- return error;
- }
-
-
- static FT_Error
- ft_stroker_process_corner( FT_Stroker stroker )
- {
- FT_Error error = 0;
- 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 */
- inside_side = 0;
-
- /* otherwise, the inside side is 1 */
- if ( turn < 0 )
- inside_side = 1;
-
- /* process the inside side */
- error = ft_stroker_inside( stroker, inside_side );
- if ( error )
- goto Exit;
-
- /* process the outside side */
- error = ft_stroker_outside( stroker, 1 - inside_side );
-
- 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_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 for last cap */
- stroker->subpath_angle = start_angle;
- stroker->first_point = 0;
-
- 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 = 0;
- FT_StrokeBorder border;
- FT_Vector delta;
- FT_Angle angle;
- FT_Int side;
-
- delta.x = to->x - stroker->center.x;
- delta.y = to->y - stroker->center.y;
-
- 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 );
- if ( error )
- goto Exit;
- }
- else
- {
- /* process the current corner */
- stroker->angle_out = angle;
- error = ft_stroker_process_corner( stroker );
- 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;
-
- error = ft_stroke_border_lineto( border, &point, 1 );
- if ( error )
- goto Exit;
-
- delta.x = -delta.x;
- delta.y = -delta.y;
- }
-
- stroker->angle_in = angle;
- stroker->center = *to;
-
- 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 = 0;
- FT_Vector bez_stack[34];
- FT_Vector* arc;
- FT_Vector* limit = bez_stack + 30;
- FT_Angle start_angle;
- FT_Bool first_arc = 1;
-
-
- arc = bez_stack;
- arc[0] = *to;
- arc[1] = *control;
- arc[2] = stroker->center;
-
- while ( arc >= bez_stack )
- {
- FT_Angle angle_in, angle_out;
-
-
- angle_in = angle_out = 0; /* remove compiler warnings */
-
- if ( arc < limit &&
- !ft_conic_is_small_enough( arc, &angle_in, &angle_out ) )
- {
- ft_conic_split( arc );
- arc += 2;
- continue;
- }
-
- if ( first_arc )
- {
- first_arc = 0;
-
- start_angle = angle_in;
-
- /* process corner if necessary */
- if ( stroker->first_point )
- error = ft_stroker_subpath_start( stroker, start_angle );
- else
- {
- stroker->angle_out = start_angle;
- error = ft_stroker_process_corner( stroker );
- }
- }
-
- /* the arc's angle is small enough; we can add it directly to each */
- /* border */
- {
- FT_Vector ctrl, end;
- FT_Angle theta, phi, rotate;
- FT_Fixed length;
- FT_Int side;
-
-
- theta = FT_Angle_Diff( angle_in, angle_out ) / 2;
- phi = angle_in + theta;
- length = FT_DivFix( stroker->radius, FT_Cos( theta ) );
-
- for ( side = 0; side <= 1; side++ )
- {
- 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;
-
- error = ft_stroke_border_conicto( stroker->borders + side,
- &ctrl, &end );
- if ( error )
- goto Exit;
- }
- }
-
- arc -= 2;
-
- if ( arc < bez_stack )
- 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 = 0;
- FT_Vector bez_stack[37];
- FT_Vector* arc;
- FT_Vector* limit = bez_stack + 32;
- FT_Angle start_angle;
- FT_Bool first_arc = 1;
-
-
- 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;
-
-
- /* remove compiler warnings */
- angle_in = angle_out = angle_mid = 0;
-
- if ( arc < limit &&
- !ft_cubic_is_small_enough( arc, &angle_in,
- &angle_mid, &angle_out ) )
- {
- ft_cubic_split( arc );
- arc += 3;
- continue;
- }
-
- if ( first_arc )
- {
- first_arc = 0;
-
- /* process corner if necessary */
- start_angle = angle_in;
-
- if ( stroker->first_point )
- error = ft_stroker_subpath_start( stroker, start_angle );
- else
- {
- stroker->angle_out = start_angle;
- error = ft_stroker_process_corner( stroker );
- }
- 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;
- FT_Fixed length1, length2;
- FT_Int side;
-
-
- theta1 = ft_pos_abs( angle_mid - angle_in ) / 2;
- theta2 = ft_pos_abs( angle_out - angle_mid ) / 2;
- phi1 = (angle_mid + angle_in ) / 2;
- phi2 = (angle_mid + angle_out ) / 2;
- length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) );
- length2 = FT_DivFix( stroker->radius, FT_Cos(theta2) );
-
- for ( side = 0; side <= 1; side++ )
- {
- 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;
-
- error = ft_stroke_border_cubicto( stroker->borders + side,
- &ctrl1, &ctrl2, &end );
- if ( error )
- goto Exit;
- }
- }
-
- arc -= 3;
- if ( arc < bez_stack )
- 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 )
- {
- /* We cannot process the first point, because there is not enough */
- /* information regarding its corner/cap. The latter will be processed */
- /* in the "end_subpath" routine. */
- /* */
- stroker->first_point = 1;
- stroker->center = *to;
- stroker->subpath_open = open;
-
- /* record the subpath start point index for each border */
- stroker->subpath_start = *to;
- return 0;
- }
-
-
- 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 = 0;
-
-
- FT_ASSERT( left->start >= 0 );
-
- new_points = 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 = left->start;
- right->num_points += new_points;
-
- right->movable = 0;
- left->movable = 0;
- }
-
- 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 = 0;
-
- 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, 1 );
- 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, 0 );
- }
- 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 */
- inside_side = 0;
-
- /* otherwise, the inside side is 1 */
- if ( turn < 0 )
- inside_side = 1;
-
- error = ft_stroker_inside( stroker, inside_side );
- if ( error )
- goto Exit;
-
- /* process the outside side */
- error = ft_stroker_outside( stroker, 1 - inside_side );
- if ( error )
- goto Exit;
- }
-
- /* then end our two subpaths */
- ft_stroke_border_close( stroker->borders + 0, 1 );
- ft_stroke_border_close( stroker->borders + 1, 0 );
- }
-
- 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_Err_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;
-
-
- 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:
- *anum_points = num_points;
- *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 ( 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 || !stroker )
- return FT_Err_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 = 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 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--;
- }
-
- 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;
-
- error = FT_Stroker_EndSubPath( stroker );
- if ( error )
- goto Exit;
-
- first = last + 1;
- }
-
- return 0;
-
- Exit:
- return error;
-
- Invalid_Outline:
- return FT_Err_Invalid_Outline;
- }
-
-
- extern const FT_Glyph_Class ft_outline_glyph_class;
-
-
- /* 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;
-
-
- if ( pglyph == NULL )
- goto Exit;
-
- glyph = *pglyph;
- if ( glyph == NULL || glyph->clazz != &ft_outline_glyph_class )
- 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, 0 );
- if ( error )
- goto Fail;
-
- (void)FT_Stroker_GetCounts( stroker, &num_points, &num_contours );
-
- FT_Outline_Done( glyph->library, outline );
-
- error = FT_Outline_New( glyph->library,
- num_points, 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;
-
-
- if ( pglyph == NULL )
- goto Exit;
-
- glyph = *pglyph;
- if ( glyph == NULL || glyph->clazz != &ft_outline_glyph_class )
- 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, 0 );
- if ( error )
- goto Fail;
-
- (void)FT_Stroker_GetBorderCounts( stroker, border,
- &num_points, &num_contours );
-
- FT_Outline_Done( glyph->library, outline );
-
- error = FT_Outline_New( glyph->library,
- num_points,
- 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 */
+/***************************************************************************/\r
+/* */\r
+/* ftstroke.c */\r
+/* */\r
+/* FreeType path stroker (body). */\r
+/* */\r
+/* Copyright 2002, 2003, 2004, 2005, 2006 by */\r
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */\r
+/* */\r
+/* This file is part of the FreeType project, and may only be used, */\r
+/* modified, and distributed under the terms of the FreeType project */\r
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */\r
+/* this file you indicate that you have read the license and */\r
+/* understand and accept it fully. */\r
+/* */\r
+/***************************************************************************/\r
+\r
+\r
+#include <ft2build.h>\r
+#include FT_STROKER_H\r
+#include FT_TRIGONOMETRY_H\r
+#include FT_OUTLINE_H\r
+#include FT_INTERNAL_MEMORY_H\r
+#include FT_INTERNAL_DEBUG_H\r
+#include FT_INTERNAL_OBJECTS_H\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_StrokerBorder )\r
+ FT_Outline_GetInsideBorder( FT_Outline* outline )\r
+ {\r
+ FT_Orientation o = FT_Outline_Get_Orientation( outline );\r
+\r
+\r
+ return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_RIGHT\r
+ : FT_STROKER_BORDER_LEFT ;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_StrokerBorder )\r
+ FT_Outline_GetOutsideBorder( FT_Outline* outline )\r
+ {\r
+ FT_Orientation o = FT_Outline_Get_Orientation( outline );\r
+\r
+\r
+ return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_LEFT\r
+ : FT_STROKER_BORDER_RIGHT ;\r
+ }\r
+\r
+\r
+ /***************************************************************************/\r
+ /***************************************************************************/\r
+ /***** *****/\r
+ /***** BEZIER COMPUTATIONS *****/\r
+ /***** *****/\r
+ /***************************************************************************/\r
+ /***************************************************************************/\r
+\r
+#define FT_SMALL_CONIC_THRESHOLD ( FT_ANGLE_PI / 6 )\r
+#define FT_SMALL_CUBIC_THRESHOLD ( FT_ANGLE_PI / 6 )\r
+#define FT_EPSILON 2\r
+\r
+#define FT_IS_SMALL( x ) ( (x) > -FT_EPSILON && (x) < FT_EPSILON )\r
+\r
+\r
+ static FT_Pos\r
+ ft_pos_abs( FT_Pos x )\r
+ {\r
+ return x >= 0 ? x : -x ;\r
+ }\r
+\r
+\r
+ static void\r
+ ft_conic_split( FT_Vector* base )\r
+ {\r
+ FT_Pos a, b;\r
+\r
+\r
+ base[4].x = base[2].x;\r
+ b = base[1].x;\r
+ a = base[3].x = ( base[2].x + b ) / 2;\r
+ b = base[1].x = ( base[0].x + b ) / 2;\r
+ base[2].x = ( a + b ) / 2;\r
+\r
+ base[4].y = base[2].y;\r
+ b = base[1].y;\r
+ a = base[3].y = ( base[2].y + b ) / 2;\r
+ b = base[1].y = ( base[0].y + b ) / 2;\r
+ base[2].y = ( a + b ) / 2;\r
+ }\r
+\r
+\r
+ static FT_Bool\r
+ ft_conic_is_small_enough( FT_Vector* base,\r
+ FT_Angle *angle_in,\r
+ FT_Angle *angle_out )\r
+ {\r
+ FT_Vector d1, d2;\r
+ FT_Angle theta;\r
+ FT_Int close1, close2;\r
+\r
+\r
+ d1.x = base[1].x - base[2].x;\r
+ d1.y = base[1].y - base[2].y;\r
+ d2.x = base[0].x - base[1].x;\r
+ d2.y = base[0].y - base[1].y;\r
+\r
+ close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );\r
+ close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );\r
+\r
+ if ( close1 )\r
+ {\r
+ if ( close2 )\r
+ *angle_in = *angle_out = 0;\r
+ else\r
+ *angle_in = *angle_out = FT_Atan2( d2.x, d2.y );\r
+ }\r
+ else if ( close2 )\r
+ {\r
+ *angle_in = *angle_out = FT_Atan2( d1.x, d1.y );\r
+ }\r
+ else\r
+ {\r
+ *angle_in = FT_Atan2( d1.x, d1.y );\r
+ *angle_out = FT_Atan2( d2.x, d2.y );\r
+ }\r
+\r
+ theta = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_out ) );\r
+\r
+ return FT_BOOL( theta < FT_SMALL_CONIC_THRESHOLD );\r
+ }\r
+\r
+\r
+ static void\r
+ ft_cubic_split( FT_Vector* base )\r
+ {\r
+ FT_Pos a, b, c, d;\r
+\r
+\r
+ base[6].x = base[3].x;\r
+ c = base[1].x;\r
+ d = base[2].x;\r
+ base[1].x = a = ( base[0].x + c ) / 2;\r
+ base[5].x = b = ( base[3].x + d ) / 2;\r
+ c = ( c + d ) / 2;\r
+ base[2].x = a = ( a + c ) / 2;\r
+ base[4].x = b = ( b + c ) / 2;\r
+ base[3].x = ( a + b ) / 2;\r
+\r
+ base[6].y = base[3].y;\r
+ c = base[1].y;\r
+ d = base[2].y;\r
+ base[1].y = a = ( base[0].y + c ) / 2;\r
+ base[5].y = b = ( base[3].y + d ) / 2;\r
+ c = ( c + d ) / 2;\r
+ base[2].y = a = ( a + c ) / 2;\r
+ base[4].y = b = ( b + c ) / 2;\r
+ base[3].y = ( a + b ) / 2;\r
+ }\r
+\r
+\r
+ static FT_Bool\r
+ ft_cubic_is_small_enough( FT_Vector* base,\r
+ FT_Angle *angle_in,\r
+ FT_Angle *angle_mid,\r
+ FT_Angle *angle_out )\r
+ {\r
+ FT_Vector d1, d2, d3;\r
+ FT_Angle theta1, theta2;\r
+ FT_Int close1, close2, close3;\r
+\r
+\r
+ d1.x = base[2].x - base[3].x;\r
+ d1.y = base[2].y - base[3].y;\r
+ d2.x = base[1].x - base[2].x;\r
+ d2.y = base[1].y - base[2].y;\r
+ d3.x = base[0].x - base[1].x;\r
+ d3.y = base[0].y - base[1].y;\r
+\r
+ close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );\r
+ close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );\r
+ close3 = FT_IS_SMALL( d3.x ) && FT_IS_SMALL( d3.y );\r
+\r
+ if ( close1 || close3 )\r
+ {\r
+ if ( close2 )\r
+ {\r
+ /* basically a point */\r
+ *angle_in = *angle_out = *angle_mid = 0;\r
+ }\r
+ else if ( close1 )\r
+ {\r
+ *angle_in = *angle_mid = FT_Atan2( d2.x, d2.y );\r
+ *angle_out = FT_Atan2( d3.x, d3.y );\r
+ }\r
+ else /* close2 */\r
+ {\r
+ *angle_in = FT_Atan2( d1.x, d1.y );\r
+ *angle_mid = *angle_out = FT_Atan2( d2.x, d2.y );\r
+ }\r
+ }\r
+ else if ( close2 )\r
+ {\r
+ *angle_in = *angle_mid = FT_Atan2( d1.x, d1.y );\r
+ *angle_out = FT_Atan2( d3.x, d3.y );\r
+ }\r
+ else\r
+ {\r
+ *angle_in = FT_Atan2( d1.x, d1.y );\r
+ *angle_mid = FT_Atan2( d2.x, d2.y );\r
+ *angle_out = FT_Atan2( d3.x, d3.y );\r
+ }\r
+\r
+ theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) );\r
+ theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) );\r
+\r
+ return FT_BOOL( theta1 < FT_SMALL_CUBIC_THRESHOLD &&\r
+ theta2 < FT_SMALL_CUBIC_THRESHOLD );\r
+ }\r
+\r
+\r
+ /***************************************************************************/\r
+ /***************************************************************************/\r
+ /***** *****/\r
+ /***** STROKE BORDERS *****/\r
+ /***** *****/\r
+ /***************************************************************************/\r
+ /***************************************************************************/\r
+\r
+ typedef enum\r
+ {\r
+ FT_STROKE_TAG_ON = 1, /* on-curve point */\r
+ FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */\r
+ FT_STROKE_TAG_BEGIN = 4, /* sub-path start */\r
+ FT_STROKE_TAG_END = 8 /* sub-path end */\r
+\r
+ } FT_StrokeTags;\r
+\r
+#define FT_STROKE_TAG_BEGIN_END (FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END)\r
+\r
+ typedef struct FT_StrokeBorderRec_\r
+ {\r
+ FT_UInt num_points;\r
+ FT_UInt max_points;\r
+ FT_Vector* points;\r
+ FT_Byte* tags;\r
+ FT_Bool movable;\r
+ FT_Int start; /* index of current sub-path start point */\r
+ FT_Memory memory;\r
+ FT_Bool valid;\r
+\r
+ } FT_StrokeBorderRec, *FT_StrokeBorder;\r
+\r
+\r
+ static FT_Error\r
+ ft_stroke_border_grow( FT_StrokeBorder border,\r
+ FT_UInt new_points )\r
+ {\r
+ FT_UInt old_max = border->max_points;\r
+ FT_UInt new_max = border->num_points + new_points;\r
+ FT_Error error = 0;\r
+\r
+\r
+ if ( new_max > old_max )\r
+ {\r
+ FT_UInt cur_max = old_max;\r
+ FT_Memory memory = border->memory;\r
+\r
+\r
+ while ( cur_max < new_max )\r
+ cur_max += ( cur_max >> 1 ) + 16;\r
+\r
+ if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) ||\r
+ FT_RENEW_ARRAY( border->tags, old_max, cur_max ) )\r
+ goto Exit;\r
+\r
+ border->max_points = cur_max;\r
+ }\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ static void\r
+ ft_stroke_border_close( FT_StrokeBorder border,\r
+ FT_Bool reverse )\r
+ {\r
+ FT_UInt start = border->start;\r
+ FT_UInt count = border->num_points;\r
+\r
+\r
+ FT_ASSERT( border->start >= 0 );\r
+\r
+ /* don't record empty paths! */\r
+ if ( count <= start + 1U )\r
+ border->num_points = start;\r
+ else\r
+ {\r
+ /* copy the last point to the start of this sub-path, since */\r
+ /* it contains the `adjusted' starting coordinates */\r
+ border->num_points = --count;\r
+ border->points[start] = border->points[count];\r
+\r
+ if ( reverse )\r
+ {\r
+ /* reverse the points */\r
+ {\r
+ FT_Vector* vec1 = border->points + start + 1;\r
+ FT_Vector* vec2 = border->points + count - 1;\r
+\r
+\r
+ for ( ; vec1 < vec2; vec1++, vec2-- )\r
+ {\r
+ FT_Vector tmp;\r
+\r
+\r
+ tmp = *vec1;\r
+ *vec1 = *vec2;\r
+ *vec2 = tmp;\r
+ }\r
+ }\r
+\r
+ /* then the tags */\r
+ {\r
+ FT_Byte* tag1 = border->tags + start + 1;\r
+ FT_Byte* tag2 = border->tags + count - 1;\r
+\r
+\r
+ for ( ; tag1 < tag2; tag1++, tag2-- )\r
+ {\r
+ FT_Byte tmp;\r
+\r
+\r
+ tmp = *tag1;\r
+ *tag1 = *tag2;\r
+ *tag2 = tmp;\r
+ }\r
+ }\r
+ }\r
+\r
+ border->tags[start ] |= FT_STROKE_TAG_BEGIN;\r
+ border->tags[count - 1] |= FT_STROKE_TAG_END;\r
+ }\r
+\r
+ border->start = -1;\r
+ border->movable = 0;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ ft_stroke_border_lineto( FT_StrokeBorder border,\r
+ FT_Vector* to,\r
+ FT_Bool movable )\r
+ {\r
+ FT_Error error = 0;\r
+\r
+\r
+ FT_ASSERT( border->start >= 0 );\r
+\r
+ if ( border->movable )\r
+ {\r
+ /* move last point */\r
+ border->points[border->num_points - 1] = *to;\r
+ }\r
+ else\r
+ {\r
+ /* add one point */\r
+ error = ft_stroke_border_grow( border, 1 );\r
+ if ( !error )\r
+ {\r
+ FT_Vector* vec = border->points + border->num_points;\r
+ FT_Byte* tag = border->tags + border->num_points;\r
+\r
+\r
+ vec[0] = *to;\r
+ tag[0] = FT_STROKE_TAG_ON;\r
+\r
+ border->num_points += 1;\r
+ }\r
+ }\r
+ border->movable = movable;\r
+ return error;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ ft_stroke_border_conicto( FT_StrokeBorder border,\r
+ FT_Vector* control,\r
+ FT_Vector* to )\r
+ {\r
+ FT_Error error;\r
+\r
+\r
+ FT_ASSERT( border->start >= 0 );\r
+\r
+ error = ft_stroke_border_grow( border, 2 );\r
+ if ( !error )\r
+ {\r
+ FT_Vector* vec = border->points + border->num_points;\r
+ FT_Byte* tag = border->tags + border->num_points;\r
+\r
+ vec[0] = *control;\r
+ vec[1] = *to;\r
+\r
+ tag[0] = 0;\r
+ tag[1] = FT_STROKE_TAG_ON;\r
+\r
+ border->num_points += 2;\r
+ }\r
+ border->movable = 0;\r
+ return error;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ ft_stroke_border_cubicto( FT_StrokeBorder border,\r
+ FT_Vector* control1,\r
+ FT_Vector* control2,\r
+ FT_Vector* to )\r
+ {\r
+ FT_Error error;\r
+\r
+\r
+ FT_ASSERT( border->start >= 0 );\r
+\r
+ error = ft_stroke_border_grow( border, 3 );\r
+ if ( !error )\r
+ {\r
+ FT_Vector* vec = border->points + border->num_points;\r
+ FT_Byte* tag = border->tags + border->num_points;\r
+\r
+\r
+ vec[0] = *control1;\r
+ vec[1] = *control2;\r
+ vec[2] = *to;\r
+\r
+ tag[0] = FT_STROKE_TAG_CUBIC;\r
+ tag[1] = FT_STROKE_TAG_CUBIC;\r
+ tag[2] = FT_STROKE_TAG_ON;\r
+\r
+ border->num_points += 3;\r
+ }\r
+ border->movable = 0;\r
+ return error;\r
+ }\r
+\r
+\r
+#define FT_ARC_CUBIC_ANGLE ( FT_ANGLE_PI / 2 )\r
+\r
+\r
+ static FT_Error\r
+ ft_stroke_border_arcto( FT_StrokeBorder border,\r
+ FT_Vector* center,\r
+ FT_Fixed radius,\r
+ FT_Angle angle_start,\r
+ FT_Angle angle_diff )\r
+ {\r
+ FT_Angle total, angle, step, rotate, next, theta;\r
+ FT_Vector a, b, a2, b2;\r
+ FT_Fixed length;\r
+ FT_Error error = 0;\r
+\r
+\r
+ /* compute start point */\r
+ FT_Vector_From_Polar( &a, radius, angle_start );\r
+ a.x += center->x;\r
+ a.y += center->y;\r
+\r
+ total = angle_diff;\r
+ angle = angle_start;\r
+ rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2 : -FT_ANGLE_PI2;\r
+\r
+ while ( total != 0 )\r
+ {\r
+ step = total;\r
+ if ( step > FT_ARC_CUBIC_ANGLE )\r
+ step = FT_ARC_CUBIC_ANGLE;\r
+\r
+ else if ( step < -FT_ARC_CUBIC_ANGLE )\r
+ step = -FT_ARC_CUBIC_ANGLE;\r
+\r
+ next = angle + step;\r
+ theta = step;\r
+ if ( theta < 0 )\r
+ theta = -theta;\r
+\r
+ theta >>= 1;\r
+\r
+ /* compute end point */\r
+ FT_Vector_From_Polar( &b, radius, next );\r
+ b.x += center->x;\r
+ b.y += center->y;\r
+\r
+ /* compute first and second control points */\r
+ length = FT_MulDiv( radius, FT_Sin( theta ) * 4,\r
+ ( 0x10000L + FT_Cos( theta ) ) * 3 );\r
+\r
+ FT_Vector_From_Polar( &a2, length, angle + rotate );\r
+ a2.x += a.x;\r
+ a2.y += a.y;\r
+\r
+ FT_Vector_From_Polar( &b2, length, next - rotate );\r
+ b2.x += b.x;\r
+ b2.y += b.y;\r
+\r
+ /* add cubic arc */\r
+ error = ft_stroke_border_cubicto( border, &a2, &b2, &b );\r
+ if ( error )\r
+ break;\r
+\r
+ /* process the rest of the arc ?? */\r
+ a = b;\r
+ total -= step;\r
+ angle = next;\r
+ }\r
+\r
+ return error;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ ft_stroke_border_moveto( FT_StrokeBorder border,\r
+ FT_Vector* to )\r
+ {\r
+ /* close current open path if any ? */\r
+ if ( border->start >= 0 )\r
+ ft_stroke_border_close( border, 0 );\r
+\r
+ border->start = border->num_points;\r
+ border->movable = 0;\r
+\r
+ return ft_stroke_border_lineto( border, to, 0 );\r
+ }\r
+\r
+\r
+ static void\r
+ ft_stroke_border_init( FT_StrokeBorder border,\r
+ FT_Memory memory )\r
+ {\r
+ border->memory = memory;\r
+ border->points = NULL;\r
+ border->tags = NULL;\r
+\r
+ border->num_points = 0;\r
+ border->max_points = 0;\r
+ border->start = -1;\r
+ border->valid = 0;\r
+ }\r
+\r
+\r
+ static void\r
+ ft_stroke_border_reset( FT_StrokeBorder border )\r
+ {\r
+ border->num_points = 0;\r
+ border->start = -1;\r
+ border->valid = 0;\r
+ }\r
+\r
+\r
+ static void\r
+ ft_stroke_border_done( FT_StrokeBorder border )\r
+ {\r
+ FT_Memory memory = border->memory;\r
+\r
+\r
+ FT_FREE( border->points );\r
+ FT_FREE( border->tags );\r
+\r
+ border->num_points = 0;\r
+ border->max_points = 0;\r
+ border->start = -1;\r
+ border->valid = 0;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ ft_stroke_border_get_counts( FT_StrokeBorder border,\r
+ FT_UInt *anum_points,\r
+ FT_UInt *anum_contours )\r
+ {\r
+ FT_Error error = 0;\r
+ FT_UInt num_points = 0;\r
+ FT_UInt num_contours = 0;\r
+\r
+ FT_UInt count = border->num_points;\r
+ FT_Vector* point = border->points;\r
+ FT_Byte* tags = border->tags;\r
+ FT_Int in_contour = 0;\r
+\r
+\r
+ for ( ; count > 0; count--, num_points++, point++, tags++ )\r
+ {\r
+ if ( tags[0] & FT_STROKE_TAG_BEGIN )\r
+ {\r
+ if ( in_contour != 0 )\r
+ goto Fail;\r
+\r
+ in_contour = 1;\r
+ }\r
+ else if ( in_contour == 0 )\r
+ goto Fail;\r
+\r
+ if ( tags[0] & FT_STROKE_TAG_END )\r
+ {\r
+ if ( in_contour == 0 )\r
+ goto Fail;\r
+\r
+ in_contour = 0;\r
+ num_contours++;\r
+ }\r
+ }\r
+\r
+ if ( in_contour != 0 )\r
+ goto Fail;\r
+\r
+ border->valid = 1;\r
+\r
+ Exit:\r
+ *anum_points = num_points;\r
+ *anum_contours = num_contours;\r
+ return error;\r
+\r
+ Fail:\r
+ num_points = 0;\r
+ num_contours = 0;\r
+ goto Exit;\r
+ }\r
+\r
+\r
+ static void\r
+ ft_stroke_border_export( FT_StrokeBorder border,\r
+ FT_Outline* outline )\r
+ {\r
+ /* copy point locations */\r
+ FT_ARRAY_COPY( outline->points + outline->n_points,\r
+ border->points,\r
+ border->num_points );\r
+\r
+ /* copy tags */\r
+ {\r
+ FT_UInt count = border->num_points;\r
+ FT_Byte* read = border->tags;\r
+ FT_Byte* write = (FT_Byte*)outline->tags + outline->n_points;\r
+\r
+\r
+ for ( ; count > 0; count--, read++, write++ )\r
+ {\r
+ if ( *read & FT_STROKE_TAG_ON )\r
+ *write = FT_CURVE_TAG_ON;\r
+ else if ( *read & FT_STROKE_TAG_CUBIC )\r
+ *write = FT_CURVE_TAG_CUBIC;\r
+ else\r
+ *write = FT_CURVE_TAG_CONIC;\r
+ }\r
+ }\r
+\r
+ /* copy contours */\r
+ {\r
+ FT_UInt count = border->num_points;\r
+ FT_Byte* tags = border->tags;\r
+ FT_Short* write = outline->contours + outline->n_contours;\r
+ FT_Short idx = (FT_Short)outline->n_points;\r
+\r
+\r
+ for ( ; count > 0; count--, tags++, idx++ )\r
+ {\r
+ if ( *tags & FT_STROKE_TAG_END )\r
+ {\r
+ *write++ = idx;\r
+ outline->n_contours++;\r
+ }\r
+ }\r
+ }\r
+\r
+ outline->n_points = (short)( outline->n_points + border->num_points );\r
+\r
+ FT_ASSERT( FT_Outline_Check( outline ) == 0 );\r
+ }\r
+\r
+\r
+ /***************************************************************************/\r
+ /***************************************************************************/\r
+ /***** *****/\r
+ /***** STROKER *****/\r
+ /***** *****/\r
+ /***************************************************************************/\r
+ /***************************************************************************/\r
+\r
+#define FT_SIDE_TO_ROTATE( s ) ( FT_ANGLE_PI2 - (s) * FT_ANGLE_PI )\r
+\r
+ typedef struct FT_StrokerRec_\r
+ {\r
+ FT_Angle angle_in;\r
+ FT_Angle angle_out;\r
+ FT_Vector center;\r
+ FT_Bool first_point;\r
+ FT_Bool subpath_open;\r
+ FT_Angle subpath_angle;\r
+ FT_Vector subpath_start;\r
+\r
+ FT_Stroker_LineCap line_cap;\r
+ FT_Stroker_LineJoin line_join;\r
+ FT_Fixed miter_limit;\r
+ FT_Fixed radius;\r
+\r
+ FT_Bool valid;\r
+ FT_StrokeBorderRec borders[2];\r
+ FT_Memory memory;\r
+\r
+ } FT_StrokerRec;\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_New( FT_Library library,\r
+ FT_Stroker *astroker )\r
+ {\r
+ FT_Error error;\r
+ FT_Memory memory;\r
+ FT_Stroker stroker;\r
+\r
+\r
+ if ( !library )\r
+ return FT_Err_Invalid_Argument;\r
+\r
+ memory = library->memory;\r
+\r
+ if ( !FT_NEW( stroker ) )\r
+ {\r
+ stroker->memory = memory;\r
+\r
+ ft_stroke_border_init( &stroker->borders[0], memory );\r
+ ft_stroke_border_init( &stroker->borders[1], memory );\r
+ }\r
+ *astroker = stroker;\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( void )\r
+ FT_Stroker_Set( FT_Stroker stroker,\r
+ FT_Fixed radius,\r
+ FT_Stroker_LineCap line_cap,\r
+ FT_Stroker_LineJoin line_join,\r
+ FT_Fixed miter_limit )\r
+ {\r
+ stroker->radius = radius;\r
+ stroker->line_cap = line_cap;\r
+ stroker->line_join = line_join;\r
+ stroker->miter_limit = miter_limit;\r
+\r
+ FT_Stroker_Rewind( stroker );\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( void )\r
+ FT_Stroker_Rewind( FT_Stroker stroker )\r
+ {\r
+ if ( stroker )\r
+ {\r
+ ft_stroke_border_reset( &stroker->borders[0] );\r
+ ft_stroke_border_reset( &stroker->borders[1] );\r
+ }\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( void )\r
+ FT_Stroker_Done( FT_Stroker stroker )\r
+ {\r
+ if ( stroker )\r
+ {\r
+ FT_Memory memory = stroker->memory;\r
+\r
+\r
+ ft_stroke_border_done( &stroker->borders[0] );\r
+ ft_stroke_border_done( &stroker->borders[1] );\r
+\r
+ stroker->memory = NULL;\r
+ FT_FREE( stroker );\r
+ }\r
+ }\r
+\r
+\r
+ /* creates a circular arc at a corner or cap */\r
+ static FT_Error\r
+ ft_stroker_arcto( FT_Stroker stroker,\r
+ FT_Int side )\r
+ {\r
+ FT_Angle total, rotate;\r
+ FT_Fixed radius = stroker->radius;\r
+ FT_Error error = 0;\r
+ FT_StrokeBorder border = stroker->borders + side;\r
+\r
+\r
+ rotate = FT_SIDE_TO_ROTATE( side );\r
+\r
+ total = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );\r
+ if ( total == FT_ANGLE_PI )\r
+ total = -rotate * 2;\r
+\r
+ error = ft_stroke_border_arcto( border,\r
+ &stroker->center,\r
+ radius,\r
+ stroker->angle_in + rotate,\r
+ total );\r
+ border->movable = 0;\r
+ return error;\r
+ }\r
+\r
+\r
+ /* adds a cap at the end of an opened path */\r
+ static FT_Error\r
+ ft_stroker_cap( FT_Stroker stroker,\r
+ FT_Angle angle,\r
+ FT_Int side )\r
+ {\r
+ FT_Error error = 0;\r
+\r
+\r
+ if ( stroker->line_cap == FT_STROKER_LINECAP_ROUND )\r
+ {\r
+ /* add a round cap */\r
+ stroker->angle_in = angle;\r
+ stroker->angle_out = angle + FT_ANGLE_PI;\r
+ error = ft_stroker_arcto( stroker, side );\r
+ }\r
+ else if ( stroker->line_cap == FT_STROKER_LINECAP_SQUARE )\r
+ {\r
+ /* add a square cap */\r
+ FT_Vector delta, delta2;\r
+ FT_Angle rotate = FT_SIDE_TO_ROTATE( side );\r
+ FT_Fixed radius = stroker->radius;\r
+ FT_StrokeBorder border = stroker->borders + side;\r
+\r
+\r
+ FT_Vector_From_Polar( &delta2, radius, angle + rotate );\r
+ FT_Vector_From_Polar( &delta, radius, angle );\r
+\r
+ delta.x += stroker->center.x + delta2.x;\r
+ delta.y += stroker->center.y + delta2.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 0 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ FT_Vector_From_Polar( &delta2, radius, angle - rotate );\r
+ FT_Vector_From_Polar( &delta, radius, angle );\r
+\r
+ delta.x += delta2.x + stroker->center.x;\r
+ delta.y += delta2.y + stroker->center.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 0 );\r
+ }\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* process an inside corner, i.e. compute intersection */\r
+ static FT_Error\r
+ ft_stroker_inside( FT_Stroker stroker,\r
+ FT_Int side)\r
+ {\r
+ FT_StrokeBorder border = stroker->borders + side;\r
+ FT_Angle phi, theta, rotate;\r
+ FT_Fixed length, thcos, sigma;\r
+ FT_Vector delta;\r
+ FT_Error error = 0;\r
+\r
+\r
+ rotate = FT_SIDE_TO_ROTATE( side );\r
+\r
+ /* compute median angle */\r
+ theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );\r
+ if ( theta == FT_ANGLE_PI )\r
+ theta = rotate;\r
+ else\r
+ theta = theta / 2;\r
+\r
+ phi = stroker->angle_in + theta;\r
+\r
+ thcos = FT_Cos( theta );\r
+ sigma = FT_MulFix( stroker->miter_limit, thcos );\r
+\r
+ /* TODO: find better criterion to switch off the optimization */\r
+ if ( sigma < 0x10000L )\r
+ {\r
+ FT_Vector_From_Polar( &delta, stroker->radius,\r
+ stroker->angle_out + rotate );\r
+ delta.x += stroker->center.x;\r
+ delta.y += stroker->center.y;\r
+ border->movable = 0;\r
+ }\r
+ else\r
+ {\r
+ length = FT_DivFix( stroker->radius, thcos );\r
+\r
+ FT_Vector_From_Polar( &delta, length, phi + rotate );\r
+ delta.x += stroker->center.x;\r
+ delta.y += stroker->center.y;\r
+ }\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 0 );\r
+\r
+ return error;\r
+ }\r
+\r
+\r
+ /* process an outside corner, i.e. compute bevel/miter/round */\r
+ static FT_Error\r
+ ft_stroker_outside( FT_Stroker stroker,\r
+ FT_Int side )\r
+ {\r
+ FT_StrokeBorder border = stroker->borders + side;\r
+ FT_Error error;\r
+ FT_Angle rotate;\r
+\r
+\r
+ if ( stroker->line_join == FT_STROKER_LINEJOIN_ROUND )\r
+ {\r
+ error = ft_stroker_arcto( stroker, side );\r
+ }\r
+ else\r
+ {\r
+ /* this is a mitered or beveled corner */\r
+ FT_Fixed sigma, radius = stroker->radius;\r
+ FT_Angle theta, phi;\r
+ FT_Fixed thcos;\r
+ FT_Bool miter;\r
+\r
+\r
+ rotate = FT_SIDE_TO_ROTATE( side );\r
+ miter = FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_MITER );\r
+\r
+ theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );\r
+ if ( theta == FT_ANGLE_PI )\r
+ {\r
+ theta = rotate;\r
+ phi = stroker->angle_in;\r
+ }\r
+ else\r
+ {\r
+ theta = theta / 2;\r
+ phi = stroker->angle_in + theta + rotate;\r
+ }\r
+\r
+ thcos = FT_Cos( theta );\r
+ sigma = FT_MulFix( stroker->miter_limit, thcos );\r
+\r
+ if ( sigma >= 0x10000L )\r
+ miter = 0;\r
+\r
+ if ( miter ) /* this is a miter (broken angle) */\r
+ {\r
+ FT_Vector middle, delta;\r
+ FT_Fixed length;\r
+\r
+\r
+ /* compute middle point */\r
+ FT_Vector_From_Polar( &middle,\r
+ FT_MulFix( radius, stroker->miter_limit ),\r
+ phi );\r
+ middle.x += stroker->center.x;\r
+ middle.y += stroker->center.y;\r
+\r
+ /* compute first angle point */\r
+ length = FT_MulFix( radius,\r
+ FT_DivFix( 0x10000L - sigma,\r
+ ft_pos_abs( FT_Sin( theta ) ) ) );\r
+\r
+ FT_Vector_From_Polar( &delta, length, phi + rotate );\r
+ delta.x += middle.x;\r
+ delta.y += middle.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 0 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* compute second angle point */\r
+ FT_Vector_From_Polar( &delta, length, phi - rotate );\r
+ delta.x += middle.x;\r
+ delta.y += middle.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 0 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* finally, add a movable end point */\r
+ FT_Vector_From_Polar( &delta, radius, stroker->angle_out + rotate );\r
+ delta.x += stroker->center.x;\r
+ delta.y += stroker->center.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 1 );\r
+ }\r
+\r
+ else /* this is a bevel (intersection) */\r
+ {\r
+ FT_Fixed length;\r
+ FT_Vector delta;\r
+\r
+\r
+ length = FT_DivFix( stroker->radius, thcos );\r
+\r
+ FT_Vector_From_Polar( &delta, length, phi );\r
+ delta.x += stroker->center.x;\r
+ delta.y += stroker->center.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 0 );\r
+ if (error) goto Exit;\r
+\r
+ /* now add end point */\r
+ FT_Vector_From_Polar( &delta, stroker->radius,\r
+ stroker->angle_out + rotate );\r
+ delta.x += stroker->center.x;\r
+ delta.y += stroker->center.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &delta, 1 );\r
+ }\r
+ }\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ ft_stroker_process_corner( FT_Stroker stroker )\r
+ {\r
+ FT_Error error = 0;\r
+ FT_Angle turn;\r
+ FT_Int inside_side;\r
+\r
+\r
+ turn = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );\r
+\r
+ /* no specific corner processing is required if the turn is 0 */\r
+ if ( turn == 0 )\r
+ goto Exit;\r
+\r
+ /* when we turn to the right, the inside side is 0 */\r
+ inside_side = 0;\r
+\r
+ /* otherwise, the inside side is 1 */\r
+ if ( turn < 0 )\r
+ inside_side = 1;\r
+\r
+ /* process the inside side */\r
+ error = ft_stroker_inside( stroker, inside_side );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* process the outside side */\r
+ error = ft_stroker_outside( stroker, 1 - inside_side );\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* add two points to the left and right borders corresponding to the */\r
+ /* start of the subpath.. */\r
+ static FT_Error\r
+ ft_stroker_subpath_start( FT_Stroker stroker,\r
+ FT_Angle start_angle )\r
+ {\r
+ FT_Vector delta;\r
+ FT_Vector point;\r
+ FT_Error error;\r
+ FT_StrokeBorder border;\r
+\r
+\r
+ FT_Vector_From_Polar( &delta, stroker->radius,\r
+ start_angle + FT_ANGLE_PI2 );\r
+\r
+ point.x = stroker->center.x + delta.x;\r
+ point.y = stroker->center.y + delta.y;\r
+\r
+ border = stroker->borders;\r
+ error = ft_stroke_border_moveto( border, &point );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ point.x = stroker->center.x - delta.x;\r
+ point.y = stroker->center.y - delta.y;\r
+\r
+ border++;\r
+ error = ft_stroke_border_moveto( border, &point );\r
+\r
+ /* save angle for last cap */\r
+ stroker->subpath_angle = start_angle;\r
+ stroker->first_point = 0;\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_LineTo( FT_Stroker stroker,\r
+ FT_Vector* to )\r
+ {\r
+ FT_Error error = 0;\r
+ FT_StrokeBorder border;\r
+ FT_Vector delta;\r
+ FT_Angle angle;\r
+ FT_Int side;\r
+\r
+ delta.x = to->x - stroker->center.x;\r
+ delta.y = to->y - stroker->center.y;\r
+\r
+ angle = FT_Atan2( delta.x, delta.y );\r
+ FT_Vector_From_Polar( &delta, stroker->radius, angle + FT_ANGLE_PI2 );\r
+\r
+ /* process corner if necessary */\r
+ if ( stroker->first_point )\r
+ {\r
+ /* This is the first segment of a subpath. We need to */\r
+ /* add a point to each border at their respective starting */\r
+ /* point locations. */\r
+ error = ft_stroker_subpath_start( stroker, angle );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+ else\r
+ {\r
+ /* process the current corner */\r
+ stroker->angle_out = angle;\r
+ error = ft_stroker_process_corner( stroker );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+\r
+ /* now add a line segment to both the "inside" and "outside" paths */\r
+\r
+ for ( border = stroker->borders, side = 1; side >= 0; side--, border++ )\r
+ {\r
+ FT_Vector point;\r
+\r
+\r
+ point.x = to->x + delta.x;\r
+ point.y = to->y + delta.y;\r
+\r
+ error = ft_stroke_border_lineto( border, &point, 1 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ delta.x = -delta.x;\r
+ delta.y = -delta.y;\r
+ }\r
+\r
+ stroker->angle_in = angle;\r
+ stroker->center = *to;\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_ConicTo( FT_Stroker stroker,\r
+ FT_Vector* control,\r
+ FT_Vector* to )\r
+ {\r
+ FT_Error error = 0;\r
+ FT_Vector bez_stack[34];\r
+ FT_Vector* arc;\r
+ FT_Vector* limit = bez_stack + 30;\r
+ FT_Angle start_angle;\r
+ FT_Bool first_arc = 1;\r
+\r
+\r
+ arc = bez_stack;\r
+ arc[0] = *to;\r
+ arc[1] = *control;\r
+ arc[2] = stroker->center;\r
+\r
+ while ( arc >= bez_stack )\r
+ {\r
+ FT_Angle angle_in, angle_out;\r
+\r
+\r
+ angle_in = angle_out = 0; /* remove compiler warnings */\r
+\r
+ if ( arc < limit &&\r
+ !ft_conic_is_small_enough( arc, &angle_in, &angle_out ) )\r
+ {\r
+ ft_conic_split( arc );\r
+ arc += 2;\r
+ continue;\r
+ }\r
+\r
+ if ( first_arc )\r
+ {\r
+ first_arc = 0;\r
+\r
+ start_angle = angle_in;\r
+\r
+ /* process corner if necessary */\r
+ if ( stroker->first_point )\r
+ error = ft_stroker_subpath_start( stroker, start_angle );\r
+ else\r
+ {\r
+ stroker->angle_out = start_angle;\r
+ error = ft_stroker_process_corner( stroker );\r
+ }\r
+ }\r
+\r
+ /* the arc's angle is small enough; we can add it directly to each */\r
+ /* border */\r
+ {\r
+ FT_Vector ctrl, end;\r
+ FT_Angle theta, phi, rotate;\r
+ FT_Fixed length;\r
+ FT_Int side;\r
+\r
+\r
+ theta = FT_Angle_Diff( angle_in, angle_out ) / 2;\r
+ phi = angle_in + theta;\r
+ length = FT_DivFix( stroker->radius, FT_Cos( theta ) );\r
+\r
+ for ( side = 0; side <= 1; side++ )\r
+ {\r
+ rotate = FT_SIDE_TO_ROTATE( side );\r
+\r
+ /* compute control point */\r
+ FT_Vector_From_Polar( &ctrl, length, phi + rotate );\r
+ ctrl.x += arc[1].x;\r
+ ctrl.y += arc[1].y;\r
+\r
+ /* compute end point */\r
+ FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );\r
+ end.x += arc[0].x;\r
+ end.y += arc[0].y;\r
+\r
+ error = ft_stroke_border_conicto( stroker->borders + side,\r
+ &ctrl, &end );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+ }\r
+\r
+ arc -= 2;\r
+\r
+ if ( arc < bez_stack )\r
+ stroker->angle_in = angle_out;\r
+ }\r
+\r
+ stroker->center = *to;\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_CubicTo( FT_Stroker stroker,\r
+ FT_Vector* control1,\r
+ FT_Vector* control2,\r
+ FT_Vector* to )\r
+ {\r
+ FT_Error error = 0;\r
+ FT_Vector bez_stack[37];\r
+ FT_Vector* arc;\r
+ FT_Vector* limit = bez_stack + 32;\r
+ FT_Angle start_angle;\r
+ FT_Bool first_arc = 1;\r
+\r
+\r
+ arc = bez_stack;\r
+ arc[0] = *to;\r
+ arc[1] = *control2;\r
+ arc[2] = *control1;\r
+ arc[3] = stroker->center;\r
+\r
+ while ( arc >= bez_stack )\r
+ {\r
+ FT_Angle angle_in, angle_mid, angle_out;\r
+\r
+\r
+ /* remove compiler warnings */\r
+ angle_in = angle_out = angle_mid = 0;\r
+\r
+ if ( arc < limit &&\r
+ !ft_cubic_is_small_enough( arc, &angle_in,\r
+ &angle_mid, &angle_out ) )\r
+ {\r
+ ft_cubic_split( arc );\r
+ arc += 3;\r
+ continue;\r
+ }\r
+\r
+ if ( first_arc )\r
+ {\r
+ first_arc = 0;\r
+\r
+ /* process corner if necessary */\r
+ start_angle = angle_in;\r
+\r
+ if ( stroker->first_point )\r
+ error = ft_stroker_subpath_start( stroker, start_angle );\r
+ else\r
+ {\r
+ stroker->angle_out = start_angle;\r
+ error = ft_stroker_process_corner( stroker );\r
+ }\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+\r
+ /* the arc's angle is small enough; we can add it directly to each */\r
+ /* border */\r
+ {\r
+ FT_Vector ctrl1, ctrl2, end;\r
+ FT_Angle theta1, phi1, theta2, phi2, rotate;\r
+ FT_Fixed length1, length2;\r
+ FT_Int side;\r
+\r
+\r
+ theta1 = ft_pos_abs( angle_mid - angle_in ) / 2;\r
+ theta2 = ft_pos_abs( angle_out - angle_mid ) / 2;\r
+ phi1 = (angle_mid + angle_in ) / 2;\r
+ phi2 = (angle_mid + angle_out ) / 2;\r
+ length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) );\r
+ length2 = FT_DivFix( stroker->radius, FT_Cos(theta2) );\r
+\r
+ for ( side = 0; side <= 1; side++ )\r
+ {\r
+ rotate = FT_SIDE_TO_ROTATE( side );\r
+\r
+ /* compute control points */\r
+ FT_Vector_From_Polar( &ctrl1, length1, phi1 + rotate );\r
+ ctrl1.x += arc[2].x;\r
+ ctrl1.y += arc[2].y;\r
+\r
+ FT_Vector_From_Polar( &ctrl2, length2, phi2 + rotate );\r
+ ctrl2.x += arc[1].x;\r
+ ctrl2.y += arc[1].y;\r
+\r
+ /* compute end point */\r
+ FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );\r
+ end.x += arc[0].x;\r
+ end.y += arc[0].y;\r
+\r
+ error = ft_stroke_border_cubicto( stroker->borders + side,\r
+ &ctrl1, &ctrl2, &end );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+ }\r
+\r
+ arc -= 3;\r
+ if ( arc < bez_stack )\r
+ stroker->angle_in = angle_out;\r
+ }\r
+\r
+ stroker->center = *to;\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_BeginSubPath( FT_Stroker stroker,\r
+ FT_Vector* to,\r
+ FT_Bool open )\r
+ {\r
+ /* We cannot process the first point, because there is not enough */\r
+ /* information regarding its corner/cap. The latter will be processed */\r
+ /* in the "end_subpath" routine. */\r
+ /* */\r
+ stroker->first_point = 1;\r
+ stroker->center = *to;\r
+ stroker->subpath_open = open;\r
+\r
+ /* record the subpath start point index for each border */\r
+ stroker->subpath_start = *to;\r
+ return 0;\r
+ }\r
+\r
+\r
+ static FT_Error\r
+ ft_stroker_add_reverse_left( FT_Stroker stroker,\r
+ FT_Bool open )\r
+ {\r
+ FT_StrokeBorder right = stroker->borders + 0;\r
+ FT_StrokeBorder left = stroker->borders + 1;\r
+ FT_Int new_points;\r
+ FT_Error error = 0;\r
+\r
+\r
+ FT_ASSERT( left->start >= 0 );\r
+\r
+ new_points = left->num_points - left->start;\r
+ if ( new_points > 0 )\r
+ {\r
+ error = ft_stroke_border_grow( right, (FT_UInt)new_points );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ {\r
+ FT_Vector* dst_point = right->points + right->num_points;\r
+ FT_Byte* dst_tag = right->tags + right->num_points;\r
+ FT_Vector* src_point = left->points + left->num_points - 1;\r
+ FT_Byte* src_tag = left->tags + left->num_points - 1;\r
+\r
+ while ( src_point >= left->points + left->start )\r
+ {\r
+ *dst_point = *src_point;\r
+ *dst_tag = *src_tag;\r
+\r
+ if ( open )\r
+ dst_tag[0] &= ~FT_STROKE_TAG_BEGIN_END;\r
+ else\r
+ {\r
+ FT_Byte ttag = (FT_Byte)( dst_tag[0] & FT_STROKE_TAG_BEGIN_END );\r
+\r
+\r
+ /* switch begin/end tags if necessary */\r
+ if ( ttag == FT_STROKE_TAG_BEGIN ||\r
+ ttag == FT_STROKE_TAG_END )\r
+ dst_tag[0] ^= FT_STROKE_TAG_BEGIN_END;\r
+\r
+ }\r
+\r
+ src_point--;\r
+ src_tag--;\r
+ dst_point++;\r
+ dst_tag++;\r
+ }\r
+ }\r
+\r
+ left->num_points = left->start;\r
+ right->num_points += new_points;\r
+\r
+ right->movable = 0;\r
+ left->movable = 0;\r
+ }\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ /* there's a lot of magic in this function! */\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_EndSubPath( FT_Stroker stroker )\r
+ {\r
+ FT_Error error = 0;\r
+\r
+ if ( stroker->subpath_open )\r
+ {\r
+ FT_StrokeBorder right = stroker->borders;\r
+\r
+ /* All right, this is an opened path, we need to add a cap between */\r
+ /* right & left, add the reverse of left, then add a final cap */\r
+ /* between left & right. */\r
+ error = ft_stroker_cap( stroker, stroker->angle_in, 0 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* add reversed points from "left" to "right" */\r
+ error = ft_stroker_add_reverse_left( stroker, 1 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* now add the final cap */\r
+ stroker->center = stroker->subpath_start;\r
+ error = ft_stroker_cap( stroker,\r
+ stroker->subpath_angle + FT_ANGLE_PI, 0 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* Now end the right subpath accordingly. The left one is */\r
+ /* rewind and doesn't need further processing. */\r
+ ft_stroke_border_close( right, 0 );\r
+ }\r
+ else\r
+ {\r
+ FT_Angle turn;\r
+ FT_Int inside_side;\r
+\r
+ /* close the path if needed */\r
+ if ( stroker->center.x != stroker->subpath_start.x ||\r
+ stroker->center.y != stroker->subpath_start.y )\r
+ {\r
+ error = FT_Stroker_LineTo( stroker, &stroker->subpath_start );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+\r
+ /* process the corner */\r
+ stroker->angle_out = stroker->subpath_angle;\r
+ turn = FT_Angle_Diff( stroker->angle_in,\r
+ stroker->angle_out );\r
+\r
+ /* no specific corner processing is required if the turn is 0 */\r
+ if ( turn != 0 )\r
+ {\r
+ /* when we turn to the right, the inside side is 0 */\r
+ inside_side = 0;\r
+\r
+ /* otherwise, the inside side is 1 */\r
+ if ( turn < 0 )\r
+ inside_side = 1;\r
+\r
+ error = ft_stroker_inside( stroker, inside_side );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ /* process the outside side */\r
+ error = ft_stroker_outside( stroker, 1 - inside_side );\r
+ if ( error )\r
+ goto Exit;\r
+ }\r
+\r
+ /* then end our two subpaths */\r
+ ft_stroke_border_close( stroker->borders + 0, 1 );\r
+ ft_stroke_border_close( stroker->borders + 1, 0 );\r
+ }\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_GetBorderCounts( FT_Stroker stroker,\r
+ FT_StrokerBorder border,\r
+ FT_UInt *anum_points,\r
+ FT_UInt *anum_contours )\r
+ {\r
+ FT_UInt num_points = 0, num_contours = 0;\r
+ FT_Error error;\r
+\r
+\r
+ if ( !stroker || border > 1 )\r
+ {\r
+ error = FT_Err_Invalid_Argument;\r
+ goto Exit;\r
+ }\r
+\r
+ error = ft_stroke_border_get_counts( stroker->borders + border,\r
+ &num_points, &num_contours );\r
+ Exit:\r
+ if ( anum_points )\r
+ *anum_points = num_points;\r
+\r
+ if ( anum_contours )\r
+ *anum_contours = num_contours;\r
+\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_GetCounts( FT_Stroker stroker,\r
+ FT_UInt *anum_points,\r
+ FT_UInt *anum_contours )\r
+ {\r
+ FT_UInt count1, count2, num_points = 0;\r
+ FT_UInt count3, count4, num_contours = 0;\r
+ FT_Error error;\r
+\r
+\r
+ error = ft_stroke_border_get_counts( stroker->borders + 0,\r
+ &count1, &count2 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ error = ft_stroke_border_get_counts( stroker->borders + 1,\r
+ &count3, &count4 );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ num_points = count1 + count3;\r
+ num_contours = count2 + count4;\r
+\r
+ Exit:\r
+ *anum_points = num_points;\r
+ *anum_contours = num_contours;\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( void )\r
+ FT_Stroker_ExportBorder( FT_Stroker stroker,\r
+ FT_StrokerBorder border,\r
+ FT_Outline* outline )\r
+ {\r
+ if ( border == FT_STROKER_BORDER_LEFT ||\r
+ border == FT_STROKER_BORDER_RIGHT )\r
+ {\r
+ FT_StrokeBorder sborder = & stroker->borders[border];\r
+\r
+\r
+ if ( sborder->valid )\r
+ ft_stroke_border_export( sborder, outline );\r
+ }\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( void )\r
+ FT_Stroker_Export( FT_Stroker stroker,\r
+ FT_Outline* outline )\r
+ {\r
+ FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_LEFT, outline );\r
+ FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_RIGHT, outline );\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ /*\r
+ * The following is very similar to FT_Outline_Decompose, except\r
+ * that we do support opened paths, and do not scale the outline.\r
+ */\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Stroker_ParseOutline( FT_Stroker stroker,\r
+ FT_Outline* outline,\r
+ FT_Bool opened )\r
+ {\r
+ FT_Vector v_last;\r
+ FT_Vector v_control;\r
+ FT_Vector v_start;\r
+\r
+ FT_Vector* point;\r
+ FT_Vector* limit;\r
+ char* tags;\r
+\r
+ FT_Error error;\r
+\r
+ FT_Int n; /* index of contour in outline */\r
+ FT_UInt first; /* index of first point in contour */\r
+ FT_Int tag; /* current point's state */\r
+\r
+\r
+ if ( !outline || !stroker )\r
+ return FT_Err_Invalid_Argument;\r
+\r
+ FT_Stroker_Rewind( stroker );\r
+\r
+ first = 0;\r
+\r
+ for ( n = 0; n < outline->n_contours; n++ )\r
+ {\r
+ FT_UInt last; /* index of last point in contour */\r
+\r
+\r
+ last = outline->contours[n];\r
+ limit = outline->points + last;\r
+\r
+ /* skip empty points; we don't stroke these */\r
+ if ( last <= first )\r
+ {\r
+ first = last + 1;\r
+ continue;\r
+ }\r
+\r
+ v_start = outline->points[first];\r
+ v_last = outline->points[last];\r
+\r
+ v_control = v_start;\r
+\r
+ point = outline->points + first;\r
+ tags = outline->tags + first;\r
+ tag = FT_CURVE_TAG( tags[0] );\r
+\r
+ /* A contour cannot start with a cubic control point! */\r
+ if ( tag == FT_CURVE_TAG_CUBIC )\r
+ goto Invalid_Outline;\r
+\r
+ /* check first point to determine origin */\r
+ if ( tag == FT_CURVE_TAG_CONIC )\r
+ {\r
+ /* First point is conic control. Yes, this happens. */\r
+ if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )\r
+ {\r
+ /* start at last point if it is on the curve */\r
+ v_start = v_last;\r
+ limit--;\r
+ }\r
+ else\r
+ {\r
+ /* if both first and last points are conic, */\r
+ /* start at their middle and record its position */\r
+ /* for closure */\r
+ v_start.x = ( v_start.x + v_last.x ) / 2;\r
+ v_start.y = ( v_start.y + v_last.y ) / 2;\r
+\r
+ v_last = v_start;\r
+ }\r
+ point--;\r
+ tags--;\r
+ }\r
+\r
+ error = FT_Stroker_BeginSubPath( stroker, &v_start, opened );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ while ( point < limit )\r
+ {\r
+ point++;\r
+ tags++;\r
+\r
+ tag = FT_CURVE_TAG( tags[0] );\r
+ switch ( tag )\r
+ {\r
+ case FT_CURVE_TAG_ON: /* emit a single line_to */\r
+ {\r
+ FT_Vector vec;\r
+\r
+\r
+ vec.x = point->x;\r
+ vec.y = point->y;\r
+\r
+ error = FT_Stroker_LineTo( stroker, &vec );\r
+ if ( error )\r
+ goto Exit;\r
+ continue;\r
+ }\r
+\r
+ case FT_CURVE_TAG_CONIC: /* consume conic arcs */\r
+ v_control.x = point->x;\r
+ v_control.y = point->y;\r
+\r
+ Do_Conic:\r
+ if ( point < limit )\r
+ {\r
+ FT_Vector vec;\r
+ FT_Vector v_middle;\r
+\r
+\r
+ point++;\r
+ tags++;\r
+ tag = FT_CURVE_TAG( tags[0] );\r
+\r
+ vec = point[0];\r
+\r
+ if ( tag == FT_CURVE_TAG_ON )\r
+ {\r
+ error = FT_Stroker_ConicTo( stroker, &v_control, &vec );\r
+ if ( error )\r
+ goto Exit;\r
+ continue;\r
+ }\r
+\r
+ if ( tag != FT_CURVE_TAG_CONIC )\r
+ goto Invalid_Outline;\r
+\r
+ v_middle.x = ( v_control.x + vec.x ) / 2;\r
+ v_middle.y = ( v_control.y + vec.y ) / 2;\r
+\r
+ error = FT_Stroker_ConicTo( stroker, &v_control, &v_middle );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ v_control = vec;\r
+ goto Do_Conic;\r
+ }\r
+\r
+ error = FT_Stroker_ConicTo( stroker, &v_control, &v_start );\r
+ goto Close;\r
+\r
+ default: /* FT_CURVE_TAG_CUBIC */\r
+ {\r
+ FT_Vector vec1, vec2;\r
+\r
+\r
+ if ( point + 1 > limit ||\r
+ FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )\r
+ goto Invalid_Outline;\r
+\r
+ point += 2;\r
+ tags += 2;\r
+\r
+ vec1 = point[-2];\r
+ vec2 = point[-1];\r
+\r
+ if ( point <= limit )\r
+ {\r
+ FT_Vector vec;\r
+\r
+\r
+ vec = point[0];\r
+\r
+ error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &vec );\r
+ if ( error )\r
+ goto Exit;\r
+ continue;\r
+ }\r
+\r
+ error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &v_start );\r
+ goto Close;\r
+ }\r
+ }\r
+ }\r
+\r
+ Close:\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ error = FT_Stroker_EndSubPath( stroker );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ first = last + 1;\r
+ }\r
+\r
+ return 0;\r
+\r
+ Exit:\r
+ return error;\r
+\r
+ Invalid_Outline:\r
+ return FT_Err_Invalid_Outline;\r
+ }\r
+\r
+\r
+ extern const FT_Glyph_Class ft_outline_glyph_class;\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Glyph_Stroke( FT_Glyph *pglyph,\r
+ FT_Stroker stroker,\r
+ FT_Bool destroy )\r
+ {\r
+ FT_Error error = FT_Err_Invalid_Argument;\r
+ FT_Glyph glyph = NULL;\r
+\r
+\r
+ if ( pglyph == NULL )\r
+ goto Exit;\r
+\r
+ glyph = *pglyph;\r
+ if ( glyph == NULL || glyph->clazz != &ft_outline_glyph_class )\r
+ goto Exit;\r
+\r
+ {\r
+ FT_Glyph copy;\r
+\r
+\r
+ error = FT_Glyph_Copy( glyph, © );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ glyph = copy;\r
+ }\r
+\r
+ {\r
+ FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph;\r
+ FT_Outline* outline = &oglyph->outline;\r
+ FT_UInt num_points, num_contours;\r
+\r
+\r
+ error = FT_Stroker_ParseOutline( stroker, outline, 0 );\r
+ if ( error )\r
+ goto Fail;\r
+\r
+ (void)FT_Stroker_GetCounts( stroker, &num_points, &num_contours );\r
+\r
+ FT_Outline_Done( glyph->library, outline );\r
+\r
+ error = FT_Outline_New( glyph->library,\r
+ num_points, num_contours, outline );\r
+ if ( error )\r
+ goto Fail;\r
+\r
+ outline->n_points = 0;\r
+ outline->n_contours = 0;\r
+\r
+ FT_Stroker_Export( stroker, outline );\r
+ }\r
+\r
+ if ( destroy )\r
+ FT_Done_Glyph( *pglyph );\r
+\r
+ *pglyph = glyph;\r
+ goto Exit;\r
+\r
+ Fail:\r
+ FT_Done_Glyph( glyph );\r
+ glyph = NULL;\r
+\r
+ if ( !destroy )\r
+ *pglyph = NULL;\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+ /* documentation is in ftstroke.h */\r
+\r
+ FT_EXPORT_DEF( FT_Error )\r
+ FT_Glyph_StrokeBorder( FT_Glyph *pglyph,\r
+ FT_Stroker stroker,\r
+ FT_Bool inside,\r
+ FT_Bool destroy )\r
+ {\r
+ FT_Error error = FT_Err_Invalid_Argument;\r
+ FT_Glyph glyph = NULL;\r
+\r
+\r
+ if ( pglyph == NULL )\r
+ goto Exit;\r
+\r
+ glyph = *pglyph;\r
+ if ( glyph == NULL || glyph->clazz != &ft_outline_glyph_class )\r
+ goto Exit;\r
+\r
+ {\r
+ FT_Glyph copy;\r
+\r
+\r
+ error = FT_Glyph_Copy( glyph, © );\r
+ if ( error )\r
+ goto Exit;\r
+\r
+ glyph = copy;\r
+ }\r
+\r
+ {\r
+ FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph;\r
+ FT_StrokerBorder border;\r
+ FT_Outline* outline = &oglyph->outline;\r
+ FT_UInt num_points, num_contours;\r
+\r
+\r
+ border = FT_Outline_GetOutsideBorder( outline );\r
+ if ( inside )\r
+ {\r
+ if ( border == FT_STROKER_BORDER_LEFT )\r
+ border = FT_STROKER_BORDER_RIGHT;\r
+ else\r
+ border = FT_STROKER_BORDER_LEFT;\r
+ }\r
+\r
+ error = FT_Stroker_ParseOutline( stroker, outline, 0 );\r
+ if ( error )\r
+ goto Fail;\r
+\r
+ (void)FT_Stroker_GetBorderCounts( stroker, border,\r
+ &num_points, &num_contours );\r
+\r
+ FT_Outline_Done( glyph->library, outline );\r
+\r
+ error = FT_Outline_New( glyph->library,\r
+ num_points,\r
+ num_contours,\r
+ outline );\r
+ if ( error )\r
+ goto Fail;\r
+\r
+ outline->n_points = 0;\r
+ outline->n_contours = 0;\r
+\r
+ FT_Stroker_ExportBorder( stroker, border, outline );\r
+ }\r
+\r
+ if ( destroy )\r
+ FT_Done_Glyph( *pglyph );\r
+\r
+ *pglyph = glyph;\r
+ goto Exit;\r
+\r
+ Fail:\r
+ FT_Done_Glyph( glyph );\r
+ glyph = NULL;\r
+\r
+ if ( !destroy )\r
+ *pglyph = NULL;\r
+\r
+ Exit:\r
+ return error;\r
+ }\r
+\r
+\r
+/* END */\r
projects / reactos.git / blobdiff