forked from minhngoc25a/freetype2
2042 lines
52 KiB
C
2042 lines
52 KiB
C
/***************************************************************************/
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/* */
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/* ftstroke.c */
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/* */
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/* FreeType path stroker (body). */
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/* */
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/* Copyright 2002, 2003, 2004, 2005, 2006, 2008, 2009 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_STROKER_H
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#include FT_TRIGONOMETRY_H
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#include FT_OUTLINE_H
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#include FT_INTERNAL_MEMORY_H
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_OBJECTS_H
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/* documentation is in ftstroke.h */
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FT_EXPORT_DEF( FT_StrokerBorder )
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FT_Outline_GetInsideBorder( FT_Outline* outline )
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{
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FT_Orientation o = FT_Outline_Get_Orientation( outline );
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return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_RIGHT
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: FT_STROKER_BORDER_LEFT ;
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}
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/* documentation is in ftstroke.h */
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FT_EXPORT_DEF( FT_StrokerBorder )
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FT_Outline_GetOutsideBorder( FT_Outline* outline )
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{
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FT_Orientation o = FT_Outline_Get_Orientation( outline );
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return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_LEFT
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: FT_STROKER_BORDER_RIGHT ;
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}
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/***************************************************************************/
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/***************************************************************************/
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/***** *****/
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/***** BEZIER COMPUTATIONS *****/
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/***** *****/
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/***************************************************************************/
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/***************************************************************************/
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#define FT_SMALL_CONIC_THRESHOLD ( FT_ANGLE_PI / 6 )
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#define FT_SMALL_CUBIC_THRESHOLD ( FT_ANGLE_PI / 6 )
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#define FT_EPSILON 2
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#define FT_IS_SMALL( x ) ( (x) > -FT_EPSILON && (x) < FT_EPSILON )
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static FT_Pos
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ft_pos_abs( FT_Pos x )
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{
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return x >= 0 ? x : -x ;
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}
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static void
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ft_conic_split( FT_Vector* base )
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{
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FT_Pos a, b;
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base[4].x = base[2].x;
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b = base[1].x;
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a = base[3].x = ( base[2].x + b ) / 2;
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b = base[1].x = ( base[0].x + b ) / 2;
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base[2].x = ( a + b ) / 2;
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base[4].y = base[2].y;
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b = base[1].y;
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a = base[3].y = ( base[2].y + b ) / 2;
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b = base[1].y = ( base[0].y + b ) / 2;
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base[2].y = ( a + b ) / 2;
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}
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static FT_Bool
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ft_conic_is_small_enough( FT_Vector* base,
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FT_Angle *angle_in,
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FT_Angle *angle_out )
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{
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FT_Vector d1, d2;
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FT_Angle theta;
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FT_Int close1, close2;
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d1.x = base[1].x - base[2].x;
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d1.y = base[1].y - base[2].y;
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d2.x = base[0].x - base[1].x;
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d2.y = base[0].y - base[1].y;
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close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );
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close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );
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if ( close1 )
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{
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if ( close2 )
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*angle_in = *angle_out = 0;
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else
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*angle_in = *angle_out = FT_Atan2( d2.x, d2.y );
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}
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else if ( close2 )
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{
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*angle_in = *angle_out = FT_Atan2( d1.x, d1.y );
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}
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else
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{
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*angle_in = FT_Atan2( d1.x, d1.y );
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*angle_out = FT_Atan2( d2.x, d2.y );
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}
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theta = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_out ) );
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return FT_BOOL( theta < FT_SMALL_CONIC_THRESHOLD );
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}
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static void
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ft_cubic_split( FT_Vector* base )
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{
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FT_Pos a, b, c, d;
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base[6].x = base[3].x;
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c = base[1].x;
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d = base[2].x;
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base[1].x = a = ( base[0].x + c ) / 2;
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base[5].x = b = ( base[3].x + d ) / 2;
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c = ( c + d ) / 2;
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base[2].x = a = ( a + c ) / 2;
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base[4].x = b = ( b + c ) / 2;
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base[3].x = ( a + b ) / 2;
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base[6].y = base[3].y;
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c = base[1].y;
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d = base[2].y;
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base[1].y = a = ( base[0].y + c ) / 2;
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base[5].y = b = ( base[3].y + d ) / 2;
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c = ( c + d ) / 2;
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base[2].y = a = ( a + c ) / 2;
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base[4].y = b = ( b + c ) / 2;
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base[3].y = ( a + b ) / 2;
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}
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static FT_Bool
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ft_cubic_is_small_enough( FT_Vector* base,
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FT_Angle *angle_in,
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FT_Angle *angle_mid,
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FT_Angle *angle_out )
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{
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FT_Vector d1, d2, d3;
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FT_Angle theta1, theta2;
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FT_Int close1, close2, close3;
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d1.x = base[2].x - base[3].x;
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d1.y = base[2].y - base[3].y;
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d2.x = base[1].x - base[2].x;
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d2.y = base[1].y - base[2].y;
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d3.x = base[0].x - base[1].x;
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d3.y = base[0].y - base[1].y;
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close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y );
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close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y );
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close3 = FT_IS_SMALL( d3.x ) && FT_IS_SMALL( d3.y );
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if ( close1 || close3 )
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{
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if ( close2 )
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{
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/* basically a point */
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*angle_in = *angle_out = *angle_mid = 0;
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}
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else if ( close1 )
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{
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*angle_in = *angle_mid = FT_Atan2( d2.x, d2.y );
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*angle_out = FT_Atan2( d3.x, d3.y );
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}
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else /* close2 */
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{
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*angle_in = FT_Atan2( d1.x, d1.y );
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*angle_mid = *angle_out = FT_Atan2( d2.x, d2.y );
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}
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}
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else if ( close2 )
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{
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*angle_in = *angle_mid = FT_Atan2( d1.x, d1.y );
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*angle_out = FT_Atan2( d3.x, d3.y );
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}
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else
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{
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*angle_in = FT_Atan2( d1.x, d1.y );
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*angle_mid = FT_Atan2( d2.x, d2.y );
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*angle_out = FT_Atan2( d3.x, d3.y );
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}
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theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) );
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theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) );
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return FT_BOOL( theta1 < FT_SMALL_CUBIC_THRESHOLD &&
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theta2 < FT_SMALL_CUBIC_THRESHOLD );
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}
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/***************************************************************************/
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/***************************************************************************/
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/***** *****/
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/***** STROKE BORDERS *****/
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/***** *****/
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/***************************************************************************/
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/***************************************************************************/
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typedef enum FT_StrokeTags_
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{
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FT_STROKE_TAG_ON = 1, /* on-curve point */
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FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */
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FT_STROKE_TAG_BEGIN = 4, /* sub-path start */
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FT_STROKE_TAG_END = 8 /* sub-path end */
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} FT_StrokeTags;
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#define FT_STROKE_TAG_BEGIN_END (FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END)
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typedef struct FT_StrokeBorderRec_
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{
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FT_UInt num_points;
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FT_UInt max_points;
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FT_Vector* points;
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FT_Byte* tags;
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FT_Bool movable;
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FT_Int start; /* index of current sub-path start point */
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FT_Memory memory;
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FT_Bool valid;
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} FT_StrokeBorderRec, *FT_StrokeBorder;
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static FT_Error
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ft_stroke_border_grow( FT_StrokeBorder border,
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FT_UInt new_points )
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{
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FT_UInt old_max = border->max_points;
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FT_UInt new_max = border->num_points + new_points;
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FT_Error error = FT_Err_Ok;
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if ( new_max > old_max )
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{
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FT_UInt cur_max = old_max;
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FT_Memory memory = border->memory;
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while ( cur_max < new_max )
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cur_max += ( cur_max >> 1 ) + 16;
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if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) ||
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FT_RENEW_ARRAY( border->tags, old_max, cur_max ) )
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goto Exit;
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border->max_points = cur_max;
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}
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Exit:
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return error;
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}
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static void
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ft_stroke_border_close( FT_StrokeBorder border,
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FT_Bool reverse )
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{
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FT_UInt start = border->start;
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FT_UInt count = border->num_points;
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FT_ASSERT( border->start >= 0 );
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/* don't record empty paths! */
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if ( count <= start + 1U )
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border->num_points = start;
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else
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{
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/* copy the last point to the start of this sub-path, since */
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/* it contains the `adjusted' starting coordinates */
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border->num_points = --count;
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border->points[start] = border->points[count];
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if ( reverse )
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{
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/* reverse the points */
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{
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FT_Vector* vec1 = border->points + start + 1;
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FT_Vector* vec2 = border->points + count - 1;
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for ( ; vec1 < vec2; vec1++, vec2-- )
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{
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FT_Vector tmp;
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tmp = *vec1;
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*vec1 = *vec2;
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*vec2 = tmp;
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}
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}
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/* then the tags */
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{
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FT_Byte* tag1 = border->tags + start + 1;
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FT_Byte* tag2 = border->tags + count - 1;
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for ( ; tag1 < tag2; tag1++, tag2-- )
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{
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FT_Byte tmp;
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tmp = *tag1;
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*tag1 = *tag2;
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*tag2 = tmp;
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}
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}
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}
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border->tags[start ] |= FT_STROKE_TAG_BEGIN;
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border->tags[count - 1] |= FT_STROKE_TAG_END;
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}
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border->start = -1;
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border->movable = FALSE;
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}
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static FT_Error
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ft_stroke_border_lineto( FT_StrokeBorder border,
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FT_Vector* to,
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FT_Bool movable )
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{
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FT_Error error = FT_Err_Ok;
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FT_ASSERT( border->start >= 0 );
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if ( border->movable )
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{
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/* move last point */
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border->points[border->num_points - 1] = *to;
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}
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else
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{
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/* add one point */
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error = ft_stroke_border_grow( border, 1 );
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if ( !error )
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{
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FT_Vector* vec = border->points + border->num_points;
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FT_Byte* tag = border->tags + border->num_points;
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vec[0] = *to;
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tag[0] = FT_STROKE_TAG_ON;
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border->num_points += 1;
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}
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}
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border->movable = movable;
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return error;
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}
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static FT_Error
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ft_stroke_border_conicto( FT_StrokeBorder border,
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FT_Vector* control,
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FT_Vector* to )
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{
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FT_Error error;
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FT_ASSERT( border->start >= 0 );
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error = ft_stroke_border_grow( border, 2 );
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if ( !error )
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{
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FT_Vector* vec = border->points + border->num_points;
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FT_Byte* tag = border->tags + border->num_points;
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vec[0] = *control;
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vec[1] = *to;
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tag[0] = 0;
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tag[1] = FT_STROKE_TAG_ON;
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border->num_points += 2;
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}
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border->movable = FALSE;
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return error;
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}
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static FT_Error
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ft_stroke_border_cubicto( FT_StrokeBorder border,
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FT_Vector* control1,
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FT_Vector* control2,
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FT_Vector* to )
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{
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FT_Error error;
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FT_ASSERT( border->start >= 0 );
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error = ft_stroke_border_grow( border, 3 );
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if ( !error )
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{
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FT_Vector* vec = border->points + border->num_points;
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FT_Byte* tag = border->tags + border->num_points;
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vec[0] = *control1;
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vec[1] = *control2;
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vec[2] = *to;
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tag[0] = FT_STROKE_TAG_CUBIC;
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tag[1] = FT_STROKE_TAG_CUBIC;
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tag[2] = FT_STROKE_TAG_ON;
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border->num_points += 3;
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}
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border->movable = FALSE;
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return error;
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}
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#define FT_ARC_CUBIC_ANGLE ( FT_ANGLE_PI / 2 )
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static FT_Error
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ft_stroke_border_arcto( FT_StrokeBorder border,
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FT_Vector* center,
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FT_Fixed radius,
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FT_Angle angle_start,
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FT_Angle angle_diff )
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{
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FT_Angle total, angle, step, rotate, next, theta;
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FT_Vector a, b, a2, b2;
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FT_Fixed length;
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FT_Error error = FT_Err_Ok;
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/* compute start point */
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FT_Vector_From_Polar( &a, radius, angle_start );
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a.x += center->x;
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a.y += center->y;
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total = angle_diff;
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angle = angle_start;
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rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2 : -FT_ANGLE_PI2;
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while ( total != 0 )
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{
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step = total;
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if ( step > FT_ARC_CUBIC_ANGLE )
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step = FT_ARC_CUBIC_ANGLE;
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else if ( step < -FT_ARC_CUBIC_ANGLE )
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step = -FT_ARC_CUBIC_ANGLE;
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next = angle + step;
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theta = step;
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if ( theta < 0 )
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theta = -theta;
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theta >>= 1;
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/* compute end point */
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FT_Vector_From_Polar( &b, radius, next );
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b.x += center->x;
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b.y += center->y;
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/* compute first and second control points */
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length = FT_MulDiv( radius, FT_Sin( theta ) * 4,
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( 0x10000L + FT_Cos( theta ) ) * 3 );
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FT_Vector_From_Polar( &a2, length, angle + rotate );
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a2.x += a.x;
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a2.y += a.y;
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FT_Vector_From_Polar( &b2, length, next - rotate );
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b2.x += b.x;
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b2.y += b.y;
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/* add cubic arc */
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error = ft_stroke_border_cubicto( border, &a2, &b2, &b );
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if ( error )
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break;
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/* process the rest of the arc ?? */
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a = b;
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total -= step;
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angle = next;
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}
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return error;
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}
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static FT_Error
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ft_stroke_border_moveto( FT_StrokeBorder border,
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FT_Vector* to )
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{
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/* close current open path if any ? */
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if ( border->start >= 0 )
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ft_stroke_border_close( border, FALSE );
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border->start = border->num_points;
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border->movable = FALSE;
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return ft_stroke_border_lineto( border, to, FALSE );
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}
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static void
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ft_stroke_border_init( FT_StrokeBorder border,
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FT_Memory memory )
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{
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border->memory = memory;
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border->points = NULL;
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border->tags = NULL;
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border->num_points = 0;
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border->max_points = 0;
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border->start = -1;
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border->valid = FALSE;
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}
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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)( 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_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;
|
|
FT_Memory memory;
|
|
FT_Stroker stroker;
|
|
|
|
|
|
if ( !library )
|
|
return FT_Err_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 )
|
|
{
|
|
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->library->memory;
|
|
|
|
|
|
ft_stroke_border_done( &stroker->borders[0] );
|
|
ft_stroke_border_done( &stroker->borders[1] );
|
|
|
|
stroker->library = 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 = 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;
|
|
}
|
|
|
|
|
|
/* 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 = 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_StrokeBorder border = stroker->borders + side;
|
|
FT_Angle phi, theta, rotate;
|
|
FT_Fixed length, thcos, sigma;
|
|
FT_Vector delta;
|
|
FT_Error error = FT_Err_Ok;
|
|
|
|
|
|
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 = FALSE;
|
|
}
|
|
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, 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_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 = FALSE;
|
|
|
|
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, 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 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, TRUE );
|
|
}
|
|
|
|
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, FALSE );
|
|
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, TRUE );
|
|
}
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
static FT_Error
|
|
ft_stroker_process_corner( FT_Stroker stroker )
|
|
{
|
|
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 */
|
|
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 = FALSE;
|
|
|
|
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;
|
|
|
|
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, TRUE );
|
|
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 = FT_Err_Ok;
|
|
FT_Vector bez_stack[34];
|
|
FT_Vector* arc;
|
|
FT_Vector* limit = bez_stack + 30;
|
|
FT_Angle start_angle;
|
|
FT_Bool first_arc = TRUE;
|
|
|
|
|
|
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 = FALSE;
|
|
|
|
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 = FT_Err_Ok;
|
|
FT_Vector bez_stack[37];
|
|
FT_Vector* arc;
|
|
FT_Vector* limit = bez_stack + 32;
|
|
FT_Angle start_angle;
|
|
FT_Bool first_arc = TRUE;
|
|
|
|
|
|
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 = FALSE;
|
|
|
|
/* 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 `FT_Stroker_EndSubPath' routine. */
|
|
/* */
|
|
stroker->first_point = TRUE;
|
|
stroker->center = *to;
|
|
stroker->subpath_open = open;
|
|
|
|
/* record the subpath start point for each border */
|
|
stroker->subpath_start = *to;
|
|
|
|
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 = 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 = 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->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 */
|
|
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, TRUE );
|
|
ft_stroke_border_close( stroker->borders + 1, FALSE );
|
|
}
|
|
|
|
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 FT_Err_Ok;
|
|
|
|
Exit:
|
|
return error;
|
|
|
|
Invalid_Outline:
|
|
return FT_Err_Invalid_Outline;
|
|
}
|
|
|
|
/* declare an extern to access ft_outline_glyph_class global 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;
|
|
FT_Library library = stroker->library;
|
|
FT_UNUSED(library);
|
|
|
|
if ( pglyph == NULL )
|
|
goto Exit;
|
|
|
|
glyph = *pglyph;
|
|
if ( glyph == NULL || 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;
|
|
|
|
(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;
|
|
FT_Library library = stroker->library;
|
|
FT_UNUSED(library);
|
|
|
|
if ( pglyph == NULL )
|
|
goto Exit;
|
|
|
|
glyph = *pglyph;
|
|
if ( glyph == NULL || 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;
|
|
|
|
(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 */
|