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5172
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/***************************************************************************/
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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 2002-2006, 2008-2011 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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141 |
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142 |
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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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174 |
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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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182 |
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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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186 |
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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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214 |
*angle_out = FT_Atan2( d3.x, d3.y );
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215 |
}
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216 |
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217 |
theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) );
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218 |
theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) );
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219 |
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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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223 |
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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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239 |
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240 |
} FT_StrokeTags;
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#define FT_STROKE_TAG_BEGIN_END (FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END)
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243 |
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typedef struct FT_StrokeBorderRec_
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{
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246 |
FT_UInt num_points;
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FT_UInt max_points;
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248 |
FT_Vector* points;
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249 |
FT_Byte* tags;
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FT_Bool movable;
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251 |
FT_Int start; /* index of current sub-path start point */
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252 |
FT_Memory memory;
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FT_Bool valid;
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254 |
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255 |
} FT_StrokeBorderRec, *FT_StrokeBorder;
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256 |
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257 |
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258 |
static FT_Error
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259 |
ft_stroke_border_grow( FT_StrokeBorder border,
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260 |
FT_UInt new_points )
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261 |
{
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262 |
FT_UInt old_max = border->max_points;
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263 |
FT_UInt new_max = border->num_points + new_points;
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264 |
FT_Error error = FT_Err_Ok;
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265 |
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266 |
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267 |
if ( new_max > old_max )
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268 |
{
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269 |
FT_UInt cur_max = old_max;
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270 |
FT_Memory memory = border->memory;
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271 |
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272 |
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273 |
while ( cur_max < new_max )
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274 |
cur_max += ( cur_max >> 1 ) + 16;
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275 |
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276 |
if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) ||
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277 |
FT_RENEW_ARRAY( border->tags, old_max, cur_max ) )
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278 |
goto Exit;
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279 |
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280 |
border->max_points = cur_max;
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281 |
}
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282 |
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283 |
Exit:
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284 |
return error;
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285 |
}
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286 |
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287 |
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288 |
static void
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289 |
ft_stroke_border_close( FT_StrokeBorder border,
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290 |
FT_Bool reverse )
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291 |
{
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292 |
FT_UInt start = border->start;
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293 |
FT_UInt count = border->num_points;
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294 |
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295 |
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296 |
FT_ASSERT( border->start >= 0 );
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297 |
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298 |
/* don't record empty paths! */
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299 |
if ( count <= start + 1U )
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300 |
border->num_points = start;
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301 |
else
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302 |
{
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303 |
/* copy the last point to the start of this sub-path, since */
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304 |
/* it contains the `adjusted' starting coordinates */
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305 |
border->num_points = --count;
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306 |
border->points[start] = border->points[count];
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307 |
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308 |
if ( reverse )
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309 |
{
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310 |
/* reverse the points */
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311 |
{
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312 |
FT_Vector* vec1 = border->points + start + 1;
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313 |
FT_Vector* vec2 = border->points + count - 1;
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314 |
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315 |
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316 |
for ( ; vec1 < vec2; vec1++, vec2-- )
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317 |
{
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318 |
FT_Vector tmp;
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319 |
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320 |
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321 |
tmp = *vec1;
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322 |
*vec1 = *vec2;
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323 |
*vec2 = tmp;
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324 |
}
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325 |
}
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326 |
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327 |
/* then the tags */
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328 |
{
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329 |
FT_Byte* tag1 = border->tags + start + 1;
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330 |
FT_Byte* tag2 = border->tags + count - 1;
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331 |
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332 |
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333 |
for ( ; tag1 < tag2; tag1++, tag2-- )
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334 |
{
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335 |
FT_Byte tmp;
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336 |
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337 |
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338 |
tmp = *tag1;
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339 |
*tag1 = *tag2;
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340 |
*tag2 = tmp;
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341 |
}
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342 |
}
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343 |
}
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344 |
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345 |
border->tags[start ] |= FT_STROKE_TAG_BEGIN;
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346 |
border->tags[count - 1] |= FT_STROKE_TAG_END;
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347 |
}
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348 |
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349 |
border->start = -1;
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350 |
border->movable = FALSE;
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351 |
}
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352 |
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353 |
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354 |
static FT_Error
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355 |
ft_stroke_border_lineto( FT_StrokeBorder border,
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356 |
FT_Vector* to,
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357 |
FT_Bool movable )
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358 |
{
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359 |
FT_Error error = FT_Err_Ok;
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360 |
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361 |
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362 |
FT_ASSERT( border->start >= 0 );
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363 |
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364 |
if ( border->movable )
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365 |
{
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366 |
/* move last point */
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367 |
border->points[border->num_points - 1] = *to;
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368 |
}
|
|
|
369 |
else
|
|
|
370 |
{
|
|
|
371 |
/* add one point */
|
|
|
372 |
error = ft_stroke_border_grow( border, 1 );
|
|
|
373 |
if ( !error )
|
|
|
374 |
{
|
|
|
375 |
FT_Vector* vec = border->points + border->num_points;
|
|
|
376 |
FT_Byte* tag = border->tags + border->num_points;
|
|
|
377 |
|
|
|
378 |
|
|
|
379 |
vec[0] = *to;
|
|
|
380 |
tag[0] = FT_STROKE_TAG_ON;
|
|
|
381 |
|
|
|
382 |
border->num_points += 1;
|
|
|
383 |
}
|
|
|
384 |
}
|
|
|
385 |
border->movable = movable;
|
|
|
386 |
return error;
|
|
|
387 |
}
|
|
|
388 |
|
|
|
389 |
|
|
|
390 |
static FT_Error
|
|
|
391 |
ft_stroke_border_conicto( FT_StrokeBorder border,
|
|
|
392 |
FT_Vector* control,
|
|
|
393 |
FT_Vector* to )
|
|
|
394 |
{
|
|
|
395 |
FT_Error error;
|
|
|
396 |
|
|
|
397 |
|
|
|
398 |
FT_ASSERT( border->start >= 0 );
|
|
|
399 |
|
|
|
400 |
error = ft_stroke_border_grow( border, 2 );
|
|
|
401 |
if ( !error )
|
|
|
402 |
{
|
|
|
403 |
FT_Vector* vec = border->points + border->num_points;
|
|
|
404 |
FT_Byte* tag = border->tags + border->num_points;
|
|
|
405 |
|
|
|
406 |
vec[0] = *control;
|
|
|
407 |
vec[1] = *to;
|
|
|
408 |
|
|
|
409 |
tag[0] = 0;
|
|
|
410 |
tag[1] = FT_STROKE_TAG_ON;
|
|
|
411 |
|
|
|
412 |
border->num_points += 2;
|
|
|
413 |
}
|
|
|
414 |
border->movable = FALSE;
|
|
|
415 |
return error;
|
|
|
416 |
}
|
|
|
417 |
|
|
|
418 |
|
|
|
419 |
static FT_Error
|
|
|
420 |
ft_stroke_border_cubicto( FT_StrokeBorder border,
|
|
|
421 |
FT_Vector* control1,
|
|
|
422 |
FT_Vector* control2,
|
|
|
423 |
FT_Vector* to )
|
|
|
424 |
{
|
|
|
425 |
FT_Error error;
|
|
|
426 |
|
|
|
427 |
|
|
|
428 |
FT_ASSERT( border->start >= 0 );
|
|
|
429 |
|
|
|
430 |
error = ft_stroke_border_grow( border, 3 );
|
|
|
431 |
if ( !error )
|
|
|
432 |
{
|
|
|
433 |
FT_Vector* vec = border->points + border->num_points;
|
|
|
434 |
FT_Byte* tag = border->tags + border->num_points;
|
|
|
435 |
|
|
|
436 |
|
|
|
437 |
vec[0] = *control1;
|
|
|
438 |
vec[1] = *control2;
|
|
|
439 |
vec[2] = *to;
|
|
|
440 |
|
|
|
441 |
tag[0] = FT_STROKE_TAG_CUBIC;
|
|
|
442 |
tag[1] = FT_STROKE_TAG_CUBIC;
|
|
|
443 |
tag[2] = FT_STROKE_TAG_ON;
|
|
|
444 |
|
|
|
445 |
border->num_points += 3;
|
|
|
446 |
}
|
|
|
447 |
border->movable = FALSE;
|
|
|
448 |
return error;
|
|
|
449 |
}
|
|
|
450 |
|
|
|
451 |
|
|
|
452 |
#define FT_ARC_CUBIC_ANGLE ( FT_ANGLE_PI / 2 )
|
|
|
453 |
|
|
|
454 |
|
|
|
455 |
static FT_Error
|
|
|
456 |
ft_stroke_border_arcto( FT_StrokeBorder border,
|
|
|
457 |
FT_Vector* center,
|
|
|
458 |
FT_Fixed radius,
|
|
|
459 |
FT_Angle angle_start,
|
|
|
460 |
FT_Angle angle_diff )
|
|
|
461 |
{
|
|
|
462 |
FT_Angle total, angle, step, rotate, next, theta;
|
|
|
463 |
FT_Vector a, b, a2, b2;
|
|
|
464 |
FT_Fixed length;
|
|
|
465 |
FT_Error error = FT_Err_Ok;
|
|
|
466 |
|
|
|
467 |
|
|
|
468 |
/* compute start point */
|
|
|
469 |
FT_Vector_From_Polar( &a, radius, angle_start );
|
|
|
470 |
a.x += center->x;
|
|
|
471 |
a.y += center->y;
|
|
|
472 |
|
|
|
473 |
total = angle_diff;
|
|
|
474 |
angle = angle_start;
|
|
|
475 |
rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2 : -FT_ANGLE_PI2;
|
|
|
476 |
|
|
|
477 |
while ( total != 0 )
|
|
|
478 |
{
|
|
|
479 |
step = total;
|
|
|
480 |
if ( step > FT_ARC_CUBIC_ANGLE )
|
|
|
481 |
step = FT_ARC_CUBIC_ANGLE;
|
|
|
482 |
|
|
|
483 |
else if ( step < -FT_ARC_CUBIC_ANGLE )
|
|
|
484 |
step = -FT_ARC_CUBIC_ANGLE;
|
|
|
485 |
|
|
|
486 |
next = angle + step;
|
|
|
487 |
theta = step;
|
|
|
488 |
if ( theta < 0 )
|
|
|
489 |
theta = -theta;
|
|
|
490 |
|
|
|
491 |
theta >>= 1;
|
|
|
492 |
|
|
|
493 |
/* compute end point */
|
|
|
494 |
FT_Vector_From_Polar( &b, radius, next );
|
|
|
495 |
b.x += center->x;
|
|
|
496 |
b.y += center->y;
|
|
|
497 |
|
|
|
498 |
/* compute first and second control points */
|
|
|
499 |
length = FT_MulDiv( radius, FT_Sin( theta ) * 4,
|
|
|
500 |
( 0x10000L + FT_Cos( theta ) ) * 3 );
|
|
|
501 |
|
|
|
502 |
FT_Vector_From_Polar( &a2, length, angle + rotate );
|
|
|
503 |
a2.x += a.x;
|
|
|
504 |
a2.y += a.y;
|
|
|
505 |
|
|
|
506 |
FT_Vector_From_Polar( &b2, length, next - rotate );
|
|
|
507 |
b2.x += b.x;
|
|
|
508 |
b2.y += b.y;
|
|
|
509 |
|
|
|
510 |
/* add cubic arc */
|
|
|
511 |
error = ft_stroke_border_cubicto( border, &a2, &b2, &b );
|
|
|
512 |
if ( error )
|
|
|
513 |
break;
|
|
|
514 |
|
|
|
515 |
/* process the rest of the arc ?? */
|
|
|
516 |
a = b;
|
|
|
517 |
total -= step;
|
|
|
518 |
angle = next;
|
|
|
519 |
}
|
|
|
520 |
|
|
|
521 |
return error;
|
|
|
522 |
}
|
|
|
523 |
|
|
|
524 |
|
|
|
525 |
static FT_Error
|
|
|
526 |
ft_stroke_border_moveto( FT_StrokeBorder border,
|
|
|
527 |
FT_Vector* to )
|
|
|
528 |
{
|
|
|
529 |
/* close current open path if any ? */
|
|
|
530 |
if ( border->start >= 0 )
|
|
|
531 |
ft_stroke_border_close( border, FALSE );
|
|
|
532 |
|
|
|
533 |
border->start = border->num_points;
|
|
|
534 |
border->movable = FALSE;
|
|
|
535 |
|
|
|
536 |
return ft_stroke_border_lineto( border, to, FALSE );
|
|
|
537 |
}
|
|
|
538 |
|
|
|
539 |
|
|
|
540 |
static void
|
|
|
541 |
ft_stroke_border_init( FT_StrokeBorder border,
|
|
|
542 |
FT_Memory memory )
|
|
|
543 |
{
|
|
|
544 |
border->memory = memory;
|
|
|
545 |
border->points = NULL;
|
|
|
546 |
border->tags = NULL;
|
|
|
547 |
|
|
|
548 |
border->num_points = 0;
|
|
|
549 |
border->max_points = 0;
|
|
|
550 |
border->start = -1;
|
|
|
551 |
border->valid = FALSE;
|
|
|
552 |
}
|
|
|
553 |
|
|
|
554 |
|
|
|
555 |
static void
|
|
|
556 |
ft_stroke_border_reset( FT_StrokeBorder border )
|
|
|
557 |
{
|
|
|
558 |
border->num_points = 0;
|
|
|
559 |
border->start = -1;
|
|
|
560 |
border->valid = FALSE;
|
|
|
561 |
}
|
|
|
562 |
|
|
|
563 |
|
|
|
564 |
static void
|
|
|
565 |
ft_stroke_border_done( FT_StrokeBorder border )
|
|
|
566 |
{
|
|
|
567 |
FT_Memory memory = border->memory;
|
|
|
568 |
|
|
|
569 |
|
|
|
570 |
FT_FREE( border->points );
|
|
|
571 |
FT_FREE( border->tags );
|
|
|
572 |
|
|
|
573 |
border->num_points = 0;
|
|
|
574 |
border->max_points = 0;
|
|
|
575 |
border->start = -1;
|
|
|
576 |
border->valid = FALSE;
|
|
|
577 |
}
|
|
|
578 |
|
|
|
579 |
|
|
|
580 |
static FT_Error
|
|
|
581 |
ft_stroke_border_get_counts( FT_StrokeBorder border,
|
|
|
582 |
FT_UInt *anum_points,
|
|
|
583 |
FT_UInt *anum_contours )
|
|
|
584 |
{
|
|
|
585 |
FT_Error error = FT_Err_Ok;
|
|
|
586 |
FT_UInt num_points = 0;
|
|
|
587 |
FT_UInt num_contours = 0;
|
|
|
588 |
|
|
|
589 |
FT_UInt count = border->num_points;
|
|
|
590 |
FT_Vector* point = border->points;
|
|
|
591 |
FT_Byte* tags = border->tags;
|
|
|
592 |
FT_Int in_contour = 0;
|
|
|
593 |
|
|
|
594 |
|
|
|
595 |
for ( ; count > 0; count--, num_points++, point++, tags++ )
|
|
|
596 |
{
|
|
|
597 |
if ( tags[0] & FT_STROKE_TAG_BEGIN )
|
|
|
598 |
{
|
|
|
599 |
if ( in_contour != 0 )
|
|
|
600 |
goto Fail;
|
|
|
601 |
|
|
|
602 |
in_contour = 1;
|
|
|
603 |
}
|
|
|
604 |
else if ( in_contour == 0 )
|
|
|
605 |
goto Fail;
|
|
|
606 |
|
|
|
607 |
if ( tags[0] & FT_STROKE_TAG_END )
|
|
|
608 |
{
|
|
|
609 |
in_contour = 0;
|
|
|
610 |
num_contours++;
|
|
|
611 |
}
|
|
|
612 |
}
|
|
|
613 |
|
|
|
614 |
if ( in_contour != 0 )
|
|
|
615 |
goto Fail;
|
|
|
616 |
|
|
|
617 |
border->valid = TRUE;
|
|
|
618 |
|
|
|
619 |
Exit:
|
|
|
620 |
*anum_points = num_points;
|
|
|
621 |
*anum_contours = num_contours;
|
|
|
622 |
return error;
|
|
|
623 |
|
|
|
624 |
Fail:
|
|
|
625 |
num_points = 0;
|
|
|
626 |
num_contours = 0;
|
|
|
627 |
goto Exit;
|
|
|
628 |
}
|
|
|
629 |
|
|
|
630 |
|
|
|
631 |
static void
|
|
|
632 |
ft_stroke_border_export( FT_StrokeBorder border,
|
|
|
633 |
FT_Outline* outline )
|
|
|
634 |
{
|
|
|
635 |
/* copy point locations */
|
|
|
636 |
FT_ARRAY_COPY( outline->points + outline->n_points,
|
|
|
637 |
border->points,
|
|
|
638 |
border->num_points );
|
|
|
639 |
|
|
|
640 |
/* copy tags */
|
|
|
641 |
{
|
|
|
642 |
FT_UInt count = border->num_points;
|
|
|
643 |
FT_Byte* read = border->tags;
|
|
|
644 |
FT_Byte* write = (FT_Byte*)outline->tags + outline->n_points;
|
|
|
645 |
|
|
|
646 |
|
|
|
647 |
for ( ; count > 0; count--, read++, write++ )
|
|
|
648 |
{
|
|
|
649 |
if ( *read & FT_STROKE_TAG_ON )
|
|
|
650 |
*write = FT_CURVE_TAG_ON;
|
|
|
651 |
else if ( *read & FT_STROKE_TAG_CUBIC )
|
|
|
652 |
*write = FT_CURVE_TAG_CUBIC;
|
|
|
653 |
else
|
|
|
654 |
*write = FT_CURVE_TAG_CONIC;
|
|
|
655 |
}
|
|
|
656 |
}
|
|
|
657 |
|
|
|
658 |
/* copy contours */
|
|
|
659 |
{
|
|
|
660 |
FT_UInt count = border->num_points;
|
|
|
661 |
FT_Byte* tags = border->tags;
|
|
|
662 |
FT_Short* write = outline->contours + outline->n_contours;
|
|
|
663 |
FT_Short idx = (FT_Short)outline->n_points;
|
|
|
664 |
|
|
|
665 |
|
|
|
666 |
for ( ; count > 0; count--, tags++, idx++ )
|
|
|
667 |
{
|
|
|
668 |
if ( *tags & FT_STROKE_TAG_END )
|
|
|
669 |
{
|
|
|
670 |
*write++ = idx;
|
|
|
671 |
outline->n_contours++;
|
|
|
672 |
}
|
|
|
673 |
}
|
|
|
674 |
}
|
|
|
675 |
|
|
|
676 |
outline->n_points = (short)( outline->n_points + border->num_points );
|
|
|
677 |
|
|
|
678 |
FT_ASSERT( FT_Outline_Check( outline ) == 0 );
|
|
|
679 |
}
|
|
|
680 |
|
|
|
681 |
|
|
|
682 |
/***************************************************************************/
|
|
|
683 |
/***************************************************************************/
|
|
|
684 |
/***** *****/
|
|
|
685 |
/***** STROKER *****/
|
|
|
686 |
/***** *****/
|
|
|
687 |
/***************************************************************************/
|
|
|
688 |
/***************************************************************************/
|
|
|
689 |
|
|
|
690 |
#define FT_SIDE_TO_ROTATE( s ) ( FT_ANGLE_PI2 - (s) * FT_ANGLE_PI )
|
|
|
691 |
|
|
|
692 |
typedef struct FT_StrokerRec_
|
|
|
693 |
{
|
|
|
694 |
FT_Angle angle_in;
|
|
|
695 |
FT_Angle angle_out;
|
|
|
696 |
FT_Vector center;
|
|
|
697 |
FT_Bool first_point;
|
|
|
698 |
FT_Bool subpath_open;
|
|
|
699 |
FT_Angle subpath_angle;
|
|
|
700 |
FT_Vector subpath_start;
|
|
|
701 |
|
|
|
702 |
FT_Stroker_LineCap line_cap;
|
|
|
703 |
FT_Stroker_LineJoin line_join;
|
|
|
704 |
FT_Fixed miter_limit;
|
|
|
705 |
FT_Fixed radius;
|
|
|
706 |
|
|
|
707 |
FT_StrokeBorderRec borders[2];
|
|
|
708 |
FT_Library library;
|
|
|
709 |
|
|
|
710 |
} FT_StrokerRec;
|
|
|
711 |
|
|
|
712 |
|
|
|
713 |
/* documentation is in ftstroke.h */
|
|
|
714 |
|
|
|
715 |
FT_EXPORT_DEF( FT_Error )
|
|
|
716 |
FT_Stroker_New( FT_Library library,
|
|
|
717 |
FT_Stroker *astroker )
|
|
|
718 |
{
|
|
|
719 |
FT_Error error;
|
|
|
720 |
FT_Memory memory;
|
|
|
721 |
FT_Stroker stroker;
|
|
|
722 |
|
|
|
723 |
|
|
|
724 |
if ( !library )
|
|
|
725 |
return FT_Err_Invalid_Argument;
|
|
|
726 |
|
|
|
727 |
memory = library->memory;
|
|
|
728 |
|
|
|
729 |
if ( !FT_NEW( stroker ) )
|
|
|
730 |
{
|
|
|
731 |
stroker->library = library;
|
|
|
732 |
|
|
|
733 |
ft_stroke_border_init( &stroker->borders[0], memory );
|
|
|
734 |
ft_stroke_border_init( &stroker->borders[1], memory );
|
|
|
735 |
}
|
|
|
736 |
*astroker = stroker;
|
|
|
737 |
return error;
|
|
|
738 |
}
|
|
|
739 |
|
|
|
740 |
|
|
|
741 |
/* documentation is in ftstroke.h */
|
|
|
742 |
|
|
|
743 |
FT_EXPORT_DEF( void )
|
|
|
744 |
FT_Stroker_Set( FT_Stroker stroker,
|
|
|
745 |
FT_Fixed radius,
|
|
|
746 |
FT_Stroker_LineCap line_cap,
|
|
|
747 |
FT_Stroker_LineJoin line_join,
|
|
|
748 |
FT_Fixed miter_limit )
|
|
|
749 |
{
|
|
|
750 |
stroker->radius = radius;
|
|
|
751 |
stroker->line_cap = line_cap;
|
|
|
752 |
stroker->line_join = line_join;
|
|
|
753 |
stroker->miter_limit = miter_limit;
|
|
|
754 |
|
|
|
755 |
FT_Stroker_Rewind( stroker );
|
|
|
756 |
}
|
|
|
757 |
|
|
|
758 |
|
|
|
759 |
/* documentation is in ftstroke.h */
|
|
|
760 |
|
|
|
761 |
FT_EXPORT_DEF( void )
|
|
|
762 |
FT_Stroker_Rewind( FT_Stroker stroker )
|
|
|
763 |
{
|
|
|
764 |
if ( stroker )
|
|
|
765 |
{
|
|
|
766 |
ft_stroke_border_reset( &stroker->borders[0] );
|
|
|
767 |
ft_stroke_border_reset( &stroker->borders[1] );
|
|
|
768 |
}
|
|
|
769 |
}
|
|
|
770 |
|
|
|
771 |
|
|
|
772 |
/* documentation is in ftstroke.h */
|
|
|
773 |
|
|
|
774 |
FT_EXPORT_DEF( void )
|
|
|
775 |
FT_Stroker_Done( FT_Stroker stroker )
|
|
|
776 |
{
|
|
|
777 |
if ( stroker )
|
|
|
778 |
{
|
|
|
779 |
FT_Memory memory = stroker->library->memory;
|
|
|
780 |
|
|
|
781 |
|
|
|
782 |
ft_stroke_border_done( &stroker->borders[0] );
|
|
|
783 |
ft_stroke_border_done( &stroker->borders[1] );
|
|
|
784 |
|
|
|
785 |
stroker->library = NULL;
|
|
|
786 |
FT_FREE( stroker );
|
|
|
787 |
}
|
|
|
788 |
}
|
|
|
789 |
|
|
|
790 |
|
|
|
791 |
/* creates a circular arc at a corner or cap */
|
|
|
792 |
static FT_Error
|
|
|
793 |
ft_stroker_arcto( FT_Stroker stroker,
|
|
|
794 |
FT_Int side )
|
|
|
795 |
{
|
|
|
796 |
FT_Angle total, rotate;
|
|
|
797 |
FT_Fixed radius = stroker->radius;
|
|
|
798 |
FT_Error error = FT_Err_Ok;
|
|
|
799 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
800 |
|
|
|
801 |
|
|
|
802 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
803 |
|
|
|
804 |
total = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
|
|
|
805 |
if ( total == FT_ANGLE_PI )
|
|
|
806 |
total = -rotate * 2;
|
|
|
807 |
|
|
|
808 |
error = ft_stroke_border_arcto( border,
|
|
|
809 |
&stroker->center,
|
|
|
810 |
radius,
|
|
|
811 |
stroker->angle_in + rotate,
|
|
|
812 |
total );
|
|
|
813 |
border->movable = FALSE;
|
|
|
814 |
return error;
|
|
|
815 |
}
|
|
|
816 |
|
|
|
817 |
|
|
|
818 |
/* adds a cap at the end of an opened path */
|
|
|
819 |
static FT_Error
|
|
|
820 |
ft_stroker_cap( FT_Stroker stroker,
|
|
|
821 |
FT_Angle angle,
|
|
|
822 |
FT_Int side )
|
|
|
823 |
{
|
|
|
824 |
FT_Error error = FT_Err_Ok;
|
|
|
825 |
|
|
|
826 |
|
|
|
827 |
if ( stroker->line_cap == FT_STROKER_LINECAP_ROUND )
|
|
|
828 |
{
|
|
|
829 |
/* add a round cap */
|
|
|
830 |
stroker->angle_in = angle;
|
|
|
831 |
stroker->angle_out = angle + FT_ANGLE_PI;
|
|
|
832 |
error = ft_stroker_arcto( stroker, side );
|
|
|
833 |
}
|
|
|
834 |
else if ( stroker->line_cap == FT_STROKER_LINECAP_SQUARE )
|
|
|
835 |
{
|
|
|
836 |
/* add a square cap */
|
|
|
837 |
FT_Vector delta, delta2;
|
|
|
838 |
FT_Angle rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
839 |
FT_Fixed radius = stroker->radius;
|
|
|
840 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
841 |
|
|
|
842 |
|
|
|
843 |
FT_Vector_From_Polar( &delta2, radius, angle + rotate );
|
|
|
844 |
FT_Vector_From_Polar( &delta, radius, angle );
|
|
|
845 |
|
|
|
846 |
delta.x += stroker->center.x + delta2.x;
|
|
|
847 |
delta.y += stroker->center.y + delta2.y;
|
|
|
848 |
|
|
|
849 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
850 |
if ( error )
|
|
|
851 |
goto Exit;
|
|
|
852 |
|
|
|
853 |
FT_Vector_From_Polar( &delta2, radius, angle - rotate );
|
|
|
854 |
FT_Vector_From_Polar( &delta, radius, angle );
|
|
|
855 |
|
|
|
856 |
delta.x += delta2.x + stroker->center.x;
|
|
|
857 |
delta.y += delta2.y + stroker->center.y;
|
|
|
858 |
|
|
|
859 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
860 |
}
|
|
|
861 |
else if ( stroker->line_cap == FT_STROKER_LINECAP_BUTT )
|
|
|
862 |
{
|
|
|
863 |
/* add a butt ending */
|
|
|
864 |
FT_Vector delta;
|
|
|
865 |
FT_Angle rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
866 |
FT_Fixed radius = stroker->radius;
|
|
|
867 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
868 |
|
|
|
869 |
|
|
|
870 |
FT_Vector_From_Polar( &delta, radius, angle + rotate );
|
|
|
871 |
|
|
|
872 |
delta.x += stroker->center.x;
|
|
|
873 |
delta.y += stroker->center.y;
|
|
|
874 |
|
|
|
875 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
876 |
if ( error )
|
|
|
877 |
goto Exit;
|
|
|
878 |
|
|
|
879 |
FT_Vector_From_Polar( &delta, radius, angle - rotate );
|
|
|
880 |
|
|
|
881 |
delta.x += stroker->center.x;
|
|
|
882 |
delta.y += stroker->center.y;
|
|
|
883 |
|
|
|
884 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
885 |
}
|
|
|
886 |
|
|
|
887 |
Exit:
|
|
|
888 |
return error;
|
|
|
889 |
}
|
|
|
890 |
|
|
|
891 |
|
|
|
892 |
/* process an inside corner, i.e. compute intersection */
|
|
|
893 |
static FT_Error
|
|
|
894 |
ft_stroker_inside( FT_Stroker stroker,
|
|
|
895 |
FT_Int side)
|
|
|
896 |
{
|
|
|
897 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
898 |
FT_Angle phi, theta, rotate;
|
|
|
899 |
FT_Fixed length, thcos, sigma;
|
|
|
900 |
FT_Vector delta;
|
|
|
901 |
FT_Error error = FT_Err_Ok;
|
|
|
902 |
|
|
|
903 |
|
|
|
904 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
905 |
|
|
|
906 |
/* compute median angle */
|
|
|
907 |
theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
|
|
|
908 |
if ( theta == FT_ANGLE_PI )
|
|
|
909 |
theta = rotate;
|
|
|
910 |
else
|
|
|
911 |
theta = theta / 2;
|
|
|
912 |
|
|
|
913 |
phi = stroker->angle_in + theta;
|
|
|
914 |
|
|
|
915 |
thcos = FT_Cos( theta );
|
|
|
916 |
sigma = FT_MulFix( stroker->miter_limit, thcos );
|
|
|
917 |
|
|
|
918 |
/* TODO: find better criterion to switch off the optimization */
|
|
|
919 |
if ( sigma < 0x10000L )
|
|
|
920 |
{
|
|
|
921 |
FT_Vector_From_Polar( &delta, stroker->radius,
|
|
|
922 |
stroker->angle_out + rotate );
|
|
|
923 |
delta.x += stroker->center.x;
|
|
|
924 |
delta.y += stroker->center.y;
|
|
|
925 |
border->movable = FALSE;
|
|
|
926 |
}
|
|
|
927 |
else
|
|
|
928 |
{
|
|
|
929 |
length = FT_DivFix( stroker->radius, thcos );
|
|
|
930 |
|
|
|
931 |
FT_Vector_From_Polar( &delta, length, phi + rotate );
|
|
|
932 |
delta.x += stroker->center.x;
|
|
|
933 |
delta.y += stroker->center.y;
|
|
|
934 |
}
|
|
|
935 |
|
|
|
936 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
937 |
|
|
|
938 |
return error;
|
|
|
939 |
}
|
|
|
940 |
|
|
|
941 |
|
|
|
942 |
/* process an outside corner, i.e. compute bevel/miter/round */
|
|
|
943 |
static FT_Error
|
|
|
944 |
ft_stroker_outside( FT_Stroker stroker,
|
|
|
945 |
FT_Int side )
|
|
|
946 |
{
|
|
|
947 |
FT_StrokeBorder border = stroker->borders + side;
|
|
|
948 |
FT_Error error;
|
|
|
949 |
FT_Angle rotate;
|
|
|
950 |
|
|
|
951 |
|
|
|
952 |
if ( stroker->line_join == FT_STROKER_LINEJOIN_ROUND )
|
|
|
953 |
error = ft_stroker_arcto( stroker, side );
|
|
|
954 |
else
|
|
|
955 |
{
|
|
|
956 |
/* this is a mitered or beveled corner */
|
|
|
957 |
FT_Fixed sigma, radius = stroker->radius;
|
|
|
958 |
FT_Angle theta, phi;
|
|
|
959 |
FT_Fixed thcos;
|
|
|
960 |
FT_Bool miter;
|
|
|
961 |
|
|
|
962 |
|
|
|
963 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
964 |
miter = FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_MITER );
|
|
|
965 |
|
|
|
966 |
theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
|
|
|
967 |
if ( theta == FT_ANGLE_PI )
|
|
|
968 |
{
|
|
|
969 |
theta = rotate;
|
|
|
970 |
phi = stroker->angle_in;
|
|
|
971 |
}
|
|
|
972 |
else
|
|
|
973 |
{
|
|
|
974 |
theta = theta / 2;
|
|
|
975 |
phi = stroker->angle_in + theta + rotate;
|
|
|
976 |
}
|
|
|
977 |
|
|
|
978 |
thcos = FT_Cos( theta );
|
|
|
979 |
sigma = FT_MulFix( stroker->miter_limit, thcos );
|
|
|
980 |
|
|
|
981 |
/* FT_Sin(x) = 0 for x <= 57 */
|
|
|
982 |
if ( sigma >= 0x10000L || ft_pos_abs( theta ) <= 57 )
|
|
|
983 |
miter = FALSE;
|
|
|
984 |
|
|
|
985 |
if ( miter ) /* this is a miter (broken angle) */
|
|
|
986 |
{
|
|
|
987 |
FT_Vector middle, delta;
|
|
|
988 |
FT_Fixed length;
|
|
|
989 |
|
|
|
990 |
|
|
|
991 |
/* compute middle point */
|
|
|
992 |
FT_Vector_From_Polar( &middle,
|
|
|
993 |
FT_MulFix( radius, stroker->miter_limit ),
|
|
|
994 |
phi );
|
|
|
995 |
middle.x += stroker->center.x;
|
|
|
996 |
middle.y += stroker->center.y;
|
|
|
997 |
|
|
|
998 |
/* compute first angle point */
|
|
|
999 |
length = FT_MulFix( radius,
|
|
|
1000 |
FT_DivFix( 0x10000L - sigma,
|
|
|
1001 |
ft_pos_abs( FT_Sin( theta ) ) ) );
|
|
|
1002 |
|
|
|
1003 |
FT_Vector_From_Polar( &delta, length, phi + rotate );
|
|
|
1004 |
delta.x += middle.x;
|
|
|
1005 |
delta.y += middle.y;
|
|
|
1006 |
|
|
|
1007 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1008 |
if ( error )
|
|
|
1009 |
goto Exit;
|
|
|
1010 |
|
|
|
1011 |
/* compute second angle point */
|
|
|
1012 |
FT_Vector_From_Polar( &delta, length, phi - rotate );
|
|
|
1013 |
delta.x += middle.x;
|
|
|
1014 |
delta.y += middle.y;
|
|
|
1015 |
|
|
|
1016 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1017 |
if ( error )
|
|
|
1018 |
goto Exit;
|
|
|
1019 |
|
|
|
1020 |
/* finally, add a movable end point */
|
|
|
1021 |
FT_Vector_From_Polar( &delta, radius, stroker->angle_out + rotate );
|
|
|
1022 |
delta.x += stroker->center.x;
|
|
|
1023 |
delta.y += stroker->center.y;
|
|
|
1024 |
|
|
|
1025 |
error = ft_stroke_border_lineto( border, &delta, TRUE );
|
|
|
1026 |
}
|
|
|
1027 |
|
|
|
1028 |
else /* this is a bevel (intersection) */
|
|
|
1029 |
{
|
|
|
1030 |
FT_Fixed length;
|
|
|
1031 |
FT_Vector delta;
|
|
|
1032 |
|
|
|
1033 |
|
|
|
1034 |
length = FT_DivFix( stroker->radius, thcos );
|
|
|
1035 |
|
|
|
1036 |
FT_Vector_From_Polar( &delta, length, phi );
|
|
|
1037 |
delta.x += stroker->center.x;
|
|
|
1038 |
delta.y += stroker->center.y;
|
|
|
1039 |
|
|
|
1040 |
error = ft_stroke_border_lineto( border, &delta, FALSE );
|
|
|
1041 |
if ( error )
|
|
|
1042 |
goto Exit;
|
|
|
1043 |
|
|
|
1044 |
/* now add end point */
|
|
|
1045 |
FT_Vector_From_Polar( &delta, stroker->radius,
|
|
|
1046 |
stroker->angle_out + rotate );
|
|
|
1047 |
delta.x += stroker->center.x;
|
|
|
1048 |
delta.y += stroker->center.y;
|
|
|
1049 |
|
|
|
1050 |
error = ft_stroke_border_lineto( border, &delta, TRUE );
|
|
|
1051 |
}
|
|
|
1052 |
}
|
|
|
1053 |
|
|
|
1054 |
Exit:
|
|
|
1055 |
return error;
|
|
|
1056 |
}
|
|
|
1057 |
|
|
|
1058 |
|
|
|
1059 |
static FT_Error
|
|
|
1060 |
ft_stroker_process_corner( FT_Stroker stroker )
|
|
|
1061 |
{
|
|
|
1062 |
FT_Error error = FT_Err_Ok;
|
|
|
1063 |
FT_Angle turn;
|
|
|
1064 |
FT_Int inside_side;
|
|
|
1065 |
|
|
|
1066 |
|
|
|
1067 |
turn = FT_Angle_Diff( stroker->angle_in, stroker->angle_out );
|
|
|
1068 |
|
|
|
1069 |
/* no specific corner processing is required if the turn is 0 */
|
|
|
1070 |
if ( turn == 0 )
|
|
|
1071 |
goto Exit;
|
|
|
1072 |
|
|
|
1073 |
/* when we turn to the right, the inside side is 0 */
|
|
|
1074 |
inside_side = 0;
|
|
|
1075 |
|
|
|
1076 |
/* otherwise, the inside side is 1 */
|
|
|
1077 |
if ( turn < 0 )
|
|
|
1078 |
inside_side = 1;
|
|
|
1079 |
|
|
|
1080 |
/* process the inside side */
|
|
|
1081 |
error = ft_stroker_inside( stroker, inside_side );
|
|
|
1082 |
if ( error )
|
|
|
1083 |
goto Exit;
|
|
|
1084 |
|
|
|
1085 |
/* process the outside side */
|
|
|
1086 |
error = ft_stroker_outside( stroker, 1 - inside_side );
|
|
|
1087 |
|
|
|
1088 |
Exit:
|
|
|
1089 |
return error;
|
|
|
1090 |
}
|
|
|
1091 |
|
|
|
1092 |
|
|
|
1093 |
/* add two points to the left and right borders corresponding to the */
|
|
|
1094 |
/* start of the subpath */
|
|
|
1095 |
static FT_Error
|
|
|
1096 |
ft_stroker_subpath_start( FT_Stroker stroker,
|
|
|
1097 |
FT_Angle start_angle )
|
|
|
1098 |
{
|
|
|
1099 |
FT_Vector delta;
|
|
|
1100 |
FT_Vector point;
|
|
|
1101 |
FT_Error error;
|
|
|
1102 |
FT_StrokeBorder border;
|
|
|
1103 |
|
|
|
1104 |
|
|
|
1105 |
FT_Vector_From_Polar( &delta, stroker->radius,
|
|
|
1106 |
start_angle + FT_ANGLE_PI2 );
|
|
|
1107 |
|
|
|
1108 |
point.x = stroker->center.x + delta.x;
|
|
|
1109 |
point.y = stroker->center.y + delta.y;
|
|
|
1110 |
|
|
|
1111 |
border = stroker->borders;
|
|
|
1112 |
error = ft_stroke_border_moveto( border, &point );
|
|
|
1113 |
if ( error )
|
|
|
1114 |
goto Exit;
|
|
|
1115 |
|
|
|
1116 |
point.x = stroker->center.x - delta.x;
|
|
|
1117 |
point.y = stroker->center.y - delta.y;
|
|
|
1118 |
|
|
|
1119 |
border++;
|
|
|
1120 |
error = ft_stroke_border_moveto( border, &point );
|
|
|
1121 |
|
|
|
1122 |
/* save angle for last cap */
|
|
|
1123 |
stroker->subpath_angle = start_angle;
|
|
|
1124 |
stroker->first_point = FALSE;
|
|
|
1125 |
|
|
|
1126 |
Exit:
|
|
|
1127 |
return error;
|
|
|
1128 |
}
|
|
|
1129 |
|
|
|
1130 |
|
|
|
1131 |
/* documentation is in ftstroke.h */
|
|
|
1132 |
|
|
|
1133 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1134 |
FT_Stroker_LineTo( FT_Stroker stroker,
|
|
|
1135 |
FT_Vector* to )
|
|
|
1136 |
{
|
|
|
1137 |
FT_Error error = FT_Err_Ok;
|
|
|
1138 |
FT_StrokeBorder border;
|
|
|
1139 |
FT_Vector delta;
|
|
|
1140 |
FT_Angle angle;
|
|
|
1141 |
FT_Int side;
|
|
|
1142 |
|
|
|
1143 |
delta.x = to->x - stroker->center.x;
|
|
|
1144 |
delta.y = to->y - stroker->center.y;
|
|
|
1145 |
|
|
|
1146 |
angle = FT_Atan2( delta.x, delta.y );
|
|
|
1147 |
FT_Vector_From_Polar( &delta, stroker->radius, angle + FT_ANGLE_PI2 );
|
|
|
1148 |
|
|
|
1149 |
/* process corner if necessary */
|
|
|
1150 |
if ( stroker->first_point )
|
|
|
1151 |
{
|
|
|
1152 |
/* This is the first segment of a subpath. We need to */
|
|
|
1153 |
/* add a point to each border at their respective starting */
|
|
|
1154 |
/* point locations. */
|
|
|
1155 |
error = ft_stroker_subpath_start( stroker, angle );
|
|
|
1156 |
if ( error )
|
|
|
1157 |
goto Exit;
|
|
|
1158 |
}
|
|
|
1159 |
else
|
|
|
1160 |
{
|
|
|
1161 |
/* process the current corner */
|
|
|
1162 |
stroker->angle_out = angle;
|
|
|
1163 |
error = ft_stroker_process_corner( stroker );
|
|
|
1164 |
if ( error )
|
|
|
1165 |
goto Exit;
|
|
|
1166 |
}
|
|
|
1167 |
|
|
|
1168 |
/* now add a line segment to both the `inside' and `outside' paths */
|
|
|
1169 |
|
|
|
1170 |
for ( border = stroker->borders, side = 1; side >= 0; side--, border++ )
|
|
|
1171 |
{
|
|
|
1172 |
FT_Vector point;
|
|
|
1173 |
|
|
|
1174 |
|
|
|
1175 |
point.x = to->x + delta.x;
|
|
|
1176 |
point.y = to->y + delta.y;
|
|
|
1177 |
|
|
|
1178 |
error = ft_stroke_border_lineto( border, &point, TRUE );
|
|
|
1179 |
if ( error )
|
|
|
1180 |
goto Exit;
|
|
|
1181 |
|
|
|
1182 |
delta.x = -delta.x;
|
|
|
1183 |
delta.y = -delta.y;
|
|
|
1184 |
}
|
|
|
1185 |
|
|
|
1186 |
stroker->angle_in = angle;
|
|
|
1187 |
stroker->center = *to;
|
|
|
1188 |
|
|
|
1189 |
Exit:
|
|
|
1190 |
return error;
|
|
|
1191 |
}
|
|
|
1192 |
|
|
|
1193 |
|
|
|
1194 |
/* documentation is in ftstroke.h */
|
|
|
1195 |
|
|
|
1196 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1197 |
FT_Stroker_ConicTo( FT_Stroker stroker,
|
|
|
1198 |
FT_Vector* control,
|
|
|
1199 |
FT_Vector* to )
|
|
|
1200 |
{
|
|
|
1201 |
FT_Error error = FT_Err_Ok;
|
|
|
1202 |
FT_Vector bez_stack[34];
|
|
|
1203 |
FT_Vector* arc;
|
|
|
1204 |
FT_Vector* limit = bez_stack + 30;
|
|
|
1205 |
FT_Angle start_angle;
|
|
|
1206 |
FT_Bool first_arc = TRUE;
|
|
|
1207 |
|
|
|
1208 |
|
|
|
1209 |
arc = bez_stack;
|
|
|
1210 |
arc[0] = *to;
|
|
|
1211 |
arc[1] = *control;
|
|
|
1212 |
arc[2] = stroker->center;
|
|
|
1213 |
|
|
|
1214 |
while ( arc >= bez_stack )
|
|
|
1215 |
{
|
|
|
1216 |
FT_Angle angle_in, angle_out;
|
|
|
1217 |
|
|
|
1218 |
|
|
|
1219 |
angle_in = angle_out = 0; /* remove compiler warnings */
|
|
|
1220 |
|
|
|
1221 |
if ( arc < limit &&
|
|
|
1222 |
!ft_conic_is_small_enough( arc, &angle_in, &angle_out ) )
|
|
|
1223 |
{
|
|
|
1224 |
ft_conic_split( arc );
|
|
|
1225 |
arc += 2;
|
|
|
1226 |
continue;
|
|
|
1227 |
}
|
|
|
1228 |
|
|
|
1229 |
if ( first_arc )
|
|
|
1230 |
{
|
|
|
1231 |
first_arc = FALSE;
|
|
|
1232 |
|
|
|
1233 |
start_angle = angle_in;
|
|
|
1234 |
|
|
|
1235 |
/* process corner if necessary */
|
|
|
1236 |
if ( stroker->first_point )
|
|
|
1237 |
error = ft_stroker_subpath_start( stroker, start_angle );
|
|
|
1238 |
else
|
|
|
1239 |
{
|
|
|
1240 |
stroker->angle_out = start_angle;
|
|
|
1241 |
error = ft_stroker_process_corner( stroker );
|
|
|
1242 |
}
|
|
|
1243 |
}
|
|
|
1244 |
|
|
|
1245 |
/* the arc's angle is small enough; we can add it directly to each */
|
|
|
1246 |
/* border */
|
|
|
1247 |
{
|
|
|
1248 |
FT_Vector ctrl, end;
|
|
|
1249 |
FT_Angle theta, phi, rotate;
|
|
|
1250 |
FT_Fixed length;
|
|
|
1251 |
FT_Int side;
|
|
|
1252 |
|
|
|
1253 |
|
|
|
1254 |
theta = FT_Angle_Diff( angle_in, angle_out ) / 2;
|
|
|
1255 |
phi = angle_in + theta;
|
|
|
1256 |
length = FT_DivFix( stroker->radius, FT_Cos( theta ) );
|
|
|
1257 |
|
|
|
1258 |
for ( side = 0; side <= 1; side++ )
|
|
|
1259 |
{
|
|
|
1260 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
1261 |
|
|
|
1262 |
/* compute control point */
|
|
|
1263 |
FT_Vector_From_Polar( &ctrl, length, phi + rotate );
|
|
|
1264 |
ctrl.x += arc[1].x;
|
|
|
1265 |
ctrl.y += arc[1].y;
|
|
|
1266 |
|
|
|
1267 |
/* compute end point */
|
|
|
1268 |
FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );
|
|
|
1269 |
end.x += arc[0].x;
|
|
|
1270 |
end.y += arc[0].y;
|
|
|
1271 |
|
|
|
1272 |
error = ft_stroke_border_conicto( stroker->borders + side,
|
|
|
1273 |
&ctrl, &end );
|
|
|
1274 |
if ( error )
|
|
|
1275 |
goto Exit;
|
|
|
1276 |
}
|
|
|
1277 |
}
|
|
|
1278 |
|
|
|
1279 |
arc -= 2;
|
|
|
1280 |
|
|
|
1281 |
if ( arc < bez_stack )
|
|
|
1282 |
stroker->angle_in = angle_out;
|
|
|
1283 |
}
|
|
|
1284 |
|
|
|
1285 |
stroker->center = *to;
|
|
|
1286 |
|
|
|
1287 |
Exit:
|
|
|
1288 |
return error;
|
|
|
1289 |
}
|
|
|
1290 |
|
|
|
1291 |
|
|
|
1292 |
/* documentation is in ftstroke.h */
|
|
|
1293 |
|
|
|
1294 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1295 |
FT_Stroker_CubicTo( FT_Stroker stroker,
|
|
|
1296 |
FT_Vector* control1,
|
|
|
1297 |
FT_Vector* control2,
|
|
|
1298 |
FT_Vector* to )
|
|
|
1299 |
{
|
|
|
1300 |
FT_Error error = FT_Err_Ok;
|
|
|
1301 |
FT_Vector bez_stack[37];
|
|
|
1302 |
FT_Vector* arc;
|
|
|
1303 |
FT_Vector* limit = bez_stack + 32;
|
|
|
1304 |
FT_Angle start_angle;
|
|
|
1305 |
FT_Bool first_arc = TRUE;
|
|
|
1306 |
|
|
|
1307 |
|
|
|
1308 |
arc = bez_stack;
|
|
|
1309 |
arc[0] = *to;
|
|
|
1310 |
arc[1] = *control2;
|
|
|
1311 |
arc[2] = *control1;
|
|
|
1312 |
arc[3] = stroker->center;
|
|
|
1313 |
|
|
|
1314 |
while ( arc >= bez_stack )
|
|
|
1315 |
{
|
|
|
1316 |
FT_Angle angle_in, angle_mid, angle_out;
|
|
|
1317 |
|
|
|
1318 |
|
|
|
1319 |
/* remove compiler warnings */
|
|
|
1320 |
angle_in = angle_out = angle_mid = 0;
|
|
|
1321 |
|
|
|
1322 |
if ( arc < limit &&
|
|
|
1323 |
!ft_cubic_is_small_enough( arc, &angle_in,
|
|
|
1324 |
&angle_mid, &angle_out ) )
|
|
|
1325 |
{
|
|
|
1326 |
ft_cubic_split( arc );
|
|
|
1327 |
arc += 3;
|
|
|
1328 |
continue;
|
|
|
1329 |
}
|
|
|
1330 |
|
|
|
1331 |
if ( first_arc )
|
|
|
1332 |
{
|
|
|
1333 |
first_arc = FALSE;
|
|
|
1334 |
|
|
|
1335 |
/* process corner if necessary */
|
|
|
1336 |
start_angle = angle_in;
|
|
|
1337 |
|
|
|
1338 |
if ( stroker->first_point )
|
|
|
1339 |
error = ft_stroker_subpath_start( stroker, start_angle );
|
|
|
1340 |
else
|
|
|
1341 |
{
|
|
|
1342 |
stroker->angle_out = start_angle;
|
|
|
1343 |
error = ft_stroker_process_corner( stroker );
|
|
|
1344 |
}
|
|
|
1345 |
if ( error )
|
|
|
1346 |
goto Exit;
|
|
|
1347 |
}
|
|
|
1348 |
|
|
|
1349 |
/* the arc's angle is small enough; we can add it directly to each */
|
|
|
1350 |
/* border */
|
|
|
1351 |
{
|
|
|
1352 |
FT_Vector ctrl1, ctrl2, end;
|
|
|
1353 |
FT_Angle theta1, phi1, theta2, phi2, rotate;
|
|
|
1354 |
FT_Fixed length1, length2;
|
|
|
1355 |
FT_Int side;
|
|
|
1356 |
|
|
|
1357 |
|
|
|
1358 |
theta1 = ft_pos_abs( angle_mid - angle_in ) / 2;
|
|
|
1359 |
theta2 = ft_pos_abs( angle_out - angle_mid ) / 2;
|
|
|
1360 |
phi1 = (angle_mid + angle_in ) / 2;
|
|
|
1361 |
phi2 = (angle_mid + angle_out ) / 2;
|
|
|
1362 |
length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) );
|
|
|
1363 |
length2 = FT_DivFix( stroker->radius, FT_Cos( theta2 ) );
|
|
|
1364 |
|
|
|
1365 |
for ( side = 0; side <= 1; side++ )
|
|
|
1366 |
{
|
|
|
1367 |
rotate = FT_SIDE_TO_ROTATE( side );
|
|
|
1368 |
|
|
|
1369 |
/* compute control points */
|
|
|
1370 |
FT_Vector_From_Polar( &ctrl1, length1, phi1 + rotate );
|
|
|
1371 |
ctrl1.x += arc[2].x;
|
|
|
1372 |
ctrl1.y += arc[2].y;
|
|
|
1373 |
|
|
|
1374 |
FT_Vector_From_Polar( &ctrl2, length2, phi2 + rotate );
|
|
|
1375 |
ctrl2.x += arc[1].x;
|
|
|
1376 |
ctrl2.y += arc[1].y;
|
|
|
1377 |
|
|
|
1378 |
/* compute end point */
|
|
|
1379 |
FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate );
|
|
|
1380 |
end.x += arc[0].x;
|
|
|
1381 |
end.y += arc[0].y;
|
|
|
1382 |
|
|
|
1383 |
error = ft_stroke_border_cubicto( stroker->borders + side,
|
|
|
1384 |
&ctrl1, &ctrl2, &end );
|
|
|
1385 |
if ( error )
|
|
|
1386 |
goto Exit;
|
|
|
1387 |
}
|
|
|
1388 |
}
|
|
|
1389 |
|
|
|
1390 |
arc -= 3;
|
|
|
1391 |
if ( arc < bez_stack )
|
|
|
1392 |
stroker->angle_in = angle_out;
|
|
|
1393 |
}
|
|
|
1394 |
|
|
|
1395 |
stroker->center = *to;
|
|
|
1396 |
|
|
|
1397 |
Exit:
|
|
|
1398 |
return error;
|
|
|
1399 |
}
|
|
|
1400 |
|
|
|
1401 |
|
|
|
1402 |
/* documentation is in ftstroke.h */
|
|
|
1403 |
|
|
|
1404 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1405 |
FT_Stroker_BeginSubPath( FT_Stroker stroker,
|
|
|
1406 |
FT_Vector* to,
|
|
|
1407 |
FT_Bool open )
|
|
|
1408 |
{
|
|
|
1409 |
/* We cannot process the first point, because there is not enough */
|
|
|
1410 |
/* information regarding its corner/cap. The latter will be processed */
|
|
|
1411 |
/* in the `FT_Stroker_EndSubPath' routine. */
|
|
|
1412 |
/* */
|
|
|
1413 |
stroker->first_point = TRUE;
|
|
|
1414 |
stroker->center = *to;
|
|
|
1415 |
stroker->subpath_open = open;
|
|
|
1416 |
|
|
|
1417 |
/* record the subpath start point for each border */
|
|
|
1418 |
stroker->subpath_start = *to;
|
|
|
1419 |
|
|
|
1420 |
return FT_Err_Ok;
|
|
|
1421 |
}
|
|
|
1422 |
|
|
|
1423 |
|
|
|
1424 |
static FT_Error
|
|
|
1425 |
ft_stroker_add_reverse_left( FT_Stroker stroker,
|
|
|
1426 |
FT_Bool open )
|
|
|
1427 |
{
|
|
|
1428 |
FT_StrokeBorder right = stroker->borders + 0;
|
|
|
1429 |
FT_StrokeBorder left = stroker->borders + 1;
|
|
|
1430 |
FT_Int new_points;
|
|
|
1431 |
FT_Error error = FT_Err_Ok;
|
|
|
1432 |
|
|
|
1433 |
|
|
|
1434 |
FT_ASSERT( left->start >= 0 );
|
|
|
1435 |
|
|
|
1436 |
new_points = left->num_points - left->start;
|
|
|
1437 |
if ( new_points > 0 )
|
|
|
1438 |
{
|
|
|
1439 |
error = ft_stroke_border_grow( right, (FT_UInt)new_points );
|
|
|
1440 |
if ( error )
|
|
|
1441 |
goto Exit;
|
|
|
1442 |
|
|
|
1443 |
{
|
|
|
1444 |
FT_Vector* dst_point = right->points + right->num_points;
|
|
|
1445 |
FT_Byte* dst_tag = right->tags + right->num_points;
|
|
|
1446 |
FT_Vector* src_point = left->points + left->num_points - 1;
|
|
|
1447 |
FT_Byte* src_tag = left->tags + left->num_points - 1;
|
|
|
1448 |
|
|
|
1449 |
while ( src_point >= left->points + left->start )
|
|
|
1450 |
{
|
|
|
1451 |
*dst_point = *src_point;
|
|
|
1452 |
*dst_tag = *src_tag;
|
|
|
1453 |
|
|
|
1454 |
if ( open )
|
|
|
1455 |
dst_tag[0] &= ~FT_STROKE_TAG_BEGIN_END;
|
|
|
1456 |
else
|
|
|
1457 |
{
|
|
|
1458 |
FT_Byte ttag = (FT_Byte)( dst_tag[0] & FT_STROKE_TAG_BEGIN_END );
|
|
|
1459 |
|
|
|
1460 |
|
|
|
1461 |
/* switch begin/end tags if necessary */
|
|
|
1462 |
if ( ttag == FT_STROKE_TAG_BEGIN ||
|
|
|
1463 |
ttag == FT_STROKE_TAG_END )
|
|
|
1464 |
dst_tag[0] ^= FT_STROKE_TAG_BEGIN_END;
|
|
|
1465 |
|
|
|
1466 |
}
|
|
|
1467 |
|
|
|
1468 |
src_point--;
|
|
|
1469 |
src_tag--;
|
|
|
1470 |
dst_point++;
|
|
|
1471 |
dst_tag++;
|
|
|
1472 |
}
|
|
|
1473 |
}
|
|
|
1474 |
|
|
|
1475 |
left->num_points = left->start;
|
|
|
1476 |
right->num_points += new_points;
|
|
|
1477 |
|
|
|
1478 |
right->movable = FALSE;
|
|
|
1479 |
left->movable = FALSE;
|
|
|
1480 |
}
|
|
|
1481 |
|
|
|
1482 |
Exit:
|
|
|
1483 |
return error;
|
|
|
1484 |
}
|
|
|
1485 |
|
|
|
1486 |
|
|
|
1487 |
/* documentation is in ftstroke.h */
|
|
|
1488 |
|
|
|
1489 |
/* there's a lot of magic in this function! */
|
|
|
1490 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1491 |
FT_Stroker_EndSubPath( FT_Stroker stroker )
|
|
|
1492 |
{
|
|
|
1493 |
FT_Error error = FT_Err_Ok;
|
|
|
1494 |
|
|
|
1495 |
|
|
|
1496 |
if ( stroker->subpath_open )
|
|
|
1497 |
{
|
|
|
1498 |
FT_StrokeBorder right = stroker->borders;
|
|
|
1499 |
|
|
|
1500 |
/* All right, this is an opened path, we need to add a cap between */
|
|
|
1501 |
/* right & left, add the reverse of left, then add a final cap */
|
|
|
1502 |
/* between left & right. */
|
|
|
1503 |
error = ft_stroker_cap( stroker, stroker->angle_in, 0 );
|
|
|
1504 |
if ( error )
|
|
|
1505 |
goto Exit;
|
|
|
1506 |
|
|
|
1507 |
/* add reversed points from `left' to `right' */
|
|
|
1508 |
error = ft_stroker_add_reverse_left( stroker, TRUE );
|
|
|
1509 |
if ( error )
|
|
|
1510 |
goto Exit;
|
|
|
1511 |
|
|
|
1512 |
/* now add the final cap */
|
|
|
1513 |
stroker->center = stroker->subpath_start;
|
|
|
1514 |
error = ft_stroker_cap( stroker,
|
|
|
1515 |
stroker->subpath_angle + FT_ANGLE_PI, 0 );
|
|
|
1516 |
if ( error )
|
|
|
1517 |
goto Exit;
|
|
|
1518 |
|
|
|
1519 |
/* Now end the right subpath accordingly. The left one is */
|
|
|
1520 |
/* rewind and doesn't need further processing. */
|
|
|
1521 |
ft_stroke_border_close( right, FALSE );
|
|
|
1522 |
}
|
|
|
1523 |
else
|
|
|
1524 |
{
|
|
|
1525 |
FT_Angle turn;
|
|
|
1526 |
FT_Int inside_side;
|
|
|
1527 |
|
|
|
1528 |
/* close the path if needed */
|
|
|
1529 |
if ( stroker->center.x != stroker->subpath_start.x ||
|
|
|
1530 |
stroker->center.y != stroker->subpath_start.y )
|
|
|
1531 |
{
|
|
|
1532 |
error = FT_Stroker_LineTo( stroker, &stroker->subpath_start );
|
|
|
1533 |
if ( error )
|
|
|
1534 |
goto Exit;
|
|
|
1535 |
}
|
|
|
1536 |
|
|
|
1537 |
/* process the corner */
|
|
|
1538 |
stroker->angle_out = stroker->subpath_angle;
|
|
|
1539 |
turn = FT_Angle_Diff( stroker->angle_in,
|
|
|
1540 |
stroker->angle_out );
|
|
|
1541 |
|
|
|
1542 |
/* no specific corner processing is required if the turn is 0 */
|
|
|
1543 |
if ( turn != 0 )
|
|
|
1544 |
{
|
|
|
1545 |
/* when we turn to the right, the inside side is 0 */
|
|
|
1546 |
inside_side = 0;
|
|
|
1547 |
|
|
|
1548 |
/* otherwise, the inside side is 1 */
|
|
|
1549 |
if ( turn < 0 )
|
|
|
1550 |
inside_side = 1;
|
|
|
1551 |
|
|
|
1552 |
error = ft_stroker_inside( stroker, inside_side );
|
|
|
1553 |
if ( error )
|
|
|
1554 |
goto Exit;
|
|
|
1555 |
|
|
|
1556 |
/* process the outside side */
|
|
|
1557 |
error = ft_stroker_outside( stroker, 1 - inside_side );
|
|
|
1558 |
if ( error )
|
|
|
1559 |
goto Exit;
|
|
|
1560 |
}
|
|
|
1561 |
|
|
|
1562 |
/* then end our two subpaths */
|
|
|
1563 |
ft_stroke_border_close( stroker->borders + 0, TRUE );
|
|
|
1564 |
ft_stroke_border_close( stroker->borders + 1, FALSE );
|
|
|
1565 |
}
|
|
|
1566 |
|
|
|
1567 |
Exit:
|
|
|
1568 |
return error;
|
|
|
1569 |
}
|
|
|
1570 |
|
|
|
1571 |
|
|
|
1572 |
/* documentation is in ftstroke.h */
|
|
|
1573 |
|
|
|
1574 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1575 |
FT_Stroker_GetBorderCounts( FT_Stroker stroker,
|
|
|
1576 |
FT_StrokerBorder border,
|
|
|
1577 |
FT_UInt *anum_points,
|
|
|
1578 |
FT_UInt *anum_contours )
|
|
|
1579 |
{
|
|
|
1580 |
FT_UInt num_points = 0, num_contours = 0;
|
|
|
1581 |
FT_Error error;
|
|
|
1582 |
|
|
|
1583 |
|
|
|
1584 |
if ( !stroker || border > 1 )
|
|
|
1585 |
{
|
|
|
1586 |
error = FT_Err_Invalid_Argument;
|
|
|
1587 |
goto Exit;
|
|
|
1588 |
}
|
|
|
1589 |
|
|
|
1590 |
error = ft_stroke_border_get_counts( stroker->borders + border,
|
|
|
1591 |
&num_points, &num_contours );
|
|
|
1592 |
Exit:
|
|
|
1593 |
if ( anum_points )
|
|
|
1594 |
*anum_points = num_points;
|
|
|
1595 |
|
|
|
1596 |
if ( anum_contours )
|
|
|
1597 |
*anum_contours = num_contours;
|
|
|
1598 |
|
|
|
1599 |
return error;
|
|
|
1600 |
}
|
|
|
1601 |
|
|
|
1602 |
|
|
|
1603 |
/* documentation is in ftstroke.h */
|
|
|
1604 |
|
|
|
1605 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1606 |
FT_Stroker_GetCounts( FT_Stroker stroker,
|
|
|
1607 |
FT_UInt *anum_points,
|
|
|
1608 |
FT_UInt *anum_contours )
|
|
|
1609 |
{
|
|
|
1610 |
FT_UInt count1, count2, num_points = 0;
|
|
|
1611 |
FT_UInt count3, count4, num_contours = 0;
|
|
|
1612 |
FT_Error error;
|
|
|
1613 |
|
|
|
1614 |
|
|
|
1615 |
error = ft_stroke_border_get_counts( stroker->borders + 0,
|
|
|
1616 |
&count1, &count2 );
|
|
|
1617 |
if ( error )
|
|
|
1618 |
goto Exit;
|
|
|
1619 |
|
|
|
1620 |
error = ft_stroke_border_get_counts( stroker->borders + 1,
|
|
|
1621 |
&count3, &count4 );
|
|
|
1622 |
if ( error )
|
|
|
1623 |
goto Exit;
|
|
|
1624 |
|
|
|
1625 |
num_points = count1 + count3;
|
|
|
1626 |
num_contours = count2 + count4;
|
|
|
1627 |
|
|
|
1628 |
Exit:
|
|
|
1629 |
*anum_points = num_points;
|
|
|
1630 |
*anum_contours = num_contours;
|
|
|
1631 |
return error;
|
|
|
1632 |
}
|
|
|
1633 |
|
|
|
1634 |
|
|
|
1635 |
/* documentation is in ftstroke.h */
|
|
|
1636 |
|
|
|
1637 |
FT_EXPORT_DEF( void )
|
|
|
1638 |
FT_Stroker_ExportBorder( FT_Stroker stroker,
|
|
|
1639 |
FT_StrokerBorder border,
|
|
|
1640 |
FT_Outline* outline )
|
|
|
1641 |
{
|
|
|
1642 |
if ( border == FT_STROKER_BORDER_LEFT ||
|
|
|
1643 |
border == FT_STROKER_BORDER_RIGHT )
|
|
|
1644 |
{
|
|
|
1645 |
FT_StrokeBorder sborder = & stroker->borders[border];
|
|
|
1646 |
|
|
|
1647 |
|
|
|
1648 |
if ( sborder->valid )
|
|
|
1649 |
ft_stroke_border_export( sborder, outline );
|
|
|
1650 |
}
|
|
|
1651 |
}
|
|
|
1652 |
|
|
|
1653 |
|
|
|
1654 |
/* documentation is in ftstroke.h */
|
|
|
1655 |
|
|
|
1656 |
FT_EXPORT_DEF( void )
|
|
|
1657 |
FT_Stroker_Export( FT_Stroker stroker,
|
|
|
1658 |
FT_Outline* outline )
|
|
|
1659 |
{
|
|
|
1660 |
FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_LEFT, outline );
|
|
|
1661 |
FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_RIGHT, outline );
|
|
|
1662 |
}
|
|
|
1663 |
|
|
|
1664 |
|
|
|
1665 |
/* documentation is in ftstroke.h */
|
|
|
1666 |
|
|
|
1667 |
/*
|
|
|
1668 |
* The following is very similar to FT_Outline_Decompose, except
|
|
|
1669 |
* that we do support opened paths, and do not scale the outline.
|
|
|
1670 |
*/
|
|
|
1671 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1672 |
FT_Stroker_ParseOutline( FT_Stroker stroker,
|
|
|
1673 |
FT_Outline* outline,
|
|
|
1674 |
FT_Bool opened )
|
|
|
1675 |
{
|
|
|
1676 |
FT_Vector v_last;
|
|
|
1677 |
FT_Vector v_control;
|
|
|
1678 |
FT_Vector v_start;
|
|
|
1679 |
|
|
|
1680 |
FT_Vector* point;
|
|
|
1681 |
FT_Vector* limit;
|
|
|
1682 |
char* tags;
|
|
|
1683 |
|
|
|
1684 |
FT_Error error;
|
|
|
1685 |
|
|
|
1686 |
FT_Int n; /* index of contour in outline */
|
|
|
1687 |
FT_UInt first; /* index of first point in contour */
|
|
|
1688 |
FT_Int tag; /* current point's state */
|
|
|
1689 |
|
|
|
1690 |
|
|
|
1691 |
if ( !outline || !stroker )
|
|
|
1692 |
return FT_Err_Invalid_Argument;
|
|
|
1693 |
|
|
|
1694 |
FT_Stroker_Rewind( stroker );
|
|
|
1695 |
|
|
|
1696 |
first = 0;
|
|
|
1697 |
|
|
|
1698 |
for ( n = 0; n < outline->n_contours; n++ )
|
|
|
1699 |
{
|
|
|
1700 |
FT_UInt last; /* index of last point in contour */
|
|
|
1701 |
|
|
|
1702 |
|
|
|
1703 |
last = outline->contours[n];
|
|
|
1704 |
limit = outline->points + last;
|
|
|
1705 |
|
|
|
1706 |
/* skip empty points; we don't stroke these */
|
|
|
1707 |
if ( last <= first )
|
|
|
1708 |
{
|
|
|
1709 |
first = last + 1;
|
|
|
1710 |
continue;
|
|
|
1711 |
}
|
|
|
1712 |
|
|
|
1713 |
v_start = outline->points[first];
|
|
|
1714 |
v_last = outline->points[last];
|
|
|
1715 |
|
|
|
1716 |
v_control = v_start;
|
|
|
1717 |
|
|
|
1718 |
point = outline->points + first;
|
|
|
1719 |
tags = outline->tags + first;
|
|
|
1720 |
tag = FT_CURVE_TAG( tags[0] );
|
|
|
1721 |
|
|
|
1722 |
/* A contour cannot start with a cubic control point! */
|
|
|
1723 |
if ( tag == FT_CURVE_TAG_CUBIC )
|
|
|
1724 |
goto Invalid_Outline;
|
|
|
1725 |
|
|
|
1726 |
/* check first point to determine origin */
|
|
|
1727 |
if ( tag == FT_CURVE_TAG_CONIC )
|
|
|
1728 |
{
|
|
|
1729 |
/* First point is conic control. Yes, this happens. */
|
|
|
1730 |
if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )
|
|
|
1731 |
{
|
|
|
1732 |
/* start at last point if it is on the curve */
|
|
|
1733 |
v_start = v_last;
|
|
|
1734 |
limit--;
|
|
|
1735 |
}
|
|
|
1736 |
else
|
|
|
1737 |
{
|
|
|
1738 |
/* if both first and last points are conic, */
|
|
|
1739 |
/* start at their middle */
|
|
|
1740 |
v_start.x = ( v_start.x + v_last.x ) / 2;
|
|
|
1741 |
v_start.y = ( v_start.y + v_last.y ) / 2;
|
|
|
1742 |
}
|
|
|
1743 |
point--;
|
|
|
1744 |
tags--;
|
|
|
1745 |
}
|
|
|
1746 |
|
|
|
1747 |
error = FT_Stroker_BeginSubPath( stroker, &v_start, opened );
|
|
|
1748 |
if ( error )
|
|
|
1749 |
goto Exit;
|
|
|
1750 |
|
|
|
1751 |
while ( point < limit )
|
|
|
1752 |
{
|
|
|
1753 |
point++;
|
|
|
1754 |
tags++;
|
|
|
1755 |
|
|
|
1756 |
tag = FT_CURVE_TAG( tags[0] );
|
|
|
1757 |
switch ( tag )
|
|
|
1758 |
{
|
|
|
1759 |
case FT_CURVE_TAG_ON: /* emit a single line_to */
|
|
|
1760 |
{
|
|
|
1761 |
FT_Vector vec;
|
|
|
1762 |
|
|
|
1763 |
|
|
|
1764 |
vec.x = point->x;
|
|
|
1765 |
vec.y = point->y;
|
|
|
1766 |
|
|
|
1767 |
error = FT_Stroker_LineTo( stroker, &vec );
|
|
|
1768 |
if ( error )
|
|
|
1769 |
goto Exit;
|
|
|
1770 |
continue;
|
|
|
1771 |
}
|
|
|
1772 |
|
|
|
1773 |
case FT_CURVE_TAG_CONIC: /* consume conic arcs */
|
|
|
1774 |
v_control.x = point->x;
|
|
|
1775 |
v_control.y = point->y;
|
|
|
1776 |
|
|
|
1777 |
Do_Conic:
|
|
|
1778 |
if ( point < limit )
|
|
|
1779 |
{
|
|
|
1780 |
FT_Vector vec;
|
|
|
1781 |
FT_Vector v_middle;
|
|
|
1782 |
|
|
|
1783 |
|
|
|
1784 |
point++;
|
|
|
1785 |
tags++;
|
|
|
1786 |
tag = FT_CURVE_TAG( tags[0] );
|
|
|
1787 |
|
|
|
1788 |
vec = point[0];
|
|
|
1789 |
|
|
|
1790 |
if ( tag == FT_CURVE_TAG_ON )
|
|
|
1791 |
{
|
|
|
1792 |
error = FT_Stroker_ConicTo( stroker, &v_control, &vec );
|
|
|
1793 |
if ( error )
|
|
|
1794 |
goto Exit;
|
|
|
1795 |
continue;
|
|
|
1796 |
}
|
|
|
1797 |
|
|
|
1798 |
if ( tag != FT_CURVE_TAG_CONIC )
|
|
|
1799 |
goto Invalid_Outline;
|
|
|
1800 |
|
|
|
1801 |
v_middle.x = ( v_control.x + vec.x ) / 2;
|
|
|
1802 |
v_middle.y = ( v_control.y + vec.y ) / 2;
|
|
|
1803 |
|
|
|
1804 |
error = FT_Stroker_ConicTo( stroker, &v_control, &v_middle );
|
|
|
1805 |
if ( error )
|
|
|
1806 |
goto Exit;
|
|
|
1807 |
|
|
|
1808 |
v_control = vec;
|
|
|
1809 |
goto Do_Conic;
|
|
|
1810 |
}
|
|
|
1811 |
|
|
|
1812 |
error = FT_Stroker_ConicTo( stroker, &v_control, &v_start );
|
|
|
1813 |
goto Close;
|
|
|
1814 |
|
|
|
1815 |
default: /* FT_CURVE_TAG_CUBIC */
|
|
|
1816 |
{
|
|
|
1817 |
FT_Vector vec1, vec2;
|
|
|
1818 |
|
|
|
1819 |
|
|
|
1820 |
if ( point + 1 > limit ||
|
|
|
1821 |
FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )
|
|
|
1822 |
goto Invalid_Outline;
|
|
|
1823 |
|
|
|
1824 |
point += 2;
|
|
|
1825 |
tags += 2;
|
|
|
1826 |
|
|
|
1827 |
vec1 = point[-2];
|
|
|
1828 |
vec2 = point[-1];
|
|
|
1829 |
|
|
|
1830 |
if ( point <= limit )
|
|
|
1831 |
{
|
|
|
1832 |
FT_Vector vec;
|
|
|
1833 |
|
|
|
1834 |
|
|
|
1835 |
vec = point[0];
|
|
|
1836 |
|
|
|
1837 |
error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &vec );
|
|
|
1838 |
if ( error )
|
|
|
1839 |
goto Exit;
|
|
|
1840 |
continue;
|
|
|
1841 |
}
|
|
|
1842 |
|
|
|
1843 |
error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &v_start );
|
|
|
1844 |
goto Close;
|
|
|
1845 |
}
|
|
|
1846 |
}
|
|
|
1847 |
}
|
|
|
1848 |
|
|
|
1849 |
Close:
|
|
|
1850 |
if ( error )
|
|
|
1851 |
goto Exit;
|
|
|
1852 |
|
|
|
1853 |
error = FT_Stroker_EndSubPath( stroker );
|
|
|
1854 |
if ( error )
|
|
|
1855 |
goto Exit;
|
|
|
1856 |
|
|
|
1857 |
first = last + 1;
|
|
|
1858 |
}
|
|
|
1859 |
|
|
|
1860 |
return FT_Err_Ok;
|
|
|
1861 |
|
|
|
1862 |
Exit:
|
|
|
1863 |
return error;
|
|
|
1864 |
|
|
|
1865 |
Invalid_Outline:
|
|
|
1866 |
return FT_Err_Invalid_Outline;
|
|
|
1867 |
}
|
|
|
1868 |
|
|
|
1869 |
/* declare an extern to access ft_outline_glyph_class global allocated
|
|
|
1870 |
in ftglyph.c, and use the FT_OUTLINE_GLYPH_CLASS_GET macro to access
|
|
|
1871 |
it when FT_CONFIG_OPTION_PIC is defined */
|
|
|
1872 |
#ifndef FT_CONFIG_OPTION_PIC
|
|
|
1873 |
extern const FT_Glyph_Class ft_outline_glyph_class;
|
|
|
1874 |
#endif
|
|
|
1875 |
#include "basepic.h"
|
|
|
1876 |
|
|
|
1877 |
|
|
|
1878 |
/* documentation is in ftstroke.h */
|
|
|
1879 |
|
|
|
1880 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1881 |
FT_Glyph_Stroke( FT_Glyph *pglyph,
|
|
|
1882 |
FT_Stroker stroker,
|
|
|
1883 |
FT_Bool destroy )
|
|
|
1884 |
{
|
|
|
1885 |
FT_Error error = FT_Err_Invalid_Argument;
|
|
|
1886 |
FT_Glyph glyph = NULL;
|
|
|
1887 |
FT_Library library = stroker->library;
|
|
|
1888 |
FT_UNUSED(library);
|
|
|
1889 |
|
|
|
1890 |
if ( pglyph == NULL )
|
|
|
1891 |
goto Exit;
|
|
|
1892 |
|
|
|
1893 |
glyph = *pglyph;
|
|
|
1894 |
if ( glyph == NULL || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET )
|
|
|
1895 |
goto Exit;
|
|
|
1896 |
|
|
|
1897 |
{
|
|
|
1898 |
FT_Glyph copy;
|
|
|
1899 |
|
|
|
1900 |
|
|
|
1901 |
error = FT_Glyph_Copy( glyph, © );
|
|
|
1902 |
if ( error )
|
|
|
1903 |
goto Exit;
|
|
|
1904 |
|
|
|
1905 |
glyph = copy;
|
|
|
1906 |
}
|
|
|
1907 |
|
|
|
1908 |
{
|
|
|
1909 |
FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph;
|
|
|
1910 |
FT_Outline* outline = &oglyph->outline;
|
|
|
1911 |
FT_UInt num_points, num_contours;
|
|
|
1912 |
|
|
|
1913 |
|
|
|
1914 |
error = FT_Stroker_ParseOutline( stroker, outline, FALSE );
|
|
|
1915 |
if ( error )
|
|
|
1916 |
goto Fail;
|
|
|
1917 |
|
|
|
1918 |
(void)FT_Stroker_GetCounts( stroker, &num_points, &num_contours );
|
|
|
1919 |
|
|
|
1920 |
FT_Outline_Done( glyph->library, outline );
|
|
|
1921 |
|
|
|
1922 |
error = FT_Outline_New( glyph->library,
|
|
|
1923 |
num_points, num_contours, outline );
|
|
|
1924 |
if ( error )
|
|
|
1925 |
goto Fail;
|
|
|
1926 |
|
|
|
1927 |
outline->n_points = 0;
|
|
|
1928 |
outline->n_contours = 0;
|
|
|
1929 |
|
|
|
1930 |
FT_Stroker_Export( stroker, outline );
|
|
|
1931 |
}
|
|
|
1932 |
|
|
|
1933 |
if ( destroy )
|
|
|
1934 |
FT_Done_Glyph( *pglyph );
|
|
|
1935 |
|
|
|
1936 |
*pglyph = glyph;
|
|
|
1937 |
goto Exit;
|
|
|
1938 |
|
|
|
1939 |
Fail:
|
|
|
1940 |
FT_Done_Glyph( glyph );
|
|
|
1941 |
glyph = NULL;
|
|
|
1942 |
|
|
|
1943 |
if ( !destroy )
|
|
|
1944 |
*pglyph = NULL;
|
|
|
1945 |
|
|
|
1946 |
Exit:
|
|
|
1947 |
return error;
|
|
|
1948 |
}
|
|
|
1949 |
|
|
|
1950 |
|
|
|
1951 |
/* documentation is in ftstroke.h */
|
|
|
1952 |
|
|
|
1953 |
FT_EXPORT_DEF( FT_Error )
|
|
|
1954 |
FT_Glyph_StrokeBorder( FT_Glyph *pglyph,
|
|
|
1955 |
FT_Stroker stroker,
|
|
|
1956 |
FT_Bool inside,
|
|
|
1957 |
FT_Bool destroy )
|
|
|
1958 |
{
|
|
|
1959 |
FT_Error error = FT_Err_Invalid_Argument;
|
|
|
1960 |
FT_Glyph glyph = NULL;
|
|
|
1961 |
FT_Library library = stroker->library;
|
|
|
1962 |
FT_UNUSED(library);
|
|
|
1963 |
|
|
|
1964 |
if ( pglyph == NULL )
|
|
|
1965 |
goto Exit;
|
|
|
1966 |
|
|
|
1967 |
glyph = *pglyph;
|
|
|
1968 |
if ( glyph == NULL || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET )
|
|
|
1969 |
goto Exit;
|
|
|
1970 |
|
|
|
1971 |
{
|
|
|
1972 |
FT_Glyph copy;
|
|
|
1973 |
|
|
|
1974 |
|
|
|
1975 |
error = FT_Glyph_Copy( glyph, © );
|
|
|
1976 |
if ( error )
|
|
|
1977 |
goto Exit;
|
|
|
1978 |
|
|
|
1979 |
glyph = copy;
|
|
|
1980 |
}
|
|
|
1981 |
|
|
|
1982 |
{
|
|
|
1983 |
FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph;
|
|
|
1984 |
FT_StrokerBorder border;
|
|
|
1985 |
FT_Outline* outline = &oglyph->outline;
|
|
|
1986 |
FT_UInt num_points, num_contours;
|
|
|
1987 |
|
|
|
1988 |
|
|
|
1989 |
border = FT_Outline_GetOutsideBorder( outline );
|
|
|
1990 |
if ( inside )
|
|
|
1991 |
{
|
|
|
1992 |
if ( border == FT_STROKER_BORDER_LEFT )
|
|
|
1993 |
border = FT_STROKER_BORDER_RIGHT;
|
|
|
1994 |
else
|
|
|
1995 |
border = FT_STROKER_BORDER_LEFT;
|
|
|
1996 |
}
|
|
|
1997 |
|
|
|
1998 |
error = FT_Stroker_ParseOutline( stroker, outline, FALSE );
|
|
|
1999 |
if ( error )
|
|
|
2000 |
goto Fail;
|
|
|
2001 |
|
|
|
2002 |
(void)FT_Stroker_GetBorderCounts( stroker, border,
|
|
|
2003 |
&num_points, &num_contours );
|
|
|
2004 |
|
|
|
2005 |
FT_Outline_Done( glyph->library, outline );
|
|
|
2006 |
|
|
|
2007 |
error = FT_Outline_New( glyph->library,
|
|
|
2008 |
num_points,
|
|
|
2009 |
num_contours,
|
|
|
2010 |
outline );
|
|
|
2011 |
if ( error )
|
|
|
2012 |
goto Fail;
|
|
|
2013 |
|
|
|
2014 |
outline->n_points = 0;
|
|
|
2015 |
outline->n_contours = 0;
|
|
|
2016 |
|
|
|
2017 |
FT_Stroker_ExportBorder( stroker, border, outline );
|
|
|
2018 |
}
|
|
|
2019 |
|
|
|
2020 |
if ( destroy )
|
|
|
2021 |
FT_Done_Glyph( *pglyph );
|
|
|
2022 |
|
|
|
2023 |
*pglyph = glyph;
|
|
|
2024 |
goto Exit;
|
|
|
2025 |
|
|
|
2026 |
Fail:
|
|
|
2027 |
FT_Done_Glyph( glyph );
|
|
|
2028 |
glyph = NULL;
|
|
|
2029 |
|
|
|
2030 |
if ( !destroy )
|
|
|
2031 |
*pglyph = NULL;
|
|
|
2032 |
|
|
|
2033 |
Exit:
|
|
|
2034 |
return error;
|
|
|
2035 |
}
|
|
|
2036 |
|
|
|
2037 |
|
|
|
2038 |
/* END */
|