/**************************************************************************** * * ftstroke.c * * FreeType path stroker (body). * * Copyright (C) 2002-2023 by * David Turner, Robert Wilhelm, and Werner Lemberg. * * This file is part of the FreeType project, and may only be used, * modified, and distributed under the terms of the FreeType project * license, LICENSE.TXT. By continuing to use, modify, or distribute * this file you indicate that you have read the license and * understand and accept it fully. * */ #include <freetype/ftstroke.h> #include <freetype/fttrigon.h> #include <freetype/ftoutln.h> #include <freetype/internal/ftmemory.h> #include <freetype/internal/ftdebug.h> #include <freetype/internal/ftobjs.h> /* declare an extern to access `ft_outline_glyph_class' globally */ /* allocated in `ftglyph.c' */ FT_CALLBACK_TABLE const FT_Glyph_Class ft_outline_glyph_class; /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_StrokerBorder ) FT_Outline_GetInsideBorder( FT_Outline* outline ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_StrokerBorder ) FT_Outline_GetOutsideBorder( FT_Outline* outline ) { … } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** BEZIER COMPUTATIONS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ #define FT_SMALL_CONIC_THRESHOLD … #define FT_SMALL_CUBIC_THRESHOLD … #define FT_EPSILON … #define FT_IS_SMALL( x ) … static FT_Pos ft_pos_abs( FT_Pos x ) { … } static void ft_conic_split( FT_Vector* base ) { … } static FT_Bool ft_conic_is_small_enough( FT_Vector* base, FT_Angle *angle_in, FT_Angle *angle_out ) { … } static void ft_cubic_split( FT_Vector* base ) { … } /* Return the average of `angle1' and `angle2'. */ /* This gives correct result even if `angle1' and `angle2' */ /* have opposite signs. */ static FT_Angle ft_angle_mean( FT_Angle angle1, FT_Angle angle2 ) { … } static FT_Bool ft_cubic_is_small_enough( FT_Vector* base, FT_Angle *angle_in, FT_Angle *angle_mid, FT_Angle *angle_out ) { … } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** STROKE BORDERS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ FT_StrokeTags; #define FT_STROKE_TAG_BEGIN_END … FT_StrokeBorder; static FT_Error ft_stroke_border_grow( FT_StrokeBorder border, FT_UInt new_points ) { … } static void ft_stroke_border_close( FT_StrokeBorder border, FT_Bool reverse ) { … } static FT_Error ft_stroke_border_lineto( FT_StrokeBorder border, FT_Vector* to, FT_Bool movable ) { … } static FT_Error ft_stroke_border_conicto( FT_StrokeBorder border, FT_Vector* control, FT_Vector* to ) { … } static FT_Error ft_stroke_border_cubicto( FT_StrokeBorder border, FT_Vector* control1, FT_Vector* control2, FT_Vector* to ) { … } #define FT_ARC_CUBIC_ANGLE … static FT_Error ft_stroke_border_arcto( FT_StrokeBorder border, FT_Vector* center, FT_Fixed radius, FT_Angle angle_start, FT_Angle angle_diff ) { … } static FT_Error ft_stroke_border_moveto( FT_StrokeBorder border, FT_Vector* to ) { … } static void ft_stroke_border_init( FT_StrokeBorder border, FT_Memory memory ) { … } static void ft_stroke_border_reset( FT_StrokeBorder border ) { … } static void ft_stroke_border_done( FT_StrokeBorder border ) { … } static FT_Error ft_stroke_border_get_counts( FT_StrokeBorder border, FT_UInt *anum_points, FT_UInt *anum_contours ) { … } static void ft_stroke_border_export( FT_StrokeBorder border, FT_Outline* outline ) { … } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** STROKER *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ #define FT_SIDE_TO_ROTATE( s ) … FT_StrokerRec; /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_Error ) FT_Stroker_New( FT_Library library, FT_Stroker *astroker ) { … } /* 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 ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( void ) FT_Stroker_Rewind( FT_Stroker stroker ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( void ) FT_Stroker_Done( FT_Stroker stroker ) { … } /* create a circular arc at a corner or cap */ static FT_Error ft_stroker_arcto( FT_Stroker stroker, FT_Int side ) { … } /* add a cap at the end of an opened path */ static FT_Error ft_stroker_cap( FT_Stroker stroker, FT_Angle angle, FT_Int side ) { … } /* process an inside corner, i.e. compute intersection */ static FT_Error ft_stroker_inside( FT_Stroker stroker, FT_Int side, FT_Fixed line_length ) { … } /* process an outside corner, i.e. compute bevel/miter/round */ static FT_Error ft_stroker_outside( FT_Stroker stroker, FT_Int side, FT_Fixed line_length ) { … } static FT_Error ft_stroker_process_corner( FT_Stroker stroker, FT_Fixed line_length ) { … } /* add two points to the left and right borders corresponding to the */ /* start of the subpath */ static FT_Error ft_stroker_subpath_start( FT_Stroker stroker, FT_Angle start_angle, FT_Fixed line_length ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_Error ) FT_Stroker_LineTo( FT_Stroker stroker, FT_Vector* to ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_Error ) FT_Stroker_ConicTo( FT_Stroker stroker, FT_Vector* control, FT_Vector* to ) { … } /* 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 ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_Error ) FT_Stroker_BeginSubPath( FT_Stroker stroker, FT_Vector* to, FT_Bool open ) { … } static FT_Error ft_stroker_add_reverse_left( FT_Stroker stroker, FT_Bool open ) { … } /* 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 ) { … } /* 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 ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_Error ) FT_Stroker_GetCounts( FT_Stroker stroker, FT_UInt *anum_points, FT_UInt *anum_contours ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( void ) FT_Stroker_ExportBorder( FT_Stroker stroker, FT_StrokerBorder border, FT_Outline* outline ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( void ) FT_Stroker_Export( FT_Stroker stroker, FT_Outline* 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 ) { … } /* documentation is in ftstroke.h */ FT_EXPORT_DEF( FT_Error ) FT_Glyph_Stroke( FT_Glyph *pglyph, FT_Stroker stroker, FT_Bool destroy ) { … } /* 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 ) { … } /* END */
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