fttrigon.c File Reference

#include <ft2build.h>
#include <FT_INTERNAL_OBJECTS_H>
#include <FT_TRIGONOMETRY_H>

Go to the source code of this file.

Macros
#define	FT_SIGN_INT(x)   ( (x) >> ( FT_SIZEOF_INT * 8 - 1 ) )
#define	FT_SIGN_INT16(x)   ( (x) >> 15 )
#define	FT_SIGN_INT32(x)   ( (x) >> 31 )
#define	FT_SIGN_LONG(x)   ( (x) >> ( FT_SIZEOF_LONG * 8 - 1 ) )
#define	FT_TRIG_COSCALE   0x11616E8EUL
#define	FT_TRIG_MAX_ITERS   23
#define	FT_TRIG_SCALE   1166391785UL /* 0x4585BA38UL */

Functions
	FT_Angle_Diff (FT_Angle angle1, FT_Angle angle2)
	FT_Atan2 (FT_Fixed dx, FT_Fixed dy)
	FT_Cos (FT_Angle angle)
	FT_Sin (FT_Angle angle)
	FT_Tan (FT_Angle angle)
static FT_Fixed	ft_trig_downscale (FT_Fixed val)
static FT_Int	ft_trig_prenorm (FT_Vector *vec)
static void	ft_trig_pseudo_polarize (FT_Vector *vec)
static void	ft_trig_pseudo_rotate (FT_Vector *vec, FT_Angle theta)
	FT_Vector_From_Polar (FT_Vector *vec, FT_Fixed length, FT_Angle angle)
	FT_Vector_Length (FT_Vector *vec)
	FT_Vector_Polarize (FT_Vector *vec, FT_Fixed *length, FT_Angle *angle)
	FT_Vector_Rotate (FT_Vector *vec, FT_Angle angle)
	FT_Vector_Unit (FT_Vector *vec, FT_Angle angle)

Variables
static const FT_Fixed	ft_trig_arctan_table [24]

Macro Definition Documentation

#define FT_SIGN_INT

(

x

)

( (x) >> ( FT_SIZEOF_INT * 8 - 1 ) )

Definition at line 409 of file fttrigon.c.

#define FT_SIGN_INT16

(

x

)

( (x) >> 15 )

Definition at line 411 of file fttrigon.c.

#define FT_SIGN_INT32

(

x

)

( (x) >> 31 )

Definition at line 410 of file fttrigon.c.

#define FT_SIGN_LONG

(

x

)

( (x) >> ( FT_SIZEOF_LONG * 8 - 1 ) )

Definition at line 408 of file fttrigon.c.

Referenced by FT_Vector_Rotate().

#define FT_TRIG_COSCALE   0x11616E8EUL

Definition at line 25 of file fttrigon.c.

Referenced by FT_Cos(), FT_Tan(), and FT_Vector_Unit().

#define FT_TRIG_MAX_ITERS   23

Definition at line 28 of file fttrigon.c.

Referenced by ft_trig_pseudo_polarize(), and ft_trig_pseudo_rotate().

#define FT_TRIG_SCALE   1166391785UL /* 0x4585BA38UL */

Definition at line 39 of file fttrigon.c.

Referenced by ft_trig_downscale().

Function Documentation

FT_Angle_Diff	(	FT_Angle	angle1,
		FT_Angle	angle2
	)

Definition at line 529 of file fttrigon.c.

References FT_Angle, FT_ANGLE_2PI, and FT_ANGLE_PI.

Referenced by ft_angle_mean(), ft_conic_is_small_enough(), ft_cubic_is_small_enough(), FT_Outline_Embolden(), ft_stroker_arcto(), FT_Stroker_ConicTo(), FT_Stroker_CubicTo(), FT_Stroker_EndSubPath(), ft_stroker_inside(), ft_stroker_outside(), and ft_stroker_process_corner().

FT_Atan2	(	FT_Fixed	dx,
		FT_Fixed	dy
	)

Definition at line 374 of file fttrigon.c.

References ft_trig_prenorm(), ft_trig_pseudo_polarize(), FT_Vector_::x, and FT_Vector_::y.

Referenced by ft_conic_is_small_enough(), ft_cubic_is_small_enough(), FT_Outline_Embolden(), FT_Stroker_ConicTo(), FT_Stroker_CubicTo(), FT_Stroker_LineTo(), and test_atan2().

FT_Cos

(

FT_Angle

angle

)

Definition at line 333 of file fttrigon.c.

References FT_TRIG_COSCALE, ft_trig_pseudo_rotate(), FT_Vector_::x, and FT_Vector_::y.

Referenced by FT_Outline_Embolden(), FT_Sin(), ft_stroke_border_arcto(), FT_Stroker_ConicTo(), FT_Stroker_CubicTo(), ft_stroker_inside(), ft_stroker_outside(), and test_cos().

FT_Sin

(

FT_Angle

angle

)

Definition at line 349 of file fttrigon.c.

References FT_ANGLE_PI2, and FT_Cos().

Referenced by ft_stroke_border_arcto(), FT_Stroker_ConicTo(), FT_Stroker_CubicTo(), ft_stroker_outside(), and test_sin().

FT_Tan

(

FT_Angle

angle

)

Definition at line 358 of file fttrigon.c.

References FT_DivFix(), FT_TRIG_COSCALE, ft_trig_pseudo_rotate(), FT_Vector_::x, and FT_Vector_::y.

Referenced by ft_stroker_inside(), and test_tan().

static FT_Fixed ft_trig_downscale ( FT_Fixed  val )

static

Definition at line 65 of file fttrigon.c.

References FT_TRIG_SCALE, and cordic::hi.

Referenced by FT_Vector_Length(), FT_Vector_Polarize(), and FT_Vector_Rotate().

static FT_Int ft_trig_prenorm ( FT_Vector *  vec )

static

Definition at line 100 of file fttrigon.c.

References FT_Vector_::x, and FT_Vector_::y.

Referenced by FT_Atan2(), FT_Vector_Length(), FT_Vector_Polarize(), and FT_Vector_Rotate().

static void ft_trig_pseudo_polarize ( FT_Vector *  vec )

static

Definition at line 256 of file fttrigon.c.

References FT_ANGLE_PI2, FT_PAD_ROUND, ft_trig_arctan_table, FT_TRIG_MAX_ITERS, i, FT_Vector_::x, and FT_Vector_::y.

Referenced by FT_Atan2(), FT_Vector_Length(), and FT_Vector_Polarize().

static void ft_trig_pseudo_rotate ( FT_Vector *  vec, FT_Angle  theta  )

static

Definition at line 186 of file fttrigon.c.

References FT_ANGLE_PI, FT_ANGLE_PI2, ft_trig_arctan_table, FT_TRIG_MAX_ITERS, i, FT_Vector_::x, and FT_Vector_::y.

Referenced by FT_Cos(), FT_Tan(), FT_Vector_Rotate(), and FT_Vector_Unit().

FT_Vector_From_Polar	(	FT_Vector *	vec,
		FT_Fixed	length,
		FT_Angle	angle
	)

Definition at line 515 of file fttrigon.c.

References FT_Vector_Rotate().

Referenced by FT_Outline_Embolden(), ft_stroke_border_arcto(), ft_stroker_cap(), FT_Stroker_ConicTo(), FT_Stroker_CubicTo(), ft_stroker_inside(), FT_Stroker_LineTo(), ft_stroker_outside(), and ft_stroker_subpath_start().

FT_Vector_Length

(

FT_Vector *

vec

)

Definition at line 455 of file fttrigon.c.

References ft_trig_downscale(), ft_trig_prenorm(), ft_trig_pseudo_polarize(), vec, FT_Vector_::x, and FT_Vector_::y.

Referenced by FT_Stroker_ConicTo(), FT_Stroker_CubicTo(), FT_Stroker_LineTo(), and test_length().

FT_Vector_Polarize	(	FT_Vector *	vec,
		FT_Fixed *	length,
		FT_Angle *	angle
	)

Definition at line 489 of file fttrigon.c.

References ft_trig_downscale(), ft_trig_prenorm(), ft_trig_pseudo_polarize(), vec, FT_Vector_::x, and FT_Vector_::y.

FT_Vector_Rotate	(	FT_Vector *	vec,
		FT_Angle	angle
	)

Definition at line 417 of file fttrigon.c.

References FT_SIGN_LONG, ft_trig_downscale(), ft_trig_prenorm(), ft_trig_pseudo_rotate(), half, FT_Vector_::x, and FT_Vector_::y.

Referenced by FT_Vector_From_Polar(), and test_rotate().

FT_Vector_Unit	(	FT_Vector *	vec,
		FT_Angle	angle
	)

Definition at line 395 of file fttrigon.c.

References FT_TRIG_COSCALE, and ft_trig_pseudo_rotate().

Referenced by test_unit().

Variable Documentation

const FT_Fixed ft_trig_arctan_table[24]

static

Initial value:

=
  {
    4157273L, 2949120L, 1740967L, 919879L, 466945L, 234379L, 117304L,
    58666L, 29335L, 14668L, 7334L, 3667L, 1833L, 917L, 458L, 229L, 115L,
    57L, 29L, 14L, 7L, 4L, 2L, 1L
  }

Definition at line 31 of file fttrigon.c.

Referenced by ft_trig_pseudo_polarize(), and ft_trig_pseudo_rotate().