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Unified Diff: core/src/fxge/fx_freetype/fxft2.5.01/src/base/fttrigon.c

Issue 815103002: Update freetype to 2.5.4. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: Adjust GYP and GN Created 6 years ago
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Index: core/src/fxge/fx_freetype/fxft2.5.01/src/base/fttrigon.c
diff --git a/core/src/fxge/fx_freetype/fxft2.5.01/src/base/fttrigon.c b/core/src/fxge/fx_freetype/fxft2.5.01/src/base/fttrigon.c
deleted file mode 100644
index aae71f7087d656ffcc8444d2e3fc88b43c88e3f8..0000000000000000000000000000000000000000
--- a/core/src/fxge/fx_freetype/fxft2.5.01/src/base/fttrigon.c
+++ /dev/null
@@ -1,492 +0,0 @@
-/***************************************************************************/
-/* */
-/* fttrigon.c */
-/* */
-/* FreeType trigonometric functions (body). */
-/* */
-/* Copyright 2001-2005, 2012-2013 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. */
-/* */
-/***************************************************************************/
-
- /*************************************************************************/
- /* */
- /* This is a fixed-point CORDIC implementation of trigonometric */
- /* functions as well as transformations between Cartesian and polar */
- /* coordinates. The angles are represented as 16.16 fixed-point values */
- /* in degrees, i.e., the angular resolution is 2^-16 degrees. Note that */
- /* only vectors longer than 2^16*180/pi (or at least 22 bits) on a */
- /* discrete Cartesian grid can have the same or better angular */
- /* resolution. Therefore, to maintain this precision, some functions */
- /* require an interim upscaling of the vectors, whereas others operate */
- /* with 24-bit long vectors directly. */
- /* */
- /*************************************************************************/
-
-#include "../../include/ft2build.h"
-#include "../../include/freetype/internal/ftobjs.h"
-#include "../../include/freetype/internal/ftcalc.h"
-#include "../../include/freetype/fttrigon.h"
-
-
- /* the Cordic shrink factor 0.858785336480436 * 2^32 */
-#define FT_TRIG_SCALE 0xDBD95B16UL
-
- /* the highest bit in overflow-safe vector components, */
- /* MSB of 0.858785336480436 * sqrt(0.5) * 2^30 */
-#define FT_TRIG_SAFE_MSB 29
-
- /* this table was generated for FT_PI = 180L << 16, i.e. degrees */
-#define FT_TRIG_MAX_ITERS 23
-
- static const FT_Fixed
- ft_trig_arctan_table[] =
- {
- 1740967L, 919879L, 466945L, 234379L, 117304L, 58666L, 29335L,
- 14668L, 7334L, 3667L, 1833L, 917L, 458L, 229L, 115L,
- 57L, 29L, 14L, 7L, 4L, 2L, 1L
- };
-
-
-#ifdef FT_LONG64
-
- /* multiply a given value by the CORDIC shrink factor */
- static FT_Fixed
- ft_trig_downscale( FT_Fixed val )
- {
- FT_Fixed s;
- FT_Int64 v;
-
-
- s = val;
- val = FT_ABS( val );
-
- v = ( val * (FT_Int64)FT_TRIG_SCALE ) + 0x100000000UL;
- val = (FT_Fixed)( v >> 32 );
-
- return ( s >= 0 ) ? val : -val;
- }
-
-#else /* !FT_LONG64 */
-
- /* multiply a given value by the CORDIC shrink factor */
- static FT_Fixed
- ft_trig_downscale( FT_Fixed val )
- {
- FT_Fixed s;
- FT_UInt32 v1, v2, k1, k2, hi, lo1, lo2, lo3;
-
-
- s = val;
- val = FT_ABS( val );
-
- v1 = (FT_UInt32)val >> 16;
- v2 = (FT_UInt32)( val & 0xFFFFL );
-
- k1 = (FT_UInt32)FT_TRIG_SCALE >> 16; /* constant */
- k2 = (FT_UInt32)( FT_TRIG_SCALE & 0xFFFFL ); /* constant */
-
- hi = k1 * v1;
- lo1 = k1 * v2 + k2 * v1; /* can't overflow */
-
- lo2 = ( k2 * v2 ) >> 16;
- lo3 = FT_MAX( lo1, lo2 );
- lo1 += lo2;
-
- hi += lo1 >> 16;
- if ( lo1 < lo3 )
- hi += (FT_UInt32)0x10000UL;
-
- val = (FT_Fixed)hi;
-
- return ( s >= 0 ) ? val : -val;
- }
-
-#endif /* !FT_LONG64 */
-
-
- static FT_Int
- ft_trig_prenorm( FT_Vector* vec )
- {
- FT_Pos x, y;
- FT_Int shift;
-
-
- x = vec->x;
- y = vec->y;
-
- shift = FT_MSB( FT_ABS( x ) | FT_ABS( y ) );
-
- if ( shift <= FT_TRIG_SAFE_MSB )
- {
- shift = FT_TRIG_SAFE_MSB - shift;
- vec->x = (FT_Pos)( (FT_ULong)x << shift );
- vec->y = (FT_Pos)( (FT_ULong)y << shift );
- }
- else
- {
- shift -= FT_TRIG_SAFE_MSB;
- vec->x = x >> shift;
- vec->y = y >> shift;
- shift = -shift;
- }
-
- return shift;
- }
-
-
- static void
- ft_trig_pseudo_rotate( FT_Vector* vec,
- FT_Angle theta )
- {
- FT_Int i;
- FT_Fixed x, y, xtemp, b;
- const FT_Fixed *arctanptr;
-
-
- x = vec->x;
- y = vec->y;
-
- /* Rotate inside [-PI/4,PI/4] sector */
- while ( theta < -FT_ANGLE_PI4 )
- {
- xtemp = y;
- y = -x;
- x = xtemp;
- theta += FT_ANGLE_PI2;
- }
-
- while ( theta > FT_ANGLE_PI4 )
- {
- xtemp = -y;
- y = x;
- x = xtemp;
- theta -= FT_ANGLE_PI2;
- }
-
- arctanptr = ft_trig_arctan_table;
-
- /* Pseudorotations, with right shifts */
- for ( i = 1, b = 1; i < FT_TRIG_MAX_ITERS; b <<= 1, i++ )
- {
- if ( theta < 0 )
- {
- xtemp = x + ( ( y + b ) >> i );
- y = y - ( ( x + b ) >> i );
- x = xtemp;
- theta += *arctanptr++;
- }
- else
- {
- xtemp = x - ( ( y + b ) >> i );
- y = y + ( ( x + b ) >> i );
- x = xtemp;
- theta -= *arctanptr++;
- }
- }
-
- vec->x = x;
- vec->y = y;
- }
-
-
- static void
- ft_trig_pseudo_polarize( FT_Vector* vec )
- {
- FT_Angle theta;
- FT_Int i;
- FT_Fixed x, y, xtemp, b;
- const FT_Fixed *arctanptr;
-
-
- x = vec->x;
- y = vec->y;
-
- /* Get the vector into [-PI/4,PI/4] sector */
- if ( y > x )
- {
- if ( y > -x )
- {
- theta = FT_ANGLE_PI2;
- xtemp = y;
- y = -x;
- x = xtemp;
- }
- else
- {
- theta = y > 0 ? FT_ANGLE_PI : -FT_ANGLE_PI;
- x = -x;
- y = -y;
- }
- }
- else
- {
- if ( y < -x )
- {
- theta = -FT_ANGLE_PI2;
- xtemp = -y;
- y = x;
- x = xtemp;
- }
- else
- {
- theta = 0;
- }
- }
-
- arctanptr = ft_trig_arctan_table;
-
- /* Pseudorotations, with right shifts */
- for ( i = 1, b = 1; i < FT_TRIG_MAX_ITERS; b <<= 1, i++ )
- {
- if ( y > 0 )
- {
- xtemp = x + ( ( y + b ) >> i );
- y = y - ( ( x + b ) >> i );
- x = xtemp;
- theta += *arctanptr++;
- }
- else
- {
- xtemp = x - ( ( y + b ) >> i );
- y = y + ( ( x + b ) >> i );
- x = xtemp;
- theta -= *arctanptr++;
- }
- }
-
- /* round theta */
- if ( theta >= 0 )
- theta = FT_PAD_ROUND( theta, 32 );
- else
- theta = -FT_PAD_ROUND( -theta, 32 );
-
- vec->x = x;
- vec->y = theta;
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( FT_Fixed )
- FT_Cos( FT_Angle angle )
- {
- FT_Vector v;
-
-
- v.x = FT_TRIG_SCALE >> 8;
- v.y = 0;
- ft_trig_pseudo_rotate( &v, angle );
-
- return ( v.x + 0x80L ) >> 8;
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( FT_Fixed )
- FT_Sin( FT_Angle angle )
- {
- return FT_Cos( FT_ANGLE_PI2 - angle );
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( FT_Fixed )
- FT_Tan( FT_Angle angle )
- {
- FT_Vector v;
-
-
- v.x = FT_TRIG_SCALE >> 8;
- v.y = 0;
- ft_trig_pseudo_rotate( &v, angle );
-
- return FT_DivFix( v.y, v.x );
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( FT_Angle )
- FT_Atan2( FT_Fixed dx,
- FT_Fixed dy )
- {
- FT_Vector v;
-
-
- if ( dx == 0 && dy == 0 )
- return 0;
-
- v.x = dx;
- v.y = dy;
- ft_trig_prenorm( &v );
- ft_trig_pseudo_polarize( &v );
-
- return v.y;
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( void )
- FT_Vector_Unit( FT_Vector* vec,
- FT_Angle angle )
- {
- vec->x = FT_TRIG_SCALE >> 8;
- vec->y = 0;
- ft_trig_pseudo_rotate( vec, angle );
- vec->x = ( vec->x + 0x80L ) >> 8;
- vec->y = ( vec->y + 0x80L ) >> 8;
- }
-
-
- /* these macros return 0 for positive numbers,
- and -1 for negative ones */
-#define FT_SIGN_LONG( x ) ( (x) >> ( FT_SIZEOF_LONG * 8 - 1 ) )
-#define FT_SIGN_INT( x ) ( (x) >> ( FT_SIZEOF_INT * 8 - 1 ) )
-#define FT_SIGN_INT32( x ) ( (x) >> 31 )
-#define FT_SIGN_INT16( x ) ( (x) >> 15 )
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( void )
- FT_Vector_Rotate( FT_Vector* vec,
- FT_Angle angle )
- {
- FT_Int shift;
- FT_Vector v;
-
-
- v.x = vec->x;
- v.y = vec->y;
-
- if ( angle && ( v.x != 0 || v.y != 0 ) )
- {
- shift = ft_trig_prenorm( &v );
- ft_trig_pseudo_rotate( &v, angle );
- v.x = ft_trig_downscale( v.x );
- v.y = ft_trig_downscale( v.y );
-
- if ( shift > 0 )
- {
- FT_Int32 half = (FT_Int32)1L << ( shift - 1 );
-
-
- vec->x = ( v.x + half + FT_SIGN_LONG( v.x ) ) >> shift;
- vec->y = ( v.y + half + FT_SIGN_LONG( v.y ) ) >> shift;
- }
- else
- {
- shift = -shift;
- vec->x = (FT_Pos)( (FT_ULong)v.x << shift );
- vec->y = (FT_Pos)( (FT_ULong)v.y << shift );
- }
- }
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( FT_Fixed )
- FT_Vector_Length( FT_Vector* vec )
- {
- FT_Int shift;
- FT_Vector v;
-
-
- v = *vec;
-
- /* handle trivial cases */
- if ( v.x == 0 )
- {
- return FT_ABS( v.y );
- }
- else if ( v.y == 0 )
- {
- return FT_ABS( v.x );
- }
-
- /* general case */
- shift = ft_trig_prenorm( &v );
- ft_trig_pseudo_polarize( &v );
-
- v.x = ft_trig_downscale( v.x );
-
- if ( shift > 0 )
- return ( v.x + ( 1 << ( shift - 1 ) ) ) >> shift;
-
- return (FT_Fixed)( (FT_UInt32)v.x << -shift );
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( void )
- FT_Vector_Polarize( FT_Vector* vec,
- FT_Fixed *length,
- FT_Angle *angle )
- {
- FT_Int shift;
- FT_Vector v;
-
-
- v = *vec;
-
- if ( v.x == 0 && v.y == 0 )
- return;
-
- shift = ft_trig_prenorm( &v );
- ft_trig_pseudo_polarize( &v );
-
- v.x = ft_trig_downscale( v.x );
-
- *length = ( shift >= 0 ) ? ( v.x >> shift )
- : (FT_Fixed)( (FT_UInt32)v.x << -shift );
- *angle = v.y;
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( void )
- FT_Vector_From_Polar( FT_Vector* vec,
- FT_Fixed length,
- FT_Angle angle )
- {
- vec->x = length;
- vec->y = 0;
-
- FT_Vector_Rotate( vec, angle );
- }
-
-
- /* documentation is in fttrigon.h */
-
- FT_EXPORT_DEF( FT_Angle )
- FT_Angle_Diff( FT_Angle angle1,
- FT_Angle angle2 )
- {
- FT_Angle delta = angle2 - angle1;
-
-
- delta %= FT_ANGLE_2PI;
- if ( delta < 0 )
- delta += FT_ANGLE_2PI;
-
- if ( delta > FT_ANGLE_PI )
- delta -= FT_ANGLE_2PI;
-
- return delta;
- }
-
-
-/* END */
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