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Typos, whitespace.

This commit is contained in:
Werner Lemberg 2013-01-11 08:29:22 +01:00
parent ad9d5c9726
commit 53c0cb59ed
2 changed files with 9 additions and 9 deletions
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14
ChangeLog
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@ -2,9 +2,9 @@
[base] Update the overflow protection bit. [base] Update the overflow protection bit.
The recent optimizations of CORDIC iterations drastically reduce The recent optimizations of CORDIC iterations drastically reduce the
the expansion factor. The vector components with MSB of 29 are now expansion factor. Vector components with MSB of 29 are now safe
safe from overflow. from overflow.
* src/base/fttrigon.c (FT_TRIG_SAFE_MSB): New macro. * src/base/fttrigon.c (FT_TRIG_SAFE_MSB): New macro.
(ft_trig_prenorm): Use it and remove dead code. (ft_trig_prenorm): Use it and remove dead code.
@ -264,7 +264,7 @@
The dot product between freeVector and projVector or cosine of The dot product between freeVector and projVector or cosine of
the angle between these FT_F2Dot14 unit vectors used to be scaled up the angle between these FT_F2Dot14 unit vectors used to be scaled up
by 4 and routinely occupied 32 bits in an FT_Long field F_dot_P. by 4 and routinely occupied 32 bits in an FT_Long field F_dot_P.
This patch scales the value down by 2^14 instead, which simplifies This patch scales the value down by 2^14 instead, which simplifies
its use throughout the bytecode interpreter. its use throughout the bytecode interpreter.
This does not lead to the loss of precision because the lower bits This does not lead to the loss of precision because the lower bits
@ -277,7 +277,7 @@
Besides code simplification, this change can lead to better Besides code simplification, this change can lead to better
performance when FT_MulDiv with the scaled-down F_dot_P is less performance when FT_MulDiv with the scaled-down F_dot_P is less
likely to use the costly 64-bit path. We are not changing the type likely to use the costly 64-bit path. We are not changing the type
of F_dot_P to FT_F2Dot14 at this point. of F_dot_P to FT_F2Dot14 at this point.
* src/truetype/ttinterp.c (Compute_Funcs): Scale F_dot_P down by 14 * src/truetype/ttinterp.c (Compute_Funcs): Scale F_dot_P down by 14
bits and modify its use accordingly. bits and modify its use accordingly.
@ -483,7 +483,7 @@
[truetype] Cheaper way to threshold angles between vectors. [truetype] Cheaper way to threshold angles between vectors.
* src/truetype/ttinterp.c (Ins_ISECT): Thresholding tangent is a lot * src/truetype/ttinterp.c (Ins_ISECT): Thresholding tangent is a lot
cheaper than thresholding sine. cheaper than thresholding sine.
2012-10-20 Werner Lemberg <wl@gnu.org> 2012-10-20 Werner Lemberg <wl@gnu.org>
@ -5520,7 +5520,7 @@
---------------------------------------------------------------------------- ----------------------------------------------------------------------------
Copyright 2010-2012 by Copyright 2010-2013 by
David Turner, Robert Wilhelm, and Werner Lemberg. David Turner, Robert Wilhelm, and Werner Lemberg.
This file is part of the FreeType project, and may only be used, modified, This file is part of the FreeType project, and may only be used, modified,

4
src/base/fttrigon.c
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@ -42,8 +42,8 @@
/* the Cordic shrink factor 0.858785336480436 * 2^32 */ /* the Cordic shrink factor 0.858785336480436 * 2^32 */
#define FT_TRIG_SCALE 0xDBD95B16UL #define FT_TRIG_SCALE 0xDBD95B16UL
/* the highest bit in overflow-safe vectror components, /* the highest bit in overflow-safe vector components, */
MSB of 0.858785336480436 * sqrt(0.5) * 2^30 */ /* MSB of 0.858785336480436 * sqrt(0.5) * 2^30 */
#define FT_TRIG_SAFE_MSB 29 #define FT_TRIG_SAFE_MSB 29
/* this table was generated for FT_PI = 180L << 16, i.e. degrees */ /* this table was generated for FT_PI = 180L << 16, i.e. degrees */