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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.
The recent optimizations of CORDIC iterations drastically reduce
the expansion factor. The vector components with MSB of 29 are now
safe from overflow.
The recent optimizations of CORDIC iterations drastically reduce the
expansion factor. Vector components with MSB of 29 are now safe
from overflow.
* src/base/fttrigon.c (FT_TRIG_SAFE_MSB): New macro.
(ft_trig_prenorm): Use it and remove dead code.
@ -264,7 +264,7 @@
The dot product between freeVector and projVector or cosine of
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.
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.
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
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
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
bits and modify its use accordingly.
@ -483,7 +483,7 @@
[truetype] Cheaper way to threshold angles between vectors.
* 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>
@ -5520,7 +5520,7 @@
----------------------------------------------------------------------------
Copyright 2010-2012 by
Copyright 2010-2013 by
David Turner, Robert Wilhelm, and Werner Lemberg.
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 */
#define FT_TRIG_SCALE 0xDBD95B16UL
/* the highest bit in overflow-safe vectror components,
MSB of 0.858785336480436 * sqrt(0.5) * 2^30 */
/* 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 */