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* src/sdf/ftsdf.c: Use FT_16D16 instead of FT_Fixed to avoid confusion.

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Anuj Verma 2020-06-30 17:25:51 +05:30 committed by anujverma
parent 811b6a7177
commit 92a5312036
2 changed files with 16 additions and 9 deletions
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5
[GSoC]ChangeLog
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@ -1,3 +1,8 @@
2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (square_root, cube_root, arc_cos):
Use FT_16D16 instead of FT_Fixed to avoid confusion.
2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in> 2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (cube_root, arc_cos): Added a few * src/sdf/ftsdf.c (cube_root, arc_cos): Added a few

20
src/sdf/ftsdf.c
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@ -600,8 +600,8 @@
*/ */
/* Original Algorithm: https://github.com/chmike/fpsqrt */ /* Original Algorithm: https://github.com/chmike/fpsqrt */
static FT_Fixed static FT_16D16
square_root( FT_Fixed val ) square_root( FT_16D16 val )
{ {
FT_ULong t, q, b, r; FT_ULong t, q, b, r;
@ -627,8 +627,8 @@
/* This function uses newton's iteration to find */ /* This function uses newton's iteration to find */
/* cube root of a fixed point integer. */ /* cube root of a fixed point integer. */
static FT_Fixed static FT_16D16
cube_root( FT_Fixed val ) cube_root( FT_16D16 val )
{ {
/* [IMPORTANT]: This function is not good as it may */ /* [IMPORTANT]: This function is not good as it may */
/* not break, so use a lookup table instead. */ /* not break, so use a lookup table instead. */
@ -659,12 +659,14 @@
return val < 0 ? -g : g; return val < 0 ? -g : g;
} }
/* returns cos inverse of a value */ /* The function calculate the perpendicular */
static FT_Fixed /* using 1 - ( base ^ 2 ) and then use arc */
arc_cos( FT_Fixed val ) /* tan to compute the angle. */
static FT_16D16
arc_cos( FT_16D16 val )
{ {
FT_Fixed p, b = val; FT_16D16 p, b = val;
FT_Fixed one = FT_INT_16D16( 1 ); FT_16D16 one = FT_INT_16D16( 1 );
if ( b > one ) b = one; if ( b > one ) b = one;