sergiotarxz/libvips
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

remove vips_recip()

Browse Source 
it wasn't really necessary, and it was rather slow
This commit is contained in:
John Cupitt 2021-03-05 20:19:05 +00:00
parent a4d89b852a
commit 0623a05f48
2 changed files with 2 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
libvips/conversion/unpremultiply.c
View File

@ -81,7 +81,7 @@ G_DEFINE_TYPE( VipsUnpremultiply, vips_unpremultiply, VIPS_TYPE_CONVERSION );
\
for( x = 0; x < width; x++ ) { \
IN alpha = p[alpha_band]; \
OUT factor = max_alpha * vips_recip( alpha ); \
OUT factor = alpha == 0 ? 0 : max_alpha / alpha; \
\
for( i = 0; i < alpha_band; i++ ) \
q[i] = factor * p[i]; \
@ -102,7 +102,7 @@ G_DEFINE_TYPE( VipsUnpremultiply, vips_unpremultiply, VIPS_TYPE_CONVERSION );
\
for( x = 0; x < width; x++ ) { \
IN alpha = p[3]; \
OUT factor = max_alpha * vips_recip( alpha ); \
OUT factor = alpha == 0 ? 0 : max_alpha / alpha; \
\
q[0] = factor * p[0]; \
q[1] = factor * p[1]; \

14
libvips/include/vips/util.h
View File

@ -84,20 +84,6 @@ extern "C" {
#define VIPS_FMIN( A, B ) VIPS_MIN( A, B )
#endif
/* Calculate 1.0 / x, avoiding division by zero when near zero.
*/
static inline double
vips_recip( double x )
{
static const double epsilon = 1e-10;
int sign = x < 0.0 ? -1.0 : 1.0;
return( sign * x >= epsilon ?
1.0 / x :
sign / epsilon );
}
/* Testing status before the function call saves a lot of time.
*/
#define VIPS_ONCE( ONCE, FUNC, CLIENT ) \