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~10% speedup by matching clipped alpha type with IN/OUT

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Improves unpremultiply precision for float/double input
This commit is contained in:
Lovell Fuller 2017-11-24 19:20:29 +00:00
parent f9f717a843
commit 7e23a140c4
2 changed files with 6 additions and 6 deletions
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4
libvips/conversion/premultiply.c
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@ -78,7 +78,7 @@ G_DEFINE_TYPE( VipsPremultiply, vips_premultiply, VIPS_TYPE_CONVERSION );
for( x = 0; x < width; x++ ) { \ for( x = 0; x < width; x++ ) { \
IN alpha = p[bands - 1]; \ IN alpha = p[bands - 1]; \
IN clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \ IN clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \
double nalpha = (double) clip_alpha / max_alpha; \ OUT nalpha = (OUT) clip_alpha / max_alpha; \
\ \
for( i = 0; i < bands - 1; i++ ) \ for( i = 0; i < bands - 1; i++ ) \
q[i] = p[i] * nalpha; \ q[i] = p[i] * nalpha; \
@ -98,7 +98,7 @@ G_DEFINE_TYPE( VipsPremultiply, vips_premultiply, VIPS_TYPE_CONVERSION );
for( x = 0; x < width; x++ ) { \ for( x = 0; x < width; x++ ) { \
IN alpha = p[3]; \ IN alpha = p[3]; \
IN clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \ IN clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \
double nalpha = (double) clip_alpha / max_alpha; \ OUT nalpha = (OUT) clip_alpha / max_alpha; \
\ \
q[0] = p[0] * nalpha; \ q[0] = p[0] * nalpha; \
q[1] = p[1] * nalpha; \ q[1] = p[1] * nalpha; \

8
libvips/conversion/unpremultiply.c
View File

@ -75,8 +75,8 @@ G_DEFINE_TYPE( VipsUnpremultiply, vips_unpremultiply, VIPS_TYPE_CONVERSION );
\ \
for( x = 0; x < width; x++ ) { \ for( x = 0; x < width; x++ ) { \
IN alpha = p[bands - 1]; \ IN alpha = p[bands - 1]; \
int clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \ IN clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \
double nalpha = (double) clip_alpha / max_alpha; \ OUT nalpha = (OUT) clip_alpha / max_alpha; \
\ \
if( clip_alpha == 0 ) \ if( clip_alpha == 0 ) \
for( i = 0; i < bands - 1; i++ ) \ for( i = 0; i < bands - 1; i++ ) \
@ -99,8 +99,8 @@ G_DEFINE_TYPE( VipsUnpremultiply, vips_unpremultiply, VIPS_TYPE_CONVERSION );
\ \
for( x = 0; x < width; x++ ) { \ for( x = 0; x < width; x++ ) { \
IN alpha = p[3]; \ IN alpha = p[3]; \
int clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \ IN clip_alpha = VIPS_CLIP( 0, alpha, max_alpha ); \
double nalpha = (double) clip_alpha / max_alpha; \ OUT nalpha = (OUT) clip_alpha / max_alpha; \
\ \
if( clip_alpha == 0 ) { \ if( clip_alpha == 0 ) { \
q[0] = 0; \ q[0] = 0; \