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attempt at speeding up float bilinear: one less flop in coefficient computation

This commit is contained in:
Nicolas Robidoux 2011-01-12 20:32:11 +00:00
parent 15dc216d91
commit 220e2a02eb
1 changed files with 9 additions and 10 deletions
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19
libvips/resample/interpolate.c
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@ -9,7 +9,7 @@
* - tiny speedups * - tiny speedups
* 7/1/11 * 7/1/11
* - don't use tables for bilinear on float data for a small speedup * - don't use tables for bilinear on float data for a small speedup
* (thanks Nicolas) * (thanks Nicolas Robidoux)
* 12/1/11 * 12/1/11
* - faster, more accuarate uchar bilinear (thanks Nicolas) * - faster, more accuarate uchar bilinear (thanks Nicolas)
*/ */
@ -362,16 +362,15 @@ G_DEFINE_TYPE( VipsInterpolateBilinear, vips_interpolate_bilinear,
#define BILINEAR_FLOAT( TYPE ) { \ #define BILINEAR_FLOAT( TYPE ) { \
TYPE *tq = (TYPE *) out; \ TYPE *tq = (TYPE *) out; \
\ \
float X = x - ix; \ float Y = y - iy; \
float Y = y - iy; \ float X = x - ix; \
\ \
float Xd = 1.0 - X; \
float Yd = 1.0 - Y; \ float Yd = 1.0 - Y; \
\ \
float c1 = Xd * Yd; \ float c4 = Y * X; \
float c2 = X * Yd; \ float c2 = Yd * X; \
float c3 = Xd * Y; \ float c3 = Y - c4; \
float c4 = X * Y; \ float c1 = Yd - c2; \
\ \
const TYPE *tp1 = (TYPE *) p1; \ const TYPE *tp1 = (TYPE *) p1; \
const TYPE *tp2 = (TYPE *) p2; \ const TYPE *tp2 = (TYPE *) p2; \