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new bilinear interpolator

This commit is contained in:
John Cupitt 2015-12-16 14:48:00 +00:00
parent 42f5403cfa
commit 7068fbb20b
1 changed files with 58 additions and 19 deletions
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77
libvips/resample/interpolate.c
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@ -14,6 +14,8 @@
* - faster, more accuarate uchar bilinear (thanks Nicolas)
* 2/2/11
* - gtk-doc
* 16/12/15
* - faster bilinear
*/
/*
@ -426,27 +428,65 @@ G_DEFINE_TYPE( VipsInterpolateBilinear, vips_interpolate_bilinear,
* p3 p4
*/
#define BILINEAR_INT_INNER { \
tq[z] = (c1 * tp1[z] + c2 * tp2[z] + \
c3 * tp3[z] + c4 * tp4[z]) >> VIPS_INTERPOLATE_SHIFT; \
z += 1; \
}
/* Fixed-point arithmetic, no tables.
*/
#define BILINEAR_INT( TYPE ) { \
TYPE * restrict tq = (TYPE *) out; \
\
const int X = (x - ix) * VIPS_INTERPOLATE_SCALE; \
const int Y = (iy - y) * VIPS_INTERPOLATE_SCALE; \
\
float Y = y - iy; \
float X = x - ix; \
\
float Yd = 1.0f - Y; \
\
int c4 = VIPS_INTERPOLATE_SCALE * (Y * X); \
int c2 = VIPS_INTERPOLATE_SCALE * (Yd * X); \
int c3 = VIPS_INTERPOLATE_SCALE * (Y - c4); \
int c1 = VIPS_INTERPOLATE_SCALE * (Yd - c2); \
\
const TYPE * restrict tp1 = (TYPE *) p1; \
const TYPE * restrict tp2 = (TYPE *) p2; \
const TYPE * restrict tp3 = (TYPE *) p3; \
const TYPE * restrict tp4 = (TYPE *) p4; \
\
for( z = 0; z < b; z++ ) { \
const int top = tp1[z] + \
((X * (tp2[z] - tp1[z])) >> VIPS_INTERPOLATE_SHIFT); \
const int bot = tp3[z] + \
((X * (tp4[z] - tp3[z])) >> VIPS_INTERPOLATE_SHIFT); \
\
tq[z] = top - ((Y * (bot - top)) >> VIPS_INTERPOLATE_SHIFT); \
} \
z = 0; \
VIPS_UNROLL( b, BILINEAR_INT_INNER ); \
}
*/
/* Fixed-point arithmetic, no tables.
*/
#define BILINEAR_INT( TYPE ) { \
TYPE * restrict tq = (TYPE *) out; \
\
float Y = y - iy; \
float X = x - ix; \
\
float Yd = 1.0f - Y; \
\
int c4 = VIPS_INTERPOLATE_SCALE * (Y * X); \
int c2 = VIPS_INTERPOLATE_SCALE * (Yd * X); \
int c3 = VIPS_INTERPOLATE_SCALE * (Y - c4); \
int c1 = VIPS_INTERPOLATE_SCALE * (Yd - c2); \
\
const TYPE * restrict tp1 = (TYPE *) p1; \
const TYPE * restrict tp2 = (TYPE *) p2; \
const TYPE * restrict tp3 = (TYPE *) p3; \
const TYPE * restrict tp4 = (TYPE *) p4; \
\
for( z = 0; z < b; z++ ) \
tq[z] = (c1 * tp1[z] + c2 * tp2[z] + \
c3 * tp3[z] + c4 * tp4[z]) >> VIPS_INTERPOLATE_SHIFT; \
}
#define BILINEAR_FLOAT_INNER { \
tq[z] = c1 * tp1[z] + c2 * tp2[z] + \
c3 * tp3[z] + c4 * tp4[z]; \
z += 1; \
}
/* Interpolate a pel ... int32 and float types, no tables, float
@ -455,14 +495,14 @@ G_DEFINE_TYPE( VipsInterpolateBilinear, vips_interpolate_bilinear,
#define BILINEAR_FLOAT( TYPE ) { \
TYPE * restrict tq = (TYPE *) out; \
\
float Y = y - iy; \
float X = x - ix; \
float Y = y - iy; \
float X = x - ix; \
\
float Yd = 1.0f - Y; \
\
float c4 = Y * X; \
float c4 = Y * X; \
float c2 = Yd * X; \
float c3 = Y - c4; \
float c3 = Y - c4; \
float c1 = Yd - c2; \
\
const TYPE * restrict tp1 = (TYPE *) p1; \
@ -470,9 +510,8 @@ G_DEFINE_TYPE( VipsInterpolateBilinear, vips_interpolate_bilinear,
const TYPE * restrict tp3 = (TYPE *) p3; \
const TYPE * restrict tp4 = (TYPE *) p4; \
\
for( z = 0; z < b; z++ ) \
tq[z] = c1 * tp1[z] + c2 * tp2[z] + \
c3 * tp3[z] + c4 * tp4[z]; \
z = 0; \
VIPS_UNROLL( b, BILINEAR_FLOAT_INNER ); \
}
/* Expand for band types. with a fixed-point interpolator and a float