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one function table_index3D

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Alexander 2018-03-26 17:41:25 +03:00
parent 845f4dbfe1
commit df192fff1e
1 changed files with 6 additions and 14 deletions
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20
src/libImaging/ColorLUT.c
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@ -111,18 +111,12 @@ interpolate4(INT16 out[4], const INT16 a[4], const INT16 b[4], INT16 shift)
}
static inline int
table3D_index3(int index1D, int index2D, int index3D,
table_index3D(int index1D, int index2D, int index3D,
int size1D, int size1D_2D)
{
return (index1D + index2D * size1D + index3D * size1D_2D) * 3;
return index1D + index2D * size1D + index3D * size1D_2D;
}
static inline int
table3D_index4(int index1D, int index2D, int index3D,
int size1D, int size1D_2D)
{
return (index1D + index2D * size1D + index3D * size1D_2D) * 4;
}
/*
Transforms colors of imIn using provided 3D look-up table
@ -145,7 +139,7 @@ ImagingColorLUT3D_linear(Imaging imOut, Imaging imIn, int table_channels,
INT16* table)
{
/* This float to int conversion doesn't have rounding
error compensation (+ 0.5) for two reasons:
error compensation (+0.5) for two reasons:
1. As we don't hit the highest value,
we can use one extra bit for precision.
2. For every pixel, we interpolate 8 elements from the table:
@ -188,11 +182,9 @@ ImagingColorLUT3D_linear(Imaging imOut, Imaging imIn, int table_channels,
INT16 shift1D = (SCALE_MASK & index1D) >> (SCALE_BITS - SHIFT_BITS);
INT16 shift2D = (SCALE_MASK & index2D) >> (SCALE_BITS - SHIFT_BITS);
INT16 shift3D = (SCALE_MASK & index3D) >> (SCALE_BITS - SHIFT_BITS);
int idx = table3D_index3(
index1D >> SCALE_BITS,
index2D >> SCALE_BITS,
index3D >> SCALE_BITS,
size1D, size1D_2D);
int idx = 3 * table_index3D(
index1D >> SCALE_BITS, index2D >> SCALE_BITS,
index3D >> SCALE_BITS, size1D, size1D_2D);
INT16 result[4], left[4], right[4];
INT16 leftleft[4], leftright[4], rightleft[4], rightright[4];