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Shift is faster than devision

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This commit is contained in:
Alexander 2017-09-10 01:14:53 +03:00
parent a7cf91499a
commit 765c7eb7de
1 changed files with 6 additions and 4 deletions
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10
libImaging/Convert.c
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@ -44,6 +44,8 @@
/* ITU-R Recommendation 601-2 (assuming nonlinear RGB) */
#define L(rgb)\
((INT32) (rgb)[0]*299 + (INT32) (rgb)[1]*587 + (INT32) (rgb)[2]*114)
#define L24(rgb)\
((rgb)[0]*19595 + (rgb)[1]*38470 + (rgb)[2]*7471)
#ifndef round
double round(double x) {
@ -210,7 +212,7 @@ rgb2l(UINT8* out, const UINT8* in, int xsize)
int x;
for (x = 0; x < xsize; x++, in += 4)
/* ITU-R Recommendation 601-2 (assuming nonlinear RGB) */
*out++ = L(in) / 1000;
*out++ = L24(in) >> 16;
}
static void
@ -219,7 +221,7 @@ rgb2la(UINT8* out, const UINT8* in, int xsize)
int x;
for (x = 0; x < xsize; x++, in += 4, out += 4) {
/* ITU-R Recommendation 601-2 (assuming nonlinear RGB) */
out[0] = out[1] = out[2] = L(in) / 1000;
out[0] = out[1] = out[2] = L24(in) >> 16;
out[3] = 255;
}
}
@ -230,7 +232,7 @@ rgb2i(UINT8* out_, const UINT8* in, int xsize)
int x;
INT32* out = (INT32*) out_;
for (x = 0; x < xsize; x++, in += 4)
*out++ = L(in) / 1000;
*out++ = L24(in) >> 16;
}
static void
@ -419,7 +421,7 @@ rgba2la(UINT8* out, const UINT8* in, int xsize)
int x;
for (x = 0; x < xsize; x++, in += 4, out += 4) {
/* ITU-R Recommendation 601-2 (assuming nonlinear RGB) */
out[0] = out[1] = out[2] = L(in) / 1000;
out[0] = out[1] = out[2] = L24(in) >> 16;
out[3] = in[3];
}
}