sergiotarxz/libvips
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optimized test

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This commit is contained in:
JonDeen 2015-06-09 13:22:30 +02:00
parent dd5722e1e9
commit 8b4830b0bc
1 changed files with 28 additions and 25 deletions

53
libvips/colour/sRGB2HSV.c

@ -54,37 +54,40 @@ vips_sRGB2HSV_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
unsigned char *q = (unsigned char *) out;
int i;
float c1,c2,c3,c_max,c_min,delta,x;
unsigned char c_max,c_min,delta;
int wrap_around_hue = 0;
for( i = 0; i < width; i++ ) {
c1=(float)p[0]/(float)255.0;
c2=(float)p[1]/(float)255.0;
c3=(float)p[2]/(float)255.0;
c_max=VIPS_MAX(c1,VIPS_MAX(c2,c3));
c_min=VIPS_MIN(c1,VIPS_MIN(c2,c3));
delta=c_max-c_min;
float normalization = 256.0/(float)6.0;
if (delta == 0.0) {
q[0] = 0;
} else if (c_max == c1) {
x = ((c2 - c3) / delta);
if (c2 < c3) x += 6.0;
q[0] = (int) (x * normalization);
} else if (c_max == c2) {
q[0] = (int) ((((c3 - c1) / delta) + 2) * normalization);
} else if (c_max == c3) {
q[0] = (int) ((((c1 - c2) / delta) + 4) * normalization);
if (p[1] < p[2]) {
c_max=VIPS_MAX(p[2],p[0]);
c_min=VIPS_MIN(p[1],p[0]);
wrap_around_hue = 256;
} else {
c_max=VIPS_MAX(p[1],p[0]);
c_min=VIPS_MIN(p[2],p[0]);
}
if (c_max == 0.0) {
q[1]=0;
q[2] = c_max;
if (c_max == 0) {
q[0] = q[1] = 0;
} else {
q[1]= (int) (256.0*delta/c_max);
delta=c_max-c_min;
if (c_max == c1) {
q[0] = (unsigned char) (((int)(c2 - c3) / delta)+wrap_around_hue);
} else if (c_max == c2) {
q[0] = (unsigned char) (((int)(c3 - c1) / delta) + 85)
} else if (c_max == c3) {
q[0] = (unsigned char) (((int)(c1 - c2) / delta) + 171);
}
q[1]= (unsigned char) (int) (delta/c_max);
}
q[2]=(int) (c_max * 256.0);