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app: improve performance of HSV hue mode 

No need to do full back and forth RGB/HSV conversions.
This commit is contained in:
Ell 2017-03-15 21:49:13 -04:00
parent 661c22c06f
commit ff5eb69254
1 changed files with 30 additions and 10 deletions
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40
app/operations/layer-modes/gimpoperationlayermode.c
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@ -1885,19 +1885,39 @@ blendfun_hsv_hue (const float *dest,
{
if (dest[ALPHA] != 0.0f && src[ALPHA] != 0.0f)
{
GimpRGB dest_rgb = { dest[0], dest[1], dest[2] };
GimpRGB src_rgb = { src[0], src[1], src[2] };
GimpHSV src_hsv, dest_hsv;
gfloat src_min, src_max, src_delta;
gfloat dest_min, dest_max, dest_delta, dest_s;
gint c;
gimp_rgb_to_hsv (&dest_rgb, &dest_hsv);
gimp_rgb_to_hsv (&src_rgb, &src_hsv);
src_min = MIN (src[0], src[1]);
src_min = MIN (src_min, src[2]);
src_max = MAX (src[0], src[1]);
src_max = MAX (src_max, src[2]);
src_delta = src_max - src_min;
dest_hsv.h = src_hsv.h;
gimp_hsv_to_rgb (&dest_hsv, &dest_rgb);
if (src_delta != 0.0f)
{
gfloat ratio;
gfloat offset;
out[RED] = dest_rgb.r;
out[GREEN] = dest_rgb.g;
out[BLUE] = dest_rgb.b;
dest_min = MIN (dest[0], dest[1]);
dest_min = MIN (dest_min, dest[2]);
dest_max = MAX (dest[0], dest[1]);
dest_max = MAX (dest_max, dest[2]);
dest_delta = dest_max - dest_min;
dest_s = dest_max ? dest_delta / dest_max : 0.0f;
ratio = dest_s * dest_max / src_delta;
offset = dest_max - src_max * ratio;
for (c = 0; c < 3; c++)
out[c] = src[c] * ratio + offset;
}
else
{
for (c = 0; c < 3; c++)
out[c] = dest[c];
}
}
out[ALPHA] = src[ALPHA];