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color-lcms: recognize single bounded curve segment

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I don't have a specific use case in my mind for this, but it is
something we can easily handle.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2025-06-19 13:35:50 +03:00 • committed by Leandro Ribeiro
parent df2c7bb370
commit 0e474b763f
1 changed files with 18 additions and 9 deletions
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27
libweston/color-lcms/color-curve-segments.c
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@ -583,15 +583,24 @@ get_defining_curve_segment(cmsToneCurve *from, bool *clamped_input)
seg1 = cmsGetToneCurveSegment(1, from);
seg2 = cmsGetToneCurveSegment(2, from);
if (seg0 && !seg1) {
/* Case 1: we have a single segment (seg0).
*
* Ensure that the domain is (-inf, inf).
*/
if (!are_segment_breaks_equal(seg0->x0, -INFINITY) ||
!are_segment_breaks_equal(seg0->x1, INFINITY))
return NULL;
*clamped_input = false;
return seg0;
/* Case 1: we have a single segment (seg0). */
/* If the domain is (-inf, inf), the curve is unbounded. */
if (are_segment_breaks_equal(seg0->x0, -INFINITY) &&
are_segment_breaks_equal(seg0->x1, INFINITY)) {
*clamped_input = false;
return seg0;
}
/* If the domain is [0.0, 1.0], the curve is bounded. */
if (are_segment_breaks_equal(seg0->x0, 0.0) &&
are_segment_breaks_equal(seg0->x1, 1.0)) {
*clamped_input = true;
return seg0;
}
/* We don't handle anything else. */
return NULL;
} else if (seg0 && seg1 && seg2) {
/* Case 2: we have three segments. Clamped input.
*