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color-lcms: replace comments in ensure_output_profile_adds_icc()

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I did not understand the old comments. The new comments explain what
happens here.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2024-02-22 16:11:45 +02:00 • committed by Pekka Paalanen
parent 547dc2738a
commit 570b348f45
1 changed files with 6 additions and 4 deletions
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10
libweston/color-lcms/color-profile.c
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@ -198,8 +198,10 @@ ensure_output_profile_extract_icc(struct cmlcms_output_profile_extract *extract,
if (cmsIsMatrixShaper(hProfile)) {
/**
* Optimization for matrix-shaper profile
* May have 1DLUT->3x3->3x3->1DLUT, 1DLUT->3x3->1DLUT
* Matrix-shaper profiles contain TRC and MatrixColumn tags.
* Assumes that AToB or DToB tags do not exist or are
* equivalent to TRC + MatrixColumn.
* We can take the TRC curves straight as EOTF.
*/
for (i = 0 ; i < 3; i++) {
curve = cmsReadTag(hProfile, tags[i]);
@ -215,8 +217,8 @@ ensure_output_profile_extract_icc(struct cmlcms_output_profile_extract *extract,
}
} else {
/**
* Linearization of cLUT profile may have 1DLUT->3DLUT->1DLUT,
* 1DLUT->3DLUT, 3DLUT
* Any other kind of profile goes through approximate
* linearization that produces sampled curves.
*/
if (!build_eotf_from_clut_profile(lcms_ctx, hProfile,
extract->eotf, num_points)) {