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color-lcms: detect identity matrix in color mapping

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Check that we never store an identity matrix as an arbitrary matrix.
This can make processing of weston_color_mapping more efficient.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2025-06-17 16:37:53 +03:00
parent 42c47134d4
commit 0b3822f856
1 changed files with 7 additions and 3 deletions
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10
libweston/color-lcms/color-transform.c
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@ -1403,9 +1403,13 @@ static void
weston_color_mapping_set_from_m4f(struct weston_color_mapping *mapping,
struct weston_mat4f mat)
{
mapping->type = WESTON_COLOR_MAPPING_TYPE_MATRIX;
mapping->u.mat.matrix = weston_m3f_from_m4f_xyz(mat);
mapping->u.mat.offset = weston_v3f_from_v4f_xyz(mat.col[3]);
if (matrix_is_identity(mat, MATRIX_PRECISION_BITS)) {
mapping->type = WESTON_COLOR_MAPPING_TYPE_IDENTITY;
} else {
mapping->type = WESTON_COLOR_MAPPING_TYPE_MATRIX;
mapping->u.mat.matrix = weston_m3f_from_m4f_xyz(mat);
mapping->u.mat.offset = weston_v3f_from_v4f_xyz(mat.col[3]);
}
}
static bool