void SkColorSpace::computeLazyDstFields() const {
fLazyDstFieldsOnce([this] {
// Invert 3x3 gamut, defaulting to sRGB if we can't.
{
skcms_Matrix3x3 fwd, inv;
memcpy(&fwd, fToXYZD50_3x3, 9*sizeof(float));
if (!skcms_Matrix3x3_invert(&fwd, &inv)) {
SkAssertResult(skcms_Matrix3x3_invert(&skcms_sRGB_profile()->toXYZD50, &inv));
}
memcpy(fFromXYZD50_3x3, &inv, 9*sizeof(float));
}
// Invert transfer function, defaulting to sRGB if we can't.
{
skcms_TransferFunction fwd, inv;
this->transferFn(&fwd.g);
if (!skcms_TransferFunction_invert(&fwd, &inv)) {
inv = *skcms_sRGB_Inverse_TransferFunction();
}
memcpy(fInvTransferFn, &inv, 7*sizeof(float));
}
});
}
sk_sp<SkColorSpace> SkColorSpace::Make(const skcms_ICCProfile& profile) {
// TODO: move below ≈sRGB test?
if (!profile.has_toXYZD50 || !profile.has_trc) {
return nullptr;
}
if (skcms_ApproximatelyEqualProfiles(&profile, skcms_sRGB_profile())) {
return SkColorSpace::MakeSRGB();
}
// TODO: can we save this work and skip lazily inverting the matrix later?
skcms_Matrix3x3 inv;
if (!skcms_Matrix3x3_invert(&profile.toXYZD50, &inv)) {
return nullptr;
}
// We can't work with tables or mismatched parametric curves,
// but if they all look close enough to sRGB, that's fine.
// TODO: should we maybe do this unconditionally to snap near-sRGB parametrics to sRGB?
const skcms_Curve* trc = profile.trc;
if (trc[0].table_entries != 0 ||
trc[1].table_entries != 0 ||
trc[2].table_entries != 0 ||
0 != memcmp(&trc[0].parametric, &trc[1].parametric, sizeof(trc[0].parametric)) ||
0 != memcmp(&trc[0].parametric, &trc[2].parametric, sizeof(trc[0].parametric)))
{
if (skcms_TRCs_AreApproximateInverse(&profile, skcms_sRGB_Inverse_TransferFunction())) {
return SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, profile.toXYZD50);
}
return nullptr;
}
return SkColorSpace::MakeRGB(profile.trc[0].parametric, profile.toXYZD50);
}
DEF_TEST(ColorSpace_skcms_sRGB_exact, r) {
skcms_ICCProfile profile;
sk_srgb_singleton()->toProfile(&profile);
REPORTER_ASSERT(r, 0 == memcmp(&profile, skcms_sRGB_profile(), sizeof(skcms_ICCProfile)));
}
DEF_TEST(ColorSpace_skcms_IsSRGB, r) {
sk_sp<SkColorSpace> srgb = SkColorSpace::Make(*skcms_sRGB_profile());
REPORTER_ASSERT(r, srgb->isSRGB());
}
