backends/drm: allow using sdr gamut wideness with SDR as well

There's no reason to disallow it; while it's not necessarily ideal to use a non-zero
wideness for color critical workflows, that's up to the user to decide.

src/backends/drm/drm_output.cpp

@@ -397,12 +397,14 @@ ColorDescription DrmOutput::createColorDescription(const std::shared_ptr<OutputC
     const auto colorSource = props->colorProfileSource.value_or(colorProfileSource());
     const bool hdr = props->highDynamicRange.value_or(m_state.highDynamicRange);
     const bool wcg = props->wideColorGamut.value_or(m_state.wideColorGamut);
+    const double sdrGamutWideness = props->sdrGamutWideness.value_or(m_state.sdrGamutWideness);
     const auto iccProfile = props->iccProfile.value_or(m_state.iccProfile);
     if (colorSource == ColorProfileSource::ICC && !hdr && !wcg && iccProfile) {
         const double minBrightness = iccProfile->minBrightness().value_or(0);
         const double maxBrightness = iccProfile->maxBrightness().value_or(200);
+        const auto sdrColor = Colorimetry::fromName(NamedColorimetry::BT709).interpolateGamutTo(iccProfile->colorimetry(), sdrGamutWideness);
         // TODO properly apply night light here as well, somehow
-        return ColorDescription(iccProfile->colorimetry(), TransferFunction(TransferFunction::gamma22, minBrightness, maxBrightness), maxBrightness, minBrightness, maxBrightness, maxBrightness);
+        return ColorDescription(iccProfile->colorimetry(), TransferFunction(TransferFunction::gamma22, minBrightness, maxBrightness), maxBrightness, minBrightness, maxBrightness, maxBrightness, iccProfile->colorimetry(), sdrColor);
     }
     const bool supportsHdr = (capabilities() & Capability::HighDynamicRange) && (capabilities() & Capability::WideColorGamut);
     const bool effectiveHdr = hdr && supportsHdr;
@@ -411,7 +413,7 @@ ColorDescription DrmOutput::createColorDescription(const std::shared_ptr<OutputC
 
     const Colorimetry containerColorimetry = effectiveWcg ? Colorimetry::fromName(NamedColorimetry::BT2020) : (colorSource == ColorProfileSource::EDID ? nativeColorimetry : Colorimetry::fromName(NamedColorimetry::BT709));
     const Colorimetry masteringColorimetry = (effectiveWcg || colorSource == ColorProfileSource::EDID) ? nativeColorimetry : Colorimetry::fromName(NamedColorimetry::BT709);
-    const Colorimetry sdrColorimetry = effectiveWcg ? Colorimetry::fromName(NamedColorimetry::BT709).interpolateGamutTo(nativeColorimetry, props->sdrGamutWideness.value_or(m_state.sdrGamutWideness)) : Colorimetry::fromName(NamedColorimetry::BT709);
+    const Colorimetry sdrColorimetry = (effectiveWcg || colorSource == ColorProfileSource::EDID) ? Colorimetry::fromName(NamedColorimetry::BT709).interpolateGamutTo(nativeColorimetry, sdrGamutWideness) : Colorimetry::fromName(NamedColorimetry::BT709);
     // TODO the EDID can contain a gamma value, use that when available and colorSource == ColorProfileSource::EDID
     const double maxAverageBrightness = effectiveHdr ? props->maxAverageBrightnessOverride.value_or(m_state.maxAverageBrightnessOverride).value_or(m_connector->edid()->desiredMaxFrameAverageLuminance().value_or(m_state.referenceLuminance)) : 200;
     const double maxPeakBrightness = effectiveHdr ? props->maxPeakBrightnessOverride.value_or(m_state.maxPeakBrightnessOverride).value_or(m_connector->edid()->desiredMaxLuminance().value_or(800)) : 200 * m_state.artificialHdrHeadroom;