Support fp16 in sf

* Make sure we don't dim SDR in renderengine, and instead map HDR to the
  correct relative luminance above 1.0
* Plumb the HDR/SDR ratio into HWC

Bug: 236745178
Test: builds
Change-Id: I325972a01280d287189d38dd6c5bf7f2d4b776bb
diff --git a/services/surfaceflinger/DisplayHardware/HWC2.cpp b/services/surfaceflinger/DisplayHardware/HWC2.cpp
index bc763b2..24a9e22 100644
--- a/services/surfaceflinger/DisplayHardware/HWC2.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWC2.cpp
@@ -446,12 +446,13 @@
 }
 
 Error Display::setClientTarget(uint32_t slot, const sp<GraphicBuffer>& target,
-        const sp<Fence>& acquireFence, Dataspace dataspace)
-{
+                               const sp<Fence>& acquireFence, Dataspace dataspace,
+                               float hdrSdrRatio) {
     // TODO: Properly encode client target surface damage
     int32_t fenceFd = acquireFence->dup();
-    auto intError = mComposer.setClientTarget(mId, slot, target,
-            fenceFd, dataspace, std::vector<Hwc2::IComposerClient::Rect>());
+    auto intError =
+            mComposer.setClientTarget(mId, slot, target, fenceFd, dataspace,
+                                      std::vector<Hwc2::IComposerClient::Rect>(), hdrSdrRatio);
     return static_cast<Error>(intError);
 }