composer: add time filtering to display histogram

Adds the ability to filter the content sample by timestamp
and or a framecount. This lets API user limit the returned
sample to data most proximate to the time that the user
is interested in it.

Fixes: 120992129
Test: boot
Test: new unit test for ringbuffer logic.
Test: color_sampling_tool
Test: TestAPI app limiting by maxframes
Test: VtsHalGraphicsComposerV2_3Target (32/36 as before)

Change-Id: I8dd9efc9935570f0f1ab015476ffa8883651073e

1 files changed, 6 insertions, 3 deletions

diff --git a/sdm/libs/hwc2/hwc_display_primary.cpp b/sdm/libs/hwc2/hwc_display_primary.cpp
index 830549aa..360b5d87 100644
--- a/sdm/libs/hwc2/hwc_display_primary.cpp
+++ b/sdm/libs/hwc2/hwc_display_primary.cpp
@@ -741,10 +741,13 @@ HWC2::Error HWCDisplayPrimary::SetDisplayedContentSamplingEnabled(int32_t enable
       api_sampling_vote = false;
     }
 
-    if (api_sampling_vote || vndservice_sampling_vote) {
-      histogram.start();
+    auto start = api_sampling_vote || vndservice_sampling_vote;
+    if (start && max_frames == 0) {
+        histogram.start();
+    } else if (start) {
+        histogram.start(max_frames);
     } else {
-      histogram.stop();
+        histogram.stop();
     }
     return HWC2::Error::None;
 }