libhwc2.1: add roi calculation for display RRS

This patch calculates roi for histogram sampling
accoring to display RRS mode setups

Bug: 233136164

Test: local test with a hist_client code by setting
different display resolution switch

Change-Id: I35aab6b776b1687c8ae1d37ca439a9409205932c

1 files changed, 10 insertions, 0 deletions

diff --git a/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp b/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp
index 61abffd..e9509dc 100644
--- a/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp
+++ b/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp
@@ -1182,6 +1182,16 @@ int32_t ExynosDisplayDrmInterface::setActiveConfig(hwc2_config_t config) {
     return 0;
 }
 
+int32_t ExynosDisplayDrmInterface::getPanelResolution() {
+    for (auto it = mDrmConnector->modes().begin(); it != mDrmConnector->modes().end(); it++) {
+        if (it->h_display() * it->v_display() > mPanelResolutionHsize * mPanelResolutionVsize) {
+            mPanelResolutionHsize = it->h_display();
+            mPanelResolutionVsize = it->v_display();
+        }
+    }
+    return 0;
+}
+
 int32_t ExynosDisplayDrmInterface::createModeBlob(const DrmMode &mode,
         uint32_t &modeBlob)
 {