SurfaceFlinger: handle high refresh rate deny list

Add visibility to SurfaceFlinger into the high refresh rate deny list
and let SurfaceFlinger handle it. Previously WM was setting the
preferredDisplayModeId on the denied app's window. The old way prevented
SurfaceFlinger to use the frame rate override feature as it didn't
know that a specific app is causing the refresh rate spec to be limited.

With this change, SurfaceFlinger will limit the display refresh rate based
on the high refresh rate deny list, and if possible, will use the frame
rate override feature to change the display rate to a multiple, allowing
other animations to be smooth while the denied app remains in the low
refresh rate.

Bug: 170502573
Test: SF unit tests
Change-Id: Idc8a5fe6bc12dbd949ad5e09ff50e339ffaeac36
Merged-In: Idc8a5fe6bc12dbd949ad5e09ff50e339ffaeac36

1 files changed, 7 insertions, 3 deletions

diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index 63be3edf94..e5e10a0014 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -16,6 +16,7 @@
 
 #define LOG_TAG "LayerState"
 
+#include <apex/window.h>
 #include <inttypes.h>
 
 #include <binder/Parcel.h>
@@ -620,7 +621,8 @@ status_t InputWindowCommands::read(const Parcel& input) {
     return NO_ERROR;
 }
 
-bool ValidateFrameRate(float frameRate, int8_t compatibility, const char* inFunctionName) {
+bool ValidateFrameRate(float frameRate, int8_t compatibility, const char* inFunctionName,
+                       bool privileged) {
     const char* functionName = inFunctionName != nullptr ? inFunctionName : "call";
     int floatClassification = std::fpclassify(frameRate);
     if (frameRate < 0 || floatClassification == FP_INFINITE || floatClassification == FP_NAN) {
@@ -629,8 +631,10 @@ bool ValidateFrameRate(float frameRate, int8_t compatibility, const char* inFunc
     }
 
     if (compatibility != ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_DEFAULT &&
-        compatibility != ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_FIXED_SOURCE) {
-        ALOGE("%s failed - invalid compatibility value %d", functionName, compatibility);
+        compatibility != ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_FIXED_SOURCE &&
+        (!privileged || compatibility != ANATIVEWINDOW_FRAME_RATE_EXACT)) {
+        ALOGE("%s failed - invalid compatibility value %d privileged: %s", functionName,
+              compatibility, privileged ? "yes" : "no");
         return false;
     }