commit a13f2d58e01d980d39d3617032120c5f9b6423bd
author Brian Lindahl <blindahl@google.com> Thu Mar 05 11:54:17 2020 +0100
committer Brian Lindahl <blindahl@google.com> Mon Mar 09 07:50:20 2020 +0000
tree 612cc7ac616b97c4dbb7d0ffc01787de569db840
parent a821321b901c5fdd9d00914ad3dbfbfa07f78695

Allow GPU composition to occur at a lower resolution

Add a vendor-specified system property to allow GPU fallback composition to occur at a lower resolution than the display mode resolution.

Bug: 144574809

Test: Tested with sysprop disabled, and tested backport in Android Q with sysprop enabled. Unable to test on Android R due to device issues.

Change-Id: I02948ce72f49d20416d0e4dd45a4cffe99e28820

services/surfaceflinger/SurfaceFlinger.cpp

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 163a1c7..5a73727 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -217,6 +217,8 @@
 bool SurfaceFlinger::hasSyncFramework;
 bool SurfaceFlinger::useVrFlinger;
 int64_t SurfaceFlinger::maxFrameBufferAcquiredBuffers;
+uint32_t SurfaceFlinger::maxGraphicsWidth;
+uint32_t SurfaceFlinger::maxGraphicsHeight;
 bool SurfaceFlinger::hasWideColorDisplay;
 ui::Rotation SurfaceFlinger::internalDisplayOrientation = ui::ROTATION_0;
 bool SurfaceFlinger::useColorManagement;
@@ -283,6 +285,9 @@
 
     maxFrameBufferAcquiredBuffers = max_frame_buffer_acquired_buffers(2);
 
+    maxGraphicsWidth = std::max(max_graphics_width(0), 0);
+    maxGraphicsHeight = std::max(max_graphics_height(0), 0);
+
     hasWideColorDisplay = has_wide_color_display(false);
 
     useColorManagement = use_color_management(false);
@@ -2593,7 +2598,8 @@
                              state.surface.get());
 
                     LOG_ALWAYS_FATAL_IF(!displayId);
-                    dispSurface = new FramebufferSurface(getHwComposer(), *displayId, bqConsumer);
+                    dispSurface = new FramebufferSurface(getHwComposer(), *displayId, bqConsumer,
+                                                         maxGraphicsWidth, maxGraphicsHeight);
                     producer = bqProducer;
                 }