commit e9ef7c430a223bfebe0d5206f72b1b20af0a0d23
author Dominik Laskowski <domlaskowski@google.com> Mon Mar 12 19:34:30 2018 -0700
committer Dominik Laskowski <domlaskowski@google.com> Mon Apr 30 10:44:35 2018 -0700
tree ab849f69e7f22d259c21007bc842618d5803d924
parent 555c303adccae00d428cd6b6187680b36f0ef262

SF: Generate stable display IDs using EDID

The display IDs generated by HWC are opaque handles. In order for SF and
eventually DisplayManagerService to keep track of more than two displays
and recognize previously seen displays, displays should be given stable
and persistent IDs.

If the HWC supports IComposerClient.getDisplayIdentificationData, SF
parses the EDID structure to generate stable display IDs, which will
be used in a follow-up CL to replace HWC_DISPLAY_{PRIMARY,EXTERNAL}.

Bug: 74619554
Test: dumpsys SurfaceFlinger --display-identification
Test: libsurfaceflinger_unittest
Change-Id: I1a710e2efcf1581fabe48ab96a0eb4e7a5163c0c

services/surfaceflinger/DisplayHardware/ComposerHal.h

diff --git a/services/surfaceflinger/DisplayHardware/ComposerHal.h b/services/surfaceflinger/DisplayHardware/ComposerHal.h
index beee539..bd18b09 100644
--- a/services/surfaceflinger/DisplayHardware/ComposerHal.h
+++ b/services/surfaceflinger/DisplayHardware/ComposerHal.h
@@ -25,8 +25,8 @@
 
 #include <android/frameworks/vr/composer/1.0/IVrComposerClient.h>
 #include <android/hardware/graphics/common/1.1/types.h>
-#include <android/hardware/graphics/composer/2.2/IComposer.h>
-#include <android/hardware/graphics/composer/2.2/IComposerClient.h>
+#include <android/hardware/graphics/composer/2.3/IComposer.h>
+#include <android/hardware/graphics/composer/2.3/IComposerClient.h>
 #include <composer-command-buffer/2.2/ComposerCommandBuffer.h>
 #include <gui/HdrMetadata.h>
 #include <math/mat4.h>
@@ -43,6 +43,7 @@
 
 namespace V2_1 = hardware::graphics::composer::V2_1;
 namespace V2_2 = hardware::graphics::composer::V2_2;
+namespace V2_3 = hardware::graphics::composer::V2_3;
 
 using types::V1_0::ColorTransform;
 using types::V1_0::Hdr;
@@ -61,8 +62,9 @@
 
 using V2_2::CommandReaderBase;
 using V2_2::CommandWriterBase;
-using V2_2::IComposer;
-using V2_2::IComposerClient;
+
+using V2_3::IComposer;
+using V2_3::IComposerClient;
 
 using PerFrameMetadata = IComposerClient::PerFrameMetadata;
 using PerFrameMetadataKey = IComposerClient::PerFrameMetadataKey;
@@ -185,6 +187,10 @@
     virtual Error getRenderIntents(Display display, ColorMode colorMode,
             std::vector<RenderIntent>* outRenderIntents) = 0;
     virtual Error getDataspaceSaturationMatrix(Dataspace dataspace, mat4* outMatrix) = 0;
+
+    // Composer HAL 2.3
+    virtual Error getDisplayIdentificationData(Display display, uint8_t* outPort,
+                                               std::vector<uint8_t>* outData) = 0;
 };
 
 namespace impl {
@@ -380,6 +386,10 @@
             std::vector<RenderIntent>* outRenderIntents) override;
     Error getDataspaceSaturationMatrix(Dataspace dataspace, mat4* outMatrix) override;
 
+    // Composer HAL 2.3
+    Error getDisplayIdentificationData(Display display, uint8_t* outPort,
+                                       std::vector<uint8_t>* outData) override;
+
 private:
     class CommandWriter : public CommandWriterBase {
     public:
@@ -405,7 +415,8 @@
     sp<V2_1::IComposer> mComposer;
 
     sp<V2_1::IComposerClient> mClient;
-    sp<IComposerClient> mClient_2_2;
+    sp<V2_2::IComposerClient> mClient_2_2;
+    sp<IComposerClient> mClient_2_3;
 
     // 64KiB minus a small space for metadata such as read/write pointers
     static constexpr size_t kWriterInitialSize =