commit 0d55a2104496039770926426f8f9a5eadcc1640c
author Fabien Sanglard <sanglardf@google.com> Thu Mar 16 16:56:46 2017 -0700
committer Fabien Sanglard <sanglardf@google.com> Mon Mar 20 12:24:29 2017 -0700
tree e40c2a2aabcd4dce9be8689893c257394fcdfbe3
parent f8654facce48952022b12890ebe32eb6a315e7e4

Add graphics composer support for HWC > HWC1.1

Test: Ryu, Marlin
Change-Id: I58a7394f427534b942d64c93b1891a756c5f510c

graphics/composer/2.1/default/Android.bp

diff --git a/graphics/composer/2.1/default/Android.bp b/graphics/composer/2.1/default/Android.bp
index d5da943..0367fcd 100644
--- a/graphics/composer/2.1/default/Android.bp
+++ b/graphics/composer/2.1/default/Android.bp
@@ -37,6 +37,7 @@
         "liblog",
         "libsync",
         "libutils",
+        "libhwc2on1adapter"
     ],
 }
 

graphics/composer/2.1/default/Hwc.cpp

diff --git a/graphics/composer/2.1/default/Hwc.cpp b/graphics/composer/2.1/default/Hwc.cpp
index cf82967..e6ff9e0 100644
--- a/graphics/composer/2.1/default/Hwc.cpp
+++ b/graphics/composer/2.1/default/Hwc.cpp
@@ -22,6 +22,8 @@
 
 #include "ComposerClient.h"
 #include "Hwc.h"
+#include "hardware/hwcomposer.h"
+#include "hwc2on1adapter/HWC2On1Adapter.h"
 
 namespace android {
 namespace hardware {
@@ -30,13 +32,36 @@
 namespace V2_1 {
 namespace implementation {
 
+
 HwcHal::HwcHal(const hw_module_t* module)
-    : mDevice(nullptr), mDispatch()
+    : mDevice(nullptr), mDispatch(), mAdapter()
 {
-    int status = hwc2_open(module, &mDevice);
-    if (status) {
-        LOG_ALWAYS_FATAL("failed to open hwcomposer2 device: %s",
-                strerror(-status));
+    // Determine what kind of module is available (HWC2 vs HWC1.X).
+    hw_device_t* device = nullptr;
+    int error = module->methods->open(module, HWC_HARDWARE_COMPOSER, &device);
+    if (error != 0) {
+        ALOGE("Failed to open HWC device (%s), aborting", strerror(-error));
+        abort();
+    }
+    uint32_t majorVersion = (device->version >> 24) & 0xF;
+
+    // If we don't have a HWC2, we need to wrap whatever we have in an adapter.
+    if (majorVersion != 2) {
+        uint32_t minorVersion = device->version & HARDWARE_API_VERSION_2_MAJ_MIN_MASK;
+        minorVersion = (minorVersion >> 16) & 0xF;
+        ALOGI("Found HWC implementation v%d.%d", majorVersion, minorVersion);
+        if (minorVersion < 1) {
+            ALOGE("Cannot adapt to HWC version %d.%d. Minimum supported is 1.1",
+                  majorVersion, minorVersion);
+            abort();
+        }
+        mAdapter = std::make_unique<HWC2On1Adapter>(
+                reinterpret_cast<hwc_composer_device_1*>(device));
+
+        // Place the adapter in front of the device module.
+        mDevice = mAdapter.get();
+    } else {
+        mDevice = reinterpret_cast<hwc2_device_t*>(device);
     }
 
     initCapabilities();

graphics/composer/2.1/default/Hwc.h

diff --git a/graphics/composer/2.1/default/Hwc.h b/graphics/composer/2.1/default/Hwc.h
index ca08cf0..b45389a 100644
--- a/graphics/composer/2.1/default/Hwc.h
+++ b/graphics/composer/2.1/default/Hwc.h
@@ -18,15 +18,23 @@
 #define ANDROID_HARDWARE_GRAPHICS_COMPOSER_V2_1_HWC_H
 
 #include <mutex>
+#include <memory>
 #include <unordered_set>
 #include <vector>
 
 #include <android/hardware/graphics/composer/2.1/IComposer.h>
+#define HWC2_INCLUDE_STRINGIFICATION
+#define HWC2_USE_CPP11
 #include <hardware/hwcomposer2.h>
-
+#undef HWC2_INCLUDE_STRINGIFICATION
+#undef HWC2_USE_CPP11
 #include "ComposerBase.h"
 
 namespace android {
+    class HWC2On1Adapter;
+}
+
+namespace android {
 namespace hardware {
 namespace graphics {
 namespace composer {
@@ -204,6 +212,10 @@
 
     std::mutex mClientMutex;
     wp<ComposerClient> mClient;
+
+    // If the HWC implementation version is < 2.0, use an adapter to interface
+    // between HWC 2.0 <-> HWC 1.X.
+    std::unique_ptr<HWC2On1Adapter> mAdapter;
 };
 
 extern "C" IComposer* HIDL_FETCH_IComposer(const char* name);