libhwc2.1: load displaycolor library at runtime

To remove HWC compile dependency on vendor.

Bug: 158048652
Change-Id: Ifae4b4fa2bb7079e6fbbfb2910b8b722a787c530
Signed-off-by: Long Ling <longling@google.com>

3 files changed, 69 insertions, 5 deletions

diff --git a/libhwc2.1/libmaindisplay/DisplayColorLoader.h b/libhwc2.1/libmaindisplay/DisplayColorLoader.h
new file mode 100644
index 0000000..c4d7bcd
--- /dev/null
+++ b/libhwc2.1/libmaindisplay/DisplayColorLoader.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef DISPLAY_COLOR_LOADER_H
+#define DISPLAY_COLOR_LOADER_H
+
+#include <dlfcn.h>
+#include <gs101/displaycolor/displaycolor_gs101.h>
+#include <log/log.h>
+#include <string>
+
+class DisplayColorLoader {
+    public:
+      DisplayColorLoader(const char *lib_name) {
+          lib_handle = dlopen(lib_name, RTLD_LAZY);
+
+          if (lib_handle != nullptr) {
+              get_display_color_gs101 = (decltype(get_display_color_gs101))
+                                    dlsym(lib_handle, "GetDisplayColorGS101");
+
+              if (get_display_color_gs101 == nullptr) {
+                  ALOGE("%s: failed to get GetDisplayColorGS101\n", __func__);
+              }
+          } else {
+              ALOGE("%s: failed to load library %s\n", __func__, lib_name);
+              get_display_color_gs101 = nullptr;
+          }
+      }
+
+      displaycolor::IDisplayColorGS101* GetDisplayColorGS101() {
+          if (get_display_color_gs101 != nullptr) {
+              return get_display_color_gs101();
+          }
+
+          return nullptr;
+      }
+
+      ~DisplayColorLoader() {
+          if (lib_handle != nullptr) {
+              dlclose(lib_handle);
+          }
+      }
+
+    private:
+      void *lib_handle;
+      displaycolor::IDisplayColorGS101* (*get_display_color_gs101)();
+};
+
+#endif //DISPLAY_COLOR_LOADER_H
diff --git a/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.cpp b/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.cpp
index 82b8694..4423870 100644
--- a/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.cpp
+++ b/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.cpp
@@ -33,13 +33,13 @@ mpp_phycal_type_t getMPPTypeFromDPPChannel(uint32_t channel) {
 }
 
 ExynosPrimaryDisplayModule::ExynosPrimaryDisplayModule(uint32_t __unused type, ExynosDevice *device)
-    :    ExynosPrimaryDisplay(HWC_DISPLAY_PRIMARY, device)
+    :    ExynosPrimaryDisplay(HWC_DISPLAY_PRIMARY, device), mDisplayColorLoader(DISPLAY_COLOR_LIB)
 {
 #ifdef FORCE_GPU_COMPOSITION
     exynosHWCControl.forceGpu = true;
 #endif
 
-    mDisplayColorInterface = IDisplayColorGS101::Create();
+    mDisplayColorInterface = mDisplayColorLoader.GetDisplayColorGS101();
 }
 
 ExynosPrimaryDisplayModule::~ExynosPrimaryDisplayModule () {
diff --git a/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.h b/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.h
index 3feaea7..fe7ccdd 100644
--- a/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.h
+++ b/libhwc2.1/libmaindisplay/ExynosPrimaryDisplayModule.h
@@ -16,10 +16,12 @@
 #ifndef EXYNOS_DISPLAY_MODULE_H
 #define EXYNOS_DISPLAY_MODULE_H
 
+#include <gs101/displaycolor/displaycolor_gs101.h>
+
+#include "DisplayColorLoader.h"
 #include "ExynosDisplay.h"
 #include "ExynosPrimaryDisplay.h"
 #include "ExynosLayer.h"
-#include <displaycolor/displaycolor_gs101.h>
 
 using namespace displaycolor;
 
@@ -129,8 +131,8 @@ class ExynosPrimaryDisplayModule : public ExynosPrimaryDisplay {
 
     private:
         int32_t setLayersColorData();
-        std::unique_ptr<IDisplayColorGS101> mDisplayColorInterface;
+        IDisplayColorGS101 *mDisplayColorInterface;
         DisplaySceneInfo mDisplaySceneInfo;
-
+        DisplayColorLoader mDisplayColorLoader;
 };
 #endif