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/*
* Copyright (C) 2022 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 <log/log.h>
#include <string>
#include <vector>
template <typename GsInterfaceType, const char *entry>
class DisplayColorLoader {
static_assert(entry != nullptr);
public:
DisplayColorLoader(const DisplayColorLoader &) = delete;
DisplayColorLoader& operator=(const DisplayColorLoader &) = delete;
DisplayColorLoader(const std::string &libName) {
libHandle = dlopen(libName.c_str(), RTLD_LAZY);
if (libHandle == nullptr) {
ALOGE("%s: failed to load library %s\n", __func__, libName.c_str());
getDisplayColor = nullptr;
return;
}
const displaycolor::DisplayColorIntfVer *(*getVersion)();
getVersion = reinterpret_cast<decltype(getVersion)>(dlsym(libHandle, "GetInterfaceVersion"));
if (getVersion == nullptr) {
ALOGE("%s: prebuilt lib is not versioned", __func__);
return;
}
auto intfVer = getVersion();
if (intfVer != nullptr &&
displaycolor::kInterfaceVersion.Compatible(*intfVer)) {
getDisplayColor = reinterpret_cast<decltype(getDisplayColor)>(dlsym(libHandle, entry));
if (getDisplayColor == nullptr) {
ALOGE("%s: failed to get %s\n", __func__, entry);
} else if (!(displaycolor::kInterfaceVersion == *intfVer)) {
ALOGW("%s: different hwc/displaycolor patch level %u.%u.%u vs .%u",
__func__,
intfVer->major,
intfVer->minor,
displaycolor::kInterfaceVersion.patch,
intfVer->patch);
}
} else {
if (intfVer != nullptr) {
ALOGE("%s: prebuilt lib version %u.%u.%u expected %u.%u.%u",
__func__,
intfVer->major,
intfVer->minor,
intfVer->patch,
displaycolor::kInterfaceVersion.major,
displaycolor::kInterfaceVersion.minor,
displaycolor::kInterfaceVersion.patch);
} else {
ALOGE("%s: prebult lib getVersion returns null", __func__);
}
}
}
GsInterfaceType *GetDisplayColor(
const std::vector<displaycolor::DisplayInfo> &display_info) {
if (getDisplayColor != nullptr) {
return getDisplayColor(display_info);
}
return nullptr;
}
~DisplayColorLoader() {
if (libHandle != nullptr) {
dlclose(libHandle);
}
}
private:
void *libHandle;
GsInterfaceType *(*getDisplayColor)(const std::vector<displaycolor::DisplayInfo> &);
};
#endif //DISPLAY_COLOR_LOADER_H
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