Factor out CvTextureCacheManager

This is a platform-specific component that is only used with CVPixelBufferPool.

PiperOrigin-RevId: 488781757

mediapipe/gpu/cv_texture_cache_manager.cc

@@ -0,0 +1,55 @@
+// Copyright 2019 The MediaPipe Authors.
+//
+// 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.
+
+#include "mediapipe/gpu/cv_texture_cache_manager.h"
+
+#include "mediapipe/framework/port/logging.h"
+
+namespace mediapipe {
+
+void CvTextureCacheManager::FlushTextureCaches() {
+  absl::MutexLock lock(&mutex_);
+  for (const auto& cache : texture_caches_) {
+#if TARGET_OS_OSX
+    CVOpenGLTextureCacheFlush(*cache, 0);
+#else
+    CVOpenGLESTextureCacheFlush(*cache, 0);
+#endif  // TARGET_OS_OSX
+  }
+}
+
+void CvTextureCacheManager::RegisterTextureCache(CVTextureCacheType cache) {
+  absl::MutexLock lock(&mutex_);
+
+  CHECK(std::find(texture_caches_.begin(), texture_caches_.end(), cache) ==
+        texture_caches_.end())
+      << "Attempting to register a texture cache twice";
+  texture_caches_.emplace_back(cache);
+}
+
+void CvTextureCacheManager::UnregisterTextureCache(CVTextureCacheType cache) {
+  absl::MutexLock lock(&mutex_);
+
+  auto it = std::find(texture_caches_.begin(), texture_caches_.end(), cache);
+  CHECK(it != texture_caches_.end())
+      << "Attempting to unregister an unknown texture cache";
+  texture_caches_.erase(it);
+}
+
+CvTextureCacheManager::~CvTextureCacheManager() {
+  CHECK_EQ(texture_caches_.size(), 0)
+      << "Failed to unregister texture caches before deleting manager";
+}
+
+}  // namespace mediapipe