Allow to provide a custom ImageManager for cxx platform (#48109)

Summary:
Pull Request resolved: #48109

[Changelog] [Internal] -  Allow to provide a custom ImageManager for cxx platform

This change allows target platforms to pass a platform specific or app specific ImageManager implementation

Reviewed By: javache

Differential Revision: D66788794

fbshipit-source-id: d7e99cae5de0a4c60047763dce368271dd191b9c

Author: christophpurrer

packages/react-native/ReactCommon/react/renderer/components/image/ImageComponentDescriptor.cpp

@@ -8,12 +8,31 @@
 #include "ImageComponentDescriptor.h"
 #include <react/renderer/imagemanager/ImageManager.h>
 
+namespace {
+
+std::shared_ptr<facebook::react::ImageManager> getImageManager(
+    std::shared_ptr<const facebook::react::ContextContainer>&
+        contextContainer) {
+  if (auto imageManager =
+          contextContainer
+              ->find<std::shared_ptr<facebook::react::ImageManager>>(
+                  facebook::react::ImageManagerKey);
+      imageManager.has_value()) {
+    return imageManager.value();
+  }
+  return std::make_shared<facebook::react::ImageManager>(contextContainer);
+}
+
+} // namespace
+
 namespace facebook::react {
 
+extern const char ImageManagerKey[] = "ImageManager";
+
 ImageComponentDescriptor::ImageComponentDescriptor(
     const ComponentDescriptorParameters& parameters)
     : ConcreteComponentDescriptor(parameters),
-      imageManager_(std::make_shared<ImageManager>(contextContainer_)){};
+      imageManager_(getImageManager(contextContainer_)){};
 
 void ImageComponentDescriptor::adopt(ShadowNode& shadowNode) const {
   ConcreteComponentDescriptor::adopt(shadowNode);

packages/react-native/ReactCommon/react/renderer/components/image/ImageComponentDescriptor.h

@@ -14,6 +14,8 @@ namespace facebook::react {
 
 class ImageManager;
 
+extern const char ImageManagerKey[];
+
 /*
  * Descriptor for <Image> component.
  */