Updated editor material component slots to support dynamic previews rendered with property overrides applied

Fixed scaling issues with labels used for images
Reduced updating previews and material component inspector to only apply after a value is committed
Storing cache of previously rendered material previews

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialSystemComponent.h

@@ -16,6 +16,7 @@
 #include <AzToolsFramework/AssetBrowser/AssetBrowserBus.h>
 #include <AzToolsFramework/Viewport/ActionBus.h>
 #include <Material/MaterialBrowserInteractions.h>
+#include <QPixmap>
 
 namespace AZ
 {
@@ -24,6 +25,7 @@ namespace AZ
         //! System component that manages launching and maintaining connections with the material editor.
         class EditorMaterialSystemComponent final
             : public AZ::Component
+            , public EditorMaterialSystemComponentNotificationBus::Handler
             , public EditorMaterialSystemComponentRequestBus::Handler
             , public AzToolsFramework::AssetBrowser::AssetBrowserInteractionNotificationBus::Handler
             , public AzToolsFramework::EditorMenuNotificationBus::Handler
@@ -50,8 +52,13 @@ namespace AZ
             //! EditorMaterialSystemComponentRequestBus::Handler overrides...
             void OpenMaterialEditor(const AZStd::string& sourcePath) override;
             void OpenMaterialInspector(const AZ::EntityId& entityId, const AZ::Render::MaterialAssignmentId& materialAssignmentId) override;
-            void RenderMaterialPreview(
-                const AZ::EntityId& entityId, const AZ::Render::MaterialAssignmentId& materialAssignmentId) override;
+            void RenderMaterialPreview(const AZ::EntityId& entityId, const AZ::Render::MaterialAssignmentId& materialAssignmentId) override;
+            QPixmap GetRenderedMaterialPreview(
+                const AZ::EntityId& entityId, const AZ::Render::MaterialAssignmentId& materialAssignmentId) const override;
+
+            //! EditorMaterialSystemComponentNotificationBus::Handler overrides...
+            void OnRenderMaterialPreviewComplete(
+                const AZ::EntityId& entityId, const AZ::Render::MaterialAssignmentId& materialAssignmentId, const QPixmap& pixmap)override;
 
             //! AssetBrowserInteractionNotificationBus::Handler overrides...
             AzToolsFramework::AssetBrowser::SourceFileDetails GetSourceFileDetails(const char* fullSourceFileName) override;
@@ -73,6 +80,7 @@ namespace AZ
             QAction* m_openMaterialEditorAction = nullptr;
             AZStd::unique_ptr<MaterialBrowserInteractions> m_materialBrowserInteractions;
             AZStd::unique_ptr<AtomToolsFramework::PreviewRenderer> m_previewRenderer;
+            AZStd::unordered_map<AZ::EntityId, AZStd::unordered_map<AZ::Render::MaterialAssignmentId, QPixmap>> m_materialPreviews;
         };
     } // namespace Render
 } // namespace AZ