From 183a6011709493cf23bae6c7518b9fea1b482263 Mon Sep 17 00:00:00 2001
From: Steve Streeting <steve@stevestreeting.com>
Date: Mon, 23 Nov 2020 11:50:40 +0000
Subject: [PATCH] Useful utility to set Brush content from a sprite without
 using a UImage

---
 .../Private/StevesGameSubsystem.cpp           | 25 +++++++++++++++++++
 .../Public/StevesGameSubsystem.h              |  9 +++++++
 2 files changed, 34 insertions(+)

diff --git a/Source/StevesUEHelpers/Private/StevesGameSubsystem.cpp b/Source/StevesUEHelpers/Private/StevesGameSubsystem.cpp
index 0ae5ee8..a57c9b0 100644
--- a/Source/StevesUEHelpers/Private/StevesGameSubsystem.cpp
+++ b/Source/StevesUEHelpers/Private/StevesGameSubsystem.cpp
@@ -191,6 +191,31 @@ UPaperSprite* UStevesGameSubsystem::GetImageSpriteFromTable(const FKey& InKey,
     return nullptr;
 }
 
+void UStevesGameSubsystem::SetBrushFromAtlas(FSlateBrush* Brush, TScriptInterface<ISlateTextureAtlasInterface> AtlasRegion, bool bMatchSize)
+{
+    if(Brush->GetResourceObject() != AtlasRegion.GetObject())
+    {
+        Brush->SetResourceObject(AtlasRegion.GetObject());
+
+        if (bMatchSize)
+        {
+            if (AtlasRegion)
+            {
+                const FSlateAtlasData AtlasData = AtlasRegion->GetSlateAtlasData();
+                Brush->ImageSize = AtlasData.GetSourceDimensions();
+            }
+            else
+            {
+                Brush->ImageSize = FVector2D(0, 0);
+            }
+        }
+    }
+}
+
+
+
+
+
 UStevesGameSubsystem::FInputModeDetector::FInputModeDetector()
 {
     // 4 local players should be plenty usually (will expand if necessary)
diff --git a/Source/StevesUEHelpers/Public/StevesGameSubsystem.h b/Source/StevesUEHelpers/Public/StevesGameSubsystem.h
index adf44e8..a638f36 100644
--- a/Source/StevesUEHelpers/Public/StevesGameSubsystem.h
+++ b/Source/StevesUEHelpers/Public/StevesGameSubsystem.h
@@ -166,4 +166,13 @@ public:
     */
     UPaperSprite* GetInputImageSpriteFromKey(const FKey& Key, const UUiTheme* Theme = nullptr);
 
+    /**
+     * @brief Set the content of a slate brush from an atlas (e.g. sprite)
+     * @param Brush The brush to update
+     * @param AtlasRegion Atlas to use as source e.g. a Sprite
+     * @param bMatchSize Whether to resize the brush to match the atlas entry
+     */
+    void SetBrushFromAtlas(FSlateBrush* Brush, TScriptInterface<ISlateTextureAtlasInterface> AtlasRegion,
+                          bool bMatchSize);
+
 };