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Thumbnail Renderer Issue

I found in a case thumbnails of custom types could look differently in the Content Browser from in the Details Panels if I drew a texture not filling the whole canvas.

So I created a simple asset type to test the case. It has a thumbnail renderer to draw a given texture on the canvas with given padding.

In the following picture, you can see when the given texture is drawn with a padding of 10 pixels, the thumbnail in the Content Browser looks fine but it's not true in the Details Panel. alt text If I try to increase the padding, the space surrounding the given texture will expand further like the following picture with 20 pixel padding. alt text Hence, I think it is a bug and hope someone can fix it because I am doing something like that in my plug-in.

If someone wants to reproduce the bug, they can use the following code:

My test asset type:

 UCLASS(BlueprintType, Blueprintable)
 class TESTTHUMBNAIL_API UMyAsset : public UObject
     class UMyAsset* TestAsset;
     /* Specifies the background texture of the thumbnail. */
     UPROPERTY(EditAnywhere, Category = "Thumbnail")
     class UTexture2D* ThumbnailTexture;
     UPROPERTY(EditAnywhere, Category = "Thumbnail", Meta = (ClampMin = 0, UIMin = 0))
     FMargin ThumbnailPadding;

A Thumbnail renderer for the asset type:

 class TESTTHUMBNAILEDITOR_API UMyAssetThumbnailRenderer : public UThumbnailRenderer
     // UThumbnailRenderer interface
     virtual void Draw(UObject* Object, int32 X, int32 Y, uint32 Width, uint32 Height, FRenderTarget*, FCanvas* Canvas) override;
     // End of UThumbnailRenderer interface        

 void UMyAssetThumbnailRenderer::Draw(UObject* Object, int32 X, int32 Y, uint32 Width, uint32 Height, FRenderTarget*, FCanvas* Canvas)
     UMyAsset* Asset = Cast<UMyAsset>(Object);
     if (Asset == nullptr || Asset->ThumbnailTexture == nullptr ) { return; }
         (float)X + Asset->ThumbnailPadding.Left,
         (float)Y + Asset->ThumbnailPadding.Top,
         (float)Width - Asset->ThumbnailPadding.Left - Asset->ThumbnailPadding.Right,
         (float)Height - Asset->ThumbnailPadding.Top - Asset->ThumbnailPadding.Bottom,

Product Version: UE 4.16
margin10.png (147.9 kB)
margin20.png (137.9 kB)
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asked Jul 01 '17 at 03:17 PM in Bug Reports

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