AlphaMode can take following values:
- "DISABLE" - opaque texture
- "BLEND" - normal painting on top of the background, obeying alpha channels if present in the image (uses alpha)
- "ALPHAKEY" - one-bit alpha
- "ADD" - additive blend
- "MOD" - modulating blend
- alphaMode attribute of Texture widget has type AlphaMode.
- As of patch 2.2.0, Blizzard uses only BLEND and ADD AlphaModes in their code.
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