Support for decoding `DXT1` with alpha

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
csharp
Domain
computer-graphics

Research direction

No file or test is named. Start by locating the DXT1 decoding entry point and checking how decoded pixel alpha is assigned. Done means pure-black pixels receive alpha 0, other pixels receive alpha 255, and the behavior is covered by an appropriate test.

Written by the indexing model from the issue text.

Description

DXT1 textures can "carry" alpha information using black pixels, which means that any pixel that is pure black has alpha of 0 and any other pixel has alpha 255.

I couldn't seem to find a way to set this behavior in the library.
Here is an example of what it looks like when DXT1 textures aren't decoded with alpha (the textures in the image were decoded by this library and then converted to PNG using ImageSharp):
image

Dominant language
C#
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67
Forks
17
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