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Use premultiplied colours in rendering #6456

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Revert "Fix `SRGBColour` not clamping alpha on multiplication"

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Use premultiplied colours in rendering #6456

Revert "Fix `SRGBColour` not clamping alpha on multiplication"
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Task list completed / task-list-completed Started 2024-12-23 15:44:19 ago

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Required Tasks

Task Status
Closes #3429 Incomplete
Closes ppy/osu#19957 Incomplete
Update iOS code after #6470 Incomplete
PremultipliedImage: Exposes an image with alpha multiplication applied. The image may originally be in straight-alpha form converted using FromStraight, or already premultiplied (aka iOS) and wrapped in the structure using FromPremultiplied. Incomplete
PremultipliedColour: Exposes a Color4 with alpha multiplication applied. Works similar to PremultipliedImage. Incomplete
UniformColour: Special version of UniformVector4 for colours specifically, stores colours as premultiplied. Implicitly converts from/to PremultipliedColour. Incomplete
UniformColourInfo: This is introduced specifically for border colour specifications, as it was extremely too long and adding premultiplied API warranted this. Incomplete
FromStraight, which accepts colours that are not multiplied by alpha yet Incomplete
FromPremultiplied, which accepts colours that have been multiplied already Incomplete
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