AtlasEngine: Fix inverted cursor alpha #12548
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The previous implementation only inverted the RGB values of the cell, but failed to account for situations where the `color` is transparent, which is the case when `backgroundOpaqueMixin` is 0 (for instance if acrylic backgrounds are enabled). In these situations the alpha component remained 0 which caused the cursor to be invisible. For some inexplicable reason this issue is only visible on a HDR display, even though it should also effect regular ones. God knows why. With this commit the cursor texture is treated as a mask that inverts the color. We use branching here, because I couldn't come up with a more clever solution. ## PR Checklist * [x] Closes #12507 * [x] I work here * [x] Tests added/passed ## Validation Steps Performed * Cursor is visible on a HDR display with acrylic background ✅ * TBD performance benchmark for `[branch]` ❌ (cherry picked from commit 9ab4abf)
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The previous implementation only inverted the RGB values of the cell,
but failed to account for situations where the
coloris transparent,which is the case when
backgroundOpaqueMixinis 0 (for instance ifacrylic backgrounds are enabled). In these situations the alpha
component remained 0 which caused the cursor to be invisible.
For some inexplicable reason this issue is only visible on a HDR display,
even though it should also effect regular ones. God knows why.
With this commit the cursor texture is treated as a mask that inverts the color.
We use branching here, because I couldn't come up with a more clever solution.
PR Checklist
Validation Steps Performed
[branch]❌