Barani SandJohn Tur 917148c5ce gpui: Use DWM API for backdrop effects and add Mica/Mica Alt support (#41842)
This PR updates window background rendering to use the **official DWM
backdrop API** (`DwmSetWindowAttribute`) instead of the legacy
`SetWindowCompositionAttribute`.
It also adds **Mica** and **Mica Alt** options to
`WindowBackgroundAppearance` for native Windows 11 effects.

### Motivation

Enables modern, stable, and GPU-accelerated backdrops consistent with
Windows 11’s Fluent Design.
Removes reliance on undocumented APIs while maintaining backward
compatibility with older Windows versions.

### Changes

* Added `MicaBackdrop` and `MicaAltBackdrop` variants.
* Switched to DWM API for applying backdrop effects.
* Verified fallback behavior on Windows 10.

### Release Notes:

- Added `WindowBackgroundAppearance::MicaBackdrop` and
`WindowBackgroundAppearance::MicaAltBackdrop` for Windows 11 Mica and
Mica Alt window backdrops.

### Screenshots

- `WindowBackgroundAppearance::Blurred`
<img width="553" height="354" alt="image"
src="https://github.com/user-attachments/assets/57c9c25d-9412-4141-94b5-00000cc0b1ec"
/>

- `WindowBackgroundAppearance::MicaBackdrop`
<img width="553" height="354" alt="image"
src="https://github.com/user-attachments/assets/019f541c-3335-4c9e-b026-71f5a1786534"
/>

- `WindowBackgroundAppearance::MicaAltBackdrop`
<img width="553" height="354" alt="image"
src="https://github.com/user-attachments/assets/5128d600-c94d-4c89-b81a-8b842fe1337a"
/>

---------

Co-authored-by: John Tur <john-tur@outlook.com>
2025-11-18 18:20:32 -05:00
2025-10-21 09:58:26 +02:00
2025-10-17 18:49:11 +02:00
2025-11-18 15:33:03 +00:00
2025-09-23 16:49:45 +00:00
2025-05-17 12:34:42 +00:00
2025-09-16 21:58:40 +00:00
2025-10-27 13:27:59 -04:00
WIP
2023-12-14 09:25:14 -07:00
2025-03-10 01:06:11 -07:00
2025-11-12 20:27:04 +00:00
2024-09-30 17:46:21 -04:00
2025-11-12 20:27:04 +00:00
2025-02-04 09:02:59 -05:00
2025-02-04 09:02:59 -05:00
2025-10-27 13:27:59 -04:00
2025-11-10 22:05:46 +00:00
2025-10-17 18:58:14 +00:00
2025-03-10 01:06:11 -07:00

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GPUI – Community Edition maintained by Oak Team
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