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Fix Windows transparency behavior to support fully-opaque regions (#1621)

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This patch removes an unneeded workaround for transparent windows on the
Windows platform. In addition, it simplifies a couple of related API calls:

* Remove the `CreateRectRgn` call, since we want the entire window's region to
  have blur behind it, and `DwnEnableBlurBehindWindow` does that by default.
* Remove the `color_key` for `SetLayeredWindowAttributes`, since it's not used
  (we're not passing `winuser::LWA_COLORKEY` to the flags).
This commit is contained in:
Jim Porter 2020-10-14 03:23:34 -07:00 committed by GitHub
parent 5a78fe33e8
commit 6343059bc0
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 5 additions and 19 deletions
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1
CHANGELOG.md
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@ -1,6 +1,7 @@
# Unreleased
- On Android, calling `WindowEvent::Focused` now works properly instead of always returning false.
- On Windows, fix bug preventing windows with transparency enabled from having fully-opaque regions.
# 0.23.0 (2020-10-02)

23
src/platform_impl/windows/window.rs
View file

@ -23,7 +23,6 @@ use winapi::{
ole2,
oleidl::LPDROPTARGET,
shobjidl_core::{CLSID_TaskbarList, ITaskbarList2},
wingdi::{CreateRectRgn, DeleteObject},
winnt::LPCWSTR,
winuser,
},
@ -708,33 +707,19 @@ unsafe fn init<T: 'static>(
// making the window transparent
if attributes.transparent && !pl_attribs.no_redirection_bitmap {
let region = CreateRectRgn(0, 0, -1, -1); // makes the window transparent
let bb = dwmapi::DWM_BLURBEHIND {
dwFlags: dwmapi::DWM_BB_ENABLE | dwmapi::DWM_BB_BLURREGION,
dwFlags: dwmapi::DWM_BB_ENABLE,
fEnable: 1,
hRgnBlur: region,
hRgnBlur: ptr::null_mut(),
fTransitionOnMaximized: 0,
};
dwmapi::DwmEnableBlurBehindWindow(real_window.0, &bb);
DeleteObject(region as _);
if attributes.decorations {
// HACK: When opaque (opacity 255), there is a trail whenever
// the transparent window is moved. By reducing it to 254,
// the window is rendered properly.
let opacity = 254;
let opacity = 255;
// The color key can be any value except for black (0x0).
let color_key = 0x0030c100;
winuser::SetLayeredWindowAttributes(
real_window.0,
color_key,
opacity,
winuser::LWA_ALPHA,
);
winuser::SetLayeredWindowAttributes(real_window.0, 0, opacity, winuser::LWA_ALPHA);
}
}