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main: Fix borderless fullscreen for high dpi scaled displays

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On Windows, a borderless window will be treated the same as exclusive fullscreen
when the window geometry matches the physical dimensions of the screen.
However, with High DPI scaling, when the devicePixelRatioF() is > 1, the borderless
window apparently is not treated as exclusive fullscreen and functions correctly.
One can verify and replicate this behavior by using a high resolution (4K) display,
and switching between 100% and 200% scaling in Windows' display settings.
At 100%, without the addition of 1, it is treated as exclusive fullscreen.
At 200%, with or without the addition of 1, it is treated as borderless windowed.
Therefore, we can use (read: abuse) this difference in behavior to fix this issue for
those with higher resolution displays when the Qt scaling ratio is > 1.
Should this behavior be changed in the future, please revisit this workaround.
This commit is contained in:
Morph 2023-02-12 19:51:41 -05:00
parent 8b74047b1b
commit d6677b50f6
1 changed files with 13 additions and 1 deletions
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14
src/yuzu/main.cpp
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@ -3167,8 +3167,20 @@ void GMainWindow::ShowFullscreen() {
window->hide();
window->setWindowFlags(window->windowFlags() | Qt::FramelessWindowHint);
const auto screen_geometry = GuessCurrentScreen(window)->geometry();
// NB: On Windows, a borderless window will be treated the same as exclusive fullscreen
// when the window geometry matches the physical dimensions of the screen.
// However, with High DPI scaling, when the devicePixelRatioF() is > 1, the borderless
// window apparently is not treated as exclusive fullscreen and functions correctly.
// One can verify and replicate this behavior by using a high resolution (4K) display,
// and switching between 100% and 200% scaling in Windows' display settings.
// At 100%, without the addition of 1, it is treated as exclusive fullscreen.
// At 200%, with or without the addition of 1, it is treated as borderless windowed.
// Therefore, we can use (read: abuse) this difference in behavior to fix this issue for
// those with higher resolution displays when the Qt scaling ratio is > 1.
// Should this behavior be changed in the future, please revisit this workaround.
const bool must_add_one = devicePixelRatioF() == 1.0f;
window->setGeometry(screen_geometry.x(), screen_geometry.y(), screen_geometry.width(),
screen_geometry.height() + 1);
screen_geometry.height() + (must_add_one ? 1 : 0));
window->raise();
window->showNormal();
};