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Ladybird/Qt: Calculate the 'physical pixels' for screens

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This fixes a regression introduced by GH-23855 in [1], and re-applies
a previous change I made [2].

[1] https://github.com/SerenityOS/serenity/commit/dfc7534
[2] https://github.com/SerenityOS/serenity/commit/b7bd3fd
This commit is contained in:
Jamie Mansfield 2024-05-29 22:37:39 +01:00 committed by Tim Ledbetter
parent 4eaabdad34
commit b08d43a5d3
Notes: sideshowbarker 2024-07-17 06:45:52 +09:00 
Author: https://github.com/jamierocks
Commit: https://github.com/SerenityOS/serenity/commit/b08d43a5d3
Pull-request: https://github.com/SerenityOS/serenity/pull/24481
Reviewed-by: https://github.com/tcl3 ✅
1 changed files with 4 additions and 1 deletions
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5
Ladybird/Qt/WebContentView.cpp
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@ -543,8 +543,11 @@ void WebContentView::update_screen_rects()
if (!screens.empty()) {
Vector<Web::DevicePixelRect> screen_rects;
for (auto const& screen : screens) {
// NOTE: QScreen::geometry() returns the 'device-independent pixels', we multiply
// by the device pixel ratio to get the 'physical pixels' of the display.
auto geometry = screen->geometry();
screen_rects.append(Web::DevicePixelRect(geometry.x(), geometry.y(), geometry.width(), geometry.height()));
auto device_pixel_ratio = screen->devicePixelRatio();
screen_rects.append(Web::DevicePixelRect(geometry.x(), geometry.y(), geometry.width() * device_pixel_ratio, geometry.height() * device_pixel_ratio));
}
// NOTE: The first item in QGuiApplication::screens is always the primary screen.