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libservo: Make zooming and HiDPI scaling work per-WebView (#36419)

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libservo: Make zooming and HiDPI scaling work per-`WebView`

This change moves all zooming and HiDPI scaling to work per-`WebView` in
both libservo and Compositor. This means that you can pinch zoom one
`WebView` and it should now work independently of other `WebView`s.
This is accomplished by making each `WebView` in the WebRender scene
have its own scaling reference frame.

All WebViews are now expected to manage their HiDPI scaling factor and
this can be set independently of other WebViews. Perhaps in the future
this will become a Servo-wide setting.

This allows full removal of the `WindowMethods` trait from Servo.

Testing: There are not yet any tests for the WebView API, but I hope
to add those soon.

Co-authored-by: Shubham Gupta <shubham13297@gmail.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Shubham Gupta <shubham13297@gmail.com>
This commit is contained in:
Martin Robinson 2025-04-14 14:01:49 +02:00 • committed by GitHub
parent f1417c4e75
commit c6dc7c83a8
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17 changed files with 415 additions and 385 deletions
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9
ports/servoshell/desktop/window_trait.rs
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@ -8,7 +8,6 @@
use std::rc::Rc;
use euclid::{Length, Scale};
use servo::compositing::windowing::WindowMethods;
use servo::servo_geometry::DeviceIndependentPixel;
use servo::webrender_api::units::{DeviceIntPoint, DeviceIntSize, DevicePixel};
use servo::{Cursor, RenderingContext, ScreenGeometry, WebView};
@ -18,13 +17,11 @@ use super::app_state::RunningAppState;
// This should vary by zoom level and maybe actual text size (focused or under cursor)
pub const LINE_HEIGHT: f32 = 38.0;
pub trait WindowPortsMethods: WindowMethods {
pub trait WindowPortsMethods {
fn id(&self) -> winit::window::WindowId;
fn screen_geometry(&self) -> ScreenGeometry;
fn device_hidpi_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel>;
fn device_pixel_ratio_override(
&self,
) -> Option<Scale<f32, DeviceIndependentPixel, DevicePixel>>;
fn device_hidpi_scale_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel>;
fn hidpi_scale_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel>;
fn page_height(&self) -> f32;
fn get_fullscreen(&self) -> bool;
fn handle_winit_event(&self, state: Rc<RunningAppState>, event: winit::event::WindowEvent);