From ce1c5236412141cc4682e2a8521ad1eec787fb96 Mon Sep 17 00:00:00 2001
From: Carmelo Messina <uazo@users.noreply.github.com>
Date: Thu, 4 Sep 2025 11:50:09 +0200
Subject: [PATCH] Android Pixel Perfect Mode: fix scrolling inside some web
 elements (#2301)

---
 build/patches/Android-Pixel-Perfect-Mode.patch | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/build/patches/Android-Pixel-Perfect-Mode.patch b/build/patches/Android-Pixel-Perfect-Mode.patch
index 2a869d26..971013be 100644
--- a/build/patches/Android-Pixel-Perfect-Mode.patch
+++ b/build/patches/Android-Pixel-Perfect-Mode.patch
@@ -1809,7 +1809,7 @@ diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/th
  
    if (ForMainFrame()) {
      if (size_ != new_size) {
-@@ -1966,6 +1981,8 @@ void WebFrameWidgetImpl::ApplyVisualPropertiesSizing(
+@@ -1967,6 +1982,8 @@ void WebFrameWidgetImpl::ApplyVisualPropertiesSizing(
            size_.value(),
            widget_base_->DIPsToCeiledBlinkSpace(
                widget_base_->VisibleViewportSize()),
@@ -1818,7 +1818,7 @@ diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/th
            visual_properties.browser_controls_params);
        return;
      }
-@@ -1999,6 +2016,8 @@ void WebFrameWidgetImpl::ApplyVisualPropertiesSizing(
+@@ -2000,6 +2017,8 @@ void WebFrameWidgetImpl::ApplyVisualPropertiesSizing(
  
        View()->ResizeWithBrowserControls(
            size_.value(), widget_base_->VisibleViewportSize(),
@@ -1827,7 +1827,7 @@ diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/th
            visual_properties.browser_controls_params);
      }
  
-@@ -2377,6 +2396,8 @@ void WebFrameWidgetImpl::SetZoomInternal(double zoom_level,
+@@ -2378,6 +2397,8 @@ void WebFrameWidgetImpl::SetZoomInternal(double zoom_level,
            View()->ZoomFactorForViewportLayout() *
            static_cast<float>(View()->ZoomLevelToZoomFactor(zoom_level)) *
            static_cast<float>(css_zoom_factor);
@@ -1836,7 +1836,7 @@ diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/th
        if (zoom_changed) {
          // Set the layout shift exclusion window for the zoom level change.
          if (LocalFrameView* view = document->View()) {
-@@ -3429,6 +3450,7 @@ void WebFrameWidgetImpl::SetRootLayer(scoped_refptr<cc::Layer> layer) {
+@@ -3430,6 +3451,7 @@ void WebFrameWidgetImpl::SetRootLayer(scoped_refptr<cc::Layer> layer) {
      // be needed in setting the raster scale.
      SetPageScaleStateAndLimits(1.f, false /* is_pinch_gesture_active */,
                                 View()->MinimumPageScaleFactor(),
@@ -1844,7 +1844,7 @@ diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/th
                                 View()->MaximumPageScaleFactor());
    }
  
-@@ -4798,9 +4820,10 @@ void WebFrameWidgetImpl::SetPageScaleStateAndLimits(
+@@ -4799,9 +4821,10 @@ void WebFrameWidgetImpl::SetPageScaleStateAndLimits(
      float page_scale_factor,
      bool is_pinch_gesture_active,
      float minimum,
@@ -1856,7 +1856,7 @@ diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/th
  
    // Only propagate page scale from the main frame.
    if (ForMainFrame()) {
-@@ -4924,7 +4947,10 @@ void WebFrameWidgetImpl::OrientationChanged() {
+@@ -4925,7 +4948,10 @@ void WebFrameWidgetImpl::OrientationChanged() {
  void WebFrameWidgetImpl::DidUpdateSurfaceAndScreen(
      const display::ScreenInfos& previous_original_screen_infos) {
    display::ScreenInfo screen_info = widget_base_->GetScreenInfo();
@@ -1868,7 +1868,7 @@ diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/th
  
    if (ShouldAutoDetermineCompositingToLCDTextSetting()) {
      // This causes compositing state to be modified which dirties the
-@@ -5120,7 +5146,7 @@ void WebFrameWidgetImpl::SetDeviceScaleFactorForTesting(float factor) {
+@@ -5121,7 +5147,7 @@ void WebFrameWidgetImpl::SetDeviceScaleFactorForTesting(float factor) {
  
    if (!device_scale_factor_for_testing_) {
      non_testing_device_scale_factor_ =
@@ -2047,8 +2047,8 @@ diff --git a/third_party/blink/renderer/platform/widget/input/input_handler_prox
      case WebInputEvent::Type::kGestureScrollBegin:
 -      scroll_state_data.position_x = event.PositionInWidget().x();
 -      scroll_state_data.position_y = event.PositionInWidget().y();
-+      scroll_state_data.position_x = event.PositionInWidget().x() / 2.f;
-+      scroll_state_data.position_y = event.PositionInWidget().y() / 2.f;
++      scroll_state_data.position_x = ScalePoint(event.PositionInWidget()).x();
++      scroll_state_data.position_y = ScalePoint(event.PositionInWidget()).y();
        scroll_state_data.delta_x_hint = -event.data.scroll_begin.delta_x_hint;
        scroll_state_data.delta_y_hint = -event.data.scroll_begin.delta_y_hint;
        scroll_state_data.is_beginning = true;