From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- gfx/layers/apz/src/ScrollThumbUtils.h | 51 +++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 gfx/layers/apz/src/ScrollThumbUtils.h (limited to 'gfx/layers/apz/src/ScrollThumbUtils.h') diff --git a/gfx/layers/apz/src/ScrollThumbUtils.h b/gfx/layers/apz/src/ScrollThumbUtils.h new file mode 100644 index 0000000000..49a45de3a7 --- /dev/null +++ b/gfx/layers/apz/src/ScrollThumbUtils.h @@ -0,0 +1,51 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_layers_ScrollThumbUtils_h +#define mozilla_layers_ScrollThumbUtils_h + +#include "LayersTypes.h" +#include "Units.h" + +namespace mozilla { +namespace layers { + +class AsyncPanZoomController; + +struct FrameMetrics; +struct ScrollbarData; + +namespace apz { +/** + * Compute the updated shadow transform for a scroll thumb layer that + * reflects async scrolling of the associated scroll frame. + * + * @param aCurrentTransform The current shadow transform on the scroll thumb + * layer, as returned by Layer::GetLocalTransform() or similar. + * @param aScrollableContentTransform The current content transform on the + * scrollable content, as returned by Layer::GetTransform(). + * @param aApzc The APZC that scrolls the scroll frame. + * @param aMetrics The metrics associated with the scroll frame, reflecting + * the last paint of the associated content. Note: this metrics should + * NOT reflect async scrolling or zooming, i.e. they should be the layer + * tree's copy of the metrics, or APZC's last-content-paint metrics. + * @param aScrollbarData The scrollbar data for the the scroll thumb layer. + * @param aScrollbarIsDescendant True iff. the scroll thumb layer is a + * descendant of the layer bearing the scroll frame's metrics. + * @return The new shadow transform for the scroll thumb layer, including + * any pre- or post-scales. + */ +LayerToParentLayerMatrix4x4 ComputeTransformForScrollThumb( + const LayerToParentLayerMatrix4x4& aCurrentTransform, + const gfx::Matrix4x4& aScrollableContentTransform, + AsyncPanZoomController* aApzc, const FrameMetrics& aMetrics, + const ScrollbarData& aScrollbarData, bool aScrollbarIsDescendant); + +} // namespace apz +} // namespace layers +} // namespace mozilla + +#endif // mozilla_layers_ScrollThumbUtils_h -- cgit v1.2.3