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/* -*- 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_ExpectedGeckoMetrics_h
#define mozilla_layers_ExpectedGeckoMetrics_h
#include "Units.h"
namespace mozilla {
namespace layers {
struct FrameMetrics;
// A class that stores a subset of the FrameMetrics information
// than an APZC instance expects Gecko to have (either the
// metrics that were most recently sent to Gecko, or the ones
// most recently received from Gecko).
class ExpectedGeckoMetrics {
public:
ExpectedGeckoMetrics() = default;
void UpdateFrom(const FrameMetrics& aMetrics);
void UpdateZoomFrom(const FrameMetrics& aMetrics);
const CSSPoint& GetVisualScrollOffset() const { return mVisualScrollOffset; }
const CSSToParentLayerScale& GetZoom() const { return mZoom; }
const CSSToLayoutDeviceScale& GetDevPixelsPerCSSPixel() const {
return mDevPixelsPerCSSPixel;
}
private:
CSSPoint mVisualScrollOffset;
CSSToParentLayerScale mZoom;
CSSToLayoutDeviceScale mDevPixelsPerCSSPixel;
};
} // namespace layers
} // namespace mozilla
#endif