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613 lines
20 KiB
C++
613 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_FRAMEMETRICS_H
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#define GFX_FRAMEMETRICS_H
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#include <stdint.h> // for uint32_t, uint64_t
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#include <string> // for std::string
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#include "Units.h" // for CSSRect, CSSPixel, etc
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#include "mozilla/gfx/BasePoint.h" // for BasePoint
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#include "mozilla/gfx/Rect.h" // for RoundedIn
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#include "mozilla/gfx/ScaleFactor.h" // for ScaleFactor
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#include "mozilla/gfx/Logging.h" // for Log
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namespace IPC {
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template <typename T> struct ParamTraits;
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} // namespace IPC
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namespace mozilla {
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// The layer coordinates of the parent layer.
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// This can be arrived at in two ways:
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// - Start with the CSS coordinates of the parent layer (note: NOT the
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// CSS coordinates of the current layer, that will give you the wrong
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// answer), multiply by the device scale and the resolutions of all
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// layers from the root down to and including the parent.
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// - Start with global screen coordinates and unapply all CSS and async
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// transforms from the root down to and including the parent.
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// It's helpful to look at https://wiki.mozilla.org/Platform/GFX/APZ#Coordinate_systems
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// to get a picture of how the various coordinate systems relate to each other.
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struct ParentLayerPixel {};
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typedef gfx::PointTyped<ParentLayerPixel> ParentLayerPoint;
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typedef gfx::RectTyped<ParentLayerPixel> ParentLayerRect;
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typedef gfx::SizeTyped<ParentLayerPixel> ParentLayerSize;
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typedef gfx::IntMarginTyped<ParentLayerPixel> ParentLayerIntMargin;
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typedef gfx::IntPointTyped<ParentLayerPixel> ParentLayerIntPoint;
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typedef gfx::IntRectTyped<ParentLayerPixel> ParentLayerIntRect;
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typedef gfx::IntSizeTyped<ParentLayerPixel> ParentLayerIntSize;
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typedef gfx::ScaleFactor<CSSPixel, ParentLayerPixel> CSSToParentLayerScale;
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typedef gfx::ScaleFactor<LayoutDevicePixel, ParentLayerPixel> LayoutDeviceToParentLayerScale;
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typedef gfx::ScaleFactor<ScreenPixel, ParentLayerPixel> ScreenToParentLayerScale;
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typedef gfx::ScaleFactor<ParentLayerPixel, LayerPixel> ParentLayerToLayerScale;
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typedef gfx::ScaleFactor<ParentLayerPixel, ScreenPixel> ParentLayerToScreenScale;
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namespace layers {
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/**
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* The viewport and displayport metrics for the painted frame at the
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* time of a layer-tree transaction. These metrics are especially
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* useful for shadow layers, because the metrics values are updated
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* atomically with new pixels.
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*
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* Note that the FrameMetrics struct is sometimes stored in shared
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* memory and shared across processes, so it should be a "Plain Old
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* Data (POD)" type with no members that use dynamic memory.
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*/
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struct FrameMetrics {
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friend struct IPC::ParamTraits<mozilla::layers::FrameMetrics>;
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public:
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// We use IDs to identify frames across processes.
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typedef uint64_t ViewID;
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static const ViewID NULL_SCROLL_ID; // This container layer does not scroll.
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static const ViewID START_SCROLL_ID = 2; // This is the ID that scrolling subframes
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// will begin at.
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FrameMetrics()
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: mCompositionBounds(0, 0, 0, 0)
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, mDisplayPort(0, 0, 0, 0)
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, mCriticalDisplayPort(0, 0, 0, 0)
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, mViewport(0, 0, 0, 0)
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, mScrollableRect(0, 0, 0, 0)
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, mResolution(1)
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, mCumulativeResolution(1)
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, mTransformScale(1)
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, mDevPixelsPerCSSPixel(1)
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, mMayHaveTouchListeners(false)
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, mIsRoot(false)
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, mHasScrollgrab(false)
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, mScrollId(NULL_SCROLL_ID)
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, mScrollOffset(0, 0)
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, mZoom(1)
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, mUpdateScrollOffset(false)
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, mScrollGeneration(0)
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, mContentDescription()
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, mRootCompositionSize(0, 0)
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, mDisplayPortMargins(0, 0, 0, 0)
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, mUseDisplayPortMargins(false)
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, mPresShellId(-1)
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{}
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// Default copy ctor and operator= are fine
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bool operator==(const FrameMetrics& aOther) const
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{
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// mContentDescription is not compared on purpose as it's only used
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// for debugging.
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return mCompositionBounds.IsEqualEdges(aOther.mCompositionBounds) &&
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mRootCompositionSize == aOther.mRootCompositionSize &&
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mDisplayPort.IsEqualEdges(aOther.mDisplayPort) &&
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mDisplayPortMargins == aOther.mDisplayPortMargins &&
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mUseDisplayPortMargins == aOther.mUseDisplayPortMargins &&
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mCriticalDisplayPort.IsEqualEdges(aOther.mCriticalDisplayPort) &&
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mViewport.IsEqualEdges(aOther.mViewport) &&
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mScrollableRect.IsEqualEdges(aOther.mScrollableRect) &&
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mResolution == aOther.mResolution &&
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mCumulativeResolution == aOther.mCumulativeResolution &&
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mDevPixelsPerCSSPixel == aOther.mDevPixelsPerCSSPixel &&
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mMayHaveTouchListeners == aOther.mMayHaveTouchListeners &&
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mPresShellId == aOther.mPresShellId &&
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mIsRoot == aOther.mIsRoot &&
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mScrollId == aOther.mScrollId &&
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mScrollOffset == aOther.mScrollOffset &&
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mHasScrollgrab == aOther.mHasScrollgrab &&
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mUpdateScrollOffset == aOther.mUpdateScrollOffset;
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}
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bool operator!=(const FrameMetrics& aOther) const
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{
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return !operator==(aOther);
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}
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bool IsDefault() const
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{
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FrameMetrics def;
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def.mPresShellId = mPresShellId;
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return (def == *this);
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}
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bool IsRootScrollable() const
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{
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return mIsRoot;
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}
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bool IsScrollable() const
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{
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return mScrollId != NULL_SCROLL_ID;
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}
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CSSToLayerScale LayersPixelsPerCSSPixel() const
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{
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return mCumulativeResolution * mDevPixelsPerCSSPixel;
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}
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LayerPoint GetScrollOffsetInLayerPixels() const
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{
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return GetScrollOffset() * LayersPixelsPerCSSPixel();
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}
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LayoutDeviceToParentLayerScale GetParentResolution() const
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{
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return mCumulativeResolution / mResolution;
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}
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// Ensure the scrollableRect is at least as big as the compositionBounds
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// because the scrollableRect can be smaller if the content is not large
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// and the scrollableRect hasn't been updated yet.
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// We move the scrollableRect up because we don't know if we can move it
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// down. i.e. we know that scrollableRect can go back as far as zero.
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// but we don't know how much further ahead it can go.
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CSSRect GetExpandedScrollableRect() const
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{
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CSSRect scrollableRect = mScrollableRect;
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CSSSize compSize = CalculateCompositedSizeInCssPixels();
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if (scrollableRect.width < compSize.width) {
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scrollableRect.x = std::max(0.f,
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scrollableRect.x - (compSize.width - scrollableRect.width));
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scrollableRect.width = compSize.width;
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}
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if (scrollableRect.height < compSize.height) {
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scrollableRect.y = std::max(0.f,
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scrollableRect.y - (compSize.height - scrollableRect.height));
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scrollableRect.height = compSize.height;
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}
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return scrollableRect;
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}
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// Return the scale factor needed to fit the viewport
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// into its composition bounds.
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CSSToScreenScale CalculateIntrinsicScale() const
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{
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return CSSToScreenScale(float(mCompositionBounds.width) / float(mViewport.width));
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}
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// Return the scale factor for converting from CSS pixels (for this layer)
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// to layer pixels of our parent layer. Much as mZoom is used to interface
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// between inputs we get in screen pixels and quantities in CSS pixels,
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// this is used to interface between mCompositionBounds and quantities
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// in CSS pixels.
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CSSToParentLayerScale GetZoomToParent() const
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{
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return mZoom * mTransformScale;
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}
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CSSSize CalculateCompositedSizeInCssPixels() const
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{
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return mCompositionBounds.Size() / GetZoomToParent();
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}
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CSSRect CalculateCompositedRectInCssPixels() const
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{
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return mCompositionBounds / GetZoomToParent();
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}
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CSSSize CalculateBoundedCompositedSizeInCssPixels() const
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{
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CSSSize size = CalculateCompositedSizeInCssPixels();
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size.width = std::min(size.width, mRootCompositionSize.width);
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size.height = std::min(size.height, mRootCompositionSize.height);
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return size;
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}
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void ScrollBy(const CSSPoint& aPoint)
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{
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mScrollOffset += aPoint;
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}
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void ZoomBy(float aFactor)
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{
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mZoom.scale *= aFactor;
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}
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void CopyScrollInfoFrom(const FrameMetrics& aOther)
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{
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mScrollOffset = aOther.mScrollOffset;
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mScrollGeneration = aOther.mScrollGeneration;
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}
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// ---------------------------------------------------------------------------
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// The following metrics are all in widget space/device pixels.
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//
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// This is the area within the widget that we're compositing to. It is relative
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// to the layer tree origin.
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//
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// This is useful because, on mobile, the viewport and composition dimensions
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// are not always the same. In this case, we calculate the displayport using
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// an area bigger than the region we're compositing to. If we used the
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// viewport dimensions to calculate the displayport, we'd run into situations
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// where we're prerendering the wrong regions and the content may be clipped,
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// or too much of it prerendered. If the composition dimensions are the same as the
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// viewport dimensions, there is no need for this and we can just use the viewport
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// instead.
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//
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// This value is valid for nested scrollable layers as well, and is still
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// relative to the layer tree origin. This value is provided by Gecko at
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// layout/paint time.
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ParentLayerIntRect mCompositionBounds;
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// ---------------------------------------------------------------------------
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// The following metrics are all in CSS pixels. They are not in any uniform
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// space, so each is explained separately.
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//
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// The area of a frame's contents that has been painted, relative to the
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// viewport. It is in the same coordinate space as |mViewport|. For example,
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// if it is at 0,0, then it's at the same place at the viewport, which is at
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// the top-left in the layer, and at the same place as the scroll offset of
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// the document.
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//
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// Note that this is structured in such a way that it doesn't depend on the
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// method layout uses to scroll content.
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//
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// May be larger or smaller than |mScrollableRect|.
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//
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// To pre-render a margin of 100 CSS pixels around the window,
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// { x = -100, y = - 100,
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// width = window.innerWidth + 200, height = window.innerHeight + 200 }
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CSSRect mDisplayPort;
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// If non-empty, the area of a frame's contents that is considered critical
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// to paint. Area outside of this area (i.e. area inside mDisplayPort, but
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// outside of mCriticalDisplayPort) is considered low-priority, and may be
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// painted with lower precision, or not painted at all.
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//
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// The same restrictions for mDisplayPort apply here.
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CSSRect mCriticalDisplayPort;
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// The CSS viewport, which is the dimensions we're using to constrain the
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// <html> element of this frame, relative to the top-left of the layer. Note
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// that its offset is structured in such a way that it doesn't depend on the
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// method layout uses to scroll content.
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//
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// This is mainly useful on the root layer, however nested iframes can have
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// their own viewport, which will just be the size of the window of the
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// iframe. For layers that don't correspond to a document, this metric is
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// meaningless and invalid.
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CSSRect mViewport;
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// The scrollable bounds of a frame. This is determined by reflow.
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// Ordinarily the x and y will be 0 and the width and height will be the
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// size of the element being scrolled. However for RTL pages or elements
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// the x value may be negative.
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//
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// This is relative to the document. It is in the same coordinate space as
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// |mScrollOffset|, but a different coordinate space than |mViewport| and
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// |mDisplayPort|. Note also that this coordinate system is understood by
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// window.scrollTo().
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//
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// This is valid on any layer unless it has no content.
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CSSRect mScrollableRect;
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// ---------------------------------------------------------------------------
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// The following metrics are dimensionless.
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//
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// The incremental resolution that the current frame has been painted at
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// relative to the parent frame's resolution. This information is provided
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// by Gecko at layout/paint time.
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ParentLayerToLayerScale mResolution;
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// The cumulative resolution that the current frame has been painted at.
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// This is the product of our mResolution and the mResolutions of our parent frames.
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// This information is provided by Gecko at layout/paint time.
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LayoutDeviceToLayerScale mCumulativeResolution;
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// The conversion factor between local screen pixels (the coordinate
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// system in which APZCs receive input events) and our parent layer's
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// layer pixels (the coordinate system of mCompositionBounds).
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// This consists of the scale of the local CSS transform and the
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// nontransient async transform.
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// TODO: APZ does not currently work well if there is a CSS transform
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// on the layer being scrolled that's not just a scale that's
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// the same in both directions. When we fix this, mTransformScale
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// will probably need to turn into a matrix.
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ScreenToParentLayerScale mTransformScale;
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// The conversion factor between CSS pixels and device pixels for this frame.
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// This can vary based on a variety of things, such as reflowing-zoom. The
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// conversion factor for device pixels to layers pixels is just the
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// resolution.
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CSSToLayoutDeviceScale mDevPixelsPerCSSPixel;
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// Whether or not this frame may have touch listeners.
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bool mMayHaveTouchListeners;
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// Whether or not this is the root scroll frame for the root content document.
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bool mIsRoot;
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// Whether or not this frame is for an element marked 'scrollgrab'.
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bool mHasScrollgrab;
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public:
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void SetScrollOffset(const CSSPoint& aScrollOffset)
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{
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mScrollOffset = aScrollOffset;
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}
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const CSSPoint& GetScrollOffset() const
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{
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return mScrollOffset;
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}
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void SetZoom(const CSSToScreenScale& aZoom)
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{
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mZoom = aZoom;
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}
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CSSToScreenScale GetZoom() const
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{
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return mZoom;
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}
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void SetScrollOffsetUpdated(uint32_t aScrollGeneration)
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{
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mUpdateScrollOffset = true;
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mScrollGeneration = aScrollGeneration;
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}
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bool GetScrollOffsetUpdated() const
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{
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return mUpdateScrollOffset;
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}
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uint32_t GetScrollGeneration() const
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{
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return mScrollGeneration;
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}
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std::string GetContentDescription() const
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{
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return std::string(mContentDescription);
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}
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void SetContentDescription(const std::string& aContentDescription)
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{
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strncpy(mContentDescription, aContentDescription.c_str(), sizeof(mContentDescription));
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// forcibly null-terminate in case aContentDescription is too long
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mContentDescription[sizeof(mContentDescription) - 1] = '\0';
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}
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ViewID GetScrollId() const
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{
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return mScrollId;
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}
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void SetScrollId(ViewID scrollId)
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{
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mScrollId = scrollId;
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}
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void SetRootCompositionSize(const CSSSize& aRootCompositionSize)
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{
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mRootCompositionSize = aRootCompositionSize;
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}
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const CSSSize& GetRootCompositionSize() const
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{
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return mRootCompositionSize;
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}
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void SetDisplayPortMargins(const LayerMargin& aDisplayPortMargins)
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{
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mDisplayPortMargins = aDisplayPortMargins;
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}
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const LayerMargin& GetDisplayPortMargins() const
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{
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return mDisplayPortMargins;
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}
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void SetUseDisplayPortMargins()
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{
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mUseDisplayPortMargins = true;
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}
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bool GetUseDisplayPortMargins() const
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{
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return mUseDisplayPortMargins;
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}
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uint32_t GetPresShellId() const
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{
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return mPresShellId;
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}
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void SetPresShellId(uint32_t aPresShellId)
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{
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mPresShellId = aPresShellId;
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}
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private:
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// New fields from now on should be made private and old fields should
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// be refactored to be private.
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// A unique ID assigned to each scrollable frame.
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ViewID mScrollId;
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// The position of the top-left of the CSS viewport, relative to the document
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// (or the document relative to the viewport, if that helps understand it).
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//
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// Thus it is relative to the document. It is in the same coordinate space as
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// |mScrollableRect|, but a different coordinate space than |mViewport| and
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// |mDisplayPort|.
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//
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// It is required that the rect:
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// { x = mScrollOffset.x, y = mScrollOffset.y,
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// width = mCompositionBounds.x / mResolution.scale,
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// height = mCompositionBounds.y / mResolution.scale }
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// Be within |mScrollableRect|.
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//
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// This is valid for any layer, but is always relative to this frame and
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// not any parents, regardless of parent transforms.
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CSSPoint mScrollOffset;
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// The "user zoom". Content is painted by gecko at mResolution * mDevPixelsPerCSSPixel,
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// but will be drawn to the screen at mZoom. In the steady state, the
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// two will be the same, but during an async zoom action the two may
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// diverge. This information is initialized in Gecko but updated in the APZC.
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CSSToScreenScale mZoom;
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// Whether mScrollOffset was updated by something other than the APZ code, and
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// if the APZC receiving this metrics should update its local copy.
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bool mUpdateScrollOffset;
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// The scroll generation counter used to acknowledge the scroll offset update.
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uint32_t mScrollGeneration;
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// A description of the content element corresponding to this frame.
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// This is empty unless the apz.printtree pref is turned on.
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char mContentDescription[20];
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// The size of the root scrollable's composition bounds, but in local CSS pixels.
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CSSSize mRootCompositionSize;
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// A display port expressed as layer margins that apply to the rect of what
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// is drawn of the scrollable element.
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LayerMargin mDisplayPortMargins;
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// If this is true then we use the display port margins on this metrics,
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// otherwise use the display port rect.
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bool mUseDisplayPortMargins;
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uint32_t mPresShellId;
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};
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/**
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* This class allows us to uniquely identify a scrollable layer. The
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* mLayersId identifies the layer tree (corresponding to a child process
|
|
* and/or tab) that the scrollable layer belongs to. The mPresShellId
|
|
* is a temporal identifier (corresponding to the document loaded that
|
|
* contains the scrollable layer, which may change over time). The
|
|
* mScrollId corresponds to the actual frame that is scrollable.
|
|
*/
|
|
struct ScrollableLayerGuid {
|
|
uint64_t mLayersId;
|
|
uint32_t mPresShellId;
|
|
FrameMetrics::ViewID mScrollId;
|
|
|
|
ScrollableLayerGuid()
|
|
: mLayersId(0)
|
|
, mPresShellId(0)
|
|
, mScrollId(0)
|
|
{
|
|
MOZ_COUNT_CTOR(ScrollableLayerGuid);
|
|
}
|
|
|
|
ScrollableLayerGuid(uint64_t aLayersId, uint32_t aPresShellId,
|
|
FrameMetrics::ViewID aScrollId)
|
|
: mLayersId(aLayersId)
|
|
, mPresShellId(aPresShellId)
|
|
, mScrollId(aScrollId)
|
|
{
|
|
MOZ_COUNT_CTOR(ScrollableLayerGuid);
|
|
}
|
|
|
|
ScrollableLayerGuid(uint64_t aLayersId, const FrameMetrics& aMetrics)
|
|
: mLayersId(aLayersId)
|
|
, mPresShellId(aMetrics.GetPresShellId())
|
|
, mScrollId(aMetrics.GetScrollId())
|
|
{
|
|
MOZ_COUNT_CTOR(ScrollableLayerGuid);
|
|
}
|
|
|
|
~ScrollableLayerGuid()
|
|
{
|
|
MOZ_COUNT_DTOR(ScrollableLayerGuid);
|
|
}
|
|
|
|
bool operator==(const ScrollableLayerGuid& other) const
|
|
{
|
|
return mLayersId == other.mLayersId
|
|
&& mPresShellId == other.mPresShellId
|
|
&& mScrollId == other.mScrollId;
|
|
}
|
|
|
|
bool operator!=(const ScrollableLayerGuid& other) const
|
|
{
|
|
return !(*this == other);
|
|
}
|
|
};
|
|
|
|
template <int LogLevel>
|
|
gfx::Log<LogLevel>& operator<<(gfx::Log<LogLevel>& log, const ScrollableLayerGuid& aGuid) {
|
|
return log << '(' << aGuid.mLayersId << ',' << aGuid.mPresShellId << ',' << aGuid.mScrollId << ')';
|
|
}
|
|
|
|
struct ZoomConstraints {
|
|
bool mAllowZoom;
|
|
bool mAllowDoubleTapZoom;
|
|
CSSToScreenScale mMinZoom;
|
|
CSSToScreenScale mMaxZoom;
|
|
|
|
ZoomConstraints()
|
|
: mAllowZoom(true)
|
|
, mAllowDoubleTapZoom(true)
|
|
{
|
|
MOZ_COUNT_CTOR(ZoomConstraints);
|
|
}
|
|
|
|
ZoomConstraints(bool aAllowZoom,
|
|
bool aAllowDoubleTapZoom,
|
|
const CSSToScreenScale& aMinZoom,
|
|
const CSSToScreenScale& aMaxZoom)
|
|
: mAllowZoom(aAllowZoom)
|
|
, mAllowDoubleTapZoom(aAllowDoubleTapZoom)
|
|
, mMinZoom(aMinZoom)
|
|
, mMaxZoom(aMaxZoom)
|
|
{
|
|
MOZ_COUNT_CTOR(ZoomConstraints);
|
|
}
|
|
|
|
~ZoomConstraints()
|
|
{
|
|
MOZ_COUNT_DTOR(ZoomConstraints);
|
|
}
|
|
|
|
bool operator==(const ZoomConstraints& other) const
|
|
{
|
|
return mAllowZoom == other.mAllowZoom
|
|
&& mAllowDoubleTapZoom == other.mAllowDoubleTapZoom
|
|
&& mMinZoom == other.mMinZoom
|
|
&& mMaxZoom == other.mMaxZoom;
|
|
}
|
|
|
|
bool operator!=(const ZoomConstraints& other) const
|
|
{
|
|
return !(*this == other);
|
|
}
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* GFX_FRAMEMETRICS_H */
|