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283 lines
11 KiB
C++
283 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#include "FrameMetrics.h"
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#include <ostream>
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#include "gfxUtils.h"
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#include "nsStyleConsts.h"
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#include "mozilla/gfx/Types.h"
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namespace mozilla {
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namespace layers {
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const ScrollableLayerGuid::ViewID ScrollableLayerGuid::NULL_SCROLL_ID = 0;
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std::ostream& operator<<(std::ostream& aStream, const FrameMetrics& aMetrics) {
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aStream << "{ [cb=" << aMetrics.GetCompositionBounds()
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<< "] [sr=" << aMetrics.GetScrollableRect()
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<< "] [s=" << aMetrics.GetVisualScrollOffset();
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if (aMetrics.GetVisualScrollUpdateType() != FrameMetrics::eNone) {
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aStream << "] [vd=" << aMetrics.GetVisualDestination();
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}
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if (aMetrics.IsScrollInfoLayer()) {
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aStream << "] [scrollinfo";
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}
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aStream << "] [dp=" << aMetrics.GetDisplayPort()
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<< "] [rcs=" << aMetrics.GetBoundingCompositionSize()
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<< "] [v=" << aMetrics.GetLayoutViewport()
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<< nsPrintfCString("] [z=(ld=%.3f r=%.3f",
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aMetrics.GetDevPixelsPerCSSPixel().scale,
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aMetrics.GetPresShellResolution())
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.get()
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<< " cr=" << aMetrics.GetCumulativeResolution()
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<< " z=" << aMetrics.GetZoom()
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<< " t=" << aMetrics.GetTransformToAncestorScale() << " )] [u=("
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<< (int)aMetrics.GetVisualScrollUpdateType() << " "
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<< aMetrics.GetScrollGeneration()
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<< ")] scrollId=" << aMetrics.GetScrollId();
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if (aMetrics.IsRootContent()) {
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aStream << " [rcd]";
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}
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aStream << " }";
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return aStream;
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}
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void FrameMetrics::RecalculateLayoutViewportOffset() {
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// For subframes, the visual and layout viewports coincide, so just
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// keep the layout viewport offset in sync with the visual one.
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if (!mIsRootContent) {
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mLayoutViewport.MoveTo(GetVisualScrollOffset());
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return;
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}
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// For the root, the two viewports can diverge, but the layout
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// viewport needs to keep enclosing the visual viewport.
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KeepLayoutViewportEnclosingVisualViewport(GetVisualViewport(),
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mScrollableRect, mLayoutViewport);
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}
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/* static */
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void FrameMetrics::KeepLayoutViewportEnclosingVisualViewport(
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const CSSRect& aVisualViewport, const CSSRect& aScrollableRect,
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CSSRect& aLayoutViewport) {
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// If the visual viewport is contained within the layout viewport, we don't
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// need to make any adjustments, so we can exit early.
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//
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// Additionally, if the composition bounds changes (due to an orientation
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// change, window resize, etc.), it may take a few frames for aLayoutViewport
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// to update and during that time, the visual viewport may be larger than the
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// layout viewport. In such situations, we take an early exit if the visual
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// viewport contains the layout viewport.
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if (aLayoutViewport.Contains(aVisualViewport) ||
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aVisualViewport.Contains(aLayoutViewport)) {
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return;
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}
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// If visual viewport size is greater than the layout viewport, move the
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// layout viewport such that it remains inside the visual viewport. Otherwise,
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// move the layout viewport such that the visual viewport is contained
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// inside the layout viewport.
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if ((aLayoutViewport.Width() < aVisualViewport.Width() &&
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!FuzzyEqualsMultiplicative(aLayoutViewport.Width(),
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aVisualViewport.Width())) ||
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(aLayoutViewport.Height() < aVisualViewport.Height() &&
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!FuzzyEqualsMultiplicative(aLayoutViewport.Height(),
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aVisualViewport.Height()))) {
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if (aLayoutViewport.X() < aVisualViewport.X()) {
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// layout viewport moves right
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aLayoutViewport.MoveToX(aVisualViewport.X());
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} else if (aVisualViewport.XMost() < aLayoutViewport.XMost()) {
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// layout viewport moves left
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aLayoutViewport.MoveByX(aVisualViewport.XMost() -
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aLayoutViewport.XMost());
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}
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if (aLayoutViewport.Y() < aVisualViewport.Y()) {
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// layout viewport moves down
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aLayoutViewport.MoveToY(aVisualViewport.Y());
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} else if (aVisualViewport.YMost() < aLayoutViewport.YMost()) {
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// layout viewport moves up
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aLayoutViewport.MoveByY(aVisualViewport.YMost() -
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aLayoutViewport.YMost());
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}
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} else {
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if (aVisualViewport.X() < aLayoutViewport.X()) {
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aLayoutViewport.MoveToX(aVisualViewport.X());
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} else if (aLayoutViewport.XMost() < aVisualViewport.XMost()) {
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aLayoutViewport.MoveByX(aVisualViewport.XMost() -
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aLayoutViewport.XMost());
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}
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if (aVisualViewport.Y() < aLayoutViewport.Y()) {
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aLayoutViewport.MoveToY(aVisualViewport.Y());
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} else if (aLayoutViewport.YMost() < aVisualViewport.YMost()) {
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aLayoutViewport.MoveByY(aVisualViewport.YMost() -
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aLayoutViewport.YMost());
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}
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}
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// Regardless of any adjustment above, the layout viewport is not allowed
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// to go outside the scrollable rect.
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aLayoutViewport = aLayoutViewport.MoveInsideAndClamp(aScrollableRect);
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}
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/* static */
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CSSRect FrameMetrics::CalculateScrollRange(
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const CSSRect& aScrollableRect, const ParentLayerRect& aCompositionBounds,
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const CSSToParentLayerScale& aZoom) {
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CSSSize scrollPortSize =
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CalculateCompositedSizeInCssPixels(aCompositionBounds, aZoom);
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CSSRect scrollRange = aScrollableRect;
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scrollRange.SetWidth(
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std::max(scrollRange.Width() - scrollPortSize.width, 0.0f));
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scrollRange.SetHeight(
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std::max(scrollRange.Height() - scrollPortSize.height, 0.0f));
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return scrollRange;
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}
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/* static */
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CSSSize FrameMetrics::CalculateCompositedSizeInCssPixels(
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const ParentLayerRect& aCompositionBounds,
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const CSSToParentLayerScale& aZoom) {
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if (aZoom == CSSToParentLayerScale(0)) {
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return CSSSize(); // avoid division by zero
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}
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return aCompositionBounds.Size() / aZoom;
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}
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bool FrameMetrics::ApplyScrollUpdateFrom(const ScrollPositionUpdate& aUpdate) {
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// In applying a main-thread scroll update, try to preserve the relative
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// offset between the visual and layout viewports.
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CSSPoint relativeOffset = GetVisualScrollOffset() - GetLayoutScrollOffset();
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MOZ_ASSERT(IsRootContent() || relativeOffset == CSSPoint());
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// We need to set the two offsets together, otherwise a subsequent
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// RecalculateLayoutViewportOffset() could see divergent layout and
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// visual offsets.
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bool offsetChanged = SetLayoutScrollOffset(aUpdate.GetDestination());
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offsetChanged |=
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ClampAndSetVisualScrollOffset(aUpdate.GetDestination() + relativeOffset);
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return offsetChanged;
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}
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CSSPoint FrameMetrics::ApplyRelativeScrollUpdateFrom(
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const ScrollPositionUpdate& aUpdate) {
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MOZ_ASSERT(aUpdate.GetType() == ScrollUpdateType::Relative);
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CSSPoint origin = GetVisualScrollOffset();
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CSSPoint delta = (aUpdate.GetDestination() - aUpdate.GetSource());
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SetVisualScrollOffset(origin + delta);
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return GetVisualScrollOffset() - origin;
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}
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CSSPoint FrameMetrics::ApplyPureRelativeScrollUpdateFrom(
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const ScrollPositionUpdate& aUpdate) {
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MOZ_ASSERT(aUpdate.GetType() == ScrollUpdateType::PureRelative);
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CSSPoint origin = GetVisualScrollOffset();
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ClampAndSetVisualScrollOffset(origin + aUpdate.GetDelta());
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return GetVisualScrollOffset() - origin;
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}
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void FrameMetrics::UpdatePendingScrollInfo(const ScrollPositionUpdate& aInfo) {
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// We only get this "pending scroll info" for paint-skip transactions,
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// but PureRelative position updates always trigger a full paint, so
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// we should never enter this code with a PureRelative update type. For
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// the other types, the destination field on the ScrollPositionUpdate will
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// tell us the final layout scroll position on the main thread.
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MOZ_ASSERT(aInfo.GetType() != ScrollUpdateType::PureRelative);
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// In applying a main-thread scroll update, try to preserve the relative
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// offset between the visual and layout viewports.
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CSSPoint relativeOffset = GetVisualScrollOffset() - GetLayoutScrollOffset();
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MOZ_ASSERT(IsRootContent() || relativeOffset == CSSPoint());
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SetLayoutScrollOffset(aInfo.GetDestination());
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ClampAndSetVisualScrollOffset(aInfo.GetDestination() + relativeOffset);
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mScrollGeneration = aInfo.GetGeneration();
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}
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std::ostream& operator<<(std::ostream& aStream,
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const OverscrollBehavior& aBehavior) {
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switch (aBehavior) {
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case OverscrollBehavior::Auto: {
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aStream << "auto";
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break;
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}
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case OverscrollBehavior::Contain: {
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aStream << "contain";
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break;
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}
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case OverscrollBehavior::None: {
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aStream << "none";
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break;
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}
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}
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return aStream;
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}
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OverscrollBehaviorInfo::OverscrollBehaviorInfo()
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: mBehaviorX(OverscrollBehavior::Auto),
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mBehaviorY(OverscrollBehavior::Auto) {}
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static OverscrollBehavior ToOverscrollBehavior(
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StyleOverscrollBehavior aBehavior) {
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switch (aBehavior) {
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case StyleOverscrollBehavior::Auto:
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return OverscrollBehavior::Auto;
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case StyleOverscrollBehavior::Contain:
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return OverscrollBehavior::Contain;
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case StyleOverscrollBehavior::None:
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return OverscrollBehavior::None;
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}
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MOZ_ASSERT_UNREACHABLE("Invalid overscroll behavior");
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return OverscrollBehavior::Auto;
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}
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OverscrollBehaviorInfo OverscrollBehaviorInfo::FromStyleConstants(
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StyleOverscrollBehavior aBehaviorX, StyleOverscrollBehavior aBehaviorY) {
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OverscrollBehaviorInfo result;
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result.mBehaviorX = ToOverscrollBehavior(aBehaviorX);
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result.mBehaviorY = ToOverscrollBehavior(aBehaviorY);
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return result;
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}
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bool OverscrollBehaviorInfo::operator==(
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const OverscrollBehaviorInfo& aOther) const {
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return mBehaviorX == aOther.mBehaviorX && mBehaviorY == aOther.mBehaviorY;
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}
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std::ostream& operator<<(std::ostream& aStream,
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const OverscrollBehaviorInfo& aInfo) {
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if (aInfo.mBehaviorX == aInfo.mBehaviorY) {
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aStream << aInfo.mBehaviorX;
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} else {
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aStream << "{ x=" << aInfo.mBehaviorX << ", y=" << aInfo.mBehaviorY << " }";
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}
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return aStream;
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}
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bool OverflowInfo::operator==(const OverflowInfo& aOther) const {
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return mOverflowX == aOther.mOverflowX && mOverflowY == aOther.mOverflowY;
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}
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std::ostream& operator<<(std::ostream& aStream,
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const ScrollMetadata& aMetadata) {
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aStream << "{ [description=" << aMetadata.GetContentDescription()
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<< "] [metrics=" << aMetadata.GetMetrics();
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if (aMetadata.GetScrollParentId() != ScrollableLayerGuid::NULL_SCROLL_ID) {
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aStream << "] [scrollParent=" << aMetadata.GetScrollParentId();
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}
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if (aMetadata.GetHasScrollgrab()) {
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aStream << "] [scrollgrab";
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}
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aStream << "] [overscroll=" << aMetadata.GetOverscrollBehavior() << "] ["
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<< aMetadata.GetScrollUpdates().Length() << " scrollupdates"
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<< "] }";
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return aStream;
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}
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StaticAutoPtr<const ScrollMetadata> ScrollMetadata::sNullMetadata;
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} // namespace layers
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} // namespace mozilla
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