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350d814dd2
This also makes `PhysicalAxis::{Horizontal,Vertical}` more useful when we
previous needed `PhysicalAxes::{Horizontal,Vertical}`.
Differential Revision: https://phabricator.services.mozilla.com/D211941
91 lines
3.1 KiB
C++
91 lines
3.1 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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/* struct containing the output from nsIFrame::Reflow */
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#include "mozilla/ReflowOutput.h"
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#include "mozilla/ReflowInput.h"
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#include "mozilla/WritingModes.h"
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namespace mozilla {
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static bool IsValidOverflowRect(const nsRect& aRect) {
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// `IsEmpty` in the context of `nsRect` means "width OR height is zero."
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// However, in the context of overflow, the rect having one axis as zero is
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// NOT considered empty.
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if (MOZ_LIKELY(!aRect.IsEmpty())) {
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return true;
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}
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// Be defensive and consider rects with any negative size as invalid.
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return !aRect.IsEqualEdges(nsRect()) && aRect.Width() >= 0 &&
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aRect.Height() >= 0;
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}
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/* static */
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nsRect OverflowAreas::GetOverflowClipRect(const nsRect& aRectToClip,
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const nsRect& aBounds,
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PhysicalAxes aClipAxes,
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const nsSize& aOverflowMargin) {
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auto inflatedBounds = aBounds;
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inflatedBounds.Inflate(aOverflowMargin);
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auto clip = aRectToClip;
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if (aClipAxes.contains(PhysicalAxis::Vertical)) {
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clip.y = inflatedBounds.y;
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clip.height = inflatedBounds.height;
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}
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if (aClipAxes.contains(PhysicalAxis::Horizontal)) {
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clip.x = inflatedBounds.x;
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clip.width = inflatedBounds.width;
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}
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return clip;
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}
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/* static */
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void OverflowAreas::ApplyOverflowClippingOnRect(nsRect& aOverflowRect,
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const nsRect& aBounds,
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PhysicalAxes aClipAxes,
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const nsSize& aOverflowMargin) {
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aOverflowRect = aOverflowRect.Intersect(
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GetOverflowClipRect(aOverflowRect, aBounds, aClipAxes, aOverflowMargin));
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}
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void OverflowAreas::UnionWith(const OverflowAreas& aOther) {
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if (IsValidOverflowRect(aOther.InkOverflow())) {
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InkOverflow().UnionRect(InkOverflow(), aOther.InkOverflow());
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}
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if (IsValidOverflowRect(aOther.ScrollableOverflow())) {
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ScrollableOverflow().UnionRect(ScrollableOverflow(),
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aOther.ScrollableOverflow());
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}
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}
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void OverflowAreas::UnionAllWith(const nsRect& aRect) {
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if (!IsValidOverflowRect(aRect)) {
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// Same as `UnionWith()` - avoid losing information.
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return;
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}
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InkOverflow().UnionRect(InkOverflow(), aRect);
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ScrollableOverflow().UnionRect(ScrollableOverflow(), aRect);
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}
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void OverflowAreas::SetAllTo(const nsRect& aRect) {
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InkOverflow() = aRect;
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ScrollableOverflow() = aRect;
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}
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ReflowOutput::ReflowOutput(const ReflowInput& aReflowInput)
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: ReflowOutput(aReflowInput.GetWritingMode()) {}
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void ReflowOutput::SetOverflowAreasToDesiredBounds() {
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mOverflowAreas.SetAllTo(nsRect(0, 0, Width(), Height()));
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}
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void ReflowOutput::UnionOverflowAreasWithDesiredBounds() {
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mOverflowAreas.UnionAllWith(nsRect(0, 0, Width(), Height()));
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}
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} // namespace mozilla
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