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