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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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/. */
#include "DisplayListClipState.h"
#include "DisplayItemScrollClip.h"
#include "nsDisplayList.h"
namespace mozilla {
const DisplayItemClip*
DisplayListClipState::GetCurrentCombinedClip(nsDisplayListBuilder* aBuilder)
{
if (mCurrentCombinedClip) {
return mCurrentCombinedClip;
}
if (!mClipContentDescendants && !mClipContainingBlockDescendants) {
return nullptr;
}
if (mClipContentDescendants) {
if (mClipContainingBlockDescendants) {
DisplayItemClip intersection = *mClipContentDescendants;
intersection.IntersectWith(*mClipContainingBlockDescendants);
mCurrentCombinedClip = aBuilder->AllocateDisplayItemClip(intersection);
} else {
mCurrentCombinedClip =
aBuilder->AllocateDisplayItemClip(*mClipContentDescendants);
}
} else {
mCurrentCombinedClip =
aBuilder->AllocateDisplayItemClip(*mClipContainingBlockDescendants);
}
return mCurrentCombinedClip;
}
void
DisplayListClipState::SetScrollClipForContainingBlockDescendants(
nsDisplayListBuilder* aBuilder,
const DisplayItemScrollClip* aScrollClip)
{
if (aBuilder->IsPaintingToWindow() &&
mClipContentDescendants &&
aScrollClip != mScrollClipContainingBlockDescendants) {
// Disable paint skipping for all scroll frames on the way to aScrollClip.
for (const DisplayItemScrollClip* sc = mClipContentDescendantsScrollClip;
sc && !DisplayItemScrollClip::IsAncestor(sc, aScrollClip);
sc = sc->mParent) {
if (sc->mScrollableFrame) {
sc->mScrollableFrame->SetScrollsClipOnUnscrolledOutOfFlow();
}
}
mClipContentDescendantsScrollClip = nullptr;
}
mScrollClipContainingBlockDescendants = aScrollClip;
mStackingContextAncestorSC = DisplayItemScrollClip::PickAncestor(mStackingContextAncestorSC, aScrollClip);
}
void
DisplayListClipState::ClipContainingBlockDescendants(const nsRect& aRect,
const nscoord* aRadii,
DisplayItemClip& aClipOnStack)
{
if (aRadii) {
aClipOnStack.SetTo(aRect, aRadii);
} else {
aClipOnStack.SetTo(aRect);
}
if (mClipContainingBlockDescendants) {
aClipOnStack.IntersectWith(*mClipContainingBlockDescendants);
}
mClipContainingBlockDescendants = &aClipOnStack;
mClipContentDescendantsScrollClip = GetCurrentInnermostScrollClip();
mCurrentCombinedClip = nullptr;
}
void
DisplayListClipState::ClipContentDescendants(const nsRect& aRect,
const nscoord* aRadii,
DisplayItemClip& aClipOnStack)
{
if (aRadii) {
aClipOnStack.SetTo(aRect, aRadii);
} else {
aClipOnStack.SetTo(aRect);
}
if (mClipContentDescendants) {
aClipOnStack.IntersectWith(*mClipContentDescendants);
}
mClipContentDescendants = &aClipOnStack;
mCurrentCombinedClip = nullptr;
}
void
DisplayListClipState::ClipContentDescendants(const nsRect& aRect,
const nsRect& aRoundedRect,
const nscoord* aRadii,
DisplayItemClip& aClipOnStack)
{
if (aRadii) {
aClipOnStack.SetTo(aRect, aRoundedRect, aRadii);
} else {
nsRect intersect = aRect.Intersect(aRoundedRect);
aClipOnStack.SetTo(intersect);
}
if (mClipContentDescendants) {
aClipOnStack.IntersectWith(*mClipContentDescendants);
}
mClipContentDescendants = &aClipOnStack;
mCurrentCombinedClip = nullptr;
}
void
DisplayListClipState::ClipContainingBlockDescendantsToContentBox(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
DisplayItemClip& aClipOnStack,
uint32_t aFlags)
{
nscoord radii[8];
bool hasBorderRadius = aFrame->GetContentBoxBorderRadii(radii);
if (!hasBorderRadius && (aFlags & ASSUME_DRAWING_RESTRICTED_TO_CONTENT_RECT)) {
return;
}
nsRect clipRect = aFrame->GetContentRectRelativeToSelf() +
aBuilder->ToReferenceFrame(aFrame);
// If we have a border-radius, we have to clip our content to that
// radius.
ClipContainingBlockDescendants(clipRect, hasBorderRadius ? radii : nullptr,
aClipOnStack);
}
const DisplayItemScrollClip*
DisplayListClipState::GetCurrentInnermostScrollClip()
{
return DisplayItemScrollClip::PickDescendant(
mScrollClipContentDescendants, mScrollClipContainingBlockDescendants);
}
void
DisplayListClipState::TurnClipIntoScrollClipForContentDescendants(
nsDisplayListBuilder* aBuilder, nsIScrollableFrame* aScrollableFrame)
{
const DisplayItemScrollClip* parent = GetCurrentInnermostScrollClip();
mScrollClipContentDescendants =
aBuilder->AllocateDisplayItemScrollClip(parent,
aScrollableFrame,
GetCurrentCombinedClip(aBuilder), true);
Clear();
}
void
DisplayListClipState::TurnClipIntoScrollClipForContainingBlockDescendants(
nsDisplayListBuilder* aBuilder, nsIScrollableFrame* aScrollableFrame)
{
const DisplayItemScrollClip* parent = GetCurrentInnermostScrollClip();
mScrollClipContainingBlockDescendants =
aBuilder->AllocateDisplayItemScrollClip(parent,
aScrollableFrame,
GetCurrentCombinedClip(aBuilder), true);
Clear();
}
const DisplayItemClip*
WithoutRoundedCorners(nsDisplayListBuilder* aBuilder, const DisplayItemClip* aClip)
{
if (!aClip) {
return nullptr;
}
DisplayItemClip rectClip(*aClip);
rectClip.RemoveRoundedCorners();
return aBuilder->AllocateDisplayItemClip(rectClip);
}
DisplayItemScrollClip*
DisplayListClipState::CreateInactiveScrollClip(
nsDisplayListBuilder* aBuilder, nsIScrollableFrame* aScrollableFrame)
{
// We ignore the rounded corners on the current clip because we don't want
// them to be double-applied (as scroll clip and as regular clip).
// Double-applying rectangle clips doesn't make a visual difference so it's
// fine.
const DisplayItemClip* rectClip =
WithoutRoundedCorners(aBuilder, GetCurrentCombinedClip(aBuilder));
const DisplayItemScrollClip* parent = GetCurrentInnermostScrollClip();
DisplayItemScrollClip* scrollClip =
aBuilder->AllocateDisplayItemScrollClip(parent,
aScrollableFrame,
rectClip, false);
return scrollClip;
}
DisplayItemScrollClip*
DisplayListClipState::InsertInactiveScrollClipForContentDescendants(
nsDisplayListBuilder* aBuilder, nsIScrollableFrame* aScrollableFrame)
{
DisplayItemScrollClip* scrollClip =
CreateInactiveScrollClip(aBuilder, aScrollableFrame);
mScrollClipContentDescendants = scrollClip;
return scrollClip;
}
DisplayItemScrollClip*
DisplayListClipState::InsertInactiveScrollClipForContainingBlockDescendants(
nsDisplayListBuilder* aBuilder, nsIScrollableFrame* aScrollableFrame)
{
DisplayItemScrollClip* scrollClip =
CreateInactiveScrollClip(aBuilder, aScrollableFrame);
mScrollClipContainingBlockDescendants = scrollClip;
return scrollClip;
}
DisplayListClipState::AutoSaveRestore::AutoSaveRestore(nsDisplayListBuilder* aBuilder)
: mState(aBuilder->ClipState())
, mSavedState(aBuilder->ClipState())
#ifdef DEBUG
, mClipUsed(false)
, mRestored(false)
#endif
, mClearedForStackingContextContents(false)
{
mState.mStackingContextAncestorSC = mState.GetCurrentInnermostScrollClip();
}
} // namespace mozilla
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