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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DisplayListClipState.h"
#include "nsDisplayList.h"
namespace mozilla {
const DisplayItemClipChain* DisplayListClipState::GetCurrentCombinedClipChain(
nsDisplayListBuilder* aBuilder) {
if (mCurrentCombinedClipChainIsValid) {
return mCurrentCombinedClipChain;
}
if (!mClipChainContentDescendants && !mClipChainContainingBlockDescendants) {
mCurrentCombinedClipChain = nullptr;
mCurrentCombinedClipChainIsValid = true;
return nullptr;
}
mCurrentCombinedClipChain = aBuilder->CreateClipChainIntersection(
mCurrentCombinedClipChain, mClipChainContentDescendants,
mClipChainContainingBlockDescendants);
mCurrentCombinedClipChainIsValid = true;
return mCurrentCombinedClipChain;
}
static void ApplyClip(nsDisplayListBuilder* aBuilder,
const DisplayItemClipChain*& aClipToModify,
const ActiveScrolledRoot* aASR,
DisplayItemClipChain& aClipChainOnStack) {
aClipChainOnStack.mASR = aASR;
if (aClipToModify && aClipToModify->mASR == aASR) {
// Intersect with aClipToModify and replace the clip chain item.
aClipChainOnStack.mClip.IntersectWith(aClipToModify->mClip);
aClipChainOnStack.mParent = aClipToModify->mParent;
aClipToModify = &aClipChainOnStack;
} else if (!aClipToModify ||
ActiveScrolledRoot::IsAncestor(aClipToModify->mASR, aASR)) {
// Add a new clip chain item at the bottom.
aClipChainOnStack.mParent = aClipToModify;
aClipToModify = &aClipChainOnStack;
} else {
// We need to insert / intersect a DisplayItemClipChain in the middle of the
// aClipToModify chain. This is a very rare case.
// Find the common ancestor and have the builder create the
// DisplayItemClipChain intersection. This will create new
// DisplayItemClipChain objects for all descendants of ancestorSC and we
// will not hold on to a pointer to aClipChainOnStack.
const DisplayItemClipChain* ancestorSC = aClipToModify;
while (ancestorSC &&
ActiveScrolledRoot::IsAncestor(aASR, ancestorSC->mASR)) {
ancestorSC = ancestorSC->mParent;
}
ancestorSC = aBuilder->CopyWholeChain(ancestorSC);
aClipChainOnStack.mParent = nullptr;
aClipToModify = aBuilder->CreateClipChainIntersection(
ancestorSC, aClipToModify, &aClipChainOnStack);
}
}
void DisplayListClipState::ClipContainingBlockDescendants(
nsDisplayListBuilder* aBuilder, const nsRect& aRect, const nscoord* aRadii,
DisplayItemClipChain& aClipChainOnStack) {
if (aRadii) {
aClipChainOnStack.mClip.SetTo(aRect, aRadii);
} else {
aClipChainOnStack.mClip.SetTo(aRect);
}
const ActiveScrolledRoot* asr = aBuilder->CurrentActiveScrolledRoot();
ApplyClip(aBuilder, mClipChainContainingBlockDescendants, asr,
aClipChainOnStack);
InvalidateCurrentCombinedClipChain(asr);
}
void DisplayListClipState::ClipContentDescendants(
nsDisplayListBuilder* aBuilder, const nsRect& aRect, const nscoord* aRadii,
DisplayItemClipChain& aClipChainOnStack) {
if (aRadii) {
aClipChainOnStack.mClip.SetTo(aRect, aRadii);
} else {
aClipChainOnStack.mClip.SetTo(aRect);
}
const ActiveScrolledRoot* asr = aBuilder->CurrentActiveScrolledRoot();
ApplyClip(aBuilder, mClipChainContentDescendants, asr, aClipChainOnStack);
InvalidateCurrentCombinedClipChain(asr);
}
void DisplayListClipState::ClipContentDescendants(
nsDisplayListBuilder* aBuilder, const nsRect& aRect,
const nsRect& aRoundedRect, const nscoord* aRadii,
DisplayItemClipChain& aClipChainOnStack) {
if (aRadii) {
aClipChainOnStack.mClip.SetTo(aRect, aRoundedRect, aRadii);
} else {
nsRect intersect = aRect.Intersect(aRoundedRect);
aClipChainOnStack.mClip.SetTo(intersect);
}
const ActiveScrolledRoot* asr = aBuilder->CurrentActiveScrolledRoot();
ApplyClip(aBuilder, mClipChainContentDescendants, asr, aClipChainOnStack);
InvalidateCurrentCombinedClipChain(asr);
}
void DisplayListClipState::InvalidateCurrentCombinedClipChain(
const ActiveScrolledRoot* aInvalidateUpTo) {
mClippedToDisplayPort = false;
mCurrentCombinedClipChainIsValid = false;
while (mCurrentCombinedClipChain &&
ActiveScrolledRoot::IsAncestor(aInvalidateUpTo,
mCurrentCombinedClipChain->mASR)) {
mCurrentCombinedClipChain = mCurrentCombinedClipChain->mParent;
}
}
void DisplayListClipState::ClipContainingBlockDescendantsToContentBox(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
DisplayItemClipChain& aClipChainOnStack, 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(
aBuilder, clipRect, hasBorderRadius ? radii : nullptr, aClipChainOnStack);
}
DisplayListClipState::AutoSaveRestore::AutoSaveRestore(
nsDisplayListBuilder* aBuilder)
: mBuilder(aBuilder),
mState(aBuilder->ClipState()),
mSavedState(aBuilder->ClipState())
#ifdef DEBUG
,
mClipUsed(false),
mRestored(false)
#endif
{
}
} // namespace mozilla
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