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93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 "DisplayListClipState.h"
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#include "nsDisplayList.h"
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namespace mozilla {
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const DisplayItemClip*
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DisplayListClipState::GetCurrentCombinedClip(nsDisplayListBuilder* aBuilder)
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{
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if (mCurrentCombinedClip) {
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return mCurrentCombinedClip;
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}
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if (!mClipContentDescendants && !mClipContainingBlockDescendants) {
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return nullptr;
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}
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void* mem = aBuilder->Allocate(sizeof(DisplayItemClip));
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if (mClipContentDescendants) {
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DisplayItemClip* newClip =
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new (mem) DisplayItemClip(*mClipContentDescendants);
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if (mClipContainingBlockDescendants) {
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newClip->IntersectWith(*mClipContainingBlockDescendants);
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}
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mCurrentCombinedClip = newClip;
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} else {
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mCurrentCombinedClip =
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new (mem) DisplayItemClip(*mClipContainingBlockDescendants);
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}
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return mCurrentCombinedClip;
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}
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void
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DisplayListClipState::ClipContainingBlockDescendants(const nsRect& aRect,
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const nscoord* aRadii,
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DisplayItemClip& aClipOnStack)
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{
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if (aRadii) {
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aClipOnStack.SetTo(aRect, aRadii);
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} else {
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aClipOnStack.SetTo(aRect);
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}
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if (mClipContainingBlockDescendants) {
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aClipOnStack.IntersectWith(*mClipContainingBlockDescendants);
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}
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mClipContainingBlockDescendants = &aClipOnStack;
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mCurrentCombinedClip = nullptr;
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}
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void
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DisplayListClipState::ClipContentDescendants(const nsRect& aRect,
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DisplayItemClip& aClipOnStack)
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{
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aClipOnStack.SetTo(aRect);
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if (mClipContentDescendants) {
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aClipOnStack.IntersectWith(*mClipContentDescendants);
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}
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mClipContentDescendants = &aClipOnStack;
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mCurrentCombinedClip = nullptr;
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}
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void
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DisplayListClipState::ClipContainingBlockDescendantsToContentBox(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame,
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DisplayItemClip& aClipOnStack,
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uint32_t aFlags)
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{
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nscoord radii[8];
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bool hasBorderRadius = aFrame->GetContentBoxBorderRadii(radii);
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if (!hasBorderRadius && (aFlags & ASSUME_DRAWING_RESTRICTED_TO_CONTENT_RECT)) {
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return;
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}
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nsRect clipRect = aFrame->GetContentRectRelativeToSelf() +
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aBuilder->ToReferenceFrame(aFrame);
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// If we have a border-radius, we have to clip our content to that
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// radius.
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ClipContainingBlockDescendants(clipRect, hasBorderRadius ? radii : nullptr,
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aClipOnStack);
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}
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DisplayListClipState::AutoSaveRestore::AutoSaveRestore(nsDisplayListBuilder* aBuilder)
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: mState(aBuilder->ClipState())
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, mSavedState(aBuilder->ClipState())
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, mClipUsed(false)
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, mRestored(false)
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{}
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}
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