michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "DisplayListClipState.h"
michael@0: 
michael@0: #include "nsDisplayList.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: const DisplayItemClip*
michael@0: DisplayListClipState::GetCurrentCombinedClip(nsDisplayListBuilder* aBuilder)
michael@0: {
michael@0:   if (mCurrentCombinedClip) {
michael@0:     return mCurrentCombinedClip;
michael@0:   }
michael@0:   if (!mClipContentDescendants && !mClipContainingBlockDescendants) {
michael@0:     return nullptr;
michael@0:   }
michael@0:   if (mClipContentDescendants) {
michael@0:     if (mClipContainingBlockDescendants) {
michael@0:       DisplayItemClip intersection = *mClipContentDescendants;
michael@0:       intersection.IntersectWith(*mClipContainingBlockDescendants);
michael@0:       mCurrentCombinedClip = aBuilder->AllocateDisplayItemClip(intersection);
michael@0:     } else {
michael@0:       mCurrentCombinedClip =
michael@0:         aBuilder->AllocateDisplayItemClip(*mClipContentDescendants);
michael@0:     }
michael@0:   } else {
michael@0:     mCurrentCombinedClip =
michael@0:       aBuilder->AllocateDisplayItemClip(*mClipContainingBlockDescendants);
michael@0:   }
michael@0:   return mCurrentCombinedClip;
michael@0: }
michael@0: 
michael@0: void
michael@0: DisplayListClipState::ClipContainingBlockDescendants(const nsRect& aRect,
michael@0:                                                      const nscoord* aRadii,
michael@0:                                                      DisplayItemClip& aClipOnStack)
michael@0: {
michael@0:   if (aRadii) {
michael@0:     aClipOnStack.SetTo(aRect, aRadii);
michael@0:   } else {
michael@0:     aClipOnStack.SetTo(aRect);
michael@0:   }
michael@0:   if (mClipContainingBlockDescendants) {
michael@0:     aClipOnStack.IntersectWith(*mClipContainingBlockDescendants);
michael@0:   }
michael@0:   mClipContainingBlockDescendants = &aClipOnStack;
michael@0:   mCurrentCombinedClip = nullptr;
michael@0: }
michael@0: 
michael@0: void
michael@0: DisplayListClipState::ClipContentDescendants(const nsRect& aRect,
michael@0:                                              const nscoord* aRadii,
michael@0:                                              DisplayItemClip& aClipOnStack)
michael@0: {
michael@0:   if (aRadii) {
michael@0:     aClipOnStack.SetTo(aRect, aRadii);
michael@0:   } else {
michael@0:     aClipOnStack.SetTo(aRect);
michael@0:   }
michael@0:   if (mClipContentDescendants) {
michael@0:     aClipOnStack.IntersectWith(*mClipContentDescendants);
michael@0:   }
michael@0:   mClipContentDescendants = &aClipOnStack;
michael@0:   mCurrentCombinedClip = nullptr;
michael@0: }
michael@0: 
michael@0: void
michael@0: DisplayListClipState::ClipContainingBlockDescendantsToContentBox(nsDisplayListBuilder* aBuilder,
michael@0:                                                                  nsIFrame* aFrame,
michael@0:                                                                  DisplayItemClip& aClipOnStack,
michael@0:                                                                  uint32_t aFlags)
michael@0: {
michael@0:   nscoord radii[8];
michael@0:   bool hasBorderRadius = aFrame->GetContentBoxBorderRadii(radii);
michael@0:   if (!hasBorderRadius && (aFlags & ASSUME_DRAWING_RESTRICTED_TO_CONTENT_RECT)) {
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   nsRect clipRect = aFrame->GetContentRectRelativeToSelf() +
michael@0:     aBuilder->ToReferenceFrame(aFrame);
michael@0:   // If we have a border-radius, we have to clip our content to that
michael@0:   // radius.
michael@0:   ClipContainingBlockDescendants(clipRect, hasBorderRadius ? radii : nullptr,
michael@0:                                  aClipOnStack);
michael@0: }
michael@0: 
michael@0: DisplayListClipState::AutoSaveRestore::AutoSaveRestore(nsDisplayListBuilder* aBuilder)
michael@0:   : mState(aBuilder->ClipState())
michael@0:   , mSavedState(aBuilder->ClipState())
michael@0:   , mClipUsed(false)
michael@0:   , mRestored(false)
michael@0: {}
michael@0: 
michael@0: }