/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla Corporation code. * * The Initial Developer of the Original Code is Mozilla Foundation. * Portions created by the Initial Developer are Copyright (C) 2010 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Robert O'Callahan * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "FrameLayerBuilder.h" #include "nsDisplayList.h" #include "nsPresContext.h" #include "nsLayoutUtils.h" #include "Layers.h" #include "BasicLayers.h" #include "nsSubDocumentFrame.h" #ifdef DEBUG #include #endif using namespace mozilla::layers; namespace mozilla { namespace { /** * This is the userdata we associate with a layer manager. */ class LayerManagerData { public: LayerManagerData() : mInvalidateAllThebesContent(PR_FALSE), mInvalidateAllLayers(PR_FALSE) { mFramesWithLayers.Init(); } /** * Tracks which frames have layers associated with them. */ nsTHashtable > mFramesWithLayers; PRPackedBool mInvalidateAllThebesContent; PRPackedBool mInvalidateAllLayers; }; static void DestroyRegion(void* aPropertyValue) { delete static_cast(aPropertyValue); } /** * This property represents a region that should be invalidated in every * ThebesLayer child whose parent ContainerLayer is associated with the * frame. This is an nsRegion*; the coordinates of the region are * relative to the top-left of the border-box of the frame the property * is attached to (which is the frame for the ContainerLayer). * * We add to this region in InvalidateThebesLayerContents. The region * is propagated to ContainerState in BuildContainerLayerFor, and then * the region(s) are actually invalidated in CreateOrRecycleThebesLayer. * * When the property value is null, the region is infinite --- i.e. all * areas of the ThebesLayers should be invalidated. */ NS_DECLARE_FRAME_PROPERTY(ThebesLayerInvalidRegionProperty, DestroyRegion) /** * This is a helper object used to build up the layer children for * a ContainerLayer. */ class ContainerState { public: ContainerState(nsDisplayListBuilder* aBuilder, LayerManager* aManager, nsIFrame* aContainerFrame, ContainerLayer* aContainerLayer) : mBuilder(aBuilder), mManager(aManager), mContainerFrame(aContainerFrame), mContainerLayer(aContainerLayer), mNextFreeRecycledThebesLayer(0), mNextFreeRecycledColorLayer(0), mInvalidateAllThebesContent(PR_FALSE) { CollectOldLayers(); } void SetInvalidThebesContent(const nsIntRegion& aRegion) { mInvalidThebesContent = aRegion; } void SetInvalidateAllThebesContent() { mInvalidateAllThebesContent = PR_TRUE; } /** * This is the method that actually walks a display list and builds * the child layers. We invoke it recursively to process clipped sublists. * @param aClipRect the clip rect to apply to the list items, or null * if no clipping is required */ void ProcessDisplayItems(const nsDisplayList& aList, const nsRect* aClipRect); /** * This finalizes all the open ThebesLayers by popping every element off * mThebesLayerDataStack, then sets the children of the container layer * to be all the layers in mNewChildLayers in that order and removes any * layers as children of the container that aren't in mNewChildLayers. */ void Finish(); protected: /** * We keep a stack of these to represent the ThebesLayers that are * currently available to have display items added to. * We use a stack here because as much as possible we want to * assign display items to existing ThebesLayers, and to the lowest * ThebesLayer in z-order. This reduces the number of layers and * makes it more likely a display item will be rendered to an opaque * layer, giving us the best chance of getting subpixel AA. */ class ThebesLayerData { public: ThebesLayerData() : mActiveScrolledRoot(nsnull), mLayer(nsnull), mIsSolidColorInVisibleRegion(PR_FALSE) {} /** * Record that an item has been added to the ThebesLayer, so we * need to update our regions. * @param aVisibleRect the area of the item that's visible * @param aDrawRect the area of the item that would be drawn if it * was completely visible * @param aOpaqueRect if non-null, the area of the item that's opaque. * We pass in a separate opaque rect because the opaque rect can be * bigger than the visible rect, and we want to have the biggest * opaque rect that we can. * @param aSolidColor if non-null, the visible area of the item is * a constant color given by *aSolidColor */ void Accumulate(const nsIntRect& aVisibleRect, const nsIntRect& aDrawRect, const nsIntRect* aOpaqueRect, nscolor* aSolidColor); nsIFrame* GetActiveScrolledRoot() { return mActiveScrolledRoot; } /** * The region of visible content in the layer, relative to the * container layer (which is at the snapped top-left of the display * list reference frame). */ nsIntRegion mVisibleRegion; /** * The region of visible content above the layer and below the * next ThebesLayerData currently in the stack, if any. Note that not * all ThebesLayers for the container are in the ThebesLayerData stack. * Same coordinate system as mVisibleRegion. */ nsIntRegion mVisibleAboveRegion; /** * The region containing the bounds of all display items in the layer, * regardless of visbility. * Same coordinate system as mVisibleRegion. */ nsIntRegion mDrawRegion; /** * The region containing the bounds of all display items (regardless * of visibility) in the layer and below the next ThebesLayerData * currently in the stack, if any. * Note that not all ThebesLayers for the container are in the * ThebesLayerData stack. * Same coordinate system as mVisibleRegion. */ nsIntRegion mDrawAboveRegion; /** * The region of visible content in the layer that is opaque. * Same coordinate system as mVisibleRegion. */ nsIntRegion mOpaqueRegion; /** * The "active scrolled root" for all content in the layer. Must * be non-null; all content in a ThebesLayer must have the same * active scrolled root. */ nsIFrame* mActiveScrolledRoot; ThebesLayer* mLayer; /** * If mIsSolidColorInVisibleRegion is true, this is the color of the visible * region. */ nscolor mSolidColor; /** * True if every pixel in mVisibleRegion will have color mSolidColor. */ PRPackedBool mIsSolidColorInVisibleRegion; }; /** * Grab the next recyclable ThebesLayer, or create one if there are no * more recyclable ThebesLayers. Does any necessary invalidation of * a recycled ThebesLayer, and sets up the transform on the ThebesLayer * to account for scrolling. */ already_AddRefed CreateOrRecycleThebesLayer(nsIFrame* aActiveScrolledRoot); /** * Grab the next recyclable ColorLayer, or create one if there are no * more recyclable ColorLayers. */ already_AddRefed CreateOrRecycleColorLayer(); /** * Grabs all ThebesLayers and ColorLayers from the ContainerLayer and makes them * available for recycling. */ void CollectOldLayers(); /** * If aItem used to belong to a ThebesLayer, invalidates the area of * aItem in that layer. If aNewLayer is a ThebesLayer, invalidates the area of * aItem in that layer. */ void InvalidateForLayerChange(nsDisplayItem* aItem, Layer* aNewLayer); /** * Indicate that we are done adding items to the ThebesLayer at the top of * mThebesLayerDataStack. Set the final visible region and opaque-content * flag, and pop it off the stack. */ void PopThebesLayerData(); /** * Find the ThebesLayer to which we should assign the next display item. * We scan the ThebesLayerData stack to find the topmost ThebesLayer * that is compatible with the display item (i.e., has the same * active scrolled root), and that has no content from other layers above * it and intersecting the aVisibleRect. * Returns the layer, and also updates the ThebesLayerData. Will * push a new ThebesLayerData onto the stack if no suitable existing * layer is found. If we choose a ThebesLayer that's already on the * ThebesLayerData stack, later elements on the stack will be popped off. * @param aVisibleRect the area of the next display item that's visible * @param aActiveScrolledRoot the active scrolled root for the next * display item * @param aOpaqueRect if non-null, a region of the display item that is opaque * @param aSolidColor if non-null, indicates that every pixel in aVisibleRect * will be painted with aSolidColor by the item */ already_AddRefed FindThebesLayerFor(const nsIntRect& aVisibleRect, const nsIntRect& aDrawRect, nsIFrame* aActiveScrolledRoot, const nsIntRect* aOpaqueRect, nscolor* aSolidColor); ThebesLayerData* GetTopThebesLayerData() { return mThebesLayerDataStack.IsEmpty() ? nsnull : mThebesLayerDataStack[mThebesLayerDataStack.Length() - 1].get(); } nsDisplayListBuilder* mBuilder; LayerManager* mManager; nsIFrame* mContainerFrame; ContainerLayer* mContainerLayer; /** * The region of ThebesLayers that should be invalidated every time * we recycle one. */ nsIntRegion mInvalidThebesContent; nsAutoTArray,1> mThebesLayerDataStack; /** * We collect the list of children in here. During ProcessDisplayItems, * the layers in this array either have mContainerLayer as their parent, * or no parent. */ nsAutoTArray,1> mNewChildLayers; nsTArray > mRecycledThebesLayers; nsTArray > mRecycledColorLayers; PRUint32 mNextFreeRecycledThebesLayer; PRUint32 mNextFreeRecycledColorLayer; PRPackedBool mInvalidateAllThebesContent; }; /** * The address of gThebesDisplayItemLayerUserData is used as the user * data pointer for ThebesLayers created by FrameLayerBuilder. * It identifies ThebesLayers used to draw non-layer content, which are * therefore eligible for recycling. We want display items to be able to * create their own dedicated ThebesLayers in BuildLayer, if necessary, * and we wouldn't want to accidentally recycle those. */ static PRUint8 gThebesDisplayItemLayerUserData; /** * The address of gColorLayerUserData is used as the user * data pointer for ColorLayers */ static PRUint8 gColorLayerUserData; } // anonymous namespace PRBool FrameLayerBuilder::DisplayItemDataEntry::HasContainerLayer() { for (PRUint32 i = 0; i < mData.Length(); ++i) { if (mData[i].mLayer->GetType() == Layer::TYPE_CONTAINER) return PR_TRUE; } return PR_FALSE; } /* static */ void FrameLayerBuilder::InternalDestroyDisplayItemData(nsIFrame* aFrame, void* aPropertyValue, PRBool aRemoveFromFramesWithLayers) { nsRefPtr managerRef; nsTArray* array = reinterpret_cast*>(&aPropertyValue); NS_ASSERTION(!array->IsEmpty(), "Empty arrays should not be stored"); if (aRemoveFromFramesWithLayers) { LayerManager* manager = array->ElementAt(0).mLayer->Manager(); LayerManagerData* data = static_cast (manager->GetUserData()); NS_ASSERTION(data, "Frame with layer should have been recorded"); data->mFramesWithLayers.RemoveEntry(aFrame); if (data->mFramesWithLayers.Count() == 0) { delete data; manager->SetUserData(nsnull); // Consume the reference we added when we set the user data // in DidEndTransaction. But don't actually release until we've // released all the layers in the DisplayItemData array below! managerRef = manager; NS_RELEASE(manager); } } array->~nsTArray(); } /* static */ void FrameLayerBuilder::DestroyDisplayItemData(nsIFrame* aFrame, void* aPropertyValue) { InternalDestroyDisplayItemData(aFrame, aPropertyValue, PR_TRUE); } void FrameLayerBuilder::WillBeginRetainedLayerTransaction(LayerManager* aManager) { mRetainingManager = aManager; LayerManagerData* data = static_cast (aManager->GetUserData()); if (data) { mInvalidateAllThebesContent = data->mInvalidateAllThebesContent; mInvalidateAllLayers = data->mInvalidateAllLayers; } } /** * A helper function to remove the mThebesLayerItems entries for every * layer in aLayer's subtree. */ void FrameLayerBuilder::RemoveThebesItemsForLayerSubtree(Layer* aLayer) { ThebesLayer* thebes = aLayer->AsThebesLayer(); if (thebes) { mThebesLayerItems.RemoveEntry(thebes); return; } for (Layer* child = aLayer->GetFirstChild(); child; child = child->GetNextSibling()) { RemoveThebesItemsForLayerSubtree(child); } } void FrameLayerBuilder::DidEndTransaction(LayerManager* aManager) { if (aManager != mRetainingManager) { Layer* root = aManager->GetRoot(); if (root) { RemoveThebesItemsForLayerSubtree(root); } } } void FrameLayerBuilder::WillEndTransaction(LayerManager* aManager) { if (aManager != mRetainingManager) return; // We need to save the data we'll need to support retaining. We do this // before we paint so that invalidation triggered by painting will // be able to update the ThebesLayerInvalidRegionProperty values // correctly and the NS_FRAME_HAS_CONTAINER_LAYER bits will be set // correctly. LayerManagerData* data = static_cast (mRetainingManager->GetUserData()); if (data) { // Update all the frames that used to have layers. data->mFramesWithLayers.EnumerateEntries(UpdateDisplayItemDataForFrame, this); } else { data = new LayerManagerData(); mRetainingManager->SetUserData(data); // Addref mRetainingManager. We'll release it when 'data' is // removed. NS_ADDREF(mRetainingManager); } // Now go through all the frames that didn't have any retained // display items before, and record those retained display items. // This also empties mNewDisplayItemData. mNewDisplayItemData.EnumerateEntries(StoreNewDisplayItemData, data); data->mInvalidateAllThebesContent = PR_FALSE; data->mInvalidateAllLayers = PR_FALSE; NS_ASSERTION(data->mFramesWithLayers.Count() > 0, "Some frame must have a layer!"); } /* static */ PLDHashOperator FrameLayerBuilder::UpdateDisplayItemDataForFrame(nsPtrHashKey* aEntry, void* aUserArg) { FrameLayerBuilder* builder = static_cast(aUserArg); nsIFrame* f = aEntry->GetKey(); FrameProperties props = f->Properties(); DisplayItemDataEntry* newDisplayItems = builder->mNewDisplayItemData.GetEntry(f); if (!newDisplayItems) { // This frame was visible, but isn't anymore. PRBool found; void* prop = props.Remove(DisplayItemDataProperty(), &found); NS_ASSERTION(found, "How can the frame property be missing?"); // Pass PR_FALSE to not remove from mFramesWithLayers, we'll remove it // by returning PL_DHASH_REMOVE below. // Note that DestroyDisplayItemData would delete the user data // for the retained layer manager if it removed the last entry from // mFramesWithLayers, but we won't. That's OK because our caller // is DidEndTransaction, which would recreate the user data // anyway. InternalDestroyDisplayItemData(f, prop, PR_FALSE); props.Delete(ThebesLayerInvalidRegionProperty()); f->RemoveStateBits(NS_FRAME_HAS_CONTAINER_LAYER); return PL_DHASH_REMOVE; } if (newDisplayItems->HasContainerLayer()) { // Reset or create the invalid region now so we can start collecting // new dirty areas. // Note that the NS_FRAME_HAS_CONTAINER_LAYER bit is set in // BuildContainerLayerFor, so we don't need to set it here. nsRegion* invalidRegion = static_cast (props.Get(ThebesLayerInvalidRegionProperty())); if (invalidRegion) { invalidRegion->SetEmpty(); } else { props.Set(ThebesLayerInvalidRegionProperty(), new nsRegion()); } } else { props.Delete(ThebesLayerInvalidRegionProperty()); f->RemoveStateBits(NS_FRAME_HAS_CONTAINER_LAYER); } // We need to remove and re-add the DisplayItemDataProperty in // case the nsTArray changes the value of its mHdr. void* propValue = props.Remove(DisplayItemDataProperty()); NS_ASSERTION(propValue, "mFramesWithLayers out of sync"); PR_STATIC_ASSERT(sizeof(nsTArray) == sizeof(void*)); nsTArray* array = reinterpret_cast*>(&propValue); // Steal the list of display item layers array->SwapElements(newDisplayItems->mData); props.Set(DisplayItemDataProperty(), propValue); // Don't need to process this frame again builder->mNewDisplayItemData.RawRemoveEntry(newDisplayItems); return PL_DHASH_NEXT; } /* static */ PLDHashOperator FrameLayerBuilder::StoreNewDisplayItemData(DisplayItemDataEntry* aEntry, void* aUserArg) { LayerManagerData* data = static_cast(aUserArg); nsIFrame* f = aEntry->GetKey(); FrameProperties props = f->Properties(); // Remember that this frame has display items in retained layers NS_ASSERTION(!data->mFramesWithLayers.GetEntry(f), "We shouldn't get here if we're already in mFramesWithLayers"); data->mFramesWithLayers.PutEntry(f); NS_ASSERTION(!props.Get(DisplayItemDataProperty()), "mFramesWithLayers out of sync"); void* propValue; nsTArray* array = new (&propValue) nsTArray(); // Steal the list of display item layers array->SwapElements(aEntry->mData); // Save it props.Set(DisplayItemDataProperty(), propValue); if (f->GetStateBits() & NS_FRAME_HAS_CONTAINER_LAYER) { props.Set(ThebesLayerInvalidRegionProperty(), new nsRegion()); } return PL_DHASH_REMOVE; } Layer* FrameLayerBuilder::GetOldLayerFor(nsIFrame* aFrame, PRUint32 aDisplayItemKey) { // If we need to build a new layer tree, then just refuse to recycle // anything. if (!mRetainingManager || mInvalidateAllLayers) return nsnull; void* propValue = aFrame->Properties().Get(DisplayItemDataProperty()); if (!propValue) return nsnull; nsTArray* array = (reinterpret_cast*>(&propValue)); for (PRUint32 i = 0; i < array->Length(); ++i) { if (array->ElementAt(i).mDisplayItemKey == aDisplayItemKey) { Layer* layer = array->ElementAt(i).mLayer; if (layer->Manager() == mRetainingManager) return layer; } } return nsnull; } /** * Invalidate aRegion in aLayer. aLayer is in the coordinate system * *after* aLayer's transform has been applied, so we need to * apply the inverse of that transform before calling InvalidateRegion. * Currently we assume that the transform is just an integer translation, * since that's all we need for scrolling. */ static void InvalidatePostTransformRegion(ThebesLayer* aLayer, const nsIntRegion& aRegion) { gfxMatrix transform; if (aLayer->GetTransform().Is2D(&transform)) { NS_ASSERTION(!transform.HasNonIntegerTranslation(), "Matrix not just an integer translation?"); // Convert the region from the coordinates of the container layer // (relative to the snapped top-left of the display list reference frame) // to the ThebesLayer's own coordinates nsIntRegion rgn = aRegion; rgn.MoveBy(-nsIntPoint(PRInt32(transform.x0), PRInt32(transform.y0))); aLayer->InvalidateRegion(rgn); } else { NS_ERROR("Only 2D transformations currently supported"); } } already_AddRefed ContainerState::CreateOrRecycleColorLayer() { nsRefPtr layer; if (mNextFreeRecycledColorLayer < mRecycledColorLayers.Length()) { // Recycle a layer layer = mRecycledColorLayers[mNextFreeRecycledColorLayer]; ++mNextFreeRecycledColorLayer; // Clear clip rect so we don't accidentally stay clipped. We will // reapply any necessary clipping. layer->SetClipRect(nsnull); } else { // Create a new layer layer = mManager->CreateColorLayer(); if (!layer) return nsnull; // Mark this layer as being used for Thebes-painting display items layer->SetUserData(&gColorLayerUserData); } return layer.forget(); } already_AddRefed ContainerState::CreateOrRecycleThebesLayer(nsIFrame* aActiveScrolledRoot) { // We need a new thebes layer nsRefPtr layer; if (mNextFreeRecycledThebesLayer < mRecycledThebesLayers.Length()) { // Recycle a layer layer = mRecycledThebesLayers[mNextFreeRecycledThebesLayer]; ++mNextFreeRecycledThebesLayer; // Clear clip rect so we don't accidentally stay clipped. We will // reapply any necessary clipping. layer->SetClipRect(nsnull); // This gets called on recycled ThebesLayers that are going to be in the // final layer tree, so it's a convenient time to invalidate the // content that changed where we don't know what ThebesLayer it belonged // to, or if we need to invalidate the entire layer, we can do that. // This needs to be done before we update the ThebesLayer to its new // transform. See nsGfxScrollFrame::InvalidateInternal, where // we ensure that mInvalidThebesContent is updated according to the // scroll position as of the most recent paint. if (mInvalidateAllThebesContent) { nsIntRect invalidate = layer->GetValidRegion().GetBounds(); layer->InvalidateRegion(invalidate); } else { InvalidatePostTransformRegion(layer, mInvalidThebesContent); } // We do not need to Invalidate these areas in the widget because we // assume the caller of InvalidateThebesLayerContents or // InvalidateAllThebesLayerContents has ensured // the area is invalidated in the widget. } else { // Create a new thebes layer layer = mManager->CreateThebesLayer(); if (!layer) return nsnull; // Mark this layer as being used for Thebes-painting display items layer->SetUserData(&gThebesDisplayItemLayerUserData); } // Set up transform so that 0,0 in the Thebes layer corresponds to the // (pixel-snapped) top-left of the aActiveScrolledRoot. nsPoint offset = mBuilder->ToReferenceFrame(aActiveScrolledRoot); nsIntPoint pixOffset = offset.ToNearestPixels( aActiveScrolledRoot->PresContext()->AppUnitsPerDevPixel()); gfxMatrix matrix; matrix.Translate(gfxPoint(pixOffset.x, pixOffset.y)); layer->SetTransform(gfx3DMatrix::From2D(matrix)); return layer.forget(); } /** * Returns the appunits per dev pixel for the item's frame. The item must * have a frame because only nsDisplayClip items don't have a frame, * and those items are flattened away by ProcessDisplayItems. */ static PRUint32 AppUnitsPerDevPixel(nsDisplayItem* aItem) { // The underlying frame for zoom items is the root frame of the subdocument. // But zoom display items report their bounds etc using the parent document's // APD because zoom items act as a conversion layer between the two different // APDs. if (aItem->GetType() == nsDisplayItem::TYPE_ZOOM) { return static_cast(aItem)->GetParentAppUnitsPerDevPixel(); } return aItem->GetUnderlyingFrame()->PresContext()->AppUnitsPerDevPixel(); } /** * Set the visible rect of aLayer. aLayer is in the coordinate system * *after* aLayer's transform has been applied, so we need to * apply the inverse of that transform before calling SetVisibleRegion. */ static void SetVisibleRectForLayer(Layer* aLayer, const nsIntRect& aRect) { gfxMatrix transform; if (aLayer->GetTransform().Is2D(&transform)) { // if 'transform' is not invertible, then nothing will be displayed // for the layer, so it doesn't really matter what we do here transform.Invert(); gfxRect layerVisible = transform.TransformBounds( gfxRect(aRect.x, aRect.y, aRect.width, aRect.height)); layerVisible.RoundOut(); nsIntRect visibleRect; if (NS_FAILED(nsLayoutUtils::GfxRectToIntRect(layerVisible, &visibleRect))) { visibleRect = nsIntRect(0, 0, 0, 0); NS_WARNING("Visible rect transformed out of bounds"); } aLayer->SetVisibleRegion(visibleRect); } else { NS_ERROR("Only 2D transformations currently supported"); } } void ContainerState::PopThebesLayerData() { NS_ASSERTION(!mThebesLayerDataStack.IsEmpty(), "Can't pop"); PRInt32 lastIndex = mThebesLayerDataStack.Length() - 1; ThebesLayerData* data = mThebesLayerDataStack[lastIndex]; if (lastIndex > 0) { // Since we're going to pop off the last ThebesLayerData, the // mVisibleAboveRegion of the second-to-last item will need to include // the regions of the last item. ThebesLayerData* nextData = mThebesLayerDataStack[lastIndex - 1]; nextData->mVisibleAboveRegion.Or(nextData->mVisibleAboveRegion, data->mVisibleAboveRegion); nextData->mVisibleAboveRegion.Or(nextData->mVisibleAboveRegion, data->mVisibleRegion); nextData->mDrawAboveRegion.Or(nextData->mDrawAboveRegion, data->mDrawAboveRegion); nextData->mDrawAboveRegion.Or(nextData->mDrawAboveRegion, data->mDrawRegion); } Layer* layer; if (data->mIsSolidColorInVisibleRegion) { nsRefPtr colorLayer = CreateOrRecycleColorLayer(); colorLayer->SetColor(data->mSolidColor); NS_ASSERTION(!mNewChildLayers.Contains(colorLayer), "Layer already in list???"); nsTArray_base::index_type index = mNewChildLayers.IndexOf(data->mLayer); NS_ASSERTION(index != nsTArray_base::NoIndex, "Thebes layer not found?"); mNewChildLayers.InsertElementAt(index + 1, colorLayer); // Copy transform and clip rect colorLayer->SetTransform(data->mLayer->GetTransform()); // Clip colorLayer to its visible region, since ColorLayers are // allowed to paint outside the visible region. Here we rely on the // fact that uniform display items fill rectangles; obviously the // area to fill must contain the visible region, and because it's // a rectangle, it must therefore contain the visible region's GetBounds. // Note that the visible region is already clipped appropriately. nsIntRect visibleRect = data->mVisibleRegion.GetBounds(); colorLayer->SetClipRect(&visibleRect); // Hide the ThebesLayer. We leave it in the layer tree so that we // can find and recycle it later. data->mLayer->IntersectClipRect(nsIntRect()); data->mLayer->SetVisibleRegion(nsIntRegion()); layer = colorLayer; } else { layer = data->mLayer; } gfxMatrix transform; if (layer->GetTransform().Is2D(&transform)) { NS_ASSERTION(!transform.HasNonIntegerTranslation(), "Matrix not just an integer translation?"); // Convert from relative to the container to relative to the // ThebesLayer itself. nsIntRegion rgn = data->mVisibleRegion; rgn.MoveBy(-nsIntPoint(PRInt32(transform.x0), PRInt32(transform.y0))); layer->SetVisibleRegion(rgn); } else { NS_ERROR("Only 2D transformations currently supported"); } nsIntRegion transparentRegion; transparentRegion.Sub(data->mVisibleRegion, data->mOpaqueRegion); layer->SetIsOpaqueContent(transparentRegion.IsEmpty()); mThebesLayerDataStack.RemoveElementAt(lastIndex); } void ContainerState::ThebesLayerData::Accumulate(const nsIntRect& aVisibleRect, const nsIntRect& aDrawRect, const nsIntRect* aOpaqueRect, nscolor* aSolidColor) { if (aSolidColor) { if (mVisibleRegion.IsEmpty()) { // This color is all we have mSolidColor = *aSolidColor; mIsSolidColorInVisibleRegion = PR_TRUE; } else if (mIsSolidColorInVisibleRegion && mVisibleRegion.IsEqual(nsIntRegion(aVisibleRect))) { // we can just blend the colors together mSolidColor = NS_ComposeColors(mSolidColor, *aSolidColor); } else { mIsSolidColorInVisibleRegion = PR_FALSE; } } else { mIsSolidColorInVisibleRegion = PR_FALSE; } mVisibleRegion.Or(mVisibleRegion, aVisibleRect); mVisibleRegion.SimplifyOutward(4); mDrawRegion.Or(mDrawRegion, aDrawRect); mDrawRegion.SimplifyOutward(4); if (aOpaqueRect) { // We don't use SimplifyInward here since it's not defined exactly // what it will discard. For our purposes the most important case // is a large opaque background at the bottom of z-order (e.g., // a canvas background), so we need to make sure that the first rect // we see doesn't get discarded. nsIntRegion tmp; tmp.Or(mOpaqueRegion, *aOpaqueRect); if (tmp.GetNumRects() <= 4) { mOpaqueRegion = tmp; } } } already_AddRefed ContainerState::FindThebesLayerFor(const nsIntRect& aVisibleRect, const nsIntRect& aDrawRect, nsIFrame* aActiveScrolledRoot, const nsIntRect* aOpaqueRect, nscolor* aSolidColor) { PRInt32 i; PRInt32 lowestUsableLayerWithScrolledRoot = -1; PRInt32 topmostLayerWithScrolledRoot = -1; for (i = mThebesLayerDataStack.Length() - 1; i >= 0; --i) { ThebesLayerData* data = mThebesLayerDataStack[i]; if (data->mDrawAboveRegion.Intersects(aVisibleRect)) { ++i; break; } if (data->mActiveScrolledRoot == aActiveScrolledRoot) { lowestUsableLayerWithScrolledRoot = i; if (topmostLayerWithScrolledRoot < 0) { topmostLayerWithScrolledRoot = i; } } if (data->mDrawRegion.Intersects(aVisibleRect)) break; } if (topmostLayerWithScrolledRoot < 0) { --i; for (; i >= 0; --i) { ThebesLayerData* data = mThebesLayerDataStack[i]; if (data->mActiveScrolledRoot == aActiveScrolledRoot) { topmostLayerWithScrolledRoot = i; break; } } } if (topmostLayerWithScrolledRoot >= 0) { while (PRUint32(topmostLayerWithScrolledRoot + 1) < mThebesLayerDataStack.Length()) { PopThebesLayerData(); } } nsRefPtr layer; ThebesLayerData* thebesLayerData = nsnull; if (lowestUsableLayerWithScrolledRoot < 0) { layer = CreateOrRecycleThebesLayer(aActiveScrolledRoot); NS_ASSERTION(!mNewChildLayers.Contains(layer), "Layer already in list???"); mNewChildLayers.AppendElement(layer); thebesLayerData = new ThebesLayerData(); mThebesLayerDataStack.AppendElement(thebesLayerData); thebesLayerData->mLayer = layer; thebesLayerData->mActiveScrolledRoot = aActiveScrolledRoot; } else { thebesLayerData = mThebesLayerDataStack[lowestUsableLayerWithScrolledRoot]; layer = thebesLayerData->mLayer; } thebesLayerData->Accumulate(aVisibleRect, aDrawRect, aOpaqueRect, aSolidColor); return layer.forget(); } static already_AddRefed BuildTempManagerForInactiveLayer(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { // This item has an inactive layer. We will render it to a ThebesLayer // using a temporary BasicLayerManager. Set up the layer // manager now so that if we need to modify the retained layer // tree during this process, those modifications will happen // during the construction phase for the retained layer tree. nsRefPtr tempManager = new BasicLayerManager(); tempManager->BeginTransaction(); nsRefPtr layer = aItem->BuildLayer(aBuilder, tempManager); if (!layer) { tempManager->EndTransaction(nsnull, nsnull); return nsnull; } PRInt32 appUnitsPerDevPixel = AppUnitsPerDevPixel(aItem); nsIntRect itemVisibleRect = aItem->GetVisibleRect().ToNearestPixels(appUnitsPerDevPixel); SetVisibleRectForLayer(layer, itemVisibleRect); tempManager->SetRoot(layer); // No painting should occur yet, since there is no target context. tempManager->EndTransaction(nsnull, nsnull); return tempManager.forget(); } /* * Iterate through the non-clip items in aList and its descendants. * For each item we compute the effective clip rect. Each item is assigned * to a layer. We invalidate the areas in ThebesLayers where an item * has moved from one ThebesLayer to another. Also, * aState->mInvalidThebesContent is invalidated in every ThebesLayer. * We set the clip rect for items that generated their own layer. * (ThebesLayers don't need a clip rect on the layer, we clip the items * individually when we draw them.) * We set the visible rect for all layers, although the actual setting * of visible rects for some ThebesLayers is deferred until the calling * of ContainerState::Finish. */ void ContainerState::ProcessDisplayItems(const nsDisplayList& aList, const nsRect* aClipRect) { PRInt32 appUnitsPerDevPixel = mContainerFrame->PresContext()->AppUnitsPerDevPixel(); for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) { if (item->GetType() == nsDisplayItem::TYPE_CLIP) { nsDisplayClip* clipItem = static_cast(item); nsRect clip = clipItem->GetClipRect(); if (aClipRect) { clip.IntersectRect(clip, *aClipRect); } ProcessDisplayItems(*clipItem->GetList(), &clip); continue; } NS_ASSERTION(appUnitsPerDevPixel == AppUnitsPerDevPixel(item), "items in a container layer should all have the same app units per dev pixel"); nsIntRect itemVisibleRect = item->GetVisibleRect().ToNearestPixels(appUnitsPerDevPixel); nsRect itemContent = item->GetBounds(mBuilder); if (aClipRect) { itemContent.IntersectRect(*aClipRect, itemContent); } nsIntRect itemDrawRect = itemContent.ToNearestPixels(appUnitsPerDevPixel); nsDisplayItem::LayerState layerState = item->GetLayerState(mBuilder, mManager); // Assign the item to a layer if (layerState == LAYER_ACTIVE) { // If the item would have its own layer but is invisible, just hide it. // Note that items without their own layers can't be skipped this // way, since their ThebesLayer may decide it wants to draw them // into its buffer even if they're currently covered. if (itemVisibleRect.IsEmpty()) { InvalidateForLayerChange(item, nsnull); continue; } // Just use its layer. nsRefPtr ownLayer = item->BuildLayer(mBuilder, mManager); if (!ownLayer) { InvalidateForLayerChange(item, ownLayer); continue; } // Update that layer's clip and visible rects. NS_ASSERTION(ownLayer->Manager() == mManager, "Wrong manager"); NS_ASSERTION(ownLayer->GetUserData() != &gThebesDisplayItemLayerUserData, "We shouldn't have a FrameLayerBuilder-managed layer here!"); // It has its own layer. Update that layer's clip and visible rects. if (aClipRect) { ownLayer->IntersectClipRect( aClipRect->ToNearestPixels(appUnitsPerDevPixel)); } ThebesLayerData* data = GetTopThebesLayerData(); if (data) { data->mVisibleAboveRegion.Or(data->mVisibleAboveRegion, itemVisibleRect); // Add the entire bounds rect to the mDrawAboveRegion. // The visible region may be excluding opaque content above the // item, and we need to ensure that that content is not placed // in a ThebesLayer below the item! data->mDrawAboveRegion.Or(data->mDrawAboveRegion, itemDrawRect); } SetVisibleRectForLayer(ownLayer, itemVisibleRect); ContainerLayer* oldContainer = ownLayer->GetParent(); if (oldContainer && oldContainer != mContainerLayer) { oldContainer->RemoveChild(ownLayer); } NS_ASSERTION(!mNewChildLayers.Contains(ownLayer), "Layer already in list???"); InvalidateForLayerChange(item, ownLayer); mNewChildLayers.AppendElement(ownLayer); mBuilder->LayerBuilder()->AddLayerDisplayItem(ownLayer, item); } else { nsRefPtr tempLayerManager; if (layerState == LAYER_INACTIVE) { tempLayerManager = BuildTempManagerForInactiveLayer(mBuilder, item); if (!tempLayerManager) continue; } nsIFrame* f = item->GetUnderlyingFrame(); nsIFrame* activeScrolledRoot = nsLayoutUtils::GetActiveScrolledRootFor(f, mBuilder->ReferenceFrame()); if (item->IsFixedAndCoveringViewport(mBuilder)) { // Make its active scrolled root be the active scrolled root of // the enclosing viewport, since it shouldn't be scrolled by scrolled // frames in its document. InvalidateFixedBackgroundFramesFromList in // nsGfxScrollFrame will not repaint this item when scrolling occurs. nsIFrame* viewportFrame = nsLayoutUtils::GetClosestFrameOfType(f, nsGkAtoms::viewportFrame); NS_ASSERTION(viewportFrame, "no viewport???"); activeScrolledRoot = nsLayoutUtils::GetActiveScrolledRootFor(viewportFrame, mBuilder->ReferenceFrame()); } nscolor uniformColor; PRBool isUniform = item->IsUniform(mBuilder, &uniformColor); PRBool isOpaque = item->IsOpaque(mBuilder); nsIntRect opaqueRect; if (isOpaque) { opaqueRect = item->GetBounds(mBuilder).ToNearestPixels(appUnitsPerDevPixel); } nsRefPtr thebesLayer = FindThebesLayerFor(itemVisibleRect, itemDrawRect, activeScrolledRoot, isOpaque ? &opaqueRect : nsnull, isUniform ? &uniformColor : nsnull); InvalidateForLayerChange(item, thebesLayer); mBuilder->LayerBuilder()-> AddThebesDisplayItem(thebesLayer, item, aClipRect, mContainerFrame, layerState, tempLayerManager); } } } void ContainerState::InvalidateForLayerChange(nsDisplayItem* aItem, Layer* aNewLayer) { nsIFrame* f = aItem->GetUnderlyingFrame(); NS_ASSERTION(f, "Display items that render using Thebes must have a frame"); PRUint32 key = aItem->GetPerFrameKey(); NS_ASSERTION(key, "Display items that render using Thebes must have a key"); Layer* oldLayer = mBuilder->LayerBuilder()->GetOldLayerFor(f, key); if (!oldLayer) { // Nothing to do here, this item didn't have a layer before return; } if (aNewLayer != oldLayer) { // The item has changed layers. // Invalidate the bounds in the old layer and new layer. // The bounds might have changed, but we assume that any difference // in the bounds will have been invalidated for all Thebes layers // in the container via regular frame invalidation. nsRect bounds = aItem->GetBounds(mBuilder); PRInt32 appUnitsPerDevPixel = AppUnitsPerDevPixel(aItem); nsIntRect r = bounds.ToOutsidePixels(appUnitsPerDevPixel); ThebesLayer* t = oldLayer->AsThebesLayer(); if (t) { InvalidatePostTransformRegion(t, r); } if (aNewLayer) { ThebesLayer* newLayer = aNewLayer->AsThebesLayer(); if (newLayer) { InvalidatePostTransformRegion(newLayer, r); } } NS_ASSERTION(appUnitsPerDevPixel == mContainerFrame->PresContext()->AppUnitsPerDevPixel(), "app units per dev pixel should be constant in a container"); mContainerFrame->InvalidateWithFlags( bounds - mBuilder->ToReferenceFrame(mContainerFrame), nsIFrame::INVALIDATE_NO_THEBES_LAYERS | nsIFrame::INVALIDATE_EXCLUDE_CURRENT_PAINT); } } void FrameLayerBuilder::AddThebesDisplayItem(ThebesLayer* aLayer, nsDisplayItem* aItem, const nsRect* aClipRect, nsIFrame* aContainerLayerFrame, LayerState aLayerState, LayerManager* aTempManager) { AddLayerDisplayItem(aLayer, aItem); ThebesLayerItemsEntry* entry = mThebesLayerItems.PutEntry(aLayer); if (entry) { entry->mContainerLayerFrame = aContainerLayerFrame; NS_ASSERTION(aItem->GetUnderlyingFrame(), "Must have frame"); ClippedDisplayItem* cdi = entry->mItems.AppendElement(ClippedDisplayItem(aItem, aClipRect)); cdi->mTempLayerManager = aTempManager; } } void FrameLayerBuilder::AddLayerDisplayItem(Layer* aLayer, nsDisplayItem* aItem) { if (aLayer->Manager() != mRetainingManager) return; nsIFrame* f = aItem->GetUnderlyingFrame(); DisplayItemDataEntry* entry = mNewDisplayItemData.PutEntry(f); if (entry) { entry->mData.AppendElement(DisplayItemData(aLayer, aItem->GetPerFrameKey())); } } void ContainerState::CollectOldLayers() { for (Layer* layer = mContainerLayer->GetFirstChild(); layer; layer = layer->GetNextSibling()) { void* data = layer->GetUserData(); if (data == &gColorLayerUserData) { mRecycledColorLayers.AppendElement(static_cast(layer)); } else if (data == &gThebesDisplayItemLayerUserData) { NS_ASSERTION(layer->AsThebesLayer(), "Wrong layer type"); mRecycledThebesLayers.AppendElement(static_cast(layer)); } } } void ContainerState::Finish() { while (!mThebesLayerDataStack.IsEmpty()) { PopThebesLayerData(); } for (PRUint32 i = 0; i <= mNewChildLayers.Length(); ++i) { // An invariant of this loop is that the layers in mNewChildLayers // with index < i are the first i child layers of mContainerLayer. Layer* layer; if (i < mNewChildLayers.Length()) { layer = mNewChildLayers[i]; if (!layer->GetParent()) { // This is not currently a child of the container, so just add it // now. Layer* prevChild = i == 0 ? nsnull : mNewChildLayers[i - 1].get(); mContainerLayer->InsertAfter(layer, prevChild); continue; } NS_ASSERTION(layer->GetParent() == mContainerLayer, "Layer shouldn't be the child of some other container"); } else { layer = nsnull; } // If layer is non-null, then it's already a child of the container, // so scan forward until we find it, removing the other layers we // don't want here. // If it's null, scan forward until we've removed all the leftover // children. Layer* nextOldChild = i == 0 ? mContainerLayer->GetFirstChild() : mNewChildLayers[i - 1]->GetNextSibling(); while (nextOldChild != layer) { Layer* tmp = nextOldChild; nextOldChild = nextOldChild->GetNextSibling(); mContainerLayer->RemoveChild(tmp); } // If non-null, 'layer' is now in the right place in the list, so we // can just move on to the next one. } } static void SetHasContainerLayer(nsIFrame* aFrame) { aFrame->AddStateBits(NS_FRAME_HAS_CONTAINER_LAYER); for (nsIFrame* f = aFrame; f && !(f->GetStateBits() & NS_FRAME_HAS_CONTAINER_LAYER_DESCENDANT); f = nsLayoutUtils::GetCrossDocParentFrame(f)) { f->AddStateBits(NS_FRAME_HAS_CONTAINER_LAYER_DESCENDANT); } } already_AddRefed FrameLayerBuilder::BuildContainerLayerFor(nsDisplayListBuilder* aBuilder, LayerManager* aManager, nsIFrame* aContainerFrame, nsDisplayItem* aContainerItem, const nsDisplayList& aChildren) { FrameProperties props = aContainerFrame->Properties(); PRUint32 containerDisplayItemKey = aContainerItem ? aContainerItem->GetPerFrameKey() : 0; NS_ASSERTION(aContainerFrame, "Container display items here should have a frame"); NS_ASSERTION(!aContainerItem || aContainerItem->GetUnderlyingFrame() == aContainerFrame, "Container display item must match given frame"); nsRefPtr containerLayer; if (aManager == mRetainingManager) { Layer* oldLayer = GetOldLayerFor(aContainerFrame, containerDisplayItemKey); if (oldLayer) { NS_ASSERTION(oldLayer->Manager() == aManager, "Wrong manager"); if (oldLayer->GetUserData() == &gThebesDisplayItemLayerUserData) { // The old layer for this item is actually our ThebesLayer // because we rendered its layer into that ThebesLayer. So we // don't actually have a retained container layer. } else { NS_ASSERTION(oldLayer->GetType() == Layer::TYPE_CONTAINER, "Wrong layer type"); containerLayer = static_cast(oldLayer); // Clear clip rect; the caller will set it if necessary. containerLayer->SetClipRect(nsnull); } } } if (!containerLayer) { // No suitable existing layer was found. containerLayer = aManager->CreateContainerLayer(); if (!containerLayer) return nsnull; } ContainerState state(aBuilder, aManager, aContainerFrame, containerLayer); if (aManager == mRetainingManager) { DisplayItemDataEntry* entry = mNewDisplayItemData.PutEntry(aContainerFrame); if (entry) { entry->mData.AppendElement( DisplayItemData(containerLayer, containerDisplayItemKey)); } if (mInvalidateAllThebesContent) { state.SetInvalidateAllThebesContent(); } nsRegion* invalidThebesContent(static_cast (props.Get(ThebesLayerInvalidRegionProperty()))); if (invalidThebesContent) { nsPoint offset = aBuilder->ToReferenceFrame(aContainerFrame); invalidThebesContent->MoveBy(offset); state.SetInvalidThebesContent(invalidThebesContent-> ToOutsidePixels(aContainerFrame->PresContext()->AppUnitsPerDevPixel())); // We have to preserve the current contents of invalidThebesContent // because there might be multiple container layers for the same // frame and we need to invalidate the ThebesLayer children of all // of them. invalidThebesContent->MoveBy(-offset); } else { // The region was deleted to indicate that everything should be // invalidated. state.SetInvalidateAllThebesContent(); } SetHasContainerLayer(aContainerFrame); } state.ProcessDisplayItems(aChildren, nsnull); state.Finish(); containerLayer->SetIsOpaqueContent(aChildren.IsOpaque()); return containerLayer.forget(); } Layer* FrameLayerBuilder::GetLeafLayerFor(nsDisplayListBuilder* aBuilder, LayerManager* aManager, nsDisplayItem* aItem) { if (aManager != mRetainingManager) return nsnull; nsIFrame* f = aItem->GetUnderlyingFrame(); NS_ASSERTION(f, "Can only call GetLeafLayerFor on items that have a frame"); Layer* layer = GetOldLayerFor(f, aItem->GetPerFrameKey()); if (!layer) return nsnull; if (layer->GetUserData() == &gThebesDisplayItemLayerUserData) { // This layer was created to render Thebes-rendered content for this // display item. The display item should not use it for its own // layer rendering. return nsnull; } // Clear clip rect; the caller is responsible for setting it. layer->SetClipRect(nsnull); return layer; } /* static */ void FrameLayerBuilder::InvalidateThebesLayerContents(nsIFrame* aFrame, const nsRect& aRect) { nsRegion* invalidThebesContent = static_cast (aFrame->Properties().Get(ThebesLayerInvalidRegionProperty())); if (!invalidThebesContent) return; invalidThebesContent->Or(*invalidThebesContent, aRect); invalidThebesContent->SimplifyOutward(20); } /** * Returns true if we find a descendant with a container layer */ static PRBool InternalInvalidateThebesLayersInSubtree(nsIFrame* aFrame) { if (!(aFrame->GetStateBits() & NS_FRAME_HAS_CONTAINER_LAYER_DESCENDANT)) return PR_FALSE; PRBool foundContainerLayer = PR_FALSE; if (aFrame->GetStateBits() & NS_FRAME_HAS_CONTAINER_LAYER) { // Delete the invalid region to indicate that all Thebes contents // need to be invalidated aFrame->Properties().Delete(ThebesLayerInvalidRegionProperty()); foundContainerLayer = PR_TRUE; } PRInt32 listIndex = 0; nsIAtom* childList = nsnull; do { nsIFrame* child = aFrame->GetFirstChild(childList); if (!child && !childList) { nsSubDocumentFrame* subdocumentFrame = do_QueryFrame(aFrame); if (subdocumentFrame) { // Descend into the subdocument child = subdocumentFrame->GetSubdocumentRootFrame(); } } while (child) { if (InternalInvalidateThebesLayersInSubtree(child)) { foundContainerLayer = PR_TRUE; } child = child->GetNextSibling(); } childList = aFrame->GetAdditionalChildListName(listIndex++); } while (childList); if (!foundContainerLayer) { aFrame->RemoveStateBits(NS_FRAME_HAS_CONTAINER_LAYER_DESCENDANT); } return foundContainerLayer; } /* static */ void FrameLayerBuilder::InvalidateThebesLayersInSubtree(nsIFrame* aFrame) { InternalInvalidateThebesLayersInSubtree(aFrame); } /* static */ void FrameLayerBuilder::InvalidateAllThebesLayerContents(LayerManager* aManager) { LayerManagerData* data = static_cast (aManager->GetUserData()); if (data) { data->mInvalidateAllThebesContent = PR_TRUE; } } /* static */ void FrameLayerBuilder::InvalidateAllLayers(LayerManager* aManager) { LayerManagerData* data = static_cast (aManager->GetUserData()); if (data) { data->mInvalidateAllLayers = PR_TRUE; } } /* static */ PRBool FrameLayerBuilder::HasDedicatedLayer(nsIFrame* aFrame, PRUint32 aDisplayItemKey) { void* propValue = aFrame->Properties().Get(DisplayItemDataProperty()); if (!propValue) return PR_FALSE; nsTArray* array = (reinterpret_cast*>(&propValue)); for (PRUint32 i = 0; i < array->Length(); ++i) { if (array->ElementAt(i).mDisplayItemKey == aDisplayItemKey) { void* layerUserData = array->ElementAt(i).mLayer->GetUserData(); if (layerUserData != &gColorLayerUserData && layerUserData != &gThebesDisplayItemLayerUserData) return PR_TRUE; } } return PR_FALSE; } /* static */ void FrameLayerBuilder::DrawThebesLayer(ThebesLayer* aLayer, gfxContext* aContext, const nsIntRegion& aRegionToDraw, const nsIntRegion& aRegionToInvalidate, void* aCallbackData) { nsDisplayListBuilder* builder = static_cast (aCallbackData); nsTArray items; nsIFrame* containerLayerFrame; { ThebesLayerItemsEntry* entry = builder->LayerBuilder()->mThebesLayerItems.GetEntry(aLayer); NS_ASSERTION(entry, "We shouldn't be drawing into a layer with no items!"); items.SwapElements(entry->mItems); containerLayerFrame = entry->mContainerLayerFrame; // Later after this point, due to calls to DidEndTransaction // for temporary layer managers, mThebesLayerItems can change, // so 'entry' could become invalid. } gfxMatrix transform; if (!aLayer->GetTransform().Is2D(&transform)) { NS_ERROR("non-2D transform in our Thebes layer!"); return; } NS_ASSERTION(!transform.HasNonIntegerTranslation(), "Matrix not just an integer translation?"); // make the origin of the context coincide with the origin of the // ThebesLayer gfxContextMatrixAutoSaveRestore saveMatrix(aContext); aContext->Translate(-gfxPoint(transform.x0, transform.y0)); nsIntPoint offset(PRInt32(transform.x0), PRInt32(transform.y0)); nsPresContext* presContext = containerLayerFrame->PresContext(); nscoord appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel(); nsRect r = (aRegionToInvalidate.GetBounds() + offset). ToAppUnits(appUnitsPerDevPixel); containerLayerFrame->InvalidateWithFlags(r, nsIFrame::INVALIDATE_NO_THEBES_LAYERS | nsIFrame::INVALIDATE_EXCLUDE_CURRENT_PAINT); PRUint32 i; // Update visible regions. We need perform visibility analysis again // because we may be asked to draw into part of a ThebesLayer that // isn't actually visible in the window (e.g., because a ThebesLayer // expanded its visible region to a rectangle internally), in which // case the mVisibleRect stored in the display item may be wrong. nsRegion visible = aRegionToDraw.ToAppUnits(appUnitsPerDevPixel); visible.MoveBy(NSIntPixelsToAppUnits(offset.x, appUnitsPerDevPixel), NSIntPixelsToAppUnits(offset.y, appUnitsPerDevPixel)); for (i = items.Length(); i > 0; --i) { ClippedDisplayItem* cdi = &items[i - 1]; NS_ASSERTION(AppUnitsPerDevPixel(cdi->mItem) == appUnitsPerDevPixel, "a thebes layer should contain items only at the same zoom"); if (!cdi->mHasClipRect || cdi->mClipRect.Contains(visible.GetBounds())) { cdi->mItem->RecomputeVisibility(builder, &visible); continue; } // Do a little dance to account for the fact that we're clipping // to cdi->mClipRect nsRegion clipped; clipped.And(visible, cdi->mClipRect); nsRegion finalClipped = clipped; cdi->mItem->RecomputeVisibility(builder, &finalClipped); nsRegion removed; removed.Sub(clipped, finalClipped); nsRegion newVisible; newVisible.Sub(visible, removed); // Don't let the visible region get too complex. if (newVisible.GetNumRects() <= 15) { visible = newVisible; } } nsRefPtr rc; nsresult rv = presContext->DeviceContext()->CreateRenderingContextInstance(*getter_AddRefs(rc)); if (NS_FAILED(rv)) return; rc->Init(presContext->DeviceContext(), aContext); nsRect currentClip; PRBool setClipRect = PR_FALSE; for (i = 0; i < items.Length(); ++i) { ClippedDisplayItem* cdi = &items[i]; if (cdi->mItem->GetVisibleRect().IsEmpty()) continue; // If the new desired clip state is different from the current state, // update the clip. if (setClipRect != cdi->mHasClipRect || (cdi->mHasClipRect && cdi->mClipRect != currentClip)) { if (setClipRect) { aContext->Restore(); } setClipRect = cdi->mHasClipRect; if (setClipRect) { currentClip = cdi->mClipRect; aContext->Save(); aContext->NewPath(); gfxRect clip(currentClip.x, currentClip.y, currentClip.width, currentClip.height); clip.ScaleInverse(presContext->AppUnitsPerDevPixel()); aContext->Rectangle(clip, PR_TRUE); aContext->Clip(); } } if (cdi->mTempLayerManager) { // This item has an inactive layer. Render it to the ThebesLayer // using the temporary BasicLayerManager. cdi->mTempLayerManager->BeginTransactionWithTarget(aContext); cdi->mTempLayerManager->EndTransaction(DrawThebesLayer, builder); } else { cdi->mItem->Paint(builder, rc); } } if (setClipRect) { aContext->Restore(); } } #ifdef DEBUG void FrameLayerBuilder::DumpRetainedLayerTree() { if (mRetainingManager) { mRetainingManager->Dump(stderr); } } #endif } // namespace mozilla