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gecko-dev/layout/base/FrameLayerBuilder.cpp

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/* -*- 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 <robert@ocallahan.org>
*
* 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"
#include "nsCSSRendering.h"
#include "nsCSSFrameConstructor.h"
#ifdef DEBUG
#include <stdio.h>
#endif
using namespace mozilla::layers;
namespace mozilla {
namespace {
/**
* This is the userdata we associate with a layer manager.
*/
class LayerManagerData : public LayerUserData {
public:
LayerManagerData() :
mInvalidateAllThebesContent(PR_FALSE),
mInvalidateAllLayers(PR_FALSE)
{
MOZ_COUNT_CTOR(LayerManagerData);
mFramesWithLayers.Init();
}
~LayerManagerData() {
// Remove display item data properties now, since we won't be able
// to find these frames again without mFramesWithLayers.
mFramesWithLayers.EnumerateEntries(
FrameLayerBuilder::RemoveDisplayItemDataForFrame, nsnull);
MOZ_COUNT_DTOR(LayerManagerData);
}
/**
* Tracks which frames have layers associated with them.
*/
nsTHashtable<nsPtrHashKey<nsIFrame> > mFramesWithLayers;
PRPackedBool mInvalidateAllThebesContent;
PRPackedBool mInvalidateAllLayers;
};
static void DestroyRegion(void* aPropertyValue)
{
delete static_cast<nsRegion*>(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 FrameLayerBuilder::Clip& aClip);
/**
* 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),
mHasText(PR_FALSE), mHasTextOverTransparent(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(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect);
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;
/**
* True if there is any text visible in the layer.
*/
PRPackedBool mHasText;
/**
* True if there is any text visible in the layer that's over
* transparent pixels in the layer.
*/
PRPackedBool mHasTextOverTransparent;
};
/**
* 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<ThebesLayer> CreateOrRecycleThebesLayer(nsIFrame* aActiveScrolledRoot);
/**
* Grab the next recyclable ColorLayer, or create one if there are no
* more recyclable ColorLayers.
*/
already_AddRefed<ColorLayer> 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);
/**
* Try to determine whether the ThebesLayer at aThebesLayerIndex
* has an opaque single color covering the visible area behind it.
* If successful, return that color, otherwise return NS_RGBA(0,0,0,0).
*/
nscolor FindOpaqueBackgroundColorFor(PRInt32 aThebesLayerIndex);
/**
* 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<ThebesLayer> FindThebesLayerFor(nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect,
nsIFrame* aActiveScrolledRoot);
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<nsAutoPtr<ThebesLayerData>,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<nsRefPtr<Layer>,1> mNewChildLayers;
nsTArray<nsRefPtr<ThebesLayer> > mRecycledThebesLayers;
nsTArray<nsRefPtr<ColorLayer> > mRecycledColorLayers;
PRUint32 mNextFreeRecycledThebesLayer;
PRUint32 mNextFreeRecycledColorLayer;
PRPackedBool mInvalidateAllThebesContent;
};
class ThebesDisplayItemLayerUserData : public LayerUserData
{
public:
ThebesDisplayItemLayerUserData() :
mForcedBackgroundColor(NS_RGBA(0,0,0,0)) {}
nscolor mForcedBackgroundColor;
};
/**
* The address of gThebesDisplayItemLayerUserData is used as the user
* data key 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.
* The user data is a ThebesDisplayItemLayerUserData.
*/
PRUint8 gThebesDisplayItemLayerUserData;
/**
* The address of gColorLayerUserData is used as the user
* data key for ColorLayers created by FrameLayerBuilder.
* The user data is null.
*/
PRUint8 gColorLayerUserData;
/**
* The address of gLayerManagerUserData is used as the user
* data key for retained LayerManagers managed by FrameLayerBuilder.
* The user data is a LayerManagerData.
*/
PRUint8 gLayerManagerUserData;
} // anonymous namespace
void
FrameLayerBuilder::Init(nsDisplayListBuilder* aBuilder)
{
mRootPresContext = aBuilder->ReferenceFrame()->PresContext()->GetRootPresContext();
if (mRootPresContext) {
mInitialDOMGeneration = mRootPresContext->GetDOMGeneration();
}
}
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<LayerManager> managerRef;
nsTArray<DisplayItemData>* array =
reinterpret_cast<nsTArray<DisplayItemData>*>(&aPropertyValue);
NS_ASSERTION(!array->IsEmpty(), "Empty arrays should not be stored");
if (aRemoveFromFramesWithLayers) {
LayerManager* manager = array->ElementAt(0).mLayer->Manager();
LayerManagerData* data = static_cast<LayerManagerData*>
(manager->GetUserData(&gLayerManagerUserData));
NS_ASSERTION(data, "Frame with layer should have been recorded");
data->mFramesWithLayers.RemoveEntry(aFrame);
if (data->mFramesWithLayers.Count() == 0) {
manager->RemoveUserData(&gLayerManagerUserData);
// 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<DisplayItemData>();
}
/* static */ void
FrameLayerBuilder::DestroyDisplayItemData(nsIFrame* aFrame,
void* aPropertyValue)
{
InternalDestroyDisplayItemData(aFrame, aPropertyValue, PR_TRUE);
}
void
FrameLayerBuilder::WillBeginRetainedLayerTransaction(LayerManager* aManager)
{
mRetainingManager = aManager;
LayerManagerData* data = static_cast<LayerManagerData*>
(aManager->GetUserData(&gLayerManagerUserData));
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<LayerManagerData*>
(mRetainingManager->GetUserData(&gLayerManagerUserData));
if (data) {
// Update all the frames that used to have layers.
data->mFramesWithLayers.EnumerateEntries(UpdateDisplayItemDataForFrame, this);
} else {
data = new LayerManagerData();
mRetainingManager->SetUserData(&gLayerManagerUserData, 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<nsIFrame>* aEntry,
void* aUserArg)
{
FrameLayerBuilder* builder = static_cast<FrameLayerBuilder*>(aUserArg);
nsIFrame* f = aEntry->GetKey();
FrameProperties props = f->Properties();
DisplayItemDataEntry* newDisplayItems =
builder ? builder->mNewDisplayItemData.GetEntry(f) : nsnull;
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<nsRegion*>
(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<DisplayItemData>) == sizeof(void*));
nsTArray<DisplayItemData>* array =
reinterpret_cast<nsTArray<DisplayItemData>*>(&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<LayerManagerData*>(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<DisplayItemData>* array =
new (&propValue) nsTArray<DisplayItemData>();
// 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<DisplayItemData>* array =
(reinterpret_cast<nsTArray<DisplayItemData>*>(&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<ColorLayer>
ContainerState::CreateOrRecycleColorLayer()
{
nsRefPtr<ColorLayer> 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, nsnull);
}
return layer.forget();
}
already_AddRefed<ThebesLayer>
ContainerState::CreateOrRecycleThebesLayer(nsIFrame* aActiveScrolledRoot)
{
// We need a new thebes layer
nsRefPtr<ThebesLayer> 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,
new ThebesDisplayItemLayerUserData());
}
// 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 PRInt32
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<nsDisplayZoom*>(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");
}
}
nscolor
ContainerState::FindOpaqueBackgroundColorFor(PRInt32 aThebesLayerIndex)
{
ThebesLayerData* target = mThebesLayerDataStack[aThebesLayerIndex];
for (PRInt32 i = aThebesLayerIndex - 1; i >= 0; --i) {
ThebesLayerData* candidate = mThebesLayerDataStack[i];
nsIntRegion visibleAboveIntersection;
visibleAboveIntersection.And(candidate->mVisibleAboveRegion, target->mVisibleRegion);
if (!visibleAboveIntersection.IsEmpty()) {
// Some non-Thebes content between target and candidate; this is
// hopeless
break;
}
nsIntRegion intersection;
intersection.And(candidate->mVisibleRegion, target->mVisibleRegion);
if (intersection.IsEmpty()) {
// The layer doesn't intersect our target, ignore it and move on
continue;
}
// The candidate intersects our target. If any layer has a solid-color
// area behind our target, this must be it. Scan its display items.
nsPresContext* presContext = mContainerFrame->PresContext();
nscoord appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
nsRect rect =
target->mVisibleRegion.GetBounds().ToAppUnits(appUnitsPerDevPixel);
return mBuilder->LayerBuilder()->
FindOpaqueColorCovering(mBuilder, candidate->mLayer, rect);
}
return NS_RGBA(0,0,0,0);
}
void
ContainerState::PopThebesLayerData()
{
NS_ASSERTION(!mThebesLayerDataStack.IsEmpty(), "Can't pop");
PRInt32 lastIndex = mThebesLayerDataStack.Length() - 1;
ThebesLayerData* data = mThebesLayerDataStack[lastIndex];
Layer* layer;
if (data->mIsSolidColorInVisibleRegion) {
nsRefPtr<ColorLayer> 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);
PRBool isOpaque = transparentRegion.IsEmpty();
// For translucent ThebesLayers, try to find an opaque background
// color that covers the entire area beneath it so we can pull that
// color into this layer to make it opaque.
if (layer == data->mLayer) {
nscolor backgroundColor = NS_RGBA(0,0,0,0);
if (!isOpaque) {
backgroundColor = FindOpaqueBackgroundColorFor(lastIndex);
if (NS_GET_A(backgroundColor) == 255) {
isOpaque = PR_TRUE;
}
}
// Store the background color
ThebesDisplayItemLayerUserData* userData =
static_cast<ThebesDisplayItemLayerUserData*>
(data->mLayer->GetUserData(&gThebesDisplayItemLayerUserData));
NS_ASSERTION(userData, "where did our user data go?");
if (userData->mForcedBackgroundColor != backgroundColor) {
// Invalidate the entire target ThebesLayer since we're changing
// the background color
data->mLayer->InvalidateRegion(data->mLayer->GetValidRegion());
}
userData->mForcedBackgroundColor = backgroundColor;
}
PRUint32 flags =
(isOpaque ? Layer::CONTENT_OPAQUE : 0) |
(data->mHasText ? 0 : Layer::CONTENT_NO_TEXT) |
(data->mHasTextOverTransparent ? 0 : Layer::CONTENT_NO_TEXT_OVER_TRANSPARENT);
layer->SetContentFlags(flags);
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);
}
mThebesLayerDataStack.RemoveElementAt(lastIndex);
}
static PRBool
IsText(nsDisplayItem* aItem) {
switch (aItem->GetType()) {
case nsDisplayItem::TYPE_TEXT:
case nsDisplayItem::TYPE_BULLET:
case nsDisplayItem::TYPE_HEADER_FOOTER:
#ifdef MOZ_MATHML
case nsDisplayItem::TYPE_MATHML_CHAR_FOREGROUND:
#endif
#ifdef MOZ_XUL
case nsDisplayItem::TYPE_XUL_TEXT_BOX:
#endif
return PR_TRUE;
default:
return PR_FALSE;
}
}
void
ContainerState::ThebesLayerData::Accumulate(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect)
{
nscolor uniformColor;
if (aItem->IsUniform(aBuilder, &uniformColor)) {
if (mVisibleRegion.IsEmpty()) {
// This color is all we have
mSolidColor = uniformColor;
mIsSolidColorInVisibleRegion = PR_TRUE;
} else if (mIsSolidColorInVisibleRegion &&
mVisibleRegion.IsEqual(nsIntRegion(aVisibleRect))) {
// we can just blend the colors together
mSolidColor = NS_ComposeColors(mSolidColor, uniformColor);
} else {
mIsSolidColorInVisibleRegion = PR_FALSE;
}
} else {
mIsSolidColorInVisibleRegion = PR_FALSE;
}
mVisibleRegion.Or(mVisibleRegion, aVisibleRect);
mVisibleRegion.SimplifyOutward(4);
mDrawRegion.Or(mDrawRegion, aDrawRect);
mDrawRegion.SimplifyOutward(4);
if (aItem->IsOpaque(aBuilder)) {
// 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, aDrawRect);
if (tmp.GetNumRects() <= 4) {
mOpaqueRegion = tmp;
}
} else if (IsText(aItem)) {
mHasText = PR_TRUE;
if (!mOpaqueRegion.Contains(aVisibleRect)) {
mHasTextOverTransparent = PR_TRUE;
}
}
}
already_AddRefed<ThebesLayer>
ContainerState::FindThebesLayerFor(nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect,
nsIFrame* aActiveScrolledRoot)
{
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<ThebesLayer> 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(mBuilder, aItem, aVisibleRect, aDrawRect);
return layer.forget();
}
static already_AddRefed<BasicLayerManager>
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<BasicLayerManager> tempManager = new BasicLayerManager();
tempManager->BeginTransaction();
nsRefPtr<Layer> 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.)
* If we have to clip to a rounded rect, we treat any active layer as
* though it's inactive so that we draw it ourselves into the thebes layer.
* 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 FrameLayerBuilder::Clip& aClip)
{
PRInt32 appUnitsPerDevPixel =
mContainerFrame->PresContext()->AppUnitsPerDevPixel();
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
nsDisplayItem::Type type = item->GetType();
if (type == nsDisplayItem::TYPE_CLIP ||
type == nsDisplayItem::TYPE_CLIP_ROUNDED_RECT) {
FrameLayerBuilder::Clip childClip(aClip, item);
ProcessDisplayItems(*item->GetList(), childClip);
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 (aClip.mHaveClipRect) {
itemContent.IntersectRect(aClip.mClipRect, itemContent);
}
nsIntRect itemDrawRect = itemContent.ToNearestPixels(appUnitsPerDevPixel);
nsDisplayItem::LayerState layerState =
item->GetLayerState(mBuilder, mManager);
// Assign the item to a layer
if (layerState == LAYER_ACTIVE && aClip.mRoundedClipRects.IsEmpty()) {
// 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<Layer> 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->HasUserData(&gLayerManagerUserData),
"We shouldn't have a FrameLayerBuilder-managed layer here!");
// It has its own layer. Update that layer's clip and visible rects.
if (aClip.mHaveClipRect) {
ownLayer->IntersectClipRect(
aClip.mClipRect.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<BasicLayerManager> tempLayerManager;
if (layerState != LAYER_NONE) {
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());
}
nsRefPtr<ThebesLayer> thebesLayer =
FindThebesLayerFor(item, itemVisibleRect, itemDrawRect,
activeScrolledRoot);
InvalidateForLayerChange(item, thebesLayer);
mBuilder->LayerBuilder()->
AddThebesDisplayItem(thebesLayer, item, aClip, 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 Clip& aClip,
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, aClip));
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()));
}
}
nscolor
FrameLayerBuilder::FindOpaqueColorCovering(nsDisplayListBuilder* aBuilder,
ThebesLayer* aLayer,
const nsRect& aRect)
{
ThebesLayerItemsEntry* entry = mThebesLayerItems.GetEntry(aLayer);
NS_ASSERTION(entry, "Must know about this layer!");
for (PRInt32 i = entry->mItems.Length() - 1; i >= 0; --i) {
nsDisplayItem* item = entry->mItems[i].mItem;
const nsRect& visible = item->GetVisibleRect();
if (!visible.Intersects(aRect))
continue;
nscolor color;
if (visible.Contains(aRect) && item->IsUniform(aBuilder, &color) &&
NS_GET_A(color) == 255)
return color;
break;
}
return NS_RGBA(0,0,0,0);
}
void
ContainerState::CollectOldLayers()
{
for (Layer* layer = mContainerLayer->GetFirstChild(); layer;
layer = layer->GetNextSibling()) {
if (layer->HasUserData(&gColorLayerUserData)) {
mRecycledColorLayers.AppendElement(static_cast<ColorLayer*>(layer));
} else if (layer->HasUserData(&gThebesDisplayItemLayerUserData)) {
NS_ASSERTION(layer->AsThebesLayer(), "Wrong layer type");
mRecycledThebesLayers.AppendElement(static_cast<ThebesLayer*>(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<ContainerLayer>
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> containerLayer;
if (aManager == mRetainingManager) {
Layer* oldLayer = GetOldLayerFor(aContainerFrame, containerDisplayItemKey);
if (oldLayer) {
NS_ASSERTION(oldLayer->Manager() == aManager, "Wrong manager");
if (oldLayer->HasUserData(&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<ContainerLayer*>(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<nsRegion*>
(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);
}
Clip clip;
state.ProcessDisplayItems(aChildren, clip);
state.Finish();
PRUint32 flags = aChildren.IsOpaque() ? Layer::CONTENT_OPAQUE : 0;
containerLayer->SetContentFlags(flags);
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->HasUserData(&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<nsRegion*>
(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<LayerManagerData*>
(aManager->GetUserData(&gLayerManagerUserData));
if (data) {
data->mInvalidateAllThebesContent = PR_TRUE;
}
}
/* static */ void
FrameLayerBuilder::InvalidateAllLayers(LayerManager* aManager)
{
LayerManagerData* data = static_cast<LayerManagerData*>
(aManager->GetUserData(&gLayerManagerUserData));
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<DisplayItemData>* array =
(reinterpret_cast<nsTArray<DisplayItemData>*>(&propValue));
for (PRUint32 i = 0; i < array->Length(); ++i) {
if (array->ElementAt(i).mDisplayItemKey == aDisplayItemKey) {
Layer* layer = array->ElementAt(i).mLayer;
if (!layer->HasUserData(&gColorLayerUserData) &&
!layer->HasUserData(&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<nsDisplayListBuilder*>
(aCallbackData);
if (builder->LayerBuilder()->CheckDOMModified())
return;
nsTArray<ClippedDisplayItem> 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.
}
ThebesDisplayItemLayerUserData* userData =
static_cast<ThebesDisplayItemLayerUserData*>
(aLayer->GetUserData(&gThebesDisplayItemLayerUserData));
NS_ASSERTION(userData, "where did our user data go?");
if (NS_GET_A(userData->mForcedBackgroundColor) > 0) {
aContext->SetColor(gfxRGBA(userData->mForcedBackgroundColor));
aContext->Paint();
}
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();
PRInt32 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");
NS_ABORT_IF_FALSE(cdi->mClip.mHaveClipRect ||
cdi->mClip.mRoundedClipRects.IsEmpty(),
"If we have rounded rects, we must have a clip rect");
if (!cdi->mClip.mHaveClipRect ||
(cdi->mClip.mRoundedClipRects.IsEmpty() &&
cdi->mClip.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->mClip.mClipRect);
nsRegion finalClipped = clipped;
cdi->mItem->RecomputeVisibility(builder, &finalClipped);
// If we have rounded clip rects, don't subtract from the visible
// region since we aren't displaying everything inside the rect.
if (cdi->mClip.mRoundedClipRects.IsEmpty()) {
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<nsIRenderingContext> rc;
nsresult rv =
presContext->DeviceContext()->CreateRenderingContextInstance(*getter_AddRefs(rc));
if (NS_FAILED(rv))
return;
rc->Init(presContext->DeviceContext(), aContext);
Clip 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->mClip.mHaveClipRect ||
(cdi->mClip.mHaveClipRect && cdi->mClip != currentClip)) {
if (setClipRect) {
aContext->Restore();
}
setClipRect = cdi->mClip.mHaveClipRect;
if (setClipRect) {
currentClip = cdi->mClip;
aContext->Save();
currentClip.ApplyTo(aContext, presContext);
}
}
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 (builder->LayerBuilder()->CheckDOMModified())
break;
}
if (setClipRect) {
aContext->Restore();
}
}
PRBool
FrameLayerBuilder::CheckDOMModified()
{
if (!mRootPresContext ||
mInitialDOMGeneration == mRootPresContext->GetDOMGeneration())
return PR_FALSE;
if (mDetectedDOMModification) {
// Don't spam the console with extra warnings
return PR_TRUE;
}
mDetectedDOMModification = PR_TRUE;
// Painting is not going to complete properly. There's not much
// we can do here though. Invalidating the window to get another repaint
// is likely to lead to an infinite repaint loop.
NS_WARNING("Detected DOM modification during paint, bailing out!");
return PR_TRUE;
}
#ifdef DEBUG
void
FrameLayerBuilder::DumpRetainedLayerTree()
{
if (mRetainingManager) {
mRetainingManager->Dump(stderr);
}
}
#endif
FrameLayerBuilder::Clip::Clip(const Clip& aOther, nsDisplayItem* aClipItem)
: mRoundedClipRects(aOther.mRoundedClipRects),
mHaveClipRect(PR_TRUE)
{
nsDisplayItem::Type type = aClipItem->GetType();
NS_ABORT_IF_FALSE(type == nsDisplayItem::TYPE_CLIP ||
type == nsDisplayItem::TYPE_CLIP_ROUNDED_RECT,
"unexpected display item type");
nsDisplayClip* item = static_cast<nsDisplayClip*>(aClipItem);
// Always intersect with mClipRect, even if we're going to add a
// rounded rect.
if (aOther.mHaveClipRect) {
mClipRect.IntersectRect(aOther.mClipRect, item->GetClipRect());
} else {
mClipRect = item->GetClipRect();
}
if (type == nsDisplayItem::TYPE_CLIP_ROUNDED_RECT) {
RoundedRect *rr = mRoundedClipRects.AppendElement();
if (rr) {
rr->mRect = item->GetClipRect();
static_cast<nsDisplayClipRoundedRect*>(item)->GetRadii(rr->mRadii);
}
}
// FIXME: Optimize away excess rounded rectangles due to the new addition.
}
void
FrameLayerBuilder::Clip::ApplyTo(gfxContext* aContext,
nsPresContext* aPresContext)
{
aContext->NewPath();
PRInt32 A2D = aPresContext->AppUnitsPerDevPixel();
gfxRect clip = nsLayoutUtils::RectToGfxRect(mClipRect, A2D);
aContext->Rectangle(clip, PR_TRUE);
aContext->Clip();
for (PRUint32 i = 0, iEnd = mRoundedClipRects.Length();
i < iEnd; ++i) {
const Clip::RoundedRect &rr = mRoundedClipRects[i];
gfxCornerSizes pixelRadii;
nsCSSRendering::ComputePixelRadii(rr.mRadii, A2D, &pixelRadii);
clip = nsLayoutUtils::RectToGfxRect(rr.mRect, A2D);
clip.Round();
clip.Condition();
// REVIEW: This might make clip empty. Is that OK?
aContext->NewPath();
aContext->RoundedRectangle(clip, pixelRadii);
aContext->Clip();
}
}
} // namespace mozilla
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