/usr/include/thunderbird/mozilla/layers/AsyncCompositionManager.h is in thunderbird-dev 1:52.8.0-1~deb8u1.
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* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_ASYNCCOMPOSITIONMANAGER_H
#define GFX_ASYNCCOMPOSITIONMANAGER_H
#include "Units.h" // for ScreenPoint, etc
#include "mozilla/layers/LayerManagerComposite.h" // for LayerManagerComposite
#include "mozilla/Attributes.h" // for final, etc
#include "mozilla/RefPtr.h" // for RefCounted
#include "mozilla/TimeStamp.h" // for TimeStamp
#include "mozilla/dom/ScreenOrientation.h" // for ScreenOrientation
#include "mozilla/gfx/BasePoint.h" // for BasePoint
#include "mozilla/gfx/Matrix.h" // for Matrix4x4
#include "mozilla/layers/FrameUniformityData.h" // For FrameUniformityData
#include "mozilla/layers/LayersMessages.h" // for TargetConfig
#include "mozilla/RefPtr.h" // for nsRefPtr
#include "nsISupportsImpl.h" // for LayerManager::AddRef, etc
namespace mozilla {
namespace layers {
class AsyncPanZoomController;
class Layer;
class LayerManagerComposite;
class AutoResolveRefLayers;
class CompositorBridgeParent;
// Represents async transforms consisting of a scale and a translation.
struct AsyncTransform {
explicit AsyncTransform(LayerToParentLayerScale aScale = LayerToParentLayerScale(),
ParentLayerPoint aTranslation = ParentLayerPoint())
: mScale(aScale)
, mTranslation(aTranslation)
{}
operator AsyncTransformComponentMatrix() const
{
return AsyncTransformComponentMatrix::Scaling(mScale.scale, mScale.scale, 1)
.PostTranslate(mTranslation.x, mTranslation.y, 0);
}
bool operator==(const AsyncTransform& rhs) const {
return mTranslation == rhs.mTranslation && mScale == rhs.mScale;
}
bool operator!=(const AsyncTransform& rhs) const {
return !(*this == rhs);
}
LayerToParentLayerScale mScale;
ParentLayerPoint mTranslation;
};
/**
* Manage async composition effects. This class is only used with OMTC and only
* lives on the compositor thread. It is a layer on top of the layer manager
* (LayerManagerComposite) which deals with elements of composition which are
* usually dealt with by dom or layout when main thread rendering, but which can
* short circuit that stuff to directly affect layers as they are composited,
* for example, off-main thread animation, async video, async pan/zoom.
*/
class AsyncCompositionManager final
{
friend class AutoResolveRefLayers;
~AsyncCompositionManager();
public:
NS_INLINE_DECL_REFCOUNTING(AsyncCompositionManager)
explicit AsyncCompositionManager(LayerManagerComposite* aManager);
/**
* This forces the is-first-paint flag to true. This is intended to
* be called by the widget code when it loses its viewport information
* (or for whatever reason wants to refresh the viewport information).
* The information refresh happens because the compositor will call
* SetFirstPaintViewport on the next frame of composition.
*/
void ForceIsFirstPaint() { mIsFirstPaint = true; }
// Sample transforms for layer trees. Return true to request
// another animation frame.
enum class TransformsToSkip : uint8_t { NoneOfThem = 0, APZ = 1 };
bool TransformShadowTree(TimeStamp aCurrentFrame,
TimeDuration aVsyncRate,
TransformsToSkip aSkip = TransformsToSkip::NoneOfThem);
// Calculates the correct rotation and applies the transform to
// our layer manager
void ComputeRotation();
// Call after updating our layer tree.
void Updated(bool isFirstPaint, const TargetConfig& aTargetConfig,
int32_t aPaintSyncId)
{
mIsFirstPaint |= isFirstPaint;
mLayersUpdated = true;
mTargetConfig = aTargetConfig;
if (aPaintSyncId) {
mPaintSyncId = aPaintSyncId;
}
}
bool RequiresReorientation(mozilla::dom::ScreenOrientationInternal aOrientation) const
{
return mTargetConfig.orientation() != aOrientation;
}
// True if the underlying layer tree is ready to be composited.
bool ReadyForCompose() { return mReadyForCompose; }
// Returns true if the next composition will be the first for a
// particular document.
bool IsFirstPaint() { return mIsFirstPaint; }
// GetFrameUniformity will return the frame uniformity for each layer attached to an APZ
// from the recorded data in RecordShadowTransform
void GetFrameUniformity(FrameUniformityData* aFrameUniformityData);
// Stores the clip rect of a layer in two parts: a fixed part and a scrolled
// part. When a layer is fixed, the clip needs to be adjusted to account for
// async transforms. Only the fixed part needs to be adjusted, so we need
// to store the two parts separately.
struct ClipParts {
Maybe<ParentLayerIntRect> mFixedClip;
Maybe<ParentLayerIntRect> mScrolledClip;
Maybe<ParentLayerIntRect> Intersect() const {
return IntersectMaybeRects(mFixedClip, mScrolledClip);
}
};
typedef std::map<Layer*, ClipParts> ClipPartsCache;
private:
// Return true if an AsyncPanZoomController content transform was
// applied for |aLayer|. |*aOutFoundRoot| is set to true on Android only, if
// one of the metrics on one of the layers was determined to be the "root"
// and its state was synced to the Java front-end. |aOutFoundRoot| must be
// non-null.
bool ApplyAsyncContentTransformToTree(Layer* aLayer,
bool* aOutFoundRoot);
/**
* Update the shadow transform for aLayer assuming that is a scrollbar,
* so that it stays in sync with the content that is being scrolled by APZ.
*/
void ApplyAsyncTransformToScrollbar(Layer* aLayer);
void SetFirstPaintViewport(const LayerIntPoint& aOffset,
const CSSToLayerScale& aZoom,
const CSSRect& aCssPageRect);
void SyncFrameMetrics(const ParentLayerPoint& aScrollOffset,
const CSSToParentLayerScale& aZoom,
const CSSRect& aCssPageRect,
const CSSRect& aDisplayPort,
const CSSToLayerScale& aPaintedResolution,
bool aLayersUpdated,
int32_t aPaintSyncId,
ScreenMargin& aFixedLayerMargins);
/**
* Adds a translation to the transform of any fixed position (whose parent
* layer is not fixed) or sticky position layer descendant of
* |aTransformedSubtreeRoot|. The translation is chosen so that the layer's
* anchor point relative to |aTransformedSubtreeRoot|'s parent layer is the same
* as it was when |aTransformedSubtreeRoot|'s GetLocalTransform() was
* |aPreviousTransformForRoot|. |aCurrentTransformForRoot| is
* |aTransformedSubtreeRoot|'s current GetLocalTransform() modulo any
* overscroll-related transform, which we don't want to adjust for.
* For sticky position layers, the translation is further intersected with
* the layer's sticky scroll ranges.
* This function will also adjust layers so that the given content document
* fixed position margins will be respected during asynchronous panning and
* zooming.
* |aTransformScrollId| is the scroll id of the scroll frame that scrolls
* |aTransformedSubtreeRoot|.
* |aClipPartsCache| optionally maps layers to separate fixed and scrolled
* clips, so we can only adjust the fixed portion.
* This function has a recursive implementation; aStartTraversalAt specifies
* where to start the current recursion of the traversal. For the initial
* call, it should be the same as aTrasnformedSubtreeRoot.
*/
void AlignFixedAndStickyLayers(Layer* aTransformedSubtreeRoot,
Layer* aStartTraversalAt,
FrameMetrics::ViewID aTransformScrollId,
const LayerToParentLayerMatrix4x4& aPreviousTransformForRoot,
const LayerToParentLayerMatrix4x4& aCurrentTransformForRoot,
const ScreenMargin& aFixedLayerMargins,
ClipPartsCache* aClipPartsCache);
/**
* DRAWING PHASE ONLY
*
* For reach RefLayer in our layer tree, look up its referent and connect it
* to the layer tree, if found.
* aHasRemoteContent - indicates if the layer tree contains a remote reflayer.
* May be null.
* aResolvePlugins - incoming value indicates if plugin windows should be
* updated through a call on aCompositor's UpdatePluginWindowState. Applies
* to linux and windows only, may be null. On return value indicates
* if any updates occured.
*/
void ResolveRefLayers(CompositorBridgeParent* aCompositor, bool* aHasRemoteContent,
bool* aResolvePlugins);
/**
* Detaches all referents resolved by ResolveRefLayers.
* Assumes that mLayerManager->GetRoot() and mTargetConfig have not changed
* since ResolveRefLayers was called.
*/
void DetachRefLayers();
// Records the shadow transforms for the tree of layers rooted at the given layer
void RecordShadowTransforms(Layer* aLayer);
TargetConfig mTargetConfig;
CSSRect mContentRect;
RefPtr<LayerManagerComposite> mLayerManager;
// When this flag is set, the next composition will be the first for a
// particular document (i.e. the document displayed on the screen will change).
// This happens when loading a new page or switching tabs. We notify the
// front-end (e.g. Java on Android) about this so that it take the new page
// size and zoom into account when providing us with the next view transform.
bool mIsFirstPaint;
// This flag is set during a layers update, so that the first composition
// after a layers update has it set. It is cleared after that first composition.
bool mLayersUpdated;
int32_t mPaintSyncId;
bool mReadyForCompose;
gfx::Matrix mWorldTransform;
LayerTransformRecorder mLayerTransformRecorder;
TimeStamp mPreviousFrameTimeStamp;
#ifdef MOZ_WIDGET_ANDROID
// The following two fields are only needed on Fennec with C++ APZ, because
// then we need to reposition the gecko scrollbar to deal with the
// dynamic toolbar shifting content around.
FrameMetrics::ViewID mRootScrollableId;
ScreenMargin mFixedLayerMargins;
#endif
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(AsyncCompositionManager::TransformsToSkip)
class MOZ_STACK_CLASS AutoResolveRefLayers {
public:
explicit AutoResolveRefLayers(AsyncCompositionManager* aManager,
CompositorBridgeParent* aCompositor = nullptr,
bool* aHasRemoteContent = nullptr,
bool* aResolvePlugins = nullptr) :
mManager(aManager)
{
if (mManager) {
mManager->ResolveRefLayers(aCompositor, aHasRemoteContent, aResolvePlugins);
}
}
~AutoResolveRefLayers()
{
if (mManager) {
mManager->DetachRefLayers();
}
}
private:
AsyncCompositionManager* mManager;
AutoResolveRefLayers(const AutoResolveRefLayers&) = delete;
AutoResolveRefLayers& operator=(const AutoResolveRefLayers&) = delete;
};
} // namespace layers
} // namespace mozilla
#endif
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