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gecko/gfx/layers/composite/ContainerLayerComposite.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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/. */
#include "ContainerLayerComposite.h"
#include <algorithm> // for min
#include "FrameMetrics.h" // for FrameMetrics
#include "Units.h" // for LayerRect, LayerPixel, etc
#include "gfx2DGlue.h" // for ToMatrix4x4
#include "gfx3DMatrix.h" // for gfx3DMatrix
#include "gfxImageSurface.h" // for gfxImageSurface
#include "gfxMatrix.h" // for gfxMatrix
#include "gfxPlatform.h" // for gfxPlatform
#include "gfxUtils.h" // for gfxUtils, etc
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/RefPtr.h" // for RefPtr
#include "mozilla/gfx/BaseRect.h" // for BaseRect
#include "mozilla/gfx/Matrix.h" // for Matrix4x4
#include "mozilla/gfx/Point.h" // for Point, IntPoint
#include "mozilla/gfx/Rect.h" // for IntRect, Rect
#include "mozilla/layers/Compositor.h" // for Compositor, etc
#include "mozilla/layers/CompositorTypes.h" // for DIAGNOSTIC_CONTAINER
#include "mozilla/layers/Effects.h" // for Effect, EffectChain, etc
#include "mozilla/layers/TextureHost.h" // for CompositingRenderTarget
#include "mozilla/mozalloc.h" // for operator delete, etc
#include "nsAutoPtr.h" // for nsRefPtr
#include "nsDebug.h" // for NS_ASSERTION
#include "nsISupportsUtils.h" // for NS_ADDREF, NS_RELEASE
#include "nsPoint.h" // for nsIntPoint
#include "nsRect.h" // for nsIntRect
#include "nsRegion.h" // for nsIntRegion
#include "nsTArray.h" // for nsAutoTArray
#include "nsTraceRefcnt.h" // for MOZ_COUNT_CTOR, etc
namespace mozilla {
namespace layers {
// HasOpaqueAncestorLayer and ContainerRender are shared between RefLayer and ContainerLayer
static bool
HasOpaqueAncestorLayer(Layer* aLayer)
{
for (Layer* l = aLayer->GetParent(); l; l = l->GetParent()) {
if (l->GetContentFlags() & Layer::CONTENT_OPAQUE)
return true;
}
return false;
}
/**
* Returns a rectangle of content painted opaquely by aLayer. Very consertative;
* bails by returning an empty rect in any tricky situations.
*/
static nsIntRect
GetOpaqueRect(Layer* aLayer)
{
nsIntRect result;
// Just bail if there's anything difficult to handle.
if (!aLayer->GetEffectiveTransform().IsIdentity() ||
aLayer->GetEffectiveOpacity() != 1.0f ||
aLayer->GetMaskLayer()) {
return result;
}
if (aLayer->GetContentFlags() & Layer::CONTENT_OPAQUE) {
result = aLayer->GetEffectiveVisibleRegion().GetLargestRectangle();
} else {
// Drill down into RefLayers because that's what we particularly care about;
// layer construction for aLayer will not have known about the opaqueness
// of any RefLayer subtrees.
RefLayer* refLayer = aLayer->AsRefLayer();
if (refLayer && refLayer->GetFirstChild()) {
result = GetOpaqueRect(refLayer->GetFirstChild());
}
}
const nsIntRect* clipRect = aLayer->GetEffectiveClipRect();
if (clipRect) {
result.IntersectRect(result, *clipRect);
}
return result;
}
template<class ContainerT> void
ContainerRender(ContainerT* aContainer,
const nsIntPoint& aOffset,
LayerManagerComposite* aManager,
const nsIntRect& aClipRect)
{
/**
* Setup our temporary surface for rendering the contents of this container.
*/
RefPtr<CompositingRenderTarget> surface;
Compositor* compositor = aManager->GetCompositor();
RefPtr<CompositingRenderTarget> previousTarget = compositor->GetCurrentRenderTarget();
nsIntPoint childOffset(aOffset);
nsIntRect visibleRect = aContainer->GetEffectiveVisibleRegion().GetBounds();
aContainer->mSupportsComponentAlphaChildren = false;
float opacity = aContainer->GetEffectiveOpacity();
bool needsSurface = aContainer->UseIntermediateSurface();
if (needsSurface) {
SurfaceInitMode mode = INIT_MODE_CLEAR;
bool surfaceCopyNeeded = false;
gfx::IntRect surfaceRect = gfx::IntRect(visibleRect.x, visibleRect.y,
visibleRect.width, visibleRect.height);
// we're about to create a framebuffer backed by textures to use as an intermediate
// surface. What to do if its size (as given by framebufferRect) would exceed the
// maximum texture size supported by the GL? The present code chooses the compromise
// of just clamping the framebuffer's size to the max supported size.
// This gives us a lower resolution rendering of the intermediate surface (children layers).
// See bug 827170 for a discussion.
int32_t maxTextureSize = compositor->GetMaxTextureSize();
surfaceRect.width = std::min(maxTextureSize, surfaceRect.width);
surfaceRect.height = std::min(maxTextureSize, surfaceRect.height);
if (aContainer->GetEffectiveVisibleRegion().GetNumRects() == 1 &&
(aContainer->GetContentFlags() & Layer::CONTENT_OPAQUE))
{
// don't need a background, we're going to paint all opaque stuff
aContainer->mSupportsComponentAlphaChildren = true;
mode = INIT_MODE_NONE;
} else {
const gfx3DMatrix& transform3D = aContainer->GetEffectiveTransform();
gfxMatrix transform;
// If we have an opaque ancestor layer, then we can be sure that
// all the pixels we draw into are either opaque already or will be
// covered by something opaque. Otherwise copying up the background is
// not safe.
if (HasOpaqueAncestorLayer(aContainer) &&
transform3D.Is2D(&transform) && !transform.HasNonIntegerTranslation()) {
mode = gfxPlatform::ComponentAlphaEnabled() ?
INIT_MODE_COPY : INIT_MODE_CLEAR;
surfaceCopyNeeded = (mode == INIT_MODE_COPY);
surfaceRect.x += transform.x0;
surfaceRect.y += transform.y0;
aContainer->mSupportsComponentAlphaChildren
= gfxPlatform::ComponentAlphaEnabled();
}
}
surfaceRect -= gfx::IntPoint(aOffset.x, aOffset.y);
if (surfaceCopyNeeded) {
surface = compositor->CreateRenderTargetFromSource(surfaceRect, previousTarget);
} else {
surface = compositor->CreateRenderTarget(surfaceRect, mode);
}
if (!surface) {
return;
}
compositor->SetRenderTarget(surface);
childOffset.x = visibleRect.x;
childOffset.y = visibleRect.y;
} else {
surface = previousTarget;
aContainer->mSupportsComponentAlphaChildren = (aContainer->GetContentFlags() & Layer::CONTENT_OPAQUE) ||
(aContainer->GetParent() && aContainer->GetParent()->SupportsComponentAlphaChildren());
}
nsAutoTArray<Layer*, 12> children;
aContainer->SortChildrenBy3DZOrder(children);
/**
* Render this container's contents.
*/
for (uint32_t i = 0; i < children.Length(); i++) {
LayerComposite* layerToRender = static_cast<LayerComposite*>(children.ElementAt(i)->ImplData());
if (layerToRender->GetLayer()->GetEffectiveVisibleRegion().IsEmpty() &&
!layerToRender->GetLayer()->AsContainerLayer()) {
continue;
}
if (i + 1 < children.Length() &&
layerToRender->GetLayer()->GetEffectiveTransform().IsIdentity()) {
LayerComposite* nextLayer = static_cast<LayerComposite*>(children.ElementAt(i + 1)->ImplData());
nsIntRect nextLayerOpaqueRect;
if (nextLayer && nextLayer->GetLayer()) {
nextLayerOpaqueRect = GetOpaqueRect(nextLayer->GetLayer());
}
if (!nextLayerOpaqueRect.IsEmpty()) {
nsIntRegion visibleRegion;
visibleRegion.Sub(layerToRender->GetShadowVisibleRegion(), nextLayerOpaqueRect);
layerToRender->SetShadowVisibleRegion(visibleRegion);
if (visibleRegion.IsEmpty()) {
continue;
}
}
}
nsIntRect clipRect = layerToRender->GetLayer()->
CalculateScissorRect(aClipRect, &aManager->GetWorldTransform());
if (clipRect.IsEmpty()) {
continue;
}
if (layerToRender->HasLayerBeenComposited()) {
// Composer2D will compose this layer so skip GPU composition
// this time & reset composition flag for next composition phase
layerToRender->SetLayerComposited(false);
} else {
layerToRender->RenderLayer(childOffset, clipRect);
}
// invariant: our GL context should be current here, I don't think we can
// assert it though
}
if (needsSurface) {
// Unbind the current surface and rebind the previous one.
#ifdef MOZ_DUMP_PAINTING
if (gfxUtils::sDumpPainting) {
nsRefPtr<gfxImageSurface> surf = surface->Dump(aManager->GetCompositor());
WriteSnapshotToDumpFile(aContainer, surf);
}
#endif
compositor->SetRenderTarget(previousTarget);
EffectChain effectChain;
LayerManagerComposite::AutoAddMaskEffect autoMaskEffect(aContainer->GetMaskLayer(),
effectChain,
!aContainer->GetTransform().CanDraw2D());
effectChain.mPrimaryEffect = new EffectRenderTarget(surface);
gfx::Matrix4x4 transform;
ToMatrix4x4(aContainer->GetEffectiveTransform(), transform);
gfx::Rect rect(visibleRect.x, visibleRect.y, visibleRect.width, visibleRect.height);
gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
aManager->GetCompositor()->DrawQuad(rect, clipRect, effectChain, opacity,
transform, gfx::Point(aOffset.x, aOffset.y));
}
if (aContainer->GetFrameMetrics().IsScrollable()) {
gfx::Matrix4x4 transform;
ToMatrix4x4(aContainer->GetEffectiveTransform(), transform);
const FrameMetrics& frame = aContainer->GetFrameMetrics();
LayerRect layerBounds = ScreenRect(frame.mCompositionBounds) * ScreenToLayerScale(1.0);
gfx::Rect rect(layerBounds.x, layerBounds.y, layerBounds.width, layerBounds.height);
gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
aManager->GetCompositor()->DrawDiagnostics(DIAGNOSTIC_CONTAINER,
rect, clipRect,
transform, gfx::Point(aOffset.x, aOffset.y));
}
}
ContainerLayerComposite::ContainerLayerComposite(LayerManagerComposite *aManager)
: ContainerLayer(aManager, nullptr)
, LayerComposite(aManager)
{
MOZ_COUNT_CTOR(ContainerLayerComposite);
mImplData = static_cast<LayerComposite*>(this);
}
ContainerLayerComposite::~ContainerLayerComposite()
{
MOZ_COUNT_DTOR(ContainerLayerComposite);
// We don't Destroy() on destruction here because this destructor
// can be called after remote content has crashed, and it may not be
// safe to free the IPC resources of our children. Those resources
// are automatically cleaned up by IPDL-generated code.
//
// In the common case of normal shutdown, either
// LayerManagerComposite::Destroy(), a parent
// *ContainerLayerComposite::Destroy(), or Disconnect() will trigger
// cleanup of our resources.
while (mFirstChild) {
RemoveChild(mFirstChild);
}
}
void
ContainerLayerComposite::Destroy()
{
if (!mDestroyed) {
while (mFirstChild) {
static_cast<LayerComposite*>(GetFirstChild()->ImplData())->Destroy();
RemoveChild(mFirstChild);
}
mDestroyed = true;
}
}
LayerComposite*
ContainerLayerComposite::GetFirstChildComposite()
{
if (!mFirstChild) {
return nullptr;
}
return static_cast<LayerComposite*>(mFirstChild->ImplData());
}
void
ContainerLayerComposite::RenderLayer(const nsIntPoint& aOffset,
const nsIntRect& aClipRect)
{
ContainerRender(this, aOffset, mCompositeManager, aClipRect);
}
void
ContainerLayerComposite::CleanupResources()
{
for (Layer* l = GetFirstChild(); l; l = l->GetNextSibling()) {
LayerComposite* layerToCleanup = static_cast<LayerComposite*>(l->ImplData());
layerToCleanup->CleanupResources();
}
}
RefLayerComposite::RefLayerComposite(LayerManagerComposite* aManager)
: RefLayer(aManager, nullptr)
, LayerComposite(aManager)
{
mImplData = static_cast<LayerComposite*>(this);
}
RefLayerComposite::~RefLayerComposite()
{
Destroy();
}
void
RefLayerComposite::Destroy()
{
MOZ_ASSERT(!mFirstChild);
mDestroyed = true;
}
LayerComposite*
RefLayerComposite::GetFirstChildComposite()
{
if (!mFirstChild) {
return nullptr;
}
return static_cast<LayerComposite*>(mFirstChild->ImplData());
}
void
RefLayerComposite::RenderLayer(const nsIntPoint& aOffset,
const nsIntRect& aClipRect)
{
ContainerRender(this, aOffset, mCompositeManager, aClipRect);
}
void
RefLayerComposite::CleanupResources()
{
}
} /* layers */
} /* mozilla */
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