gecko-dev/gfx/layers/PersistentBufferProvider.cpp

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C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "PersistentBufferProvider.h"
#include "Layers.h"
#include "mozilla/layers/ShadowLayers.h"
#include "mozilla/layers/TextureClient.h"
#include "mozilla/gfx/Logging.h"
#include "pratom.h"
#include "gfxPlatform.h"
namespace mozilla {
using namespace gfx;
namespace layers {
PersistentBufferProviderBasic::PersistentBufferProviderBasic(DrawTarget* aDt)
: mDrawTarget(aDt)
{
MOZ_COUNT_CTOR(PersistentBufferProviderBasic);
}
PersistentBufferProviderBasic::~PersistentBufferProviderBasic()
{
MOZ_COUNT_DTOR(PersistentBufferProviderBasic);
Destroy();
}
already_AddRefed<gfx::DrawTarget>
PersistentBufferProviderBasic::BorrowDrawTarget(const gfx::IntRect& aPersistedRect)
{
MOZ_ASSERT(!mSnapshot);
RefPtr<gfx::DrawTarget> dt(mDrawTarget);
return dt.forget();
}
bool
PersistentBufferProviderBasic::ReturnDrawTarget(already_AddRefed<gfx::DrawTarget> aDT)
{
RefPtr<gfx::DrawTarget> dt(aDT);
MOZ_ASSERT(mDrawTarget == dt);
if (dt) {
// Since SkiaGL default to storing drawing command until flush
// we have to flush it before present.
dt->Flush();
}
return true;
}
already_AddRefed<gfx::SourceSurface>
PersistentBufferProviderBasic::BorrowSnapshot()
{
mSnapshot = mDrawTarget->Snapshot();
RefPtr<SourceSurface> snapshot = mSnapshot;
return snapshot.forget();
}
void
PersistentBufferProviderBasic::ReturnSnapshot(already_AddRefed<gfx::SourceSurface> aSnapshot)
{
RefPtr<SourceSurface> snapshot = aSnapshot;
MOZ_ASSERT(!snapshot || snapshot == mSnapshot);
mSnapshot = nullptr;
}
void
PersistentBufferProviderBasic::Destroy()
{
mSnapshot = nullptr;
mDrawTarget = nullptr;
}
//static
already_AddRefed<PersistentBufferProviderBasic>
PersistentBufferProviderBasic::Create(gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
gfx::BackendType aBackend)
{
RefPtr<DrawTarget> dt = gfxPlatform::GetPlatform()->CreateDrawTargetForBackend(aBackend, aSize, aFormat);
if (!dt) {
return nullptr;
}
RefPtr<PersistentBufferProviderBasic> provider =
new PersistentBufferProviderBasic(dt);
return provider.forget();
}
//static
already_AddRefed<PersistentBufferProviderShared>
PersistentBufferProviderShared::Create(gfx::IntSize aSize,
gfx::SurfaceFormat aFormat,
KnowsCompositor* aKnowsCompositor)
{
if (!aKnowsCompositor || !aKnowsCompositor->GetTextureForwarder()->IPCOpen()) {
return nullptr;
}
RefPtr<TextureClient> texture = TextureClient::CreateForDrawing(
aKnowsCompositor, aFormat, aSize,
BackendSelector::Canvas,
TextureFlags::DEFAULT | TextureFlags::NON_BLOCKING_READ_LOCK,
TextureAllocationFlags::ALLOC_DEFAULT
);
if (!texture) {
return nullptr;
}
RefPtr<PersistentBufferProviderShared> provider =
new PersistentBufferProviderShared(aSize, aFormat, aKnowsCompositor, texture);
return provider.forget();
}
PersistentBufferProviderShared::PersistentBufferProviderShared(gfx::IntSize aSize,
gfx::SurfaceFormat aFormat,
KnowsCompositor* aKnowsCompositor,
RefPtr<TextureClient>& aTexture)
: mSize(aSize)
, mFormat(aFormat)
, mKnowsCompositor(aKnowsCompositor)
, mFront(Nothing())
{
MOZ_ASSERT(aKnowsCompositor);
if (mTextures.append(aTexture)) {
mBack = Some<uint32_t>(0);
}
MOZ_COUNT_CTOR(PersistentBufferProviderShared);
}
PersistentBufferProviderShared::~PersistentBufferProviderShared()
{
MOZ_COUNT_DTOR(PersistentBufferProviderShared);
if (IsActivityTracked()) {
mKnowsCompositor->GetActiveResourceTracker()->RemoveObject(this);
}
Destroy();
}
LayersBackend
PersistentBufferProviderShared::GetType()
{
if (mKnowsCompositor->GetCompositorBackendType() == LayersBackend::LAYERS_WR) {
return LayersBackend::LAYERS_WR;
} else {
return LayersBackend::LAYERS_CLIENT;
}
}
bool
PersistentBufferProviderShared::SetKnowsCompositor(KnowsCompositor* aKnowsCompositor)
{
MOZ_ASSERT(aKnowsCompositor);
if (!aKnowsCompositor) {
return false;
}
if (mKnowsCompositor == aKnowsCompositor) {
// The forwarder should not change most of the time.
return true;
}
if (IsActivityTracked()) {
mKnowsCompositor->GetActiveResourceTracker()->RemoveObject(this);
}
if (mKnowsCompositor->GetTextureForwarder() != aKnowsCompositor->GetTextureForwarder() ||
mKnowsCompositor->GetCompositorBackendType() != aKnowsCompositor->GetCompositorBackendType()) {
// We are going to be used with an different and/or incompatible forwarder.
// This should be extremely rare. We have to copy the front buffer into a
// texture that is compatible with the new forwarder.
// Grab the current front buffer.
RefPtr<TextureClient> prevTexture = GetTexture(mFront);
// Get rid of everything else
Destroy();
if (prevTexture) {
RefPtr<TextureClient> newTexture = TextureClient::CreateForDrawing(
aKnowsCompositor, mFormat, mSize,
BackendSelector::Canvas,
TextureFlags::DEFAULT | TextureFlags::NON_BLOCKING_READ_LOCK,
TextureAllocationFlags::ALLOC_DEFAULT
);
MOZ_ASSERT(newTexture);
if (!newTexture) {
return false;
}
// If we early-return in one of the following branches, we will
// leave the buffer provider in an empty state, since we called
// Destroy. Not ideal but at least we won't try to use it with a
// an incompatible ipc channel.
if (!newTexture->Lock(OpenMode::OPEN_WRITE)) {
return false;
}
if (!prevTexture->Lock(OpenMode::OPEN_READ)) {
newTexture->Unlock();
return false;
}
bool success = prevTexture->CopyToTextureClient(newTexture, nullptr, nullptr);
prevTexture->Unlock();
newTexture->Unlock();
if (!success) {
return false;
}
if (!mTextures.append(newTexture)) {
return false;
}
mFront = Some<uint32_t>(mTextures.length() - 1);
mBack = mFront;
}
}
mKnowsCompositor = aKnowsCompositor;
return true;
}
TextureClient*
PersistentBufferProviderShared::GetTexture(const Maybe<uint32_t>& aIndex)
{
if (aIndex.isNothing() || !CheckIndex(aIndex.value())) {
return nullptr;
}
return mTextures[aIndex.value()];
}
already_AddRefed<gfx::DrawTarget>
PersistentBufferProviderShared::BorrowDrawTarget(const gfx::IntRect& aPersistedRect)
{
if (!mKnowsCompositor->GetTextureForwarder()->IPCOpen()) {
return nullptr;
}
MOZ_ASSERT(!mSnapshot);
if (IsActivityTracked()) {
mKnowsCompositor->GetActiveResourceTracker()->MarkUsed(this);
} else {
mKnowsCompositor->GetActiveResourceTracker()->AddObject(this);
}
if (mDrawTarget) {
RefPtr<gfx::DrawTarget> dt(mDrawTarget);
return dt.forget();
}
auto previousBackBuffer = mBack;
TextureClient* tex = GetTexture(mBack);
// First try to reuse the current back buffer. If we can do that it means
// we can skip copying its content to the new back buffer.
if (tex && tex->IsReadLocked()) {
// The back buffer is currently used by the compositor, we can't draw
// into it.
tex = nullptr;
}
if (!tex) {
// Try to grab an already allocated texture if any is available.
for (uint32_t i = 0; i < mTextures.length(); ++i) {
if (!mTextures[i]->IsReadLocked()) {
mBack = Some(i);
tex = mTextures[i];
break;
}
}
}
if (!tex) {
// We have to allocate a new texture.
if (mTextures.length() >= 4) {
// We should never need to buffer that many textures, something's wrong.
// In theory we throttle the main thread when the compositor can't keep up,
// so we shoud never get in a situation where we sent 4 textures to the
// compositor and the latter has not released any of them.
// In practice, though, the throttling mechanism appears to have some issues,
// especially when switching between layer managers (during tab-switch).
// To make sure we don't get too far ahead of the compositor, we send a
// sync ping to the compositor thread...
mKnowsCompositor->SyncWithCompositor();
// ...and try again.
for (uint32_t i = 0; i < mTextures.length(); ++i) {
if (!mTextures[i]->IsReadLocked()) {
gfxCriticalNote << "Managed to allocate after flush.";
mBack = Some(i);
tex = mTextures[i];
break;
}
}
if (!tex) {
gfxCriticalError() << "Unexpected BufferProvider over-production.";
// It would be pretty bad to keep piling textures up at this point so we
// call NotifyInactive to remove some of our textures.
NotifyInactive();
// Give up now. The caller can fall-back to a non-shared buffer provider.
return nullptr;
}
}
RefPtr<TextureClient> newTexture = TextureClient::CreateForDrawing(
mKnowsCompositor, mFormat, mSize,
BackendSelector::Canvas,
TextureFlags::DEFAULT | TextureFlags::NON_BLOCKING_READ_LOCK,
TextureAllocationFlags::ALLOC_DEFAULT
);
MOZ_ASSERT(newTexture);
if (newTexture) {
if (mTextures.append(newTexture)) {
tex = newTexture;
mBack = Some<uint32_t>(mTextures.length() - 1);
}
}
}
if (!tex || !tex->Lock(OpenMode::OPEN_READ_WRITE)) {
return nullptr;
}
if (mBack != previousBackBuffer && !aPersistedRect.IsEmpty()) {
TextureClient* previous = GetTexture(previousBackBuffer);
if (previous && previous->Lock(OpenMode::OPEN_READ)) {
DebugOnly<bool> success = previous->CopyToTextureClient(tex, &aPersistedRect, nullptr);
MOZ_ASSERT(success);
previous->Unlock();
}
}
mDrawTarget = tex->BorrowDrawTarget();
RefPtr<gfx::DrawTarget> dt(mDrawTarget);
return dt.forget();
}
bool
PersistentBufferProviderShared::ReturnDrawTarget(already_AddRefed<gfx::DrawTarget> aDT)
{
RefPtr<gfx::DrawTarget> dt(aDT);
MOZ_ASSERT(mDrawTarget == dt);
// Can't change the current front buffer while its snapshot is borrowed!
MOZ_ASSERT(!mSnapshot);
mDrawTarget = nullptr;
dt = nullptr;
TextureClient* back = GetTexture(mBack);
MOZ_ASSERT(back);
if (back) {
back->Unlock();
mFront = mBack;
}
return !!back;
}
TextureClient*
PersistentBufferProviderShared::GetTextureClient()
{
// Can't access the front buffer while drawing.
MOZ_ASSERT(!mDrawTarget);
TextureClient* texture = GetTexture(mFront);
if (!texture) {
gfxCriticalNote << "PersistentBufferProviderShared: front buffer unavailable";
}
return texture;
}
already_AddRefed<gfx::SourceSurface>
PersistentBufferProviderShared::BorrowSnapshot()
{
MOZ_ASSERT(!mDrawTarget);
auto front = GetTexture(mFront);
if (!front || front->IsLocked()) {
MOZ_ASSERT(false);
return nullptr;
}
if (!front->Lock(OpenMode::OPEN_READ)) {
return nullptr;
}
RefPtr<DrawTarget> dt = front->BorrowDrawTarget();
if (!dt) {
front->Unlock();
return nullptr;
}
mSnapshot = dt->Snapshot();
RefPtr<SourceSurface> snapshot = mSnapshot;
return snapshot.forget();
}
void
PersistentBufferProviderShared::ReturnSnapshot(already_AddRefed<gfx::SourceSurface> aSnapshot)
{
RefPtr<SourceSurface> snapshot = aSnapshot;
MOZ_ASSERT(!snapshot || snapshot == mSnapshot);
mSnapshot = nullptr;
snapshot = nullptr;
auto front = GetTexture(mFront);
if (front) {
front->Unlock();
}
}
void
PersistentBufferProviderShared::NotifyInactive()
{
ClearCachedResources();
}
void
PersistentBufferProviderShared::ClearCachedResources()
{
RefPtr<TextureClient> front = GetTexture(mFront);
RefPtr<TextureClient> back = GetTexture(mBack);
// Clear all textures (except the front and back ones that we just kept).
mTextures.clear();
if (back) {
if (mTextures.append(back)) {
mBack = Some<uint32_t>(0);
}
if (front == back) {
mFront = mBack;
}
}
if (front && front != back) {
if (mTextures.append(front)) {
mFront = Some<uint32_t>(mTextures.length() - 1);
}
}
}
void
PersistentBufferProviderShared::Destroy()
{
mSnapshot = nullptr;
mDrawTarget = nullptr;
for (auto& mTexture : mTextures) {
TextureClient* texture = mTexture;
if (texture && texture->IsLocked()) {
MOZ_ASSERT(false);
texture->Unlock();
}
}
mTextures.clear();
}
} // namespace layers
} // namespace mozilla