gecko-dev/gfx/ipc/CrossProcessPaint.cpp

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/* -*- 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 "CrossProcessPaint.h"
#include "mozilla/dom/ContentProcessManager.h"
#include "mozilla/dom/ImageBitmap.h"
#include "mozilla/dom/BrowserParent.h"
#include "mozilla/dom/PWindowGlobalParent.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/dom/WindowGlobalChild.h"
#include "mozilla/dom/WindowGlobalActorsBinding.h"
#include "mozilla/gfx/DrawEventRecorder.h"
#include "mozilla/gfx/InlineTranslator.h"
#include "mozilla/PresShell.h"
#include "gfxPlatform.h"
#include "nsContentUtils.h"
#include "nsGlobalWindowInner.h"
#include "nsIDocShell.h"
#include "nsPresContext.h"
#define ENABLE_PAINT_LOG 0
// #define ENABLE_PAINT_LOG 1
#if ENABLE_PAINT_LOG
# define PF_LOG(...) printf_stderr("PaintFragment: " __VA_ARGS__)
# define CPP_LOG(...) printf_stderr("CrossProcessPaint: " __VA_ARGS__)
#else
# define PF_LOG(...)
# define CPP_LOG(...)
#endif
namespace mozilla {
namespace gfx {
using namespace mozilla::ipc;
/// The minimum scale we allow tabs to be rasterized at.
static const float kMinPaintScale = 0.05f;
/* static */
PaintFragment PaintFragment::Record(nsIDocShell* aDocShell,
const Maybe<IntRect>& aRect, float aScale,
nscolor aBackgroundColor,
CrossProcessPaintFlags aFlags) {
if (!aDocShell) {
PF_LOG("Couldn't find DocShell.\n");
return PaintFragment{};
}
RefPtr<nsPresContext> presContext = aDocShell->GetPresContext();
if (!presContext) {
PF_LOG("Couldn't find PresContext.\n");
return PaintFragment{};
}
IntRect rect;
if (!aRect) {
nsCOMPtr<nsIWidget> widget =
nsContentUtils::WidgetForDocument(aDocShell->GetDocument());
// TODO: Apply some sort of clipping to visible bounds here (Bug 1562720)
LayoutDeviceIntRect boundsDevice = widget->GetBounds();
boundsDevice.MoveTo(0, 0);
nsRect boundsAu = LayoutDevicePixel::ToAppUnits(
boundsDevice, presContext->AppUnitsPerDevPixel());
rect = gfx::RoundedOut(CSSPixel::FromAppUnits(boundsAu).ToUnknownRect());
} else {
rect = *aRect;
}
if (rect.IsEmpty()) {
// TODO: Should we return an empty surface here?
PF_LOG("Empty rect to paint.\n");
return PaintFragment{};
}
IntSize surfaceSize = rect.Size();
surfaceSize.width *= aScale;
surfaceSize.height *= aScale;
CPP_LOG(
"Recording "
"[docshell=%p, "
"rect=(%d, %d) x (%d, %d), "
"scale=%f, "
"color=(%u, %u, %u, %u)]\n",
aDocShell, rect.x, rect.y, rect.width, rect.height, aScale,
NS_GET_R(aBackgroundColor), NS_GET_G(aBackgroundColor),
NS_GET_B(aBackgroundColor), NS_GET_A(aBackgroundColor));
// Check for invalid sizes
if (surfaceSize.width <= 0 || surfaceSize.height <= 0 ||
!Factory::CheckSurfaceSize(surfaceSize)) {
PF_LOG("Invalid surface size of (%d x %d).\n", surfaceSize.width,
surfaceSize.height);
return PaintFragment{};
}
// Flush any pending notifications
nsContentUtils::FlushLayoutForTree(aDocShell->GetWindow());
// Initialize the recorder
SurfaceFormat format = SurfaceFormat::B8G8R8A8;
RefPtr<DrawTarget> referenceDt = Factory::CreateDrawTarget(
gfxPlatform::GetPlatform()->GetSoftwareBackend(), IntSize(1, 1), format);
// TODO: This may OOM crash if the content is complex enough
RefPtr<DrawEventRecorderMemory> recorder =
MakeAndAddRef<DrawEventRecorderMemory>(nullptr);
RefPtr<DrawTarget> dt = Factory::CreateRecordingDrawTarget(
recorder, referenceDt, IntRect(IntPoint(0, 0), surfaceSize));
RenderDocumentFlags renderDocFlags = RenderDocumentFlags::None;
if (!(aFlags & CrossProcessPaintFlags::DrawView)) {
renderDocFlags = (RenderDocumentFlags::IgnoreViewportScrolling |
RenderDocumentFlags::DocumentRelative);
}
// Perform the actual rendering
{
nsRect r(nsPresContext::CSSPixelsToAppUnits(rect.x),
nsPresContext::CSSPixelsToAppUnits(rect.y),
nsPresContext::CSSPixelsToAppUnits(rect.width),
nsPresContext::CSSPixelsToAppUnits(rect.height));
RefPtr<gfxContext> thebes = gfxContext::CreateOrNull(dt);
thebes->SetMatrix(Matrix::Scaling(aScale, aScale));
RefPtr<PresShell> presShell = presContext->PresShell();
Unused << presShell->RenderDocument(r, renderDocFlags, aBackgroundColor,
thebes);
}
ByteBuf recording = ByteBuf((uint8_t*)recorder->mOutputStream.mData,
recorder->mOutputStream.mLength,
recorder->mOutputStream.mCapacity);
recorder->mOutputStream.mData = nullptr;
recorder->mOutputStream.mLength = 0;
recorder->mOutputStream.mCapacity = 0;
return PaintFragment{
surfaceSize,
std::move(recording),
std::move(recorder->TakeDependentSurfaces()),
};
}
bool PaintFragment::IsEmpty() const {
return !mRecording.mData || mRecording.mLen == 0 || mSize == IntSize(0, 0);
}
PaintFragment::PaintFragment(IntSize aSize, ByteBuf&& aRecording,
nsTHashtable<nsUint64HashKey>&& aDependencies)
: mSize(aSize),
mRecording(std::move(aRecording)),
mDependencies(std::move(aDependencies)) {}
/* static */
bool CrossProcessPaint::Start(dom::WindowGlobalParent* aRoot,
const dom::DOMRect* aRect, float aScale,
nscolor aBackgroundColor,
CrossProcessPaintFlags aFlags,
dom::Promise* aPromise) {
MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
aScale = std::max(aScale, kMinPaintScale);
CPP_LOG(
"Starting paint. "
"[wgp=%p, "
"scale=%f, "
"color=(%u, %u, %u, %u)]\n",
aRoot, aScale, NS_GET_R(aBackgroundColor), NS_GET_G(aBackgroundColor),
NS_GET_B(aBackgroundColor), NS_GET_A(aBackgroundColor));
Maybe<IntRect> rect;
if (aRect) {
rect =
Some(IntRect::RoundOut((float)aRect->X(), (float)aRect->Y(),
(float)aRect->Width(), (float)aRect->Height()));
}
RefPtr<CrossProcessPaint> resolver =
new CrossProcessPaint(aPromise, aScale, aRoot);
if (aRoot->IsInProcess()) {
RefPtr<dom::WindowGlobalChild> childActor = aRoot->GetChildActor();
if (!childActor) {
return false;
}
// `BrowsingContext()` cannot be nullptr.
nsCOMPtr<nsIDocShell> docShell =
childActor->BrowsingContext()->GetDocShell();
if (!docShell) {
return false;
}
resolver->mPendingFragments += 1;
resolver->ReceiveFragment(
aRoot, PaintFragment::Record(docShell, rect, aScale, aBackgroundColor,
aFlags));
} else {
resolver->QueuePaint(aRoot, rect, aBackgroundColor, aFlags);
}
return true;
}
CrossProcessPaint::CrossProcessPaint(dom::Promise* aPromise, float aScale,
dom::WindowGlobalParent* aRoot)
: mPromise{aPromise}, mRoot{aRoot}, mScale{aScale}, mPendingFragments{0} {}
CrossProcessPaint::~CrossProcessPaint() {}
static dom::TabId GetTabId(dom::WindowGlobalParent* aWGP) {
// There is no unique TabId for a given WindowGlobalParent, as multiple
// WindowGlobalParents share the same PBrowser actor. However, we only
// ever queue one paint per PBrowser by just using the current
// WindowGlobalParent for a PBrowser. So we can interchange TabId and
// WindowGlobalParent when dealing with resolving surfaces.
RefPtr<dom::BrowserParent> browserParent = aWGP->GetBrowserParent();
return browserParent ? browserParent->GetTabId() : dom::TabId(0);
}
void CrossProcessPaint::ReceiveFragment(dom::WindowGlobalParent* aWGP,
PaintFragment&& aFragment) {
if (IsCleared()) {
CPP_LOG("Ignoring fragment from %p.\n", aWGP);
return;
}
dom::TabId surfaceId = GetTabId(aWGP);
MOZ_ASSERT(mPendingFragments > 0);
MOZ_ASSERT(!mReceivedFragments.GetValue(surfaceId));
MOZ_ASSERT(!aFragment.IsEmpty());
// Double check our invariants to protect against a compromised content
// process
if (mPendingFragments == 0 || mReceivedFragments.GetValue(surfaceId) ||
aFragment.IsEmpty()) {
CPP_LOG("Dropping invalid fragment from %p.\n", aWGP);
LostFragment(aWGP);
return;
}
CPP_LOG("Receiving fragment from %p(%llu).\n", aWGP, (uint64_t)surfaceId);
// Queue paints for child tabs
for (auto iter = aFragment.mDependencies.Iter(); !iter.Done(); iter.Next()) {
auto dependency = dom::TabId(iter.Get()->GetKey());
// Get the current WindowGlobalParent of the remote browser that was marked
// as a dependency
dom::ContentProcessManager* cpm =
dom::ContentProcessManager::GetSingleton();
dom::ContentParentId cpId = cpm->GetTabProcessId(dependency);
RefPtr<dom::BrowserParent> browser =
cpm->GetBrowserParentByProcessAndTabId(cpId, dependency);
RefPtr<dom::WindowGlobalParent> wgp =
browser->GetBrowsingContext()->GetCurrentWindowGlobal();
if (!wgp) {
CPP_LOG("Skipping dependency %llu with no current WGP.\n",
(uint64_t)dependency);
continue;
}
// TODO: Apply some sort of clipping to visible bounds here (Bug 1562720)
QueuePaint(wgp, Nothing());
}
mReceivedFragments.Put(surfaceId, std::move(aFragment));
mPendingFragments -= 1;
// Resolve this paint if we have received all pending fragments
MaybeResolve();
}
void CrossProcessPaint::LostFragment(dom::WindowGlobalParent* aWGP) {
if (IsCleared()) {
CPP_LOG("Ignoring lost fragment from %p.\n", aWGP);
return;
}
mPromise->MaybeReject(NS_ERROR_LOSS_OF_SIGNIFICANT_DATA);
Clear();
}
void CrossProcessPaint::QueuePaint(dom::WindowGlobalParent* aWGP,
const Maybe<IntRect>& aRect,
nscolor aBackgroundColor,
CrossProcessPaintFlags aFlags) {
MOZ_ASSERT(!mReceivedFragments.GetValue(GetTabId(aWGP)));
CPP_LOG("Queueing paint for %p.\n", aWGP);
aWGP->DrawSnapshotInternal(this, aRect, mScale, aBackgroundColor,
(uint32_t)aFlags);
mPendingFragments += 1;
}
void CrossProcessPaint::Clear() {
mPromise = nullptr;
mPendingFragments = 0;
mReceivedFragments.Clear();
}
bool CrossProcessPaint::IsCleared() const { return !mPromise; }
void CrossProcessPaint::MaybeResolve() {
// Don't do anything if we aren't ready, experienced an error, or already
// resolved this paint
if (IsCleared() || mPendingFragments > 0) {
CPP_LOG("Not ready to resolve yet, have %u fragments left.\n",
mPendingFragments);
return;
}
CPP_LOG("Starting to resolve fragments.\n");
// Resolve the paint fragments from the bottom up
ResolvedSurfaceMap resolved;
{
nsresult rv = ResolveInternal(GetTabId(mRoot), &resolved);
if (NS_FAILED(rv)) {
CPP_LOG("Couldn't resolve.\n");
mPromise->MaybeReject(rv);
Clear();
return;
}
}
// Grab the result from the resolved table.
RefPtr<SourceSurface> root = resolved.Get(GetTabId(mRoot));
CPP_LOG("Resolved all fragments.\n");
ErrorResult rv;
RefPtr<dom::ImageBitmap> bitmap = dom::ImageBitmap::CreateFromSourceSurface(
mPromise->GetParentObject(), root, rv);
if (!rv.Failed()) {
CPP_LOG("Success, fulfilling promise.\n");
mPromise->MaybeResolve(bitmap);
} else {
CPP_LOG("Couldn't create ImageBitmap for SourceSurface.\n");
mPromise->MaybeReject(rv);
}
Clear();
}
nsresult CrossProcessPaint::ResolveInternal(dom::TabId aTabId,
ResolvedSurfaceMap* aResolved) {
// We should not have resolved this paint already
MOZ_ASSERT(!aResolved->GetWeak(aTabId));
CPP_LOG("Resolving fragment %llu.\n", (uint64_t)aTabId);
Maybe<PaintFragment> fragment = mReceivedFragments.GetAndRemove(aTabId);
if (!fragment) {
return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
}
// Rasterize all the dependencies first so that we can resolve this fragment
for (auto iter = fragment->mDependencies.Iter(); !iter.Done(); iter.Next()) {
auto dependency = dom::TabId(iter.Get()->GetKey());
nsresult rv = ResolveInternal(dependency, aResolved);
if (NS_FAILED(rv)) {
return rv;
}
}
// Create the destination draw target
RefPtr<DrawTarget> drawTarget =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
fragment->mSize, SurfaceFormat::B8G8R8A8);
if (!drawTarget || !drawTarget->IsValid()) {
CPP_LOG("Couldn't create (%d x %d) surface for fragment %llu.\n",
fragment->mSize.width, fragment->mSize.height, (uint64_t)aTabId);
return NS_ERROR_FAILURE;
}
// Translate the recording using our child tabs
{
InlineTranslator translator(drawTarget, nullptr);
translator.SetExternalSurfaces(aResolved);
if (!translator.TranslateRecording((char*)fragment->mRecording.mData,
fragment->mRecording.mLen)) {
CPP_LOG("Couldn't translate recording for fragment %llu.\n",
(uint64_t)aTabId);
return NS_ERROR_FAILURE;
}
}
RefPtr<SourceSurface> snapshot = drawTarget->Snapshot();
if (!snapshot) {
CPP_LOG("Couldn't get snapshot for fragment %llu.\n", (uint64_t)aTabId);
return NS_ERROR_FAILURE;
}
// We are done with the resolved images of our dependencies, let's remove
// them
for (auto iter = fragment->mDependencies.Iter(); !iter.Done(); iter.Next()) {
auto dependency = iter.Get()->GetKey();
aResolved->Remove(dependency);
}
aResolved->Put(aTabId, snapshot);
return NS_OK;
}
} // namespace gfx
} // namespace mozilla