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/* -*- Mode: C++; tab-width: 40; 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 "nsICanvasRenderingContextInternal.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/CanvasUtils.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/gfx/DrawTargetRecording.h"
#include "nsContentUtils.h"
#include "nsPIDOMWindow.h"
#include "nsRefreshDriver.h"
nsICanvasRenderingContextInternal::nsICanvasRenderingContextInternal() =
default;
nsICanvasRenderingContextInternal::~nsICanvasRenderingContextInternal() =
default;
mozilla::PresShell* nsICanvasRenderingContextInternal::GetPresShell() {
if (mCanvasElement) {
return mCanvasElement->OwnerDoc()->GetPresShell();
}
return nullptr;
}
nsIGlobalObject* nsICanvasRenderingContextInternal::GetParentObject() const {
if (mCanvasElement) {
return mCanvasElement->OwnerDoc()->GetScopeObject();
}
if (mOffscreenCanvas) {
return mOffscreenCanvas->GetParentObject();
}
return nullptr;
}
nsIPrincipal* nsICanvasRenderingContextInternal::PrincipalOrNull() const {
if (mCanvasElement) {
return mCanvasElement->NodePrincipal();
}
if (mOffscreenCanvas) {
nsIGlobalObject* global = mOffscreenCanvas->GetParentObject();
if (global) {
return global->PrincipalOrNull();
}
}
return nullptr;
}
nsICookieJarSettings* nsICanvasRenderingContextInternal::GetCookieJarSettings()
const {
if (mCanvasElement) {
return mCanvasElement->OwnerDoc()->CookieJarSettings();
}
// If there is an offscreen canvas, attempt to retrieve its owner window
// and return the cookieJarSettings for the window's document, if available.
if (mOffscreenCanvas) {
nsCOMPtr<nsPIDOMWindowInner> win =
do_QueryInterface(mOffscreenCanvas->GetOwnerGlobal());
if (win) {
return win->GetExtantDoc()->CookieJarSettings();
}
// If the owner window cannot be retrieved, check if there is a current
// worker and return its cookie jar settings if available.
mozilla::dom::WorkerPrivate* worker =
mozilla::dom::GetCurrentThreadWorkerPrivate();
if (worker) {
return worker->CookieJarSettings();
}
}
return nullptr;
}
void nsICanvasRenderingContextInternal::RemovePostRefreshObserver() {
if (mRefreshDriver) {
mRefreshDriver->RemovePostRefreshObserver(this);
mRefreshDriver = nullptr;
}
}
void nsICanvasRenderingContextInternal::AddPostRefreshObserverIfNecessary() {
if (!GetPresShell() || !GetPresShell()->GetPresContext() ||
!GetPresShell()->GetPresContext()->RefreshDriver()) {
return;
}
mRefreshDriver = GetPresShell()->GetPresContext()->RefreshDriver();
mRefreshDriver->AddPostRefreshObserver(this);
}
void nsICanvasRenderingContextInternal::DoSecurityCheck(
nsIPrincipal* aPrincipal, bool aForceWriteOnly, bool aCORSUsed) {
if (mCanvasElement) {
mozilla::CanvasUtils::DoDrawImageSecurityCheck(mCanvasElement, aPrincipal,
aForceWriteOnly, aCORSUsed);
} else if (mOffscreenCanvas) {
mozilla::CanvasUtils::DoDrawImageSecurityCheck(mOffscreenCanvas, aPrincipal,
aForceWriteOnly, aCORSUsed);
}
}
bool nsICanvasRenderingContextInternal::ShouldResistFingerprinting(
mozilla::RFPTarget aTarget) const {
if (mCanvasElement) {
return mCanvasElement->OwnerDoc()->ShouldResistFingerprinting(aTarget);
}
if (mOffscreenCanvas) {
return mOffscreenCanvas->ShouldResistFingerprinting(aTarget);
}
// Last resort, just check the global preference
return nsContentUtils::ShouldResistFingerprinting("Fallback", aTarget);
}
bool nsICanvasRenderingContextInternal::DispatchEvent(
const nsAString& eventName, mozilla::CanBubble aCanBubble,
mozilla::Cancelable aIsCancelable) const {
bool useDefaultHandler = true;
if (mCanvasElement) {
nsContentUtils::DispatchTrustedEvent(mCanvasElement->OwnerDoc(),
mCanvasElement, eventName, aCanBubble,
aIsCancelable, &useDefaultHandler);
} else if (mOffscreenCanvas) {
// OffscreenCanvas case
auto event = mozilla::MakeRefPtr<mozilla::dom::Event>(mOffscreenCanvas,
nullptr, nullptr);
event->InitEvent(eventName, aCanBubble, aIsCancelable);
event->SetTrusted(true);
useDefaultHandler = mOffscreenCanvas->DispatchEvent(
*event, mozilla::dom::CallerType::System, mozilla::IgnoreErrors());
}
return useDefaultHandler;
}
already_AddRefed<mozilla::gfx::SourceSurface>
nsICanvasRenderingContextInternal::GetOptimizedSnapshot(
mozilla::gfx::DrawTarget* aTarget, gfxAlphaType* out_alphaType) {
if (aTarget &&
aTarget->GetBackendType() == mozilla::gfx::BackendType::RECORDING) {
if (auto* actor = SupportsSnapshotExternalCanvas()) {
// If this snapshot is for a recording target, then try to avoid reading
// back any data by using SnapshotExternalCanvas instead. This avoids
// having sync interactions between GPU and content process.
if (RefPtr<mozilla::gfx::SourceSurface> surf =
static_cast<mozilla::gfx::DrawTargetRecording*>(aTarget)
->SnapshotExternalCanvas(this, actor)) {
if (out_alphaType) {
*out_alphaType =
GetIsOpaque() ? gfxAlphaType::Opaque : gfxAlphaType::Premult;
}
return surf.forget();
}
}
}
return GetSurfaceSnapshot(out_alphaType);
}
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