mozilla
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gecko-dev
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gecko-dev/dom/html/HTMLCanvasElement.cpp

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/* -*- Mode: C++; tab-width: 2; 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 "mozilla/dom/HTMLCanvasElement.h"
#include "ImageEncoder.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "Layers.h"
#include "mozilla/Assertions.h"
#include "mozilla/Base64.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/dom/CanvasRenderingContext2D.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/HTMLCanvasElementBinding.h"
#include "mozilla/dom/MouseEvent.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsAttrValueInlines.h"
#include "nsContentUtils.h"
#include "nsDisplayList.h"
#include "nsDOMJSUtils.h"
#include "nsIScriptSecurityManager.h"
#include "nsITimer.h"
#include "nsIWritablePropertyBag2.h"
#include "nsIXPConnect.h"
#include "nsJSUtils.h"
#include "nsLayoutUtils.h"
#include "nsMathUtils.h"
#include "nsNetUtil.h"
#include "nsStreamUtils.h"
#include "ActiveLayerTracker.h"
#include "WebGL1Context.h"
#include "WebGL2Context.h"
using namespace mozilla::layers;
using namespace mozilla::gfx;
NS_IMPL_NS_NEW_HTML_ELEMENT(Canvas)
namespace {
typedef mozilla::dom::HTMLImageElementOrHTMLCanvasElementOrHTMLVideoElement
HTMLImageOrCanvasOrVideoElement;
} // anonymous namespace
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(HTMLCanvasPrintState, mCanvas,
mContext, mCallback)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(HTMLCanvasPrintState, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(HTMLCanvasPrintState, Release)
HTMLCanvasPrintState::HTMLCanvasPrintState(HTMLCanvasElement* aCanvas,
nsICanvasRenderingContextInternal* aContext,
nsITimerCallback* aCallback)
: mIsDone(false), mPendingNotify(false), mCanvas(aCanvas),
mContext(aContext), mCallback(aCallback)
{
}
HTMLCanvasPrintState::~HTMLCanvasPrintState()
{
}
/* virtual */ JSObject*
HTMLCanvasPrintState::WrapObject(JSContext* aCx)
{
return MozCanvasPrintStateBinding::Wrap(aCx, this);
}
nsISupports*
HTMLCanvasPrintState::Context() const
{
return mContext;
}
void
HTMLCanvasPrintState::Done()
{
if (!mPendingNotify && !mIsDone) {
// The canvas needs to be invalidated for printing reftests on linux to
// work.
if (mCanvas) {
mCanvas->InvalidateCanvas();
}
nsRefPtr<nsRunnableMethod<HTMLCanvasPrintState> > doneEvent =
NS_NewRunnableMethod(this, &HTMLCanvasPrintState::NotifyDone);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(doneEvent))) {
mPendingNotify = true;
}
}
}
void
HTMLCanvasPrintState::NotifyDone()
{
mIsDone = true;
mPendingNotify = false;
if (mCallback) {
mCallback->Notify(nullptr);
}
}
// ---------------------------------------------------------------------------
HTMLCanvasElement::HTMLCanvasElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: nsGenericHTMLElement(aNodeInfo),
mWriteOnly(false)
{
}
HTMLCanvasElement::~HTMLCanvasElement()
{
ResetPrintCallback();
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLCanvasElement, nsGenericHTMLElement,
mCurrentContext, mPrintCallback,
mPrintState, mOriginalCanvas)
NS_IMPL_ADDREF_INHERITED(HTMLCanvasElement, Element)
NS_IMPL_RELEASE_INHERITED(HTMLCanvasElement, Element)
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLCanvasElement)
NS_INTERFACE_TABLE_INHERITED(HTMLCanvasElement, nsIDOMHTMLCanvasElement)
NS_INTERFACE_TABLE_TAIL_INHERITING(nsGenericHTMLElement)
NS_IMPL_ELEMENT_CLONE(HTMLCanvasElement)
/* virtual */ JSObject*
HTMLCanvasElement::WrapNode(JSContext* aCx)
{
return HTMLCanvasElementBinding::Wrap(aCx, this);
}
nsIntSize
HTMLCanvasElement::GetWidthHeight()
{
nsIntSize size(DEFAULT_CANVAS_WIDTH, DEFAULT_CANVAS_HEIGHT);
const nsAttrValue* value;
if ((value = GetParsedAttr(nsGkAtoms::width)) &&
value->Type() == nsAttrValue::eInteger)
{
size.width = value->GetIntegerValue();
}
if ((value = GetParsedAttr(nsGkAtoms::height)) &&
value->Type() == nsAttrValue::eInteger)
{
size.height = value->GetIntegerValue();
}
MOZ_ASSERT(size.width >= 0 && size.height >= 0,
"we should've required <canvas> width/height attrs to be "
"unsigned (non-negative) values");
return size;
}
NS_IMPL_UINT_ATTR_DEFAULT_VALUE(HTMLCanvasElement, Width, width, DEFAULT_CANVAS_WIDTH)
NS_IMPL_UINT_ATTR_DEFAULT_VALUE(HTMLCanvasElement, Height, height, DEFAULT_CANVAS_HEIGHT)
NS_IMPL_BOOL_ATTR(HTMLCanvasElement, MozOpaque, moz_opaque)
nsresult
HTMLCanvasElement::SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
nsIAtom* aPrefix, const nsAString& aValue,
bool aNotify)
{
nsresult rv = nsGenericHTMLElement::SetAttr(aNameSpaceID, aName, aPrefix, aValue,
aNotify);
if (NS_SUCCEEDED(rv) && mCurrentContext &&
aNameSpaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::width || aName == nsGkAtoms::height || aName == nsGkAtoms::moz_opaque))
{
rv = UpdateContext(nullptr, JS::NullHandleValue);
NS_ENSURE_SUCCESS(rv, rv);
}
return rv;
}
nsresult
HTMLCanvasElement::UnsetAttr(int32_t aNameSpaceID, nsIAtom* aName,
bool aNotify)
{
nsresult rv = nsGenericHTMLElement::UnsetAttr(aNameSpaceID, aName, aNotify);
if (NS_SUCCEEDED(rv) && mCurrentContext &&
aNameSpaceID == kNameSpaceID_None &&
(aName == nsGkAtoms::width || aName == nsGkAtoms::height || aName == nsGkAtoms::moz_opaque))
{
rv = UpdateContext(nullptr, JS::NullHandleValue);
NS_ENSURE_SUCCESS(rv, rv);
}
return rv;
}
void
HTMLCanvasElement::HandlePrintCallback(nsPresContext::nsPresContextType aType)
{
// Only call the print callback here if 1) we're in a print testing mode or
// print preview mode, 2) the canvas has a print callback and 3) the callback
// hasn't already been called. For real printing the callback is handled in
// nsSimplePageSequenceFrame::PrePrintNextPage.
if ((aType == nsPresContext::eContext_PageLayout ||
aType == nsPresContext::eContext_PrintPreview) &&
!mPrintState && GetMozPrintCallback()) {
DispatchPrintCallback(nullptr);
}
}
nsresult
HTMLCanvasElement::DispatchPrintCallback(nsITimerCallback* aCallback)
{
// For print reftests the context may not be initialized yet, so get a context
// so mCurrentContext is set.
if (!mCurrentContext) {
nsresult rv;
nsCOMPtr<nsISupports> context;
rv = GetContext(NS_LITERAL_STRING("2d"), getter_AddRefs(context));
NS_ENSURE_SUCCESS(rv, rv);
}
mPrintState = new HTMLCanvasPrintState(this, mCurrentContext, aCallback);
nsRefPtr<nsRunnableMethod<HTMLCanvasElement> > renderEvent =
NS_NewRunnableMethod(this, &HTMLCanvasElement::CallPrintCallback);
return NS_DispatchToCurrentThread(renderEvent);
}
void
HTMLCanvasElement::CallPrintCallback()
{
ErrorResult rv;
GetMozPrintCallback()->Call(*mPrintState, rv);
}
void
HTMLCanvasElement::ResetPrintCallback()
{
if (mPrintState) {
mPrintState = nullptr;
}
}
bool
HTMLCanvasElement::IsPrintCallbackDone()
{
if (mPrintState == nullptr) {
return true;
}
return mPrintState->mIsDone;
}
HTMLCanvasElement*
HTMLCanvasElement::GetOriginalCanvas()
{
return mOriginalCanvas ? mOriginalCanvas.get() : this;
}
nsresult
HTMLCanvasElement::CopyInnerTo(Element* aDest)
{
nsresult rv = nsGenericHTMLElement::CopyInnerTo(aDest);
NS_ENSURE_SUCCESS(rv, rv);
if (aDest->OwnerDoc()->IsStaticDocument()) {
HTMLCanvasElement* dest = static_cast<HTMLCanvasElement*>(aDest);
dest->mOriginalCanvas = this;
nsCOMPtr<nsISupports> cxt;
dest->GetContext(NS_LITERAL_STRING("2d"), getter_AddRefs(cxt));
nsRefPtr<CanvasRenderingContext2D> context2d =
static_cast<CanvasRenderingContext2D*>(cxt.get());
if (context2d && !mPrintCallback) {
HTMLImageOrCanvasOrVideoElement element;
element.SetAsHTMLCanvasElement() = this;
ErrorResult err;
context2d->DrawImage(element,
0.0, 0.0, err);
rv = err.ErrorCode();
}
}
return rv;
}
nsresult HTMLCanvasElement::PreHandleEvent(EventChainPreVisitor& aVisitor)
{
if (aVisitor.mEvent->mClass == eMouseEventClass) {
WidgetMouseEventBase* evt = (WidgetMouseEventBase*)aVisitor.mEvent;
if (mCurrentContext) {
nsIFrame *frame = GetPrimaryFrame();
if (!frame)
return NS_OK;
nsPoint ptInRoot = nsLayoutUtils::GetEventCoordinatesRelativeTo(evt, frame);
nsRect paddingRect = frame->GetContentRectRelativeToSelf();
Point hitpoint;
hitpoint.x = (ptInRoot.x - paddingRect.x) / AppUnitsPerCSSPixel();
hitpoint.y = (ptInRoot.y - paddingRect.y) / AppUnitsPerCSSPixel();
evt->region = mCurrentContext->GetHitRegion(hitpoint);
aVisitor.mCanHandle = true;
}
}
return nsGenericHTMLElement::PreHandleEvent(aVisitor);
}
nsChangeHint
HTMLCanvasElement::GetAttributeChangeHint(const nsIAtom* aAttribute,
int32_t aModType) const
{
nsChangeHint retval =
nsGenericHTMLElement::GetAttributeChangeHint(aAttribute, aModType);
if (aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height)
{
NS_UpdateHint(retval, NS_STYLE_HINT_REFLOW);
} else if (aAttribute == nsGkAtoms::moz_opaque)
{
NS_UpdateHint(retval, NS_STYLE_HINT_VISUAL);
}
return retval;
}
bool
HTMLCanvasElement::ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult)
{
if (aNamespaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height)) {
return aResult.ParseNonNegativeIntValue(aValue);
}
return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
aResult);
}
// HTMLCanvasElement::toDataURL
NS_IMETHODIMP
HTMLCanvasElement::ToDataURL(const nsAString& aType, JS::Handle<JS::Value> aParams,
JSContext* aCx, nsAString& aDataURL)
{
// do a trust check if this is a write-only canvas
if (mWriteOnly && !nsContentUtils::IsCallerChrome()) {
return NS_ERROR_DOM_SECURITY_ERR;
}
return ToDataURLImpl(aCx, aType, aParams, aDataURL);
}
// HTMLCanvasElement::mozFetchAsStream
NS_IMETHODIMP
HTMLCanvasElement::MozFetchAsStream(nsIInputStreamCallback *aCallback,
const nsAString& aType)
{
if (!nsContentUtils::IsCallerChrome())
return NS_ERROR_FAILURE;
nsresult rv;
nsCOMPtr<nsIInputStream> inputData;
nsAutoString type(aType);
rv = ExtractData(type, EmptyString(), getter_AddRefs(inputData));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIAsyncInputStream> asyncData = do_QueryInterface(inputData, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIThread> mainThread;
rv = NS_GetMainThread(getter_AddRefs(mainThread));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIInputStreamCallback> asyncCallback =
NS_NewInputStreamReadyEvent(aCallback, mainThread);
return asyncCallback->OnInputStreamReady(asyncData);
}
void
HTMLCanvasElement::SetMozPrintCallback(PrintCallback* aCallback)
{
mPrintCallback = aCallback;
}
PrintCallback*
HTMLCanvasElement::GetMozPrintCallback() const
{
if (mOriginalCanvas) {
return mOriginalCanvas->GetMozPrintCallback();
}
return mPrintCallback;
}
nsresult
HTMLCanvasElement::ExtractData(nsAString& aType,
const nsAString& aOptions,
nsIInputStream** aStream)
{
return ImageEncoder::ExtractData(aType,
aOptions,
GetSize(),
mCurrentContext,
aStream);
}
nsresult
HTMLCanvasElement::ParseParams(JSContext* aCx,
const nsAString& aType,
const JS::Value& aEncoderOptions,
nsAString& aParams,
bool* usingCustomParseOptions)
{
// Quality parameter is only valid for the image/jpeg MIME type
if (aType.EqualsLiteral("image/jpeg")) {
if (aEncoderOptions.isNumber()) {
double quality = aEncoderOptions.toNumber();
// Quality must be between 0.0 and 1.0, inclusive
if (quality >= 0.0 && quality <= 1.0) {
aParams.AppendLiteral("quality=");
aParams.AppendInt(NS_lround(quality * 100.0));
}
}
}
// If we haven't parsed the aParams check for proprietary options.
// The proprietary option -moz-parse-options will take a image lib encoder
// parse options string as is and pass it to the encoder.
*usingCustomParseOptions = false;
if (aParams.Length() == 0 && aEncoderOptions.isString()) {
NS_NAMED_LITERAL_STRING(mozParseOptions, "-moz-parse-options:");
nsAutoJSString paramString;
if (!paramString.init(aCx, aEncoderOptions.toString())) {
return NS_ERROR_FAILURE;
}
if (StringBeginsWith(paramString, mozParseOptions)) {
nsDependentSubstring parseOptions = Substring(paramString,
mozParseOptions.Length(),
paramString.Length() -
mozParseOptions.Length());
aParams.Append(parseOptions);
*usingCustomParseOptions = true;
}
}
return NS_OK;
}
nsresult
HTMLCanvasElement::ToDataURLImpl(JSContext* aCx,
const nsAString& aMimeType,
const JS::Value& aEncoderOptions,
nsAString& aDataURL)
{
nsIntSize size = GetWidthHeight();
if (size.height == 0 || size.width == 0) {
aDataURL = NS_LITERAL_STRING("data:,");
return NS_OK;
}
nsAutoString type;
nsContentUtils::ASCIIToLower(aMimeType, type);
nsAutoString params;
bool usingCustomParseOptions;
nsresult rv =
ParseParams(aCx, type, aEncoderOptions, params, &usingCustomParseOptions);
if (NS_FAILED(rv)) {
return rv;
}
nsCOMPtr<nsIInputStream> stream;
rv = ExtractData(type, params, getter_AddRefs(stream));
// If there are unrecognized custom parse options, we should fall back to
// the default values for the encoder without any options at all.
if (rv == NS_ERROR_INVALID_ARG && usingCustomParseOptions) {
rv = ExtractData(type, EmptyString(), getter_AddRefs(stream));
}
NS_ENSURE_SUCCESS(rv, rv);
// build data URL string
aDataURL = NS_LITERAL_STRING("data:") + type + NS_LITERAL_STRING(";base64,");
uint64_t count;
rv = stream->Available(&count);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(count <= UINT32_MAX, NS_ERROR_FILE_TOO_BIG);
return Base64EncodeInputStream(stream, aDataURL, (uint32_t)count, aDataURL.Length());
}
void
HTMLCanvasElement::ToBlob(JSContext* aCx,
FileCallback& aCallback,
const nsAString& aType,
JS::Handle<JS::Value> aParams,
ErrorResult& aRv)
{
// do a trust check if this is a write-only canvas
if (mWriteOnly && !nsContentUtils::IsCallerChrome()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
nsAutoString type;
nsContentUtils::ASCIIToLower(aType, type);
nsAutoString params;
bool usingCustomParseOptions;
aRv = ParseParams(aCx, type, aParams, params, &usingCustomParseOptions);
if (aRv.Failed()) {
return;
}
#ifdef DEBUG
if (mCurrentContext) {
// We disallow canvases of width or height zero, and set them to 1, so
// we will have a discrepancy with the sizes of the canvas and the context.
// That discrepancy is OK, the rest are not.
nsIntSize elementSize = GetWidthHeight();
MOZ_ASSERT(elementSize.width == mCurrentContext->GetWidth() ||
(elementSize.width == 0 && mCurrentContext->GetWidth() == 1));
MOZ_ASSERT(elementSize.height == mCurrentContext->GetHeight() ||
(elementSize.height == 0 && mCurrentContext->GetHeight() == 1));
}
#endif
uint8_t* imageBuffer = nullptr;
int32_t format = 0;
if (mCurrentContext) {
mCurrentContext->GetImageBuffer(&imageBuffer, &format);
}
// Encoder callback when encoding is complete.
class EncodeCallback : public EncodeCompleteCallback
{
public:
EncodeCallback(nsIGlobalObject* aGlobal, FileCallback* aCallback)
: mGlobal(aGlobal)
, mFileCallback(aCallback) {}
// This is called on main thread.
nsresult ReceiveBlob(already_AddRefed<File> aBlob)
{
nsRefPtr<File> blob = aBlob;
uint64_t size;
nsresult rv = blob->GetSize(&size);
if (NS_SUCCEEDED(rv)) {
AutoJSAPI jsapi;
if (jsapi.Init(mGlobal)) {
JS_updateMallocCounter(jsapi.cx(), size);
}
}
nsRefPtr<File> newBlob = new File(mGlobal, blob->Impl());
mozilla::ErrorResult error;
mFileCallback->Call(*newBlob, error);
mGlobal = nullptr;
mFileCallback = nullptr;
return error.ErrorCode();
}
nsCOMPtr<nsIGlobalObject> mGlobal;
nsRefPtr<FileCallback> mFileCallback;
};
nsCOMPtr<nsIGlobalObject> global = OwnerDoc()->GetScopeObject();
MOZ_ASSERT(global);
nsRefPtr<EncodeCompleteCallback> callback = new EncodeCallback(global, &aCallback);
aRv = ImageEncoder::ExtractDataAsync(type,
params,
usingCustomParseOptions,
imageBuffer,
format,
GetSize(),
callback);
}
already_AddRefed<File>
HTMLCanvasElement::MozGetAsFile(const nsAString& aName,
const nsAString& aType,
ErrorResult& aRv)
{
nsCOMPtr<nsIDOMFile> file;
aRv = MozGetAsFile(aName, aType, getter_AddRefs(file));
nsRefPtr<File> tmp = static_cast<File*>(file.get());
return tmp.forget();
}
NS_IMETHODIMP
HTMLCanvasElement::MozGetAsFile(const nsAString& aName,
const nsAString& aType,
nsIDOMFile** aResult)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eMozGetAsFile);
// do a trust check if this is a write-only canvas
if ((mWriteOnly) &&
!nsContentUtils::IsCallerChrome()) {
return NS_ERROR_DOM_SECURITY_ERR;
}
return MozGetAsFileImpl(aName, aType, aResult);
}
nsresult
HTMLCanvasElement::MozGetAsFileImpl(const nsAString& aName,
const nsAString& aType,
nsIDOMFile** aResult)
{
nsCOMPtr<nsIInputStream> stream;
nsAutoString type(aType);
nsresult rv = ExtractData(type, EmptyString(), getter_AddRefs(stream));
NS_ENSURE_SUCCESS(rv, rv);
uint64_t imgSize;
rv = stream->Available(&imgSize);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(imgSize <= UINT32_MAX, NS_ERROR_FILE_TOO_BIG);
void* imgData = nullptr;
rv = NS_ReadInputStreamToBuffer(stream, &imgData, (uint32_t)imgSize);
NS_ENSURE_SUCCESS(rv, rv);
JSContext* cx = nsContentUtils::GetCurrentJSContext();
if (cx) {
JS_updateMallocCounter(cx, imgSize);
}
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(OwnerDoc()->GetScopeObject());
// The File takes ownership of the buffer
nsRefPtr<File> file =
File::CreateMemoryFile(win, imgData, (uint32_t)imgSize, aName, type,
PR_Now());
file.forget(aResult);
return NS_OK;
}
static bool
GetCanvasContextType(const nsAString& str, CanvasContextType* const out_type)
{
if (str.EqualsLiteral("2d")) {
*out_type = CanvasContextType::Canvas2D;
return true;
}
if (str.EqualsLiteral("experimental-webgl")) {
*out_type = CanvasContextType::WebGL1;
return true;
}
#ifdef MOZ_WEBGL_CONFORMANT
if (str.EqualsLiteral("webgl")) {
/* WebGL 1.0, $2.1 "Context Creation":
* If the user agent supports both the webgl and experimental-webgl
* canvas context types, they shall be treated as aliases.
*/
*out_type = CanvasContextType::WebGL1;
return true;
}
#endif
if (WebGL2Context::IsSupported()) {
if (str.EqualsLiteral("experimental-webgl2")) {
*out_type = CanvasContextType::WebGL2;
return true;
}
}
return false;
}
static already_AddRefed<nsICanvasRenderingContextInternal>
CreateContextForCanvas(CanvasContextType contextType, HTMLCanvasElement* canvas)
{
nsRefPtr<nsICanvasRenderingContextInternal> ret;
switch (contextType) {
case CanvasContextType::Canvas2D:
Telemetry::Accumulate(Telemetry::CANVAS_2D_USED, 1);
ret = new CanvasRenderingContext2D();
break;
case CanvasContextType::WebGL1:
Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
ret = WebGL1Context::Create();
if (!ret)
return nullptr;
break;
case CanvasContextType::WebGL2:
Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
ret = WebGL2Context::Create();
if (!ret)
return nullptr;
break;
}
MOZ_ASSERT(ret);
ret->SetCanvasElement(canvas);
return ret.forget();
}
nsresult
HTMLCanvasElement::GetContext(const nsAString& aContextId,
nsISupports** aContext)
{
ErrorResult rv;
*aContext = GetContext(nullptr, aContextId, JS::NullHandleValue, rv).take();
return rv.ErrorCode();
}
already_AddRefed<nsISupports>
HTMLCanvasElement::GetContext(JSContext* aCx,
const nsAString& aContextId,
JS::Handle<JS::Value> aContextOptions,
ErrorResult& rv)
{
CanvasContextType contextType;
if (!GetCanvasContextType(aContextId, &contextType))
return nullptr;
if (!mCurrentContext) {
// This canvas doesn't have a context yet.
nsRefPtr<nsICanvasRenderingContextInternal> context;
context = CreateContextForCanvas(contextType, this);
if (!context)
return nullptr;
// Ensure that the context participates in CC. Note that returning a
// CC participant from QI doesn't addref.
nsXPCOMCycleCollectionParticipant* cp = nullptr;
CallQueryInterface(context, &cp);
if (!cp) {
rv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
mCurrentContext = context.forget();
mCurrentContextType = contextType;
rv = UpdateContext(aCx, aContextOptions);
if (rv.Failed()) {
rv = NS_OK; // See bug 645792
return nullptr;
}
} else {
// We already have a context of some type.
if (contextType != mCurrentContextType)
return nullptr;
}
nsCOMPtr<nsICanvasRenderingContextInternal> context = mCurrentContext;
return context.forget();
}
NS_IMETHODIMP
HTMLCanvasElement::MozGetIPCContext(const nsAString& aContextId,
nsISupports **aContext)
{
if(!nsContentUtils::IsCallerChrome()) {
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
return NS_ERROR_DOM_SECURITY_ERR;
}
// We only support 2d shmem contexts for now.
if (!aContextId.EqualsLiteral("2d"))
return NS_ERROR_INVALID_ARG;
CanvasContextType contextType = CanvasContextType::Canvas2D;
if (!mCurrentContext) {
// This canvas doesn't have a context yet.
nsRefPtr<nsICanvasRenderingContextInternal> context;
context = CreateContextForCanvas(contextType, this);
if (!context) {
*aContext = nullptr;
return NS_OK;
}
mCurrentContext = context;
mCurrentContext->SetIsIPC(true);
mCurrentContextType = contextType;
nsresult rv = UpdateContext(nullptr, JS::NullHandleValue);
NS_ENSURE_SUCCESS(rv, rv);
} else {
// We already have a context of some type.
if (contextType != mCurrentContextType)
return NS_ERROR_INVALID_ARG;
}
NS_ADDREF (*aContext = mCurrentContext);
return NS_OK;
}
nsresult
HTMLCanvasElement::UpdateContext(JSContext* aCx, JS::Handle<JS::Value> aNewContextOptions)
{
if (!mCurrentContext)
return NS_OK;
nsIntSize sz = GetWidthHeight();
nsresult rv = mCurrentContext->SetIsOpaque(HasAttr(kNameSpaceID_None, nsGkAtoms::moz_opaque));
if (NS_FAILED(rv)) {
mCurrentContext = nullptr;
return rv;
}
rv = mCurrentContext->SetContextOptions(aCx, aNewContextOptions);
if (NS_FAILED(rv)) {
mCurrentContext = nullptr;
return rv;
}
rv = mCurrentContext->SetDimensions(sz.width, sz.height);
if (NS_FAILED(rv)) {
mCurrentContext = nullptr;
return rv;
}
return rv;
}
nsIntSize
HTMLCanvasElement::GetSize()
{
return GetWidthHeight();
}
bool
HTMLCanvasElement::IsWriteOnly()
{
return mWriteOnly;
}
void
HTMLCanvasElement::SetWriteOnly()
{
mWriteOnly = true;
}
void
HTMLCanvasElement::InvalidateCanvasContent(const gfx::Rect* damageRect)
{
// We don't need to flush anything here; if there's no frame or if
// we plan to reframe we don't need to invalidate it anyway.
nsIFrame *frame = GetPrimaryFrame();
if (!frame)
return;
ActiveLayerTracker::NotifyContentChange(frame);
Layer* layer = nullptr;
if (damageRect) {
nsIntSize size = GetWidthHeight();
if (size.width != 0 && size.height != 0) {
gfx::Rect realRect(*damageRect);
realRect.RoundOut();
// then make it a nsIntRect
nsIntRect invalRect(realRect.X(), realRect.Y(),
realRect.Width(), realRect.Height());
layer = frame->InvalidateLayer(nsDisplayItem::TYPE_CANVAS, &invalRect);
}
} else {
layer = frame->InvalidateLayer(nsDisplayItem::TYPE_CANVAS);
}
if (layer) {
static_cast<CanvasLayer*>(layer)->Updated();
}
/*
* Treat canvas invalidations as animation activity for JS. Frequently
* invalidating a canvas will feed into heuristics and cause JIT code to be
* kept around longer, for smoother animations.
*/
nsCOMPtr<nsIGlobalObject> global =
do_QueryInterface(OwnerDoc()->GetInnerWindow());
if (global) {
if (JSObject *obj = global->GetGlobalJSObject()) {
js::NotifyAnimationActivity(obj);
}
}
}
void
HTMLCanvasElement::InvalidateCanvas()
{
// We don't need to flush anything here; if there's no frame or if
// we plan to reframe we don't need to invalidate it anyway.
nsIFrame *frame = GetPrimaryFrame();
if (!frame)
return;
frame->InvalidateFrame();
}
int32_t
HTMLCanvasElement::CountContexts()
{
if (mCurrentContext)
return 1;
return 0;
}
nsICanvasRenderingContextInternal *
HTMLCanvasElement::GetContextAtIndex(int32_t index)
{
if (mCurrentContext && index == 0)
return mCurrentContext;
return nullptr;
}
bool
HTMLCanvasElement::GetIsOpaque()
{
if (mCurrentContext) {
return mCurrentContext->GetIsOpaque();
}
return HasAttr(kNameSpaceID_None, nsGkAtoms::moz_opaque);
}
already_AddRefed<CanvasLayer>
HTMLCanvasElement::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
CanvasLayer *aOldLayer,
LayerManager *aManager)
{
if (!mCurrentContext)
return nullptr;
return mCurrentContext->GetCanvasLayer(aBuilder, aOldLayer, aManager);
}
bool
HTMLCanvasElement::ShouldForceInactiveLayer(LayerManager *aManager)
{
return !mCurrentContext || mCurrentContext->ShouldForceInactiveLayer(aManager);
}
void
HTMLCanvasElement::MarkContextClean()
{
if (!mCurrentContext)
return;
mCurrentContext->MarkContextClean();
}
TemporaryRef<SourceSurface>
HTMLCanvasElement::GetSurfaceSnapshot(bool* aPremultAlpha)
{
if (!mCurrentContext)
return nullptr;
return mCurrentContext->GetSurfaceSnapshot(aPremultAlpha);
}
} // namespace dom
} // namespace mozilla
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