[987e5d]: content / html / content / src / HTMLCanvasElement.cpp  Maximize  Restore  History

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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 "BasicLayers.h"
#include "imgIEncoder.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "mozilla/Base64.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/dom/CanvasRenderingContext2D.h"
#include "mozilla/dom/HTMLCanvasElementBinding.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsAsyncDOMEvent.h"
#include "nsAttrValueInlines.h"
#include "nsContentUtils.h"
#include "nsDisplayList.h"
#include "nsDOMFile.h"
#include "nsFrameManager.h"
#include "nsIScriptSecurityManager.h"
#include "nsITimer.h"
#include "nsIWritablePropertyBag2.h"
#include "nsIXPConnect.h"
#include "nsJSUtils.h"
#include "nsMathUtils.h"
#include "nsNetUtil.h"
#include "nsStreamUtils.h"
using namespace mozilla::layers;
NS_IMPL_NS_NEW_HTML_ELEMENT(Canvas)
namespace {
typedef mozilla::dom::HTMLImageElementOrHTMLCanvasElementOrHTMLVideoElement
HTMLImageOrCanvasOrVideoElement;
class ToBlobRunnable : public nsRunnable
{
public:
ToBlobRunnable(nsIFileCallback* aCallback,
nsIDOMBlob* aBlob)
: mCallback(aCallback),
mBlob(aBlob)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
}
NS_IMETHOD Run()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mCallback->Receive(mBlob);
return NS_OK;
}
private:
nsCOMPtr<nsIFileCallback> mCallback;
nsCOMPtr<nsIDOMBlob> mBlob;
};
} // anonymous namespace
namespace mozilla {
namespace dom {
class HTMLCanvasPrintState : public nsIDOMMozCanvasPrintState
{
public:
HTMLCanvasPrintState(HTMLCanvasElement* aCanvas,
nsICanvasRenderingContextInternal* aContext,
nsITimerCallback* aCallback)
: mIsDone(false), mPendingNotify(false), mCanvas(aCanvas),
mContext(aContext), mCallback(aCallback)
{
}
NS_IMETHOD GetContext(nsISupports** aContext)
{
NS_ADDREF(*aContext = mContext);
return NS_OK;
}
NS_IMETHOD 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;
}
}
return NS_OK;
}
void NotifyDone()
{
mIsDone = true;
mPendingNotify = false;
if (mCallback) {
mCallback->Notify(nullptr);
}
}
bool mIsDone;
// CC
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(HTMLCanvasPrintState)
private:
virtual ~HTMLCanvasPrintState()
{
}
bool mPendingNotify;
protected:
nsRefPtr<HTMLCanvasElement> mCanvas;
nsCOMPtr<nsICanvasRenderingContextInternal> mContext;
nsCOMPtr<nsITimerCallback> mCallback;
};
NS_IMPL_CYCLE_COLLECTING_ADDREF(HTMLCanvasPrintState)
NS_IMPL_CYCLE_COLLECTING_RELEASE(HTMLCanvasPrintState)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(HTMLCanvasPrintState)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIDOMMozCanvasPrintState)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(MozCanvasPrintState)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_3(HTMLCanvasPrintState, mCanvas, mContext, mCallback)
// ---------------------------------------------------------------------------
HTMLCanvasElement::HTMLCanvasElement(already_AddRefed<nsINodeInfo> aNodeInfo)
: nsGenericHTMLElement(aNodeInfo),
mWriteOnly(false)
{
SetIsDOMBinding();
}
HTMLCanvasElement::~HTMLCanvasElement()
{
ResetPrintCallback();
}
NS_IMPL_CYCLE_COLLECTION_INHERITED_4(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_HTML_CONTENT_INTERFACES(nsGenericHTMLElement)
NS_INTERFACE_TABLE_INHERITED2(HTMLCanvasElement,
nsIDOMHTMLCanvasElement,
nsICanvasElementExternal)
NS_INTERFACE_TABLE_TO_MAP_SEGUE
NS_ELEMENT_INTERFACE_MAP_END
NS_IMPL_ELEMENT_CLONE(HTMLCanvasElement)
/* virtual */ JSObject*
HTMLCanvasElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aScope)
{
return HTMLCanvasElementBinding::Wrap(aCx, aScope, 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();
}
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 &&
(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.
nsCOMPtr<nsIPrintCallback> printCallback;
if ((aType == nsPresContext::eContext_PageLayout ||
aType == nsPresContext::eContext_PrintPreview) &&
!mPrintState &&
NS_SUCCEEDED(GetMozPrintCallback(getter_AddRefs(printCallback))) && printCallback) {
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()
{
nsCOMPtr<nsIPrintCallback> printCallback;
GetMozPrintCallback(getter_AddRefs(printCallback));
printCallback->Render(mPrintState);
}
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;
}
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, const 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;
bool fellBackToPNG = false;
nsCOMPtr<nsIInputStream> inputData;
rv = ExtractData(aType, EmptyString(), getter_AddRefs(inputData), fellBackToPNG);
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);
}
NS_IMETHODIMP
HTMLCanvasElement::SetMozPrintCallback(nsIPrintCallback *aCallback)
{
mPrintCallback = aCallback;
return NS_OK;
}
nsIPrintCallback*
HTMLCanvasElement::GetMozPrintCallback() const
{
if (mOriginalCanvas) {
return mOriginalCanvas->GetMozPrintCallback();
}
return mPrintCallback;
}
NS_IMETHODIMP
HTMLCanvasElement::GetMozPrintCallback(nsIPrintCallback** aCallback)
{
NS_IF_ADDREF(*aCallback = GetMozPrintCallback());
return NS_OK;
}
nsresult
HTMLCanvasElement::ExtractData(const nsAString& aType,
const nsAString& aOptions,
nsIInputStream** aStream,
bool& aFellBackToPNG)
{
// note that if we don't have a current context, the spec says we're
// supposed to just return transparent black pixels of the canvas
// dimensions.
nsRefPtr<gfxImageSurface> emptyCanvas;
nsIntSize size = GetWidthHeight();
if (!mCurrentContext) {
emptyCanvas = new gfxImageSurface(gfxIntSize(size.width, size.height), gfxASurface::ImageFormatARGB32);
if (emptyCanvas->CairoStatus()) {
return NS_ERROR_INVALID_ARG;
}
}
nsresult rv;
// get image bytes
nsCOMPtr<nsIInputStream> imgStream;
NS_ConvertUTF16toUTF8 encoderType(aType);
try_again:
if (mCurrentContext) {
rv = mCurrentContext->GetInputStream(encoderType.get(),
nsPromiseFlatString(aOptions).get(),
getter_AddRefs(imgStream));
} else {
// no context, so we have to encode the empty image we created above
nsCString enccid("@mozilla.org/image/encoder;2?type=");
enccid += encoderType;
nsCOMPtr<imgIEncoder> encoder = do_CreateInstance(enccid.get(), &rv);
if (NS_SUCCEEDED(rv) && encoder) {
rv = encoder->InitFromData(emptyCanvas->Data(),
size.width * size.height * 4,
size.width,
size.height,
size.width * 4,
imgIEncoder::INPUT_FORMAT_HOSTARGB,
aOptions);
if (NS_SUCCEEDED(rv)) {
imgStream = do_QueryInterface(encoder);
}
} else {
rv = NS_ERROR_FAILURE;
}
}
if (NS_FAILED(rv) && !aFellBackToPNG) {
// Try image/png instead.
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
aFellBackToPNG = true;
encoderType.AssignLiteral("image/png");
goto try_again;
}
NS_ENSURE_SUCCESS(rv, rv);
imgStream.forget(aStream);
return NS_OK;
}
nsresult
HTMLCanvasElement::ToDataURLImpl(JSContext* aCx,
const nsAString& aMimeType,
const JS::Value& aEncoderOptions,
nsAString& aDataURL)
{
bool fallbackToPNG = false;
nsIntSize size = GetWidthHeight();
if (size.height == 0 || size.width == 0) {
aDataURL = NS_LITERAL_STRING("data:,");
return NS_OK;
}
nsAutoString type;
nsresult rv = nsContentUtils::ASCIIToLower(aMimeType, type);
if (NS_FAILED(rv)) {
return rv;
}
nsAutoString params;
// Quality parameter is only valid for the image/jpeg MIME type
if (type.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) {
params.AppendLiteral("quality=");
params.AppendInt(NS_lround(quality * 100.0));
}
}
}
// If we haven't parsed the params 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.
bool usingCustomParseOptions = false;
if (params.Length() == 0 && aEncoderOptions.isString()) {
NS_NAMED_LITERAL_STRING(mozParseOptions, "-moz-parse-options:");
nsDependentJSString 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());
params.Append(parseOptions);
usingCustomParseOptions = true;
}
}
nsCOMPtr<nsIInputStream> stream;
rv = ExtractData(type, params, getter_AddRefs(stream), fallbackToPNG);
// 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) {
fallbackToPNG = false;
rv = ExtractData(type, EmptyString(), getter_AddRefs(stream), fallbackToPNG);
}
NS_ENSURE_SUCCESS(rv, rv);
// build data URL string
if (fallbackToPNG)
aDataURL = NS_LITERAL_STRING("data:image/png;base64,");
else
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());
}
// XXXkhuey the encoding should be off the main thread, but we're lazy.
NS_IMETHODIMP
HTMLCanvasElement::ToBlob(nsIFileCallback* aCallback,
const nsAString& aType)
{
// do a trust check if this is a write-only canvas
if (mWriteOnly && !nsContentUtils::IsCallerChrome()) {
return NS_ERROR_DOM_SECURITY_ERR;
}
if (!aCallback) {
return NS_ERROR_UNEXPECTED;
}
nsAutoString type;
nsresult rv = nsContentUtils::ASCIIToLower(aType, type);
if (NS_FAILED(rv)) {
return rv;
}
bool fallbackToPNG = false;
nsCOMPtr<nsIInputStream> stream;
rv = ExtractData(type, EmptyString(), getter_AddRefs(stream), fallbackToPNG);
NS_ENSURE_SUCCESS(rv, rv);
if (fallbackToPNG) {
type.AssignLiteral("image/png");
}
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, imgSize);
NS_ENSURE_SUCCESS(rv, rv);
// The DOMFile takes ownership of the buffer
nsRefPtr<nsDOMMemoryFile> blob =
new nsDOMMemoryFile(imgData, imgSize, type);
JSContext* cx = nsContentUtils::GetCurrentJSContext();
if (cx) {
JS_updateMallocCounter(cx, imgSize);
}
nsRefPtr<ToBlobRunnable> runnable = new ToBlobRunnable(aCallback, blob);
return NS_DispatchToCurrentThread(runnable);
}
already_AddRefed<nsIDOMFile>
HTMLCanvasElement::MozGetAsFile(const nsAString& aName,
const nsAString& aType,
ErrorResult& aRv)
{
nsCOMPtr<nsIDOMFile> file;
aRv = MozGetAsFile(aName, aType, getter_AddRefs(file));
return file.forget();
}
NS_IMETHODIMP
HTMLCanvasElement::MozGetAsFile(const nsAString& aName,
const nsAString& aType,
nsIDOMFile** aResult)
{
// 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)
{
bool fallbackToPNG = false;
nsCOMPtr<nsIInputStream> stream;
nsresult rv = ExtractData(aType, EmptyString(), getter_AddRefs(stream),
fallbackToPNG);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoString type(aType);
if (fallbackToPNG) {
type.AssignLiteral("image/png");
}
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);
}
// The DOMFile takes ownership of the buffer
nsRefPtr<nsDOMMemoryFile> file =
new nsDOMMemoryFile(imgData, (uint32_t)imgSize, aName, type);
file.forget(aResult);
return NS_OK;
}
nsresult
HTMLCanvasElement::GetContextHelper(const nsAString& aContextId,
nsICanvasRenderingContextInternal **aContext)
{
NS_ENSURE_ARG(aContext);
if (aContextId.EqualsLiteral("2d")) {
Telemetry::Accumulate(Telemetry::CANVAS_2D_USED, 1);
nsRefPtr<CanvasRenderingContext2D> ctx =
new CanvasRenderingContext2D();
ctx->SetCanvasElement(this);
ctx.forget(aContext);
return NS_OK;
}
NS_ConvertUTF16toUTF8 ctxId(aContextId);
// check that ctxId is clamped to A-Za-z0-9_-
for (uint32_t i = 0; i < ctxId.Length(); i++) {
if ((ctxId[i] < 'A' || ctxId[i] > 'Z') &&
(ctxId[i] < 'a' || ctxId[i] > 'z') &&
(ctxId[i] < '0' || ctxId[i] > '9') &&
(ctxId[i] != '-') &&
(ctxId[i] != '_'))
{
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
return NS_OK;
}
}
nsCString ctxString("@mozilla.org/content/canvas-rendering-context;1?id=");
ctxString.Append(ctxId);
nsresult rv;
nsCOMPtr<nsICanvasRenderingContextInternal> ctx =
do_CreateInstance(ctxString.get(), &rv);
if (rv == NS_ERROR_OUT_OF_MEMORY) {
*aContext = nullptr;
return NS_ERROR_OUT_OF_MEMORY;
}
if (NS_FAILED(rv)) {
*aContext = nullptr;
// XXX ERRMSG we need to report an error to developers here! (bug 329026)
return NS_OK;
}
ctx->SetCanvasElement(this);
ctx.forget(aContext);
return NS_OK;
}
nsresult
HTMLCanvasElement::GetContext(const nsAString& aContextId,
nsISupports** aContext)
{
ErrorResult rv;
*aContext = GetContext(nullptr, aContextId, JS::NullHandleValue, rv).get();
return rv.ErrorCode();
}
already_AddRefed<nsISupports>
HTMLCanvasElement::GetContext(JSContext* aCx,
const nsAString& aContextId,
JS::Handle<JS::Value> aContextOptions,
ErrorResult& rv)
{
if (mCurrentContextId.IsEmpty()) {
rv = GetContextHelper(aContextId, getter_AddRefs(mCurrentContext));
if (rv.Failed() || !mCurrentContext) {
return nullptr;
}
// Ensure that the context participates in CC. Note that returning a
// CC participant from QI doesn't addref.
nsXPCOMCycleCollectionParticipant *cp = nullptr;
CallQueryInterface(mCurrentContext, &cp);
if (!cp) {
mCurrentContext = nullptr;
rv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
rv = UpdateContext(aCx, aContextOptions);
if (rv.Failed()) {
return nullptr;
}
mCurrentContextId.Assign(aContextId);
}
if (!mCurrentContextId.Equals(aContextId)) {
//XXX eventually allow for more than one active context on a given canvas
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.Equals(NS_LITERAL_STRING("2d")))
return NS_ERROR_INVALID_ARG;
if (mCurrentContextId.IsEmpty()) {
nsresult rv = GetContextHelper(aContextId, getter_AddRefs(mCurrentContext));
NS_ENSURE_SUCCESS(rv, rv);
if (!mCurrentContext) {
return NS_OK;
}
mCurrentContext->SetIsIPC(true);
rv = UpdateContext(nullptr, JS::NullHandleValue);
NS_ENSURE_SUCCESS(rv, rv);
mCurrentContextId.Assign(aContextId);
} else if (!mCurrentContextId.Equals(aContextId)) {
//XXX eventually allow for more than one active context on a given canvas
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(GetIsOpaque());
if (NS_FAILED(rv)) {
mCurrentContext = nullptr;
mCurrentContextId.Truncate();
return rv;
}
rv = mCurrentContext->SetContextOptions(aCx, aNewContextOptions);
if (NS_FAILED(rv)) {
mCurrentContext = nullptr;
mCurrentContextId.Truncate();
return rv;
}
rv = mCurrentContext->SetDimensions(sz.width, sz.height);
if (NS_FAILED(rv)) {
mCurrentContext = nullptr;
mCurrentContextId.Truncate();
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;
frame->MarkLayersActive(nsChangeHint(0));
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()
{
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();
}
NS_IMETHODIMP_(nsIntSize)
HTMLCanvasElement::GetSizeExternal()
{
return GetWidthHeight();
}
NS_IMETHODIMP
HTMLCanvasElement::RenderContextsExternal(gfxContext *aContext, gfxPattern::GraphicsFilter aFilter, uint32_t aFlags)
{
if (!mCurrentContext)
return NS_OK;
return mCurrentContext->Render(aContext, aFilter, aFlags);
}
} // namespace dom
} // namespace mozilla
DOMCI_DATA(MozCanvasPrintState, mozilla::dom::HTMLCanvasPrintState)

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