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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 "ImageDocument.h"
#include "mozilla/dom/ImageDocumentBinding.h"
#include "nsRect.h"
#include "nsIImageLoadingContent.h"
#include "nsGenericHTMLElement.h"
#include "nsIDocumentInlines.h"
#include "nsDOMTokenList.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIDOMEvent.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDOMMouseEvent.h"
#include "nsIDOMEventListener.h"
#include "nsGkAtoms.h"
#include "imgIRequest.h"
#include "imgILoader.h"
#include "imgIContainer.h"
#include "imgINotificationObserver.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsAutoPtr.h"
#include "nsStyleSet.h"
#include "nsIChannel.h"
#include "nsIContentPolicy.h"
#include "nsContentPolicyUtils.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMElement.h"
#include "nsIDOMHTMLElement.h"
#include "nsError.h"
#include "nsURILoader.h"
#include "nsIDocShell.h"
#include "nsIContentViewer.h"
#include "nsIMarkupDocumentViewer.h"
#include "nsThreadUtils.h"
#include "nsIScrollableFrame.h"
#include "nsContentUtils.h"
#include "mozilla/dom/Element.h"
#include "mozilla/Preferences.h"
#include <algorithm>
#define AUTOMATIC_IMAGE_RESIZING_PREF "browser.enable_automatic_image_resizing"
#define CLICK_IMAGE_RESIZING_PREF "browser.enable_click_image_resizing"
//XXX A hack needed for Firefox's site specific zoom.
#define SITE_SPECIFIC_ZOOM "browser.zoom.siteSpecific"
namespace mozilla {
namespace dom {
class ImageListener : public MediaDocumentStreamListener
{
public:
ImageListener(ImageDocument* aDocument);
virtual ~ImageListener();
/* nsIRequestObserver */
NS_IMETHOD OnStartRequest(nsIRequest* request, nsISupports *ctxt);
};
ImageListener::ImageListener(ImageDocument* aDocument)
: MediaDocumentStreamListener(aDocument)
{
}
ImageListener::~ImageListener()
{
}
NS_IMETHODIMP
ImageListener::OnStartRequest(nsIRequest* request, nsISupports *ctxt)
{
NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
ImageDocument *imgDoc = static_cast<ImageDocument*>(mDocument.get());
nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
if (!channel) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsPIDOMWindow> domWindow = imgDoc->GetWindow();
NS_ENSURE_TRUE(domWindow, NS_ERROR_UNEXPECTED);
// Do a ShouldProcess check to see whether to keep loading the image.
nsCOMPtr<nsIURI> channelURI;
channel->GetURI(getter_AddRefs(channelURI));
nsAutoCString mimeType;
channel->GetContentType(mimeType);
nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
nsCOMPtr<nsIPrincipal> channelPrincipal;
if (secMan) {
secMan->GetChannelPrincipal(channel, getter_AddRefs(channelPrincipal));
}
int16_t decision = nsIContentPolicy::ACCEPT;
nsresult rv = NS_CheckContentProcessPolicy(nsIContentPolicy::TYPE_IMAGE,
channelURI,
channelPrincipal,
domWindow->GetFrameElementInternal(),
mimeType,
nullptr,
&decision,
nsContentUtils::GetContentPolicy(),
secMan);
if (NS_FAILED(rv) || NS_CP_REJECTED(decision)) {
request->Cancel(NS_ERROR_CONTENT_BLOCKED);
return NS_OK;
}
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(imgDoc->mImageContent);
NS_ENSURE_TRUE(imageLoader, NS_ERROR_UNEXPECTED);
imageLoader->AddObserver(imgDoc);
imgDoc->mObservingImageLoader = true;
imageLoader->LoadImageWithChannel(channel, getter_AddRefs(mNextStream));
return MediaDocumentStreamListener::OnStartRequest(request, ctxt);
}
ImageDocument::ImageDocument()
: MediaDocument(),
mOriginalZoomLevel(1.0)
{
// NOTE! nsDocument::operator new() zeroes out all members, so don't
// bother initializing members to 0.
}
ImageDocument::~ImageDocument()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED_1(ImageDocument, MediaDocument,
mImageContent)
NS_IMPL_ADDREF_INHERITED(ImageDocument, MediaDocument)
NS_IMPL_RELEASE_INHERITED(ImageDocument, MediaDocument)
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(ImageDocument)
NS_INTERFACE_TABLE_INHERITED3(ImageDocument, nsIImageDocument,
imgINotificationObserver, nsIDOMEventListener)
NS_INTERFACE_TABLE_TAIL_INHERITING(MediaDocument)
nsresult
ImageDocument::Init()
{
nsresult rv = MediaDocument::Init();
NS_ENSURE_SUCCESS(rv, rv);
mResizeImageByDefault = Preferences::GetBool(AUTOMATIC_IMAGE_RESIZING_PREF);
mClickResizingEnabled = Preferences::GetBool(CLICK_IMAGE_RESIZING_PREF);
mShouldResize = mResizeImageByDefault;
mFirstResize = true;
return NS_OK;
}
JSObject*
ImageDocument::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aScope)
{
return ImageDocumentBinding::Wrap(aCx, aScope, this);
}
nsresult
ImageDocument::StartDocumentLoad(const char* aCommand,
nsIChannel* aChannel,
nsILoadGroup* aLoadGroup,
nsISupports* aContainer,
nsIStreamListener** aDocListener,
bool aReset,
nsIContentSink* aSink)
{
nsresult rv =
MediaDocument::StartDocumentLoad(aCommand, aChannel, aLoadGroup, aContainer,
aDocListener, aReset, aSink);
if (NS_FAILED(rv)) {
return rv;
}
mOriginalZoomLevel =
Preferences::GetBool(SITE_SPECIFIC_ZOOM, false) ? 1.0 : GetZoomLevel();
NS_ASSERTION(aDocListener, "null aDocListener");
*aDocListener = new ImageListener(this);
NS_ADDREF(*aDocListener);
return NS_OK;
}
void
ImageDocument::Destroy()
{
if (mImageContent) {
// Remove our event listener from the image content.
nsCOMPtr<EventTarget> target = do_QueryInterface(mImageContent);
target->RemoveEventListener(NS_LITERAL_STRING("click"), this, false);
// Break reference cycle with mImageContent, if we have one
if (mObservingImageLoader) {
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
if (imageLoader) {
imageLoader->RemoveObserver(this);
}
}
mImageContent = nullptr;
}
MediaDocument::Destroy();
}
void
ImageDocument::SetScriptGlobalObject(nsIScriptGlobalObject* aScriptGlobalObject)
{
// If the script global object is changing, we need to unhook our event
// listeners on the window.
nsCOMPtr<EventTarget> target;
if (mScriptGlobalObject &&
aScriptGlobalObject != mScriptGlobalObject) {
target = do_QueryInterface(mScriptGlobalObject);
target->RemoveEventListener(NS_LITERAL_STRING("resize"), this, false);
target->RemoveEventListener(NS_LITERAL_STRING("keypress"), this,
false);
}
// Set the script global object on the superclass before doing
// anything that might require it....
MediaDocument::SetScriptGlobalObject(aScriptGlobalObject);
if (aScriptGlobalObject) {
if (!GetRootElement()) {
// Create synthetic document
#ifdef DEBUG
nsresult rv =
#endif
CreateSyntheticDocument();
NS_ASSERTION(NS_SUCCEEDED(rv), "failed to create synthetic document");
target = do_QueryInterface(mImageContent);
target->AddEventListener(NS_LITERAL_STRING("click"), this, false);
}
target = do_QueryInterface(aScriptGlobalObject);
target->AddEventListener(NS_LITERAL_STRING("resize"), this, false);
target->AddEventListener(NS_LITERAL_STRING("keypress"), this, false);
if (GetReadyStateEnum() != nsIDocument::READYSTATE_COMPLETE) {
LinkStylesheet(NS_LITERAL_STRING("resource://gre/res/ImageDocument.css"));
if (!nsContentUtils::IsChildOfSameType(this)) {
LinkStylesheet(NS_LITERAL_STRING("resource://gre/res/TopLevelImageDocument.css"));
LinkStylesheet(NS_LITERAL_STRING("chrome://global/skin/media/TopLevelImageDocument.css"));
}
}
BecomeInteractive();
}
}
void
ImageDocument::OnPageShow(bool aPersisted,
EventTarget* aDispatchStartTarget)
{
if (aPersisted) {
mOriginalZoomLevel =
Preferences::GetBool(SITE_SPECIFIC_ZOOM, false) ? 1.0 : GetZoomLevel();
}
MediaDocument::OnPageShow(aPersisted, aDispatchStartTarget);
}
NS_IMETHODIMP
ImageDocument::GetImageResizingEnabled(bool* aImageResizingEnabled)
{
*aImageResizingEnabled = ImageResizingEnabled();
return NS_OK;
}
NS_IMETHODIMP
ImageDocument::GetImageIsOverflowing(bool* aImageIsOverflowing)
{
*aImageIsOverflowing = ImageIsOverflowing();
return NS_OK;
}
NS_IMETHODIMP
ImageDocument::GetImageIsResized(bool* aImageIsResized)
{
*aImageIsResized = ImageIsResized();
return NS_OK;
}
already_AddRefed<imgIRequest>
ImageDocument::GetImageRequest(ErrorResult& aRv)
{
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
nsCOMPtr<imgIRequest> imageRequest;
if (imageLoader) {
aRv = imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imageRequest));
}
return imageRequest.forget();
}
NS_IMETHODIMP
ImageDocument::GetImageRequest(imgIRequest** aImageRequest)
{
ErrorResult rv;
*aImageRequest = GetImageRequest(rv).get();
return rv.ErrorCode();
}
void
ImageDocument::ShrinkToFit()
{
if (!mImageContent) {
return;
}
if (GetZoomLevel() != mOriginalZoomLevel && mImageIsResized &&
!nsContentUtils::IsChildOfSameType(this)) {
return;
}
// Keep image content alive while changing the attributes.
nsCOMPtr<nsIContent> imageContent = mImageContent;
nsCOMPtr<nsIDOMHTMLImageElement> image = do_QueryInterface(mImageContent);
image->SetWidth(std::max(1, NSToCoordFloor(GetRatio() * mImageWidth)));
image->SetHeight(std::max(1, NSToCoordFloor(GetRatio() * mImageHeight)));
// The view might have been scrolled when zooming in, scroll back to the
// origin now that we're showing a shrunk-to-window version.
ScrollImageTo(0, 0, false);
SetModeClass(eShrinkToFit);
mImageIsResized = true;
UpdateTitleAndCharset();
}
NS_IMETHODIMP
ImageDocument::DOMShrinkToFit()
{
ShrinkToFit();
return NS_OK;
}
NS_IMETHODIMP
ImageDocument::DOMRestoreImageTo(int32_t aX, int32_t aY)
{
RestoreImageTo(aX, aY);
return NS_OK;
}
void
ImageDocument::ScrollImageTo(int32_t aX, int32_t aY, bool restoreImage)
{
float ratio = GetRatio();
if (restoreImage) {
RestoreImage();
FlushPendingNotifications(Flush_Layout);
}
nsIPresShell *shell = GetShell();
if (!shell)
return;
nsIScrollableFrame* sf = shell->GetRootScrollFrameAsScrollable();
if (!sf)
return;
nsRect portRect = sf->GetScrollPortRect();
sf->ScrollTo(nsPoint(nsPresContext::CSSPixelsToAppUnits(aX/ratio) - portRect.width/2,
nsPresContext::CSSPixelsToAppUnits(aY/ratio) - portRect.height/2),
nsIScrollableFrame::INSTANT);
}
void
ImageDocument::RestoreImage()
{
if (!mImageContent) {
return;
}
// Keep image content alive while changing the attributes.
nsCOMPtr<nsIContent> imageContent = mImageContent;
imageContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::width, true);
imageContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::height, true);
if (mImageIsOverflowing) {
SetModeClass(eOverflowing);
}
else {
SetModeClass(eNone);
}
mImageIsResized = false;
UpdateTitleAndCharset();
}
NS_IMETHODIMP
ImageDocument::DOMRestoreImage()
{
RestoreImage();
return NS_OK;
}
void
ImageDocument::ToggleImageSize()
{
mShouldResize = true;
if (mImageIsResized) {
mShouldResize = false;
ResetZoomLevel();
RestoreImage();
}
else if (mImageIsOverflowing) {
ResetZoomLevel();
ShrinkToFit();
}
}
NS_IMETHODIMP
ImageDocument::DOMToggleImageSize()
{
ToggleImageSize();
return NS_OK;
}
NS_IMETHODIMP
ImageDocument::Notify(imgIRequest* aRequest, int32_t aType, const nsIntRect* aData)
{
if (aType == imgINotificationObserver::SIZE_AVAILABLE) {
nsCOMPtr<imgIContainer> image;
aRequest->GetImage(getter_AddRefs(image));
return OnStartContainer(aRequest, image);
}
nsDOMTokenList* classList = mImageContent->AsElement()->GetClassList();
mozilla::ErrorResult rv;
if (aType == imgINotificationObserver::DECODE_COMPLETE) {
if (mImageContent) {
// Update the background-color of the image only after the
// image has been decoded to prevent flashes of just the
// background-color.
classList->Add(NS_LITERAL_STRING("decoded"), rv);
NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
}
}
if (aType == imgINotificationObserver::DISCARD) {
// mImageContent can be null if the document is already destroyed
if (mImageContent) {
// Remove any decoded-related styling when the image is unloaded.
classList->Remove(NS_LITERAL_STRING("decoded"), rv);
NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
}
}
if (aType == imgINotificationObserver::LOAD_COMPLETE) {
uint32_t reqStatus;
aRequest->GetImageStatus(&reqStatus);
nsresult status =
reqStatus & imgIRequest::STATUS_ERROR ? NS_ERROR_FAILURE : NS_OK;
return OnStopRequest(aRequest, status);
}
return NS_OK;
}
void
ImageDocument::SetModeClass(eModeClasses mode)
{
nsDOMTokenList* classList = mImageContent->AsElement()->GetClassList();
mozilla::ErrorResult rv;
if (mode == eShrinkToFit) {
classList->Add(NS_LITERAL_STRING("shrinkToFit"), rv);
} else {
classList->Remove(NS_LITERAL_STRING("shrinkToFit"), rv);
}
if (mode == eOverflowing) {
classList->Add(NS_LITERAL_STRING("overflowing"), rv);
} else {
classList->Remove(NS_LITERAL_STRING("overflowing"), rv);
}
}
nsresult
ImageDocument::OnStartContainer(imgIRequest* aRequest, imgIContainer* aImage)
{
aImage->GetWidth(&mImageWidth);
aImage->GetHeight(&mImageHeight);
nsCOMPtr<nsIRunnable> runnable =
NS_NewRunnableMethod(this, &ImageDocument::DefaultCheckOverflowing);
nsContentUtils::AddScriptRunner(runnable);
UpdateTitleAndCharset();
return NS_OK;
}
nsresult
ImageDocument::OnStopRequest(imgIRequest *aRequest,
nsresult aStatus)
{
UpdateTitleAndCharset();
// mImageContent can be null if the document is already destroyed
if (NS_FAILED(aStatus) && mStringBundle && mImageContent) {
nsAutoCString src;
mDocumentURI->GetSpec(src);
NS_ConvertUTF8toUTF16 srcString(src);
const PRUnichar* formatString[] = { srcString.get() };
nsXPIDLString errorMsg;
NS_NAMED_LITERAL_STRING(str, "InvalidImage");
mStringBundle->FormatStringFromName(str.get(), formatString, 1,
getter_Copies(errorMsg));
mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::alt, errorMsg, false);
}
return NS_OK;
}
NS_IMETHODIMP
ImageDocument::HandleEvent(nsIDOMEvent* aEvent)
{
nsAutoString eventType;
aEvent->GetType(eventType);
if (eventType.EqualsLiteral("resize")) {
CheckOverflowing(false);
}
else if (eventType.EqualsLiteral("click") && mClickResizingEnabled) {
ResetZoomLevel();
mShouldResize = true;
if (mImageIsResized) {
int32_t x = 0, y = 0;
nsCOMPtr<nsIDOMMouseEvent> event(do_QueryInterface(aEvent));
if (event) {
event->GetClientX(&x);
event->GetClientY(&y);
int32_t left = 0, top = 0;
nsCOMPtr<nsIDOMHTMLElement> htmlElement =
do_QueryInterface(mImageContent);
htmlElement->GetOffsetLeft(&left);
htmlElement->GetOffsetTop(&top);
x -= left;
y -= top;
}
mShouldResize = false;
RestoreImageTo(x, y);
}
else if (mImageIsOverflowing) {
ShrinkToFit();
}
}
return NS_OK;
}
nsresult
ImageDocument::CreateSyntheticDocument()
{
// Synthesize an html document that refers to the image
nsresult rv = MediaDocument::CreateSyntheticDocument();
NS_ENSURE_SUCCESS(rv, rv);
// Add the image element
Element* body = GetBodyElement();
if (!body) {
NS_WARNING("no body on image document!");
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsINodeInfo> nodeInfo;
nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::img, nullptr,
kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
mImageContent = NS_NewHTMLImageElement(nodeInfo.forget());
if (!mImageContent) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
NS_ENSURE_TRUE(imageLoader, NS_ERROR_UNEXPECTED);
nsAutoCString src;
mDocumentURI->GetSpec(src);
NS_ConvertUTF8toUTF16 srcString(src);
// Make sure not to start the image load from here...
imageLoader->SetLoadingEnabled(false);
mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::src, srcString, false);
mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::alt, srcString, false);
body->AppendChildTo(mImageContent, false);
imageLoader->SetLoadingEnabled(true);
return NS_OK;
}
nsresult
ImageDocument::CheckOverflowing(bool changeState)
{
/* Create a scope so that the style context gets destroyed before we might
* call RebuildStyleData. Also, holding onto pointers to the
* presentation through style resolution is potentially dangerous.
*/
{
nsIPresShell *shell = GetShell();
if (!shell) {
return NS_OK;
}
nsPresContext *context = shell->GetPresContext();
nsRect visibleArea = context->GetVisibleArea();
mVisibleWidth = nsPresContext::AppUnitsToFloatCSSPixels(visibleArea.width);
mVisibleHeight = nsPresContext::AppUnitsToFloatCSSPixels(visibleArea.height);
}
bool imageWasOverflowing = mImageIsOverflowing;
mImageIsOverflowing =
mImageWidth > mVisibleWidth || mImageHeight > mVisibleHeight;
bool windowBecameBigEnough = imageWasOverflowing && !mImageIsOverflowing;
if (changeState || mShouldResize || mFirstResize ||
windowBecameBigEnough) {
if (mImageIsOverflowing && (changeState || mShouldResize)) {
ShrinkToFit();
}
else if (mImageIsResized || mFirstResize || windowBecameBigEnough) {
RestoreImage();
}
}
mFirstResize = false;
return NS_OK;
}
void
ImageDocument::UpdateTitleAndCharset()
{
nsAutoCString typeStr;
nsCOMPtr<imgIRequest> imageRequest;
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
if (imageLoader) {
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imageRequest));
}
if (imageRequest) {
nsXPIDLCString mimeType;
imageRequest->GetMimeType(getter_Copies(mimeType));
ToUpperCase(mimeType);
nsXPIDLCString::const_iterator start, end;
mimeType.BeginReading(start);
mimeType.EndReading(end);
nsXPIDLCString::const_iterator iter = end;
if (FindInReadable(NS_LITERAL_CSTRING("IMAGE/"), start, iter) &&
iter != end) {
// strip out "X-" if any
if (*iter == 'X') {
++iter;
if (iter != end && *iter == '-') {
++iter;
if (iter == end) {
// looks like "IMAGE/X-" is the type?? Bail out of here.
mimeType.BeginReading(iter);
}
} else {
--iter;
}
}
typeStr = Substring(iter, end);
} else {
typeStr = mimeType;
}
}
nsXPIDLString status;
if (mImageIsResized) {
nsAutoString ratioStr;
ratioStr.AppendInt(NSToCoordFloor(GetRatio() * 100));
const PRUnichar* formatString[1] = { ratioStr.get() };
mStringBundle->FormatStringFromName(NS_LITERAL_STRING("ScaledImage").get(),
formatString, 1,
getter_Copies(status));
}
static const char* const formatNames[4] =
{
"ImageTitleWithNeitherDimensionsNorFile",
"ImageTitleWithoutDimensions",
"ImageTitleWithDimensions",
"ImageTitleWithDimensionsAndFile",
};
MediaDocument::UpdateTitleAndCharset(typeStr, formatNames,
mImageWidth, mImageHeight, status);
}
void
ImageDocument::ResetZoomLevel()
{
nsCOMPtr<nsIDocShell> docShell = do_QueryReferent(mDocumentContainer);
if (docShell) {
if (nsContentUtils::IsChildOfSameType(this)) {
return;
}
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(cv);
if (mdv) {
mdv->SetFullZoom(mOriginalZoomLevel);
}
}
}
float
ImageDocument::GetZoomLevel()
{
float zoomLevel = mOriginalZoomLevel;
nsCOMPtr<nsIDocShell> docShell = do_QueryReferent(mDocumentContainer);
if (docShell) {
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(cv);
if (mdv) {
mdv->GetFullZoom(&zoomLevel);
}
}
return zoomLevel;
}
} // namespace dom
} // namespace mozilla
DOMCI_DATA(ImageDocument, mozilla::dom::ImageDocument)
nsresult
NS_NewImageDocument(nsIDocument** aResult)
{
mozilla::dom::ImageDocument* doc = new mozilla::dom::ImageDocument();
NS_ADDREF(doc);
nsresult rv = doc->Init();
if (NS_FAILED(rv)) {
NS_RELEASE(doc);
}
*aResult = doc;
return rv;
}