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comparison: content/html/document/src/ImageDocument.cpp

content/html/document/src/ImageDocument.cpp

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #include "ImageDocument.h"
7 #include "mozilla/dom/ImageDocumentBinding.h"
8 #include "nsRect.h"
9 #include "nsIImageLoadingContent.h"
10 #include "nsGenericHTMLElement.h"
11 #include "nsDocShell.h"
12 #include "nsIDocumentInlines.h"
13 #include "nsDOMTokenList.h"
14 #include "nsIDOMHTMLImageElement.h"
15 #include "nsIDOMEvent.h"
16 #include "nsIDOMKeyEvent.h"
17 #include "nsIDOMMouseEvent.h"
18 #include "nsIDOMEventListener.h"
19 #include "nsIFrame.h"
20 #include "nsGkAtoms.h"
21 #include "imgIRequest.h"
22 #include "imgILoader.h"
23 #include "imgIContainer.h"
24 #include "imgINotificationObserver.h"
25 #include "nsIPresShell.h"
26 #include "nsPresContext.h"
27 #include "nsStyleContext.h"
28 #include "nsAutoPtr.h"
29 #include "nsStyleSet.h"
30 #include "nsIChannel.h"
31 #include "nsIContentPolicy.h"
32 #include "nsContentPolicyUtils.h"
33 #include "nsPIDOMWindow.h"
34 #include "nsIDOMElement.h"
35 #include "nsIDOMHTMLElement.h"
36 #include "nsError.h"
37 #include "nsURILoader.h"
38 #include "nsIDocShell.h"
39 #include "nsIContentViewer.h"
40 #include "nsIMarkupDocumentViewer.h"
41 #include "nsThreadUtils.h"
42 #include "nsIScrollableFrame.h"
43 #include "nsContentUtils.h"
44 #include "mozilla/dom/Element.h"
45 #include "mozilla/Preferences.h"
46 #include <algorithm>
47
48 #define AUTOMATIC_IMAGE_RESIZING_PREF "browser.enable_automatic_image_resizing"
49 #define CLICK_IMAGE_RESIZING_PREF "browser.enable_click_image_resizing"
50 //XXX A hack needed for Firefox's site specific zoom.
51 #define SITE_SPECIFIC_ZOOM "browser.zoom.siteSpecific"
52
53 namespace mozilla {
54 namespace dom {
55
56 class ImageListener : public MediaDocumentStreamListener
57 {
58 public:
59 NS_DECL_NSIREQUESTOBSERVER
60
61 ImageListener(ImageDocument* aDocument);
62 virtual ~ImageListener();
63 };
64
65 ImageListener::ImageListener(ImageDocument* aDocument)
66 : MediaDocumentStreamListener(aDocument)
67 {
68 }
69
70 ImageListener::~ImageListener()
71 {
72 }
73
74 NS_IMETHODIMP
75 ImageListener::OnStartRequest(nsIRequest* request, nsISupports *ctxt)
76 {
77 NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
78
79 ImageDocument *imgDoc = static_cast<ImageDocument*>(mDocument.get());
80 nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
81 if (!channel) {
82 return NS_ERROR_FAILURE;
83 }
84
85 nsCOMPtr<nsPIDOMWindow> domWindow = imgDoc->GetWindow();
86 NS_ENSURE_TRUE(domWindow, NS_ERROR_UNEXPECTED);
87
88 // Do a ShouldProcess check to see whether to keep loading the image.
89 nsCOMPtr<nsIURI> channelURI;
90 channel->GetURI(getter_AddRefs(channelURI));
91
92 nsAutoCString mimeType;
93 channel->GetContentType(mimeType);
94
95 nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
96 nsCOMPtr<nsIPrincipal> channelPrincipal;
97 if (secMan) {
98 secMan->GetChannelPrincipal(channel, getter_AddRefs(channelPrincipal));
99 }
100
101 int16_t decision = nsIContentPolicy::ACCEPT;
102 nsresult rv = NS_CheckContentProcessPolicy(nsIContentPolicy::TYPE_IMAGE,
103 channelURI,
104 channelPrincipal,
105 domWindow->GetFrameElementInternal(),
106 mimeType,
107 nullptr,
108 &decision,
109 nsContentUtils::GetContentPolicy(),
110 secMan);
111
112 if (NS_FAILED(rv) || NS_CP_REJECTED(decision)) {
113 request->Cancel(NS_ERROR_CONTENT_BLOCKED);
114 return NS_OK;
115 }
116
117 nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(imgDoc->mImageContent);
118 NS_ENSURE_TRUE(imageLoader, NS_ERROR_UNEXPECTED);
119
120 imageLoader->AddObserver(imgDoc);
121 imgDoc->mObservingImageLoader = true;
122 imageLoader->LoadImageWithChannel(channel, getter_AddRefs(mNextStream));
123
124 return MediaDocumentStreamListener::OnStartRequest(request, ctxt);
125 }
126
127 NS_IMETHODIMP
128 ImageListener::OnStopRequest(nsIRequest* aRequest, nsISupports* aCtxt, nsresult aStatus)
129 {
130 ImageDocument* imgDoc = static_cast<ImageDocument*>(mDocument.get());
131 nsContentUtils::DispatchChromeEvent(imgDoc, static_cast<nsIDocument*>(imgDoc),
132 NS_LITERAL_STRING("ImageContentLoaded"),
133 true, true);
134 return MediaDocumentStreamListener::OnStopRequest(aRequest, aCtxt, aStatus);
135 }
136
137 ImageDocument::ImageDocument()
138 : MediaDocument(),
139 mOriginalZoomLevel(1.0)
140 {
141 // NOTE! nsDocument::operator new() zeroes out all members, so don't
142 // bother initializing members to 0.
143 }
144
145 ImageDocument::~ImageDocument()
146 {
147 }
148
149
150 NS_IMPL_CYCLE_COLLECTION_INHERITED(ImageDocument, MediaDocument,
151 mImageContent)
152
153 NS_IMPL_ADDREF_INHERITED(ImageDocument, MediaDocument)
154 NS_IMPL_RELEASE_INHERITED(ImageDocument, MediaDocument)
155
156 NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(ImageDocument)
157 NS_INTERFACE_TABLE_INHERITED(ImageDocument, nsIImageDocument,
158 imgINotificationObserver, nsIDOMEventListener)
159 NS_INTERFACE_TABLE_TAIL_INHERITING(MediaDocument)
160
161
162 nsresult
163 ImageDocument::Init()
164 {
165 nsresult rv = MediaDocument::Init();
166 NS_ENSURE_SUCCESS(rv, rv);
167
168 mResizeImageByDefault = Preferences::GetBool(AUTOMATIC_IMAGE_RESIZING_PREF);
169 mClickResizingEnabled = Preferences::GetBool(CLICK_IMAGE_RESIZING_PREF);
170 mShouldResize = mResizeImageByDefault;
171 mFirstResize = true;
172
173 return NS_OK;
174 }
175
176 JSObject*
177 ImageDocument::WrapNode(JSContext* aCx)
178 {
179 return ImageDocumentBinding::Wrap(aCx, this);
180 }
181
182 nsresult
183 ImageDocument::StartDocumentLoad(const char* aCommand,
184 nsIChannel* aChannel,
185 nsILoadGroup* aLoadGroup,
186 nsISupports* aContainer,
187 nsIStreamListener** aDocListener,
188 bool aReset,
189 nsIContentSink* aSink)
190 {
191 nsresult rv =
192 MediaDocument::StartDocumentLoad(aCommand, aChannel, aLoadGroup, aContainer,
193 aDocListener, aReset, aSink);
194 if (NS_FAILED(rv)) {
195 return rv;
196 }
197
198 mOriginalZoomLevel =
199 Preferences::GetBool(SITE_SPECIFIC_ZOOM, false) ? 1.0 : GetZoomLevel();
200
201 NS_ASSERTION(aDocListener, "null aDocListener");
202 *aDocListener = new ImageListener(this);
203 NS_ADDREF(*aDocListener);
204
205 return NS_OK;
206 }
207
208 void
209 ImageDocument::Destroy()
210 {
211 if (mImageContent) {
212 // Remove our event listener from the image content.
213 nsCOMPtr<EventTarget> target = do_QueryInterface(mImageContent);
214 target->RemoveEventListener(NS_LITERAL_STRING("load"), this, false);
215 target->RemoveEventListener(NS_LITERAL_STRING("click"), this, false);
216
217 // Break reference cycle with mImageContent, if we have one
218 if (mObservingImageLoader) {
219 nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
220 if (imageLoader) {
221 imageLoader->RemoveObserver(this);
222 }
223 }
224
225 mImageContent = nullptr;
226 }
227
228 MediaDocument::Destroy();
229 }
230
231 void
232 ImageDocument::SetScriptGlobalObject(nsIScriptGlobalObject* aScriptGlobalObject)
233 {
234 // If the script global object is changing, we need to unhook our event
235 // listeners on the window.
236 nsCOMPtr<EventTarget> target;
237 if (mScriptGlobalObject &&
238 aScriptGlobalObject != mScriptGlobalObject) {
239 target = do_QueryInterface(mScriptGlobalObject);
240 target->RemoveEventListener(NS_LITERAL_STRING("resize"), this, false);
241 target->RemoveEventListener(NS_LITERAL_STRING("keypress"), this,
242 false);
243 }
244
245 // Set the script global object on the superclass before doing
246 // anything that might require it....
247 MediaDocument::SetScriptGlobalObject(aScriptGlobalObject);
248
249 if (aScriptGlobalObject) {
250 if (!GetRootElement()) {
251 // Create synthetic document
252 #ifdef DEBUG
253 nsresult rv =
254 #endif
255 CreateSyntheticDocument();
256 NS_ASSERTION(NS_SUCCEEDED(rv), "failed to create synthetic document");
257
258 target = do_QueryInterface(mImageContent);
259 target->AddEventListener(NS_LITERAL_STRING("load"), this, false);
260 target->AddEventListener(NS_LITERAL_STRING("click"), this, false);
261 }
262
263 target = do_QueryInterface(aScriptGlobalObject);
264 target->AddEventListener(NS_LITERAL_STRING("resize"), this, false);
265 target->AddEventListener(NS_LITERAL_STRING("keypress"), this, false);
266
267 if (GetReadyStateEnum() != nsIDocument::READYSTATE_COMPLETE) {
268 LinkStylesheet(NS_LITERAL_STRING("resource://gre/res/ImageDocument.css"));
269 if (!nsContentUtils::IsChildOfSameType(this)) {
270 LinkStylesheet(NS_LITERAL_STRING("resource://gre/res/TopLevelImageDocument.css"));
271 LinkStylesheet(NS_LITERAL_STRING("chrome://global/skin/media/TopLevelImageDocument.css"));
272 }
273 }
274 BecomeInteractive();
275 }
276 }
277
278 void
279 ImageDocument::OnPageShow(bool aPersisted,
280 EventTarget* aDispatchStartTarget)
281 {
282 if (aPersisted) {
283 mOriginalZoomLevel =
284 Preferences::GetBool(SITE_SPECIFIC_ZOOM, false) ? 1.0 : GetZoomLevel();
285 }
286 MediaDocument::OnPageShow(aPersisted, aDispatchStartTarget);
287 }
288
289 NS_IMETHODIMP
290 ImageDocument::GetImageResizingEnabled(bool* aImageResizingEnabled)
291 {
292 *aImageResizingEnabled = ImageResizingEnabled();
293 return NS_OK;
294 }
295
296 NS_IMETHODIMP
297 ImageDocument::GetImageIsOverflowing(bool* aImageIsOverflowing)
298 {
299 *aImageIsOverflowing = ImageIsOverflowing();
300 return NS_OK;
301 }
302
303 NS_IMETHODIMP
304 ImageDocument::GetImageIsResized(bool* aImageIsResized)
305 {
306 *aImageIsResized = ImageIsResized();
307 return NS_OK;
308 }
309
310 already_AddRefed<imgIRequest>
311 ImageDocument::GetImageRequest(ErrorResult& aRv)
312 {
313 nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
314 nsCOMPtr<imgIRequest> imageRequest;
315 if (imageLoader) {
316 aRv = imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
317 getter_AddRefs(imageRequest));
318 }
319 return imageRequest.forget();
320 }
321
322 NS_IMETHODIMP
323 ImageDocument::GetImageRequest(imgIRequest** aImageRequest)
324 {
325 ErrorResult rv;
326 *aImageRequest = GetImageRequest(rv).take();
327 return rv.ErrorCode();
328 }
329
330 void
331 ImageDocument::ShrinkToFit()
332 {
333 if (!mImageContent) {
334 return;
335 }
336 if (GetZoomLevel() != mOriginalZoomLevel && mImageIsResized &&
337 !nsContentUtils::IsChildOfSameType(this)) {
338 return;
339 }
340
341 // Keep image content alive while changing the attributes.
342 nsCOMPtr<nsIContent> imageContent = mImageContent;
343 nsCOMPtr<nsIDOMHTMLImageElement> image = do_QueryInterface(mImageContent);
344 image->SetWidth(std::max(1, NSToCoordFloor(GetRatio() * mImageWidth)));
345 image->SetHeight(std::max(1, NSToCoordFloor(GetRatio() * mImageHeight)));
346
347 // The view might have been scrolled when zooming in, scroll back to the
348 // origin now that we're showing a shrunk-to-window version.
349 ScrollImageTo(0, 0, false);
350
351 if (!mImageContent) {
352 // ScrollImageTo flush destroyed our content.
353 return;
354 }
355
356 SetModeClass(eShrinkToFit);
357
358 mImageIsResized = true;
359
360 UpdateTitleAndCharset();
361 }
362
363 NS_IMETHODIMP
364 ImageDocument::DOMShrinkToFit()
365 {
366 ShrinkToFit();
367 return NS_OK;
368 }
369
370 NS_IMETHODIMP
371 ImageDocument::DOMRestoreImageTo(int32_t aX, int32_t aY)
372 {
373 RestoreImageTo(aX, aY);
374 return NS_OK;
375 }
376
377 void
378 ImageDocument::ScrollImageTo(int32_t aX, int32_t aY, bool restoreImage)
379 {
380 float ratio = GetRatio();
381
382 if (restoreImage) {
383 RestoreImage();
384 FlushPendingNotifications(Flush_Layout);
385 }
386
387 nsCOMPtr<nsIPresShell> shell = GetShell();
388 if (!shell)
389 return;
390
391 nsIScrollableFrame* sf = shell->GetRootScrollFrameAsScrollable();
392 if (!sf)
393 return;
394
395 nsRect portRect = sf->GetScrollPortRect();
396 sf->ScrollTo(nsPoint(nsPresContext::CSSPixelsToAppUnits(aX/ratio) - portRect.width/2,
397 nsPresContext::CSSPixelsToAppUnits(aY/ratio) - portRect.height/2),
398 nsIScrollableFrame::INSTANT);
399 }
400
401 void
402 ImageDocument::RestoreImage()
403 {
404 if (!mImageContent) {
405 return;
406 }
407 // Keep image content alive while changing the attributes.
408 nsCOMPtr<nsIContent> imageContent = mImageContent;
409 imageContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::width, true);
410 imageContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::height, true);
411
412 if (mImageIsOverflowing) {
413 SetModeClass(eOverflowing);
414 }
415 else {
416 SetModeClass(eNone);
417 }
418
419 mImageIsResized = false;
420
421 UpdateTitleAndCharset();
422 }
423
424 NS_IMETHODIMP
425 ImageDocument::DOMRestoreImage()
426 {
427 RestoreImage();
428 return NS_OK;
429 }
430
431 void
432 ImageDocument::ToggleImageSize()
433 {
434 mShouldResize = true;
435 if (mImageIsResized) {
436 mShouldResize = false;
437 ResetZoomLevel();
438 RestoreImage();
439 }
440 else if (mImageIsOverflowing) {
441 ResetZoomLevel();
442 ShrinkToFit();
443 }
444 }
445
446 NS_IMETHODIMP
447 ImageDocument::DOMToggleImageSize()
448 {
449 ToggleImageSize();
450 return NS_OK;
451 }
452
453 NS_IMETHODIMP
454 ImageDocument::Notify(imgIRequest* aRequest, int32_t aType, const nsIntRect* aData)
455 {
456 if (aType == imgINotificationObserver::SIZE_AVAILABLE) {
457 nsCOMPtr<imgIContainer> image;
458 aRequest->GetImage(getter_AddRefs(image));
459 return OnStartContainer(aRequest, image);
460 }
461
462 nsDOMTokenList* classList = mImageContent->AsElement()->GetClassList();
463 mozilla::ErrorResult rv;
464 if (aType == imgINotificationObserver::DECODE_COMPLETE) {
465 if (mImageContent && !nsContentUtils::IsChildOfSameType(this)) {
466 // Update the background-color of the image only after the
467 // image has been decoded to prevent flashes of just the
468 // background-color.
469 classList->Add(NS_LITERAL_STRING("decoded"), rv);
470 NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
471 }
472 }
473
474 if (aType == imgINotificationObserver::DISCARD) {
475 // mImageContent can be null if the document is already destroyed
476 if (mImageContent && !nsContentUtils::IsChildOfSameType(this)) {
477 // Remove any decoded-related styling when the image is unloaded.
478 classList->Remove(NS_LITERAL_STRING("decoded"), rv);
479 NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
480 }
481 }
482
483 if (aType == imgINotificationObserver::LOAD_COMPLETE) {
484 uint32_t reqStatus;
485 aRequest->GetImageStatus(&reqStatus);
486 nsresult status =
487 reqStatus & imgIRequest::STATUS_ERROR ? NS_ERROR_FAILURE : NS_OK;
488 return OnStopRequest(aRequest, status);
489 }
490
491 return NS_OK;
492 }
493
494 void
495 ImageDocument::SetModeClass(eModeClasses mode)
496 {
497 nsDOMTokenList* classList = mImageContent->AsElement()->GetClassList();
498 mozilla::ErrorResult rv;
499
500 if (mode == eShrinkToFit) {
501 classList->Add(NS_LITERAL_STRING("shrinkToFit"), rv);
502 } else {
503 classList->Remove(NS_LITERAL_STRING("shrinkToFit"), rv);
504 }
505
506 if (mode == eOverflowing) {
507 classList->Add(NS_LITERAL_STRING("overflowing"), rv);
508 } else {
509 classList->Remove(NS_LITERAL_STRING("overflowing"), rv);
510 }
511 }
512
513 nsresult
514 ImageDocument::OnStartContainer(imgIRequest* aRequest, imgIContainer* aImage)
515 {
516 // Styles have not yet been applied, so we don't know the final size. For now,
517 // default to the image's intrinsic size.
518 aImage->GetWidth(&mImageWidth);
519 aImage->GetHeight(&mImageHeight);
520
521 nsCOMPtr<nsIRunnable> runnable =
522 NS_NewRunnableMethod(this, &ImageDocument::DefaultCheckOverflowing);
523 nsContentUtils::AddScriptRunner(runnable);
524 UpdateTitleAndCharset();
525
526 return NS_OK;
527 }
528
529 nsresult
530 ImageDocument::OnStopRequest(imgIRequest *aRequest,
531 nsresult aStatus)
532 {
533 UpdateTitleAndCharset();
534
535 // mImageContent can be null if the document is already destroyed
536 if (NS_FAILED(aStatus) && mStringBundle && mImageContent) {
537 nsAutoCString src;
538 mDocumentURI->GetSpec(src);
539 NS_ConvertUTF8toUTF16 srcString(src);
540 const char16_t* formatString[] = { srcString.get() };
541 nsXPIDLString errorMsg;
542 NS_NAMED_LITERAL_STRING(str, "InvalidImage");
543 mStringBundle->FormatStringFromName(str.get(), formatString, 1,
544 getter_Copies(errorMsg));
545
546 mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::alt, errorMsg, false);
547 }
548
549 return NS_OK;
550 }
551
552 NS_IMETHODIMP
553 ImageDocument::HandleEvent(nsIDOMEvent* aEvent)
554 {
555 nsAutoString eventType;
556 aEvent->GetType(eventType);
557 if (eventType.EqualsLiteral("resize")) {
558 CheckOverflowing(false);
559 }
560 else if (eventType.EqualsLiteral("click") && mClickResizingEnabled) {
561 ResetZoomLevel();
562 mShouldResize = true;
563 if (mImageIsResized) {
564 int32_t x = 0, y = 0;
565 nsCOMPtr<nsIDOMMouseEvent> event(do_QueryInterface(aEvent));
566 if (event) {
567 event->GetClientX(&x);
568 event->GetClientY(&y);
569 int32_t left = 0, top = 0;
570 nsCOMPtr<nsIDOMHTMLElement> htmlElement =
571 do_QueryInterface(mImageContent);
572 htmlElement->GetOffsetLeft(&left);
573 htmlElement->GetOffsetTop(&top);
574 x -= left;
575 y -= top;
576 }
577 mShouldResize = false;
578 RestoreImageTo(x, y);
579 }
580 else if (mImageIsOverflowing) {
581 ShrinkToFit();
582 }
583 } else if (eventType.EqualsLiteral("load")) {
584 UpdateSizeFromLayout();
585 }
586
587 return NS_OK;
588 }
589
590 void
591 ImageDocument::UpdateSizeFromLayout()
592 {
593 // Pull an updated size from the content frame to account for any size
594 // change due to CSS properties like |image-orientation|.
595 Element* contentElement = mImageContent->AsElement();
596 if (!contentElement) {
597 return;
598 }
599
600 nsIFrame* contentFrame = contentElement->GetPrimaryFrame(Flush_Frames);
601 if (!contentFrame) {
602 return;
603 }
604
605 nsIntSize oldSize(mImageWidth, mImageHeight);
606 IntrinsicSize newSize = contentFrame->GetIntrinsicSize();
607
608 if (newSize.width.GetUnit() == eStyleUnit_Coord) {
609 mImageWidth = nsPresContext::AppUnitsToFloatCSSPixels(newSize.width.GetCoordValue());
610 }
611 if (newSize.height.GetUnit() == eStyleUnit_Coord) {
612 mImageHeight = nsPresContext::AppUnitsToFloatCSSPixels(newSize.height.GetCoordValue());
613 }
614
615 // Ensure that our information about overflow is up-to-date if needed.
616 if (mImageWidth != oldSize.width || mImageHeight != oldSize.height) {
617 CheckOverflowing(false);
618 }
619 }
620
621 nsresult
622 ImageDocument::CreateSyntheticDocument()
623 {
624 // Synthesize an html document that refers to the image
625 nsresult rv = MediaDocument::CreateSyntheticDocument();
626 NS_ENSURE_SUCCESS(rv, rv);
627
628 // Add the image element
629 Element* body = GetBodyElement();
630 if (!body) {
631 NS_WARNING("no body on image document!");
632 return NS_ERROR_FAILURE;
633 }
634
635 nsCOMPtr<nsINodeInfo> nodeInfo;
636 nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::img, nullptr,
637 kNameSpaceID_XHTML,
638 nsIDOMNode::ELEMENT_NODE);
639
640 mImageContent = NS_NewHTMLImageElement(nodeInfo.forget());
641 if (!mImageContent) {
642 return NS_ERROR_OUT_OF_MEMORY;
643 }
644 nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
645 NS_ENSURE_TRUE(imageLoader, NS_ERROR_UNEXPECTED);
646
647 nsAutoCString src;
648 mDocumentURI->GetSpec(src);
649
650 NS_ConvertUTF8toUTF16 srcString(src);
651 // Make sure not to start the image load from here...
652 imageLoader->SetLoadingEnabled(false);
653 mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::src, srcString, false);
654 mImageContent->SetAttr(kNameSpaceID_None, nsGkAtoms::alt, srcString, false);
655
656 body->AppendChildTo(mImageContent, false);
657 imageLoader->SetLoadingEnabled(true);
658
659 return NS_OK;
660 }
661
662 nsresult
663 ImageDocument::CheckOverflowing(bool changeState)
664 {
665 /* Create a scope so that the style context gets destroyed before we might
666 * call RebuildStyleData. Also, holding onto pointers to the
667 * presentation through style resolution is potentially dangerous.
668 */
669 {
670 nsIPresShell *shell = GetShell();
671 if (!shell) {
672 return NS_OK;
673 }
674
675 nsPresContext *context = shell->GetPresContext();
676 nsRect visibleArea = context->GetVisibleArea();
677
678 mVisibleWidth = nsPresContext::AppUnitsToFloatCSSPixels(visibleArea.width);
679 mVisibleHeight = nsPresContext::AppUnitsToFloatCSSPixels(visibleArea.height);
680 }
681
682 bool imageWasOverflowing = mImageIsOverflowing;
683 mImageIsOverflowing =
684 mImageWidth > mVisibleWidth || mImageHeight > mVisibleHeight;
685 bool windowBecameBigEnough = imageWasOverflowing && !mImageIsOverflowing;
686
687 if (changeState || mShouldResize || mFirstResize ||
688 windowBecameBigEnough) {
689 if (mImageIsOverflowing && (changeState || mShouldResize)) {
690 ShrinkToFit();
691 }
692 else if (mImageIsResized || mFirstResize || windowBecameBigEnough) {
693 RestoreImage();
694 }
695 }
696 mFirstResize = false;
697
698 return NS_OK;
699 }
700
701 void
702 ImageDocument::UpdateTitleAndCharset()
703 {
704 nsAutoCString typeStr;
705 nsCOMPtr<imgIRequest> imageRequest;
706 nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mImageContent);
707 if (imageLoader) {
708 imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
709 getter_AddRefs(imageRequest));
710 }
711
712 if (imageRequest) {
713 nsXPIDLCString mimeType;
714 imageRequest->GetMimeType(getter_Copies(mimeType));
715 ToUpperCase(mimeType);
716 nsXPIDLCString::const_iterator start, end;
717 mimeType.BeginReading(start);
718 mimeType.EndReading(end);
719 nsXPIDLCString::const_iterator iter = end;
720 if (FindInReadable(NS_LITERAL_CSTRING("IMAGE/"), start, iter) &&
721 iter != end) {
722 // strip out "X-" if any
723 if (*iter == 'X') {
724 ++iter;
725 if (iter != end && *iter == '-') {
726 ++iter;
727 if (iter == end) {
728 // looks like "IMAGE/X-" is the type?? Bail out of here.
729 mimeType.BeginReading(iter);
730 }
731 } else {
732 --iter;
733 }
734 }
735 typeStr = Substring(iter, end);
736 } else {
737 typeStr = mimeType;
738 }
739 }
740
741 nsXPIDLString status;
742 if (mImageIsResized) {
743 nsAutoString ratioStr;
744 ratioStr.AppendInt(NSToCoordFloor(GetRatio() * 100));
745
746 const char16_t* formatString[1] = { ratioStr.get() };
747 mStringBundle->FormatStringFromName(MOZ_UTF16("ScaledImage"),
748 formatString, 1,
749 getter_Copies(status));
750 }
751
752 static const char* const formatNames[4] =
753 {
754 "ImageTitleWithNeitherDimensionsNorFile",
755 "ImageTitleWithoutDimensions",
756 "ImageTitleWithDimensions2",
757 "ImageTitleWithDimensions2AndFile",
758 };
759
760 MediaDocument::UpdateTitleAndCharset(typeStr, formatNames,
761 mImageWidth, mImageHeight, status);
762 }
763
764 void
765 ImageDocument::ResetZoomLevel()
766 {
767 nsCOMPtr<nsIDocShell> docShell(mDocumentContainer);
768 if (docShell) {
769 if (nsContentUtils::IsChildOfSameType(this)) {
770 return;
771 }
772
773 nsCOMPtr<nsIContentViewer> cv;
774 docShell->GetContentViewer(getter_AddRefs(cv));
775 nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(cv);
776 if (mdv) {
777 mdv->SetFullZoom(mOriginalZoomLevel);
778 }
779 }
780 }
781
782 float
783 ImageDocument::GetZoomLevel()
784 {
785 float zoomLevel = mOriginalZoomLevel;
786 nsCOMPtr<nsIDocShell> docShell(mDocumentContainer);
787 if (docShell) {
788 nsCOMPtr<nsIContentViewer> cv;
789 docShell->GetContentViewer(getter_AddRefs(cv));
790 nsCOMPtr<nsIMarkupDocumentViewer> mdv = do_QueryInterface(cv);
791 if (mdv) {
792 mdv->GetFullZoom(&zoomLevel);
793 }
794 }
795 return zoomLevel;
796 }
797
798 } // namespace dom
799 } // namespace mozilla
800
801 nsresult
802 NS_NewImageDocument(nsIDocument** aResult)
803 {
804 mozilla::dom::ImageDocument* doc = new mozilla::dom::ImageDocument();
805 NS_ADDREF(doc);
806
807 nsresult rv = doc->Init();
808 if (NS_FAILED(rv)) {
809 NS_RELEASE(doc);
810 }
811
812 *aResult = doc;
813
814 return rv;
815 }

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