LCOV - code coverage report
Current view: directory - layout/base - nsImageLoader.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 91 0 0.0 %
Date: 2012-06-02 Functions: 16 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is mozilla.org code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Netscape Communications Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *   Stuart Parmenter <pavlov@netscape.com>
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : /* class to notify frames of background image loads */
      41                 : 
      42                 : #include "nsImageLoader.h"
      43                 : 
      44                 : #include "imgILoader.h"
      45                 : 
      46                 : #include "nsIURI.h"
      47                 : #include "nsILoadGroup.h"
      48                 : #include "nsNetUtil.h"
      49                 : 
      50                 : #include "nsPresContext.h"
      51                 : #include "nsIPresShell.h"
      52                 : #include "nsIFrame.h"
      53                 : #include "nsIContent.h"
      54                 : #include "nsIDocument.h"
      55                 : 
      56                 : #include "imgIContainer.h"
      57                 : 
      58                 : #include "nsStyleContext.h"
      59                 : #include "nsGkAtoms.h"
      60                 : #include "nsLayoutUtils.h"
      61                 : 
      62                 : // Paint forcing
      63                 : #include "prenv.h"
      64                 : 
      65               0 : NS_IMPL_ISUPPORTS2(nsImageLoader, imgIDecoderObserver, imgIContainerObserver)
      66                 : 
      67               0 : nsImageLoader::nsImageLoader(nsIFrame *aFrame, PRUint32 aActions,
      68                 :                              nsImageLoader *aNextLoader)
      69                 :   : mFrame(aFrame),
      70                 :     mActions(aActions),
      71                 :     mNextLoader(aNextLoader),
      72               0 :     mRequestRegistered(false)
      73                 : {
      74               0 : }
      75                 : 
      76               0 : nsImageLoader::~nsImageLoader()
      77                 : {
      78               0 :   Destroy();
      79               0 : }
      80                 : 
      81                 : /* static */ already_AddRefed<nsImageLoader>
      82               0 : nsImageLoader::Create(nsIFrame *aFrame, imgIRequest *aRequest, 
      83                 :                       PRUint32 aActions, nsImageLoader *aNextLoader)
      84                 : {
      85                 :   nsRefPtr<nsImageLoader> loader =
      86               0 :     new nsImageLoader(aFrame, aActions, aNextLoader);
      87                 : 
      88               0 :   loader->Load(aRequest);
      89                 : 
      90               0 :   return loader.forget();
      91                 : }
      92                 : 
      93                 : void
      94               0 : nsImageLoader::Destroy()
      95                 : {
      96                 :   // Destroy the chain with only one level of recursion.
      97               0 :   nsRefPtr<nsImageLoader> list = mNextLoader;
      98               0 :   mNextLoader = nsnull;
      99               0 :   while (list) {
     100               0 :     nsRefPtr<nsImageLoader> todestroy = list;
     101               0 :     list = todestroy->mNextLoader;
     102               0 :     todestroy->mNextLoader = nsnull;
     103               0 :     todestroy->Destroy();
     104                 :   }
     105                 : 
     106               0 :   if (mRequest && mFrame) {
     107                 :     nsLayoutUtils::DeregisterImageRequest(mFrame->PresContext(), mRequest,
     108               0 :                                           &mRequestRegistered);
     109                 :   }
     110                 : 
     111               0 :   mFrame = nsnull;
     112                 : 
     113               0 :   if (mRequest) {
     114               0 :     mRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
     115                 :   }
     116                 : 
     117               0 :   mRequest = nsnull;
     118               0 : }
     119                 : 
     120                 : nsresult
     121               0 : nsImageLoader::Load(imgIRequest *aImage)
     122                 : {
     123               0 :   NS_ASSERTION(!mRequest, "can't reuse image loaders");
     124               0 :   NS_ASSERTION(mFrame, "not initialized");
     125               0 :   NS_ASSERTION(aImage, "must have non-null image");
     126                 : 
     127               0 :   if (!mFrame)
     128               0 :     return NS_ERROR_NOT_INITIALIZED;
     129                 : 
     130               0 :   if (!aImage)
     131               0 :     return NS_ERROR_FAILURE;
     132                 : 
     133                 :   // Deregister mRequest from the refresh driver, since it is no longer
     134                 :   // going to be managed by this nsImageLoader.
     135               0 :   nsPresContext* presContext = mFrame->PresContext();
     136                 : 
     137                 :   nsLayoutUtils::DeregisterImageRequest(presContext, mRequest,
     138               0 :                                         &mRequestRegistered);
     139                 : 
     140                 :   // Make sure to clone into a temporary, then set mRequest, since
     141                 :   // cloning may notify and we don't want to trigger paints from this
     142                 :   // code.
     143               0 :   nsCOMPtr<imgIRequest> newRequest;
     144               0 :   nsresult rv = aImage->Clone(this, getter_AddRefs(newRequest));
     145               0 :   mRequest.swap(newRequest);
     146                 : 
     147               0 :   if (mRequest) {
     148                 :     nsLayoutUtils::RegisterImageRequestIfAnimated(presContext, mRequest,
     149               0 :                                                   &mRequestRegistered);
     150                 :   }
     151                 : 
     152               0 :   return rv;
     153                 : }
     154                 : 
     155               0 : NS_IMETHODIMP nsImageLoader::OnStartContainer(imgIRequest *aRequest,
     156                 :                                               imgIContainer *aImage)
     157                 : {
     158               0 :   NS_ABORT_IF_FALSE(aImage, "Who's calling us then?");
     159                 : 
     160                 :   /* Get requested animation policy from the pres context:
     161                 :    *   normal = 0
     162                 :    *   one frame = 1
     163                 :    *   one loop = 2
     164                 :    */
     165               0 :   aImage->SetAnimationMode(mFrame->PresContext()->ImageAnimationMode());
     166                 : 
     167               0 :   return NS_OK;
     168                 : }
     169                 : 
     170               0 : NS_IMETHODIMP nsImageLoader::OnStopFrame(imgIRequest *aRequest,
     171                 :                                          PRUint32 aFrame)
     172                 : {
     173               0 :   if (!mFrame)
     174               0 :     return NS_ERROR_FAILURE;
     175                 : 
     176               0 :   if (!mRequest) {
     177                 :     // We're in the middle of a paint anyway
     178               0 :     return NS_OK;
     179                 :   }
     180                 : 
     181                 :   // Take requested actions
     182               0 :   if (mActions & ACTION_REFLOW_ON_DECODE) {
     183               0 :     DoReflow();
     184                 :   }
     185               0 :   if (mActions & ACTION_REDRAW_ON_DECODE) {
     186               0 :     DoRedraw(nsnull);
     187                 :   }
     188               0 :   return NS_OK;
     189                 : }
     190                 : 
     191               0 : NS_IMETHODIMP nsImageLoader::OnImageIsAnimated(imgIRequest *aRequest)
     192                 : {
     193                 :   // Register with the refresh driver now that we are aware that
     194                 :   // we are animated.
     195                 :   nsLayoutUtils::RegisterImageRequest(mFrame->PresContext(),
     196               0 :                                       aRequest, &mRequestRegistered);
     197               0 :   return NS_OK;
     198                 : }
     199                 : 
     200               0 : NS_IMETHODIMP nsImageLoader::OnStopRequest(imgIRequest *aRequest,
     201                 :                                            bool aLastPart)
     202                 : {
     203               0 :   if (!mFrame)
     204               0 :     return NS_ERROR_FAILURE;
     205                 : 
     206               0 :   if (!mRequest) {
     207                 :     // We're in the middle of a paint anyway
     208               0 :     return NS_OK;
     209                 :   }
     210                 : 
     211                 :   // Take requested actions
     212               0 :   if (mActions & ACTION_REFLOW_ON_LOAD) {
     213               0 :     DoReflow();
     214                 :   }
     215               0 :   if (mActions & ACTION_REDRAW_ON_LOAD) {
     216               0 :     DoRedraw(nsnull);
     217                 :   }
     218               0 :   return NS_OK;
     219                 : }
     220                 : 
     221               0 : NS_IMETHODIMP nsImageLoader::FrameChanged(imgIRequest *aRequest,
     222                 :                                           imgIContainer *aContainer,
     223                 :                                           const nsIntRect *aDirtyRect)
     224                 : {
     225               0 :   if (!mFrame)
     226               0 :     return NS_ERROR_FAILURE;
     227                 : 
     228               0 :   if (!mRequest) {
     229                 :     // We're in the middle of a paint anyway
     230               0 :     return NS_OK;
     231                 :   }
     232                 : 
     233               0 :   NS_ASSERTION(aRequest == mRequest, "This is a neat trick.");
     234                 : 
     235               0 :   nsRect r = aDirtyRect->IsEqualInterior(nsIntRect::GetMaxSizedIntRect()) ?
     236               0 :     nsRect(nsPoint(0, 0), mFrame->GetSize()) :
     237               0 :     aDirtyRect->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel());
     238                 : 
     239               0 :   DoRedraw(&r);
     240                 : 
     241               0 :   return NS_OK;
     242                 : }
     243                 : 
     244                 : void
     245               0 : nsImageLoader::DoReflow()
     246                 : {
     247               0 :   nsIPresShell *shell = mFrame->PresContext()->GetPresShell();
     248               0 :   shell->FrameNeedsReflow(mFrame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
     249               0 : }
     250                 : 
     251                 : void
     252               0 : nsImageLoader::DoRedraw(const nsRect* aDamageRect)
     253                 : {
     254                 :   // NOTE: It is not sufficient to invalidate only the size of the image:
     255                 :   //       the image may be tiled! 
     256                 :   //       The best option is to call into the frame, however lacking this
     257                 :   //       we have to at least invalidate the frame's bounds, hence
     258                 :   //       as long as we have a frame we'll use its size.
     259                 :   //
     260                 : 
     261                 :   // Invalidate the entire frame
     262                 :   // XXX We really only need to invalidate the client area of the frame...    
     263                 : 
     264               0 :   nsRect bounds(nsPoint(0, 0), mFrame->GetSize());
     265                 : 
     266               0 :   if (mFrame->GetType() == nsGkAtoms::canvasFrame) {
     267                 :     // The canvas's background covers the whole viewport.
     268               0 :     bounds = mFrame->GetVisualOverflowRect();
     269                 :   }
     270                 : 
     271                 :   // XXX this should be ok, but there is some crappy ass bug causing it not to work
     272                 :   // XXX seems related to the "body fixup rule" dealing with the canvas and body frames...
     273                 : #if 0
     274                 :   // Invalidate the entire frame only if the frame has a tiled background
     275                 :   // image, otherwise just invalidate the intersection of the frame's bounds
     276                 :   // with the damaged rect.
     277                 :   nsStyleContext* styleContext;
     278                 :   mFrame->GetStyleContext(&styleContext);
     279                 :   const nsStyleBackground* bg = styleContext->GetStyleBackground();
     280                 : 
     281                 :   if ((bg->mBackgroundFlags & NS_STYLE_BG_IMAGE_NONE) ||
     282                 :       (bg->mBackgroundRepeat == NS_STYLE_BG_REPEAT_OFF)) {
     283                 :     // The frame does not have a background image so we are free
     284                 :     // to invalidate only the intersection of the damage rect and
     285                 :     // the frame's bounds.
     286                 : 
     287                 :     if (aDamageRect) {
     288                 :       bounds.IntersectRect(*aDamageRect, bounds);
     289                 :     }
     290                 :   }
     291                 : 
     292                 : #endif
     293                 : 
     294               0 :   if (mFrame->GetStyleVisibility()->IsVisible()) {
     295               0 :     mFrame->Invalidate(bounds);
     296                 :   }
     297               0 : }

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