LCOV - code coverage report
Current view: directory - gfx/layers - ReadbackProcessor.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 94 0 0.0 %
Date: 2012-06-02 Functions: 5 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Corporation code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2011
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Robert O'Callahan <robert@ocallahan.org>
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include "ReadbackProcessor.h"
      39                 : 
      40                 : namespace mozilla {
      41                 : namespace layers {
      42                 : 
      43                 : void
      44               0 : ReadbackProcessor::BuildUpdates(ContainerLayer* aContainer)
      45                 : {
      46               0 :   NS_ASSERTION(mAllUpdates.IsEmpty(), "Some updates not processed?");
      47                 : 
      48               0 :   if (!aContainer->mMayHaveReadbackChild)
      49               0 :     return;
      50                 : 
      51               0 :   aContainer->mMayHaveReadbackChild = false;
      52                 :   // go backwards so the updates read from earlier layers are later in the
      53                 :   // array.
      54               0 :   for (Layer* l = aContainer->GetLastChild(); l; l = l->GetPrevSibling()) {
      55               0 :     if (l->GetType() == Layer::TYPE_READBACK) {
      56               0 :       aContainer->mMayHaveReadbackChild = true;
      57               0 :       BuildUpdatesForLayer(static_cast<ReadbackLayer*>(l));
      58                 :     }
      59                 :   }
      60                 : }
      61                 : 
      62                 : static Layer*
      63               0 : FindBackgroundLayer(ReadbackLayer* aLayer, nsIntPoint* aOffset)
      64                 : {
      65               0 :   gfxMatrix transform;
      66               0 :   if (!aLayer->GetTransform().Is2D(&transform) ||
      67               0 :       transform.HasNonIntegerTranslation())
      68               0 :     return nsnull;
      69               0 :   nsIntPoint transformOffset(PRInt32(transform.x0), PRInt32(transform.y0));
      70                 : 
      71               0 :   for (Layer* l = aLayer->GetPrevSibling(); l; l = l->GetPrevSibling()) {
      72               0 :     gfxMatrix backgroundTransform;
      73               0 :     if (!l->GetTransform().Is2D(&backgroundTransform) ||
      74               0 :         backgroundTransform.HasNonIntegerTranslation())
      75               0 :       return nsnull;
      76                 : 
      77               0 :     nsIntPoint backgroundOffset(PRInt32(backgroundTransform.x0), PRInt32(backgroundTransform.y0));
      78               0 :     nsIntRect rectInBackground(transformOffset - backgroundOffset, aLayer->GetSize());
      79               0 :     const nsIntRegion& visibleRegion = l->GetEffectiveVisibleRegion();
      80               0 :     if (!visibleRegion.Intersects(rectInBackground))
      81               0 :       continue;
      82                 :     // Since l is present in the background, from here on we either choose l
      83                 :     // or nothing.
      84               0 :     if (!visibleRegion.Contains(rectInBackground))
      85               0 :       return nsnull;
      86                 : 
      87               0 :     if (l->GetEffectiveOpacity() != 1.0 ||
      88               0 :         !(l->GetContentFlags() & Layer::CONTENT_OPAQUE))
      89               0 :       return nsnull;
      90                 : 
      91                 :     // cliprects are post-transform
      92               0 :     const nsIntRect* clipRect = l->GetEffectiveClipRect();
      93               0 :     if (clipRect && !clipRect->Contains(nsIntRect(transformOffset, aLayer->GetSize())))
      94               0 :       return nsnull;
      95                 : 
      96               0 :     Layer::LayerType type = l->GetType();
      97               0 :     if (type != Layer::TYPE_COLOR && type != Layer::TYPE_THEBES)
      98               0 :       return nsnull;
      99                 : 
     100               0 :     *aOffset = backgroundOffset - transformOffset;
     101               0 :     return l;
     102                 :   }
     103                 : 
     104               0 :   return nsnull;
     105                 : }
     106                 : 
     107                 : void
     108               0 : ReadbackProcessor::BuildUpdatesForLayer(ReadbackLayer* aLayer)
     109                 : {
     110               0 :   if (!aLayer->mSink)
     111               0 :     return;
     112                 : 
     113               0 :   nsIntPoint offset;
     114               0 :   Layer* newBackground = FindBackgroundLayer(aLayer, &offset);
     115               0 :   if (!newBackground) {
     116               0 :     aLayer->SetUnknown();
     117               0 :     return;
     118                 :   }
     119                 : 
     120               0 :   if (newBackground->GetType() == Layer::TYPE_COLOR) {
     121               0 :     ColorLayer* colorLayer = static_cast<ColorLayer*>(newBackground);
     122               0 :     if (aLayer->mBackgroundColor != colorLayer->GetColor()) {
     123               0 :       aLayer->mBackgroundLayer = nsnull;
     124               0 :       aLayer->mBackgroundColor = colorLayer->GetColor();
     125               0 :       NS_ASSERTION(aLayer->mBackgroundColor.a == 1.0,
     126                 :                    "Color layer said it was opaque!");
     127                 :       nsRefPtr<gfxContext> ctx =
     128               0 :           aLayer->mSink->BeginUpdate(aLayer->GetRect(),
     129               0 :                                      aLayer->AllocateSequenceNumber());
     130               0 :       if (ctx) {
     131               0 :         ctx->SetColor(aLayer->mBackgroundColor);
     132               0 :         nsIntSize size = aLayer->GetSize();
     133               0 :         ctx->Rectangle(gfxRect(0, 0, size.width, size.height));
     134               0 :         ctx->Fill();
     135               0 :         aLayer->mSink->EndUpdate(ctx, aLayer->GetRect());
     136                 :       }
     137                 :     }
     138                 :   } else {
     139               0 :     NS_ASSERTION(newBackground->AsThebesLayer(), "Must be ThebesLayer");
     140               0 :     ThebesLayer* thebesLayer = static_cast<ThebesLayer*>(newBackground);
     141                 :     // updateRect is relative to the ThebesLayer
     142               0 :     nsIntRect updateRect = aLayer->GetRect() - offset;
     143               0 :     if (thebesLayer != aLayer->mBackgroundLayer ||
     144               0 :         offset != aLayer->mBackgroundLayerOffset) {
     145               0 :       aLayer->mBackgroundLayer = thebesLayer;
     146               0 :       aLayer->mBackgroundLayerOffset = offset;
     147               0 :       aLayer->mBackgroundColor = gfxRGBA(0,0,0,0);
     148               0 :       thebesLayer->SetUsedForReadback(true);
     149                 :     } else {
     150               0 :       nsIntRegion invalid;
     151               0 :       invalid.Sub(updateRect, thebesLayer->GetValidRegion());
     152               0 :       updateRect = invalid.GetBounds();
     153                 :     }
     154                 : 
     155               0 :     Update update = { aLayer, updateRect, aLayer->AllocateSequenceNumber() };
     156               0 :     mAllUpdates.AppendElement(update);
     157                 :   }
     158                 : }
     159                 : 
     160                 : void
     161               0 : ReadbackProcessor::GetThebesLayerUpdates(ThebesLayer* aLayer,
     162                 :                                          nsTArray<Update>* aUpdates,
     163                 :                                          nsIntRegion* aUpdateRegion)
     164                 : {
     165                 :   // All ThebesLayers used for readback are in mAllUpdates (some possibly
     166                 :   // with an empty update rect).
     167               0 :   aLayer->SetUsedForReadback(false);
     168               0 :   if (aUpdateRegion) {
     169               0 :     aUpdateRegion->SetEmpty();
     170                 :   }
     171               0 :   for (PRUint32 i = mAllUpdates.Length(); i > 0; --i) {
     172               0 :     const Update& update = mAllUpdates[i - 1];
     173               0 :     if (update.mLayer->mBackgroundLayer == aLayer) {
     174               0 :       aLayer->SetUsedForReadback(true);
     175                 :       // Don't bother asking for updates if we have an empty update rect.
     176               0 :       if (!update.mUpdateRect.IsEmpty()) {
     177               0 :         aUpdates->AppendElement(update);
     178               0 :         if (aUpdateRegion) {
     179               0 :           aUpdateRegion->Or(*aUpdateRegion, update.mUpdateRect);
     180                 :         }
     181                 :       }
     182               0 :       mAllUpdates.RemoveElementAt(i - 1);
     183                 :     }
     184                 :   }
     185               0 : }
     186                 : 
     187               0 : ReadbackProcessor::~ReadbackProcessor()
     188                 : {
     189               0 :   for (PRUint32 i = mAllUpdates.Length(); i > 0; --i) {
     190               0 :     const Update& update = mAllUpdates[i - 1];
     191                 :     // Unprocessed update. Notify the readback sink that this content is
     192                 :     // unknown.
     193               0 :     update.mLayer->SetUnknown();
     194                 :   }
     195               0 : }
     196                 : 
     197                 : }
     198                 : }

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