The Tor Browser: gfx/layers/basic/BasicThebesLayer.cpp@b8a032363ba2 (annotated)

gfx/layers/basic/BasicThebesLayer.cpp@b8a032363ba2 (annotated)

gfx/layers/basic/BasicThebesLayer.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- 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 "BasicThebesLayer.h"
 #include <stdint.h>                     // for uint32_t
 #include "GeckoProfiler.h"              // for PROFILER_LABEL
 #include "ReadbackLayer.h"              // for ReadbackLayer, ReadbackSink
 #include "ReadbackProcessor.h"          // for ReadbackProcessor::Update, etc
 #include "RenderTrace.h"                // for RenderTraceInvalidateEnd, etc
 #include "BasicLayersImpl.h"            // for AutoMaskData, etc
 #include "gfxContext.h"                 // for gfxContext, etc
 #include "gfxRect.h"                    // for gfxRect
 #include "gfxUtils.h"                   // for gfxUtils
 #include "mozilla/gfx/2D.h"             // for DrawTarget
 #include "mozilla/gfx/BaseRect.h"       // for BaseRect
 #include "mozilla/gfx/Matrix.h"         // for Matrix
 #include "mozilla/gfx/Rect.h"           // for Rect, IntRect
 #include "mozilla/gfx/Types.h"          // for Float, etc
 #include "mozilla/layers/LayersTypes.h"
 #include "nsAutoPtr.h"                  // for nsRefPtr
 #include "nsCOMPtr.h"                   // for already_AddRefed
 #include "nsISupportsImpl.h"            // for gfxContext::Release, etc
 #include "nsPoint.h"                    // for nsIntPoint
 #include "nsRect.h"                     // for nsIntRect
 #include "nsTArray.h"                   // for nsTArray, nsTArray_Impl
 #include "AutoMaskData.h"
 #include "gfx2DGlue.h"
 using namespace mozilla::gfx;
 namespace mozilla {
 namespace layers {
 static nsIntRegion
 IntersectWithClip(const nsIntRegion& aRegion, gfxContext* aContext)
 {
   gfxRect clip = aContext->GetClipExtents();
   clip.RoundOut();
   nsIntRect r(clip.X(), clip.Y(), clip.Width(), clip.Height());
   nsIntRegion result;
   result.And(aRegion, r);
   return result;
 }
 void
 BasicThebesLayer::PaintThebes(gfxContext* aContext,
                               Layer* aMaskLayer,
                               LayerManager::DrawThebesLayerCallback aCallback,
                               void* aCallbackData,
                               ReadbackProcessor* aReadback)
 {
   PROFILER_LABEL("BasicThebesLayer", "PaintThebes");
   NS_ASSERTION(BasicManager()->InDrawing(),
                "Can only draw in drawing phase");
   nsTArray<ReadbackProcessor::Update> readbackUpdates;
   if (aReadback && UsedForReadback()) {
     aReadback->GetThebesLayerUpdates(this, &readbackUpdates);
   }
   float opacity = GetEffectiveOpacity();
   CompositionOp effectiveOperator = GetEffectiveOperator(this);
   if (!BasicManager()->IsRetained()) {
     NS_ASSERTION(readbackUpdates.IsEmpty(), "Can't do readback for non-retained layer");
     mValidRegion.SetEmpty();
     mContentClient->Clear();
     nsIntRegion toDraw = IntersectWithClip(GetEffectiveVisibleRegion(), aContext);
     RenderTraceInvalidateStart(this, "FFFF00", toDraw.GetBounds());
     if (!toDraw.IsEmpty() && !IsHidden()) {
       if (!aCallback) {
         BasicManager()->SetTransactionIncomplete();
         return;
       }
       aContext->Save();
       bool needsClipToVisibleRegion = GetClipToVisibleRegion();
       bool needsGroup = opacity != 1.0 ||
                         effectiveOperator != CompositionOp::OP_OVER ||
                         aMaskLayer;
       nsRefPtr<gfxContext> groupContext;
       if (needsGroup) {
         groupContext =
           BasicManager()->PushGroupForLayer(aContext, this, toDraw,
                                             &needsClipToVisibleRegion);
         if (effectiveOperator != CompositionOp::OP_OVER) {
           needsClipToVisibleRegion = true;
         }
       } else {
         groupContext = aContext;
       }
       SetAntialiasingFlags(this, groupContext);
       aCallback(this, groupContext, toDraw, DrawRegionClip::CLIP_NONE, nsIntRegion(), aCallbackData);
       if (needsGroup) {
         BasicManager()->PopGroupToSourceWithCachedSurface(aContext, groupContext);
         if (needsClipToVisibleRegion) {
           gfxUtils::ClipToRegion(aContext, toDraw);
         }
         AutoSetOperator setOptimizedOperator(aContext, ThebesOp(effectiveOperator));
         PaintWithMask(aContext, opacity, aMaskLayer);
       }
       aContext->Restore();
     }
     RenderTraceInvalidateEnd(this, "FFFF00");
     return;
   }
   if (BasicManager()->IsTransactionIncomplete())
     return;
   gfxRect clipExtents;
   clipExtents = aContext->GetClipExtents();
   // Pull out the mask surface and transform here, because the mask
   // is internal to basic layers
   AutoMoz2DMaskData mask;
   SourceSurface* maskSurface = nullptr;
   Matrix maskTransform;
   if (GetMaskData(aMaskLayer, Point(), &mask)) {
     maskSurface = mask.GetSurface();
     maskTransform = mask.GetTransform();
   }
   if (!IsHidden() && !clipExtents.IsEmpty()) {
     mContentClient->DrawTo(this, aContext->GetDrawTarget(), opacity,
                            GetOperator(),
                            maskSurface, &maskTransform);
   }
   for (uint32_t i = 0; i < readbackUpdates.Length(); ++i) {
     ReadbackProcessor::Update& update = readbackUpdates[i];
     nsIntPoint offset = update.mLayer->GetBackgroundLayerOffset();
     nsRefPtr<gfxContext> ctx =
       update.mLayer->GetSink()->BeginUpdate(update.mUpdateRect + offset,
                                             update.mSequenceCounter);
     if (ctx) {
       NS_ASSERTION(opacity == 1.0, "Should only read back opaque layers");
       ctx->Translate(gfxPoint(offset.x, offset.y));
       mContentClient->DrawTo(this, ctx->GetDrawTarget(), 1.0,
                              CompositionOpForOp(ctx->CurrentOperator()),
                              maskSurface, &maskTransform);
       update.mLayer->GetSink()->EndUpdate(ctx, update.mUpdateRect + offset);
     }
   }
 }
 void
 BasicThebesLayer::Validate(LayerManager::DrawThebesLayerCallback aCallback,
                            void* aCallbackData)
 {
   if (!mContentClient) {
     // This client will have a null Forwarder, which means it will not have
     // a ContentHost on the other side.
     mContentClient = new ContentClientBasic();
   }
   if (!BasicManager()->IsRetained()) {
     return;
   }
   uint32_t flags = 0;
 #ifndef MOZ_WIDGET_ANDROID
   if (BasicManager()->CompositorMightResample()) {
     flags |= RotatedContentBuffer::PAINT_WILL_RESAMPLE;
   }
   if (!(flags & RotatedContentBuffer::PAINT_WILL_RESAMPLE)) {
     if (MayResample()) {
       flags |= RotatedContentBuffer::PAINT_WILL_RESAMPLE;
     }
   }
 #endif
   if (mDrawAtomically) {
     flags |= RotatedContentBuffer::PAINT_NO_ROTATION;
   }
   PaintState state =
     mContentClient->BeginPaintBuffer(this, flags);
   mValidRegion.Sub(mValidRegion, state.mRegionToInvalidate);
   if (DrawTarget* target = mContentClient->BorrowDrawTargetForPainting(state)) {
     // The area that became invalid and is visible needs to be repainted
     // (this could be the whole visible area if our buffer switched
     // from RGB to RGBA, because we might need to repaint with
     // subpixel AA)
     state.mRegionToInvalidate.And(state.mRegionToInvalidate,
                                   GetEffectiveVisibleRegion());
     SetAntialiasingFlags(this, target);
     RenderTraceInvalidateStart(this, "FFFF00", state.mRegionToDraw.GetBounds());
     nsRefPtr<gfxContext> ctx = gfxContext::ContextForDrawTarget(target);
     PaintBuffer(ctx,
                 state.mRegionToDraw, state.mRegionToDraw, state.mRegionToInvalidate,
                 state.mDidSelfCopy,
                 state.mClip,
                 aCallback, aCallbackData);
     MOZ_LAYERS_LOG_IF_SHADOWABLE(this, ("Layer::Mutated(%p) PaintThebes", this));
     Mutated();
     ctx = nullptr;
     mContentClient->ReturnDrawTargetToBuffer(target);
     RenderTraceInvalidateEnd(this, "FFFF00");
   } else {
     // It's possible that state.mRegionToInvalidate is nonempty here,
     // if we are shrinking the valid region to nothing. So use mRegionToDraw
     // instead.
     NS_WARN_IF_FALSE(state.mRegionToDraw.IsEmpty(),
                      "No context when we have something to draw, resource exhaustion?");
   }
 }
 already_AddRefed<ThebesLayer>
 BasicLayerManager::CreateThebesLayer()
 {
   NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
   nsRefPtr<ThebesLayer> layer = new BasicThebesLayer(this);
   return layer.forget();
 }
 }
 }

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gfx/layers/basic/BasicThebesLayer.cpp@b8a032363ba2 (annotated)

gfx/layers/basic/BasicThebesLayer.cpp