C++ LayoutDeviceIntRect::ToUnknownRect方法代码示例

already_AddRefed<gfx::DrawTarget>
CompositorWidgetProxy::CreateBackBufferDrawTarget(gfx::DrawTarget* aScreenTarget,
                                                  const LayoutDeviceIntRect& aRect,
                                                  const LayoutDeviceIntRect& aClearRect)
{
  MOZ_ASSERT(aScreenTarget);
  gfx::SurfaceFormat format = gfx::SurfaceFormat::B8G8R8A8;
  gfx::IntSize size = aRect.ToUnknownRect().Size();
  gfx::IntSize clientSize(GetClientSize().ToUnknownSize());

  RefPtr<gfx::DrawTarget> target;
  // Re-use back buffer if possible
  if (mLastBackBuffer &&
      mLastBackBuffer->GetBackendType() == aScreenTarget->GetBackendType() &&
      mLastBackBuffer->GetFormat() == format &&
      size <= mLastBackBuffer->GetSize() &&
      mLastBackBuffer->GetSize() <= clientSize) {
    target = mLastBackBuffer;
    target->SetTransform(gfx::Matrix());
    if (!aClearRect.IsEmpty()) {
      gfx::IntRect clearRect = aClearRect.ToUnknownRect() - aRect.ToUnknownRect().TopLeft();
      target->ClearRect(gfx::Rect(clearRect.x, clearRect.y, clearRect.width, clearRect.height));
    }
  } else {
    target = aScreenTarget->CreateSimilarDrawTarget(size, format);
    mLastBackBuffer = target;
  }
  return target.forget();
}

void
ClientLayerManager::MakeSnapshotIfRequired()
{
  if (!mShadowTarget) {
    return;
  }
  if (mWidget) {
    if (CompositorBridgeChild* remoteRenderer = GetRemoteRenderer()) {
      // The compositor doesn't draw to a different sized surface
      // when there's a rotation. Instead we rotate the result
      // when drawing into dt
      LayoutDeviceIntRect outerBounds;
      mWidget->GetBounds(outerBounds);

      IntRect bounds = ToOutsideIntRect(mShadowTarget->GetClipExtents());
      if (mTargetRotation) {
        bounds =
          RotateRect(bounds, outerBounds.ToUnknownRect(), mTargetRotation);
      }

      SurfaceDescriptor inSnapshot;
      if (!bounds.IsEmpty() &&
          mForwarder->AllocSurfaceDescriptor(bounds.Size(),
                                             gfxContentType::COLOR_ALPHA,
                                             &inSnapshot)) {

        // Make a copy of |inSnapshot| because the call to send it over IPC
        // will call forget() on the Shmem inside, and zero it out.
        SurfaceDescriptor outSnapshot = inSnapshot;

        if (remoteRenderer->SendMakeSnapshot(inSnapshot, bounds)) {
          RefPtr<DataSourceSurface> surf = GetSurfaceForDescriptor(outSnapshot);
          DrawTarget* dt = mShadowTarget->GetDrawTarget();

          Rect dstRect(bounds.x, bounds.y, bounds.width, bounds.height);
          Rect srcRect(0, 0, bounds.width, bounds.height);

          gfx::Matrix rotate =
            ComputeTransformForUnRotation(outerBounds.ToUnknownRect(),
                                          mTargetRotation);

          gfx::Matrix oldMatrix = dt->GetTransform();
          dt->SetTransform(rotate * oldMatrix);
          dt->DrawSurface(surf, dstRect, srcRect,
                          DrawSurfaceOptions(),
                          DrawOptions(1.0f, CompositionOp::OP_OVER));
          dt->SetTransform(oldMatrix);
        }
        mForwarder->DestroySurfaceDescriptor(&outSnapshot);
      }
    }
  }
  mShadowTarget = nullptr;
}

//.........这里部分代码省略.........
          sm->ScreenForRect(NSToIntRound(frameRect.x / scale),
                            NSToIntRound(frameRect.y / scale), 1, 1,
                            getter_AddRefs(screen));
          if (screen) {
            LayoutDeviceIntRect screenRect;
            screen->GetRect(&screenRect.x, &screenRect.y,
                            &screenRect.width, &screenRect.height);
            rect.IntersectRect(rect, screenRect);
          }
        }
      }
      else if (menuPopupFrame) {
        nsRect frameRect = menuPopupFrame->GetScreenRectInAppUnits();
        nsIFrame* rootFrame = aPresContext->PresShell()->FrameManager()->GetRootFrame();
        nsRect rootScreenRect = rootFrame->GetScreenRectInAppUnits();

        nsPopupLevel popupLevel = menuPopupFrame->PopupLevel();
        int32_t appPerDev = aPresContext->AppUnitsPerDevPixel();
        LayoutDeviceIntRect screenRect = menuPopupFrame->GetConstraintRect
          (LayoutDeviceIntRect::FromAppUnitsToNearest(frameRect, appPerDev),
           // round using ...ToInside as it's better to be a pixel too small
           // than be too large. If the popup is too large it could get flipped
           // to the opposite side of the anchor point while resizing.
           LayoutDeviceIntRect::FromAppUnitsToInside(rootScreenRect, appPerDev),
           popupLevel);
        rect.IntersectRect(rect, screenRect);
      }

      if (contentToResize) {
        // convert the rectangle into css pixels. When changing the size in a
        // direction, don't allow the new size to be less that the resizer's
        // size. This ensures that content isn't resized too small as to make
        // the resizer invisible.
        nsRect appUnitsRect = ToAppUnits(rect.ToUnknownRect(), aPresContext->AppUnitsPerDevPixel());
        if (appUnitsRect.width < mRect.width && mouseMove.x)
          appUnitsRect.width = mRect.width;
        if (appUnitsRect.height < mRect.height && mouseMove.y)
          appUnitsRect.height = mRect.height;
        nsIntRect cssRect = appUnitsRect.ToInsidePixels(nsPresContext::AppUnitsPerCSSPixel());

        LayoutDeviceIntRect oldRect;
        nsWeakFrame weakFrame(menuPopupFrame);
        if (menuPopupFrame) {
          nsCOMPtr<nsIWidget> widget = menuPopupFrame->GetWidget();
          if (widget)
            widget->GetScreenBounds(oldRect);

          // convert the new rectangle into outer window coordinates
          LayoutDeviceIntPoint clientOffset = widget->GetClientOffset();
          rect.x -= clientOffset.x;
          rect.y -= clientOffset.y;
        }

        SizeInfo sizeInfo, originalSizeInfo;
        sizeInfo.width.AppendInt(cssRect.width);
        sizeInfo.height.AppendInt(cssRect.height);
        ResizeContent(contentToResize, direction, sizeInfo, &originalSizeInfo);
        MaybePersistOriginalSize(contentToResize, originalSizeInfo);

        // Move the popup to the new location unless it is anchored, since
        // the position shouldn't change. nsMenuPopupFrame::SetPopupPosition
        // will instead ensure that the popup's position is anchored at the
        // right place.
        if (weakFrame.IsAlive() &&
            (oldRect.x != rect.x || oldRect.y != rect.y) &&
            (!menuPopupFrame->IsAnchored() ||

void
ClientLayerManager::BeginTransactionWithTarget(gfxContext* aTarget)
{
  mInTransaction = true;
  mTransactionStart = TimeStamp::Now();

#ifdef MOZ_LAYERS_HAVE_LOG
  MOZ_LAYERS_LOG(("[----- BeginTransaction"));
  Log();
#endif

  NS_ASSERTION(!InTransaction(), "Nested transactions not allowed");
  mPhase = PHASE_CONSTRUCTION;

  MOZ_ASSERT(mKeepAlive.IsEmpty(), "uncommitted txn?");
  RefPtr<gfxContext> targetContext = aTarget;

  // If the last transaction was incomplete (a failed DoEmptyTransaction),
  // don't signal a new transaction to ShadowLayerForwarder. Carry on adding
  // to the previous transaction.
  dom::ScreenOrientationInternal orientation;
  if (dom::TabChild* window = mWidget->GetOwningTabChild()) {
    orientation = window->GetOrientation();
  } else {
    hal::ScreenConfiguration currentConfig;
    hal::GetCurrentScreenConfiguration(&currentConfig);
    orientation = currentConfig.orientation();
  }
  LayoutDeviceIntRect targetBounds = mWidget->GetNaturalBounds();
  targetBounds.x = targetBounds.y = 0;
  mForwarder->BeginTransaction(targetBounds.ToUnknownRect(), mTargetRotation,
                               orientation);

  // If we're drawing on behalf of a context with async pan/zoom
  // enabled, then the entire buffer of painted layers might be
  // composited (including resampling) asynchronously before we get
  // a chance to repaint, so we have to ensure that it's all valid
  // and not rotated.
  //
  // Desktop does not support async zoom yet, so we ignore this for those
  // platforms.
#if defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GONK) || defined(MOZ_WIDGET_UIKIT)
  if (mWidget && mWidget->GetOwningTabChild()) {
    mCompositorMightResample = AsyncPanZoomEnabled();
  }
#endif

  // If we have a non-default target, we need to let our shadow manager draw
  // to it. This will happen at the end of the transaction.
  if (aTarget && XRE_IsParentProcess()) {
    mShadowTarget = aTarget;
  } else {
    NS_ASSERTION(!aTarget,
                 "Content-process ClientLayerManager::BeginTransactionWithTarget not supported");
  }

  // If this is a new paint, increment the paint sequence number.
  if (!mIsRepeatTransaction) {
    // Increment the paint sequence number even if test logging isn't
    // enabled in this process; it may be enabled in the parent process,
    // and the parent process expects unique sequence numbers.
    ++mPaintSequenceNumber;
    if (gfxPrefs::APZTestLoggingEnabled()) {
      mApzTestData.StartNewPaint(mPaintSequenceNumber);
    }
  }
}

bool
ClientLayerManager::BeginTransactionWithTarget(gfxContext* aTarget)
{
  // Wait for any previous async paints to complete before starting to paint again.
  GetCompositorBridgeChild()->FlushAsyncPaints();

  MOZ_ASSERT(mForwarder, "ClientLayerManager::BeginTransaction without forwarder");
  if (!mForwarder->IPCOpen()) {
    gfxCriticalNote << "ClientLayerManager::BeginTransaction with IPC channel down. GPU process may have died.";
    return false;
  }

  if (XRE_IsContentProcess() &&
      mForwarder->DeviceCanReset() &&
      mDeviceResetSequenceNumber != CompositorBridgeChild::Get()->DeviceResetSequenceNumber())
  {
    // The compositor has informed this process that a device reset occurred,
    // but it has not finished informing each TabChild of its new
    // TextureFactoryIdentifier. Until then, it's illegal to paint. Note that
    // it is also illegal to request a new TIF synchronously, because we're
    // not guaranteed the UI process has finished acquiring new compositors
    // for each widget.
    //
    // Note that we only do this for accelerated backends, since we do not
    // perform resets on basic compositors.
    gfxCriticalNote << "Discarding a paint since a device reset has not yet been acknowledged.";
    return false;
  }

  mInTransaction = true;
  mTransactionStart = TimeStamp::Now();

#ifdef MOZ_LAYERS_HAVE_LOG
  MOZ_LAYERS_LOG(("[----- BeginTransaction"));
  Log();
#endif

  NS_ASSERTION(!InTransaction(), "Nested transactions not allowed");
  mPhase = PHASE_CONSTRUCTION;

  MOZ_ASSERT(mKeepAlive.IsEmpty(), "uncommitted txn?");

  // If the last transaction was incomplete (a failed DoEmptyTransaction),
  // don't signal a new transaction to ShadowLayerForwarder. Carry on adding
  // to the previous transaction.
  dom::ScreenOrientationInternal orientation;
  if (dom::TabChild* window = mWidget->GetOwningTabChild()) {
    orientation = window->GetOrientation();
  } else {
    hal::ScreenConfiguration currentConfig;
    hal::GetCurrentScreenConfiguration(&currentConfig);
    orientation = currentConfig.orientation();
  }
  LayoutDeviceIntRect targetBounds = mWidget->GetNaturalBounds();
  targetBounds.x = targetBounds.y = 0;
  mForwarder->BeginTransaction(targetBounds.ToUnknownRect(), mTargetRotation,
                               orientation);

  // If we're drawing on behalf of a context with async pan/zoom
  // enabled, then the entire buffer of painted layers might be
  // composited (including resampling) asynchronously before we get
  // a chance to repaint, so we have to ensure that it's all valid
  // and not rotated.
  //
  // Desktop does not support async zoom yet, so we ignore this for those
  // platforms.
#if defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_UIKIT)
  if (mWidget && mWidget->GetOwningTabChild()) {
    mCompositorMightResample = AsyncPanZoomEnabled();
  }
#endif

  // If we have a non-default target, we need to let our shadow manager draw
  // to it. This will happen at the end of the transaction.
  if (aTarget && XRE_IsParentProcess()) {
    mShadowTarget = aTarget;
  } else {
    NS_ASSERTION(!aTarget,
                 "Content-process ClientLayerManager::BeginTransactionWithTarget not supported");
  }

  // If this is a new paint, increment the paint sequence number.
  if (!mIsRepeatTransaction) {
    // Increment the paint sequence number even if test logging isn't
    // enabled in this process; it may be enabled in the parent process,
    // and the parent process expects unique sequence numbers.
    ++mPaintSequenceNumber;
    if (gfxPrefs::APZTestLoggingEnabled()) {
      mApzTestData.StartNewPaint(mPaintSequenceNumber);
    }
  }
  return true;
}