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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "ClientPaintedLayer.h"
#include "ClientTiledPaintedLayer.h"     // for ClientTiledPaintedLayer
#include <stdint.h>                     // for uint32_t
#include "GeckoProfiler.h"              // for AUTO_PROFILER_LABEL
#include "client/ClientLayerManager.h"  // for ClientLayerManager, etc
#include "gfxContext.h"                 // for gfxContext
#include "gfx2DGlue.h"
#include "gfxRect.h"                    // for gfxRect
#include "gfxPrefs.h"                   // for gfxPrefs
#include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
#include "mozilla/gfx/2D.h"             // for DrawTarget
#include "mozilla/gfx/DrawEventRecorder.h"
#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 "mozilla/Preferences.h"
#include "nsCOMPtr.h"                   // for already_AddRefed
#include "nsISupportsImpl.h"            // for Layer::AddRef, etc
#include "nsRect.h"                     // for mozilla::gfx::IntRect
#include "PaintThread.h"
#include "ReadbackProcessor.h"
#include "RotatedBuffer.h"

namespace mozilla {
namespace layers {

using namespace mozilla::gfx;

bool
ClientPaintedLayer::EnsureContentClient()
{
  if (!mContentClient) {
    mContentClient = ContentClient::CreateContentClient(
      ClientManager()->AsShadowForwarder());

    if (!mContentClient) {
      return false;
    }

    mContentClient->Connect();
    ClientManager()->AsShadowForwarder()->Attach(mContentClient, this);
    MOZ_ASSERT(mContentClient->GetForwarder());
  }

  return true;
}

void
ClientPaintedLayer::UpdateContentClient(PaintState& aState)
{
  Mutated();

  AddToValidRegion(aState.mRegionToDraw);

  ContentClientRemoteBuffer *contentClientRemote =
      static_cast<ContentClientRemoteBuffer *>(mContentClient.get());
  MOZ_ASSERT(contentClientRemote->GetIPCHandle());

  // Hold(this) ensures this layer is kept alive through the current transaction
  // The ContentClient assumes this layer is kept alive (e.g., in CreateBuffer),
  // so deleting this Hold for whatever reason will break things.
  ClientManager()->Hold(this);
  contentClientRemote->Updated(aState.mRegionToDraw,
                               mVisibleRegion.ToUnknownRegion());
}

bool
ClientPaintedLayer::UpdatePaintRegion(PaintState& aState)
{
  SubtractFromValidRegion(aState.mRegionToInvalidate);

  if (!aState.mRegionToDraw.IsEmpty() && !ClientManager()->GetPaintedLayerCallback()) {
    ClientManager()->SetTransactionIncomplete();
    return false;
   }

   // 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)
  aState.mRegionToInvalidate.And(aState.mRegionToInvalidate,
                                 GetLocalVisibleRegion().ToUnknownRegion());
  return true;
}

void
ClientPaintedLayer::FinishPaintState(PaintState& aState)
{
  if (aState.mAsyncTask && !aState.mAsyncTask->mCapture->IsEmpty()) {
    ClientManager()->SetQueuedAsyncPaints();
    PaintThread::Get()->QueuePaintTask(aState.mAsyncTask);
  }
}

uint32_t
ClientPaintedLayer::GetPaintFlags(ReadbackProcessor* aReadback)
{
  uint32_t flags = ContentClient::PAINT_CAN_DRAW_ROTATED;
  #ifndef MOZ_IGNORE_PAINT_WILL_RESAMPLE
   if (ClientManager()->CompositorMightResample()) {
     flags |= ContentClient::PAINT_WILL_RESAMPLE;
   }
   if (!(flags & ContentClient::PAINT_WILL_RESAMPLE)) {
     if (MayResample()) {
       flags |= ContentClient::PAINT_WILL_RESAMPLE;
     }
   }
  #endif
  if ((!aReadback || !UsedForReadback()) && PaintThread::Get()) {
    flags |= ContentClient::PAINT_ASYNC;
  }
  return flags;
}

void
ClientPaintedLayer::RenderLayerWithReadback(ReadbackProcessor *aReadback)
{
  AUTO_PROFILER_LABEL("ClientPaintedLayer::RenderLayerWithReadback", GRAPHICS);
  NS_ASSERTION(ClientManager()->InDrawing(),
               "Can only draw in drawing phase");

  RenderMaskLayers(this);

  if (!EnsureContentClient()) {
    return;
  }

  nsTArray<ReadbackProcessor::Update> readbackUpdates;
  nsIntRegion readbackRegion;
  if (aReadback && UsedForReadback()) {
    aReadback->GetPaintedLayerUpdates(this, &readbackUpdates);
  }

  uint32_t flags = GetPaintFlags(aReadback);

  PaintState state = mContentClient->BeginPaint(this, flags);
  if (!UpdatePaintRegion(state)) {
    mContentClient->EndPaint(state, nullptr);
    FinishPaintState(state);
    return;
  }

  bool didUpdate = false;
  RotatedBuffer::DrawIterator iter;
  while (DrawTarget* target = mContentClient->BorrowDrawTargetForPainting(state, &iter)) {
    SetAntialiasingFlags(this, target);

    RefPtr<gfxContext> ctx = gfxContext::CreatePreservingTransformOrNull(target);
    MOZ_ASSERT(ctx); // already checked the target above

    ClientManager()->GetPaintedLayerCallback()(this,
                                              ctx,
                                              iter.mDrawRegion,
                                              iter.mDrawRegion,
                                              state.mClip,
                                              state.mRegionToInvalidate,
                                              ClientManager()->GetPaintedLayerCallbackData());

    ctx = nullptr;
    mContentClient->ReturnDrawTarget(target);
    didUpdate = true;
  }

  mContentClient->EndPaint(state, &readbackUpdates);
  FinishPaintState(state);

  if (didUpdate) {
    UpdateContentClient(state);
  }
}

already_AddRefed<PaintedLayer>
ClientLayerManager::CreatePaintedLayer()
{
  return CreatePaintedLayerWithHint(NONE);
}

already_AddRefed<PaintedLayer>
ClientLayerManager::CreatePaintedLayerWithHint(PaintedLayerCreationHint aHint)
{
  NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
  if (gfxPlatform::GetPlatform()->UsesTiling()) {
    RefPtr<ClientTiledPaintedLayer> layer = new ClientTiledPaintedLayer(this, aHint);
    CREATE_SHADOW(Painted);
    return layer.forget();
  } else {
    RefPtr<ClientPaintedLayer> layer = new ClientPaintedLayer(this, aHint);
    CREATE_SHADOW(Painted);
    return layer.forget();
  }
}

void
ClientPaintedLayer::PrintInfo(std::stringstream& aStream, const char* aPrefix)
{
  PaintedLayer::PrintInfo(aStream, aPrefix);
  if (mContentClient) {
    aStream << "\n";
    nsAutoCString pfx(aPrefix);
    pfx += "  ";
    mContentClient->PrintInfo(aStream, pfx.get());
  }
}

} // namespace layers
} // namespace mozilla