/* -*- 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 "PaintedLayerMLGPU.h"

#include "LayerManagerMLGPU.h"

#include "mozilla/layers/LayersHelpers.h"

#include "mozilla/layers/TiledContentHost.h"

#include "UnitTransforms.h"

namespace mozilla {

using namespace gfx;

namespace layers {

PaintedLayerMLGPU::PaintedLayerMLGPU(LayerManagerMLGPU* aManager)

 : PaintedLayer(aManager, static_cast<HostLayer*>(this)),

   LayerMLGPU(aManager)

{

  MOZ_COUNT_CTOR(PaintedLayerMLGPU);

}

PaintedLayerMLGPU::~PaintedLayerMLGPU()

{

  MOZ_COUNT_DTOR(PaintedLayerMLGPU);

  CleanupResources();

}

bool

PaintedLayerMLGPU::OnPrepareToRender(FrameBuilder* aBuilder)

{

  // Reset our cached texture pointers. The next call to AssignToView will

  // populate them again.

  mTexture = nullptr;

  mTextureOnWhite = nullptr;

  return !!mHost;

}

void

PaintedLayerMLGPU::SetRenderRegion(LayerIntRegion&& aRegion)

{

  mRenderRegion = std::move(aRegion);

  LayerIntRect bounds(mRenderRegion.GetBounds().TopLeft(),

                      ViewAs<LayerPixel>(mTexture->GetSize()));

  mRenderRegion.AndWith(bounds);

}

const LayerIntRegion&

PaintedLayerMLGPU::GetDrawRects()

{

#ifndef MOZ_IGNORE_PAINT_WILL_RESAMPLE

  // Note: we don't set PaintWillResample on our ContentTextureHost. The old

  // compositor must do this since ContentHost is responsible for issuing

  // draw calls, but in AL we can handle it directly here.

  //

  // Note that when AL performs CPU-based occlusion culling (the default

  // behavior), we might break up the visible region again. If that turns

  // out to be a problem, we can factor this into ForEachDrawRect instead.

  if (MayResample()) {

    mDrawRects = mRenderRegion.GetBounds();

    return mDrawRects;

  }

#endif

  return mRenderRegion;

}

bool

PaintedLayerMLGPU::SetCompositableHost(CompositableHost* aHost)

{

  switch (aHost->GetType()) {

    case CompositableType::CONTENT_TILED:

    case CompositableType::CONTENT_SINGLE:

    case CompositableType::CONTENT_DOUBLE:

      mHost = aHost->AsContentHost();

      if (!mHost) {

        gfxWarning() << "ContentHostBase is not a ContentHostTexture";

      }

      return true;

    default:

      return false;

  }

}

CompositableHost*

PaintedLayerMLGPU::GetCompositableHost()

{

  return mHost;

}

gfx::Point

PaintedLayerMLGPU::GetDestOrigin() const

{

  return mDestOrigin;

}

void

PaintedLayerMLGPU::AssignToView(FrameBuilder* aBuilder,

                                RenderViewMLGPU* aView,

                                Maybe<Polygon>&& aGeometry)

{

  if (TiledContentHost* tiles = mHost->AsTiledContentHost()) {

    // Note: we do not support the low-res buffer yet.

    MOZ_ASSERT(tiles->GetLowResBuffer().GetTileCount() == 0);

    AssignHighResTilesToView(aBuilder, aView, tiles, aGeometry);

    return;

  }

  // If we don't have a texture yet, acquire one from the ContentHost now.

  if (!mTexture) {

    ContentHostTexture* single = mHost->AsContentHostTexture();

    if (!single) {

      return;

    }

    mTexture = single->AcquireTextureSource();

    if (!mTexture) {

      return;

    }

    mTextureOnWhite = single->AcquireTextureSourceOnWhite();

    mDestOrigin = single->GetOriginOffset();

  }

  // Fall through to the single texture case.

  LayerMLGPU::AssignToView(aBuilder, aView, std::move(aGeometry));

}

void

PaintedLayerMLGPU::AssignHighResTilesToView(FrameBuilder* aBuilder,

                                            RenderViewMLGPU* aView,

                                            TiledContentHost* aTileHost,

                                            const Maybe<Polygon>& aGeometry)

{

  TiledLayerBufferComposite& tiles = aTileHost->GetHighResBuffer();

  LayerIntRegion compositeRegion = ViewAs<LayerPixel>(tiles.GetValidRegion());

  compositeRegion.AndWith(GetShadowVisibleRegion());

  if (compositeRegion.IsEmpty()) {

    return;

  }

  AssignTileBufferToView(aBuilder, aView, tiles, compositeRegion, aGeometry);

}

void

PaintedLayerMLGPU::AssignTileBufferToView(FrameBuilder* aBuilder,

                                          RenderViewMLGPU* aView,

                                          TiledLayerBufferComposite& aTiles,

                                          const LayerIntRegion& aCompositeRegion,

                                          const Maybe<Polygon>& aGeometry)

{

  float resolution = aTiles.GetResolution();

  // Save these so they can be restored at the end.

  float baseOpacity = mComputedOpacity;

  LayerIntRegion visible = GetShadowVisibleRegion();

  for (size_t i = 0; i < aTiles.GetTileCount(); i++) {

    TileHost& tile = aTiles.GetTile(i);

    if (tile.IsPlaceholderTile()) {

      continue;

    }

    TileCoordIntPoint coord =  aTiles.GetPlacement().TileCoord(i);

    // A sanity check that catches a lot of mistakes.

    MOZ_ASSERT(coord.x == tile.mTileCoord.x && coord.y == tile.mTileCoord.y);

    IntPoint offset = aTiles.GetTileOffset(coord);

    // Use LayerIntRect here so we don't have to keep re-allocating the region

    // to change the unit type.

    LayerIntRect tileRect(ViewAs<LayerPixel>(offset),

                          ViewAs<LayerPixel>(aTiles.GetScaledTileSize()));

    LayerIntRegion tileDrawRegion = tileRect;

    tileDrawRegion.AndWith(aCompositeRegion);

    if (tileDrawRegion.IsEmpty()) {

      continue;

    }

    tileDrawRegion.ScaleRoundOut(resolution, resolution);

    // Update layer state for this tile - that includes the texture, visible

    // region, and opacity.

    mTexture = tile.AcquireTextureSource();

    if (!mTexture) {

      continue;

    }

    mTextureOnWhite = tile.AcquireTextureSourceOnWhite();

    SetShadowVisibleRegion(tileDrawRegion);

    mComputedOpacity = tile.GetFadeInOpacity(baseOpacity);

    mDestOrigin = offset;

    // Yes, it's a bit weird that we're assigning the same layer to the same

    // view multiple times. Note that each time, the texture, computed

    // opacity, origin, and visible region are updated to match the current

    // tile, and we restore these properties after we've finished processing

    // all tiles.

    Maybe<Polygon> geometry = aGeometry;

    LayerMLGPU::AssignToView(aBuilder, aView, std::move(geometry));

  }

  // Restore the computed opacity and visible region.

  mComputedOpacity = baseOpacity;

  SetShadowVisibleRegion(std::move(visible));

}

void

PaintedLayerMLGPU::CleanupResources()

{

  if (mHost) {

    mHost->Detach(this);

  }

  mTexture = nullptr;

  mTextureOnWhite = nullptr;

  mHost = nullptr;

}

void

PaintedLayerMLGPU::PrintInfo(std::stringstream& aStream, const char* aPrefix)

{

  PaintedLayer::PrintInfo(aStream, aPrefix);

  if (mHost && mHost->IsAttached()) {

    aStream << "\n";

    nsAutoCString pfx(aPrefix);

    pfx += "  ";

    mHost->PrintInfo(aStream, pfx.get());

  }

}

void

PaintedLayerMLGPU::Disconnect()

{

  CleanupResources();

}

bool

PaintedLayerMLGPU::IsContentOpaque()

{

  return !!(GetContentFlags() & CONTENT_OPAQUE);

}

void

PaintedLayerMLGPU::CleanupCachedResources()

{

  CleanupResources();

}

} // namespace layers

} // namespace mozilla