gecko/image/ImageOps.cpp

/* -*- 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 "ImageOps.h"

#include "ClippedImage.h"
#include "DecodePool.h"
#include "Decoder.h"
#include "DecoderFactory.h"
#include "DynamicImage.h"
#include "FrozenImage.h"
#include "Image.h"
#include "imgIContainer.h"
#include "mozilla/gfx/2D.h"
#include "nsStreamUtils.h"
#include "OrientedImage.h"
#include "SourceBuffer.h"

using namespace mozilla::gfx;

namespace mozilla {
namespace image {

/* static */ already_AddRefed<Image>
ImageOps::Freeze(Image* aImage)
{
  nsRefPtr<Image> frozenImage = new FrozenImage(aImage);
  return frozenImage.forget();
}

/* static */ already_AddRefed<imgIContainer>
ImageOps::Freeze(imgIContainer* aImage)
{
  nsCOMPtr<imgIContainer> frozenImage =
    new FrozenImage(static_cast<Image*>(aImage));
  return frozenImage.forget();
}

/* static */ already_AddRefed<Image>
ImageOps::Clip(Image* aImage, nsIntRect aClip)
{
  nsRefPtr<Image> clippedImage = new ClippedImage(aImage, aClip);
  return clippedImage.forget();
}

/* static */ already_AddRefed<imgIContainer>
ImageOps::Clip(imgIContainer* aImage, nsIntRect aClip)
{
  nsCOMPtr<imgIContainer> clippedImage =
    new ClippedImage(static_cast<Image*>(aImage), aClip);
  return clippedImage.forget();
}

/* static */ already_AddRefed<Image>
ImageOps::Orient(Image* aImage, Orientation aOrientation)
{
  nsRefPtr<Image> orientedImage = new OrientedImage(aImage, aOrientation);
  return orientedImage.forget();
}

/* static */ already_AddRefed<imgIContainer>
ImageOps::Orient(imgIContainer* aImage, Orientation aOrientation)
{
  nsCOMPtr<imgIContainer> orientedImage =
    new OrientedImage(static_cast<Image*>(aImage), aOrientation);
  return orientedImage.forget();
}

/* static */ already_AddRefed<imgIContainer>
ImageOps::CreateFromDrawable(gfxDrawable* aDrawable)
{
  nsCOMPtr<imgIContainer> drawableImage = new DynamicImage(aDrawable);
  return drawableImage.forget();
}

/* static */ already_AddRefed<gfx::SourceSurface>
ImageOps::DecodeToSurface(nsIInputStream* aInputStream,
                          const nsACString& aMimeType,
                          uint32_t aFlags)
{
  MOZ_ASSERT(aInputStream);

  nsresult rv;

  // Prepare the input stream.
  nsCOMPtr<nsIInputStream> inputStream = aInputStream;
  if (!NS_InputStreamIsBuffered(aInputStream)) {
    nsCOMPtr<nsIInputStream> bufStream;
    rv = NS_NewBufferedInputStream(getter_AddRefs(bufStream),
                                   aInputStream, 1024);
    if (NS_SUCCEEDED(rv)) {
      inputStream = bufStream;
    }
  }

  // Figure out how much data we've been passed.
  uint64_t length;
  rv = inputStream->Available(&length);
  if (NS_FAILED(rv) || length > UINT32_MAX) {
    return nullptr;
  }

  // Write the data into a SourceBuffer.
  nsRefPtr<SourceBuffer> sourceBuffer = new SourceBuffer();
  sourceBuffer->ExpectLength(length);
  rv = sourceBuffer->AppendFromInputStream(inputStream, length);
  if (NS_FAILED(rv)) {
    return nullptr;
  }
  sourceBuffer->Complete(NS_OK);

  // Create a decoder.
  DecoderType decoderType =
    DecoderFactory::GetDecoderType(PromiseFlatCString(aMimeType).get());
  nsRefPtr<Decoder> decoder =
    DecoderFactory::CreateAnonymousDecoder(decoderType,
                                           sourceBuffer,
                                           ToSurfaceFlags(aFlags));
  if (!decoder) {
    return nullptr;
  }

  // Run the decoder synchronously.
  decoder->Decode();
  if (!decoder->GetDecodeDone() || decoder->HasError()) {
    return nullptr;
  }

  // Pull out the surface.
  RawAccessFrameRef frame = decoder->GetCurrentFrameRef();
  if (!frame) {
    return nullptr;
  }

  nsRefPtr<SourceSurface> surface = frame->GetSurface();
  if (!surface) {
    return nullptr;
  }

  return surface.forget();
}

} // namespace image
} // namespace mozilla