gecko/image/src/Image.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 "nsMimeTypes.h"

#include "Image.h"

namespace mozilla {
namespace image {

// Constructor
ImageResource::ImageResource(ImageURL* aURI) :
  mURI(aURI),
  mInnerWindowId(0),
  mAnimationConsumers(0),
  mAnimationMode(kNormalAnimMode),
  mInitialized(false),
  mAnimating(false),
  mError(false)
{
}

uint32_t
ImageResource::SizeOfData()
{
  if (mError)
    return 0;

  // This is not used by memory reporters, but for sizing the cache, which is
  // why it uses |moz_malloc_size_of| rather than a
  // |MOZ_DEFINE_MALLOC_SIZE_OF|.
  return uint32_t(HeapSizeOfSourceWithComputedFallback(moz_malloc_size_of) +
                  HeapSizeOfDecodedWithComputedFallback(moz_malloc_size_of) +
                  NonHeapSizeOfDecoded() +
                  OutOfProcessSizeOfDecoded());
}

// Translates a mimetype into a concrete decoder
Image::eDecoderType
Image::GetDecoderType(const char *aMimeType)
{
  // By default we don't know
  eDecoderType rv = eDecoderType_unknown;

  // PNG
  if (!strcmp(aMimeType, IMAGE_PNG))
    rv = eDecoderType_png;
  else if (!strcmp(aMimeType, IMAGE_X_PNG))
    rv = eDecoderType_png;

  // GIF
  else if (!strcmp(aMimeType, IMAGE_GIF))
    rv = eDecoderType_gif;


  // JPEG
  else if (!strcmp(aMimeType, IMAGE_JPEG))
    rv = eDecoderType_jpeg;
  else if (!strcmp(aMimeType, IMAGE_PJPEG))
    rv = eDecoderType_jpeg;
  else if (!strcmp(aMimeType, IMAGE_JPG))
    rv = eDecoderType_jpeg;

  // BMP
  else if (!strcmp(aMimeType, IMAGE_BMP))
    rv = eDecoderType_bmp;
  else if (!strcmp(aMimeType, IMAGE_BMP_MS))
    rv = eDecoderType_bmp;


  // ICO
  else if (!strcmp(aMimeType, IMAGE_ICO))
    rv = eDecoderType_ico;
  else if (!strcmp(aMimeType, IMAGE_ICO_MS))
    rv = eDecoderType_ico;

  // Icon
  else if (!strcmp(aMimeType, IMAGE_ICON_MS))
    rv = eDecoderType_icon;

  return rv;
}

void
ImageResource::IncrementAnimationConsumers()
{
  MOZ_ASSERT(NS_IsMainThread(), "Main thread only to encourage serialization "
                                "with DecrementAnimationConsumers");
  mAnimationConsumers++;
}

void
ImageResource::DecrementAnimationConsumers()
{
  MOZ_ASSERT(NS_IsMainThread(), "Main thread only to encourage serialization "
                                "with IncrementAnimationConsumers");
  NS_ABORT_IF_FALSE(mAnimationConsumers >= 1, "Invalid no. of animation consumers!");
  mAnimationConsumers--;
}

nsresult
ImageResource::GetAnimationModeInternal(uint16_t* aAnimationMode)
{
  if (mError)
    return NS_ERROR_FAILURE;

  NS_ENSURE_ARG_POINTER(aAnimationMode);

  *aAnimationMode = mAnimationMode;
  return NS_OK;
}

nsresult
ImageResource::SetAnimationModeInternal(uint16_t aAnimationMode)
{
  if (mError)
    return NS_ERROR_FAILURE;

  NS_ASSERTION(aAnimationMode == kNormalAnimMode ||
               aAnimationMode == kDontAnimMode ||
               aAnimationMode == kLoopOnceAnimMode,
               "Wrong Animation Mode is being set!");

  mAnimationMode = aAnimationMode;

  return NS_OK;
}

void
ImageResource::EvaluateAnimation()
{
  if (!mAnimating && ShouldAnimate()) {
    nsresult rv = StartAnimation();
    mAnimating = NS_SUCCEEDED(rv);
  } else if (mAnimating && !ShouldAnimate()) {
    StopAnimation();
  }
}

} // namespace image
} // namespace mozilla