image/SurfaceFlags.h
author Cameron McCormack <cam@mcc.id.au>
Fri, 21 Dec 2018 05:37:58 +0000
changeset 451647 84931341bac16f5c047f137fffd9c69bb05a7a77
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1515800 - Rename some more GetCurrentTime methods to avoid winbase.h bustage r=birtles,bzbarsky Differential Revision: https://phabricator.services.mozilla.com/D15167

/* -*- 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/. */

#ifndef mozilla_image_SurfaceFlags_h
#define mozilla_image_SurfaceFlags_h

#include "imgIContainer.h"
#include "mozilla/TypedEnumBits.h"

namespace mozilla {
namespace image {

/**
 * Flags that change the output a decoder generates. Because different
 * combinations of these flags result in logically different surfaces, these
 * flags must be taken into account in SurfaceCache lookups.
 */
enum class SurfaceFlags : uint8_t {
  NO_PREMULTIPLY_ALPHA = 1 << 0,
  NO_COLORSPACE_CONVERSION = 1 << 1
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(SurfaceFlags)

/**
 * @return the default set of surface flags.
 */
inline SurfaceFlags DefaultSurfaceFlags() { return SurfaceFlags(); }

/**
 * Given a set of imgIContainer FLAG_* flags, returns a set of SurfaceFlags with
 * the corresponding flags set.
 */
inline SurfaceFlags ToSurfaceFlags(uint32_t aFlags) {
  SurfaceFlags flags = DefaultSurfaceFlags();
  if (aFlags & imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA) {
    flags |= SurfaceFlags::NO_PREMULTIPLY_ALPHA;
  }
  if (aFlags & imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION) {
    flags |= SurfaceFlags::NO_COLORSPACE_CONVERSION;
  }
  return flags;
}

/**
 * Given a set of SurfaceFlags, returns a set of imgIContainer FLAG_* flags with
 * the corresponding flags set.
 */
inline uint32_t FromSurfaceFlags(SurfaceFlags aFlags) {
  uint32_t flags = imgIContainer::DECODE_FLAGS_DEFAULT;
  if (aFlags & SurfaceFlags::NO_PREMULTIPLY_ALPHA) {
    flags |= imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
  }
  if (aFlags & SurfaceFlags::NO_COLORSPACE_CONVERSION) {
    flags |= imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION;
  }
  return flags;
}

}  // namespace image
}  // namespace mozilla

#endif  // mozilla_image_SurfaceFlags_h