image/DecoderFlags.h
author Tooru Fujisawa <arai_a@mac.com>
Wed, 13 Mar 2019 02:46:12 +0000
changeset 521645 c1e2b7779d6a13626b13bbb1916f8819756a19ff
parent 505383 6f3709b3878117466168c40affa7bca0b60cf75b
child 523590 52390d9090fbd8d46b00ea29034e7039511ff8a4
permissions -rw-r--r--
Bug 1505343 - Part 1: Rename binsource => binast. r=Yoric Differential Revision: https://phabricator.services.mozilla.com/D23097

/* -*- 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_DecoderFlags_h
#define mozilla_image_DecoderFlags_h

#include "mozilla/TypedEnumBits.h"

namespace mozilla {
namespace image {

/**
 * Flags that influence decoder behavior. Note that these flags *don't*
 * influence the logical content of the surfaces that the decoder generates, so
 * they're not in a factor in SurfaceCache lookups and the like. These flags
 * instead either influence which surfaces are generated at all or the tune the
 * decoder's behavior for a particular scenario.
 */
enum class DecoderFlags : uint8_t {
  FIRST_FRAME_ONLY = 1 << 0,
  IS_REDECODE = 1 << 1,
  IMAGE_IS_TRANSIENT = 1 << 2,
  ASYNC_NOTIFY = 1 << 3,

  /**
   * By default, a surface is considered substitutable. That means callers are
   * willing to accept a less than ideal match to display. If a caller requires
   * a specific size and won't accept alternatives, then this flag should be
   * set.
   */
  CANNOT_SUBSTITUTE = 1 << 4,

  /**
   * By default, an animation decoder will produce partial frames that need to
   * be combined with the previously displayed/composited frame by FrameAnimator
   * to produce a complete frame. If this flag is set, the decoder will perform
   * this blending at decode time, and the frames produced are complete.
   */
  BLEND_ANIMATION = 1 << 5
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(DecoderFlags)

/**
 * @return the default set of decode flags.
 */
inline DecoderFlags DefaultDecoderFlags() { return DecoderFlags(); }

}  // namespace image
}  // namespace mozilla

#endif  // mozilla_image_DecoderFlags_h