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fa360dba1b
It is useful/necessary for WebCodecs image decoding support to be able to calculate a frame count for the encoded image without actually decoding every frame. It needs to be able to provide results without the complete buffer as well. Differential Revision: https://phabricator.services.mozilla.com/D212831
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_DecoderFlags_h
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#define mozilla_image_DecoderFlags_h
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#include "mozilla/TypedEnumBits.h"
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namespace mozilla {
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namespace image {
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/**
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* Flags that influence decoder behavior. Note that these flags *don't*
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* influence the logical content of the surfaces that the decoder generates, so
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* they're not in a factor in SurfaceCache lookups and the like. These flags
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* instead either influence which surfaces are generated at all or the tune the
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* decoder's behavior for a particular scenario.
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*/
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enum class DecoderFlags : uint8_t {
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FIRST_FRAME_ONLY = 1 << 0,
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IS_REDECODE = 1 << 1,
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IMAGE_IS_TRANSIENT = 1 << 2,
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ASYNC_NOTIFY = 1 << 3,
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/**
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* By default, a surface is considered substitutable. That means callers are
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* willing to accept a less than ideal match to display. If a caller requires
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* a specific size and won't accept alternatives, then this flag should be
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* set.
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*/
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CANNOT_SUBSTITUTE = 1 << 4,
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#ifdef MOZ_AV1
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// The flags below are stored in RasterImage to allow a decoded image to
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// remain consistent in whether it is animated or not.
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// Set according to the "image.avif.sequence.enabled" preference.
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AVIF_SEQUENCES_ENABLED = 1 << 5,
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// Set according to the
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// "image.avif.sequence.animate_avif_major_branded_images" preference.
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AVIF_ANIMATE_AVIF_MAJOR = 1 << 6,
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#endif
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/**
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* By default, we don't count how many animated frames there are in an image,
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* as that would require us to iterate over the entire buffer for some image
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* formats. If the caller requires a full accounting of how many frames there
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* are.
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*/
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COUNT_FRAMES = 1 << 7,
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};
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(DecoderFlags)
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/**
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* @return the default set of decode flags.
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*/
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inline DecoderFlags DefaultDecoderFlags() { return DecoderFlags(); }
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_DecoderFlags_h
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