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37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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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/** @file
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* An enumeration used by RasterImage and Decoder to specify which 'strategy' to
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* use for image decoding - synchronous or asynchronous.
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*/
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#ifndef mozilla_imagelib_DecodeStrategy_h_
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#define mozilla_imagelib_DecodeStrategy_h_
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namespace mozilla {
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namespace image {
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enum DecodeStrategy {
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// DECODE_SYNC requests a synchronous decode, which will continue decoding
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// frames as long as it has more source data. It returns to the caller only
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// once decoding is complete (or until it needs more source data before
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// continuing). Because DECODE_SYNC can involve allocating new imgFrames, it
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// can only be run on the main thread.
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DECODE_SYNC,
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// DECODE_ASYNC requests an asynchronous decode, which will continue decoding
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// until it either finishes a frame or runs out of source data. Because
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// DECODE_ASYNC does not allocate new imgFrames, it can be safely run off the
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// main thread. (And hence workers in the decode pool always use it.)
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DECODE_ASYNC
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};
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} // namespace image
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} // namespace mozilla
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#endif
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