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/* -*- 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
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