/src/mozilla-central/image/SurfaceFlags.h
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1 | | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
3 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
4 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
5 | | |
6 | | #ifndef mozilla_image_SurfaceFlags_h |
7 | | #define mozilla_image_SurfaceFlags_h |
8 | | |
9 | | #include "imgIContainer.h" |
10 | | #include "mozilla/TypedEnumBits.h" |
11 | | |
12 | | namespace mozilla { |
13 | | namespace image { |
14 | | |
15 | | /** |
16 | | * Flags that change the output a decoder generates. Because different |
17 | | * combinations of these flags result in logically different surfaces, these |
18 | | * flags must be taken into account in SurfaceCache lookups. |
19 | | */ |
20 | | enum class SurfaceFlags : uint8_t |
21 | | { |
22 | | NO_PREMULTIPLY_ALPHA = 1 << 0, |
23 | | NO_COLORSPACE_CONVERSION = 1 << 1 |
24 | | }; |
25 | | MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(SurfaceFlags) |
26 | | |
27 | | /** |
28 | | * @return the default set of surface flags. |
29 | | */ |
30 | | inline SurfaceFlags |
31 | | DefaultSurfaceFlags() |
32 | 0 | { |
33 | 0 | return SurfaceFlags(); |
34 | 0 | } |
35 | | |
36 | | /** |
37 | | * Given a set of imgIContainer FLAG_* flags, returns a set of SurfaceFlags with |
38 | | * the corresponding flags set. |
39 | | */ |
40 | | inline SurfaceFlags |
41 | | ToSurfaceFlags(uint32_t aFlags) |
42 | 0 | { |
43 | 0 | SurfaceFlags flags = DefaultSurfaceFlags(); |
44 | 0 | if (aFlags & imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA) { |
45 | 0 | flags |= SurfaceFlags::NO_PREMULTIPLY_ALPHA; |
46 | 0 | } |
47 | 0 | if (aFlags & imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION) { |
48 | 0 | flags |= SurfaceFlags::NO_COLORSPACE_CONVERSION; |
49 | 0 | } |
50 | 0 | return flags; |
51 | 0 | } |
52 | | |
53 | | /** |
54 | | * Given a set of SurfaceFlags, returns a set of imgIContainer FLAG_* flags with |
55 | | * the corresponding flags set. |
56 | | */ |
57 | | inline uint32_t |
58 | | FromSurfaceFlags(SurfaceFlags aFlags) |
59 | 0 | { |
60 | 0 | uint32_t flags = imgIContainer::DECODE_FLAGS_DEFAULT; |
61 | 0 | if (aFlags & SurfaceFlags::NO_PREMULTIPLY_ALPHA) { |
62 | 0 | flags |= imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA; |
63 | 0 | } |
64 | 0 | if (aFlags & SurfaceFlags::NO_COLORSPACE_CONVERSION) { |
65 | 0 | flags |= imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION; |
66 | 0 | } |
67 | 0 | return flags; |
68 | 0 | } |
69 | | |
70 | | } // namespace image |
71 | | } // namespace mozilla |
72 | | |
73 | | #endif // mozilla_image_SurfaceFlags_h |