1 /*
2 * Copyright 2023 Google LLC
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7 #ifndef SkRawDecoder_DEFINED
8 #define SkRawDecoder_DEFINED
9
10 #include "include/codec/SkCodec.h"
11 #include "include/core/SkRefCnt.h"
12 #include "include/private/base/SkAPI.h"
13
14 class SkData;
15 class SkStream;
16
17 #include <memory>
18
19 namespace SkRawDecoder {
20
IsRaw(const void *,size_t)21 inline bool IsRaw(const void*, size_t) {
22 // Raw formats are tricky to detect just by reading in the first several bytes.
23 // For example, PIEX might need to read 10k bytes to detect Sony's arw format
24 // https://github.com/google/piex/blob/f1e15dd837c04347504149f71db67a78fbeddc73/src/image_type_recognition/image_type_recognition_lite.cc#L152
25 // Thus, we just assume everything might be a RAW file and check it last.
26 return true;
27 }
28
29 /**
30 * Attempts to decode the given bytes as a raw image.
31 *
32 * If the bytes are not a raw, returns nullptr.
33 *
34 * DecodeContext is ignored
35 */
36 SK_API std::unique_ptr<SkCodec> Decode(std::unique_ptr<SkStream>,
37 SkCodec::Result*,
38 SkCodecs::DecodeContext = nullptr);
39 SK_API std::unique_ptr<SkCodec> Decode(sk_sp<SkData>,
40 SkCodec::Result*,
41 SkCodecs::DecodeContext = nullptr);
42
43 // This decoder will always be checked last, no matter when it is registered.
Decoder()44 inline constexpr SkCodecs::Decoder Decoder() {
45 return { "raw", IsRaw, Decode };
46 }
47
48 } // namespace SkRawDecoder
49
50 #endif // SkRawDecoder_DEFINED
51