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Side by Side Diff: src/images/SkImageDecoder_FactoryRegistrar.cpp

Issue 1830723002: Revert of Delete SkImageDecoder (Closed) Base URL: https://skia.googlesource.com/skia.git@fix-animator
Patch Set: Created 4 years, 9 months ago
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1 /*
2 * Copyright 2013 The Android Open Source Project
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
8 #include "SkErrorInternals.h"
9 #include "SkImageDecoder.h"
10 #include "SkStream.h"
11 #include "SkTRegistry.h"
12
13 // This file is used for registration of SkImageDecoders. It also holds a functi on
14 // for checking all the the registered SkImageDecoders for one that matches an
15 // input SkStreamRewindable.
16
17 template SkImageDecoder_DecodeReg* SkImageDecoder_DecodeReg::gHead;
18
19 SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);
20
21 SkImageDecoder* image_decoder_from_stream(SkStreamRewindable* stream) {
22 SkImageDecoder* codec = nullptr;
23 const SkImageDecoder_DecodeReg* curr = SkImageDecoder_DecodeReg::Head();
24 while (curr) {
25 codec = curr->factory()(stream);
26 // we rewind here, because we promise later when we call "decode", that
27 // the stream will be at its beginning.
28 bool rewindSuceeded = stream->rewind();
29
30 // our image decoder's require that rewind is supported so we fail early
31 // if we are given a stream that does not support rewinding.
32 if (!rewindSuceeded) {
33 SkDEBUGF(("Unable to rewind the image stream."));
34 delete codec;
35 return nullptr;
36 }
37
38 if (codec) {
39 return codec;
40 }
41 curr = curr->next();
42 }
43 return nullptr;
44 }
45
46 template SkImageDecoder_FormatReg* SkImageDecoder_FormatReg::gHead;
47
48 SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* strea m) {
49 const SkImageDecoder_FormatReg* curr = SkImageDecoder_FormatReg::Head();
50 while (curr != nullptr) {
51 Format format = curr->factory()(stream);
52 if (!stream->rewind()) {
53 SkErrorInternals::SetError(kInvalidOperation_SkError,
54 "Unable to rewind the image stream\n");
55 return kUnknown_Format;
56 }
57 if (format != kUnknown_Format) {
58 return format;
59 }
60 curr = curr->next();
61 }
62 return kUnknown_Format;
63 }
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