blob: 9ed17e0f67eaf47cdefd71099d28658f65eb1e5a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/*
* Copyright 2013 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkErrorInternals.h"
#include "SkImageDecoder.h"
#include "SkStream.h"
#include "SkTRegistry.h"
// This file is used for registration of SkImageDecoders. It also holds a function
// for checking all the the registered SkImageDecoders for one that matches an
// input SkStream.
template SkImageDecoder_DecodeReg* SkImageDecoder_DecodeReg::gHead;
SkImageDecoder* image_decoder_from_stream(SkStream*);
SkImageDecoder* image_decoder_from_stream(SkStream* stream) {
SkImageDecoder* codec = NULL;
const SkImageDecoder_DecodeReg* curr = SkImageDecoder_DecodeReg::Head();
while (curr) {
codec = curr->factory()(stream);
// we rewind here, because we promise later when we call "decode", that
// the stream will be at its beginning.
bool rewindSuceeded = stream->rewind();
// our image decoder's require that rewind is supported so we fail early
// if we are given a stream that does not support rewinding.
if (!rewindSuceeded) {
SkDEBUGF(("Unable to rewind the image stream."));
SkDELETE(codec);
return NULL;
}
if (codec) {
return codec;
}
curr = curr->next();
}
return NULL;
}
template SkImageDecoder_FormatReg* SkImageDecoder_FormatReg::gHead;
SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStream* stream) {
const SkImageDecoder_FormatReg* curr = SkImageDecoder_FormatReg::Head();
while (curr != NULL) {
Format format = curr->factory()(stream);
if (!stream->rewind()) {
SkErrorInternals::SetError(kInvalidOperation_SkError,
"Unable to rewind the image stream\n");
return kUnknown_Format;
}
if (format != kUnknown_Format) {
return format;
}
curr = curr->next();
}
return kUnknown_Format;
}
|
