1 /* libs/graphics/ports/SkImageDecoder_Factory.cpp
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include "SkImageDecoder.h"
19 #include "SkMovie.h"
20 #include "SkStream.h"
21 #include "SkTRegistry.h"
22
23 typedef SkTRegistry<SkImageDecoder*, SkStream*> DecodeReg;
24
25 template DecodeReg* DecodeReg::gHead;
26
Factory(SkStream * stream)27 SkImageDecoder* SkImageDecoder::Factory(SkStream* stream) {
28 const DecodeReg* curr = DecodeReg::Head();
29 while (curr) {
30 SkImageDecoder* codec = curr->factory()(stream);
31 // we rewind here, because we promise later when we call "decode", that
32 // the stream will be at its beginning.
33 stream->rewind();
34 if (codec) {
35 return codec;
36 }
37 curr = curr->next();
38 }
39 return NULL;
40 }
41
42 /////////////////////////////////////////////////////////////////////////
43
44 typedef SkTRegistry<SkMovie*, SkStream*> MovieReg;
45
DecodeStream(SkStream * stream)46 SkMovie* SkMovie::DecodeStream(SkStream* stream) {
47 const MovieReg* curr = MovieReg::Head();
48 while (curr) {
49 SkMovie* movie = curr->factory()(stream);
50 if (movie) {
51 return movie;
52 }
53 // we must rewind only if we got NULL, since we gave the stream to the
54 // movie, who may have already started reading from it
55 stream->rewind();
56 curr = curr->next();
57 }
58 return NULL;
59 }
60
61