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/* libs/graphics/ports/SkImageDecoder_Factory.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "SkImageDecoder.h"
#include "SkMovie.h"
#include "SkStream.h"
#include "SkTRegistry.h"
typedef SkTRegistry<SkImageDecoder*, SkStream*> DecodeReg;
// N.B. You can't use "DecodeReg::gHead here" due to complex C++
// corner cases.
template DecodeReg* SkTRegistry<SkImageDecoder*, SkStream*>::gHead;
#ifdef SK_ENABLE_LIBPNG
extern SkImageDecoder* sk_libpng_dfactory(SkStream*);
#endif
SkImageDecoder* SkImageDecoder::Factory(SkStream* stream) {
SkImageDecoder* codec = NULL;
const DecodeReg* curr = 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.
stream->rewind();
if (codec) {
return codec;
}
curr = curr->next();
}
#ifdef SK_ENABLE_LIBPNG
codec = sk_libpng_dfactory(stream);
stream->rewind();
if (codec) {
return codec;
}
#endif
return NULL;
}
/////////////////////////////////////////////////////////////////////////
typedef SkTRegistry<SkMovie*, SkStream*> MovieReg;
SkMovie* SkMovie::DecodeStream(SkStream* stream) {
const MovieReg* curr = MovieReg::Head();
while (curr) {
SkMovie* movie = curr->factory()(stream);
if (movie) {
return movie;
}
// we must rewind only if we got NULL, since we gave the stream to the
// movie, who may have already started reading from it
stream->rewind();
curr = curr->next();
}
return NULL;
}
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