| /* 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; |
| } |