| 77 | } |
| 78 | |
| 79 | ImageSourcePng::ImageSourcePng( DataSourceRef dataSourceRef, ImageSource::Options /*options*/ ) |
| 80 | : ImageSource(), mInfoPtr( 0 ), mPngPtr( 0 ) |
| 81 | { |
| 82 | mPngPtr = png_create_read_struct( PNG_LIBPNG_VER_STRING, (png_voidp)NULL, NULL, NULL ); |
| 83 | if( ! mPngPtr ) { |
| 84 | throw ImageSourcePngException( "Could not create png struct." ); |
| 85 | } |
| 86 | |
| 87 | mCiInfoPtr = shared_ptr<ci_png_info>( new ci_png_info ); |
| 88 | mCiInfoPtr->srcStreamRef = dataSourceRef->createStream(); |
| 89 | |
| 90 | png_set_read_fn( mPngPtr, reinterpret_cast<void*>( mCiInfoPtr.get() ), ci_PNG_stream_reader ); |
| 91 | mInfoPtr = png_create_info_struct( mPngPtr ); |
| 92 | |
| 93 | if( ! mInfoPtr ) { |
| 94 | png_destroy_read_struct( &mPngPtr, (png_infopp)NULL, (png_infopp)NULL ); |
| 95 | mPngPtr = 0; |
| 96 | throw ImageSourcePngException( "Could not destroy png read struct." ); |
| 97 | } |
| 98 | |
| 99 | if( ! loadHeader() ) |
| 100 | throw ImageSourcePngException( "Could not load png header." ); |
| 101 | } |
| 102 | |
| 103 | // part of this being separated allows for us to play nicely with the setjmp of libpng |
| 104 | bool ImageSourcePng::loadHeader() |
nothing calls this directly
no test coverage detected