62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
/*
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* compile with:
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*
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* g++ -g -Wall buffer.cpp `pkg-config vips-cpp --cflags --libs`
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*
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*/
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#define DEBUG
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#include <vips/vips8>
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using namespace vips;
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int
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main( int argc, char **argv )
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{
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GOptionContext *context;
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GOptionGroup *main_group;
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GError *error = NULL;
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if( VIPS_INIT( argv[0] ) )
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vips_error_exit( NULL );
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context = g_option_context_new( "" );
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main_group = g_option_group_new( NULL, NULL, NULL, NULL, NULL );
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g_option_context_set_main_group( context, main_group );
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g_option_context_add_group( context, vips_get_option_group() );
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if( !g_option_context_parse( context, &argc, &argv, &error ) ) {
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if( error ) {
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fprintf( stderr, "%s\n", error->message );
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g_error_free( error );
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}
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vips_error_exit( NULL );
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}
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// load an image from a file
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VImage im = VImage::new_from_file( argv[1],
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VImage::option()->set( "access", "sequential-unbuffered" ) );
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printf( "loaded %d x %d pixel image from %s\n",
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im.width(), im.height(), argv[1] );
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// write to a formatted memory buffer
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size_t size;
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void *buf;
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im.write_to_buffer( ".png", &buf, &size );
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printf( "written to memory %p in png format, %zd bytes\n", buf, size );
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// load from the formatted memory area
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im = VImage::new_from_buffer( buf, size, "" );
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printf( "loaded from memory, %d x %d pixel image\n",
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im.width(), im.height() );
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// write back to a file
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im.write_to_file( argv[2] );
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printf( "written back to %s\n", argv[2] );
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return( 0 );
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}
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