00001 // This is core/vil/vil_cached_image_resource.cxx 00002 #ifdef VCL_NEEDS_PRAGMA_INTERFACE 00003 #pragma implementation 00004 #endif 00005 00006 #include "vil_cached_image_resource.h" 00007 #include <vil/vil_image_view_base.h> 00008 00009 // Get a view that is the size of a block. 00010 // Uses the cache to retrieve frequently used blocks 00011 vil_image_view_base_sptr 00012 vil_cached_image_resource::get_block( unsigned block_index_i, 00013 unsigned block_index_j ) const 00014 { 00015 // check if the block is already in the buffer 00016 vil_image_view_base_sptr blk; 00017 if (cache_.get_block(block_index_i, block_index_j, blk)) 00018 return blk; 00019 // no - so get the block from the resource 00020 blk = bir_->get_block(block_index_i, block_index_j); 00021 if (!blk) 00022 return blk; // get block failed 00023 // put the block in the cache (cast away const since we are just caching) 00024 vil_cached_image_resource* non_const = (vil_cached_image_resource*)this; 00025 non_const->cache_.add_block(block_index_i, block_index_j, blk); 00026 return blk; 00027 } 00028
1.7.5.1