Kakadu Hyper-Doc (kdu_region

An object of this class provides a complete system for managing dynamic decompression, rendering and composition of JPEG2000 compressed imagery. This very powerful object is the workhorse of the "kdu_show" application, abstracting virtually all platform independent functionality.

The object can handle rendering of everything from a single component of a single raw code-stream, to the composition of multiple compositing layers from a JPX file. Moreover, it supports efficient scaling, rotation and dynamic region-based rendering.

The implementation is built on top of kdu_region_decompressor which supports only a single code-stream. Unlike that function, however, this object also abstracts all the machinery required for dynamic panning of a buffered surface over the composited image region.

When working with JPX sources, you may dynamically build up a composited image surface by adding and removing compositing layers. You may re-use layers which were partially decompressed in a previous composition, or you may recycle their resources immediately.

kdu_region_compositor (2 forms) {Java: Kdu_region_compositor}

~kdu_region_compositor [virtual] {Java: Native_destroy}

pre_destroy {Java: Pre_destroy}

set_error_level {Java: Set_error_level}

add_compositing_layer {Java: Add_compositing_layer}

remove_compositing_layer {Java: Remove_compositing_layer}

set_single_component {Java: Set_single_component}

cull_inactive_layers {Java: Cull_inactive_layers}

set_frame

set_scale {Java: Set_scale}

set_buffer_surface {Java: Set_buffer_surface}

map_region {Java: Map_region}