if (parameters.numcomps) {
if (! opj_set_decoded_components(l_codec,
parameters.numcomps,
- parameters.comps_indices)) {
+ parameters.comps_indices,
+ OPJ_FALSE)) {
fprintf(stderr,
"ERROR -> opj_decompress: failed to set the component indices!\n");
opj_destroy_codec(l_codec);
OPJ_BOOL OPJ_CALLCONV opj_set_decoded_components(opj_codec_t *p_codec,
OPJ_UINT32 numcomps,
- const OPJ_UINT32* comps_indices)
+ const OPJ_UINT32* comps_indices,
+ OPJ_BOOL apply_color_transforms)
{
if (p_codec) {
opj_codec_private_t * l_codec = (opj_codec_private_t *) p_codec;
if (! l_codec->is_decompressor) {
+ opj_event_msg(&(l_codec->m_event_mgr), EVT_ERROR,
+ "Codec provided to the opj_set_decoded_components function is not a decompressor handler.\n");
+ return OPJ_FALSE;
+ }
+
+ if (apply_color_transforms) {
+ opj_event_msg(&(l_codec->m_event_mgr), EVT_ERROR,
+ "apply_color_transforms = OPJ_TRUE is not supported.\n");
return OPJ_FALSE;
}
*
* This function should be called after opj_read_header().
*
- * Normally all the components are decoded. This call enables to restrict
- * the set of decoded components to the specified indices.
- * Note that neither the MCT transform nor JP2 channel transformatios will be applied.
+ * This function enables to restrict the set of decoded components to the
+ * specified indices.
+ * Note that the current implementation (apply_color_transforms == OPJ_FALSE)
+ * is such that neither the multi-component transform at codestream level,
+ * nor JP2 channel transformations will be applied.
+ * Consequently the indices are relative to the codestream.
*
* Note: opj_decode_tile_data() should not be used together with opj_set_decoded_components().
*
* @param comps_indices Array of numcomps values representing the indices
* of the components to decode (relative to the
* codestream, starting at 0)
+ * @param apply_color_transforms Whether multi-component transform at codestream level
+ * or JP2 channel transformations should be applied.
+ * Currently this parameter should be set to OPJ_FALSE.
+ * Setting it to OPJ_TRUE will result in an error.
*
* @return OPJ_TRUE in case of success.
*/
OPJ_API OPJ_BOOL OPJ_CALLCONV opj_set_decoded_components(opj_codec_t *p_codec,
OPJ_UINT32 numcomps,
- const OPJ_UINT32* comps_indices);
+ const OPJ_UINT32* comps_indices,
+ OPJ_BOOL apply_color_transforms);
/**
* Sets the given area to be decoded. This function should be called right after opj_read_header and before any tile header reading.