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Add capability to decode only a subset of all components of an image. #1022

Merged
merged 2 commits into from
Sep 26, 2017
Merged

Add capability to decode only a subset of all components of an image. #1022

merged 2 commits into from
Sep 26, 2017

Commits on Sep 19, 2017

  1. Add capability to decode only a subset of all components of an image. 

    This adds a opj_set_decoded_components(opj_codec_t *p_codec,
OPJ_UINT32 numcomps, const OPJ_UINT32* comps_indices) function,
and equivalent "opj_decompress -c compno[,compno]*" option.

When specified, neither the MCT transform nor JP2 channel transformations
will be applied.

Tests added for various combinations of whole image vs tiled-based decoding,
full or reduced resolution, use of decode area or not.
    @rouault
    rouault committed Sep 19, 2017
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  2. opj_set_decoded_components(): add a provision for a apply_color_trans… 

    …forms parameter in case we support it in the future
    @rouault
    rouault committed Sep 19, 2017
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