4 Commits

Author	SHA1	Message	Date
Even Rouault	873004c615	Sub-tile decoding: speed up vertical pass in IDWT5x3 by processing 4 cols at a time	2017-09-01 16:31:00 +02:00
Even Rouault	b2cc8f7f81	Optimize reading/write into sparse array	2017-09-01 16:30:50 +02:00
Even Rouault	98b9310361	Various changes to allow tile buffers of more than 4giga pixels ... Untested though, since that means a tile buffer of at least 16 GB. So there might be places where uint32 overflow on multiplication still occur...	2017-09-01 16:30:44 +02:00
Even Rouault	f9e9942330	Sub-tile decoding: only allocate tile component buffer of the needed dimension ... Instead of being the full tile size. * Use a sparse array mechanism to store code-blocks and intermediate stages of IDWT. * IDWT, DC level shift and MCT stages are done just on that smaller array. * Improve copy of tile component array to final image, by saving an intermediate buffer. * For full-tile decoding at reduced resolution, only allocate the tile buffer to the reduced size, instead of the full-resolution size.	2017-09-01 16:30:29 +02:00