grk::StripPartitioner Class Reference

Computes strip geometry for cascade DWT at a given resolution. More...

#include <StripPartitioner.h>

Static Public Member Functions
static std::vector< StripGeometry >	partition (uint32_t resHeight, uint32_t sn, uint32_t dn, uint32_t parity, uint32_t stripeInterleaved=64, uint32_t halo=4)
	Compute strip geometries for a resolution level.
static void	findOverlappingBlocks (uint32_t bandY0, const SubbandRange &range, const std::vector< uint32_t > &blockY0s, const std::vector< uint32_t > &blockHeights, std::vector< uint32_t > &blockIndices)
	Find code blocks (by sub-band-relative y range) that overlap a sub-band range.

Detailed Description

Computes strip geometry for cascade DWT at a given resolution.

Given the resolution height, number of L/H sub-band rows, parity, and strip height, produces StripGeometry for each strip. This drives which code blocks need to be decoded for each strip.

Member Function Documentation

findOverlappingBlocks()

void grk::StripPartitioner::findOverlappingBlocks ( uint32_t bandY0, const SubbandRange & range, const std::vector< uint32_t > & blockY0s, const std::vector< uint32_t > & blockHeights, std::vector< uint32_t > & blockIndices )

inlinestatic

Find code blocks (by sub-band-relative y range) that overlap a sub-band range.

Parameters

	bandY0	Band origin in canvas coordinates
	range	Sub-band row range needed by the strip
	blockY0s	Sorted list of code block y-starts (canvas coords)
	blockHeights	Corresponding heights of each code block
[out]	blockIndices	Indices of overlapping blocks

References grk::SubbandRange::hi, and grk::SubbandRange::lo.

partition()

std::vector< StripGeometry > grk::StripPartitioner::partition ( uint32_t resHeight, uint32_t sn, uint32_t dn, uint32_t parity, uint32_t stripeInterleaved = 64, uint32_t halo = 4 )

inlinestatic

Compute strip geometries for a resolution level.

Parameters

resHeight	Total interleaved height of the resolution
sn	Number of L (low-pass) sub-band rows
dn	Number of H (high-pass) sub-band rows
parity	V-DWT parity (0 = even rows are L, 1 = even rows are H)
stripeInterleaved	Strip height in interleaved rows (default 64)
halo	Sub-band halo rows on each side (default 4 for 9/7)

Returns

Vector of StripGeometry, one per strip

References grk::StripGeometry::extFirst, grk::StripGeometry::extLast, grk::SubbandRange::hi, grk::SubbandRange::lo, grk::StripGeometry::localParity, grk::StripGeometry::outCount, grk::StripGeometry::outputStartInStripe, grk::StripGeometry::outStart, grk::StripGeometry::rangeH, and grk::StripGeometry::rangeL.

---

The documentation for this class was generated from the following file:

• StripPartitioner.h