inherit image_types

# This sets the granularity of the sparse image conversion. Chunk sizes will be
# specified in units of this value. Setting this value smaller than the
# underlying image's block size will not result in any further space saving.
# However, there is no loss in correctness if this value is larger or smaller
# than optimal. This value should be a power of two.
SPARSE_BLOCK_SIZE ??= "4096"

CONVERSIONTYPES += "sparse"
CONVERSION_CMD:sparse() {
    INPUT="${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}"
    truncate --no-create --size=%${SPARSE_BLOCK_SIZE} "$INPUT"
    img2simg -s "$INPUT" "$INPUT.sparse" ${SPARSE_BLOCK_SIZE}
}
CONVERSION_DEPENDS_sparse = "android-tools-native"