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include "iralign.h"
# IR_INDICES -- Given the number in the list for a missing subraster and
# information about how the subrasters were written return the i and j
# indices of the specified subrasters.
procedure ir_indices (num, i, j, nxsub, nysub, corner, raster, order)
int num # number of the subraster
int i,j # indices of the subraster
int nxsub,nysub # number of subrasters in x and y
int corner # starting corner
int raster # raster order
int order # column or row order
begin
switch (corner) {
case IR_LL:
if (order == IR_ROW) {
if (mod (num, nxsub) == 0) {
j = num / nxsub
if (raster == YES && mod (j,2) == 0)
i = 1
else
i = nxsub
} else {
j = num / nxsub + 1
if (raster == YES && mod (j,2) == 0)
i = nxsub - mod (num, nxsub) + 1
else
i = mod (num, nxsub)
}
} else if (order == IR_COLUMN) {
if (mod (num, nysub) == 0) {
i = num / nysub
if (raster == YES && mod (i,2) == 0)
j = 1
else
j = nysub
} else {
i = num / nysub + 1
if (raster == YES && mod (i,2) == 0)
j = nysub - mod (num, nysub) + 1
else
j = mod (num, nysub)
}
}
case IR_LR:
if (order == IR_ROW) {
if (mod (num, nxsub) == 0) {
j = num / nxsub
if (raster == YES && mod (j,2) == 0)
i = nxsub
else
i = 1
} else {
j = num / nxsub + 1
if (raster == YES && mod (j,2) == 0)
i = mod (num, nxsub)
else
i = nxsub - mod (num, nxsub) + 1
}
} else if (order == IR_COLUMN) {
if (mod (num, nysub) == 0) {
i = nxsub - num / nysub + 1
if (raster == YES && mod (i,2) != 0)
j = 1
else
j = nysub
} else {
i = nxsub - num / nysub
if (raster == YES && mod (i,2) != 0)
j = nysub - mod (num, nysub) + 1
else
j = mod (num, nysub)
}
}
case IR_UL:
if (order == IR_ROW) {
if (mod (num, nxsub) == 0) {
j = nysub - num / nxsub + 1
if (raster == YES && mod (j,2) != 0)
i = 1
else
i = nxsub
} else {
j = nysub - num / nxsub
if (raster == YES && mod (j,2) != 0)
i = nxsub - mod (num, nxsub) + 1
else
i = mod (num, nxsub)
}
} else if (order == IR_COLUMN) {
if (mod (num, nysub) == 0) {
i = num / nysub
if (raster == YES && mod (i,2) == 0)
j = nysub
else
j = 1
} else {
i = num / nysub + 1
if (raster == YES && mod (i,2) == 0)
j = mod (num, nysub)
else
j = nysub - mod (num, nysub) + 1
}
}
case IR_UR:
if (order == IR_ROW) {
if (mod (num, nxsub) == 0) {
j = nysub - num / nxsub + 1
if (raster == YES && mod (j,2) != 0)
i = nxsub
else
i = 1
} else {
j = nysub - num / nxsub
if (raster == YES && mod (j,2) != 0)
i = mod (num, nxsub)
else
i = nxsub - mod (num, nxsub) + 1
}
} else if (order == IR_COLUMN) {
if (mod (num, nysub) == 0) {
i = nxsub - num / nysub + 1
if (raster == YES && mod (i,2) != 0)
j = nysub
else
j = 1
} else {
i = nxsub - num / nysub
if (raster == YES && mod (i,2) != 0)
j = mod (num, nysub)
else
j = nysub - mod (num, nysub) + 1
}
}
}
end
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