private void readBandRasterDataSubSampling(
Band sourceBand,
int sourceOffsetX,
int sourceOffsetY,
int sourceWidth,
int sourceHeight,
int sourceStepX,
int sourceStepY,
ProductData destBuffer,
int destWidth,
ProgressMonitor pm)
throws IOException {
final int sourceMinY = sourceOffsetY;
final int sourceMaxY = sourceOffsetY + sourceHeight - 1;
ProductData lineBuffer = ProductData.createInstance(destBuffer.getType(), sourceWidth);
int destPos = 0;
try {
pm.beginTask("Reading sub sampled raster data...", 2 * (sourceMaxY - sourceMinY));
for (int sourceY = sourceMinY; sourceY <= sourceMaxY; sourceY += sourceStepY) {
sourceBand.readRasterData(
sourceOffsetX, sourceY, sourceWidth, 1, lineBuffer, SubProgressMonitor.create(pm, 1));
if (sourceStepX == 1) {
copyData(lineBuffer, 0, destBuffer, destPos, destWidth);
} else {
copyLine(lineBuffer, 0, sourceWidth, sourceStepX, destBuffer, destPos);
}
pm.worked(1);
destPos += destWidth;
}
} finally {
pm.done();
}
}
private void readBandRasterDataRegion(
Band sourceBand,
int sourceOffsetX,
int sourceOffsetY,
int sourceWidth,
int sourceHeight,
ProductData destBuffer,
ProgressMonitor pm)
throws IOException {
sourceBand.readRasterData(
sourceOffsetX, sourceOffsetY, sourceWidth, sourceHeight, destBuffer, pm);
}