Application: gvSIG desktop » gvSIG raster

	/**

	 * Reads a window of data. The size of the input window may not coincide 

	 * with the size of the buffer. In that case would have to resize

	 * @param buf

	 * @param bandList

	 * @param x

	 *        Initial X position in input buffer

	 * @param y

	 *        Initial Y position in input buffer

	 * @throws MrSIDException

	 * @throws ProcessInterruptedException

	 */

	public void readWindow(Buffer buf, 

			BandList bandList, 

			int x, int y, int w, int h, 

			int bufWidth, int bufHeight) throws MrSIDException, ProcessInterruptedException {

		if(bufWidth > buf.getWidth())

			bufWidth = buf.getWidth();

		if(bufHeight > buf.getHeight())

			bufHeight = buf.getHeight();

		if(buf.isCached()) {

			int nBlocks = (int)(bufHeight / buf.getBlockHeight());

			int lastBlock = bufHeight - (nBlocks * buf.getBlockHeight());

			int lastBlockSrc = (lastBlock * h) / bufHeight;

			int sizeBlockSrc = (buf.getBlockHeight() * h) / bufHeight;

			if(lastBlock > 0)

				nBlocks ++;

			int initSrc = y;

			int init = 0;

			for (int i = 0; i < nBlocks; i++) {

				if(lastBlock > 0 && i == (nBlocks - 1)) {

					double[] stepSrc = new double[]{x, initSrc, w, lastBlockSrc};

					int[] stepDst = new int[]{0, init, bufWidth, init + lastBlock};

					readWindowInMemory(buf, bandList, stepSrc, stepDst, w, lastBlock);

				} else {

					double[] stepSrc = new double[]{x, initSrc, w, sizeBlockSrc};

					int[] stepDst = new int[]{0, init, bufWidth, init + buf.getBlockHeight()};

					readWindowInMemory(buf, bandList, stepSrc, stepDst, w, buf.getBlockHeight());

					init += buf.getBlockHeight();

					initSrc += sizeBlockSrc;

				}

			}

		} else {

			readWindowInMemory(buf, bandList, x, y, w, h);

		}

	}

	/**

	 * Reads a window of data. The width and height is indicated by the size of the buffer 

	 * @param buf

	 * @param bandList

	 * @param x

	 *        Initial X position in input buffer

	 * @param y

	 *        Initial Y position in input buffer

	 * @throws MrSIDException

	 * @throws ProcessInterruptedException

	 */

	public void readWindow(Buffer buf, BandList bandList, int x, int y) throws MrSIDException, ProcessInterruptedException {

		int w = (x + buf.getWidth()) > getWidth() ? getWidth() - x : buf.getWidth();

		int h = (y + buf.getHeight()) > getHeight() ? getHeight() - y : buf.getHeight();

		if(buf.isCached()) {

			int nBlocks = (int)(buf.getHeight() / buf.getBlockHeight());

			int lastBlock = buf.getHeight() - (nBlocks * buf.getBlockHeight());

			if(lastBlock > 0)

				nBlocks ++;

			int init = 0;

			for (int i = 0; i < nBlocks; i++) {

				if(lastBlock > 0 && i == (nBlocks - 1)) {

					double[] stepSrc = new double[]{x, init, w, lastBlock};

					int[] stepDst = new int[]{0, init, w, init + lastBlock};

					readWindowInMemory(buf, bandList, stepSrc, stepDst, w, lastBlock);

				} else {

					double[] stepSrc = new double[]{x, init, w, buf.getBlockHeight()};

					int[] stepDst = new int[]{0, init, w, init + buf.getBlockHeight()};

					readWindowInMemory(buf, bandList, stepSrc, stepDst, w, buf.getBlockHeight());

					init += buf.getBlockHeight();

				}

			}

		} else {

			readWindowInMemory(buf, bandList, x, y, w, h);

		}

	}

	private void readWindowInMemory(Buffer buf, BandList bandList, double[] srcPxPos, int[] stepDst, int sizeSrcX, int sizeSrcY) throws MrSIDException, ProcessInterruptedException {

		RasterTask task = RasterTaskQueue.get(Thread.currentThread().toString());

		isSupersampling = false;

		LTISceneBuffer buffer = ((LTIImageStage) this).readScene(

					srcPxPos[0], srcPxPos[1], srcPxPos[2], srcPxPos[3], 

					1.0, 

					(MrSIDImageReader)this, 

					sizeSrcX, sizeSrcY, 

					true);

		byte[] bandBuf = null;

		for(int iBand = 0; iBand < getNumBands(); iBand++) {

			int[] drawableBands = bandList.getBufferBandToDraw(fileName, iBand);

			if(drawableBands == null || (drawableBands.length == 1 && drawableBands[0] == -1))

				continue;

			switch(iBand) {

			case 0:  bandBuf = buffer.buf1; break;

			case 1:  bandBuf = buffer.buf2; break;

			case 2:  bandBuf = buffer.buf3; break;

			}

			int lineSrc = 0;

			for (int line = stepDst[1]; line < stepDst[3]; line++) {

				int colSrc = 0;

				for (int col = stepDst[0]; col < stepDst[2]; col++) {

					int kd = (int)((lineSrc * srcPxPos[2]) + colSrc);

					buf.setElem(line, col, iBand, (byte)bandBuf[kd]);

					colSrc ++;

				}

				lineSrc ++;

				if(task.getEvent() != null)

					task.manageEvent(task.getEvent());

			}

		}

	}

	private void readWindowInMemory(Buffer buf, BandList bandList, int x, int y, int w, int h) throws MrSIDException, ProcessInterruptedException {