gvsig-raster / org.gvsig.jgdal / trunk / org.gvsig.jgdal / src / main / java / org / gvsig / jgdal / GdalRasterBand.java @ 839
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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package org.gvsig.jgdal; |
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/**
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* Representa a una banda simple de la im?gen o canal.
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*
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* @author Nacho Brodin (nachobrodin@gmail.com).<BR> Equipo de desarrollo gvSIG.<BR> http://www.gvsig.gva.es
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* @version 0.0
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* @link http://www.gvsig.gva.es
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*/
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public class GdalRasterBand extends JNIBase{ |
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private native long getOverviewNat(long cPtr,int i); |
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private native long getRasterColorTableNat(long cPtr); |
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private native GdalBuffer readRasterNat(long cPtr, |
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int nXOff, int nYOff, int nXSize, int nYSize, |
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int BufXSize, int BufYSize, |
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int eBufType);
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private native GdalBuffer readRasterWithPaletteNat(long cPtr, |
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int nXOff, int nYOff, int nXSize, int nYSize, |
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int BufXSize, int BufYSize, |
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int eBufType);
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private native void writeRasterNat( long cPtr, |
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int nXOff, int nYOff, int nXSize, int nYSize, |
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GdalBuffer buffer, |
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int eBufType);
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private native double getRasterNoDataValueNat(long cPtr); |
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private native int existsNoDataValueNat(long cPtr); |
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private native String[] getMetadataNat(long cPtr,String pszDomain); |
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private native int getRasterColorInterpretationNat(long cPtr); |
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private native int setRasterColorInterpretationNat(long cPtr, int bandType); |
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/**
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* Asigna el identificador de la banda
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*/
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public GdalRasterBand(long cPtr) { |
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this.cPtr=cPtr;
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} |
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/**
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* Lee datos de la banda de la imagen
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*
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* @return Devuelve un vector de bytes con el trozo de raster le?do.
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* @param nXOff El desplazamiento del pixel desde la esquina superior derecha
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* de la banda accedida.
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* @param nYOff El desplazamiento de l?nea desde la esquina superior derecha
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* de la banda accedida.
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* @param nXSize Ancho de la regi?n en pixels de la banda que ser? accedida
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* @param nYSize Altura de la regi?n en l?neas de la banda que ser? accedida
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* @param bufXSize Ancho del buffer donde la regi?n de la im?gen ser? guardada
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* @param bufYSize Altura del buffer donde la regi?n de la im?gen ser? guardada
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* En caso de que bufXSize o bufYSize sean menores que 1, pasan a tener el mismo valor que
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* nXSize y nYSize respectivamente para evitar buffers con tama?o 0.
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* @param eBufType
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*/
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public GdalBuffer readRaster(int nXOff, int nYOff, int nXSize, int nYSize, |
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int bufXSize, int bufYSize, |
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int eBufType)throws GdalException { |
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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if ((nXOff<0) || (nXOff > getRasterBandXSize()) || (nYOff < 0) || (nYOff > getRasterBandYSize())) |
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throw new GdalException("Desplazamiento de la ventana fuera de rango."); |
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if ((nXSize < 1) || (nXSize > getRasterBandXSize()) || (nYSize<1) || (nYSize > getRasterBandYSize())) |
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throw new GdalException("Tama?o de ventana incorrecto."); |
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if (((nXSize + nXOff) > (getRasterBandXSize())) || ((nYSize + nYOff) > (getRasterBandYSize())))
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throw new GdalException("Posicion de la ventana incorrecta."); |
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if ((eBufType < 1) || (eBufType > 11)) |
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throw new GdalException("Tipo de datos incorrecto."); |
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if (bufXSize < 1) |
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bufXSize = nXSize; |
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if (bufYSize < 1) |
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bufYSize = nYSize; |
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GdalBuffer buffer = readRasterNat(cPtr, nXOff, nYOff, nXSize, nYSize, bufXSize, bufYSize, eBufType); |
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if(buffer!=null) |
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return buffer;
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else
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return null; |
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} |
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/**
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* Escribe datos en la banda de la imagen
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*
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* @param nXOff El desplazamiento del pixel desde la esquina superior derecha
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* de la banda accedida.
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* @param nYOff El desplazamiento de l?nea desde la esquina superior derecha
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* de la banda accedida.
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* @param nXSize Ancho de la regi?n en pixels de la banda que ser? accedida
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* @param nYSize Altura de la regi?n en l?neas de la banda que ser? accedida
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* @param BufXSize Ancho del buffer donde la regi?n de la im?gen ser? guardada
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* @param BufYSize Altura del buffer donde la regi?n de la im?gen ser? guardada
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* @param eBufType
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*/
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public void writeRaster(int nXOff, int nYOff, int nXSize, int nYSize, GdalBuffer buf, int eBufType)throws GdalException { |
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GdalBuffer buffer = new GdalBuffer();
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if ((nXOff < 0) || (nXOff > getRasterBandXSize()) || (nYOff < 0) || (nYOff > getRasterBandYSize())) |
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throw new GdalException("Desplazamiento de la ventana fuera de rango."); |
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if ((nXSize < 1) || (nXSize > getRasterBandXSize()) || (nYSize < 1) || (nYSize > getRasterBandYSize())) |
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throw new GdalException("Tama?o de ventana incorrecto."); |
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if (((nXSize + nXOff) > (getRasterBandXSize())) || ((nYSize + nYOff) > (getRasterBandYSize())))
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throw new GdalException("Posicion de la ventana incorrecta."); |
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if ((eBufType < 1) || (eBufType > 11)) |
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throw new GdalException("Tipo de datos incorrecto."); |
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if (buf == null) |
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throw new GdalException("Buffer incorrecto"); |
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switch(eBufType) {
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case 0: |
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return;
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case 1: |
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buffer.buffByte = buf.buffByte; |
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break;
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case 2: |
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case 3: |
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case 8: |
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buffer.buffShort = buf.buffShort; |
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break;
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case 4: |
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case 5: |
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case 9: |
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buffer.buffInt = buf.buffInt; |
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break;
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case 6: |
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case 10: |
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buffer.buffFloat = buf.buffFloat; |
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break;
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case 7: |
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case 11: |
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buffer.buffDouble = buf.buffDouble; |
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break;
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case 12: |
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return;
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} |
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writeRasterNat(cPtr, nXOff, nYOff, nXSize, nYSize, buffer, eBufType); |
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} |
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/**
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*Obtiene el tama?o en pixeles de la im?gen en el eje de las X
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*@return Tama?o en pixeles del eje X
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*@throws GdalException
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*/
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public int getRasterBandXSize()throws GdalException { |
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String msg1="Error en getRasterBandXSize(). La llamada getRasterBand no tuvo exito"; |
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String msg2="Tama?o de banda erroneo devuelto por GetRasterBandXSize"; |
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return baseSimpleFunctions(0,msg1,msg2); |
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} |
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/**
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*Obtiene el tama?o en pixeles de la im?gen en el eje de las Y
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*@return Tama?o en pixeles del eje Y
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*@throws GdalException
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*/
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public int getRasterBandYSize()throws GdalException { |
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String msg1="Error en getRasterBandYSize(). La llamada getRasterBand no tuvo exito"; |
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String msg2="Tama?o de banda erroneo devuelto por GetRasterBandYSize"; |
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return baseSimpleFunctions(1,msg1,msg2); |
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} |
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/**
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* Devuelve el n?mero de overviews que contiene la banda.
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* @return N?mero de overviews
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* @throws GdalException
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*/
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public int getOverviewCount()throws GdalException { |
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String msg1="Error en getOverviewCount(). La llamada getRasterBand no tuvo exito"; |
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String msg2="Error al obtener el n?mero de overviews"; |
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return baseSimpleFunctions(2,msg1,msg2); |
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} |
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/**
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* Obtiene el overview indicado por el ?ndice "i".
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*
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* @param i indice del overview que se quiere recuperar.
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* @return GdalRasterBand Banda correspondiente al overview selecccionado
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* @throws GdalException
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*/
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public GdalRasterBand getOverview(int i)throws GdalException { |
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long cPtr_ov;
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if((i < 0) || (i >= getOverviewCount())) |
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throw new GdalException("El overview seleccionado no existe"); |
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cPtr_ov = getOverviewNat(cPtr,i); |
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if (cPtr_ov == 0) |
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throw new GdalException("No se ha podido obtener el overview"); |
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return new GdalRasterBand(cPtr_ov); |
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} |
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/**
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* Devuelve el tama?o en X del bloque para esa banda
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* @return Tama?o en pixeles del bloque en el eje X
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* @throws GdalException
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*/
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public int getBlockXSize()throws GdalException { |
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String msg1="Error en getBlockXSize(). La llamada getRasterBand no tuvo exito"; |
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String msg2="Tama?o de bloque erroneo devuelto por GetBlockXSize"; |
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return baseSimpleFunctions(3,msg1,msg2); |
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} |
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/**
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* Devuelve el tama?o en Y del bloque para esa banda
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* @return Tama?o en pixeles del bloque en el eje Y
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* @throws GdalException
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*/
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public int getBlockYSize()throws GdalException { |
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String msg1="Error en getBlockXSize(). La llamada getRasterBand no tuvo exito"; |
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String msg2="Tama?o de bloque erroneo devuelto por GetBlockYSize"; |
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return baseSimpleFunctions(4,msg1,msg2); |
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} |
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/**
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* Devuelve el tipo de datos de la banda
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* @return Tama?o en pixeles del bloque en el eje Y
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* @throws GdalException
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*/
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public int getRasterDataType()throws GdalException { |
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String msg1="Error en getRasterDataType(). La llamada getRasterBand no tuvo exito"; |
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String msg2="Tipo de dato devuelto por GetRasterDataType erroneo"; |
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return baseSimpleFunctions(9,msg1,msg2); |
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} |
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/**
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* Obtiene la tabla de color asociada a la imagen
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*/
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public GdalColorTable getRasterColorTable()throws GdalException { |
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GdalColorTable gct = null;
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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long cPtr_ct = getRasterColorTableNat(cPtr);
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if ((cPtr_ct == 0) || (cPtr_ct == -1)) |
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return null; |
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gct = new GdalColorTable(cPtr_ct);
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return gct;
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} |
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/**
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* Lee datos de la banda de la im?gen con una paleta asociada
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*
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* @return Devuelve un vector de bytes con el trozo de raster le?do.
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* @param nXOff El desplazamiento del pixel desde la esquina superior derecha
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* de la banda accedida.
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* @param nYOff El desplazamiento de l?nea desde la esquina superior derecha
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* de la banda accedida.
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* @param nXSize Ancho de la regi?n en pixels de la banda que ser? accedida
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* @param nYSize Altura de la regi?n en l?neas de la banda que ser? accedida
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* @param BufXSize Ancho del buffer donde la regi?n de la im?gen ser? guardada
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* @param BufYSize Altura del buffer donde la regi?n de la im?gen ser? guardada
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* En caso de que bufXSize o bufYSize sean menores que 1, pasan a tener el mismo valor que
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* nXSize y nYSize respectivamente para evitar buffers con tama?o 0.
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* @param eBufType
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*/
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public GdalBuffer readRasterWithPalette(int nXOff, int nYOff, int nXSize, int nYSize, |
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int bufXSize, int bufYSize, |
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int eBufType)throws GdalException { |
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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if ((nXOff<0) || (nXOff > getRasterBandXSize()) || (nYOff < 0) || (nYOff > getRasterBandYSize())) |
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throw new GdalException("Desplazamiento de la ventana fuera de rango."); |
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if ((nXSize < 1) || (nXSize > getRasterBandXSize()) || (nYSize < 1) || (nYSize > getRasterBandYSize())) |
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throw new GdalException("Tama?o de ventana incorrecto."); |
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if (((nXSize + nXOff) > (getRasterBandXSize())) || ((nYSize + nYOff) > (getRasterBandYSize())))
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throw new GdalException("Posicion de la ventana incorrecta."); |
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if ((eBufType < 1) || (eBufType > 11)) |
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throw new GdalException("Tipo de datos incorrecto."); |
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if (bufXSize < 1) |
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bufXSize = nXSize; |
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if (bufYSize < 1) |
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bufYSize = nYSize; |
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GdalBuffer buffer = readRasterWithPaletteNat(cPtr, nXOff, nYOff, nXSize, nYSize, bufXSize, bufYSize, eBufType); |
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if(buffer!=null) |
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return buffer;
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else
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return null; |
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} |
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/**
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*Devuelve el valor de NoData
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*/
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public double getRasterNoDataValue()throws GdalException { |
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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return getRasterNoDataValueNat(cPtr);
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} |
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/**
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* Obtiene el valorDevuelve el valor de NoData
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*/
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public boolean existsNoDataValue()throws GdalException { |
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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int result = existsNoDataValueNat(cPtr);
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if(result == 1) |
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return true; |
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else
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return false; |
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} |
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/**
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* Obtiene un array de Strings con los metadatos
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*
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* @throws GdalException
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* @return Array de Strings que corresponden a los metadatos que ofrece la im?gen
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*/
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public String[] getMetadata()throws GdalException { |
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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String[] res = getMetadataNat(cPtr,null); |
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if(res == null) |
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return new String[0]; |
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else return res; |
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} |
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/**
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* Obtiene identificador que representa el tipo de banda de color.
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* @return identificador del tipo de banda de color
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* @throws GdalException
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*/
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public int getRasterColorInterpretation()throws GdalException { |
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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int bandType = getRasterColorInterpretationNat(cPtr);
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return bandType;
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} |
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/**
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* Asigna la interpretaci?n de color de la banda.
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* Con algunos formatos no es posible modificar la interpretaci?n de color,
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* tales como tiff y jpg. En el caso de tif, no hay error pero tampoco se
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* produce el cambio en la interpretaci?n. En el caso de jpg, gdal lanza un error.
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* 0 = "Undefined"
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* 1 = "Gray";
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* 2 = "Palette";
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* 3 = "Red";
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* 4 = "Green";
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* 5 = "Blue";
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* 6 = "Alpha";
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* 7 = "Hue";
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* 8 = "Saturation";
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* 9 = "Lightness";
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* 10 = "Cyan";
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* 11 = "Magenta";
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* 12 = "Yellow";
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* 13 = "Black";
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* 14 = "YCbCr_Y";
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* 15 = "YCbCr_Cb";
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* 16 = "YCbCr_Cr";
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* @param bandType
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* @throws GdalException
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*/
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public void setRasterColorInterpretation(int bandType) throws GdalException{ |
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if (cPtr == 0) |
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throw new GdalException("No se ha podido acceder al archivo."); |
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if ((bandType < 0) || (bandType > 16)){ |
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throw new GdalException("Tipo de banda incorrecto"); |
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} |
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int err = setRasterColorInterpretationNat(cPtr, bandType);
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} |
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} |