public RenderedImage decodeAsRenderedImage(int page) throws IOException {
if (page != 0) {
throw new IOException(JaiI18N.getString(JaiI18N.getString("WBMPImageDecoder0")));
}
input.read(); // TypeField
input.read(); // FixHeaderField
// Image width
int value = input.read();
int width = value & 0x7f;
while ((value & 0x80) == 0x80) {
width <<= 7;
value = input.read();
width |= (value & 0x7f);
}
// Image height
value = input.read();
int height = value & 0x7f;
while ((value & 0x80) == 0x80) {
height <<= 7;
value = input.read();
height |= (value & 0x7f);
}
// Create byte-packed bilevel image width an IndexColorModel
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_BINARY);
// Get the image tile.
WritableRaster tile = bi.getWritableTile(0, 0);
// Get the SampleModel.
MultiPixelPackedSampleModel sm = (MultiPixelPackedSampleModel) bi.getSampleModel();
// Read the data.
input.readFully(
((DataBufferByte) tile.getDataBuffer()).getData(), 0, height * sm.getScanlineStride());
return bi;
}
/**
* Constructs a BytePackedRaster with the given SampleModel, DataBuffer, and parent. DataBuffer
* must be a DataBufferByte and SampleModel must be of type MultiPixelPackedSampleModel. When
* translated into the base Raster's coordinate system, aRegion must be contained by the base
* Raster. Origin is the coordinate in the new Raster's coordinate system of the origin of the
* base Raster. (The base Raster is the Raster's ancestor which has no parent.)
*
* <p>Note that this constructor should generally be called by other constructors or create
* methods, it should not be used directly.
*
* @param sampleModel The SampleModel that specifies the layout.
* @param dataBuffer The DataBufferShort that contains the image data.
* @param aRegion The Rectangle that specifies the image area.
* @param origin The Point that specifies the origin.
* @param parent The parent (if any) of this raster.
* @exception RasterFormatException if the parameters do not conform to requirements of this
* Raster type.
*/
public BytePackedRaster(
SampleModel sampleModel,
DataBuffer dataBuffer,
Rectangle aRegion,
Point origin,
BytePackedRaster parent) {
super(sampleModel, dataBuffer, aRegion, origin, parent);
this.maxX = minX + width;
this.maxY = minY + height;
if (!(dataBuffer instanceof DataBufferByte)) {
throw new RasterFormatException("BytePackedRasters must have" + "byte DataBuffers");
}
DataBufferByte dbb = (DataBufferByte) dataBuffer;
this.data = stealData(dbb, 0);
if (dbb.getNumBanks() != 1) {
throw new RasterFormatException(
"DataBuffer for BytePackedRasters" + " must only have 1 bank.");
}
int dbOffset = dbb.getOffset();
if (sampleModel instanceof MultiPixelPackedSampleModel) {
MultiPixelPackedSampleModel mppsm = (MultiPixelPackedSampleModel) sampleModel;
this.type = IntegerComponentRaster.TYPE_BYTE_BINARY_SAMPLES;
pixelBitStride = mppsm.getPixelBitStride();
if (pixelBitStride != 1 && pixelBitStride != 2 && pixelBitStride != 4) {
throw new RasterFormatException("BytePackedRasters must have a bit depth of 1, 2, or 4");
}
scanlineStride = mppsm.getScanlineStride();
dataBitOffset = mppsm.getDataBitOffset() + dbOffset * 8;
int xOffset = aRegion.x - origin.x;
int yOffset = aRegion.y - origin.y;
dataBitOffset += xOffset * pixelBitStride + yOffset * scanlineStride * 8;
bitMask = (1 << pixelBitStride) - 1;
shiftOffset = 8 - pixelBitStride;
} else {
throw new RasterFormatException(
"BytePackedRasters must have" + "MultiPixelPackedSampleModel");
}
verify(false);
}
/** Constructs a DirectRasterAccessor object */
public DirectRasterAccessor(Raster raster, ColorModel cm) {
DataBuffer db = raster.getDataBuffer();
offsetX = raster.getMinX() - raster.getSampleModelTranslateX();
offsetY = raster.getMinY() - raster.getSampleModelTranslateY();
if (!(db instanceof DataBufferByte)) {
throw new RuntimeException(
"DataBuffer of Raster not of correct type "
+ "(expected DataBufferByte, got "
+ db.getClass().getName()
+ ")");
}
DataBufferByte dbb = (DataBufferByte) db;
SampleModel sm = raster.getSampleModel();
if (!(sm instanceof MultiPixelPackedSampleModel)) {
throw new RuntimeException(
"SampleModel of Raster not of correct type "
+ "(expected MultiPixelPackedSampleModel, got "
+ sm.getClass().getName()
+ ")");
}
MultiPixelPackedSampleModel mppsm = (MultiPixelPackedSampleModel) sm;
data = dbb.getData();
scanlineStride = mppsm.getScanlineStride();
if (cm.getRGB(0) == Color.white.getRGB()) {
white = 0;
black = 1;
} else {
white = 1;
black = 0;
}
}
