/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.imaging.formats.tiff.datareaders;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.ByteOrder;
import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.common.ImageBuilder;
import org.apache.commons.imaging.formats.tiff.TiffDirectory;
import org.apache.commons.imaging.formats.tiff.TiffElement.DataElement;
import org.apache.commons.imaging.formats.tiff.TiffImageData;
import org.apache.commons.imaging.formats.tiff.photometricinterpreters.PhotometricInterpreter;
import org.apache.commons.imaging.formats.tiff.photometricinterpreters.PhotometricInterpreterRgb;
public final class DataReaderTiled extends DataReader {
private final int tileWidth;
private final int tileLength;
private final int bitsPerPixel;
private final int compression;
private final ByteOrder byteOrder;
private final TiffImageData.Tiles imageData;
public DataReaderTiled(final TiffDirectory directory,
final PhotometricInterpreter photometricInterpreter, final int tileWidth,
final int tileLength, final int bitsPerPixel, final int[] bitsPerSample,
final int predictor, final int samplesPerPixel, final int width, final int height,
final int compression, final ByteOrder byteOrder, final TiffImageData.Tiles imageData) {
super(directory, photometricInterpreter, bitsPerSample, predictor,
samplesPerPixel, width, height);
this.tileWidth = tileWidth;
this.tileLength = tileLength;
this.bitsPerPixel = bitsPerPixel;
this.compression = compression;
this.imageData = imageData;
this.byteOrder = byteOrder;
}
private void interpretTile(final ImageBuilder imageBuilder, final byte[] bytes,
final int startX, final int startY, final int xLimit, final int yLimit) throws ImageReadException, IOException {
// changes introduced May 2012
// The following block of code implements changes that
// reduce image loading time by using special-case processing
// instead of the general-purpose logic from the original
// implementation. For a detailed discussion, see the comments for
// a similar treatment in the DataReaderStrip class
//
// verify that all samples are one byte in size
boolean allSamplesAreOneByte = true;
for (final int element : bitsPerSample) {
if (element != 8) {
allSamplesAreOneByte = false;
break;
}
}
if (predictor != 2 && bitsPerPixel == 24 && allSamplesAreOneByte) {
int k = 0;
final int i0 = startY;
int i1 = startY + tileLength;
if (i1 > yLimit) {
// the tile is padded past bottom of image
i1 = yLimit;
}
final int j0 = startX;
int j1 = startX + tileWidth;
if (j1 > xLimit) {
// the tile is padded to beyond the tile width
j1 = xLimit;
}
if (photometricInterpreter instanceof PhotometricInterpreterRgb) {
for (int i = i0; i < i1; i++) {
k = (i - i0) * tileWidth * 3;
for (int j = j0; j < j1; j++, k += 3) {
final int rgb = 0xff000000
| (((bytes[k] << 8) | (bytes[k + 1] & 0xff)) << 8)
| (bytes[k + 2] & 0xff);
imageBuilder.setRGB(j, i, rgb);
}
}
} else {
final int[] samples = new int[3];
for (int i = i0; i < i1; i++) {
k = (i - i0) * tileWidth * 3;
for (int j = j0; j < j1; j++) {
samples[0] = bytes[k++] & 0xff;
samples[1] = bytes[k++] & 0xff;
samples[2] = bytes[k++] & 0xff;
photometricInterpreter.interpretPixel(imageBuilder,
samples, j, i);
}
}
}
return;
}
// End of May 2012 changes
final ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
final BitInputStream bis = new BitInputStream(bais, byteOrder);
final int pixelsPerTile = tileWidth * tileLength;
int tileX = 0;
int tileY = 0;
int[] samples = new int[bitsPerSample.length];
resetPredictor();
for (int i = 0; i < pixelsPerTile; i++) {
final int x = tileX + startX;
final int y = tileY + startY;
getSamplesAsBytes(bis, samples);
if ((x < xLimit) && (y < yLimit)) {
samples = applyPredictor(samples);
photometricInterpreter.interpretPixel(imageBuilder, samples, x,
y);
}
tileX++;
if (tileX >= tileWidth) {
tileX = 0;
resetPredictor();
tileY++;
bis.flushCache();
if (tileY >= tileLength) {
break;
}
}
}
}
@Override
public void readImageData(final ImageBuilder imageBuilder)
throws ImageReadException, IOException {
final int bitsPerRow = tileWidth * bitsPerPixel;
final int bytesPerRow = (bitsPerRow + 7) / 8;
final int bytesPerTile = bytesPerRow * tileLength;
int x = 0;
int y = 0;
for (final DataElement tile2 : imageData.tiles) {
final byte[] compressed = tile2.getData();
final byte[] decompressed = decompress(compressed, compression,
bytesPerTile, tileWidth, tileLength);
interpretTile(imageBuilder, decompressed, x, y, width, height);
x += tileWidth;
if (x >= width) {
x = 0;
y += tileLength;
if (y >= height) {
break;
}
}
}
}
@Override
public BufferedImage readImageData(final Rectangle subImage)
throws ImageReadException, IOException
{
final int bitsPerRow = tileWidth * bitsPerPixel;
final int bytesPerRow = (bitsPerRow + 7) / 8;
final int bytesPerTile = bytesPerRow * tileLength;
int x = 0;
int y = 0;
// tileWidth is the width of the tile
// tileLength is the height of the tile
final int col0 = subImage.x / tileWidth;
final int col1 = (subImage.x + subImage.width - 1) / tileWidth;
final int row0 = subImage.y / tileLength;
final int row1 = (subImage.y + subImage.height - 1) / tileLength;
final int nCol = col1 - col0 + 1;
final int nRow = row1 - row0 + 1;
final int workingWidth = nCol * tileWidth;
final int workingHeight = nRow * tileLength;
final int nColumnsOfTiles = (width + tileWidth - 1) / tileWidth;
final int x0 = col0 * tileWidth;
final int y0 = row0 * tileLength;
final ImageBuilder workingBuilder =
new ImageBuilder(workingWidth, workingHeight, false);
for (int iRow = row0; iRow <= row1; iRow++) {
for (int iCol = col0; iCol <= col1; iCol++) {
final int tile = iRow * nColumnsOfTiles + iCol;
final byte[] compressed = imageData.tiles[tile].getData();
final byte[] decompressed = decompress(compressed, compression,
bytesPerTile, tileWidth, tileLength);
x = iCol * tileWidth - x0;
y = iRow * tileLength - y0;
interpretTile(workingBuilder, decompressed, x, y, workingWidth, workingHeight);
}
}
if (subImage.x == x0
&& subImage.y == y0
&& subImage.width == workingWidth
&& subImage.height == workingHeight) {
return workingBuilder.getBufferedImage();
}
return workingBuilder.getSubimage(
subImage.x - x0,
subImage.y - y0,
subImage.width,
subImage.height);
}
}