IIOUtil.java
/*
* Copyright (c) 2009, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.imageio.util;
import com.twelvemonkeys.image.ImageUtil;
import com.twelvemonkeys.lang.Validate;
import javax.imageio.IIOParam;
import javax.imageio.ImageIO;
import javax.imageio.spi.IIOServiceProvider;
import javax.imageio.spi.ServiceRegistry;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.*;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* IIOUtil
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author: haraldk$
* @version $Id: IIOUtil.java,v 1.0 May 8, 2008 3:04:54 PM haraldk Exp$
*/
public final class IIOUtil {
private IIOUtil() {}
/**
* Creates an {@code InputStream} adapter that reads from an underlying {@code ImageInputStream}.
* The input stream will read until the end of {@code pStream}.
*
* @param pStream the stream to read from.
* @return an {@code InputStream} reading from {@code pStream}.
*/
public static InputStream createStreamAdapter(final ImageInputStream pStream) {
// TODO: Include stream start pos?
// TODO: Skip buffering for known in-memory implementations?
return new BufferedInputStream(new IIOInputStreamAdapter(pStream));
}
/**
* Creates an {@code InputStream} adapter that reads from an underlying {@code ImageInputStream}.
* The input stream will read until the end of {@code pStream}, or at most {@code pLength} bytes has been read.
*
* @param pStream the stream to read from.
* @param pLength the maximum number of bytes that can be read from {@code pStream}.
* @return an {@code InputStream} reading from {@code pStream}.
*/
public static InputStream createStreamAdapter(final ImageInputStream pStream, final long pLength) {
// TODO: Include stream start pos?
// TODO: Skip buffering for known in-memory implementations?
return new BufferedInputStream(new IIOInputStreamAdapter(pStream, pLength));
}
/**
* Creates an {@code OutputStream} adapter that writes to an underlying {@code ImageOutputStream}.
* <p>
* Note: The adapter is buffered, and <em>MUST</em> be properly flushed/closed after use,
* otherwise data may be lost.
* </p>
*
* @param pStream the stream to write to.
* @return an {@code OutputSteam} writing to {@code pStream}.
*/
public static OutputStream createStreamAdapter(final ImageOutputStream pStream) {
return new BufferedOutputStream(new IIOOutputStreamAdapter(pStream));
}
public static Image fakeSubsampling(final Image pImage, final IIOParam pParam) {
if (pImage == null) {
return null;
}
if (pParam != null) {
int x = pParam.getSourceXSubsampling();
int y = pParam.getSourceYSubsampling();
// 1 is default
if (x > 1 || y > 1) {
int w = (ImageUtil.getWidth(pImage) + x - 1) / x;
int h = (ImageUtil.getHeight(pImage) + y - 1) / y;
// Fake subsampling by scaling fast
return pImage.getScaledInstance(w, h, Image.SCALE_FAST);
}
}
return pImage;
}
public static Rectangle getSourceRegion(final IIOParam pParam, final int pSrcWidth, final int pSrcHeight) {
Rectangle sourceRegion = new Rectangle(pSrcWidth, pSrcHeight);
// If param is present, calculate region
if (pParam != null) {
// Get intersection with source region
Rectangle region = pParam.getSourceRegion();
if (region != null) {
sourceRegion = sourceRegion.intersection(region);
}
// Scale according to subsampling offsets
int subsampleXOffset = pParam.getSubsamplingXOffset();
int subsampleYOffset = pParam.getSubsamplingYOffset();
sourceRegion.x += subsampleXOffset;
sourceRegion.y += subsampleYOffset;
sourceRegion.width -= subsampleXOffset;
sourceRegion.height -= subsampleYOffset;
}
return sourceRegion;
}
public static BufferedImage fakeAOI(final BufferedImage pImage, final Rectangle pSourceRegion) {
if (pImage == null) {
return null;
}
if (pSourceRegion != null
&& (pSourceRegion.x != 0 || pSourceRegion.y != 0 || pSourceRegion.width != pImage.getWidth() || pSourceRegion.height != pImage.getHeight())) {
return pImage.getSubimage(pSourceRegion.x, pSourceRegion.y, pSourceRegion.width, pSourceRegion.height);
}
return pImage;
}
/**
* THIS METHOD WILL BE MOVED/RENAMED, DO NOT USE.
*
* @param registry the registry to unregister from.
* @param provider the provider to unregister.
* @param category the category to unregister from.
*/
public static <T> void deregisterProvider(final ServiceRegistry registry, final IIOServiceProvider provider, final Class<T> category) {
registry.deregisterServiceProvider(category.cast(provider), category);
}
/**
* THIS METHOD WILL BE MOVED/RENAMED, DO NOT USE.
*
* @param registry the registry to lookup from.
* @param providerClassName name of the provider class.
* @param category provider category
*
* @return the provider instance, or {@code null} if not found
*/
public static <T> T lookupProviderByName(final ServiceRegistry registry, final String providerClassName, Class<T> category) {
// NOTE: While more verbose, this is more OSGi-friendly than using
// registry.getServiceProviderByClass(Class.forName(providerClassName))
Iterator<T> providers = registry.getServiceProviders(category, true);
while (providers.hasNext()) {
T provider = providers.next();
if (provider.getClass().getName().equals(providerClassName)) {
return provider;
}
}
return null;
}
/**
* Returns a sorted array of format names, that can be read by ImageIO.
* The names are all upper-case, and contains no duplicates.
*
* @return a normalized array of {@code String}s.
* @see ImageIO#getReaderFormatNames()
*/
public static String[] getNormalizedReaderFormatNames() {
return normalizeNames(ImageIO.getReaderFormatNames());
}
/**
* Returns a sorted array of format names, that can be written by ImageIO.
* The names are all upper-case, and contains no duplicates.
*
* @return a normalized array of {@code String}s.
* @see ImageIO#getWriterFormatNames()
*/
public static String[] getNormalizedWriterFormatNames() {
return normalizeNames(ImageIO.getWriterFormatNames());
}
private static String[] normalizeNames(final String[] names) {
SortedSet<String> normalizedNames = new TreeSet<>();
for (String name : names) {
normalizedNames.add(name.toUpperCase());
}
return normalizedNames.toArray(new String[0]);
}
// TODO: RasterUtils? Subsampler?
public static void subsampleRow(byte[] srcRow, int srcPos, int srcWidth,
byte[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
// Period == 1 is a no-op...
if (samplePeriod == 1) {
if (srcRow != destRow) {
System.arraycopy(srcRow, srcPos, destRow, destPos, srcWidth);
}
return;
}
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1");
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 8 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 8 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");
Validate.isTrue(samplesPerPixel * bitsPerSample <= 8 || samplesPerPixel * bitsPerSample % 8 == 0,
"samplesPerPixel * bitsPerSample must be < 8 or a multiple of 8 ");
if (bitsPerSample * samplesPerPixel % 8 == 0) {
int pixelStride = bitsPerSample * samplesPerPixel / 8;
for (int x = 0; x < srcWidth * pixelStride; x += samplePeriod * pixelStride) {
// System.arraycopy should be intrinsic, but consider using direct array access for pixelStride == 1
System.arraycopy(srcRow, srcPos + x, destRow, destPos + x / samplePeriod, pixelStride);
}
}
else {
// Start bit fiddling...
int pixelStride = bitsPerSample * samplesPerPixel;
int mask = (1 << pixelStride) - 1;
for (int x = 0; x < srcWidth; x += samplePeriod) {
int dstOff = (destPos + x / samplePeriod) * pixelStride / 8;
int srcOff = (srcPos + x) * pixelStride / 8;
int srcBitPos = 8 - pixelStride - (x * pixelStride) % 8;
int srcMask = mask << srcBitPos;
int dstBitPos = 8 - pixelStride - (x * pixelStride / samplePeriod) % 8;
int dstMask = ~(mask << dstBitPos);
int val = ((srcRow[srcOff] & srcMask) >> srcBitPos);
destRow[dstOff] = (byte) ((destRow[dstOff] & dstMask) | val << dstBitPos);
}
}
}
public static void subsampleRow(short[] srcRow, int srcPos, int srcWidth,
short[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
// Period == 1 is a no-op...
if (samplePeriod == 1) {
if (srcRow != destRow) {
System.arraycopy(srcRow, srcPos, destRow, destPos, srcWidth);
}
return;
}
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1");
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 16 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 16 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");
Validate.isTrue(samplesPerPixel * bitsPerSample <= 16 || samplesPerPixel * bitsPerSample % 16 == 0,
"samplesPerPixel * bitsPerSample must be < 16 or a multiple of 16");
int pixelStride = bitsPerSample * samplesPerPixel / 16;
for (int x = 0; x < srcWidth * pixelStride; x += samplePeriod * pixelStride) {
// System.arraycopy should be intrinsic, but consider using direct array access for pixelStride == 1
System.arraycopy(srcRow, srcPos + x, destRow, destPos + x / samplePeriod, pixelStride);
}
}
public static void subsampleRow(int[] srcRow, int srcPos, int srcWidth,
int[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
// Period == 1 is a no-op...
if (samplePeriod == 1) {
if (srcRow != destRow) {
System.arraycopy(srcRow, srcPos, destRow, destPos, srcWidth);
}
return;
}
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1");
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 32 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 32 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");
Validate.isTrue(samplesPerPixel * bitsPerSample <= 32 || samplesPerPixel * bitsPerSample % 32 == 0,
"samplesPerPixel * bitsPerSample must be < 32 or a multiple of 32");
int pixelStride = bitsPerSample * samplesPerPixel / 32;
for (int x = 0; x < srcWidth * pixelStride; x += samplePeriod * pixelStride) {
// System.arraycopy should be intrinsic, but consider using direct array access for pixelStride == 1
System.arraycopy(srcRow, srcPos + x, destRow, destPos + x / samplePeriod, pixelStride);
}
}
public static void subsampleRow(float[] srcRow, int srcPos, int srcWidth,
float[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1"); // Period == 1 could be a no-op...
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 32 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 32 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");
Validate.isTrue(samplesPerPixel * bitsPerSample <= 32 || samplesPerPixel * bitsPerSample % 32 == 0,
"samplesPerPixel * bitsPerSample must be < 32 or a multiple of 32");
int pixelStride = bitsPerSample * samplesPerPixel / 32;
for (int x = 0; x < srcWidth * pixelStride; x += samplePeriod * pixelStride) {
// System.arraycopy should be intrinsic, but consider using direct array access for pixelStride == 1
System.arraycopy(srcRow, srcPos + x, destRow, destPos + x / samplePeriod, pixelStride);
}
}
public static void subsampleRow(double[] srcRow, int srcPos, int srcWidth,
double[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1"); // Period == 1 could be a no-op...
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 64 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 64 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");
Validate.isTrue(samplesPerPixel * bitsPerSample <= 64 || samplesPerPixel * bitsPerSample % 64 == 0,
"samplesPerPixel * bitsPerSample must be < 64 or a multiple of 64");
int pixelStride = bitsPerSample * samplesPerPixel / 64;
for (int x = 0; x < srcWidth * pixelStride; x += samplePeriod * pixelStride) {
// System.arraycopy should be intrinsic, but consider using direct array access for pixelStride == 1
System.arraycopy(srcRow, srcPos + x, destRow, destPos + x / samplePeriod, pixelStride);
}
}
}