| /* |
| * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.imageio.plugins.png; |
| |
| import java.awt.image.ColorModel; |
| import java.awt.image.IndexColorModel; |
| import java.awt.image.SampleModel; |
| import java.util.Locale; |
| import javax.imageio.ImageWriter; |
| import javax.imageio.ImageTypeSpecifier; |
| import javax.imageio.metadata.IIOMetadataFormat; |
| import javax.imageio.metadata.IIOMetadataFormatImpl; |
| import javax.imageio.spi.ImageWriterSpi; |
| import javax.imageio.stream.ImageOutputStream; |
| |
| public class PNGImageWriterSpi extends ImageWriterSpi { |
| |
| private static final String vendorName = "Oracle Corporation"; |
| |
| private static final String version = "1.0"; |
| |
| private static final String[] names = { "png", "PNG" }; |
| |
| private static final String[] suffixes = { "png" }; |
| |
| private static final String[] MIMETypes = { "image/png", "image/x-png" }; |
| |
| private static final String writerClassName = |
| "com.sun.imageio.plugins.png.PNGImageWriter"; |
| |
| private static final String[] readerSpiNames = { |
| "com.sun.imageio.plugins.png.PNGImageReaderSpi" |
| }; |
| |
| public PNGImageWriterSpi() { |
| super(vendorName, |
| version, |
| names, |
| suffixes, |
| MIMETypes, |
| writerClassName, |
| new Class[] { ImageOutputStream.class }, |
| readerSpiNames, |
| false, |
| null, null, |
| null, null, |
| true, |
| PNGMetadata.nativeMetadataFormatName, |
| "com.sun.imageio.plugins.png.PNGMetadataFormat", |
| null, null |
| ); |
| } |
| |
| public boolean canEncodeImage(ImageTypeSpecifier type) { |
| SampleModel sampleModel = type.getSampleModel(); |
| ColorModel colorModel = type.getColorModel(); |
| |
| // Find the maximum bit depth across all channels |
| int[] sampleSize = sampleModel.getSampleSize(); |
| int bitDepth = sampleSize[0]; |
| for (int i = 1; i < sampleSize.length; i++) { |
| if (sampleSize[i] > bitDepth) { |
| bitDepth = sampleSize[i]; |
| } |
| } |
| |
| // Ensure bitDepth is between 1 and 16 |
| if (bitDepth < 1 || bitDepth > 16) { |
| return false; |
| } |
| |
| // Check number of bands, alpha |
| int numBands = sampleModel.getNumBands(); |
| if (numBands < 1 || numBands > 4) { |
| return false; |
| } |
| |
| boolean hasAlpha = colorModel.hasAlpha(); |
| // Fix 4464413: PNGTransparency reg-test was failing |
| // because for IndexColorModels that have alpha, |
| // numBands == 1 && hasAlpha == true, thus causing |
| // the check below to fail and return false. |
| if (colorModel instanceof IndexColorModel) { |
| return true; |
| } |
| if ((numBands == 1 || numBands == 3) && hasAlpha) { |
| return false; |
| } |
| if ((numBands == 2 || numBands == 4) && !hasAlpha) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| public String getDescription(Locale locale) { |
| return "Standard PNG image writer"; |
| } |
| |
| public ImageWriter createWriterInstance(Object extension) { |
| return new PNGImageWriter(this); |
| } |
| } |