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- /*
- * 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.image;
-
- import java.io.IOException;
-
- import org.apache.xmlgraphics.image.codec.png.PNGRed;
- import org.apache.xmlgraphics.image.codec.png.PNGDecodeParam;
- import org.apache.xmlgraphics.image.codec.util.SeekableStream;
- import org.apache.xmlgraphics.image.rendered.CachableRed;
- import org.apache.commons.io.IOUtils;
-
- /**
- * FopImage object using PNG
- *
- * @see AbstractFopImage
- * @see FopImage
- */
- public class PNGImage extends XmlGraphicsCommonsImage {
-
- /**
- * Constructs a new PNGImage instance.
- * @param imgReader basic metadata for the image
- */
- public PNGImage(FopImage.ImageInfo imgReader) {
- super(imgReader);
- this.loaded = 0; //TODO The PNGReader cannot read the resolution, yet.
- }
-
- /**
- * {@inheritDoc}
- */
- protected CachableRed decodeImage(SeekableStream stream) throws IOException {
- PNGDecodeParam param = new PNGDecodeParam();
- param.setPerformGammaCorrection(true);
- param.setDisplayExponent(2.2f); // sRGB gamma
- PNGRed red = new PNGRed(stream, param);
- String unit = (String)red.getProperty("pixel_units");
- if ("Meters".equals(unit)) {
- this.dpiHorizontal = ((Integer)red.getProperty("x_pixels_per_unit")).intValue()
- * 25.4f / 1000f;
- this.dpiVertical = ((Integer)red.getProperty("y_pixels_per_unit")).intValue()
- * 25.4f / 1000f;
- }
- return red;
- }
-
- /**
- * Load the original PNG data.
- * This loads the original PNG data as is into memory.
- *
- * @return true if loaded false for any error
- */
- protected boolean loadOriginalData() {
- try {
- seekableInput.seek(0);
- this.raw = IOUtils.toByteArray(seekableInput);
-
- } catch (java.io.IOException ex) {
- log.error("Error while loading raw image: " + ex.getMessage(), ex);
- return false;
- } finally {
- IOUtils.closeQuietly(inputStream);
- inputStream = null;
- }
-
- return true;
- }
-
- }
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