| /* |
| * 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.render; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.util.zip.Deflater; |
| import java.util.zip.DeflaterOutputStream; |
| |
| import org.apache.xmlgraphics.image.loader.ImageSize; |
| |
| public final class RawPNGTestUtil { |
| |
| private static final int NUM_ROWS = 32; |
| private static final int NUM_COLUMNS = 32; |
| private static final int DPI = 72; |
| |
| private RawPNGTestUtil() { |
| |
| } |
| |
| /** |
| * Builds a PNG IDAT section for a square of a given color and alpha; the filter is fixed. |
| * @param gray the gray color; set to -1 if using RGB |
| * @param red the red color; ignored if gray > -1 |
| * @param green the green color; ignored if gray > -1 |
| * @param blue the blue color; ignored if gray > -1 |
| * @param alpha the alpha color; set to -1 if not present |
| * @return the PNG IDAT byte array |
| * @throws IOException |
| */ |
| public static byte[] buildGRGBAData(int gray, int red, int green, int blue, int alpha) throws IOException { |
| // build an image, 32x32, Gray or RGB, with or without alpha, and with filter |
| int filter = 0; |
| int numRows = NUM_ROWS; |
| int numColumns = NUM_COLUMNS; |
| int numComponents = (gray > -1 ? 1 : 3) + (alpha > -1 ? 1 : 0); |
| int numBytesPerRow = numColumns * numComponents + 1; // 1 for filter |
| int numBytes = numRows * numBytesPerRow; |
| byte[] data = new byte[numBytes]; |
| for (int r = 0; r < numRows; r++) { |
| data[r * numBytesPerRow] = (byte) filter; |
| for (int c = 0; c < numColumns; c++) { |
| if (numComponents == 1) { |
| data[r * numBytesPerRow + numComponents * c + 1] = (byte) gray; |
| } else if (numComponents == 2) { |
| data[r * numBytesPerRow + numComponents * c + 1] = (byte) gray; |
| data[r * numBytesPerRow + numComponents * c + 2] = (byte) alpha; |
| } else if (numComponents == 3) { |
| data[r * numBytesPerRow + numComponents * c + 1] = (byte) red; |
| data[r * numBytesPerRow + numComponents * c + 2] = (byte) green; |
| data[r * numBytesPerRow + numComponents * c + 3] = (byte) blue; |
| } else if (numComponents == 4) { |
| data[r * numBytesPerRow + numComponents * c + 1] = (byte) red; |
| data[r * numBytesPerRow + numComponents * c + 2] = (byte) green; |
| data[r * numBytesPerRow + numComponents * c + 3] = (byte) blue; |
| data[r * numBytesPerRow + numComponents * c + 4] = (byte) alpha; |
| } |
| } |
| } |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| DeflaterOutputStream dos = new DeflaterOutputStream(baos, new Deflater()); |
| dos.write(data); |
| dos.close(); |
| return baos.toByteArray(); |
| } |
| |
| /** |
| * |
| * @return a default ImageSize |
| */ |
| public static ImageSize getImageSize() { |
| return new ImageSize(NUM_ROWS, NUM_COLUMNS, DPI); |
| } |
| } |