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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.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);
- }
- }
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