org.ros.android.view.visualization.TextureBitmapUtilities.java Source code

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Here is the source code for org.ros.android.view.visualization.TextureBitmapUtilities.java

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/*
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed 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.
 */

package org.ros.android.view.visualization;

import com.google.common.base.Preconditions;

import android.graphics.Bitmap;

/**
 * @author moesenle@google.com (Lorenz Moesenlechner)
 * @author damonkohler@google.com (Damon Kohler)
 */
public class TextureBitmapUtilities {

    public static Bitmap createSquareBitmap(int[] pixels, int width, int height, int fillColor) {
        Preconditions.checkArgument(pixels.length == width * height, String.format(
                "Pixel data does not match specified dimensions: %d != %d * %d", pixels.length, width, height));
        int bitmapSize = Math.max(width, height);
        int[] squarePixelArray = makeSquarePixelArray(pixels, width, height, bitmapSize, fillColor);
        return Bitmap.createBitmap(squarePixelArray, bitmapSize, bitmapSize, Bitmap.Config.ARGB_8888);
    }

    /**
     * Takes a pixel array representing an image of size width and height and
     * returns a square image with side length goalSize.
     * 
     * @param pixels
     *          input pixels to format
     * @param width
     *          width of the input array
     * @param height
     *          height of the input array
     * @param outputSize
     *          side length of the output image
     * @param fillColor
     *          color to use for filling additional pixels
     * @return the new pixel array with size goalSize * goalSize
     */
    private static int[] makeSquarePixelArray(int[] pixels, int width, int height, int outputSize, int fillColor) {
        int[] result = new int[outputSize * outputSize];
        int maxWidth = width > outputSize ? width : outputSize;
        for (int h = 0, i = 0; h < outputSize; h++) {
            for (int w = 0; w < maxWidth; w++, i++) {
                if (h < height && w < width) {
                    result[i] = pixels[h * width + w];
                } else {
                    result[i] = fillColor;
                }
            }
        }
        return result;
    }
}