Sets pixels in the given bitmap to a grayscale image from the byte array from a camera preview, assumed to be in YUV (NV21) format with brightness pixels first. - Android Graphics

Android examples for Graphics:Bitmap Color

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Description

Sets pixels in the given bitmap to a grayscale image from the byte array from a camera preview, assumed to be in YUV (NV21) format with brightness pixels first.

Demo Code

/* // ww  w . ja  v a  2 s.co m
 * Copyright 2012 Google Inc. All Rights Reserved.
 *
 * 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 com.java2s;

import android.graphics.Bitmap;

public class Main {
    /** Sets pixels in the given bitmap to a grayscale image from the byte array from a camera preview,
     * assumed to be in YUV (NV21) format with brightness pixels first.
     */
    public static Bitmap fillGrayscaleBitmapFromData(Bitmap bitmap,
            byte[] cdata, int width, int height, int[] pixelBuffer) {
        int npixels = width * height;
        for (int i = 0; i < npixels; i++) {
            int g = 0xff & cdata[i];
            pixelBuffer[i] = (255 << 24) + (g << 16) + (g << 8) + g;
        }
        bitmap.setPixels(pixelBuffer, 0, width, 0, 0, width, height);
        return bitmap;
    }
}

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