2 * Copyright 2009 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.client.android;
19 import com.google.zxing.LuminanceSource;
21 import android.graphics.Bitmap;
24 * This object extends LuminanceSource around an array of YUV data returned from the camera driver,
25 * with the option to crop to a rectangle within the full data. This can be used to exclude
26 * superfluous pixels around the perimeter and speed up decoding.
28 * It handles YUV 422 interleaved data, where each pixel consists of first a Y value, then
29 * a color value, with U and V alternating at each pixel.
31 * @author dswitkin@google.com (Daniel Switkin)
33 public final class InterleavedYUV422LuminanceSource extends BaseLuminanceSource {
34 private final byte[] yuvData;
35 private final int dataWidth;
36 private final int dataHeight;
37 private final int left;
38 private final int top;
40 public InterleavedYUV422LuminanceSource(byte[] yuvData, int dataWidth, int dataHeight,
41 int left, int top, int width, int height) {
44 if (left + width > dataWidth || top + height > dataHeight) {
45 throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
48 this.yuvData = yuvData;
49 this.dataWidth = dataWidth;
50 this.dataHeight = dataHeight;
56 public byte[] getRow(int y, byte[] row) {
57 if (y < 0 || y >= getHeight()) {
58 throw new IllegalArgumentException("Requested row is outside the image: " + y);
60 int width = getWidth();
61 if (row == null || row.length < width) {
62 row = new byte[width];
64 int offset = (y + top) * dataWidth * 2 + (left * 2);
66 for (int x = 0; x < width; x++) {
67 row[x] = yuv[offset + (x << 1)];
73 public byte[] getMatrix() {
74 int width = getWidth();
75 int height = getHeight();
76 int area = width * height;
77 byte[] matrix = new byte[area];
78 int inputOffset = top * dataWidth * 2 + (left * 2);
81 for (int y = 0; y < height; y++) {
82 int outputOffset = y * width;
83 for (int x = 0; x < width; x++) {
84 matrix[outputOffset + x] = yuv[inputOffset + (x << 1)];
86 inputOffset += (dataWidth * 2);
92 public boolean isCropSupported() {
97 public LuminanceSource crop(int left, int top, int width, int height) {
98 return new InterleavedYUV422LuminanceSource(yuvData, dataWidth, dataHeight, left, top,
103 public int getDataWidth() {
108 public int getDataHeight() {
113 public Bitmap renderCroppedGreyscaleBitmap() {
114 int width = getWidth();
115 int height = getHeight();
116 int[] pixels = new int[width * height];
117 byte[] yuv = yuvData;
118 int inputOffset = top * dataWidth * 2 + (left * 2);
120 for (int y = 0; y < height; y++) {
121 int outputOffset = y * width;
122 for (int x = 0; x < width; x++) {
123 int grey = yuv[inputOffset + (x << 1)] & 0xff;
124 pixels[outputOffset + x] = (0xff000000) | (grey * 0x00010101);
126 inputOffset += (dataWidth * 2);
129 Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
130 bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
135 public Bitmap renderFullColorBitmap(boolean halfSize) {