OCR Configurable  1.0
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PlanarYUVLuminanceSource.java
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00001 /*
00002  * Copyright 2009 ZXing authors
00003  * Copyright 2011 Robert Theis
00004  * Copyright 2012 Jaime Navarro Santapau
00005  *
00006  * Licensed under the Apache License, Version 2.0 (the "License");
00007  * you may not use this file except in compliance with the License.
00008  * You may obtain a copy of the License at
00009  *
00010  *      http://www.apache.org/licenses/LICENSE-2.0
00011  *
00012  * Unless required by applicable law or agreed to in writing, software
00013  * distributed under the License is distributed on an "AS IS" BASIS,
00014  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00015  * See the License for the specific language governing permissions and
00016  * limitations under the License.
00017  */
00018 
00026 package edu.uoc.ocr;
00027 
00028 import android.graphics.Bitmap;
00029 
00037 public final class PlanarYUVLuminanceSource extends LuminanceSource {
00038 
00039         private final byte[] yuvData;
00040         private final int dataWidth;
00041         private final int dataHeight;
00042         private final int left;
00043         private final int top;
00044 
00045         public PlanarYUVLuminanceSource(byte[] yuvData, int dataWidth,
00046                         int dataHeight, int left, int top, int width, int height,
00047                         boolean reverseHorizontal) {
00048                 super(width, height);
00049 
00050                 if (left + width > dataWidth || top + height > dataHeight) {
00051                         throw new IllegalArgumentException(
00052                                         "Crop rectangle does not fit within image data.");
00053                 }
00054 
00055                 this.yuvData = yuvData;
00056                 this.dataWidth = dataWidth;
00057                 this.dataHeight = dataHeight;
00058                 this.left = left;
00059                 this.top = top;
00060                 if (reverseHorizontal) {
00061                         reverseHorizontal(width, height);
00062                 }
00063         }
00064 
00065         @Override
00066         public byte[] getRow(int y, byte[] row) {
00067                 if (y < 0 || y >= getHeight()) {
00068                         throw new IllegalArgumentException(
00069                                         "Requested row is outside the image: " + y);
00070                 }
00071                 int width = getWidth();
00072                 if (row == null || row.length < width) {
00073                         row = new byte[width];
00074                 }
00075                 int offset = (y + top) * dataWidth + left;
00076                 System.arraycopy(yuvData, offset, row, 0, width);
00077                 return row;
00078         }
00079 
00080         @Override
00081         public byte[] getMatrix() {
00082                 int width = getWidth();
00083                 int height = getHeight();
00084 
00085                 // If the caller asks for the entire underlying image, save the copy and
00086                 // give them the
00087                 // original data. The docs specifically warn that result.length must be
00088                 // ignored.
00089                 if (width == dataWidth && height == dataHeight) {
00090                         return yuvData;
00091                 }
00092 
00093                 int area = width * height;
00094                 byte[] matrix = new byte[area];
00095                 int inputOffset = top * dataWidth + left;
00096 
00097                 // If the width matches the full width of the underlying data, perform a
00098                 // single copy.
00099                 if (width == dataWidth) {
00100                         System.arraycopy(yuvData, inputOffset, matrix, 0, area);
00101                         return matrix;
00102                 }
00103 
00104                 // Otherwise copy one cropped row at a time.
00105                 byte[] yuv = yuvData;
00106                 for (int y = 0; y < height; y++) {
00107                         int outputOffset = y * width;
00108                         System.arraycopy(yuv, inputOffset, matrix, outputOffset, width);
00109                         inputOffset += dataWidth;
00110                 }
00111                 return matrix;
00112         }
00113 
00114         @Override
00115         public boolean isCropSupported() {
00116                 return true;
00117         }
00118 
00119         @Override
00120         public LuminanceSource crop(int left, int top, int width, int height) {
00121                 return new PlanarYUVLuminanceSource(yuvData, dataWidth, dataHeight,
00122                                 this.left + left, this.top + top, width, height, false);
00123         }
00124 
00125         public Bitmap renderCroppedGreyscaleBitmap() {
00126                 int width = getWidth();
00127                 int height = getHeight();
00128                 int[] pixels = new int[width * height];
00129                 byte[] yuv = yuvData;
00130                 int inputOffset = top * dataWidth + left;
00131 
00132                 for (int y = 0; y < height; y++) {
00133                         int outputOffset = y * width;
00134                         for (int x = 0; x < width; x++) {
00135                                 int grey = yuv[inputOffset + x] & 0xff;
00136                                 pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);
00137                         }
00138                         inputOffset += dataWidth;
00139                 }
00140 
00141                 Bitmap bitmap = Bitmap.createBitmap(width, height,
00142                                 Bitmap.Config.ARGB_8888);
00143                 bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
00144                 return bitmap;
00145         }
00146 
00147         private void reverseHorizontal(int width, int height) {
00148                 byte[] yuvData = this.yuvData;
00149                 for (int y = 0, rowStart = top * dataWidth + left; y < height; y++, rowStart += dataWidth) {
00150                         int middle = rowStart + width / 2;
00151                         for (int x1 = rowStart, x2 = rowStart + width - 1; x1 < middle; x1++, x2--) {
00152                                 byte temp = yuvData[x1];
00153                                 yuvData[x1] = yuvData[x2];
00154                                 yuvData[x2] = temp;
00155                         }
00156                 }
00157         }
00158 
00159 }
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