| /* |
| * Copyright 2009 ZXing authors |
| * |
| * 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.google.zxing.client.android; |
| |
| import com.google.zxing.LuminanceSource; |
| |
| import android.graphics.Bitmap; |
| |
| /** |
| * This object extends LuminanceSource around an array of YUV data returned from the camera driver, |
| * with the option to crop to a rectangle within the full data. This can be used to exclude |
| * superfluous pixels around the perimeter and speed up decoding. |
| * |
| * It works for any pixel format where the Y channel is planar and appears first, including |
| * YCbCr_420_SP and YCbCr_422_SP. |
| * |
| * @author dswitkin@google.com (Daniel Switkin) |
| */ |
| public final class PlanarYUVLuminanceSource extends LuminanceSource { |
| |
| private final byte[] yuvData; |
| private final int dataWidth; |
| private final int dataHeight; |
| private final int left; |
| private final int top; |
| |
| public PlanarYUVLuminanceSource(byte[] yuvData, int dataWidth, int dataHeight, int left, int top, |
| int width, int height, boolean reverseHorizontal) { |
| super(width, height); |
| |
| if (left + width > dataWidth || top + height > dataHeight) { |
| throw new IllegalArgumentException("Crop rectangle does not fit within image data."); |
| } |
| |
| this.yuvData = yuvData; |
| this.dataWidth = dataWidth; |
| this.dataHeight = dataHeight; |
| this.left = left; |
| this.top = top; |
| if (reverseHorizontal) { |
| reverseHorizontal(width, height); |
| } |
| } |
| |
| @Override |
| public byte[] getRow(int y, byte[] row) { |
| if (y < 0 || y >= getHeight()) { |
| throw new IllegalArgumentException("Requested row is outside the image: " + y); |
| } |
| int width = getWidth(); |
| if (row == null || row.length < width) { |
| row = new byte[width]; |
| } |
| int offset = (y + top) * dataWidth + left; |
| System.arraycopy(yuvData, offset, row, 0, width); |
| return row; |
| } |
| |
| @Override |
| public byte[] getMatrix() { |
| int width = getWidth(); |
| int height = getHeight(); |
| |
| // If the caller asks for the entire underlying image, save the copy and give them the |
| // original data. The docs specifically warn that result.length must be ignored. |
| if (width == dataWidth && height == dataHeight) { |
| return yuvData; |
| } |
| |
| int area = width * height; |
| byte[] matrix = new byte[area]; |
| int inputOffset = top * dataWidth + left; |
| |
| // If the width matches the full width of the underlying data, perform a single copy. |
| if (width == dataWidth) { |
| System.arraycopy(yuvData, inputOffset, matrix, 0, area); |
| return matrix; |
| } |
| |
| // Otherwise copy one cropped row at a time. |
| byte[] yuv = yuvData; |
| for (int y = 0; y < height; y++) { |
| int outputOffset = y * width; |
| System.arraycopy(yuv, inputOffset, matrix, outputOffset, width); |
| inputOffset += dataWidth; |
| } |
| return matrix; |
| } |
| |
| @Override |
| public boolean isCropSupported() { |
| return true; |
| } |
| |
| public Bitmap renderCroppedGreyscaleBitmap() { |
| int width = getWidth(); |
| int height = getHeight(); |
| int[] pixels = new int[width * height]; |
| byte[] yuv = yuvData; |
| int inputOffset = top * dataWidth + left; |
| |
| for (int y = 0; y < height; y++) { |
| int outputOffset = y * width; |
| for (int x = 0; x < width; x++) { |
| int grey = yuv[inputOffset + x] & 0xff; |
| pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101); |
| } |
| inputOffset += dataWidth; |
| } |
| |
| Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
| bitmap.setPixels(pixels, 0, width, 0, 0, width, height); |
| return bitmap; |
| } |
| |
| private void reverseHorizontal(int width, int height) { |
| byte[] yuvData = this.yuvData; |
| for (int y = 0, rowStart = top * dataWidth + left; y < height; y++, rowStart += dataWidth) { |
| int middle = rowStart + width / 2; |
| for (int x1 = rowStart, x2 = rowStart + width - 1; x1 < middle; x1++, x2--) { |
| byte temp = yuvData[x1]; |
| yuvData[x1] = yuvData[x2]; |
| yuvData[x2] = temp; |
| } |
| } |
| } |
| |
| } |