-/*
- * 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.
- *
- * @author dswitkin@google.com (Daniel Switkin)
- */
-public final class YUVLuminanceSource extends LuminanceSource {
-
- private final byte[] yuvData;
- private final int dataWidth;
- private final int dataHeight;
- private final int left;
- private final int top;
-
- public YUVLuminanceSource(byte[] yuvData, int dataWidth, int dataHeight, int left, int top,
- int width, int height) {
- 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;
- }
-
- 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;
- }
-
- 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;
- }
-
- public boolean isCropSupported() {
- return true;
- }
-
- public LuminanceSource crop(int left, int top, int width, int height) {
- return new YUVLuminanceSource(yuvData, dataWidth, dataHeight, left, top, width, height);
- }
-
- /**
- * Creates a greyscale Android Bitmap from the YUV data based on the crop rectangle.
- *
- * @return An 8888 bitmap.
- */
- public Bitmap renderToBitmap() {
- 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] = (0xff << 24) | (grey << 16) | (grey << 8) | grey;
- }
- inputOffset += dataWidth;
- }
-
- Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
- bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
- return bitmap;
- }
-
-}