+/*
+ * 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. Any subsequent color data will be ignored.
+ *
+ * @author dswitkin@google.com (Daniel Switkin)
+ */
+public final class PlanarYUVLuminanceSource extends BaseLuminanceSource {
+ 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) {
+ 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;
+ }
+
+ @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;
+ }
+
+ @Override
+ public LuminanceSource crop(int left, int top, int width, int height) {
+ return new PlanarYUVLuminanceSource(yuvData, dataWidth, dataHeight, left, top, width, height);
+ }
+
+ @Override
+ public int getDataWidth() {
+ return dataWidth;
+ }
+
+ @Override
+ public int getDataHeight() {
+ return dataHeight;
+ }
+
+ @Override
+ 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;
+ }
+
+ // Can't be implemented here, as the color representations vary.
+ @Override
+ public Bitmap renderFullColorBitmap(boolean halfSize) {
+ return null;
+ }
+}
projects / zxing.git / commitdiff