/*
- * Copyright 2007 Google Inc.
+ * Copyright 2007 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
/**
* <p>An implementation based on Java ME's {@link Image} representation.</p>
*
- * @author Sean Owen (srowen@google.com), Daniel Switkin (dswitkin@google.com)
+ * @author Sean Owen
+ * @author Daniel Switkin (dswitkin@google.com)
*/
public final class LCDUIImageMonochromeBitmapSource extends BaseMonochromeBitmapSource {
private final Image image;
- private final int height;
- private final int width;
- private final int[] rgbRow;
private final int[] pixelHolder;
- private int cachedRow;
public LCDUIImageMonochromeBitmapSource(Image image) {
+ super(image.getWidth(), image.getHeight());
this.image = image;
- height = image.getHeight();
- width = image.getWidth();
- rgbRow = new int[width];
pixelHolder = new int[1];
- cachedRow = -1;
}
- public int getHeight() {
- return height;
- }
-
- public int getWidth() {
- return width;
- }
-
- public int getLuminance(int x, int y) {
- int pixel;
- if (cachedRow == y) {
- pixel = rgbRow[x];
- } else {
- image.getRGB(pixelHolder, 0, width, x, y, 1, 1);
- pixel = pixelHolder[0];
- }
+ // This is expensive and should be used very sparingly.
+ protected int getLuminance(int x, int y) {
+ image.getRGB(pixelHolder, 0, getWidth(), x, y, 1, 1);
+ int pixel = pixelHolder[0];
// Instead of multiplying by 306, 601, 117, we multiply by 256, 512, 256, so that
// the multiplies can be implemented as shifts.
(pixel & 0x000000FF )) >> 2;
}
- public void cacheRowForLuminance(int y) {
- if (y != cachedRow) {
- image.getRGB(rgbRow, 0, width, 0, y, width, 1);
- cachedRow = y;
+ // For efficiency, the RGB data and the luminance data share the same array.
+ protected int[] getLuminanceRow(int y, int[] row) {
+ int width = getWidth();
+ if (row == null || row.length < width) {
+ row = new int[width];
+ }
+ image.getRGB(row, 0, width, 0, y, width, 1);
+ for (int x = 0; x < width; x++) {
+ int pixel = row[x];
+ row[x] = (((pixel & 0x00FF0000) >> 16) +
+ ((pixel & 0x0000FF00) >> 7) +
+ (pixel & 0x000000FF )) >> 2;
+ }
+ return row;
+ }
+
+ protected int[] getLuminanceColumn(int x, int[] column) {
+ int height = getHeight();
+ if (column == null || column.length < height) {
+ column = new int[height];
+ }
+ image.getRGB(column, 0, 1, x, 0, 1, height);
+ for (int y = 0; y < height; y++) {
+ int pixel = column[y];
+ column[y] = (((pixel & 0x00FF0000) >> 16) +
+ ((pixel & 0x0000FF00) >> 7) +
+ (pixel & 0x000000FF )) >> 2;
}
+ return column;
}
-}
\ No newline at end of file
+}