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Oops, off-by-one bug fix, and some more comments

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git-svn-id: https://zxing.googlecode.com/svn/trunk@350 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2008-04-07 20:32:17 +00:00
parent 5659a711a2
commit 19dbe047fd
1 changed files with 16 additions and 1 deletions
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17
javase/src/com/google/zxing/client/j2se/BufferedImageMonochromeBitmapSource.java
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@ -53,10 +53,25 @@ public final class BufferedImageMonochromeBitmapSource implements MonochromeBitm
private static final int LUMINANCE_SHIFT = 8 - LUMINANCE_BITS;
private static final int LUMINANCE_BUCKETS = 1 << LUMINANCE_BITS;
/**
* Creates an instance that uses the entire given image as a source of pixels to decode.
*
* @param image image to decode
*/
public BufferedImageMonochromeBitmapSource(BufferedImage image) {
this(image, 0, 0, image.getWidth(), image.getHeight());
}
/**
* Creates an instance that uses only a region of the given image as a source of pixels to decode.
*
* @param image image to decode a region of
* @param left x coordinate of leftmost pixels to decode
* @param top y coordinate of topmost pixels to decode
* @param right one more than the x coordinate of rightmost pixels to decode. That is, we will decode
* pixels whose x coordinate is in [left,right)
* @param bottom likewise, one more than the y coordinate of the bottommost pixels to decode
*/
public BufferedImageMonochromeBitmapSource(BufferedImage image, int left, int top, int right, int bottom) {
this.image = image;
blackPoint = 0x7F;
@ -64,7 +79,7 @@ public final class BufferedImageMonochromeBitmapSource implements MonochromeBitm
lastArgument = 0;
int sourceHeight = image.getHeight();
int sourceWidth = image.getWidth();
if (left < 0 || top < 0 || right >= sourceWidth || bottom >= sourceHeight || right <= left || bottom <= top) {
if (left < 0 || top < 0 || right > sourceWidth || bottom > sourceHeight || right <= left || bottom <= top) {
throw new IllegalArgumentException("Invalid bounds: (" + top + ',' + left + ") (" + right + ',' + bottom + ')');
}
this.left = left;