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Make public to enable reuse; add convenience constructor for no cropping, or cropping without a Rect object. Also optimize a few things.

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git-svn-id: https://zxing.googlecode.com/svn/trunk@843 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2009-02-06 14:06:05 +00:00
parent 089cc3ac44
commit 5546f77004
1 changed files with 65 additions and 19 deletions
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84
android/src/com/google/zxing/client/android/YUVMonochromeBitmapSource.java
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@ -24,38 +24,81 @@ import com.google.zxing.common.BaseMonochromeBitmapSource;
* This object implements MonochromeBitmapSource around an array of YUV data, giving you 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 Sean Owen
* @author Daniel Switkin
*/
final class YUVMonochromeBitmapSource extends BaseMonochromeBitmapSource {
public final class YUVMonochromeBitmapSource extends BaseMonochromeBitmapSource {
private final byte[] mYUVData;
private final int mDataWidth;
private final Rect mCrop;
private final int mCropTop;
private final int mCropLeft;
private final int mCropBottom;
private final int mCropRight;
/**
* Builds an object around a YUV buffer from the camera.
* Builds an object around a YUV buffer from the camera. The image is not cropped.
*
* @param yuvData A byte array of planar Y data, followed by interleaved U and V
* @param dataWidth The width of the Y data
* @param dataHeight The height of the Y data
*/
public YUVMonochromeBitmapSource(byte[] yuvData, int dataWidth, int dataHeight) {
this(yuvData, dataWidth, dataHeight, 0, 0, dataHeight, dataWidth);
}
/**
* Builds an object around a YUV buffer from the camera. THe image is cropped and only
* that part of the image is evaluated.
*
* @param yuvData A byte array of planar Y data, followed by interleaved U and V
* @param dataWidth The width of the Y data
* @param dataHeight The height of the Y data
* @param crop The rectangle within the yuvData to expose to MonochromeBitmapSource users
*/
YUVMonochromeBitmapSource(byte[] yuvData, int dataWidth, int dataHeight, Rect crop) {
if (crop.width() > dataWidth || crop.height() > dataHeight) {
public YUVMonochromeBitmapSource(byte[] yuvData, int dataWidth, int dataHeight, Rect crop) {
this(yuvData, dataWidth, dataHeight, crop.top, crop.left, crop.bottom, crop.right);
}
/**
* Builds an object around a YUV buffer from the camera. The image is cropped and only
* that part of the image is evaluated.
*
* @param yuvData A byte array of planar Y data, followed by interleaved U and V
* @param dataWidth The width of the Y data
* @param dataHeight The height of the Y data
* @param cropTop Top coordinate of rectangle to crop
* @param cropLeft Left coordinate of rectangle to crop
* @param cropBottom Bottom coordinate of rectangle to crop
* @param cropRight Right coordinate of rectangle to crop
*/
public YUVMonochromeBitmapSource(byte[] yuvData,
int dataWidth,
int dataHeight,
int cropTop,
int cropLeft,
int cropBottom,
int cropRight) {
if (cropRight - cropLeft > dataWidth || cropBottom - cropTop > dataHeight) {
throw new IllegalArgumentException();
}
mYUVData = yuvData;
mDataWidth = dataWidth;
mCrop = crop;
this.mCropTop = cropTop;
this.mCropLeft = cropLeft;
this.mCropBottom = cropBottom;
this.mCropRight = cropRight;
}
@Override
public int getHeight() {
return mCrop.height();
return mCropBottom - mCropTop;
}
@Override
public int getWidth() {
return mCrop.width();
return mCropRight - mCropLeft;
}
/**
@ -68,7 +111,7 @@ final class YUVMonochromeBitmapSource extends BaseMonochromeBitmapSource {
*/
@Override
protected int getLuminance(int x, int y) {
return mYUVData[(y + mCrop.top) * mDataWidth + x + mCrop.left] & 0xff;
return mYUVData[(y + mCropTop) * mDataWidth + x + mCropLeft] & 0xff;
}
@Override
@ -77,9 +120,10 @@ final class YUVMonochromeBitmapSource extends BaseMonochromeBitmapSource {
if (row == null || row.length < width) {
row = new int[width];
}
int offset = (y + mCrop.top) * mDataWidth + mCrop.left;
int offset = (y + mCropTop) * mDataWidth + mCropLeft;
byte[] yuvData = mYUVData;
for (int x = 0; x < width; x++) {
row[x] = mYUVData[offset + x] & 0xff;
row[x] = yuvData[offset + x] & 0xff;
}
return row;
}
@ -90,10 +134,12 @@ final class YUVMonochromeBitmapSource extends BaseMonochromeBitmapSource {
if (column == null || column.length < height) {
column = new int[height];
}
int offset = mCrop.top * mDataWidth + mCrop.left + x;
int dataWidth = mDataWidth;
int offset = mCropTop * dataWidth + mCropLeft + x;
byte[] yuvData = mYUVData;
for (int y = 0; y < height; y++) {
column[y] = mYUVData[offset] & 0xff;
offset += mDataWidth;
column[y] = yuvData[offset] & 0xff;
offset += dataWidth;
}
return column;
}
@ -104,13 +150,13 @@ final class YUVMonochromeBitmapSource extends BaseMonochromeBitmapSource {
* @return An 8888 bitmap.
*/
public Bitmap renderToBitmap() {
int width = mCrop.width();
int height = mCrop.height();
int width = getWidth();
int height = getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
int base = (y + mCrop.top) * mDataWidth + mCrop.left;
byte[] yuvData = mYUVData;
for (int y = 0, base = mCropTop * mDataWidth + mCropLeft; y < height; y++, base += mDataWidth) {
for (int x = 0; x < width; x++) {
int grey = mYUVData[base + x] & 0xff;
int grey = yuvData[base + x] & 0xff;
pixels[y * width + x] = (0xff << 24) | (grey << 16) | (grey << 8) | grey;
}
}