com.google.zxing.client.android
Class PlanarYUVLuminanceSource
java.lang.Object
com.google.zxing.LuminanceSource
com.google.zxing.client.android.PlanarYUVLuminanceSource
public final class PlanarYUVLuminanceSource
- extends LuminanceSource
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.
- Author:
- dswitkin@google.com (Daniel Switkin)
Constructor Summary |
PlanarYUVLuminanceSource(byte[] yuvData,
int dataWidth,
int dataHeight,
int left,
int top,
int width,
int height,
boolean reverseHorizontal)
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
PlanarYUVLuminanceSource
public PlanarYUVLuminanceSource(byte[] yuvData,
int dataWidth,
int dataHeight,
int left,
int top,
int width,
int height,
boolean reverseHorizontal)
getRow
public byte[] getRow(int y,
byte[] row)
- Description copied from class:
LuminanceSource
- Fetches one row of luminance data from the underlying platform's bitmap. Values range from
0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have
to bitwise and with 0xff for each value. It is preferable for implementations of this method
to only fetch this row rather than the whole image, since no 2D Readers may be installed and
getMatrix() may never be called.
- Specified by:
getRow
in class LuminanceSource
- Parameters:
y
- The row to fetch, 0 <= y < getHeight().row
- An optional preallocated array. If null or too small, it will be ignored.
Always use the returned object, and ignore the .length of the array.
- Returns:
- An array containing the luminance data.
getMatrix
public byte[] getMatrix()
- Description copied from class:
LuminanceSource
- Fetches luminance data for the underlying bitmap. Values should be fetched using:
int luminance = array[y * width + x] & 0xff;
- Specified by:
getMatrix
in class LuminanceSource
- Returns:
- A row-major 2D array of luminance values. Do not use result.length as it may be
larger than width * height bytes on some platforms. Do not modify the contents
of the result.
isCropSupported
public boolean isCropSupported()
- Overrides:
isCropSupported
in class LuminanceSource
- Returns:
- Whether this subclass supports cropping.
renderCroppedGreyscaleBitmap
public android.graphics.Bitmap renderCroppedGreyscaleBitmap()