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Added an optimization to the Android client's LuminanceSource implementation, and removed manual array copies in favor of System.arraycopy().

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git-svn-id: https://zxing.googlecode.com/svn/trunk@1020 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
dswitkin 2009-07-15 18:32:01 +00:00
parent c51c5800f6
commit 38f73bca64
1 changed files with 11 additions and 9 deletions
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20
android/src/com/google/zxing/client/android/YUVLuminanceSource.java
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@ -59,10 +59,7 @@ public final class YUVLuminanceSource extends LuminanceSource {
row = new byte[width]; row = new byte[width];
} }
int offset = (y + top) * dataWidth + left; int offset = (y + top) * dataWidth + left;
byte[] yuv = yuvData; System.arraycopy(yuvData, offset, row, 0, width);
for (int x = 0; x < width; x++) {
row[x] = yuv[offset + x];
}
return row; return row;
} }
@ -78,14 +75,19 @@ public final class YUVLuminanceSource extends LuminanceSource {
int area = width * height; int area = width * height;
byte[] matrix = new byte[area]; byte[] matrix = new byte[area];
byte[] yuv = yuvData;
int inputOffset = top * dataWidth + left; 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++) { for (int y = 0; y < height; y++) {
int outputOffset = y * width; int outputOffset = y * width;
for (int x = 0; x < width; x++) { System.arraycopy(yuv, inputOffset, matrix, outputOffset, width);
// TODO: Compare performance with using System.arraycopy().
matrix[outputOffset + x] = yuv[inputOffset + x];
}
inputOffset += dataWidth; inputOffset += dataWidth;
} }
return matrix; return matrix;