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https://github.com/zxing/zxing.git
synced 2025-03-05 20:48:51 -08:00
Fixed a bug I introduced while removing exceptions, which caused the
x coordinate of 1D barcodes to always be flipped, as if they had been read upside down. git-svn-id: https://zxing.googlecode.com/svn/trunk@1547 59b500cc-1b3d-0410-9834-0bbf25fbcc57
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@ -24,181 +24,183 @@
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#include <limits.h>
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namespace zxing {
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namespace oned {
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using namespace std;
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namespace oned {
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using namespace std;
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OneDReader::OneDReader() {
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}
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OneDReader::OneDReader() {
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}
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Ref<Result> OneDReader::decode(Ref<BinaryBitmap> image, DecodeHints hints) {
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Ref<Result> result = doDecode(image, hints);
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if (result.empty() && hints.getTryHarder() && image->isRotateSupported()) {
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Ref<BinaryBitmap> rotatedImage(image->rotateCounterClockwise());
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result = doDecode(rotatedImage, hints);
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if (!result.empty()) {
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/*
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// Record that we found it rotated 90 degrees CCW / 270 degrees CW
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Hashtable metadata = result.getResultMetadata();
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int orientation = 270;
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if (metadata != null && metadata.containsKey(ResultMetadataType.ORIENTATION)) {
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// But if we found it reversed in doDecode(), add in that result here:
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orientation = (orientation +
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((Integer) metadata.get(ResultMetadataType.ORIENTATION)).intValue()) % 360;
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}
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result.putMetadata(ResultMetadataType.ORIENTATION, new Integer(orientation));
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*/
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Ref<Result> OneDReader::decode(Ref<BinaryBitmap> image, DecodeHints hints) {
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Ref<Result> result = doDecode(image, hints);
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if (result.empty() && hints.getTryHarder() && image->isRotateSupported()) {
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Ref<BinaryBitmap> rotatedImage(image->rotateCounterClockwise());
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result = doDecode(rotatedImage, hints);
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if (!result.empty()) {
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/*
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// Record that we found it rotated 90 degrees CCW / 270 degrees CW
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Hashtable metadata = result.getResultMetadata();
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int orientation = 270;
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if (metadata != null && metadata.containsKey(ResultMetadataType.ORIENTATION)) {
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// But if we found it reversed in doDecode(), add in that result here:
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orientation = (orientation +
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((Integer) metadata.get(ResultMetadataType.ORIENTATION)).intValue()) % 360;
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}
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result.putMetadata(ResultMetadataType.ORIENTATION, new Integer(orientation));
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*/
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// Update result points
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std::vector<Ref<ResultPoint> > points (result->getResultPoints());
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int height = rotatedImage->getHeight();
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for (size_t i = 0; i < points.size(); i++) {
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points[i].reset(new OneDResultPoint(height - points[i]->getY() - 1, points[i]->getX()));
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}
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}
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}
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if (result.empty()) {
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throw ReaderException("");
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}
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return result;
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}
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std::vector<Ref<ResultPoint> > points (result->getResultPoints());
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int height = rotatedImage->getHeight();
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for (size_t i = 0; i < points.size(); i++) {
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points[i].reset(new OneDResultPoint(height - points[i]->getY() - 1, points[i]->getX()));
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}
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}
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}
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if (result.empty()) {
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throw ReaderException("");
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}
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return result;
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}
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Ref<Result> OneDReader::doDecode(Ref<BinaryBitmap> image, DecodeHints hints) {
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int width = image->getWidth();
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int height = image->getHeight();
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Ref<BitArray> row(new BitArray(width));
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int middle = height >> 1;
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bool tryHarder = hints.getTryHarder();
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int rowStep = (int)fmax(1, height >> (tryHarder ? 8 : 5));
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int maxLines;
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if (tryHarder) {
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maxLines = height; // Look at the whole image, not just the center
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} else {
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Ref<Result> OneDReader::doDecode(Ref<BinaryBitmap> image, DecodeHints hints) {
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int width = image->getWidth();
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int height = image->getHeight();
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Ref<BitArray> row(new BitArray(width));
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int middle = height >> 1;
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bool tryHarder = hints.getTryHarder();
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int rowStep = (int)fmax(1, height >> (tryHarder ? 8 : 5));
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int maxLines;
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if (tryHarder) {
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maxLines = height; // Look at the whole image, not just the center
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} else {
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maxLines = 15; // 15 rows spaced 1/32 apart is roughly the middle half of the image
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}
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}
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for (int x = 0; x < maxLines; x++) {
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// Scanning from the middle out. Determine which row we're looking at next:
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int rowStepsAboveOrBelow = (x + 1) >> 1;
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bool isAbove = (x & 0x01) == 0; // i.e. is x even?
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int rowNumber = middle + rowStep * (isAbove ? rowStepsAboveOrBelow : -rowStepsAboveOrBelow);
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if (rowNumber < 0 || rowNumber >= height) {
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// Oops, if we run off the top or bottom, stop
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break;
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}
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for (int x = 0; x < maxLines; x++) {
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// Scanning from the middle out. Determine which row we're looking at next:
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int rowStepsAboveOrBelow = (x + 1) >> 1;
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bool isAbove = (x & 0x01) == 0; // i.e. is x even?
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int rowNumber = middle + rowStep * (isAbove ? rowStepsAboveOrBelow : -rowStepsAboveOrBelow);
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if (rowNumber < 0 || rowNumber >= height) {
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// Oops, if we run off the top or bottom, stop
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break;
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}
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// Estimate black point for this row and load it:
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try {
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row = image->getBlackRow(rowNumber, row);
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} catch (ReaderException re) {
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continue;
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} catch (IllegalArgumentException re) {
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// Estimate black point for this row and load it:
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try {
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row = image->getBlackRow(rowNumber, row);
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} catch (ReaderException re) {
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continue;
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}
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} catch (IllegalArgumentException re) {
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continue;
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}
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// While we have the image data in a BitArray, it's fairly cheap to reverse it in place to
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// handle decoding upside down barcodes.
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for (int attempt = 0; attempt < 2; attempt++) {
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if (attempt == 1) { // trying again?
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row->reverse(); // reverse the row and continue
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}
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// While we have the image data in a BitArray, it's fairly cheap to reverse it in place to
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// handle decoding upside down barcodes.
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for (int attempt = 0; attempt < 2; attempt++) {
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if (attempt == 1) {
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row->reverse(); // reverse the row and continue
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}
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// Look for a barcode
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Ref<Result> result = decodeRow(rowNumber, row);
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// We found our barcode
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if (!result.empty()) {
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// // But it was upside down, so note that
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// result.putMetadata(ResultMetadataType.ORIENTATION, new Integer(180));
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// // And remember to flip the result points horizontally.
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std::vector<Ref<ResultPoint> > points(result->getResultPoints());
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// if there's exactly two points (which there should be), flip the x coordinate
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// if there's not exactly 2, I don't know what do do with it
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if (points.size() == 2) {
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Ref<ResultPoint> pointZero(new OneDResultPoint(width - points[0]->getX() - 1,
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points[0]->getY()));
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points[0] = pointZero;
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if (attempt == 1) {
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// But it was upside down, so note that
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// result.putMetadata(ResultMetadataType.ORIENTATION, new Integer(180));
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// And remember to flip the result points horizontally.
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std::vector<Ref<ResultPoint> > points(result->getResultPoints());
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// if there's exactly two points (which there should be), flip the x coordinate
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// if there's not exactly 2, I don't know what do do with it
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if (points.size() == 2) {
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Ref<ResultPoint> pointZero(new OneDResultPoint(width - points[0]->getX() - 1,
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points[0]->getY()));
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points[0] = pointZero;
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Ref<ResultPoint> pointOne(new OneDResultPoint(width - points[1]->getX() - 1,
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points[1]->getY()));
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points[1] = pointOne;
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Ref<ResultPoint> pointOne(new OneDResultPoint(width - points[1]->getX() - 1,
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points[1]->getY()));
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points[1] = pointOne;
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result.reset(new Result(result->getText(), result->getRawBytes(), points,
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result->getBarcodeFormat()));
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result.reset(new Result(result->getText(), result->getRawBytes(), points,
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result->getBarcodeFormat()));
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}
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}
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return result;
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}
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}
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}
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return Ref<Result>();
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}
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}
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}
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return Ref<Result>();
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}
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unsigned int OneDReader::patternMatchVariance(int counters[], int countersSize,
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const int pattern[], int maxIndividualVariance) {
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int numCounters = countersSize;
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unsigned int total = 0;
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unsigned int patternLength = 0;
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for (int i = 0; i < numCounters; i++) {
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total += counters[i];
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patternLength += pattern[i];
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}
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if (total < patternLength) {
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// If we don't even have one pixel per unit of bar width, assume this is too small
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// to reliably match, so fail:
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return INT_MAX;
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}
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// We're going to fake floating-point math in integers. We just need to use more bits.
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// Scale up patternLength so that intermediate values below like scaledCounter will have
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// more "significant digits"
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unsigned int unitBarWidth = (total << INTEGER_MATH_SHIFT) / patternLength;
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maxIndividualVariance = (maxIndividualVariance * unitBarWidth) >> INTEGER_MATH_SHIFT;
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unsigned int OneDReader::patternMatchVariance(int counters[], int countersSize,
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const int pattern[], int maxIndividualVariance) {
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int numCounters = countersSize;
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unsigned int total = 0;
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unsigned int patternLength = 0;
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for (int i = 0; i < numCounters; i++) {
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total += counters[i];
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patternLength += pattern[i];
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}
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if (total < patternLength) {
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// If we don't even have one pixel per unit of bar width, assume this is too small
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// to reliably match, so fail:
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return INT_MAX;
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}
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// We're going to fake floating-point math in integers. We just need to use more bits.
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// Scale up patternLength so that intermediate values below like scaledCounter will have
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// more "significant digits"
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unsigned int unitBarWidth = (total << INTEGER_MATH_SHIFT) / patternLength;
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maxIndividualVariance = (maxIndividualVariance * unitBarWidth) >> INTEGER_MATH_SHIFT;
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unsigned int totalVariance = 0;
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for (int x = 0; x < numCounters; x++) {
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int counter = counters[x] << INTEGER_MATH_SHIFT;
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int scaledPattern = pattern[x] * unitBarWidth;
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int variance = counter > scaledPattern ? counter - scaledPattern : scaledPattern - counter;
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if (variance > maxIndividualVariance) {
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return INT_MAX;
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}
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totalVariance += variance;
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}
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return totalVariance / total;
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}
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unsigned int totalVariance = 0;
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for (int x = 0; x < numCounters; x++) {
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int counter = counters[x] << INTEGER_MATH_SHIFT;
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int scaledPattern = pattern[x] * unitBarWidth;
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int variance = counter > scaledPattern ? counter - scaledPattern : scaledPattern - counter;
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if (variance > maxIndividualVariance) {
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return INT_MAX;
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}
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totalVariance += variance;
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}
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return totalVariance / total;
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}
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bool OneDReader::recordPattern(Ref<BitArray> row, int start, int counters[], int countersCount) {
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int numCounters = countersCount;//sizeof(counters) / sizeof(int);
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for (int i = 0; i < numCounters; i++) {
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counters[i] = 0;
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}
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int end = row->getSize();
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if (start >= end) {
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return false;
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}
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bool isWhite = !row->get(start);
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int counterPosition = 0;
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int i = start;
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while (i < end) {
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bool pixel = row->get(i);
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if (pixel ^ isWhite) { // that is, exactly one is true
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counters[counterPosition]++;
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} else {
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counterPosition++;
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if (counterPosition == numCounters) {
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break;
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} else {
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counters[counterPosition] = 1;
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isWhite ^= true; // isWhite = !isWhite;
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}
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}
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i++;
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}
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// If we read fully the last section of pixels and filled up our counters -- or filled
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// the last counter but ran off the side of the image, OK. Otherwise, a problem.
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if (!(counterPosition == numCounters || (counterPosition == numCounters - 1 && i == end))) {
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return false;
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}
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return true;
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}
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bool OneDReader::recordPattern(Ref<BitArray> row, int start, int counters[], int countersCount) {
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int numCounters = countersCount;//sizeof(counters) / sizeof(int);
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for (int i = 0; i < numCounters; i++) {
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counters[i] = 0;
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}
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int end = row->getSize();
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if (start >= end) {
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return false;
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}
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bool isWhite = !row->get(start);
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int counterPosition = 0;
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int i = start;
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while (i < end) {
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bool pixel = row->get(i);
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if (pixel ^ isWhite) { // that is, exactly one is true
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counters[counterPosition]++;
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} else {
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counterPosition++;
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if (counterPosition == numCounters) {
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break;
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} else {
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counters[counterPosition] = 1;
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isWhite ^= true; // isWhite = !isWhite;
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}
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}
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i++;
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}
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// If we read fully the last section of pixels and filled up our counters -- or filled
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// the last counter but ran off the side of the image, OK. Otherwise, a problem.
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if (!(counterPosition == numCounters || (counterPosition == numCounters - 1 && i == end))) {
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return false;
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}
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return true;
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}
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OneDReader::~OneDReader() {
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}
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}
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OneDReader::~OneDReader() {
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}
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}
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}
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