private static BitMatrix extractPureBits(BitMatrix bitmatrix) throws NotFoundException {
int ai[] = bitmatrix.getTopLeftOnBit();
int ai1[] = bitmatrix.getBottomRightOnBit();
if (ai == null || ai1 == null) {
throw NotFoundException.getNotFoundInstance();
}
int l = moduleSize(ai, bitmatrix);
int i1 = ai[1];
int i = ai1[1];
int j1 = ai[0];
int k1 = ((ai1[0] - j1) + 1) / l;
int l1 = ((i - i1) + 1) / l;
if (k1 <= 0 || l1 <= 0) {
throw NotFoundException.getNotFoundInstance();
}
int i2 = l >> 1;
BitMatrix bitmatrix1 = new BitMatrix(k1, l1);
for (int j = 0; j < l1; j++) {
for (int k = 0; k < k1; k++) {
if (bitmatrix.get(k * l + (j1 + i2), i1 + i2 + j * l)) {
bitmatrix1.set(k, j);
}
}
}
return bitmatrix1;
}
/**
* This method detects a code in a "pure" image -- that is, pure monochrome image which contains
* only an unrotated, unskewed, image of a code, with some white border around it. This is a
* specialized method that works exceptionally fast in this special case.
*
* @see com.google.zxing.pdf417.PDF417Reader#extractPureBits(BitMatrix)
* @see com.google.zxing.datamatrix.DataMatrixReader#extractPureBits(BitMatrix)
*/
private static BitMatrix extractPureBits(BitMatrix image) throws NotFoundException {
int[] leftTopBlack = image.getTopLeftOnBit();
int[] rightBottomBlack = image.getBottomRightOnBit();
if (leftTopBlack == null || rightBottomBlack == null) {
throw NotFoundException.getNotFoundInstance();
}
int moduleSize = moduleSize(leftTopBlack, image);
int top = leftTopBlack[1];
int bottom = rightBottomBlack[1];
int left = leftTopBlack[0];
int right = rightBottomBlack[0];
if (bottom - top != right - left) {
// Special case, where bottom-right module wasn't black so we found
// something else in
// the last row
// Assume it's a square, so use height as the width
right = left + (bottom - top);
}
int matrixWidth = (right - left + 1) / moduleSize;
int matrixHeight = (bottom - top + 1) / moduleSize;
if (matrixWidth <= 0 || matrixHeight <= 0) {
throw NotFoundException.getNotFoundInstance();
}
if (matrixHeight != matrixWidth) {
// Only possibly decode square regions
throw NotFoundException.getNotFoundInstance();
}
// Push in the "border" by half the module width so that we start
// sampling in the middle of the module. Just in case the image is a
// little off, this will help recover.
int nudge = moduleSize >> 1;
top += nudge;
left += nudge;
// Now just read off the bits
BitMatrix bits = new BitMatrix(matrixWidth, matrixHeight);
for (int y = 0; y < matrixHeight; y++) {
int iOffset = top + y * moduleSize;
for (int x = 0; x < matrixWidth; x++) {
if (image.get(left + x * moduleSize, iOffset)) {
bits.set(x, y);
}
}
}
return bits;
}
/**
* This method detects a code in a "pure" image -- that is, pure monochrome image which contains
* only an unrotated, unskewed, image of a code, with some white border around it. This is a
* specialized method that works exceptionally fast in this special case.
*
* @see com.google.zxing.pdf417.PDF417Reader#extractPureBits(BitMatrix)
* @see com.google.zxing.qrcode.QRCodeReader#extractPureBits(BitMatrix)
*/
private static BitMatrix extractPureBits(BitMatrix image) throws NotFoundException {
int[] leftTopBlack = image.getTopLeftOnBit();
int[] rightBottomBlack = image.getBottomRightOnBit();
if (leftTopBlack == null || rightBottomBlack == null) {
throw NotFoundException.getNotFoundInstance();
}
int moduleSize = moduleSize(leftTopBlack, image);
int top = leftTopBlack[1];
int bottom = rightBottomBlack[1];
int left = leftTopBlack[0];
int right = rightBottomBlack[0];
int matrixWidth = (right - left + 1) / moduleSize;
int matrixHeight = (bottom - top + 1) / moduleSize;
if (matrixWidth == 0 || matrixHeight == 0) {
throw NotFoundException.getNotFoundInstance();
}
// Push in the "border" by half the module width so that we start
// sampling in the middle of the module. Just in case the image is a
// little off, this will help recover.
int nudge = moduleSize >> 1;
top += nudge;
left += nudge;
// Now just read off the bits
BitMatrix bits = new BitMatrix(matrixWidth, matrixHeight);
for (int y = 0; y < matrixHeight; y++) {
int iOffset = top + y * moduleSize;
for (int x = 0; x < matrixWidth; x++) {
if (image.get(left + x * moduleSize, iOffset)) {
bits.set(x, y);
}
}
}
return bits;
}
/**
* This method detects a code in a "pure" image -- that is, pure monochrome image which contains
* only an unrotated, unskewed, image of a code, with some white border around it. This is a
* specialized method that works exceptionally fast in this special case.
*
* @see com.google.zxing.datamatrix.DataMatrixReader#extractPureBits(BitMatrix)
*/
private static BitMatrix extractPureBits(BitMatrix image) throws NotFoundException {
int[] leftTopBlack = image.getTopLeftOnBit();
int[] rightBottomBlack = image.getBottomRightOnBit();
if (leftTopBlack == null || rightBottomBlack == null) {
throw NotFoundException.getNotFoundInstance();
}
float moduleSize = moduleSize(leftTopBlack, image);
int top = leftTopBlack[1];
int bottom = rightBottomBlack[1];
int left = leftTopBlack[0];
int right = rightBottomBlack[0];
// Sanity check!
if (left >= right || top >= bottom) {
throw NotFoundException.getNotFoundInstance();
}
if (bottom - top != right - left) {
// Special case, where bottom-right module wasn't black so we found
// something else in the last row
// Assume it's a square, so use height as the width
right = left + (bottom - top);
}
int matrixWidth = Math.round((right - left + 1) / moduleSize);
int matrixHeight = Math.round((bottom - top + 1) / moduleSize);
if (matrixWidth <= 0 || matrixHeight <= 0) {
throw NotFoundException.getNotFoundInstance();
}
if (matrixHeight != matrixWidth) {
// Only possibly decode square regions
throw NotFoundException.getNotFoundInstance();
}
// Push in the "border" by half the module width so that we start
// sampling in the middle of the module. Just in case the image is a
// little off, this will help recover.
int nudge = (int) (moduleSize / 2.0f);
top += nudge;
left += nudge;
// But careful that this does not sample off the edge
int nudgedTooFarRight = left + (int) ((matrixWidth - 1) * moduleSize) - (right - 1);
if (nudgedTooFarRight > 0) {
if (nudgedTooFarRight > nudge) {
// Neither way fits; abort
throw NotFoundException.getNotFoundInstance();
}
left -= nudgedTooFarRight;
}
int nudgedTooFarDown = top + (int) ((matrixHeight - 1) * moduleSize) - (bottom - 1);
if (nudgedTooFarDown > 0) {
if (nudgedTooFarDown > nudge) {
// Neither way fits; abort
throw NotFoundException.getNotFoundInstance();
}
top -= nudgedTooFarDown;
}
// Now just read off the bits
BitMatrix bits = new BitMatrix(matrixWidth, matrixHeight);
for (int y = 0; y < matrixHeight; y++) {
int iOffset = top + (int) (y * moduleSize);
for (int x = 0; x < matrixWidth; x++) {
if (image.get(left + (int) (x * moduleSize), iOffset)) {
bits.set(x, y);
}
}
}
return bits;
}
