| Name | Description |
|---|---|
| AlignmentPatternFinder | This class attempts to find alignment patterns in a QR Code. Alignment patterns look like finder patterns but are smaller and appear at regular intervals throughout the image. At the moment this only looks for the bottom-right alignment pattern. This is mostly a simplified copy of {@link FinderPatternFinder}. It is copied, pasted and stripped down here for maximum performance but does unfortunately duplicate some code. This class is thread-safe but not reentrant. Each thread must allocate its own object. |
| BitMatrixParser | |
| ByteMatrix | JAVAPORT: The original code was a 2D array of ints, but since it only ever gets assigned 0, 1 and 2 I'm going to use less memory and go with bytes. |
| DataMask | Encapsulates data masks for the data bits in a QR code, per ISO 18004:2006 6.8. Implementations of this class can un-mask a raw BitMatrix. For simplicity, they will unmask the entire BitMatrix, including areas used for finder patterns, timing patterns, etc. These areas should be unused after the point they are unmasked anyway. Note that the diagram in section 6.8.1 is misleading since it indicates that i is column position and j is row position. In fact, as the text says, i is row position and j is column position. |
| DecodedBitStreamParser | QR Codes can encode text as bits in one of several modes, and can use multiple modes in one QR Code. This class decodes the bits back into text. See ISO 18004:2006, 6.4.3 - 6.4.7 |
| Encoder | |
| ErrorCorrectionLevel | See ISO 18004:2006, 6.5.1. This enum encapsulates the four error correction levels defined by the QR code standard. |
| FormatInformation | Encapsulates a QR Code's format information, including the data mask used and error correction level. |
| MaskUtil | |
| MatrixUtil | |
| Mode | See ISO 18004:2006, 6.4.1, Tables 2 and 3. This enum encapsulates the various modes in which data can be encoded to bits in the QR code standard. |
| QRCode | |
| Version | See ISO 18004:2006 Annex D |
| Version.ECB | Encapsualtes the parameters for one error-correction block in one symbol version. This includes the number of data codewords, and the number of times a block with these parameters is used consecutively in the QR code version's format. |
| Version.ECBlocks | Encapsulates a set of error-correction blocks in one symbol version. Most versions will use blocks of differing sizes within one version, so, this encapsulates the parameters for each set of blocks. It also holds the number of error-correction codewords per block since it will be the same across all blocks within one version. |