| Метод | Описание | |
|---|---|---|
| Cleanup ( ) : void |
Cleanups the state of the codec. Cleanup is called when codec is no longer needed (won't be used) and can be used for example to restore tag methods that were substituted. |
|
| Init ( ) : bool | ||
| LZWCodec ( Tiff tif, Compression scheme, string name ) : System | ||
| PostEncode ( ) : bool |
Performs any actions after encoding required by the codec. PostEncode is called after encoding and can be used to release any external resources needed during encoding. |
|
| PreDecode ( short plane ) : bool |
Prepares the decoder part of the codec for a decoding. PreDecode is called after TiffCodec.SetupDecode and before decoding. |
|
| PreEncode ( short plane ) : bool |
Prepares the encoder part of the codec for a encoding. PreEncode is called after TiffCodec.SetupEncode and before encoding. |
|
| predictor_decoderow ( byte buffer, int offset, int count, short plane ) : bool | ||
| predictor_decodestrip ( byte buffer, int offset, int count, short plane ) : bool | ||
| predictor_decodetile ( byte buffer, int offset, int count, short plane ) : bool | ||
| predictor_encoderow ( byte buffer, int offset, int count, short plane ) : bool | ||
| predictor_encodestrip ( byte buffer, int offset, int count, short plane ) : bool | ||
| predictor_encodetile ( byte buffer, int offset, int count, short plane ) : bool | ||
| predictor_setupdecode ( ) : bool | ||
| predictor_setupencode ( ) : bool |
| Метод | Описание | |
|---|---|---|
| GetNextCode ( short &code ) : void | ||
| GetNextCodeCompat ( short &code ) : void | ||
| LZWCleanup ( ) : void | ||
| LZWDecode ( byte buffer, int offset, int count, short plane ) : bool | ||
| LZWDecodeCompat ( byte buffer, int offset, int count, short plane ) : bool | ||
| LZWEncode ( byte buffer, int offset, int count, short plane ) : bool |
Encode a chunk of pixels. Uses an open addressing double hashing (no chaining) on the prefix code/next character combination. We do a variant of Knuth's algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime secondary probe. Here, the modular division first probe is gives way to a faster exclusive-or manipulation. Also do block compression with an adaptive reset, whereby the code table is cleared when the compression ratio decreases, but after the table fills. The variable-length output codes are re-sized at this point, and a CODE_CLEAR is generated for the decoder. |
|
| LZWPostEncode ( ) : bool | ||
| LZWPreDecode ( short s ) : bool | ||
| LZWPreEncode ( short s ) : bool | ||
| LZWSetupDecode ( ) : bool | ||
| LZWSetupEncode ( ) : bool | ||
| MAXCODE ( int n ) : int | ||
| NextCode ( short &_code, bool compat ) : void | ||
| PutNextCode ( int c ) : void | ||
| cl_hash ( ) : void | ||
| codeLoop ( ) : void |
| public LZWCodec ( Tiff tif, Compression scheme, string name ) : System | ||
| tif | Tiff | |
| scheme | Compression | |
| name | string | |
| Результат | System | |
| public PreDecode ( short plane ) : bool | ||
| plane | short | The zero-based sample plane index. |
| Результат | bool | |
| public PreEncode ( short plane ) : bool | ||
| plane | short | The zero-based sample plane index. |
| Результат | bool | |
| public predictor_decoderow ( byte buffer, int offset, int count, short plane ) : bool | ||
| buffer | byte | |
| offset | int | |
| count | int | |
| plane | short | |
| Результат | bool | |
| public predictor_decodestrip ( byte buffer, int offset, int count, short plane ) : bool | ||
| buffer | byte | |
| offset | int | |
| count | int | |
| plane | short | |
| Результат | bool | |
| public predictor_decodetile ( byte buffer, int offset, int count, short plane ) : bool | ||
| buffer | byte | |
| offset | int | |
| count | int | |
| plane | short | |
| Результат | bool | |
| public predictor_encoderow ( byte buffer, int offset, int count, short plane ) : bool | ||
| buffer | byte | |
| offset | int | |
| count | int | |
| plane | short | |
| Результат | bool | |
| public predictor_encodestrip ( byte buffer, int offset, int count, short plane ) : bool | ||
| buffer | byte | |
| offset | int | |
| count | int | |
| plane | short | |
| Результат | bool | |
| public predictor_encodetile ( byte buffer, int offset, int count, short plane ) : bool | ||
| buffer | byte | |
| offset | int | |
| count | int | |
| plane | short | |
| Результат | bool | |