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Diffstat (limited to 'kernel/kls_ljpeg/ljpeg2ppm/jpeg.h')
| -rw-r--r-- | kernel/kls_ljpeg/ljpeg2ppm/jpeg.h | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/kernel/kls_ljpeg/ljpeg2ppm/jpeg.h b/kernel/kls_ljpeg/ljpeg2ppm/jpeg.h new file mode 100644 index 0000000..44a41cb --- /dev/null +++ b/kernel/kls_ljpeg/ljpeg2ppm/jpeg.h @@ -0,0 +1,249 @@ +/* + * jpeg.h -- + * + * Basic jpeg data structure definitions. + * + * + * Copyright (C) 1991, 1992, Thomas G. Lane. + * Part of the Independent JPEG Group's software. + * See the file Copyright for more details. + * + * Copyright (c) 1993 Brian C. Smith, The Regents of the University + * of California + * All rights reserved. + * + * Copyright (c) 1994 Kongji Huang and Brian C. Smith. + * Cornell University + * All rights reserved. + * + * Permission to use, copy, modify, and distribute this software and its + * documentation for any purpose, without fee, and without written agreement is + * hereby granted, provided that the above copyright notice and the following + * two paragraphs appear in all copies of this software. + * + * IN NO EVENT SHALL CORNELL UNIVERSITY BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT + * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF CORNELL + * UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * CORNELL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND CORNELL UNIVERSITY HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + */ + +#ifndef _JPEG +#define _JPEG + +typedef unsigned char Uchar; +typedef unsigned short Ushort; +typedef unsigned int Uint; + +/* + * The following structure stores basic information about one component. + */ +typedef struct JpegComponentInfo { + /* + * These values are fixed over the whole image. + * They are read from the SOF marker. + */ + short componentId; /* identifier for this component (0..255) */ + short componentIndex; /* its index in SOF or cPtr->compInfo[] */ + + /* + * Downsampling is not normally used in lossless JPEG, although + * it is permitted by the JPEG standard (DIS). We set all sampling + * factors to 1 in this program. + */ + short hSampFactor; /* horizontal sampling factor */ + short vSampFactor; /* vertical sampling factor */ + + /* + * Huffman table selector (0..3). The value may vary + * between scans. It is read from the SOS marker. + */ + short dcTblNo; +} JpegComponentInfo; + + +/* + * One of the following structures is created for each huffman coding + * table. We use the same structure for encoding and decoding, so there + * may be some extra fields for encoding that aren't used in the decoding + * and vice-versa. + */ +typedef struct HuffmanTable { + /* + * These two fields directly represent the contents of a JPEG DHT + * marker + */ + Uchar bits[17]; + Uchar huffval[256]; + + /* + * This field is used only during compression. It's initialized + * FALSE when the table is created, and set TRUE when it's been + * output to the file. + */ + int sentTable; + + /* + * The remaining fields are computed from the above to allow more + * efficient coding and decoding. These fields should be considered + * private to the Huffman compression & decompression modules. + */ + Ushort ehufco[256]; + char ehufsi[256]; + + Ushort mincode[17]; + int maxcode[18]; + short valptr[17]; + int numbits[256]; + int value[256]; +} HuffmanTable; + +/* + * One of the following structures is used to pass around the + * compression information. + */ +typedef struct CompressInfo { + /* + * Image width, height, and image data precision (bits/sample) + */ + int imageWidth; + int imageHeight; + int dataPrecision; + + /* + * compInfo[i] describes component that appears i'th in SOF + * numComponents is the # of color components in JPEG image. + */ + JpegComponentInfo *compInfo; + short numComponents; + + /* + * *curCompInfo[i] describes component that appears i'th in SOS. + * compsInScan is the # of color components in current scan. + */ + JpegComponentInfo *curCompInfo[4]; + short compsInScan; + + /* + * MCUmembership[i] indexes the i'th component of MCU into the + * curCompInfo array. + */ + short MCUmembership[10]; + + /* + * Pointers to Huffman coding tables, or NULL if not defined. + */ + HuffmanTable *dcHuffTblPtrs[4]; + + /* + * prediction seletion value (PSV) and point transform parameter (Pt) + */ + int Ss; + int Pt; + + /* + * In lossless JPEG, restart interval shall be an integer + * multiple of the number of MCU in a MCU row. + */ + int restartInRows; /*if > 0, MCU rows per restart interval; 0 = no restart*/ + + /* + * These fields are private data for the entropy encoder + */ + int restartRowsToGo; /* MCUs rows left in this restart interval */ + short nextRestartNum; /* # of next RSTn marker (0..7) */ +} CompressInfo; + +/* + * One of the following structures is used to pass around the + * decompression information. + */ +typedef struct DecompressInfo { + /* + * Image width, height, and image data precision (bits/sample) + * These fields are set by ReadFileHeader or ReadScanHeader + */ + int imageWidth; + int imageHeight; + int dataPrecision; + + /* + * compInfo[i] describes component that appears i'th in SOF + * numComponents is the # of color components in JPEG image. + */ + JpegComponentInfo *compInfo; + short numComponents; + + /* + * *curCompInfo[i] describes component that appears i'th in SOS. + * compsInScan is the # of color components in current scan. + */ + JpegComponentInfo *curCompInfo[4]; + short compsInScan; + + /* + * MCUmembership[i] indexes the i'th component of MCU into the + * curCompInfo array. + */ + short MCUmembership[10]; + + /* + * ptrs to Huffman coding tables, or NULL if not defined + */ + HuffmanTable *dcHuffTblPtrs[4]; + + /* + * prediction seletion value (PSV) and point transform parameter (Pt) + */ + int Ss; + int Pt; + + /* + * In lossless JPEG, restart interval shall be an integer + * multiple of the number of MCU in a MCU row. + */ + int restartInterval;/* MCUs per restart interval, 0 = no restart */ + int restartInRows; /*if > 0, MCU rows per restart interval; 0 = no restart*/ + + /* + * these fields are private data for the entropy decoder + */ + int restartRowsToGo; /* MCUs rows left in this restart interval */ + short nextRestartNum; /* # of next RSTn marker (0..7) */ +} DecompressInfo; + +/* + *-------------------------------------------------------------- + * + * swap -- + * + * Swap the contents stored in a and b. + * "type" is the variable type of a and b. + * + * Results: + * The values in a and b are swapped. + * + * Side effects: + * None. + * + *-------------------------------------------------------------- + */ +#define swap(type,a,b) {type c; c=(a); (a)=(b); (b)=c;} + +#define MEMSET(s,c,n) memset((void *)(s),(int)(c),(int)(n)) +#define MEMCPY(s1,s2,n) memcpy((void *)(s1),(void *)(s2),(int)(n)) + +/* + * Lossless JPEG specifies data precision to be from 2 to 16 bits/sample. + */ +#define MinPrecisionBits 2 +#define MaxPrecisionBits 16 +#define MinPrecisionValue 2 +#define MaxPrecisionValue 65535 + +#endif /* _JPEG */ |