Leaked source code of windows server 2003
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/****************************************************************************/
/* abdapi.h */
/* */
/* Bitmap Decompression API header file */
/* */
/* Copyright(C) Microsoft Corporation 1997-1999 */
/****************************************************************************/
#ifndef _H_ABDAPI
#define _H_ABDAPI
/****************************************************************************/
/* RLE codes */
/****************************************************************************/
/* */
/* The following codes fill a full single byte address space. The approach */
/* is to use the high order bits to identify the code type and the low */
/* order bits to encode the length of the associated run. There are two */
/* forms of order */
/* - regular orders which have a 5 bit length field (31 bytes of data) */
/* - "lite" orders with a 4 bit length */
/* */
/* A value of 0 in the length field indicates an extended length, where */
/* the following byte contains the length of the data. There is also a */
/* "mega mega" form which has a two byte length field. (See end of */
/* codespace of the codes that define the megamega form). */
/* */
/* A set of codes at the high end of the address space is used to encode */
/* commonly occuring short sequences, in particular */
/* - certain single byte FGBG codings */
/* - single bytes of BLACK and WHITE */
/* */
/* */
/* SUMMARY */
/* ******* */
/* 7 6 5 4 3 2 1 0 76543210 76543210 76543210 */
/* */
/* MEGA_BG_RUN 0 0 0 0 0 0 0 0 <length> */
/* */
/* BG_RUN 0 0 0 <length-> */
/* */
/* MEGA_FG_RUN 0 0 1 0 0 0 0 0 <length> */
/* */
/* FG_RUN 0 0 1 <length-> */
/* */
/* MEGA_FG_BG_IMAGE 0 1 0 0 0 0 0 0 <length> <-data-> ... */
/* */
/* FG_BG_IMAGE 0 1 0 <length-> <-data-> ... */
/* */
/* MEGA_COLOR_RUN 0 1 1 0 0 0 0 0 <length> <-color> */
/* */
/* COLOR_RUN 0 1 1 <length-> <color-> */
/* */
/* MEGA_COLOR_IMAGE 1 0 0 0 0 0 0 0 <length> <-data-> ... */
/* */
/* COLOR_IMAGE 1 0 0 <length-> <-data-> ... */
/* */
/* MEGA_PACKED_CLR_IMG 1 0 1 0 0 0 0 0 <length> <-data-> ... */
/* */
/* PACKED COLOR IMAGE 1 0 1 <length-> <-data-> ... */
/* */
/* SET_FG_MEGA_FG_RUN 1 1 0 0 0 0 0 0 <length> <-color> */
/* */
/* SET_FG_FG_RUN 1 1 0 0 <-len-> <color-> */
/* */
/* SET_FG_MEGA_FG_BG 1 1 0 1 0 0 0 0 <length> <-color> <-data-> ... */
/* */
/* SET_FG_FG_BG 1 1 0 1 <-len-> <color-> <-data-> ... */
/* */
/* MEGA_DITHERED_RUN 1 1 1 0 0 0 0 0 <length> <-data-> <-data-> */
/* */
/* DITHERED_RUN 1 1 1 0 <-len-> <-data-> <-data-> */
/* */
/* MEGA_MEGA_BG_RUN 1 1 1 1 0 0 0 0 */
/* */
/* MEGA_MEGA_FG_RUN 1 1 1 1 0 0 0 1 */
/* */
/* MEGA_MEGA_FGBG 1 1 1 1 0 0 1 0 */
/* */
/* MEGA_MEGA_COLOR_RUN 1 1 1 1 0 0 1 1 */
/* */
/* MEGA_MEGA_CLR_IMG 1 1 1 1 0 1 0 0 */
/* */
/* MEGA_MEGA_PACKED_CLR 1 1 1 1 0 1 0 1 */
/* */
/* MEGA_MEGA_SET_FG_RUN 1 1 1 1 0 1 1 0 */
/* */
/* MEGA_MEGA_SET_FGBG 1 1 1 1 0 1 1 1 */
/* */
/* MEGA_MEGA_DITHER 1 1 1 1 1 0 0 0 */
/* */
/* Special FGBG code 1 1 1 1 1 1 0 0 1 FGBG code 0x03 = 11000000 */
/* (Note that 0x01 will generally handled by the single pel insertion code) */
/* */
/* Special FBBG code 2 1 1 1 1 1 0 1 0 FGBG code 0x05 = 10100000 */
/* */
/* Special FBBG code 3 1 1 1 1 1 0 1 1 FGBG code 0x07 = 11100000 */
/* */
/* Special FBBG code 4 1 1 1 1 1 1 0 0 FGBG code 0x0F = 11110000 */
/* */
/* BLACK 1 1 1 1 1 1 0 1 */
/* */
/* WHITE 1 1 1 1 1 1 1 0 */
/* */
/* START_LOSSY 1 1 1 1 1 1 1 1 */
/* */
/* */
/****************************************************************************/
/* GENERAL NOTES */
/****************************************************************************/
/* */
/* - For MEGA runs the length encoded is the length of the run minus the */
/* maximum length of the non-mega form. */
/* In the mega-mega form we encode the plain 16 bit length, to keep */
/* encoding/deconding simple. */
/* */
/* - The sequence BG_RUN,BG_RUN is not exactly what it appears. We */
/* use the fact that this is not generated in normal encoding to */
/* encode <n background><1 foreground><n background>. The same pel */
/* insertion convention applies to any combination of MEGA_BG run and */
/* BG_RUN */
/* */
/* - A packed image is encoded when we find that all the color fields in a */
/* run have 0 in the high order nibble. We do not currently use this code */
/* for 8 bit compression, but it is supported by the V2 decoder. */
/* */
/* - The set fg color code (Used to exist in V1) has been retired in favor */
/* of separate commands for those codes that may embed a color. Generally*/
/* This saves one byte for every foreground color transition for 8bpp. */
/* */
/* - The color run code is new for V2. It indicates a color run where the */
/* XOR is not performed. This applies to, for example, the line of bits */
/* immediately below a text line. (There is no special case for runs of */
/* the bg color - these are treated as any other color run.) */
/* */
/* - Observation shows a high occurrence of BG runs split by single FGBG */
/* codes. In decreasing probability these are 3,5,7,9,f,11,1f,3f (1 is */
/* handled by the implicit BG run break). Save 1 byte by encoding as */
/* single codes */
/* */
/* - There is a relatively high occurrence of single pel color codes ff and */
/* 00. Save 1 byte by encoding as special characters */
/* */
/* - The length in a FGBG run is slightly strange. Because they generally */
/* occur in multiples of 8 bytes we get a big saving if we encode the */
/* length of a short run as length/8. However, for those special */
/* cases where the length is not a multiple of 8 we encode a long run. */
/* Therefore the long form can only cover the range 1-256 bytes. */
/* beyond that we use the mega-mega form. */
/* */
/****************************************************************************/
/* DETAILS OF COMPRESSION CODES */
/****************************************************************************/
/* */
/* BG_RUN */
/* */
/* Represents a background run (black:0) of the specified length. */
/* */
/****************************************************************************/
/* */
/* FG_BG_IMAGE/SET_FG_FG_BG_IMAGE */
/* */
/* Represents a binary image containing only the current foreground(1) and */
/* background(0) colors. */
/* */
/****************************************************************************/
/* */
/* FG_RUN/SET_FG_FG_RUN */
/* */
/* Represents a continuous foreground run of the specified length. */
/* The foreground color is white by default, and is changed by the */
/* SET_FG_FG_RUN version of this code. */
/* */
/****************************************************************************/
/* */
/* DITHERED_RUN */
/* */
/* Represents a run of alternating colors of the specified length. */
/* */
/****************************************************************************/
/* */
/* COLOR_IMAGE */
/* */
/* Represents a color image of the specified length. No XOR is performed. */
/* This data is uncompressed, so we hope that we won't see */
/* many of these codes! */
/* */
/****************************************************************************/
/* */
/* COLOR_RUN */
/* */
/* Represents a color run of the specified length. No XOR is performed. */
/* Since the color is not XORed, it is unlikely to match the running */
/* foreground color information. Therefore this code always carries a */
/* color byte and there is no SET_FG_COLOR_RUN form of the code. */
/* */
/****************************************************************************/
/* */
/* PACKED_COLOR_IMAGE */
/* */
/* Represents a color image of the specified length, with pairs of colors */
/* packed into a single byte. (This can only be done when the color info */
/* is zero in the high order nibble.) */
/* */
/****************************************************************************/
/* */
/* START_LOSSY */
/* */
/* Informs the decoder that lossy mode has been established and any of the */
/* following color runs will need pixel doubling performing. */
/* RLE decoding will remain in this mode until the end of this block */
/* */
/****************************************************************************/
#define CODE_MASK 0xE0
#define CODE_MASK_LITE 0xF0
#define CODE_BG_RUN 0x00 /* 20 */
#define CODE_FG_RUN 0x20 /* 20 */
#define CODE_FG_BG_IMAGE 0x40 /* 20 */
#define CODE_COLOR_RUN 0x60 /* 20 */
#define CODE_COLOR_IMAGE 0x80 /* 20 */
#ifndef DC_HICOLOR
#define CODE_PACKED_COLOR_IMAGE 0xA0 /* 20 */
#endif
#define CODE_SET_FG_FG_RUN 0xC0 /* 10 */
#define CODE_SET_FG_FG_BG 0xD0 /* 10 */
#define CODE_DITHERED_RUN 0xE0 /* 10 */
#define CODE_MEGA_MEGA_BG_RUN 0xF0
#define CODE_MEGA_MEGA_FG_RUN 0xF1
#define CODE_MEGA_MEGA_FGBG 0xF2
#define CODE_MEGA_MEGA_COLOR_RUN 0xF3
#define CODE_MEGA_MEGA_CLR_IMG 0xF4
#ifndef DC_HICOLOR
#define CODE_MEGA_MEGA_PACKED_CLR 0xF5
#endif
#define CODE_MEGA_MEGA_SET_FG_RUN 0xF6
#define CODE_MEGA_MEGA_SET_FGBG 0xF7
#define CODE_MEGA_MEGA_DITHER 0xF8
#define CODE_SPECIAL_FGBG_1 0xF9
#define CODE_SPECIAL_FGBG_2 0xFA
#ifndef DC_HICOLOR
#define CODE_SPECIAL_FGBG_3 0xFB
#define CODE_SPECIAL_FGBG_4 0xFC
#endif
#define CODE_WHITE 0xFD
#define CODE_BLACK 0xFE
#define CODE_START_LOSSY 0xFF
#define MAX_LENGTH_ORDER 31
#define MAX_LENGTH_LONG_ORDER 287
#define MAX_LENGTH_ORDER_LITE 15
#define MAX_LENGTH_LONG_ORDER_LITE 271
#define MAX_LENGTH_FGBG_ORDER (31*8)
#define MAX_LENGTH_FGBG_ORDER_LITE (15*8)
#define MAX_LENGTH_LONG_FGBG_ORDER 255
/****************************************************************************/
/* The special FGBG codes that correspond to codes F0-F7 */
/****************************************************************************/
#define SPECIAL_FGBG_CODE_1 0x03
#define SPECIAL_FGBG_CODE_2 0x05
#define SPECIAL_FGBG_CODE_3 0x07
#define SPECIAL_FGBG_CODE_4 0x0F
/****************************************************************************/
/* */
/* TYPES */
/* */
/****************************************************************************/
/****************************************************************************/
/* The Compressed Data header structure. */
/****************************************************************************/
typedef struct _CD_HEADER
{
DCUINT16 cbCompFirstRowSize;
DCUINT16 cbCompMainBodySize;
DCUINT16 cbScanWidth;
DCUINT16 cbUncompressedSize;
} CD_HEADER;
typedef CD_HEADER *PCD_HEADER;
/****************************************************************************/
/* */
/* FUNCTIONS */
/* */
/****************************************************************************/
HRESULT DCAPI BD_DecompressBitmap( PDCUINT8 pCompressedData,
PDCUINT8 pDstBitmap,
DCUINT srcDataSize,
DCUINT dstBufferSize,
DCUINT noBCHeader,
DCUINT8 bitmapBitsPerPel,
DCUINT16 bitmapWidth,
DCUINT16 bitmapHeight );
#endif /* H_ABDAPI */