Application: gvSIG desktop

/********************************************************** 

** Copyright 1999 Earth Resource Mapping Pty Ltd.

** This document contains unpublished source code of

** Earth Resource Mapping Pty Ltd. This notice does

** not indicate any intention to publish the source

** code contained herein.

** 

** FILE:           NCSECWCompessClient.h

** CREATED:        Thu 19/08/1999

** AUTHOR:         Simon Cope

** PURPOSE:        Public Interface library to compress ECW v2.0 image files

** EDITS:

** [01] sjc 08Dec1999        Updated comments

**

********************************************************/

/** @file NCSECWCompressClient.h */

#ifndef NCSECWCOMPRESSCLIENT_H

#define NCSECWCOMPRESSCLIENT_H

#ifndef NCSECWCLIENT_H

#include "NCSECWClient.h"

#endif

#ifdef __cplusplus

extern "C" {

#endif

#ifndef NCSTYPES_H

#include "NCSTypes.h"

#endif

#ifndef NCSERRORS_H

#include "NCSErrors.h"

#endif

#define ERSWAVE_VERSION 2

#define ERSWAVE_VERSION_STRING        "2.0"                /* should be in sync with the above */

/** 

 *  @enum

 *        An enumerated type specifying the format of the compressed data. Currently greyscale, RGB

 *        and luminance-chrominance formats are supported.  This will later need expanding to include 

 *        multiband formats such as CMYK.

 */

typedef enum {

        /** The compressed data is unformatted */

        COMPRESS_NONE                = NCSCS_NONE,

        /** Greyscale format, single band */

        COMPRESS_UINT8                = NCSCS_GREYSCALE,

        /** JPEG standard YUV digital format, three band */

        COMPRESS_YUV                = NCSCS_YUV,

        /** Multiband format */

        COMPRESS_MULTI                = NCSCS_MULTIBAND,

        /** RGB images (converted to COMPRESS_YUV internally) */

        COMPRESS_RGB                = NCSCS_sRGB                        

} CompressFormat;

/**        

 *        @enum

 *        An enumerated type allowing the user to hint at an appropriate compression scheme.  The 

 *        value is a guideline for the SDK compression functions.

 */

typedef enum {

        /** No compression hint */

        COMPRESS_HINT_NONE        = 0,

        /** Do the fastest compression possible */

        COMPRESS_HINT_FAST        = 1,

        /** Try to achieve the maximum possible compression ratio */

        COMPRESS_HINT_BEST        = 2,

        /** Optimise compression process for later Internet use of the compressed file */

        COMPRESS_HINT_INTERNET = 3

} CompressHint;

/** @def Maximum length of a datum definition string */

#define ECW_MAX_DATUM_LEN                16

/** @def Maximum length of a projection definition string */

#ifndef ECW_MAX_PROJECTION_LEN

#define ECW_MAX_PROJECTION_LEN        16

#endif

/** @def X dimension of the default (and preferred) block size */

#define X_BLOCK_SIZE        64

/** @def Y dimension of the default (and preferred) block size */

#define        Y_BLOCK_SIZE        64

/** 

 *        @struct

 *        This structure contains information used when compressing raster data 

 *        to an output ECW file.  Most of the values have sensible defaults so users

 *        need only customise those of significance to their application.  Certain 

 *        of these values must always be specified in the client code, namely 

 *        fTargetCompression, nInOutSizeX, nInOutSizeY, nInputBands, and pReadCallback.

 *

 *        Once compression is complete certain statistics are calculated and added 

 *        to this structure.  These include the time taken, the output file size in 

 *        bytes, the actual compression ratio achieved, and the MB/s throughput of the 

 *        process.

 */

typedef struct NCSEcwCompressClient {

        /*

        ** These fields are populated by the compression client

        */

        /** If this is specified but the output file is not, a default output filename will be created.

         *        Otherwise this field is unused.

         */

        char        szInputFilename[MAX_PATH];                        

        /** An output filename must be specified if no input filename is specified */

        char        szOutputFilename[MAX_PATH];        

        /** The target compression ratio - must be specified */

        IEEE4                        fTargetCompression;

        /**        The compression format to use.  See the related enumerated type definition */

        CompressFormat        eCompressFormat;

        /** A guideline for an appropriate compression scheme to use.  This currently has 

         *        no effect, though the default value is COMPRESS_HINT_INTERNET.  Reserved for

         *        future use, see the related enumerated type definition 

         */

        CompressHint        eCompressHint;

        /** X dimension of the block size to use.  Can be 64, 128, 256, 512, 1024, or 2048.

         *        The default for these is set to 64 which produces preferred performance over the internet.

         */

        UINT32                        nBlockSizeX;

        /** Y dimension of the block size to use.  Can be 64, 128, 256, 512, 1024, or 2048.

         *        The default for these is set to 64 which produces preferred performance over the internet.

         */

        UINT32                        nBlockSizeY;                                /* Y Block size (64, 128, 256, 512)                                        */

        /** Number of cells of input data and compressed file in the X direction - must be specified */

        UINT32                        nInOutSizeX;

        /** Number of cells of input data and compressed file in the Y direction - must be specified */

        UINT32                        nInOutSizeY;

        /** Number of bands in the input data - must be specified */

        UINT32                        nInputBands;

        /** Number of bands in the output file - should not generally be specified */

        UINT32                        nOutputBands;

        /** Size of the input file in bytes - should not be specified, it will be determined automatically. */

        UINT64                        nInputSize;

        /** Optional field specifying the cell size in the X direction in eCellSizeUnits */

        IEEE8                        fCellIncrementX;

        /** Optional field specifying the cell size in the Y direction in eCellSizeUnits */

        IEEE8                        fCellIncrementY;

        /** Optional field specifying the X world origin of the input data in eCellSizeUnits */

        IEEE8                        fOriginX;

        /** Optional field specifying the Y world origin of the input data in eCellSizeUnits */

        IEEE8                        fOriginY;

        /** Optional field specifying the units in which world cell sizes are specified, e.g. meters, feet */

        CellSizeUnits        eCellSizeUnits;

        /** ER Mapper GDT style datum string */

        char                        szDatum[ECW_MAX_DATUM_LEN];

        /** ER Mapper GDT style projection string */

        char                        szProjection[ECW_MAX_PROJECTION_LEN];

        /** Callback function used to obtain lines of band data from the input data - must be specified */

        BOOLEAN                        (*pReadCallback) (struct NCSEcwCompressClient *pClient,

                                                                          UINT32 nNextLine,

                                                                          IEEE4 **ppInputArray);

        /** Optional status callback function to track the progress of the compression process */

        void                        (*pStatusCallback) (struct NCSEcwCompressClient *pClient,

                                                                                UINT32 nCurrentLine);                                

        /** Optional cancel callback function which can be used to cancel a compression process */

        BOOLEAN                        (*pCancelCallback) (struct NCSEcwCompressClient *pClient);

        /** (void *) Pointer to any private data you need to access in the three callback functions */

        void                        *pClientData;

        /** Created by NCSEcwCompressOpen() */

        struct                        EcwCompressionTask *pTask;

        /*

        ** The remaining fields are populated by NCSEcwCompressClose() 

        */

        /** Actual compression rate achieved - ratio of input data size to output file size */

        IEEE4                        fActualCompression;

        /** Time taken to perform the complete compression, in seconds */

        IEEE8                        fCompressionSeconds;

        /** MB/s throughput during the compression process */

        IEEE8                        fCompressionMBSec;

        /** Total size of the output file in bytes */

        UINT64                        nOutputSize;

} NCSEcwCompressClient;

/** 

 *        Allocate a new CompressionClient structure and fill in defaults 

 *

 *        @return                                        A pointer to memory allocated to an NCSEcwCompressClient structure

 */

NCSEcwCompressClient * NCS_CALL NCSEcwCompressAllocClient(void);

/**        

 *        Having set compression parameters, initialise the compression process

 *

 *        @param[in,out]        pInfo                                The NCSEcwCompressClient structure containing the compression parameters 

 *        @param[in]                bCalculateSizesOnly        Which output statistics to calculate 

 *        @return                                                                NCSError value, NCS_SUCCESS or any applicable error code

 */

NCSError NCS_CALL NCSEcwCompressOpen(NCSEcwCompressClient *pInfo, BOOLEAN bCalculateSizesOnly); 

/**        

 *        Start the compression process based on these parameters

 *

 *        @param[in,out]        pInfo                                The NCSEcwCompressClient structure for this compression process

 *        @return                                                                NCSError value, NCS_SUCCESS or any applicable error code

 */

NCSError NCS_CALL NCSEcwCompress(NCSEcwCompressClient *pInfo);

/** 

 *        Having completed compression, close, calculate output statistics, and clean up

 *

 *        @param[in,out]        pInfo                                The NCSEcwCompressClient structure for this compression process

 *        @return                                                                NCSError value, NCS_SUCCESS or any applicable error code

 */

NCSError NCS_CALL NCSEcwCompressClose(NCSEcwCompressClient *pInfo);

/**        

 *        Free the memory allocated to the NCSEcwCompressClient structure

 *

 *        @param[in,out]        pInfo                                The structure to free

 *        @return                                                                NCSError value, NCS_SUCCESS or any applicable error code

 */

NCSError NCS_CALL NCSEcwCompressFreeClient(NCSEcwCompressClient *pInfo);

typedef struct {

        UINT8                                nVersion;                        // ECW file version == ERSWAVE_VERSION

        CellSizeUnits                eCellSizeUnits;                // Units used for pixel size

        IEEE8                                fCellIncrementX;        // Increment in CellSizeUnits in X direction. May be negative. Will never be zero

        IEEE8                                fCellIncrementY;        // Increment in CellSizeUnits in Y direction. May be negative. Will never be zero

        IEEE8                                fOriginX;                        // World X origin for top-left corner of top-left cell, in CellSizeUnits

        IEEE8                                fOriginY;                        // World Y origin for top-left corner of top-left cell, in CellSizeUnits

        char                                *szDatum;                        // ER Mapper style Datum name string, e.g. "RAW" or "NAD27". Will never be NULL

        char                                *szProjection;                // ER Mapper style Projection name string, e.g. "RAW" or "WGS84". Will never be NULL

        BOOLEAN                                bCompressedOffsetTable; // Is the block table compressed

} NCSEcwEditInfo;

NCSError NCS_CALL NCSEcwEditReadInfo(char *pFilename, NCSEcwEditInfo **ppInfo);

NCSError NCS_CALL NCSEcwEditWriteInfo(char *pFilename, NCSEcwEditInfo *pInfo, void (*pProgressFunc)(UINT64 nTotal, UINT64 nWritten, void *pClientData), BOOLEAN (*pCancelFunc)(void *pClientData), void *pClientData);

NCSError NCS_CALL NCSEcwEditFreeInfo(NCSEcwEditInfo *pInfo);

#ifdef __cplusplus

}

#endif

#endif /* NCSECWCOMPRESSCLIENT_H */