logImageCore.h

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/*
 *   Cineon image file format library definitions.
 *   Cineon and DPX common structures.
 *
 *   This header file contains private details.
 *   User code should generally use cineonlib.h and dpxlib.h only.
 *   Hmm. I thought the two formats would have more in common!
 *
 *   Copyright 1999,2000,2001 David Hodson <hodsond@acm.org>
 *
 *   This program is free software; you can redistribute it and/or modify it
 *   under the terms of the GNU General Public License as published by the Free
 *   Software Foundation; either version 2 of the License, or (at your option)
 *   any later version.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *   or FITNESS FOR A PARTICULAR PURPOSE.    See the GNU General Public License
 *   for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#ifndef _LOG_IMAGE_CORE_H_
#define _LOG_IMAGE_CORE_H_

#include <stdio.h>
#include "logImageLib.h"

#ifdef __cplusplus
extern "C" {
#endif

#include "BLO_sys_types.h" // for intptr_t support

#ifdef _MSC_VER
#undef ntohl
#undef htonl
#endif

typedef int (GetRowFn)(LogImageFile* logImage, unsigned short* row, int lineNum);
typedef int (SetRowFn)(LogImageFile* logImage, const unsigned short* row, int lineNum);
typedef void (CloseFn)(LogImageFile* logImage);

struct _Log_Image_File_t_
{
    /* specified in header */
    int width;
    int height;
    int depth;
    int bitsPerPixel;
    int imageOffset;

    /* file buffer, measured in longwords (4 byte) */
    int lineBufferLength;
    unsigned int* lineBuffer;

    /* pixel buffer, holds 10 bit pixel values */
    unsigned short* pixelBuffer;
    int pixelBufferUsed;

    /* io stuff */
    FILE* file;
    int reading;
    int fileYPos;

    /* byte conversion stuff */
    LogImageByteConversionParameters params;
#if 0
    float gamma;
    int blackPoint;
    int whitePoint;
#endif
    unsigned char lut10[1024];
    unsigned short lut8[256];

    unsigned short lut10_16[1024];
    unsigned short lut16_16[65536];

    /* pixel access functions */
    GetRowFn* getRow;
    SetRowFn* setRow;
    CloseFn* close;
    
    unsigned char *membuffer;
    uintptr_t membuffersize;
    unsigned char *memcursor;
};

void setupLut(LogImageFile*);
void setupLut16(LogImageFile*);

int pixelsToLongs(int numPixels);

/* typedefs used in original docs */
/* note size assumptions! */

typedef unsigned int U32;
typedef unsigned short U16;
typedef unsigned char U8;
typedef signed int S32;
typedef float R32;
typedef char ASCII;

R32 htonf(R32 f);
R32 ntohf(R32 f);
R32 undefined(void);
U16 reverseU16(U16 value);
U32 reverseU32(U32 value);
R32 reverseR32(R32 value);

#ifdef __cplusplus
}
#endif

#endif /* _LOG_IMAGE_CORE_H_ */