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mesa/progs/util/imagesgi.cpp

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/******************************************************************************
** Filename : imageSgi.cpp
** UNCLASSIFIED
**
** Description : Utility to read SGI image format files. This code was
** originally a SGI image loading utility provided with the
** Mesa 3D library @ http://www.mesa3d.org by Brain Paul.
** This has been extended to read all SGI image formats
** (e.g. INT, INTA, RGB, RGBA).
**
** Revision History:
** Date Name Description
** 06/07/99 BRC Initial Release
**
** Note:
**
** The SGI Image Data (if not RLE)
**
** If the image is stored verbatim (without RLE), then image data directly
** follows the 512 byte header. The data for each scanline of the first
** channel is written first. If the image has more than 1 channel, all
** the data for the first channel is written, followed by the remaining
** channels. If the BPC value is 1, then each scanline is written as XSIZE
** bytes. If the BPC value is 2, then each scanline is written as XSIZE
** shorts. These shorts are stored in the byte order described above.
**
******************************************************************************/
#define __IMAGESGI_CPP
#include "imagesgi.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <assert.h>
struct sImageSgiRaw
{
struct sImageSgiHeader header;
unsigned char *chan0;
unsigned char *chan1;
unsigned char *chan2;
unsigned char *chan3;
unsigned int *rowStart;
int *rowSize;
};
// Static routines
static struct sImageSgiRaw *ImageSgiRawOpen(char const * const fileName);
static void ImageSgiRawClose(struct sImageSgiRaw *raw);
static void ImageSgiRawGetRow(struct sImageSgiRaw *raw, unsigned char *buf,
int y, int z);
static void ImageSgiRawGetData(struct sImageSgiRaw *raw, struct sImageSgi
*final);
static void *SwitchEndian16(void *value);
static void *SwitchEndian32(void *value);
// Static variables
FILE *mFp = NULL;
unsigned char *mChanTmp = NULL;
/*****************************************************************************/
struct sImageSgi *ImageSgiOpen(char const * const fileName)
{
struct sImageSgiRaw *raw = NULL;
struct sImageSgi *final = NULL;
raw = ImageSgiRawOpen(fileName);
final = new struct sImageSgi;
assert(final);
if(final)
{
final->header = raw->header;
final->data = NULL;
ImageSgiRawGetData(raw, final);
ImageSgiRawClose(raw);
}
return final;
} // ImageSgiRawOpen
/*****************************************************************************/
void ImageSgiClose(struct sImageSgi *image)
{
if(image)
{
if(image->data)
delete[] image->data;
image->data = NULL;
delete image;
}
image = NULL;
return;
} // ImageSgiClose
/*****************************************************************************/
static struct sImageSgiRaw *ImageSgiRawOpen(char const * const fileName)
{
struct sImageSgiRaw *raw = NULL;
int x;
int i;
bool swapFlag = false;
union
{
int testWord;
char testByte[4];
} endianTest;
endianTest.testWord = 1;
// Determine endianess of platform.
if(endianTest.testByte[0] == 1)
swapFlag = true;
else
swapFlag = false;
raw = new struct sImageSgiRaw;
assert(raw);
if(raw)
{
raw->chan0 = NULL;
raw->chan1 = NULL;
raw->chan2 = NULL;
raw->chan3 = NULL;
raw->rowStart = NULL;
raw->rowSize = NULL;
mFp = fopen(fileName, "rb");
assert(mFp);
fread(&raw->header, sizeof(struct sImageSgiHeader), 1, mFp);
if(swapFlag == true)
{
SwitchEndian16(&raw->header.magic);
SwitchEndian16(&raw->header.type);
SwitchEndian16(&raw->header.dim);
SwitchEndian16(&raw->header.xsize);
SwitchEndian16(&raw->header.ysize);
SwitchEndian16(&raw->header.zsize);
}
mChanTmp = new unsigned char[raw->header.xsize * raw->header.ysize];
assert(mChanTmp);
switch(raw->header.zsize)
{
case 4:
raw->chan3 = new unsigned char[raw->header.xsize *
raw->header.ysize];
assert(raw->chan3);
case 3:
raw->chan2 = new unsigned char[raw->header.xsize *
raw->header.ysize];
assert(raw->chan2);
case 2:
raw->chan1 = new unsigned char[raw->header.xsize *
raw->header.ysize];
assert(raw->chan1);
case 1:
raw->chan0 = new unsigned char[raw->header.xsize *
raw->header.ysize];
assert(raw->chan0);
}
if(raw->header.type == IMAGE_SGI_TYPE_RLE)
{
x = raw->header.ysize * raw->header.zsize * sizeof(unsigned int);
raw->rowStart = new unsigned int[x];
raw->rowSize = new int[x];
fseek(mFp, sizeof(struct sImageSgiHeader), SEEK_SET);
fread(raw->rowStart, 1, x, mFp);
fread(raw->rowSize, 1, x, mFp);
if(swapFlag == true)
{
for(i=0; i<x/sizeof(unsigned int); i++)
SwitchEndian32(&raw->rowStart[i]);
for(i=0; i<x/sizeof(int); i++)
SwitchEndian32(&raw->rowSize[i]);
}
}
}
return raw;
} // ImageSgiRawOpen
/*****************************************************************************/
static void ImageSgiRawClose(struct sImageSgiRaw *raw)
{
fclose(mFp);
mFp = NULL;
if(mChanTmp)
delete[] mChanTmp;
mChanTmp = NULL;
if(raw->chan0)
delete[] raw->chan0;
raw->chan0 = NULL;
if(raw->chan1)
delete[] raw->chan1;
raw->chan1 = NULL;
if(raw->chan2)
delete[] raw->chan2;
raw->chan2 = NULL;
if(raw->chan3)
delete[] raw->chan3;
raw->chan3 = NULL;
if(raw)
delete raw;
raw = NULL;
return;
} // ImageSgiRawClose
/*****************************************************************************/
static void ImageSgiRawGetRow(struct sImageSgiRaw *raw, unsigned char *buf,
int y, int z)
{
unsigned char *iPtr = NULL;
unsigned char *oPtr = NULL;
unsigned char pixel;
int count;
if((raw->header.type & 0xFF00) == 0x0100)
{
fseek(mFp, raw->rowStart[y+z*raw->header.ysize], SEEK_SET);
fread(mChanTmp, 1, (unsigned int)raw->rowSize[y+z*raw->header.ysize],
mFp);
iPtr = mChanTmp;
oPtr = buf;
while(1)
{
pixel = *iPtr++;
count = (int)(pixel & 0x7F);
if(!count)
{
return;
}
if (pixel & 0x80)
{
while (count--)
{
*oPtr++ = *iPtr++;
}
}
else
{
pixel = *iPtr++;
while (count--)
{
*oPtr++ = pixel;
}
}
}
}
else
{
fseek(mFp,
sizeof(struct sImageSgiHeader)+(y*raw->header.xsize) +
(z*raw->header.xsize*raw->header.ysize),
SEEK_SET);
fread(buf, 1, raw->header.xsize, mFp);
}
return;
} // ImageSgiRawGetRow
/*****************************************************************************/
static void ImageSgiRawGetData(struct sImageSgiRaw *raw, struct sImageSgi
*final)
{
unsigned char *ptr = NULL;
int i, j;
final->data =
new unsigned
char[raw->header.xsize*raw->header.ysize*raw->header.zsize];
assert(final->data);
ptr = final->data;
for(i=0; i<raw->header.ysize; i++)
{
switch(raw->header.zsize)
{
case 1:
ImageSgiRawGetRow(raw, raw->chan0, i, 0);
for(j=0; j<raw->header.xsize; j++)
*(ptr++) = raw->chan0[j];
break;
case 2:
ImageSgiRawGetRow(raw, raw->chan0, i, 0);
ImageSgiRawGetRow(raw, raw->chan1, i, 1);
for(j=0; j<raw->header.xsize; j++)
{
*(ptr++) = raw->chan0[j];
*(ptr++) = raw->chan1[j];
}
break;
case 3:
ImageSgiRawGetRow(raw, raw->chan0, i, 0);
ImageSgiRawGetRow(raw, raw->chan1, i, 1);
ImageSgiRawGetRow(raw, raw->chan2, i, 2);
for(j=0; j<raw->header.xsize; j++)
{
*(ptr++) = raw->chan0[j];
*(ptr++) = raw->chan1[j];
*(ptr++) = raw->chan2[j];
}
break;
case 4:
ImageSgiRawGetRow(raw, raw->chan0, i, 0);
ImageSgiRawGetRow(raw, raw->chan1, i, 1);
ImageSgiRawGetRow(raw, raw->chan2, i, 2);
ImageSgiRawGetRow(raw, raw->chan3, i, 3);
for(j=0; j<raw->header.xsize; j++)
{
*(ptr++) = raw->chan0[j];
*(ptr++) = raw->chan1[j];
*(ptr++) = raw->chan2[j];
*(ptr++) = raw->chan3[j];
}
break;
}
}
return;
} // ImageSgiRawGetData
/*****************************************************************************/
static void *SwitchEndian16(void *value)
{
short value16 = *(short *) value;
value16 = ((value16 & 0xff00) >> 8L) +
((value16 & 0x00ff) << 8L);
*(short *)value = value16;
return value;
} // SwitchEndian16
/*****************************************************************************/
static void *SwitchEndian32(void *value)
{
int value32 = *(int *) value;
value32 = ((value32 & 0xff000000) >> 24L) +
((value32 & 0x00ff0000) >> 8) +
((value32 & 0x0000ff00) << 8) +
((value32 & 0x000000ff) << 24L);
*(int *)value = value32;
return value;
} // SwitchEndian32
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