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-rw-r--r--progs/util/imagesgi.cpp369
1 files changed, 369 insertions, 0 deletions
diff --git a/progs/util/imagesgi.cpp b/progs/util/imagesgi.cpp
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+++ b/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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