From afb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c Mon Sep 17 00:00:00 2001 From: jtg Date: Thu, 19 Aug 1999 00:55:39 +0000 Subject: Initial revision --- progs/util/imagesgi.cpp | 369 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 369 insertions(+) create mode 100644 progs/util/imagesgi.cpp (limited to 'progs/util/imagesgi.cpp') diff --git a/progs/util/imagesgi.cpp b/progs/util/imagesgi.cpp new file mode 100644 index 0000000000..f5128aabec --- /dev/null +++ b/progs/util/imagesgi.cpp @@ -0,0 +1,369 @@ +/****************************************************************************** +** 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 +#include +#include +#include +#include + +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; irowStart[i]); + for(i=0; irowSize[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; iheader.ysize; i++) + { + switch(raw->header.zsize) + { + case 1: + ImageSgiRawGetRow(raw, raw->chan0, i, 0); + for(j=0; jheader.xsize; j++) + *(ptr++) = raw->chan0[j]; + break; + case 2: + ImageSgiRawGetRow(raw, raw->chan0, i, 0); + ImageSgiRawGetRow(raw, raw->chan1, i, 1); + for(j=0; jheader.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; jheader.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; jheader.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 + -- cgit v1.2.3