home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
SGI Developer Toolbox 6.1
/
SGI Developer Toolbox 6.1 - Disc 1.iso
/
toolbox
/
src
/
demos
/
OpenGL
/
backtrace
/
rgb.c++
< prev
next >
Wrap
C/C++ Source or Header
|
1996-11-11
|
7KB
|
254 lines
/*
* (c) Copyright 1993, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
*
* US Government Users Restricted Rights
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/gl.h>
#include "rgb.h"
/******************************************************************************/
typedef struct _rawImageRec {
unsigned short imagic;
unsigned short type;
unsigned short dim;
unsigned short sizeX, sizeY, sizeZ;
unsigned long min, max;
unsigned long wasteBytes;
char name[80];
unsigned long colorMap;
FILE *file;
unsigned char *tmp, *tmpR, *tmpG, *tmpB;
unsigned long rleEnd;
GLuint *rowStart;
GLint *rowSize;
} rawImageRec;
/******************************************************************************/
static void ConvertShort(unsigned short *array, long length)
{
unsigned long b1, b2;
unsigned char *ptr;
ptr = (unsigned char *)array;
while (length--) {
b1 = *ptr++;
b2 = *ptr++;
*array++ = (b1 << 8) | (b2);
}
}
static void ConvertLong(GLuint *array, long length)
{
unsigned long b1, b2, b3, b4;
unsigned char *ptr;
ptr = (unsigned char *)array;
while (length--) {
b1 = *ptr++;
b2 = *ptr++;
b3 = *ptr++;
b4 = *ptr++;
*array++ = (b1 << 24) | (b2 << 16) | (b3 << 8) | (b4);
}
}
static rawImageRec *RawImageOpen(char *fileName)
{
union {
int testWord;
char testByte[4];
} endianTest;
rawImageRec *raw;
GLenum swapFlag;
int x;
endianTest.testWord = 1;
if (endianTest.testByte[0] == 1) {
swapFlag = GL_TRUE;
} else {
swapFlag = GL_FALSE;
}
raw = (rawImageRec *)malloc(sizeof(rawImageRec));
if (raw == NULL) {
return NULL;
}
if ((raw->file = fopen(fileName, "rb")) == NULL) {
return NULL;
}
fread(raw, 1, 12, raw->file);
if (swapFlag) {
ConvertShort(&raw->imagic, 6);
}
raw->tmp = (unsigned char *)malloc(raw->sizeX*256);
raw->tmpR = (unsigned char *)malloc(raw->sizeX*256);
raw->tmpG = (unsigned char *)malloc(raw->sizeX*256);
raw->tmpB = (unsigned char *)malloc(raw->sizeX*256);
if (raw->tmp == NULL || raw->tmpR == NULL || raw->tmpG == NULL ||
raw->tmpB == NULL) {
return NULL;
}
if ((raw->type & 0xFF00) == 0x0100) {
x = raw->sizeY * raw->sizeZ * sizeof(GLuint);
raw->rowStart = (GLuint *)malloc(x);
raw->rowSize = (GLint *)malloc(x);
if (raw->rowStart == NULL || raw->rowSize == NULL) {
return NULL;
}
raw->rleEnd = 512 + (2 * x);
fseek(raw->file, 512, SEEK_SET);
fread(raw->rowStart, 1, x, raw->file);
fread(raw->rowSize, 1, x, raw->file);
if (swapFlag) {
ConvertLong(raw->rowStart, x/sizeof(GLuint));
ConvertLong((GLuint *)raw->rowSize, x/sizeof(GLint));
}
}
return raw;
}
static void RawImageClose(rawImageRec *raw)
{
fclose(raw->file);
free(raw->tmp);
free(raw->tmpR);
free(raw->tmpG);
free(raw->tmpB);
free(raw);
}
static void RawImageGetRow(rawImageRec *raw, unsigned char *buf, int y, int z)
{
unsigned char *iPtr, *oPtr, pixel;
int count;
if ((raw->type & 0xFF00) == 0x0100) {
fseek(raw->file, raw->rowStart[y+z*raw->sizeY], SEEK_SET);
fread(raw->tmp, 1, (unsigned int)raw->rowSize[y+z*raw->sizeY],
raw->file);
iPtr = raw->tmp;
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(raw->file, 512+(y*raw->sizeX)+(z*raw->sizeX*raw->sizeY),
SEEK_SET);
fread(buf, 1, raw->sizeX, raw->file);
}
}
static void RawImageGetData(rawImageRec *raw, RGBImageRec *final)
{
unsigned char *ptr;
int i, j;
final->data = (unsigned char *)malloc((raw->sizeX+1)*(raw->sizeY+1)*4);
if (final->data == NULL) {
return;
}
ptr = final->data;
for (i = 0; i < raw->sizeY; i++) {
RawImageGetRow(raw, raw->tmpR, i, 0);
RawImageGetRow(raw, raw->tmpG, i, 1);
RawImageGetRow(raw, raw->tmpB, i, 2);
for (j = 0; j < raw->sizeX; j++) {
*ptr++ = *(raw->tmpR + j);
*ptr++ = *(raw->tmpG + j);
*ptr++ = *(raw->tmpB + j);
}
}
}
RGBImageRec *rgbImageLoad(char *fileName)
{
rawImageRec *raw;
RGBImageRec *final;
raw = RawImageOpen(fileName);
if (raw == NULL) {
return NULL;
}
final = (RGBImageRec *)malloc(sizeof(RGBImageRec));
if (final == NULL) {
RawImageClose(raw);
return NULL;
}
final->sizeX = raw->sizeX;
final->sizeY = raw->sizeY;
RawImageGetData(raw, final);
RawImageClose(raw);
return final;
}
void rgbImageFree(RGBImageRec *img)
{
if (img) {
if (img->data)
free(img->data);
free(img);
}
}
/******************************************************************************/