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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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src
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exampleCode
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opengl
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render2pixmap
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fromxwd_1.c
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1996-11-11
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/*
* fromxwd -
* Convert an xwd file to IRIS image file format.
*
* Copyright 1989 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. M.I.T. makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Paul Haeberli - 1990
*/
/*
*
* Modified by Ann LaGrone - 1994
*
* this modified version works with XImage files, not xwd files. i
* Used with the offscreen_render.c program in this example
* to convert an XImage to an sgi image format file.
*
*/
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/XWDFile.h>
#include <gl/image.h>
unsigned long MyXGetPixel();
extern char *malloc();
unsigned Image_Size();
writeimage(ximage, name )
char *name;
XImage *ximage;
{
IMAGE *image;
int y, x, index;
int xsize, ysize;
int rshift = 0, gshift = 0, bshift = 0;
unsigned long rmask, gmask, bmask;
short *rbuf, *gbuf, *bbuf;
xsize = ximage->width;
ysize = ximage->height;
rbuf = (short *)malloc(xsize*sizeof(short));
gbuf = (short *)malloc(xsize*sizeof(short));
bbuf = (short *)malloc(xsize*sizeof(short));
image = iopen(name,"w",RLE(1),3,xsize,ysize,3);
if (rmask = ximage->red_mask){
while (!(rmask & 1)) {
rmask >>= 1;
rshift++;
}
}
if (gmask = ximage->green_mask){
while (!(gmask & 1)) {
gmask >>= 1;
gshift++;
}
}
if (bmask = ximage->blue_mask){
while (!(bmask & 1)) {
bmask >>= 1;
bshift++;
}
}
for(y=0; y<ysize; y++) {
for(x=0; x<xsize; x++) {
index = MyXGetPixel(ximage,x,y);
rbuf[x] = (index>>rshift)&rmask;
gbuf[x] = (index>>gshift)&gmask;
bbuf[x] = (index>>bshift)&bmask;
}
putrow(image,rbuf,ysize-1-y,0);
putrow(image,gbuf,ysize-1-y,1);
putrow(image,bbuf,ysize-1-y,2);
}
iclose(image);
}
unsigned Image_Size(xi)
XWDFileHeader *xi;
{
if (xi->pixmap_format == ZPixmap)
return ((unsigned)xi->bytes_per_line * xi->pixmap_height);
else
return (xi->bytes_per_line * xi->pixmap_depth * xi->pixmap_height);
}
Error(string)
char *string;
{
fprintf(stderr, "xwud: Error => %s\n", string);
exit(1);
}
_swapshort (bp, n)
char *bp;
unsigned n;
{
char c;
char *ep = bp + n;
while (bp < ep) {
c = *bp;
*bp = *(bp + 1);
bp++;
*bp++ = c;
}
}
_swaplong (bp, n)
char *bp;
unsigned n;
{
char c;
char *ep = bp + n;
char *sp;
while (bp < ep) {
sp = bp + 3;
c = *sp;
*sp = *bp;
*bp++ = c;
sp = bp + 1;
c = *sp;
*sp = *bp;
*bp++ = c;
bp += 2;
}
}
/*
* XGetPixel follows
*
*/
static unsigned char const _reverse_byte[0x100] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
_Reverse_Bytes (bpt, nb)
unsigned char *bpt;
int nb;
{
do {
*bpt = _reverse_byte[*bpt];
bpt++;
} while (--nb > 0);
return;
}
static _normalizeimagebits (bpt, nb, byteorder, unitsize, bitorder)
unsigned char *bpt; /* beginning pointer to image bits */
int nb; /* number of bytes to normalize */
int byteorder; /* swap bytes if byteorder == MSBFirst */
int unitsize; /* size of the bitmap_unit or Zpixel */
int bitorder; /* swap bits if bitorder == MSBFirst */
{
if ((byteorder==MSBFirst) && (byteorder!=bitorder)) {
char c;
unsigned char *bp = bpt;
unsigned char *ep = bpt + nb;
unsigned char *sp;
switch (unitsize) {
case 4:
do { /* swap nibble */
*bp = ((*bp >> 4) & 0xF) | ((*bp << 4) & ~0xF);
bp++;
}
while (bp < ep);
break;
case 16:
do { /* swap short */
c = *bp;
*bp = *(bp + 1);
bp++;
*bp = c;
bp++;
}
while (bp < ep);
break;
case 24:
do { /* swap three */
c = *(bp + 2);
*(bp + 2) = *bp;
*bp = c;
bp += 3;
}
while (bp < ep);
break;
case 32:
do { /* swap long */
sp = bp + 3;
c = *sp;
*sp = *bp;
*bp++ = c;
sp = bp + 1;
c = *sp;
*sp = *bp;
*bp++ = c;
bp += 2;
}
while (bp < ep);
break;
}
}
if (bitorder == MSBFirst) {
_Reverse_Bytes (bpt, nb);
}
}
/*
* Macros
*
* The ROUNDUP macro rounds up a quantity to the specified boundary.
*
* The XYNORMALIZE macro determines whether XY format data requires
* normalization and calls a routine to do so if needed. The logic in
* this module is designed for LSBFirst byte and bit order, so
* normalization is done as required to present the data in this order.
*
* The ZNORMALIZE macro performs byte and nibble order normalization if
* required for Z format data.
*
* The XYINDEX macro computes the index to the starting byte (char) boundary
* for a bitmap_unit containing a pixel with coordinates x and y for image
* data in XY format.
*
* The ZINDEX macro computes the index to the starting byte (char) boundary
* for a pixel with coordinates x and y for image data in ZPixmap format.
*
*/
#define ROUNDUP(nbytes, pad) ((((nbytes) + ((pad) - 1)) / (pad)) * (pad))
#define XYNORMALIZE(bp, nbytes, img) \
if ((img->byte_order == MSBFirst) || (img->bitmap_bit_order == MSBFirst)) \
_normalizeimagebits((unsigned char *)(bp), (nbytes), img->byte_order, img->bitmap_unit, \
img->bitmap_bit_order)
#define ZNORMALIZE(bp, nbytes, img) \
if (img->byte_order == MSBFirst) \
_normalizeimagebits((unsigned char *)(bp), (nbytes), MSBFirst, img->bits_per_pixel, \
LSBFirst)
#define XYINDEX(x, y, img) \
((y) * img->bytes_per_line) + \
(((x) + img->xoffset) / img->bitmap_unit) * (img->bitmap_unit >> 3)
#define ZINDEX(x, y, img) ((y) * img->bytes_per_line) + \
(((x) * img->bits_per_pixel) >> 3)
/*
* GetPixel
*
* Returns the specified pixel. The X and Y coordinates are relative to
* the origin (upper left [0,0]) of the image. The pixel value is returned
* in normalized format, i.e. the LSB of the long is the LSB of the pixel.
* The algorithm used is:
*
* copy the source bitmap_unit or Zpixel into temp
* normalize temp if needed
* extract the pixel bits into return value
*
*/
static unsigned long const low_bits_table[] = {
0x00000000, 0x00000001, 0x00000003, 0x00000007,
0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff,
0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff,
0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff,
0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
0xffffffff
};
static unsigned long _XGetPixel (ximage, x, y)
XImage *ximage;
int x;
int y;
{
unsigned long pixel, px;
char *src;
char *dst;
int i, j;
int bits, nbytes;
long plane;
if (ximage->depth == 1) {
src = &ximage->data[XYINDEX(x, y, ximage)];
dst = (char *)&pixel;
pixel = 0;
nbytes = ximage->bitmap_unit >> 3;
for (i=0; i < nbytes; i++) *dst++ = *src++;
XYNORMALIZE(&pixel, nbytes, ximage);
bits = (x + ximage->xoffset) % ximage->bitmap_unit;
pixel = ((((char *)&pixel)[bits>>3])>>(bits&7)) & 1;
} else if (ximage->format == XYPixmap) {
pixel = 0;
plane = 0;
nbytes = ximage->bitmap_unit >> 3;
for (i=0; i < ximage->depth; i++) {
src = &ximage->data[XYINDEX(x, y, ximage)+ plane];
dst = (char *)&px;
px = 0;
for (j=0; j < nbytes; j++) *dst++ = *src++;
XYNORMALIZE(&px, nbytes, ximage);
bits = (x + ximage->xoffset) % ximage->bitmap_unit;
pixel = (pixel << 1) |
(((((char *)&px)[bits>>3])>>(bits&7)) & 1);
plane = plane + (ximage->bytes_per_line * ximage->height);
}
} else if (ximage->format == ZPixmap) {
src = &ximage->data[ZINDEX(x, y, ximage)];
dst = (char *)&px;
px = 0;
nbytes = ROUNDUP(ximage->bits_per_pixel, 8) >> 3;
for (i=0; i < nbytes; i++) *dst++ = *src++;
ZNORMALIZE(&px, nbytes, ximage);
pixel = 0;
for (i=sizeof(unsigned long); --i >= 0; )
pixel = (pixel << 8) | ((unsigned char *)&px)[i];
if (ximage->bits_per_pixel == 4) {
if (x & 1)
pixel >>= 4;
else
pixel &= 0xf;
}
} else {
fprintf(stderr, "XGetPixel: bad image!!\n");
exit(1);
}
if (ximage->bits_per_pixel == ximage->depth)
return pixel;
else
return (pixel & low_bits_table[ximage->depth]);
}
static unsigned long _XGetPixel8 (ximage, x, y)
XImage *ximage;
int x;
int y;
{
unsigned char pixel;
pixel = ((unsigned char *)ximage->data)
[y * ximage->bytes_per_line + x];
if (ximage->depth != 8)
pixel &= low_bits_table[ximage->depth];
return pixel;
}
static unsigned long _XGetPixel1 (ximage, x, y)
XImage *ximage;
int x;
int y;
{
unsigned char bit;
int xoff, yoff;
xoff = x + ximage->xoffset;
yoff = y * ximage->bytes_per_line + (xoff >> 3);
xoff &= 7;
if (ximage->bitmap_bit_order == MSBFirst)
bit = 0x80 >> xoff;
else
bit = 1 << xoff;
return (ximage->data[yoff] & bit) ? 1 : 0;
}
unsigned long MyXGetPixel (image, x, y)
XImage *image;
int x;
int y;
{
if ((image->format == ZPixmap) && (image->bits_per_pixel == 8)) {
return _XGetPixel8(image,x,y);
} else if ((image->depth == 1) &&
(image->byte_order == image->bitmap_bit_order)) {
return _XGetPixel1(image,x,y);
} else {
return _XGetPixel(image,x,y);
}
}