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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);
- }
- }
-