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- /***********************************************************
- Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
- The Netherlands.
-
- All Rights Reserved
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose and without fee is hereby granted,
- 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 names of Stichting Mathematisch
- Centrum or CWI or Corporation for National Research Initiatives or
- CNRI not be used in advertising or publicity pertaining to
- distribution of the software without specific, written prior
- permission.
-
- While CWI is the initial source for this software, a modified version
- is made available by the Corporation for National Research Initiatives
- (CNRI) at the Internet address ftp://ftp.python.org.
-
- STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
- REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
- CENTRUM OR CNRI 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.
-
- ******************************************************************/
-
- /* IMGFILE module - Interface to sgi libimage */
-
- /* XXX This modele should be done better at some point. It should return
- ** an object of image file class, and have routines to manipulate these
- ** image files in a neater way (so you can get rgb images off a greyscale
- ** file, for instance, or do a straight display without having to get the
- ** image bits into python, etc).
- **
- ** Warning: this module is very non-reentrant (esp. the readscaled stuff)
- */
-
- #include "allobjects.h"
- #include "modsupport.h"
-
- #include <gl/image.h>
- #include <errno.h>
-
- #include "/usr/people/4Dgifts/iristools/include/izoom.h"
-
- static object * ImgfileError; /* Exception we raise for various trouble */
-
- static int top_to_bottom; /* True if we want top-to-bottom images */
-
- /* The image library does not always call the error hander :-(,
- therefore we have a global variable indicating that it was called.
- It is cleared by imgfile_open(). */
-
- static int error_called;
-
-
- /* The error handler */
-
- static imgfile_error(str)
- char *str;
- {
- err_setstr(ImgfileError, str);
- error_called = 1;
- return; /* To imglib, which will return a failure indicator */
- }
-
-
- /* Open an image file and return a pointer to it.
- Make sure we raise an exception if we fail. */
-
- static IMAGE *
- imgfile_open(fname)
- char *fname;
- {
- IMAGE *image;
- i_seterror(imgfile_error);
- error_called = 0;
- errno = 0;
- if ( (image = iopen(fname, "r")) == NULL ) {
- /* Error may already be set by imgfile_error */
- if ( !error_called ) {
- if (errno)
- err_errno(ImgfileError);
- else
- err_setstr(ImgfileError, "Can't open image file");
- }
- return NULL;
- }
- return image;
- }
-
- static object *
- imgfile_ttob(self, args)
- object *self;
- object *args;
- {
- int newval;
- object *rv;
-
- if (!getargs(args, "i", &newval))
- return NULL;
- rv = newintobject(top_to_bottom);
- top_to_bottom = newval;
- return rv;
- }
-
- static object *
- imgfile_read(self, args)
- object *self;
- object *args;
- {
- char *fname;
- object *rv;
- int xsize, ysize, zsize;
- char *cdatap;
- long *idatap;
- static short rs[8192], gs[8192], bs[8192];
- int x, y;
- IMAGE *image;
- int yfirst, ylast, ystep;
-
- if ( !getargs(args, "s", &fname) )
- return NULL;
-
- if ( (image = imgfile_open(fname)) == NULL )
- return NULL;
-
- if ( image->colormap != CM_NORMAL ) {
- iclose(image);
- err_setstr(ImgfileError, "Can only handle CM_NORMAL images");
- return NULL;
- }
- if ( BPP(image->type) != 1 ) {
- iclose(image);
- err_setstr(ImgfileError, "Can't handle imgfiles with bpp!=1");
- return NULL;
- }
- xsize = image->xsize;
- ysize = image->ysize;
- zsize = image->zsize;
- if ( zsize != 1 && zsize != 3) {
- iclose(image);
- err_setstr(ImgfileError, "Can only handle 1 or 3 byte pixels");
- return NULL;
- }
- if ( xsize > 8192 ) {
- iclose(image);
- err_setstr(ImgfileError, "Can't handle image with > 8192 columns");
- return NULL;
- }
-
- if ( zsize == 3 ) zsize = 4;
- rv = newsizedstringobject((char *)NULL, xsize*ysize*zsize);
- if ( rv == NULL ) {
- iclose(image);
- return NULL;
- }
- cdatap = getstringvalue(rv);
- idatap = (long *)cdatap;
-
- if (top_to_bottom) {
- yfirst = ysize-1;
- ylast = -1;
- ystep = -1;
- } else {
- yfirst = 0;
- ylast = ysize;
- ystep = 1;
- }
- for ( y=yfirst; y != ylast && !error_called; y += ystep ) {
- if ( zsize == 1 ) {
- getrow(image, rs, y, 0);
- for(x=0; x<xsize; x++ )
- *cdatap++ = rs[x];
- } else {
- getrow(image, rs, y, 0);
- getrow(image, gs, y, 1);
- getrow(image, bs, y, 2);
- for(x=0; x<xsize; x++ )
- *idatap++ = (rs[x] & 0xff) |
- ((gs[x] & 0xff)<<8) |
- ((bs[x] & 0xff)<<16);
- }
- }
- iclose(image);
- if ( error_called ) {
- DECREF(rv);
- return NULL;
- }
- return rv;
- }
-
- static IMAGE *glob_image;
- static long *glob_datap;
- static int glob_width, glob_z, glob_ysize;
-
- static
- xs_get(buf, y)
- short *buf;
- int y;
- {
- if (top_to_bottom)
- getrow(glob_image, buf, (glob_ysize-1-y), glob_z);
- else
- getrow(glob_image, buf, y, glob_z);
- }
-
- static
- xs_put_c(buf, y)
- short *buf;
- int y;
- {
- char *datap = (char *)glob_datap + y*glob_width;
- int width = glob_width;
-
- while ( width-- )
- *datap++ = (*buf++) & 0xff;
- }
-
- static
- xs_put_0(buf, y)
- short *buf;
- int y;
- {
- long *datap = glob_datap + y*glob_width;
- int width = glob_width;
-
- while ( width-- )
- *datap++ = (*buf++) & 0xff;
- }
- static
- xs_put_12(buf, y)
- short *buf;
- int y;
- {
- long *datap = glob_datap + y*glob_width;
- int width = glob_width;
-
- while ( width-- )
- *datap++ |= ((*buf++) & 0xff) << (glob_z*8);
- }
-
- static void
- xscale(image, xsize, ysize, zsize, datap, xnew, ynew, fmode, blur)
- IMAGE *image;
- int xsize, ysize, zsize;
- long *datap;
- int xnew, ynew;
- int fmode;
- double blur;
- {
- glob_image = image;
- glob_datap = datap;
- glob_width = xnew;
- glob_ysize = ysize;
- if ( zsize == 1 ) {
- glob_z = 0;
- filterzoom(xs_get, xs_put_c, xsize, ysize, xnew, ynew, fmode, blur);
- } else {
- glob_z = 0;
- filterzoom(xs_get, xs_put_0, xsize, ysize, xnew, ynew, fmode, blur);
- glob_z = 1;
- filterzoom(xs_get, xs_put_12, xsize, ysize, xnew, ynew, fmode, blur);
- glob_z = 2;
- filterzoom(xs_get, xs_put_12, xsize, ysize, xnew, ynew, fmode, blur);
- }
- }
-
-
- static object *
- imgfile_readscaled(self, args)
- object *self;
- object *args;
- {
- char *fname;
- object *rv;
- int xsize, ysize, zsize;
- char *cdatap;
- long *idatap;
- static short rs[8192], gs[8192], bs[8192];
- int x, y;
- int xwtd, ywtd, xorig, yorig;
- float xfac, yfac;
- int cnt;
- IMAGE *image;
- char *filter;
- double blur;
- int extended;
- int fmode;
- int yfirst, ylast, ystep;
-
- /*
- ** Parse args. Funny, since arg 4 and 5 are optional
- ** (filter name and blur factor). Also, 4 or 5 arguments indicates
- ** extended scale algorithm in stead of simple-minded pixel drop/dup.
- */
- extended = 0;
- cnt = gettuplesize(args);
- if ( cnt == 5 ) {
- extended = 1;
- if ( !getargs(args, "(siisd)", &fname, &xwtd, &ywtd, &filter, &blur) )
- return NULL;
- } else if ( cnt == 4 ) {
- extended = 1;
- if ( !getargs(args, "(siis)", &fname, &xwtd, &ywtd, &filter) )
- return NULL;
- blur = 1.0;
- } else if ( !getargs(args, "(sii)", &fname, &xwtd, &ywtd) )
- return NULL;
-
- /*
- ** Check parameters, open file and check type, rows, etc.
- */
- if ( extended ) {
- if ( strcmp(filter, "impulse") == 0 ) fmode = IMPULSE;
- else if ( strcmp( filter, "box") == 0 ) fmode = BOX;
- else if ( strcmp( filter, "triangle") == 0 ) fmode = TRIANGLE;
- else if ( strcmp( filter, "quadratic") == 0 ) fmode = QUADRATIC;
- else if ( strcmp( filter, "gaussian") == 0 ) fmode = GAUSSIAN;
- else {
- err_setstr(ImgfileError, "Unknown filter type");
- return NULL;
- }
- }
-
- if ( (image = imgfile_open(fname)) == NULL )
- return NULL;
-
- if ( image->colormap != CM_NORMAL ) {
- iclose(image);
- err_setstr(ImgfileError, "Can only handle CM_NORMAL images");
- return NULL;
- }
- if ( BPP(image->type) != 1 ) {
- iclose(image);
- err_setstr(ImgfileError, "Can't handle imgfiles with bpp!=1");
- return NULL;
- }
- xsize = image->xsize;
- ysize = image->ysize;
- zsize = image->zsize;
- if ( zsize != 1 && zsize != 3) {
- iclose(image);
- err_setstr(ImgfileError, "Can only handle 1 or 3 byte pixels");
- return NULL;
- }
- if ( xsize > 8192 ) {
- iclose(image);
- err_setstr(ImgfileError, "Can't handle image with > 8192 columns");
- return NULL;
- }
-
- if ( zsize == 3 ) zsize = 4;
- rv = newsizedstringobject(NULL, xwtd*ywtd*zsize);
- if ( rv == NULL ) {
- iclose(image);
- return NULL;
- }
- xfac = (float)xsize/(float)xwtd;
- yfac = (float)ysize/(float)ywtd;
- cdatap = getstringvalue(rv);
- idatap = (long *)cdatap;
-
- if ( extended ) {
- xscale(image, xsize, ysize, zsize, idatap, xwtd, ywtd, fmode, blur);
- } else {
- if (top_to_bottom) {
- yfirst = ywtd-1;
- ylast = -1;
- ystep = -1;
- } else {
- yfirst = 0;
- ylast = ywtd;
- ystep = 1;
- }
- for ( y=yfirst; y != ylast && !error_called; y += ystep ) {
- yorig = (int)(y*yfac);
- if ( zsize == 1 ) {
- getrow(image, rs, yorig, 0);
- for(x=0; x<xwtd; x++ ) {
- *cdatap++ = rs[(int)(x*xfac)];
- }
- } else {
- getrow(image, rs, yorig, 0);
- getrow(image, gs, yorig, 1);
- getrow(image, bs, yorig, 2);
- for(x=0; x<xwtd; x++ ) {
- xorig = (int)(x*xfac);
- *idatap++ = (rs[xorig] & 0xff) |
- ((gs[xorig] & 0xff)<<8) |
- ((bs[xorig] & 0xff)<<16);
- }
- }
- }
- }
- iclose(image);
- if ( error_called ) {
- DECREF(rv);
- return NULL;
- }
- return rv;
- }
-
- static object *
- imgfile_getsizes(self, args)
- object *self;
- object *args;
- {
- char *fname;
- object *rv;
- IMAGE *image;
-
- if ( !getargs(args, "s", &fname) )
- return NULL;
-
- if ( (image = imgfile_open(fname)) == NULL )
- return NULL;
- rv = mkvalue("(iii)", image->xsize, image->ysize, image->zsize);
- iclose(image);
- return rv;
- }
-
- static object *
- imgfile_write(self, args)
- object *self;
- object *args;
- {
- IMAGE *image;
- char *fname;
- int xsize, ysize, zsize, len;
- char *cdatap;
- long *idatap;
- short rs[8192], gs[8192], bs[8192];
- short r, g, b;
- long rgb;
- int x, y;
- int yfirst, ylast, ystep;
-
-
- if ( !getargs(args, "(ss#iii)",
- &fname, &cdatap, &len, &xsize, &ysize, &zsize) )
- return NULL;
-
- if ( zsize != 1 && zsize != 3 ) {
- err_setstr(ImgfileError, "Can only handle 1 or 3 byte pixels");
- return NULL;
- }
- if ( len != xsize * ysize * (zsize == 1 ? 1 : 4) ) {
- err_setstr(ImgfileError, "Data does not match sizes");
- return NULL;
- }
- if ( xsize > 8192 ) {
- err_setstr(ImgfileError, "Can't handle image with > 8192 columns");
- return NULL;
- }
-
- error_called = 0;
- errno = 0;
- image =iopen(fname, "w", RLE(1), 3, xsize, ysize, zsize);
- if ( image == 0 ) {
- if ( ! error_called ) {
- if (errno)
- err_errno(ImgfileError);
- else
- err_setstr(ImgfileError, "Can't create image file");
- }
- return NULL;
- }
-
- idatap = (long *)cdatap;
-
- if (top_to_bottom) {
- yfirst = ysize-1;
- ylast = -1;
- ystep = -1;
- } else {
- yfirst = 0;
- ylast = ysize;
- ystep = 1;
- }
- for ( y=yfirst; y != ylast && !error_called; y += ystep ) {
- if ( zsize == 1 ) {
- for( x=0; x<xsize; x++ )
- rs[x] = *cdatap++;
- putrow(image, rs, y, 0);
- } else {
- for( x=0; x<xsize; x++ ) {
- rgb = *idatap++;
- r = rgb & 0xff;
- g = (rgb >> 8 ) & 0xff;
- b = (rgb >> 16 ) & 0xff;
- rs[x] = r;
- gs[x] = g;
- bs[x] = b;
- }
- putrow(image, rs, y, 0);
- putrow(image, gs, y, 1);
- putrow(image, bs, y, 2);
- }
- }
- iclose(image);
- if ( error_called )
- return NULL;
- INCREF(None);
- return None;
-
- }
-
-
- static struct methodlist imgfile_methods[] = {
- { "getsizes", imgfile_getsizes },
- { "read", imgfile_read },
- { "readscaled", imgfile_readscaled, 1},
- { "write", imgfile_write },
- { "ttob", imgfile_ttob },
- { NULL, NULL } /* Sentinel */
- };
-
-
- void
- initimgfile()
- {
- object *m, *d;
- m = initmodule("imgfile", imgfile_methods);
- d = getmoduledict(m);
- ImgfileError = newstringobject("imgfile.error");
- if ( ImgfileError == NULL || dictinsert(d, "error", ImgfileError) )
- fatal("can't define imgfile.error");
- }
-