505 lines
11 KiB
C
505 lines
11 KiB
C
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/* IMGFILE module - Interface to sgi libimage */
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/* XXX This module should be done better at some point. It should return
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** an object of image file class, and have routines to manipulate these
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** image files in a neater way (so you can get rgb images off a greyscale
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** file, for instance, or do a straight display without having to get the
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** image bits into python, etc).
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**
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** Warning: this module is very non-reentrant (esp. the readscaled stuff)
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*/
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#include "Python.h"
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#include <gl/image.h>
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#include "/usr/people/4Dgifts/iristools/include/izoom.h"
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/* Bunch of missing extern decls; keep gcc -Wall happy... */
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extern void i_seterror();
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extern void iclose();
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extern void filterzoom();
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extern void putrow();
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extern void getrow();
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static PyObject * ImgfileError; /* Exception we raise for various trouble */
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static int top_to_bottom; /* True if we want top-to-bottom images */
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/* The image library does not always call the error hander :-(,
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therefore we have a global variable indicating that it was called.
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It is cleared by imgfile_open(). */
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static int error_called;
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/* The error handler */
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static void
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imgfile_error(char *str)
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{
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PyErr_SetString(ImgfileError, str);
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error_called = 1;
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return; /* To imglib, which will return a failure indicator */
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}
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/* Open an image file and return a pointer to it.
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Make sure we raise an exception if we fail. */
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static IMAGE *
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imgfile_open(char *fname)
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{
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IMAGE *image;
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i_seterror(imgfile_error);
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error_called = 0;
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errno = 0;
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if ( (image = iopen(fname, "r")) == NULL ) {
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/* Error may already be set by imgfile_error */
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if ( !error_called ) {
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if (errno)
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PyErr_SetFromErrno(ImgfileError);
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else
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PyErr_SetString(ImgfileError,
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"Can't open image file");
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}
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return NULL;
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}
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return image;
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}
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static PyObject *
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imgfile_ttob(PyObject *self, PyObject *args)
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{
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int newval;
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PyObject *rv;
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if (!PyArg_ParseTuple(args, "i:ttob", &newval))
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return NULL;
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rv = PyInt_FromLong(top_to_bottom);
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top_to_bottom = newval;
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return rv;
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}
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static PyObject *
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imgfile_read(PyObject *self, PyObject *args)
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{
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char *fname;
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PyObject *rv;
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int xsize, ysize, zsize;
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char *cdatap;
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long *idatap;
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static short rs[8192], gs[8192], bs[8192];
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int x, y;
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IMAGE *image;
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int yfirst, ylast, ystep;
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if ( !PyArg_ParseTuple(args, "s:read", &fname) )
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return NULL;
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if ( (image = imgfile_open(fname)) == NULL )
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return NULL;
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if ( image->colormap != CM_NORMAL ) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can only handle CM_NORMAL images");
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return NULL;
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}
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if ( BPP(image->type) != 1 ) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can't handle imgfiles with bpp!=1");
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return NULL;
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}
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xsize = image->xsize;
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ysize = image->ysize;
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zsize = image->zsize;
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if ( zsize != 1 && zsize != 3) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can only handle 1 or 3 byte pixels");
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return NULL;
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}
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if ( xsize > 8192 ) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can't handle image with > 8192 columns");
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return NULL;
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}
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if ( zsize == 3 ) zsize = 4;
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rv = PyString_FromStringAndSize((char *)NULL, xsize*ysize*zsize);
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if ( rv == NULL ) {
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iclose(image);
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return NULL;
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}
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cdatap = PyString_AsString(rv);
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idatap = (long *)cdatap;
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if (top_to_bottom) {
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yfirst = ysize-1;
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ylast = -1;
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ystep = -1;
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} else {
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yfirst = 0;
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ylast = ysize;
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ystep = 1;
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}
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for ( y=yfirst; y != ylast && !error_called; y += ystep ) {
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if ( zsize == 1 ) {
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getrow(image, rs, y, 0);
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for(x=0; x<xsize; x++ )
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*cdatap++ = rs[x];
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} else {
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getrow(image, rs, y, 0);
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getrow(image, gs, y, 1);
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getrow(image, bs, y, 2);
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for(x=0; x<xsize; x++ )
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*idatap++ = (rs[x] & 0xff) |
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((gs[x] & 0xff)<<8) |
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((bs[x] & 0xff)<<16);
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}
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}
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iclose(image);
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if ( error_called ) {
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Py_DECREF(rv);
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return NULL;
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}
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return rv;
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}
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static IMAGE *glob_image;
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static long *glob_datap;
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static int glob_width, glob_z, glob_ysize;
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static void
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xs_get(short *buf, int y)
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{
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if (top_to_bottom)
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getrow(glob_image, buf, (glob_ysize-1-y), glob_z);
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else
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getrow(glob_image, buf, y, glob_z);
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}
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static void
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xs_put_c(short *buf, int y)
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{
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char *datap = (char *)glob_datap + y*glob_width;
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int width = glob_width;
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while ( width-- )
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*datap++ = (*buf++) & 0xff;
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}
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static void
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xs_put_0(short *buf, int y)
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{
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long *datap = glob_datap + y*glob_width;
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int width = glob_width;
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while ( width-- )
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*datap++ = (*buf++) & 0xff;
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}
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static void
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xs_put_12(short *buf, int y)
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{
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long *datap = glob_datap + y*glob_width;
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int width = glob_width;
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while ( width-- )
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*datap++ |= ((*buf++) & 0xff) << (glob_z*8);
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}
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static void
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xscale(IMAGE *image, int xsize, int ysize, int zsize,
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long *datap, int xnew, int ynew, int fmode, double blur)
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{
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glob_image = image;
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glob_datap = datap;
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glob_width = xnew;
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glob_ysize = ysize;
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if ( zsize == 1 ) {
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glob_z = 0;
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filterzoom(xs_get, xs_put_c, xsize, ysize,
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xnew, ynew, fmode, blur);
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} else {
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glob_z = 0;
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filterzoom(xs_get, xs_put_0, xsize, ysize,
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xnew, ynew, fmode, blur);
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glob_z = 1;
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filterzoom(xs_get, xs_put_12, xsize, ysize,
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xnew, ynew, fmode, blur);
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glob_z = 2;
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filterzoom(xs_get, xs_put_12, xsize, ysize,
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xnew, ynew, fmode, blur);
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}
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}
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static PyObject *
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imgfile_readscaled(PyObject *self, PyObject *args)
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{
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char *fname;
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PyObject *rv;
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int xsize, ysize, zsize;
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char *cdatap;
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long *idatap;
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static short rs[8192], gs[8192], bs[8192];
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int x, y;
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int xwtd, ywtd, xorig, yorig;
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float xfac, yfac;
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IMAGE *image;
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char *filter;
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double blur = 1.0;
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int extended;
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int fmode = 0;
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int yfirst, ylast, ystep;
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/*
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** Parse args. Funny, since arg 4 and 5 are optional
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** (filter name and blur factor). Also, 4 or 5 arguments indicates
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** extended scale algorithm in stead of simple-minded pixel drop/dup.
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*/
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extended = PyTuple_Size(args) >= 4;
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if ( !PyArg_ParseTuple(args, "sii|sd",
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&fname, &xwtd, &ywtd, &filter, &blur) )
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return NULL;
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/*
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** Check parameters, open file and check type, rows, etc.
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*/
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if ( extended ) {
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if ( strcmp(filter, "impulse") == 0 )
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fmode = IMPULSE;
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else if ( strcmp( filter, "box") == 0 )
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fmode = BOX;
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else if ( strcmp( filter, "triangle") == 0 )
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fmode = TRIANGLE;
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else if ( strcmp( filter, "quadratic") == 0 )
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fmode = QUADRATIC;
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else if ( strcmp( filter, "gaussian") == 0 )
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fmode = GAUSSIAN;
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else {
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PyErr_SetString(ImgfileError, "Unknown filter type");
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return NULL;
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}
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}
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if ( (image = imgfile_open(fname)) == NULL )
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return NULL;
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if ( image->colormap != CM_NORMAL ) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can only handle CM_NORMAL images");
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return NULL;
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}
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if ( BPP(image->type) != 1 ) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can't handle imgfiles with bpp!=1");
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return NULL;
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}
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xsize = image->xsize;
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ysize = image->ysize;
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zsize = image->zsize;
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if ( zsize != 1 && zsize != 3) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can only handle 1 or 3 byte pixels");
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return NULL;
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}
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if ( xsize > 8192 ) {
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iclose(image);
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PyErr_SetString(ImgfileError,
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"Can't handle image with > 8192 columns");
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return NULL;
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}
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if ( zsize == 3 ) zsize = 4;
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rv = PyString_FromStringAndSize(NULL, xwtd*ywtd*zsize);
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if ( rv == NULL ) {
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iclose(image);
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return NULL;
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}
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PyFPE_START_PROTECT("readscaled", return 0)
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xfac = (float)xsize/(float)xwtd;
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yfac = (float)ysize/(float)ywtd;
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PyFPE_END_PROTECT(yfac)
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cdatap = PyString_AsString(rv);
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idatap = (long *)cdatap;
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if ( extended ) {
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xscale(image, xsize, ysize, zsize,
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idatap, xwtd, ywtd, fmode, blur);
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} else {
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if (top_to_bottom) {
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yfirst = ywtd-1;
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ylast = -1;
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ystep = -1;
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} else {
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yfirst = 0;
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ylast = ywtd;
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ystep = 1;
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}
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for ( y=yfirst; y != ylast && !error_called; y += ystep ) {
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yorig = (int)(y*yfac);
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if ( zsize == 1 ) {
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getrow(image, rs, yorig, 0);
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for(x=0; x<xwtd; x++ ) {
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*cdatap++ = rs[(int)(x*xfac)];
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}
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} else {
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getrow(image, rs, yorig, 0);
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getrow(image, gs, yorig, 1);
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getrow(image, bs, yorig, 2);
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for(x=0; x<xwtd; x++ ) {
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xorig = (int)(x*xfac);
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*idatap++ = (rs[xorig] & 0xff) |
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((gs[xorig] & 0xff)<<8) |
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((bs[xorig] & 0xff)<<16);
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}
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}
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}
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}
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iclose(image);
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if ( error_called ) {
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Py_DECREF(rv);
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return NULL;
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}
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return rv;
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}
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static PyObject *
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imgfile_getsizes(PyObject *self, PyObject *args)
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{
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char *fname;
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PyObject *rv;
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IMAGE *image;
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if ( !PyArg_ParseTuple(args, "s:getsizes", &fname) )
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return NULL;
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if ( (image = imgfile_open(fname)) == NULL )
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return NULL;
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rv = Py_BuildValue("(iii)", image->xsize, image->ysize, image->zsize);
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iclose(image);
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return rv;
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}
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static PyObject *
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imgfile_write(PyObject *self, PyObject *args)
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{
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IMAGE *image;
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char *fname;
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int xsize, ysize, zsize, len;
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char *cdatap;
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long *idatap;
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short rs[8192], gs[8192], bs[8192];
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short r, g, b;
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long rgb;
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int x, y;
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int yfirst, ylast, ystep;
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if ( !PyArg_ParseTuple(args, "ss#iii:write",
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&fname, &cdatap, &len, &xsize, &ysize, &zsize) )
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return NULL;
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if ( zsize != 1 && zsize != 3 ) {
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PyErr_SetString(ImgfileError,
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"Can only handle 1 or 3 byte pixels");
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return NULL;
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}
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if ( len != xsize * ysize * (zsize == 1 ? 1 : 4) ) {
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PyErr_SetString(ImgfileError, "Data does not match sizes");
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return NULL;
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}
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if ( xsize > 8192 ) {
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PyErr_SetString(ImgfileError,
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"Can't handle image with > 8192 columns");
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return NULL;
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}
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error_called = 0;
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errno = 0;
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image =iopen(fname, "w", RLE(1), 3, xsize, ysize, zsize);
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if ( image == 0 ) {
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if ( ! error_called ) {
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if (errno)
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PyErr_SetFromErrno(ImgfileError);
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else
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PyErr_SetString(ImgfileError,
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"Can't create image file");
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}
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return NULL;
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}
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idatap = (long *)cdatap;
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if (top_to_bottom) {
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yfirst = ysize-1;
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ylast = -1;
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ystep = -1;
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} else {
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yfirst = 0;
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ylast = ysize;
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ystep = 1;
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}
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for ( y=yfirst; y != ylast && !error_called; y += ystep ) {
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if ( zsize == 1 ) {
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for( x=0; x<xsize; x++ )
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rs[x] = *cdatap++;
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putrow(image, rs, y, 0);
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} else {
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for( x=0; x<xsize; x++ ) {
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rgb = *idatap++;
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r = rgb & 0xff;
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g = (rgb >> 8 ) & 0xff;
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b = (rgb >> 16 ) & 0xff;
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rs[x] = r;
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gs[x] = g;
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bs[x] = b;
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}
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putrow(image, rs, y, 0);
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putrow(image, gs, y, 1);
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putrow(image, bs, y, 2);
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}
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}
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iclose(image);
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if ( error_called )
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return NULL;
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyMethodDef imgfile_methods[] = {
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{ "getsizes", imgfile_getsizes, METH_VARARGS },
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{ "read", imgfile_read, METH_VARARGS },
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{ "readscaled", imgfile_readscaled, METH_VARARGS},
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{ "write", imgfile_write, METH_VARARGS },
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{ "ttob", imgfile_ttob, METH_VARARGS },
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{ NULL, NULL } /* Sentinel */
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};
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void
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initimgfile(void)
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{
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PyObject *m, *d;
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m = Py_InitModule("imgfile", imgfile_methods);
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if (m == NULL)
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return;
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d = PyModule_GetDict(m);
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ImgfileError = PyErr_NewException("imgfile.error", NULL, NULL);
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if (ImgfileError != NULL)
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PyDict_SetItemString(d, "error", ImgfileError);
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}
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