ref: 5c1feb0ef0b795e5de71e956f9ccddcd5c4b7f21
dir: /sys/src/cmd/python/Modules/imgfile.c/
/* IMGFILE module - Interface to sgi libimage */
/* XXX This module 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 "Python.h"
#include <gl/image.h>
#include "/usr/people/4Dgifts/iristools/include/izoom.h"
/* Bunch of missing extern decls; keep gcc -Wall happy... */
extern void i_seterror();
extern void iclose();
extern void filterzoom();
extern void putrow();
extern void getrow();
static PyObject * 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 void
imgfile_error(char *str)
{
PyErr_SetString(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(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)
PyErr_SetFromErrno(ImgfileError);
else
PyErr_SetString(ImgfileError,
"Can't open image file");
}
return NULL;
}
return image;
}
static PyObject *
imgfile_ttob(PyObject *self, PyObject *args)
{
int newval;
PyObject *rv;
if (!PyArg_ParseTuple(args, "i:ttob", &newval))
return NULL;
rv = PyInt_FromLong(top_to_bottom);
top_to_bottom = newval;
return rv;
}
static PyObject *
imgfile_read(PyObject *self, PyObject *args)
{
char *fname;
PyObject *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 ( !PyArg_ParseTuple(args, "s:read", &fname) )
return NULL;
if ( (image = imgfile_open(fname)) == NULL )
return NULL;
if ( image->colormap != CM_NORMAL ) {
iclose(image);
PyErr_SetString(ImgfileError,
"Can only handle CM_NORMAL images");
return NULL;
}
if ( BPP(image->type) != 1 ) {
iclose(image);
PyErr_SetString(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);
PyErr_SetString(ImgfileError,
"Can only handle 1 or 3 byte pixels");
return NULL;
}
if ( xsize > 8192 ) {
iclose(image);
PyErr_SetString(ImgfileError,
"Can't handle image with > 8192 columns");
return NULL;
}
if ( zsize == 3 ) zsize = 4;
rv = PyString_FromStringAndSize((char *)NULL, xsize*ysize*zsize);
if ( rv == NULL ) {
iclose(image);
return NULL;
}
cdatap = PyString_AsString(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 ) {
Py_DECREF(rv);
return NULL;
}
return rv;
}
static IMAGE *glob_image;
static long *glob_datap;
static int glob_width, glob_z, glob_ysize;
static void
xs_get(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 void
xs_put_c(short *buf, int y)
{
char *datap = (char *)glob_datap + y*glob_width;
int width = glob_width;
while ( width-- )
*datap++ = (*buf++) & 0xff;
}
static void
xs_put_0(short *buf, int y)
{
long *datap = glob_datap + y*glob_width;
int width = glob_width;
while ( width-- )
*datap++ = (*buf++) & 0xff;
}
static void
xs_put_12(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 *image, int xsize, int ysize, int zsize,
long *datap, int xnew, int 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 PyObject *
imgfile_readscaled(PyObject *self, PyObject *args)
{
char *fname;
PyObject *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;
IMAGE *image;
char *filter;
double blur = 1.0;
int extended;
int fmode = 0;
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 = PyTuple_Size(args) >= 4;
if ( !PyArg_ParseTuple(args, "sii|sd",
&fname, &xwtd, &ywtd, &filter, &blur) )
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 {
PyErr_SetString(ImgfileError, "Unknown filter type");
return NULL;
}
}
if ( (image = imgfile_open(fname)) == NULL )
return NULL;
if ( image->colormap != CM_NORMAL ) {
iclose(image);
PyErr_SetString(ImgfileError,
"Can only handle CM_NORMAL images");
return NULL;
}
if ( BPP(image->type) != 1 ) {
iclose(image);
PyErr_SetString(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);
PyErr_SetString(ImgfileError,
"Can only handle 1 or 3 byte pixels");
return NULL;
}
if ( xsize > 8192 ) {
iclose(image);
PyErr_SetString(ImgfileError,
"Can't handle image with > 8192 columns");
return NULL;
}
if ( zsize == 3 ) zsize = 4;
rv = PyString_FromStringAndSize(NULL, xwtd*ywtd*zsize);
if ( rv == NULL ) {
iclose(image);
return NULL;
}
PyFPE_START_PROTECT("readscaled", return 0)
xfac = (float)xsize/(float)xwtd;
yfac = (float)ysize/(float)ywtd;
PyFPE_END_PROTECT(yfac)
cdatap = PyString_AsString(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 ) {
Py_DECREF(rv);
return NULL;
}
return rv;
}
static PyObject *
imgfile_getsizes(PyObject *self, PyObject *args)
{
char *fname;
PyObject *rv;
IMAGE *image;
if ( !PyArg_ParseTuple(args, "s:getsizes", &fname) )
return NULL;
if ( (image = imgfile_open(fname)) == NULL )
return NULL;
rv = Py_BuildValue("(iii)", image->xsize, image->ysize, image->zsize);
iclose(image);
return rv;
}
static PyObject *
imgfile_write(PyObject *self, PyObject *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 ( !PyArg_ParseTuple(args, "ss#iii:write",
&fname, &cdatap, &len, &xsize, &ysize, &zsize) )
return NULL;
if ( zsize != 1 && zsize != 3 ) {
PyErr_SetString(ImgfileError,
"Can only handle 1 or 3 byte pixels");
return NULL;
}
if ( len != xsize * ysize * (zsize == 1 ? 1 : 4) ) {
PyErr_SetString(ImgfileError, "Data does not match sizes");
return NULL;
}
if ( xsize > 8192 ) {
PyErr_SetString(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)
PyErr_SetFromErrno(ImgfileError);
else
PyErr_SetString(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;
Py_INCREF(Py_None);
return Py_None;
}
static PyMethodDef imgfile_methods[] = {
{ "getsizes", imgfile_getsizes, METH_VARARGS },
{ "read", imgfile_read, METH_VARARGS },
{ "readscaled", imgfile_readscaled, METH_VARARGS},
{ "write", imgfile_write, METH_VARARGS },
{ "ttob", imgfile_ttob, METH_VARARGS },
{ NULL, NULL } /* Sentinel */
};
void
initimgfile(void)
{
PyObject *m, *d;
m = Py_InitModule("imgfile", imgfile_methods);
if (m == NULL)
return;
d = PyModule_GetDict(m);
ImgfileError = PyErr_NewException("imgfile.error", NULL, NULL);
if (ImgfileError != NULL)
PyDict_SetItemString(d, "error", ImgfileError);
}