mirror of
https://github.com/python/cpython.git
synced 2024-11-23 18:04:37 +08:00
503 lines
11 KiB
C
503 lines
11 KiB
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);
|
|
d = PyModule_GetDict(m);
|
|
ImgfileError = PyErr_NewException("imgfile.error", NULL, NULL);
|
|
if (ImgfileError != NULL)
|
|
PyDict_SetItemString(d, "error", ImgfileError);
|
|
}
|
|
|
|
|
|
|