784 lines
17 KiB
C
784 lines
17 KiB
C
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/* imageopmodule - Various operations on pictures */
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#ifdef sun
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#define signed
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#endif
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#include "Python.h"
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#if SIZEOF_INT == 4
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typedef int Py_Int32;
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typedef unsigned int Py_UInt32;
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#else
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#if SIZEOF_LONG == 4
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typedef long Py_Int32;
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typedef unsigned long Py_UInt32;
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#else
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#error "No 4-byte integral type"
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#endif
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#endif
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#define CHARP(cp, xmax, x, y) ((char *)(cp+y*xmax+x))
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#define SHORTP(cp, xmax, x, y) ((short *)(cp+2*(y*xmax+x)))
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#define LONGP(cp, xmax, x, y) ((Py_Int32 *)(cp+4*(y*xmax+x)))
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static PyObject *ImageopError;
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static PyObject *ImageopDict;
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/* If this function returns true (the default if anything goes wrong), we're
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behaving in a backward-compatible way with respect to how multi-byte pixels
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are stored in the strings. The code in this module was originally written
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for an SGI which is a big-endian system, and so the old code assumed that
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4-byte integers hold the R, G, and B values in a particular order.
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However, on little-endian systems the order is reversed, and so not
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actually compatible with what gl.lrectwrite and imgfile expect.
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(gl.lrectwrite and imgfile are also SGI-specific, however, it is
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conceivable that the data handled here comes from or goes to an SGI or that
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it is otherwise used in the expectation that the byte order in the strings
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is as specified.)
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The function returns the value of the module variable
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"backward_compatible", or 1 if the variable does not exist or is not an
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int.
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*/
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static int
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imageop_backward_compatible(void)
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{
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static PyObject *bcos;
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PyObject *bco;
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long rc;
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if (ImageopDict == NULL) /* "cannot happen" */
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return 1;
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if (bcos == NULL) {
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/* cache string object for future use */
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bcos = PyString_FromString("backward_compatible");
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if (bcos == NULL)
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return 1;
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}
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bco = PyDict_GetItem(ImageopDict, bcos);
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if (bco == NULL)
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return 1;
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if (!PyInt_Check(bco))
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return 1;
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rc = PyInt_AsLong(bco);
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if (PyErr_Occurred()) {
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/* not an integer, or too large, or something */
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PyErr_Clear();
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rc = 1;
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}
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return rc != 0; /* convert to values 0, 1 */
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}
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static PyObject *
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imageop_crop(PyObject *self, PyObject *args)
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{
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char *cp, *ncp;
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short *nsp;
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Py_Int32 *nlp;
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int len, size, x, y, newx1, newx2, newy1, newy2;
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int ix, iy, xstep, ystep;
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PyObject *rv;
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if ( !PyArg_ParseTuple(args, "s#iiiiiii", &cp, &len, &size, &x, &y,
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&newx1, &newy1, &newx2, &newy2) )
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return 0;
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if ( size != 1 && size != 2 && size != 4 ) {
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PyErr_SetString(ImageopError, "Size should be 1, 2 or 4");
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return 0;
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}
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if ( len != size*x*y ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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xstep = (newx1 < newx2)? 1 : -1;
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ystep = (newy1 < newy2)? 1 : -1;
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rv = PyString_FromStringAndSize(NULL,
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(abs(newx2-newx1)+1)*(abs(newy2-newy1)+1)*size);
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if ( rv == 0 )
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return 0;
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ncp = (char *)PyString_AsString(rv);
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nsp = (short *)ncp;
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nlp = (Py_Int32 *)ncp;
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newy2 += ystep;
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newx2 += xstep;
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for( iy = newy1; iy != newy2; iy+=ystep ) {
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for ( ix = newx1; ix != newx2; ix+=xstep ) {
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if ( iy < 0 || iy >= y || ix < 0 || ix >= x ) {
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if ( size == 1 )
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*ncp++ = 0;
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else
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*nlp++ = 0;
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} else {
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if ( size == 1 )
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*ncp++ = *CHARP(cp, x, ix, iy);
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else if ( size == 2 )
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*nsp++ = *SHORTP(cp, x, ix, iy);
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else
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*nlp++ = *LONGP(cp, x, ix, iy);
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}
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}
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}
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return rv;
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}
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static PyObject *
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imageop_scale(PyObject *self, PyObject *args)
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{
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char *cp, *ncp;
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short *nsp;
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Py_Int32 *nlp;
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int len, size, x, y, newx, newy;
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int ix, iy;
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int oix, oiy;
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PyObject *rv;
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if ( !PyArg_ParseTuple(args, "s#iiiii",
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&cp, &len, &size, &x, &y, &newx, &newy) )
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return 0;
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if ( size != 1 && size != 2 && size != 4 ) {
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PyErr_SetString(ImageopError, "Size should be 1, 2 or 4");
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return 0;
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}
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if ( len != size*x*y ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, newx*newy*size);
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if ( rv == 0 )
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return 0;
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ncp = (char *)PyString_AsString(rv);
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nsp = (short *)ncp;
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nlp = (Py_Int32 *)ncp;
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for( iy = 0; iy < newy; iy++ ) {
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for ( ix = 0; ix < newx; ix++ ) {
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oix = ix * x / newx;
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oiy = iy * y / newy;
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if ( size == 1 )
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*ncp++ = *CHARP(cp, x, oix, oiy);
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else if ( size == 2 )
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*nsp++ = *SHORTP(cp, x, oix, oiy);
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else
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*nlp++ = *LONGP(cp, x, oix, oiy);
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}
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}
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return rv;
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}
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/* Note: this routine can use a bit of optimizing */
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static PyObject *
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imageop_tovideo(PyObject *self, PyObject *args)
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{
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int maxx, maxy, x, y, len;
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int i;
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unsigned char *cp, *ncp;
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int width;
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PyObject *rv;
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if ( !PyArg_ParseTuple(args, "s#iii", &cp, &len, &width, &maxx, &maxy) )
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return 0;
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if ( width != 1 && width != 4 ) {
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PyErr_SetString(ImageopError, "Size should be 1 or 4");
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return 0;
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}
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if ( maxx*maxy*width != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, len);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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if ( width == 1 ) {
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memcpy(ncp, cp, maxx); /* Copy first line */
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ncp += maxx;
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for (y=1; y<maxy; y++) { /* Interpolate other lines */
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for(x=0; x<maxx; x++) {
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i = y*maxx + x;
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*ncp++ = ((int)cp[i] + (int)cp[i-maxx]) >> 1;
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}
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}
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} else {
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memcpy(ncp, cp, maxx*4); /* Copy first line */
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ncp += maxx*4;
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for (y=1; y<maxy; y++) { /* Interpolate other lines */
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for(x=0; x<maxx; x++) {
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i = (y*maxx + x)*4 + 1;
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*ncp++ = 0; /* Skip alfa comp */
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*ncp++ = ((int)cp[i] + (int)cp[i-4*maxx]) >> 1;
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i++;
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*ncp++ = ((int)cp[i] + (int)cp[i-4*maxx]) >> 1;
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i++;
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*ncp++ = ((int)cp[i] + (int)cp[i-4*maxx]) >> 1;
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}
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}
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}
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return rv;
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}
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static PyObject *
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imageop_grey2mono(PyObject *self, PyObject *args)
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{
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int tres, x, y, len;
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unsigned char *cp, *ncp;
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unsigned char ovalue;
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PyObject *rv;
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int i, bit;
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if ( !PyArg_ParseTuple(args, "s#iii", &cp, &len, &x, &y, &tres) )
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return 0;
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if ( x*y != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, (len+7)/8);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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bit = 0x80;
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ovalue = 0;
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for ( i=0; i < len; i++ ) {
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if ( (int)cp[i] > tres )
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ovalue |= bit;
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bit >>= 1;
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if ( bit == 0 ) {
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*ncp++ = ovalue;
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bit = 0x80;
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ovalue = 0;
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}
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}
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if ( bit != 0x80 )
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*ncp++ = ovalue;
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return rv;
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}
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static PyObject *
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imageop_grey2grey4(PyObject *self, PyObject *args)
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{
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int x, y, len;
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unsigned char *cp, *ncp;
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unsigned char ovalue;
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PyObject *rv;
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int i;
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int pos;
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if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
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return 0;
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if ( x*y != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, (len+1)/2);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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pos = 0;
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ovalue = 0;
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for ( i=0; i < len; i++ ) {
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ovalue |= ((int)cp[i] & 0xf0) >> pos;
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pos += 4;
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if ( pos == 8 ) {
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*ncp++ = ovalue;
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ovalue = 0;
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pos = 0;
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}
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}
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if ( pos != 0 )
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*ncp++ = ovalue;
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return rv;
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}
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static PyObject *
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imageop_grey2grey2(PyObject *self, PyObject *args)
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{
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int x, y, len;
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unsigned char *cp, *ncp;
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unsigned char ovalue;
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PyObject *rv;
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int i;
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int pos;
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if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
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return 0;
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if ( x*y != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, (len+3)/4);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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pos = 0;
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ovalue = 0;
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for ( i=0; i < len; i++ ) {
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ovalue |= ((int)cp[i] & 0xc0) >> pos;
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pos += 2;
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if ( pos == 8 ) {
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*ncp++ = ovalue;
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ovalue = 0;
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pos = 0;
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}
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}
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if ( pos != 0 )
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*ncp++ = ovalue;
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return rv;
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}
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static PyObject *
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imageop_dither2mono(PyObject *self, PyObject *args)
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{
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int sum, x, y, len;
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unsigned char *cp, *ncp;
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unsigned char ovalue;
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PyObject *rv;
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int i, bit;
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if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
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return 0;
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if ( x*y != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, (len+7)/8);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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bit = 0x80;
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ovalue = 0;
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sum = 0;
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for ( i=0; i < len; i++ ) {
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sum += cp[i];
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if ( sum >= 256 ) {
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sum -= 256;
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ovalue |= bit;
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}
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bit >>= 1;
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if ( bit == 0 ) {
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*ncp++ = ovalue;
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bit = 0x80;
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ovalue = 0;
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}
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}
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if ( bit != 0x80 )
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*ncp++ = ovalue;
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return rv;
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}
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static PyObject *
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imageop_dither2grey2(PyObject *self, PyObject *args)
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{
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int x, y, len;
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unsigned char *cp, *ncp;
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unsigned char ovalue;
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PyObject *rv;
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int i;
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int pos;
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int sum = 0, nvalue;
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if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
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return 0;
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if ( x*y != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, (len+3)/4);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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pos = 1;
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ovalue = 0;
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for ( i=0; i < len; i++ ) {
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sum += cp[i];
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nvalue = sum & 0x180;
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sum -= nvalue;
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ovalue |= nvalue >> pos;
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pos += 2;
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if ( pos == 9 ) {
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*ncp++ = ovalue;
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ovalue = 0;
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pos = 1;
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}
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}
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if ( pos != 0 )
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*ncp++ = ovalue;
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return rv;
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}
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static PyObject *
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imageop_mono2grey(PyObject *self, PyObject *args)
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{
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int v0, v1, x, y, len, nlen;
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unsigned char *cp, *ncp;
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PyObject *rv;
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int i, bit;
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if ( !PyArg_ParseTuple(args, "s#iiii", &cp, &len, &x, &y, &v0, &v1) )
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return 0;
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nlen = x*y;
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if ( (nlen+7)/8 != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, nlen);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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bit = 0x80;
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for ( i=0; i < nlen; i++ ) {
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if ( *cp & bit )
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*ncp++ = v1;
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else
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*ncp++ = v0;
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bit >>= 1;
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if ( bit == 0 ) {
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bit = 0x80;
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cp++;
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}
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}
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return rv;
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}
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static PyObject *
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imageop_grey22grey(PyObject *self, PyObject *args)
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{
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int x, y, len, nlen;
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unsigned char *cp, *ncp;
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PyObject *rv;
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int i, pos, value = 0, nvalue;
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if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
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return 0;
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nlen = x*y;
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if ( (nlen+3)/4 != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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rv = PyString_FromStringAndSize(NULL, nlen);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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pos = 0;
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for ( i=0; i < nlen; i++ ) {
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if ( pos == 0 ) {
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value = *cp++;
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pos = 8;
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}
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pos -= 2;
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nvalue = (value >> pos) & 0x03;
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*ncp++ = nvalue | (nvalue << 2) |
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(nvalue << 4) | (nvalue << 6);
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}
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return rv;
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}
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static PyObject *
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imageop_grey42grey(PyObject *self, PyObject *args)
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{
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int x, y, len, nlen;
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unsigned char *cp, *ncp;
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PyObject *rv;
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int i, pos, value = 0, nvalue;
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if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
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return 0;
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nlen = x*y;
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if ( (nlen+1)/2 != len ) {
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PyErr_SetString(ImageopError, "String has incorrect length");
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return 0;
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}
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|
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rv = PyString_FromStringAndSize(NULL, nlen);
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if ( rv == 0 )
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return 0;
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ncp = (unsigned char *)PyString_AsString(rv);
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pos = 0;
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for ( i=0; i < nlen; i++ ) {
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if ( pos == 0 ) {
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value = *cp++;
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pos = 8;
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}
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pos -= 4;
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nvalue = (value >> pos) & 0x0f;
|
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*ncp++ = nvalue | (nvalue << 4);
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}
|
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return rv;
|
|
}
|
|
|
|
static PyObject *
|
|
imageop_rgb2rgb8(PyObject *self, PyObject *args)
|
|
{
|
|
int x, y, len, nlen;
|
|
unsigned char *cp;
|
|
unsigned char *ncp;
|
|
PyObject *rv;
|
|
int i, r, g, b;
|
|
int backward_compatible = imageop_backward_compatible();
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
|
|
return 0;
|
|
|
|
nlen = x*y;
|
|
if ( nlen*4 != len ) {
|
|
PyErr_SetString(ImageopError, "String has incorrect length");
|
|
return 0;
|
|
}
|
|
|
|
rv = PyString_FromStringAndSize(NULL, nlen);
|
|
if ( rv == 0 )
|
|
return 0;
|
|
ncp = (unsigned char *)PyString_AsString(rv);
|
|
|
|
for ( i=0; i < nlen; i++ ) {
|
|
/* Bits in source: aaaaaaaa BBbbbbbb GGGggggg RRRrrrrr */
|
|
if (backward_compatible) {
|
|
Py_UInt32 value = * (Py_UInt32 *) cp;
|
|
cp += 4;
|
|
r = (int) ((value & 0xff) / 255. * 7. + .5);
|
|
g = (int) (((value >> 8) & 0xff) / 255. * 7. + .5);
|
|
b = (int) (((value >> 16) & 0xff) / 255. * 3. + .5);
|
|
} else {
|
|
cp++; /* skip alpha channel */
|
|
b = (int) (*cp++ / 255. * 3. + .5);
|
|
g = (int) (*cp++ / 255. * 7. + .5);
|
|
r = (int) (*cp++ / 255. * 7. + .5);
|
|
}
|
|
*ncp++ = (unsigned char)((r<<5) | (b<<3) | g);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static PyObject *
|
|
imageop_rgb82rgb(PyObject *self, PyObject *args)
|
|
{
|
|
int x, y, len, nlen;
|
|
unsigned char *cp;
|
|
unsigned char *ncp;
|
|
PyObject *rv;
|
|
int i, r, g, b;
|
|
unsigned char value;
|
|
int backward_compatible = imageop_backward_compatible();
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
|
|
return 0;
|
|
|
|
nlen = x*y;
|
|
if ( nlen != len ) {
|
|
PyErr_SetString(ImageopError, "String has incorrect length");
|
|
return 0;
|
|
}
|
|
|
|
rv = PyString_FromStringAndSize(NULL, nlen*4);
|
|
if ( rv == 0 )
|
|
return 0;
|
|
ncp = (unsigned char *)PyString_AsString(rv);
|
|
|
|
for ( i=0; i < nlen; i++ ) {
|
|
/* Bits in source: RRRBBGGG
|
|
** Red and Green are multiplied by 36.5, Blue by 85
|
|
*/
|
|
value = *cp++;
|
|
r = (value >> 5) & 7;
|
|
g = (value ) & 7;
|
|
b = (value >> 3) & 3;
|
|
r = (r<<5) | (r<<3) | (r>>1);
|
|
g = (g<<5) | (g<<3) | (g>>1);
|
|
b = (b<<6) | (b<<4) | (b<<2) | b;
|
|
if (backward_compatible) {
|
|
Py_UInt32 nvalue = r | (g<<8) | (b<<16);
|
|
* (Py_UInt32 *) ncp = nvalue;
|
|
ncp += 4;
|
|
} else {
|
|
*ncp++ = 0;
|
|
*ncp++ = b;
|
|
*ncp++ = g;
|
|
*ncp++ = r;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static PyObject *
|
|
imageop_rgb2grey(PyObject *self, PyObject *args)
|
|
{
|
|
int x, y, len, nlen;
|
|
unsigned char *cp;
|
|
unsigned char *ncp;
|
|
PyObject *rv;
|
|
int i, r, g, b;
|
|
int nvalue;
|
|
int backward_compatible = imageop_backward_compatible();
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
|
|
return 0;
|
|
|
|
nlen = x*y;
|
|
if ( nlen*4 != len ) {
|
|
PyErr_SetString(ImageopError, "String has incorrect length");
|
|
return 0;
|
|
}
|
|
|
|
rv = PyString_FromStringAndSize(NULL, nlen);
|
|
if ( rv == 0 )
|
|
return 0;
|
|
ncp = (unsigned char *)PyString_AsString(rv);
|
|
|
|
for ( i=0; i < nlen; i++ ) {
|
|
if (backward_compatible) {
|
|
Py_UInt32 value = * (Py_UInt32 *) cp;
|
|
cp += 4;
|
|
r = (int) ((value & 0xff) / 255. * 7. + .5);
|
|
g = (int) (((value >> 8) & 0xff) / 255. * 7. + .5);
|
|
b = (int) (((value >> 16) & 0xff) / 255. * 3. + .5);
|
|
} else {
|
|
cp++; /* skip alpha channel */
|
|
b = *cp++;
|
|
g = *cp++;
|
|
r = *cp++;
|
|
}
|
|
nvalue = (int)(0.30*r + 0.59*g + 0.11*b);
|
|
if ( nvalue > 255 ) nvalue = 255;
|
|
*ncp++ = (unsigned char)nvalue;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static PyObject *
|
|
imageop_grey2rgb(PyObject *self, PyObject *args)
|
|
{
|
|
int x, y, len, nlen;
|
|
unsigned char *cp;
|
|
unsigned char *ncp;
|
|
PyObject *rv;
|
|
int i;
|
|
unsigned char value;
|
|
int backward_compatible = imageop_backward_compatible();
|
|
|
|
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
|
|
return 0;
|
|
|
|
nlen = x*y;
|
|
if ( nlen != len ) {
|
|
PyErr_SetString(ImageopError, "String has incorrect length");
|
|
return 0;
|
|
}
|
|
|
|
rv = PyString_FromStringAndSize(NULL, nlen*4);
|
|
if ( rv == 0 )
|
|
return 0;
|
|
ncp = (unsigned char *)PyString_AsString(rv);
|
|
|
|
for ( i=0; i < nlen; i++ ) {
|
|
value = *cp++;
|
|
if (backward_compatible) {
|
|
* (Py_UInt32 *) ncp = (Py_UInt32) value | ((Py_UInt32) value << 8 ) | ((Py_UInt32) value << 16);
|
|
ncp += 4;
|
|
} else {
|
|
*ncp++ = 0;
|
|
*ncp++ = value;
|
|
*ncp++ = value;
|
|
*ncp++ = value;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
static object *
|
|
imageop_mul(object *self, object *args)
|
|
{
|
|
char *cp, *ncp;
|
|
int len, size, x, y;
|
|
object *rv;
|
|
int i;
|
|
|
|
if ( !getargs(args, "(s#iii)", &cp, &len, &size, &x, &y) )
|
|
return 0;
|
|
|
|
if ( size != 1 && size != 4 ) {
|
|
err_setstr(ImageopError, "Size should be 1 or 4");
|
|
return 0;
|
|
}
|
|
if ( len != size*x*y ) {
|
|
err_setstr(ImageopError, "String has incorrect length");
|
|
return 0;
|
|
}
|
|
|
|
rv = newsizedstringobject(NULL, XXXX);
|
|
if ( rv == 0 )
|
|
return 0;
|
|
ncp = (char *)getstringvalue(rv);
|
|
|
|
|
|
for ( i=0; i < len; i += size ) {
|
|
}
|
|
return rv;
|
|
}
|
|
*/
|
|
|
|
static PyMethodDef imageop_methods[] = {
|
|
{ "crop", imageop_crop, METH_VARARGS },
|
|
{ "scale", imageop_scale, METH_VARARGS },
|
|
{ "grey2mono", imageop_grey2mono, METH_VARARGS },
|
|
{ "grey2grey2", imageop_grey2grey2, METH_VARARGS },
|
|
{ "grey2grey4", imageop_grey2grey4, METH_VARARGS },
|
|
{ "dither2mono", imageop_dither2mono, METH_VARARGS },
|
|
{ "dither2grey2", imageop_dither2grey2, METH_VARARGS },
|
|
{ "mono2grey", imageop_mono2grey, METH_VARARGS },
|
|
{ "grey22grey", imageop_grey22grey, METH_VARARGS },
|
|
{ "grey42grey", imageop_grey42grey, METH_VARARGS },
|
|
{ "tovideo", imageop_tovideo, METH_VARARGS },
|
|
{ "rgb2rgb8", imageop_rgb2rgb8, METH_VARARGS },
|
|
{ "rgb82rgb", imageop_rgb82rgb, METH_VARARGS },
|
|
{ "rgb2grey", imageop_rgb2grey, METH_VARARGS },
|
|
{ "grey2rgb", imageop_grey2rgb, METH_VARARGS },
|
|
{ 0, 0 }
|
|
};
|
|
|
|
|
|
PyMODINIT_FUNC
|
|
initimageop(void)
|
|
{
|
|
PyObject *m;
|
|
m = Py_InitModule("imageop", imageop_methods);
|
|
ImageopDict = PyModule_GetDict(m);
|
|
ImageopError = PyErr_NewException("imageop.error", NULL, NULL);
|
|
if (ImageopError != NULL)
|
|
PyDict_SetItemString(ImageopDict, "error", ImageopError);
|
|
}
|