805 lines
17 KiB
C
805 lines
17 KiB
C
/*
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* fastimg -
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* Faster reading and writing of image files.
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*
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* This code should work on machines with any byte order.
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*
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* Could someone make this run real fast using multiple processors
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* or how about using memory mapped files to speed it up?
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*
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* Paul Haeberli - 1991
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*
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* Changed to return sizes.
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* Sjoerd Mullender - 1993
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* Changed to incorporate into Python.
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* Sjoerd Mullender - 1993
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*/
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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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#include <string.h>
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/*
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* from image.h
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*
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*/
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typedef struct {
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unsigned short imagic; /* stuff saved on disk . . */
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unsigned short type;
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unsigned short dim;
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unsigned short xsize;
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unsigned short ysize;
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unsigned short zsize;
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Py_UInt32 min;
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Py_UInt32 max;
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Py_UInt32 wastebytes;
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char name[80];
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Py_UInt32 colormap;
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Py_Int32 file; /* stuff used in core only */
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unsigned short flags;
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short dorev;
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short x;
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short y;
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short z;
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short cnt;
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unsigned short *ptr;
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unsigned short *base;
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unsigned short *tmpbuf;
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Py_UInt32 offset;
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Py_UInt32 rleend; /* for rle images */
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Py_UInt32 *rowstart; /* for rle images */
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Py_Int32 *rowsize; /* for rle images */
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} IMAGE;
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#define IMAGIC 0732
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#define TYPEMASK 0xff00
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#define BPPMASK 0x00ff
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#define ITYPE_VERBATIM 0x0000
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#define ITYPE_RLE 0x0100
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#define ISRLE(type) (((type) & 0xff00) == ITYPE_RLE)
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#define ISVERBATIM(type) (((type) & 0xff00) == ITYPE_VERBATIM)
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#define BPP(type) ((type) & BPPMASK)
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#define RLE(bpp) (ITYPE_RLE | (bpp))
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#define VERBATIM(bpp) (ITYPE_VERBATIM | (bpp))
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/*
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* end of image.h stuff
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*
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*/
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#define RINTLUM (79)
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#define GINTLUM (156)
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#define BINTLUM (21)
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#define ILUM(r,g,b) ((int)(RINTLUM*(r)+GINTLUM*(g)+BINTLUM*(b))>>8)
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#define OFFSET_R 3 /* this is byte order dependent */
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#define OFFSET_G 2
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#define OFFSET_B 1
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#define OFFSET_A 0
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#define CHANOFFSET(z) (3-(z)) /* this is byte order dependent */
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static void expandrow(unsigned char *, unsigned char *, int);
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static void setalpha(unsigned char *, int);
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static void copybw(Py_Int32 *, int);
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static void interleaverow(unsigned char*, unsigned char*, int, int);
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static int compressrow(unsigned char *, unsigned char *, int, int);
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static void lumrow(unsigned char *, unsigned char *, int);
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#ifdef ADD_TAGS
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#define TAGLEN (5)
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#else
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#define TAGLEN (0)
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#endif
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static PyObject *ImgfileError;
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static int reverse_order;
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#ifdef ADD_TAGS
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/*
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* addlongimgtag -
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* this is used to extract image data from core dumps.
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*
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*/
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static void
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addlongimgtag(Py_UInt32 *dptr, int xsize, int ysize)
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{
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dptr = dptr + (xsize * ysize);
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dptr[0] = 0x12345678;
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dptr[1] = 0x59493333;
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dptr[2] = 0x69434222;
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dptr[3] = xsize;
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dptr[4] = ysize;
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}
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#endif
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/*
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* byte order independent read/write of shorts and longs.
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*
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*/
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static unsigned short
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getshort(FILE *inf)
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{
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unsigned char buf[2];
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fread(buf, 2, 1, inf);
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return (buf[0] << 8) + (buf[1] << 0);
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}
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static Py_UInt32
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getlong(FILE *inf)
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{
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unsigned char buf[4];
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fread(buf, 4, 1, inf);
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return (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + (buf[3] << 0);
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}
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static void
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putshort(FILE *outf, unsigned short val)
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{
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unsigned char buf[2];
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buf[0] = (val >> 8);
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buf[1] = (val >> 0);
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fwrite(buf, 2, 1, outf);
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}
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static int
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putlong(FILE *outf, Py_UInt32 val)
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{
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unsigned char buf[4];
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buf[0] = (unsigned char) (val >> 24);
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buf[1] = (unsigned char) (val >> 16);
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buf[2] = (unsigned char) (val >> 8);
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buf[3] = (unsigned char) (val >> 0);
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return (int)fwrite(buf, 4, 1, outf);
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}
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static void
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readheader(FILE *inf, IMAGE *image)
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{
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memset(image ,0, sizeof(IMAGE));
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image->imagic = getshort(inf);
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image->type = getshort(inf);
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image->dim = getshort(inf);
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image->xsize = getshort(inf);
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image->ysize = getshort(inf);
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image->zsize = getshort(inf);
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}
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static int
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writeheader(FILE *outf, IMAGE *image)
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{
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IMAGE t;
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memset(&t, 0, sizeof(IMAGE));
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fwrite(&t, sizeof(IMAGE), 1, outf);
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fseek(outf, 0, SEEK_SET);
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putshort(outf, image->imagic);
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putshort(outf, image->type);
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putshort(outf, image->dim);
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putshort(outf, image->xsize);
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putshort(outf, image->ysize);
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putshort(outf, image->zsize);
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putlong(outf, image->min);
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putlong(outf, image->max);
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putlong(outf, 0);
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return (int)fwrite("no name", 8, 1, outf);
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}
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static int
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writetab(FILE *outf, /*unsigned*/ Py_Int32 *tab, int len)
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{
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int r = 0;
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while(len) {
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r = putlong(outf, *tab++);
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len--;
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}
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return r;
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}
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static void
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readtab(FILE *inf, /*unsigned*/ Py_Int32 *tab, int len)
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{
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while(len) {
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*tab++ = getlong(inf);
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len--;
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}
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}
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/*
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* sizeofimage -
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* return the xsize and ysize of an iris image file.
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*
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*/
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static PyObject *
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sizeofimage(PyObject *self, PyObject *args)
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{
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char *name;
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IMAGE image;
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FILE *inf;
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if (!PyArg_ParseTuple(args, "s:sizeofimage", &name))
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return NULL;
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inf = fopen(name, "rb");
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if (!inf) {
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PyErr_SetString(ImgfileError, "can't open image file");
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return NULL;
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}
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readheader(inf, &image);
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fclose(inf);
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if (image.imagic != IMAGIC) {
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PyErr_SetString(ImgfileError,
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"bad magic number in image file");
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return NULL;
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}
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return Py_BuildValue("(ii)", image.xsize, image.ysize);
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}
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/*
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* longimagedata -
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* read in a B/W RGB or RGBA iris image file and return a
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* pointer to an array of longs.
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*
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*/
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static PyObject *
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longimagedata(PyObject *self, PyObject *args)
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{
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char *name;
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unsigned char *base, *lptr;
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unsigned char *rledat = NULL, *verdat = NULL;
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Py_Int32 *starttab = NULL, *lengthtab = NULL;
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FILE *inf = NULL;
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IMAGE image;
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int y, z, tablen, new_size;
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int xsize, ysize, zsize;
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int bpp, rle, cur, badorder;
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int rlebuflen;
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PyObject *rv = NULL;
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if (!PyArg_ParseTuple(args, "s:longimagedata", &name))
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return NULL;
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inf = fopen(name,"rb");
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if (!inf) {
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PyErr_SetString(ImgfileError, "can't open image file");
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return NULL;
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}
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readheader(inf,&image);
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if (image.imagic != IMAGIC) {
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PyErr_SetString(ImgfileError,
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"bad magic number in image file");
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goto finally;
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}
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rle = ISRLE(image.type);
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bpp = BPP(image.type);
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if (bpp != 1) {
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PyErr_SetString(ImgfileError,
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"image must have 1 byte per pix chan");
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goto finally;
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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 (rle) {
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tablen = ysize * zsize * sizeof(Py_Int32);
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rlebuflen = (int) (1.05 * xsize +10);
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if ((tablen / sizeof(Py_Int32)) != (ysize * zsize) ||
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rlebuflen < 0) {
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PyErr_NoMemory();
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goto finally;
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}
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starttab = (Py_Int32 *)malloc(tablen);
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lengthtab = (Py_Int32 *)malloc(tablen);
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rledat = (unsigned char *)malloc(rlebuflen);
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if (!starttab || !lengthtab || !rledat) {
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PyErr_NoMemory();
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goto finally;
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}
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fseek(inf, 512, SEEK_SET);
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readtab(inf, starttab, ysize*zsize);
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readtab(inf, lengthtab, ysize*zsize);
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/* check data order */
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cur = 0;
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badorder = 0;
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for(y = 0; y < ysize; y++) {
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for(z = 0; z < zsize; z++) {
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if (starttab[y + z * ysize] < cur) {
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badorder = 1;
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break;
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}
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cur = starttab[y +z * ysize];
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}
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if (badorder)
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break;
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}
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fseek(inf, 512 + 2 * tablen, SEEK_SET);
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cur = 512 + 2 * tablen;
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new_size = xsize * ysize + TAGLEN;
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if (new_size < 0 || (new_size * sizeof(Py_Int32)) < 0) {
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PyErr_NoMemory();
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goto finally;
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}
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rv = PyString_FromStringAndSize((char *)NULL,
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new_size * sizeof(Py_Int32));
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if (rv == NULL)
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goto finally;
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base = (unsigned char *) PyString_AsString(rv);
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#ifdef ADD_TAGS
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addlongimgtag(base,xsize,ysize);
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#endif
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if (badorder) {
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for (z = 0; z < zsize; z++) {
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lptr = base;
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if (reverse_order)
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lptr += (ysize - 1) * xsize
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* sizeof(Py_UInt32);
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for (y = 0; y < ysize; y++) {
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int idx = y + z * ysize;
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if (cur != starttab[idx]) {
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fseek(inf,starttab[idx],
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SEEK_SET);
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cur = starttab[idx];
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}
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if (lengthtab[idx] > rlebuflen) {
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PyErr_SetString(ImgfileError,
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"rlebuf is too small");
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Py_DECREF(rv);
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rv = NULL;
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goto finally;
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}
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fread(rledat, lengthtab[idx], 1, inf);
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cur += lengthtab[idx];
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expandrow(lptr, rledat, 3-z);
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if (reverse_order)
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lptr -= xsize
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* sizeof(Py_UInt32);
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else
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lptr += xsize
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* sizeof(Py_UInt32);
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}
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}
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} else {
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lptr = base;
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if (reverse_order)
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lptr += (ysize - 1) * xsize
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* sizeof(Py_UInt32);
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for (y = 0; y < ysize; y++) {
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for(z = 0; z < zsize; z++) {
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int idx = y + z * ysize;
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if (cur != starttab[idx]) {
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fseek(inf, starttab[idx],
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SEEK_SET);
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cur = starttab[idx];
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}
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fread(rledat, lengthtab[idx], 1, inf);
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cur += lengthtab[idx];
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expandrow(lptr, rledat, 3-z);
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}
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if (reverse_order)
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lptr -= xsize * sizeof(Py_UInt32);
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else
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lptr += xsize * sizeof(Py_UInt32);
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}
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}
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if (zsize == 3)
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setalpha(base, xsize * ysize);
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else if (zsize < 3)
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copybw((Py_Int32 *) base, xsize * ysize);
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}
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else {
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new_size = xsize * ysize + TAGLEN;
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if (new_size < 0 || (new_size * sizeof(Py_Int32)) < 0) {
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PyErr_NoMemory();
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goto finally;
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}
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rv = PyString_FromStringAndSize((char *) 0,
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new_size*sizeof(Py_Int32));
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if (rv == NULL)
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goto finally;
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base = (unsigned char *) PyString_AsString(rv);
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#ifdef ADD_TAGS
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addlongimgtag(base, xsize, ysize);
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#endif
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verdat = (unsigned char *)malloc(xsize);
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if (!verdat) {
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Py_CLEAR(rv);
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goto finally;
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}
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fseek(inf, 512, SEEK_SET);
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for (z = 0; z < zsize; z++) {
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lptr = base;
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if (reverse_order)
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lptr += (ysize - 1) * xsize
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* sizeof(Py_UInt32);
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for (y = 0; y < ysize; y++) {
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fread(verdat, xsize, 1, inf);
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interleaverow(lptr, verdat, 3-z, xsize);
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if (reverse_order)
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lptr -= xsize * sizeof(Py_UInt32);
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else
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lptr += xsize * sizeof(Py_UInt32);
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}
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}
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if (zsize == 3)
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setalpha(base, xsize * ysize);
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else if (zsize < 3)
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copybw((Py_Int32 *) base, xsize * ysize);
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}
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finally:
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if (starttab)
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free(starttab);
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if (lengthtab)
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free(lengthtab);
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if (rledat)
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free(rledat);
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if (verdat)
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free(verdat);
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fclose(inf);
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return rv;
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}
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/* static utility functions for longimagedata */
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static void
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interleaverow(unsigned char *lptr, unsigned char *cptr, int z, int n)
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{
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lptr += z;
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while (n--) {
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*lptr = *cptr++;
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lptr += 4;
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}
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}
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static void
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copybw(Py_Int32 *lptr, int n)
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{
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while (n >= 8) {
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lptr[0] = 0xff000000 + (0x010101 * (lptr[0] & 0xff));
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lptr[1] = 0xff000000 + (0x010101 * (lptr[1] & 0xff));
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lptr[2] = 0xff000000 + (0x010101 * (lptr[2] & 0xff));
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lptr[3] = 0xff000000 + (0x010101 * (lptr[3] & 0xff));
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lptr[4] = 0xff000000 + (0x010101 * (lptr[4] & 0xff));
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lptr[5] = 0xff000000 + (0x010101 * (lptr[5] & 0xff));
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lptr[6] = 0xff000000 + (0x010101 * (lptr[6] & 0xff));
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lptr[7] = 0xff000000 + (0x010101 * (lptr[7] & 0xff));
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lptr += 8;
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n -= 8;
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}
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while (n--) {
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*lptr = 0xff000000 + (0x010101 * (*lptr&0xff));
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lptr++;
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}
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}
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static void
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setalpha(unsigned char *lptr, int n)
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{
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while (n >= 8) {
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lptr[0 * 4] = 0xff;
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lptr[1 * 4] = 0xff;
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lptr[2 * 4] = 0xff;
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lptr[3 * 4] = 0xff;
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lptr[4 * 4] = 0xff;
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lptr[5 * 4] = 0xff;
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lptr[6 * 4] = 0xff;
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lptr[7 * 4] = 0xff;
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lptr += 4 * 8;
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n -= 8;
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}
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while (n--) {
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*lptr = 0xff;
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lptr += 4;
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}
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}
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static void
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expandrow(unsigned char *optr, unsigned char *iptr, int z)
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{
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unsigned char pixel, count;
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optr += z;
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while (1) {
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pixel = *iptr++;
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if (!(count = (pixel & 0x7f)))
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return;
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if (pixel & 0x80) {
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while (count >= 8) {
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optr[0 * 4] = iptr[0];
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optr[1 * 4] = iptr[1];
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optr[2 * 4] = iptr[2];
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optr[3 * 4] = iptr[3];
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optr[4 * 4] = iptr[4];
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optr[5 * 4] = iptr[5];
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|
optr[6 * 4] = iptr[6];
|
|
optr[7 * 4] = iptr[7];
|
|
optr += 8 * 4;
|
|
iptr += 8;
|
|
count -= 8;
|
|
}
|
|
while (count--) {
|
|
*optr = *iptr++;
|
|
optr += 4;
|
|
}
|
|
}
|
|
else {
|
|
pixel = *iptr++;
|
|
while (count >= 8) {
|
|
optr[0 * 4] = pixel;
|
|
optr[1 * 4] = pixel;
|
|
optr[2 * 4] = pixel;
|
|
optr[3 * 4] = pixel;
|
|
optr[4 * 4] = pixel;
|
|
optr[5 * 4] = pixel;
|
|
optr[6 * 4] = pixel;
|
|
optr[7 * 4] = pixel;
|
|
optr += 8 * 4;
|
|
count -= 8;
|
|
}
|
|
while (count--) {
|
|
*optr = pixel;
|
|
optr += 4;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* longstoimage -
|
|
* copy an array of longs to an iris image file. Each long
|
|
* represents one pixel. xsize and ysize specify the dimensions of
|
|
* the pixel array. zsize specifies what kind of image file to
|
|
* write out. if zsize is 1, the luminance of the pixels are
|
|
* calculated, and a single channel black and white image is saved.
|
|
* If zsize is 3, an RGB image file is saved. If zsize is 4, an
|
|
* RGBA image file is saved.
|
|
*
|
|
*/
|
|
static PyObject *
|
|
longstoimage(PyObject *self, PyObject *args)
|
|
{
|
|
unsigned char *lptr;
|
|
char *name;
|
|
int xsize, ysize, zsize;
|
|
FILE *outf = NULL;
|
|
IMAGE image;
|
|
int tablen, y, z, pos, len;
|
|
Py_Int32 *starttab = NULL, *lengthtab = NULL;
|
|
unsigned char *rlebuf = NULL;
|
|
unsigned char *lumbuf = NULL;
|
|
int rlebuflen;
|
|
Py_ssize_t goodwrite;
|
|
PyObject *retval = NULL;
|
|
|
|
if (!PyArg_ParseTuple(args, "s#iiis:longstoimage", &lptr, &len,
|
|
&xsize, &ysize, &zsize, &name))
|
|
return NULL;
|
|
|
|
goodwrite = 1;
|
|
outf = fopen(name, "wb");
|
|
if (!outf) {
|
|
PyErr_SetString(ImgfileError, "can't open output file");
|
|
return NULL;
|
|
}
|
|
tablen = ysize * zsize * sizeof(Py_Int32);
|
|
rlebuflen = (int) (1.05 * xsize + 10);
|
|
|
|
if ((tablen / sizeof(Py_Int32)) != (ysize * zsize) ||
|
|
rlebuflen < 0 || (xsize * sizeof(Py_Int32)) < 0) {
|
|
PyErr_NoMemory();
|
|
goto finally;
|
|
}
|
|
|
|
starttab = (Py_Int32 *)malloc(tablen);
|
|
lengthtab = (Py_Int32 *)malloc(tablen);
|
|
rlebuf = (unsigned char *)malloc(rlebuflen);
|
|
lumbuf = (unsigned char *)malloc(xsize * sizeof(Py_Int32));
|
|
if (!starttab || !lengthtab || !rlebuf || !lumbuf) {
|
|
PyErr_NoMemory();
|
|
goto finally;
|
|
}
|
|
|
|
memset(&image, 0, sizeof(IMAGE));
|
|
image.imagic = IMAGIC;
|
|
image.type = RLE(1);
|
|
if (zsize>1)
|
|
image.dim = 3;
|
|
else
|
|
image.dim = 2;
|
|
image.xsize = xsize;
|
|
image.ysize = ysize;
|
|
image.zsize = zsize;
|
|
image.min = 0;
|
|
image.max = 255;
|
|
goodwrite *= writeheader(outf, &image);
|
|
pos = 512 + 2 * tablen;
|
|
fseek(outf, pos, SEEK_SET);
|
|
if (reverse_order)
|
|
lptr += (ysize - 1) * xsize * sizeof(Py_UInt32);
|
|
for (y = 0; y < ysize; y++) {
|
|
for (z = 0; z < zsize; z++) {
|
|
if (zsize == 1) {
|
|
lumrow(lptr, lumbuf, xsize);
|
|
len = compressrow(lumbuf, rlebuf,
|
|
CHANOFFSET(z), xsize);
|
|
} else {
|
|
len = compressrow(lptr, rlebuf,
|
|
CHANOFFSET(z), xsize);
|
|
}
|
|
if(len > rlebuflen) {
|
|
PyErr_SetString(ImgfileError,
|
|
"rlebuf is too small");
|
|
goto finally;
|
|
}
|
|
goodwrite *= fwrite(rlebuf, len, 1, outf);
|
|
starttab[y + z * ysize] = pos;
|
|
lengthtab[y + z * ysize] = len;
|
|
pos += len;
|
|
}
|
|
if (reverse_order)
|
|
lptr -= xsize * sizeof(Py_UInt32);
|
|
else
|
|
lptr += xsize * sizeof(Py_UInt32);
|
|
}
|
|
|
|
fseek(outf, 512, SEEK_SET);
|
|
goodwrite *= writetab(outf, starttab, ysize*zsize);
|
|
goodwrite *= writetab(outf, lengthtab, ysize*zsize);
|
|
if (goodwrite) {
|
|
Py_INCREF(Py_None);
|
|
retval = Py_None;
|
|
} else
|
|
PyErr_SetString(ImgfileError, "not enough space for image");
|
|
|
|
finally:
|
|
fclose(outf);
|
|
free(starttab);
|
|
free(lengthtab);
|
|
free(rlebuf);
|
|
free(lumbuf);
|
|
return retval;
|
|
}
|
|
|
|
/* static utility functions for longstoimage */
|
|
|
|
static void
|
|
lumrow(unsigned char *rgbptr, unsigned char *lumptr, int n)
|
|
{
|
|
lumptr += CHANOFFSET(0);
|
|
while (n--) {
|
|
*lumptr = ILUM(rgbptr[OFFSET_R],
|
|
rgbptr[OFFSET_G],
|
|
rgbptr[OFFSET_B]);
|
|
lumptr += 4;
|
|
rgbptr += 4;
|
|
}
|
|
}
|
|
|
|
static int
|
|
compressrow(unsigned char *lbuf, unsigned char *rlebuf, int z, int cnt)
|
|
{
|
|
unsigned char *iptr, *ibufend, *sptr, *optr;
|
|
short todo, cc;
|
|
Py_Int32 count;
|
|
|
|
lbuf += z;
|
|
iptr = lbuf;
|
|
ibufend = iptr + cnt * 4;
|
|
optr = rlebuf;
|
|
|
|
while(iptr < ibufend) {
|
|
sptr = iptr;
|
|
iptr += 8;
|
|
while ((iptr<ibufend) &&
|
|
((iptr[-8]!=iptr[-4]) ||(iptr[-4]!=iptr[0])))
|
|
{
|
|
iptr += 4;
|
|
}
|
|
iptr -= 8;
|
|
count = (iptr - sptr) / 4;
|
|
while (count) {
|
|
todo = count > 126 ? 126 : (short)count;
|
|
count -= todo;
|
|
*optr++ = 0x80 | todo;
|
|
while (todo > 8) {
|
|
optr[0] = sptr[0 * 4];
|
|
optr[1] = sptr[1 * 4];
|
|
optr[2] = sptr[2 * 4];
|
|
optr[3] = sptr[3 * 4];
|
|
optr[4] = sptr[4 * 4];
|
|
optr[5] = sptr[5 * 4];
|
|
optr[6] = sptr[6 * 4];
|
|
optr[7] = sptr[7 * 4];
|
|
optr += 8;
|
|
sptr += 8 * 4;
|
|
todo -= 8;
|
|
}
|
|
while (todo--) {
|
|
*optr++ = *sptr;
|
|
sptr += 4;
|
|
}
|
|
}
|
|
sptr = iptr;
|
|
cc = *iptr;
|
|
iptr += 4;
|
|
while ((iptr < ibufend) && (*iptr == cc))
|
|
iptr += 4;
|
|
count = (iptr - sptr) / 4;
|
|
while (count) {
|
|
todo = count > 126 ? 126 : (short)count;
|
|
count -= todo;
|
|
*optr++ = (unsigned char) todo;
|
|
*optr++ = (unsigned char) cc;
|
|
}
|
|
}
|
|
*optr++ = 0;
|
|
return optr - (unsigned char *)rlebuf;
|
|
}
|
|
|
|
static PyObject *
|
|
ttob(PyObject *self, PyObject *args)
|
|
{
|
|
int order, oldorder;
|
|
|
|
if (!PyArg_ParseTuple(args, "i:ttob", &order))
|
|
return NULL;
|
|
oldorder = reverse_order;
|
|
reverse_order = order;
|
|
return PyInt_FromLong(oldorder);
|
|
}
|
|
|
|
static PyMethodDef
|
|
rgbimg_methods[] = {
|
|
{"sizeofimage", sizeofimage, METH_VARARGS},
|
|
{"longimagedata", longimagedata, METH_VARARGS},
|
|
{"longstoimage", longstoimage, METH_VARARGS},
|
|
{"ttob", ttob, METH_VARARGS},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
|
|
PyMODINIT_FUNC
|
|
initrgbimg(void)
|
|
{
|
|
PyObject *m, *d;
|
|
m = Py_InitModule("rgbimg", rgbimg_methods);
|
|
if (m == NULL)
|
|
return;
|
|
|
|
if (PyErr_Warn(PyExc_DeprecationWarning,
|
|
"the rgbimg module is deprecated"))
|
|
return;
|
|
|
|
d = PyModule_GetDict(m);
|
|
ImgfileError = PyErr_NewException("rgbimg.error", NULL, NULL);
|
|
if (ImgfileError != NULL)
|
|
PyDict_SetItemString(d, "error", ImgfileError);
|
|
}
|