755 lines
16 KiB
C
755 lines
16 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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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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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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unsigned long min;
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unsigned long max;
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unsigned long wastebytes;
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char name[80];
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unsigned long colormap;
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long 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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unsigned long offset;
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unsigned long rleend; /* for rle images */
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unsigned long *rowstart; /* for rle images */
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long *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 Py_PROTO((unsigned char *, unsigned char *, int));
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static void setalpha Py_PROTO((unsigned char *, int));
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static void copybw Py_PROTO((long *, int));
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static void interleaverow Py_PROTO((unsigned char*, unsigned char*, int, int));
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static int compressrow Py_PROTO((unsigned char *, unsigned char *, int, int));
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static void lumrow Py_PROTO((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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addlongimgtag(dptr,xsize,ysize)
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unsigned long *dptr;
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int xsize, 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 getshort(inf)
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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 unsigned long getlong(inf)
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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 putshort(outf,val)
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FILE *outf;
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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 putlong(outf,val)
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FILE *outf;
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unsigned long val;
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{
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unsigned char buf[4];
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buf[0] = (val>>24);
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buf[1] = (val>>16);
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buf[2] = (val>>8);
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buf[3] = (val>>0);
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return fwrite(buf,4,1,outf);
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}
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static void readheader(inf,image)
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FILE *inf;
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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 writeheader(outf,image)
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FILE *outf;
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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 fwrite("no name",8,1,outf);
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}
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static int writetab(outf,tab,len)
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FILE *outf;
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/*unsigned*/ long *tab;
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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 -= 4;
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}
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return r;
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}
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static void readtab(inf,tab,len)
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FILE *inf;
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/*unsigned*/ long *tab;
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int len;
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{
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while(len) {
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*tab++ = getlong(inf);
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len -= 4;
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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(self, args)
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PyObject *self, *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_Parse(args, "s", &name))
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return NULL;
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inf = fopen(name,"r");
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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, "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(self, args)
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PyObject *self, *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, *verdat;
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long *starttab, *lengthtab;
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FILE *inf;
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IMAGE image;
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int y, z, tablen;
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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;
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if (!PyArg_Parse(args, "s", &name))
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return NULL;
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inf = fopen(name,"r");
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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,"bad magic number in image file");
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fclose(inf);
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return NULL;
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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,"image must have 1 byte per pix chan");
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fclose(inf);
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return NULL;
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}
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xsize = image.xsize;
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ysize = image.ysize;
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zsize = image.zsize;
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if(rle) {
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tablen = ysize*zsize*sizeof(long);
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starttab = (long *)malloc(tablen);
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lengthtab = (long *)malloc(tablen);
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rlebuflen = 1.05*xsize+10;
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rledat = (unsigned char *)malloc(rlebuflen);
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fseek(inf,512,SEEK_SET);
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readtab(inf,starttab,tablen);
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readtab(inf,lengthtab,tablen);
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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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rv = PyString_FromStringAndSize((char *) 0,
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(xsize*ysize+TAGLEN)*sizeof(long));
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if (rv == NULL) {
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fclose(inf);
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free(lengthtab);
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free(starttab);
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free(rledat);
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return NULL;
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}
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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 * sizeof(unsigned long);
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for(y=0; y<ysize; y++) {
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if(cur != starttab[y+z*ysize]) {
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fseek(inf,starttab[y+z*ysize],SEEK_SET);
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cur = starttab[y+z*ysize];
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}
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if(lengthtab[y+z*ysize]>rlebuflen) {
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PyErr_SetString(ImgfileError,
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"rlebuf is too small - bad poop");
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fclose(inf);
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Py_DECREF(rv);
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free(rledat);
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free(starttab);
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free(lengthtab);
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return NULL;
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}
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fread(rledat,lengthtab[y+z*ysize],1,inf);
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cur += lengthtab[y+z*ysize];
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expandrow(lptr,rledat,3-z);
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if (reverse_order)
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lptr -= xsize * sizeof(unsigned long);
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else
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lptr += xsize * sizeof(unsigned long);
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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 * sizeof(unsigned long);
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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(cur != starttab[y+z*ysize]) {
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fseek(inf,starttab[y+z*ysize],SEEK_SET);
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cur = starttab[y+z*ysize];
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}
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fread(rledat,lengthtab[y+z*ysize],1,inf);
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cur += lengthtab[y+z*ysize];
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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(unsigned long);
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else
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lptr += xsize * sizeof(unsigned long);
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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((long *) base,xsize*ysize);
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fclose(inf);
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free(starttab);
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free(lengthtab);
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free(rledat);
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return rv;
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} else {
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rv = PyString_FromStringAndSize((char *) 0,
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(xsize*ysize+TAGLEN)*sizeof(long));
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if (rv == NULL) {
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fclose(inf);
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return NULL;
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}
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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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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 * sizeof(unsigned long);
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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(unsigned long);
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else
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lptr += xsize * sizeof(unsigned long);
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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((long *) base,xsize*ysize);
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fclose(inf);
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free(verdat);
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return rv;
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}
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}
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/* static utility functions for longimagedata */
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static void interleaverow(lptr,cptr,z,n)
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unsigned char *lptr, *cptr;
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int z, 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 copybw(lptr,n)
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long *lptr;
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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 setalpha(lptr,n)
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unsigned char *lptr;
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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 expandrow(optr,iptr,z)
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unsigned char *optr, *iptr;
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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];
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optr[7*4] = iptr[7];
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optr += 8*4;
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iptr += 8;
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count -= 8;
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}
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while(count--) {
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*optr = *iptr++;
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optr+=4;
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}
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} else {
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pixel = *iptr++;
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while(count>=8) {
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optr[0*4] = pixel;
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optr[1*4] = pixel;
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optr[2*4] = pixel;
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optr[3*4] = pixel;
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optr[4*4] = pixel;
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optr[5*4] = pixel;
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optr[6*4] = pixel;
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optr[7*4] = pixel;
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optr += 8*4;
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count -= 8;
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}
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while(count--) {
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*optr = pixel;
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optr+=4;
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}
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}
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}
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}
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/*
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* longstoimage -
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* copy an array of longs to an iris image file. Each long
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* represents one pixel. xsize and ysize specify the dimensions of
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* the pixel array. zsize specifies what kind of image file to
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* write out. if zsize is 1, the luminance of the pixels are
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* calculated, and a sinlge channel black and white image is saved.
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* If zsize is 3, an RGB image file is saved. If zsize is 4, an
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* RGBA image file is saved.
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*
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*/
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static PyObject *
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longstoimage(self, args)
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PyObject *self, *args;
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{
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unsigned char *lptr;
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char *name;
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int xsize, ysize, zsize;
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FILE *outf;
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IMAGE image;
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int tablen, y, z, pos, len;
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long *starttab, *lengthtab;
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unsigned char *rlebuf;
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unsigned char *lumbuf;
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int rlebuflen, goodwrite;
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if (!PyArg_Parse(args, "(s#iiis)", &lptr, &len, &xsize, &ysize, &zsize,
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&name))
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return NULL;
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goodwrite = 1;
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outf = fopen(name,"w");
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if(!outf) {
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PyErr_SetString(ImgfileError,"can't open output file");
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return NULL;
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}
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tablen = ysize*zsize*sizeof(long);
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starttab = (long *)malloc(tablen);
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lengthtab = (long *)malloc(tablen);
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rlebuflen = 1.05*xsize+10;
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rlebuf = (unsigned char *)malloc(rlebuflen);
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lumbuf = (unsigned char *)malloc(xsize*sizeof(long));
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memset(&image,0,sizeof(IMAGE));
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image.imagic = IMAGIC;
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image.type = RLE(1);
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if(zsize>1)
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image.dim = 3;
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else
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image.dim = 2;
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image.xsize = xsize;
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image.ysize = ysize;
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image.zsize = zsize;
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image.min = 0;
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image.max = 255;
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goodwrite *= writeheader(outf,&image);
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fseek(outf,512+2*tablen,SEEK_SET);
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pos = 512+2*tablen;
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if (reverse_order)
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lptr += (ysize - 1) * xsize * sizeof(unsigned long);
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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(zsize == 1) {
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lumrow(lptr,lumbuf,xsize);
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len = compressrow(lumbuf,rlebuf,CHANOFFSET(z),xsize);
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} else {
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len = compressrow(lptr,rlebuf,CHANOFFSET(z),xsize);
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}
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if(len>rlebuflen) {
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PyErr_SetString(ImgfileError,"rlebuf is too small - bad poop");
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free(starttab);
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free(lengthtab);
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free(rlebuf);
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free(lumbuf);
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fclose(outf);
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return NULL;
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}
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goodwrite *= fwrite(rlebuf,len,1,outf);
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starttab[y+z*ysize] = pos;
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lengthtab[y+z*ysize] = len;
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pos += len;
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}
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if (reverse_order)
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lptr -= xsize * sizeof(unsigned long);
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else
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lptr += xsize * sizeof(unsigned long);
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}
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fseek(outf,512,SEEK_SET);
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goodwrite *= writetab(outf,starttab,tablen);
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goodwrite *= writetab(outf,lengthtab,tablen);
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free(starttab);
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free(lengthtab);
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free(rlebuf);
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free(lumbuf);
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fclose(outf);
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if(goodwrite) {
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Py_INCREF(Py_None);
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return Py_None;
|
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} else {
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PyErr_SetString(ImgfileError,"not enough space for image!!");
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return NULL;
|
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}
|
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}
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/* static utility functions for longstoimage */
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|
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static void lumrow(rgbptr,lumptr,n)
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unsigned char *rgbptr, *lumptr;
|
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int n;
|
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{
|
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lumptr += CHANOFFSET(0);
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while(n--) {
|
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*lumptr = ILUM(rgbptr[OFFSET_R],rgbptr[OFFSET_G],rgbptr[OFFSET_B]);
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lumptr += 4;
|
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rgbptr += 4;
|
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}
|
|
}
|
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|
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static int compressrow(lbuf,rlebuf,z,cnt)
|
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unsigned char *lbuf, *rlebuf;
|
|
int z, cnt;
|
|
{
|
|
unsigned char *iptr, *ibufend, *sptr, *optr;
|
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short todo, cc;
|
|
long count;
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|
|
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lbuf += z;
|
|
iptr = lbuf;
|
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ibufend = iptr+cnt*4;
|
|
optr = rlebuf;
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|
|
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while(iptr<ibufend) {
|
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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:count;
|
|
count -= todo;
|
|
*optr++ = 0x80|todo;
|
|
while(todo>8) {
|
|
optr[0] = sptr[0*4];
|
|
optr[1] = sptr[1*4];
|
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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:count;
|
|
count -= todo;
|
|
*optr++ = todo;
|
|
*optr++ = cc;
|
|
}
|
|
}
|
|
*optr++ = 0;
|
|
return optr - (unsigned char *)rlebuf;
|
|
}
|
|
|
|
static PyObject *
|
|
ttob(self, args)
|
|
PyObject *self;
|
|
PyObject *args;
|
|
{
|
|
int order, oldorder;
|
|
|
|
if (!PyArg_Parse(args, "i", &order))
|
|
return NULL;
|
|
oldorder = reverse_order;
|
|
reverse_order = order;
|
|
return PyInt_FromLong(oldorder);
|
|
}
|
|
|
|
static PyMethodDef rgbimg_methods[] = {
|
|
{"sizeofimage", sizeofimage},
|
|
{"longimagedata", longimagedata},
|
|
{"longstoimage", longstoimage},
|
|
{"ttob", ttob},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
void
|
|
initrgbimg()
|
|
{
|
|
PyObject *m, *d;
|
|
m = Py_InitModule("rgbimg", rgbimg_methods);
|
|
d = PyModule_GetDict(m);
|
|
ImgfileError = PyString_FromString("rgbimg.error");
|
|
if (ImgfileError == NULL || PyDict_SetItemString(d, "error", ImgfileError))
|
|
Py_FatalError("can't define rgbimg.error");
|
|
}
|