2314 lines
56 KiB
C
2314 lines
56 KiB
C
/*
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* li_recognizer.c
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*
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* Copyright 2000 Compaq Computer Corporation.
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* Copying or modifying this code for any purpose is permitted,
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* provided that this copyright notice is preserved in its entirety
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* in all copies or modifications.
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* COMPAQ COMPUTER CORPORATION MAKES NO WARRANTIES, EXPRESSED OR
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* IMPLIED, AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR
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*
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*
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* Adapted from cmu_recognizer.c by Jay Kistler.
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*
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* Where is the CMU copyright???? Gotta track it down - Jim Gettys
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*
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* Credit to Dean Rubine, Jim Kempf, and Ari Rapkin.
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*/
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#include <u.h>
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#include <libc.h>
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#include <stdio.h>
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#include <draw.h>
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#include <scribble.h>
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#include "scribbleimpl.h"
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#include "hre_internal.h"
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#include "li_recognizer_internal.h"
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int lidebug = 0;
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#define LI_MAGIC 0xACCBADDD
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#define CHECK_LI_MAGIC(_a) \
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((_a) != nil && ((li_recognizer*)(_a))->li_magic == LI_MAGIC)
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static void lialg_initialize(rClassifier *);
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static int lialg_read_classifier_digest(rClassifier *);
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static int lialg_canonicalize_examples(rClassifier *);
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static char *lialg_recognize_stroke(rClassifier *, point_list *);
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static void lialg_compute_lpf_parameters(void);
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char* li_err_msg = nil;
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#define bcopy(s1,s2,n) memmove(s2,s1,n)
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/*Freeing classifier*/
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static void
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free_rClassifier(rClassifier* rc);
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/*
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* Point List Support
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*/
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static point_list*
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add_example(point_list* l,int npts,pen_point* pts)
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{
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pen_point* lpts = mallocz(npts*sizeof(pen_point), 1);
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point_list *p = malloc(sizeof(point_list));
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p->npts = npts;
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p->pts = lpts;
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p->next = l; /*Order doesn't matter, so we stick on end.*/
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/*Copy points.*/
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bcopy(pts, lpts, npts * sizeof(pen_point));
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return(p);
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}
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static void
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delete_examples(point_list* l)
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{
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point_list* p;
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for( ; l != nil; l = p ) {
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p = l->next;
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free(l->pts);
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free(l);
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}
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}
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/*
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* Local functions
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*/
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/*
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* recognize_internal-Form Vector, use Classifier to classify, return char.
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*/
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static char*
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recognize_internal(rClassifier* rec, Stroke* str, int*)
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{
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char *res;
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point_list *stroke;
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stroke = add_example(nil, str->npts, str->pts);
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if (stroke == nil) return(nil);
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res = lialg_recognize_stroke(rec, stroke);
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delete_examples(stroke);
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return(res);
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}
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/*
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* file_path-Construct pathname, check for proper extension.
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*/
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static int
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file_path(char* dir,char* filename,char* pathname)
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{
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char* dot;
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/*Check for proper extension on file name.*/
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dot = strrchr(filename,'.');
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if( dot == nil ) {
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return(-1);
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}
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/*Determine whether a gesture or character classifier.*/
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if( strcmp(dot,LI_CLASSIFIER_EXTENSION) != 0 ) {
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return(-1);
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}
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/*Concatenate directory and filename into pathname.*/
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strcpy(pathname,dir);
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strcat(pathname,"/");
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strcat(pathname,filename);
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return(0);
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}
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/*read_classifier_points-Read points so classifier can be extended.*/
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static int
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read_classifier_points(FILE* fd,int nclss,point_list** ex,char** cnames)
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{
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int i,j,k;
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char buf[BUFSIZ];
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int nex = 0;
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char* names[MAXSCLASSES];
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point_list* examples[MAXSCLASSES];
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pen_point* pts;
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int npts;
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/*Initialize*/
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for( i = 0; i < MAXSCLASSES; i++ ) {
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names[i] = nil;
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examples[i] = nil;
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}
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/*Go thru classes.*/
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for( k = 0; k < nclss; k++ ) {
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/*Read class name and number of examples.*/
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if( fscanf(fd,"%d %s",&nex,buf) != 2 )
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goto unallocate;
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/*Save class name*/
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names[k] = strdup(buf);
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/*Read examples.*/
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for( i = 0; i < nex; i++ ) {
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/*Read number of points.*/
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if( fscanf(fd,"%d",&npts) != 1 )
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goto unallocate; /*Boy would I like exceptions!*/
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/*Allocate array for points.*/
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if( (pts = mallocz(npts*sizeof(pen_point), 1)) == nil )
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goto unallocate;
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/*Read in points.*/
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for( j = 0; j < npts; j++ ) {
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int x,y;
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if( fscanf(fd,"%d %d",&x,&y) != 2 ) {
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delete_pen_point_array(pts);
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goto unallocate;
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}
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pts[j].Point = Pt(x, y);
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}
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/*Add example*/
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if( (examples[k] = add_example(examples[k],npts,pts)) == nil ) {
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delete_pen_point_array(pts);
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goto unallocate;
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}
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delete_pen_point_array(pts);
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}
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}
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/* ari -- end of list of classes */
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/* fprint(2, "]\n"); */
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/*Transfer to recognizer.*/
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bcopy(examples,ex,sizeof(examples));
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bcopy(names,cnames,sizeof(names));
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return(0);
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/*Error. Deallocate memory and return.*/
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unallocate:
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for( ; k >= 0; k-- ) {
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delete_examples(examples[k]);
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free(names[k]);
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}
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return(-1);
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}
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/*read_classifier-Read a classifier file.*/
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static int read_classifier(FILE* fd,rClassifier* rc)
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{
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li_err_msg = nil;
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/*Read in classifier file.*/
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if(fscanf(fd, "%d", &rc->nclasses) != 1)
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return -1;
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/*Read in the example points, so classifier can be extended.*/
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if( read_classifier_points(fd,rc->nclasses,rc->ex,rc->cnames) != 0 )
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return -1;
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return(0);
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}
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/*
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* Extension Functions
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*/
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/* getClasses and clearState are by Ari */
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static int
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recognizer_getClasses (recognizer r, char ***list, int *nc)
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{
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int i, nclasses;
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li_recognizer* rec;
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char **ret;
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rec = (li_recognizer*)r->recognizer_specific;
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/*Check for LI recognizer.*/
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if( !CHECK_LI_MAGIC(rec) ) {
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li_err_msg = "Not a LI recognizer";
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return(-1);
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}
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*nc = nclasses = rec->li_rc.nclasses;
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ret = malloc(nclasses*sizeof(char*));
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for (i = 0; i < nclasses; i++)
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ret[i] = rec->li_rc.cnames[i]; /* only the 1st char of the cname */
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*list = ret;
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return 0;
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}
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static int
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recognizer_clearState (recognizer)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Clearing state is not supported by the LI recognizer";
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return(-1);
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}
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static bool isa_li(recognizer r)
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{ return(CHECK_LI_MAGIC(r)); }
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static int
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recognizer_train(recognizer, rc*, uint, Stroke*, rec_element*, bool)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Training is not supported by the LI recognizer";
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return(-1);
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}
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int
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li_recognizer_get_example (recognizer r,
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int class,
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int instance,
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char **name,
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pen_point **points,
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int *npts)
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{
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li_recognizer *rec = (li_recognizer*)r->recognizer_specific;
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int nclasses = rec->li_rc.nclasses;
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point_list *pl;
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if( !CHECK_LI_MAGIC(rec) ) {
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li_err_msg = "Not a LI recognizer";
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return(-1);
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}
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if (class > nclasses)
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return -1;
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pl = rec->li_rc.canonex[class];
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while (instance && pl)
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{
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pl = pl->next;
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instance--;
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}
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if (!pl)
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return -1;
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*name = rec->li_rc.cnames[class];
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*points = pl->pts;
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*npts = pl->npts;
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return pl->npts; /* I hope [sjm] */
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}
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/*
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* API Functions
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*/
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/*li_recognizer_load-Load a classifier file.*/
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static int li_recognizer_load(recognizer r, char* dir, char* filename)
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{
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FILE *fd;
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char* pathname;
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li_recognizer* rec;
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rClassifier* rc;
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rec = (li_recognizer*)r->recognizer_specific;
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/*Make sure recognizer's OK*/
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if( !CHECK_LI_MAGIC(rec) ) {
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li_err_msg = "Not a LI recognizer";
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return(-1);
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}
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rc = &(rec->li_rc);
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/*Check parameters.*/
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if( filename == nil ) {
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li_err_msg = "Invalid parameters";
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return(-1);
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}
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/*We let the directory be null.*/
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if( dir == nil || (int)strlen(dir) <= 0 ) {
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dir = ".";
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}
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if(0)fprint(2, "dir = %s, filename = %s\n",
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dir, filename);
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/*Make full pathname and check filename*/
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pathname = malloc((strlen(dir) + strlen(filename) + 2)*sizeof(char));
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if( file_path(dir, filename, pathname) == -1 ) {
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free(pathname);
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li_err_msg = "Not a LI recognizer classifier file";
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return -1;
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}
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/* Try to short-circuit the full classifier-file processing. */
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rc->file_name = pathname;
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if (lialg_read_classifier_digest(rc) == 0)
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return(0);
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rc->file_name = nil;
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/*Open the file*/
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if( (fd = fopen(pathname,"r")) == nil ) {
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li_err_msg = "Can't open classifier file";
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if(0)fprint(2, "Can't open %s.\n", pathname);
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free(pathname);
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return(-1);
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}
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/*If rClassifier is OK, then delete it first.*/
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if( rc->file_name != nil ) {
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free_rClassifier(rc);
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}
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/*Read classifier.*/
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if( read_classifier(fd,rc) < 0 ) {
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free(pathname);
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return(-1);
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}
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/*Close file.*/
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fclose(fd);
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/*Add classifier name.*/
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rc->file_name = pathname;
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/* Canonicalize examples. */
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if (lialg_canonicalize_examples(rc) != 0) {
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free(pathname);
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rc->file_name = nil;
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return -1;
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}
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return(0);
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}
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/*li_recognizer_save-Save a classifier file.*/
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static int li_recognizer_save(recognizer, char*, char*)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Saving is not supported by the LI recognizer";
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return -1;
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}
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static wordset
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li_recognizer_load_dictionary(recognizer, char*, char*)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Dictionaries are not supported by the LI recognizer";
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return nil;
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}
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static int
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li_recognizer_save_dictionary(recognizer, char*, char*, wordset)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Dictionaries are not supported by the LI recognizer";
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return -1;
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}
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static int
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li_recognizer_free_dictionary(recognizer, wordset)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Dictionaries are not supported by the LI recognizer";
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return -1;
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}
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static int
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li_recognizer_add_to_dictionary(recognizer, letterset*, wordset)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Dictionaries are not supported by the LI recognizer";
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return -1;
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}
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static int
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li_recognizer_delete_from_dictionary(recognizer, letterset*, wordset)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Dictionaries are not supported by the LI recognizer";
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return -1;
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}
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static char*
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li_recognizer_error(recognizer rec)
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{
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char* ret = li_err_msg;
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/*Check for LI recognizer.*/
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if( !CHECK_LI_MAGIC(rec->recognizer_specific) ) {
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li_err_msg = "Not a LI recognizer";
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return nil;
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}
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li_err_msg = nil;
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return ret;
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}
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static int
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li_recognizer_clear(recognizer r, bool)
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{
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li_recognizer* rec;
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rec = (li_recognizer*)r->recognizer_specific;
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/*Check for LI recognizer.*/
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if( !CHECK_LI_MAGIC(rec) ) {
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li_err_msg = "Not a LI recognizer";
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return 0;
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}
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return 0;
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}
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static int
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li_recognizer_set_context(recognizer, rc*)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Contexts are not supported by the LI recognizer";
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return -1;
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}
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static rc*
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li_recognizer_get_context(recognizer)
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{
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/*This operation isn't supported by the LI recognizer.*/
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li_err_msg = "Contexts are not supported by the LI recognizer";
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return nil;
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}
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static int
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li_recognizer_get_buffer(recognizer, uint*, Stroke**)
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{
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/*This operation isn't supported by the LI recognizer.*/
|
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li_err_msg = "Buffer get/set are not supported by the LI recognizer";
|
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return -1;
|
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}
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static int
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li_recognizer_set_buffer(recognizer, uint, Stroke*)
|
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{
|
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/*This operation isn't supported by the LI recognizer.*/
|
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li_err_msg = "Buffer get/set are not supported by the LI recognizer";
|
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return -1;
|
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}
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static int
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li_recognizer_translate(recognizer r, uint ncs, Stroke* tps, bool, int* nret, rec_alternative** ret)
|
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{
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char* clss;
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li_recognizer* rec;
|
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int conf;
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rClassifier* rc;
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rec = (li_recognizer*)r->recognizer_specific;
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*nret = 0;
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*ret = nil;
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/*Check for LI recognizer.*/
|
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|
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if( !CHECK_LI_MAGIC(rec) ) {
|
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li_err_msg = "Not a LI recognizer";
|
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return(-1);
|
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}
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rc = &(rec->li_rc);
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|
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/*Check for valid parameters.*/
|
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if (ncs < 1) {
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li_err_msg = "Invalid parameters: ncs";
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return(-1);
|
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}
|
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if( tps == nil) {
|
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li_err_msg = "Invalid parameters: tps";
|
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return(-1);
|
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}
|
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if( nret == nil) {
|
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li_err_msg = "Invalid parameters: nret";
|
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return(-1);
|
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}
|
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if( ret == nil) {
|
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li_err_msg = "Invalid parameters: ret";
|
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return(-1);
|
|
}
|
|
|
|
/*
|
|
* Go through the stroke array and recognize. Since this is a single
|
|
* stroke recognizer, each stroke is treated as a separate
|
|
* character or gesture. We allow only characters or gestures
|
|
* to be recognized at one time, since otherwise, handling
|
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* the display of segmentation would be difficult.
|
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*/
|
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clss = recognize_internal(rc,tps,&conf);
|
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if (clss == nil) {
|
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*nret = 1;
|
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return(0);
|
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}
|
|
|
|
/*Return values.*/
|
|
*nret = 1;
|
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return(*clss);
|
|
}
|
|
|
|
|
|
static rec_fn*
|
|
li_recognizer_get_extension_functions(recognizer rec)
|
|
{
|
|
rec_fn* ret;
|
|
|
|
/*Check for LI recognizer.*/
|
|
|
|
if( !CHECK_LI_MAGIC(rec->recognizer_specific) ) {
|
|
li_err_msg = "Not a LI recognizer";
|
|
return(nil);
|
|
}
|
|
|
|
ret = make_rec_fn_array(LI_NUM_EX_FNS);
|
|
|
|
/* ari -- clearState & getClasses are mine */
|
|
ret[LI_GET_CLASSES] = (rec_fn)recognizer_getClasses;
|
|
ret[LI_CLEAR] = (rec_fn)recognizer_clearState;
|
|
ret[LI_ISA_LI] = (rec_fn)isa_li;
|
|
ret[LI_TRAIN] = (rec_fn)recognizer_train;
|
|
|
|
return(ret);
|
|
}
|
|
|
|
static char**
|
|
li_recognizer_get_gesture_names(recognizer)
|
|
{
|
|
/*This operation isn't supported by the LI recognizer.*/
|
|
li_err_msg = "Gestures are not supported by the LI recognizer";
|
|
return nil;
|
|
}
|
|
|
|
static xgesture
|
|
li_recognizer_set_gesture_action(recognizer, char*, xgesture, void*)
|
|
{
|
|
/*This operation isn't supported by the LI recognizer.*/
|
|
li_err_msg = "Gestures are not supported by the LI recognizer";
|
|
return nil;
|
|
}
|
|
|
|
/*
|
|
* Exported Functions
|
|
*/
|
|
|
|
/*RECOGNIZER_INITIALIZE-Initialize the recognizer.*/
|
|
|
|
/* note from ari: this expands via pre-processor to
|
|
*
|
|
* recognizer __recognizer_internal_initialize(rec_info* ri)
|
|
*/
|
|
|
|
RECOGNIZER_INITIALIZE(ri)
|
|
{
|
|
recognizer r;
|
|
li_recognizer* rec;
|
|
int i;
|
|
|
|
/*Check that locale matches.*/
|
|
|
|
if( strcmp(ri->ri_locale,LI_SUPPORTED_LOCALE) != 0 ) {
|
|
li_err_msg = "Not a supported locale";
|
|
/* fprint(2, "Locale error.\n");*/
|
|
return(nil);
|
|
}
|
|
|
|
/*
|
|
* Check that character sets match. Note that this is only approximate,
|
|
* since the classifier file will have more information.
|
|
*/
|
|
|
|
if( ri->ri_subset != nil ) {
|
|
for(i = 0; ri->ri_subset[i] != nil; i++ ) {
|
|
|
|
if( strcmp(ri->ri_subset[i],UPPERCASE) != 0 &&
|
|
strcmp(ri->ri_subset[i],LOWERCASE) != 0 &&
|
|
strcmp(ri->ri_subset[i],DIGITS) != 0 &&
|
|
strcmp(ri->ri_subset[i],GESTURE) != 0 ) {
|
|
li_err_msg = "Not a supported character set";
|
|
/* fprint(2, "charset error.\n"); */
|
|
|
|
return(nil);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ari */
|
|
r = make_recognizer(ri);
|
|
/* fprint(2, "past make_recognizer.\n"); */
|
|
|
|
if( r == nil ) {
|
|
li_err_msg = "Can't allocate storage";
|
|
|
|
return(nil);
|
|
}
|
|
|
|
/*Make a LI recognizer structure.*/
|
|
|
|
|
|
/* rec = (li_recognizer*)safe_malloc(sizeof(li_recognizer))) == nil ); */
|
|
|
|
rec = malloc(sizeof(li_recognizer));
|
|
|
|
r->recognizer_specific = rec;
|
|
|
|
rec->li_rc.file_name = nil;
|
|
rec->li_rc.nclasses = 0;
|
|
|
|
/*Initialize the recognizer struct.*/
|
|
|
|
r->recognizer_load_state = li_recognizer_load;
|
|
r->recognizer_save_state = li_recognizer_save;
|
|
r->recognizer_load_dictionary = li_recognizer_load_dictionary;
|
|
r->recognizer_save_dictionary = li_recognizer_save_dictionary;
|
|
r->recognizer_free_dictionary = li_recognizer_free_dictionary;
|
|
r->recognizer_add_to_dictionary = li_recognizer_add_to_dictionary;
|
|
r->recognizer_delete_from_dictionary = li_recognizer_delete_from_dictionary;
|
|
r->recognizer_error = li_recognizer_error;
|
|
r->recognizer_translate = li_recognizer_translate;
|
|
r->recognizer_get_context = li_recognizer_get_context;
|
|
r->recognizer_set_context = li_recognizer_set_context;
|
|
r->recognizer_get_buffer = li_recognizer_get_buffer;
|
|
r->recognizer_set_buffer = li_recognizer_set_buffer;
|
|
r->recognizer_clear = li_recognizer_clear;
|
|
r->recognizer_get_extension_functions =
|
|
li_recognizer_get_extension_functions;
|
|
r->recognizer_get_gesture_names = li_recognizer_get_gesture_names;
|
|
r->recognizer_set_gesture_action =
|
|
li_recognizer_set_gesture_action;
|
|
|
|
/*Initialize LI Magic Number.*/
|
|
|
|
rec->li_magic = LI_MAGIC;
|
|
|
|
/*Initialize rClassifier.*/
|
|
|
|
rec->li_rc.file_name = nil;
|
|
|
|
for( i = 0; i < MAXSCLASSES; i++ ) {
|
|
rec->li_rc.ex[i] = nil;
|
|
rec->li_rc.cnames[i] = nil;
|
|
}
|
|
|
|
lialg_initialize(&rec->li_rc);
|
|
|
|
/*Get rid of error message. Not needed here.*/
|
|
li_err_msg = nil;
|
|
|
|
return(r);
|
|
}
|
|
|
|
/*free_rClassifier-Free the rClassifier.*/
|
|
|
|
static void
|
|
free_rClassifier(rClassifier* rc)
|
|
{
|
|
int i;
|
|
|
|
if( rc->file_name != nil) {
|
|
free(rc->file_name);
|
|
}
|
|
|
|
for( i = 0; rc->ex[i] != nil; i++) {
|
|
delete_examples(rc->ex[i]);
|
|
free(rc->cnames[i]);
|
|
}
|
|
|
|
}
|
|
|
|
/*RECOGNIZER_FINALIZE-Deallocate the recognizer, finalize.*/
|
|
|
|
RECOGNIZER_FINALIZE(r)
|
|
{
|
|
li_recognizer* rec = (li_recognizer*)r->recognizer_specific;
|
|
|
|
/*Make sure this is a li_recognizer first*/
|
|
if( !CHECK_LI_MAGIC(rec) ) {
|
|
li_err_msg = "Not a LI recognizer";
|
|
return(-1);
|
|
}
|
|
|
|
/*Deallocate rClassifier resources.*/
|
|
|
|
free_rClassifier(&(rec->li_rc));
|
|
|
|
/*Deallocate the li_recognizer struct.*/
|
|
free(rec);
|
|
|
|
/*Deallocate the recognizer*/
|
|
delete_recognizer(r);
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
/* **************************************************
|
|
|
|
Implementation of the Li/Yeung recognition algorithm
|
|
|
|
************************************************** */
|
|
|
|
#define WORST_SCORE 0x7fffffff
|
|
|
|
/* Dynamic programming parameters */
|
|
#define DP_BAND 3
|
|
#define MIN_SIM 0
|
|
#define MAX_DIST 0x7fffffff
|
|
#define SIM_THLD 60 /* x 100 */
|
|
#define DIST_THLD 3200 /* x 100 */
|
|
|
|
/* Low-pass filter parameters -- empirically derived */
|
|
#define LP_FILTER_WIDTH 6
|
|
#define LP_FILTER_ITERS 8
|
|
#define LP_FILTER_THLD 250 /* x 100 */
|
|
#define LP_FILTER_MIN 5
|
|
|
|
/* Pseudo-extrema parameters -- empirically derived */
|
|
#define PE_AL_THLD 1500 /* x 100 */
|
|
#define PE_ATCR_THLD 135 /* x 100 */
|
|
|
|
/* Contour-angle derivation parameters */
|
|
#define T_ONE 1
|
|
#define T_TWO 20
|
|
|
|
/* Pre-processing and canonicalization parameters */
|
|
#define CANONICAL_X 108
|
|
#define CANONICAL_Y 128
|
|
#define DIST_SQ_THRESHOLD (3*3) /* copied from fv.h */
|
|
#define NCANONICAL 50
|
|
|
|
/* Tap-handling parameters */
|
|
#define TAP_CHAR "."
|
|
#define TAP_TIME_THLD 150 /* msec */
|
|
#define TAP_DIST_THLD 75 /* dx * dx + dy * dy */
|
|
#define TAP_PATHLEN 1000 /* x 100 */
|
|
|
|
|
|
/* region types */
|
|
#define RGN_CONVEX 0
|
|
#define RGN_CONCAVE 1
|
|
#define RGN_PLAIN 2
|
|
#define RGN_PSEUDO 3
|
|
|
|
|
|
typedef struct RegionList {
|
|
int start;
|
|
int end;
|
|
int type;
|
|
struct RegionList *next;
|
|
} region_list;
|
|
|
|
|
|
/* direction-code table; indexed by dx, dy */
|
|
static int lialg_dctbl[3][3] = {{1, 0, 7}, {2, 0x7FFFFFFF, 6}, {3, 4, 5}};
|
|
|
|
/* low-pass filter weights */
|
|
static int lialg_lpfwts[2 * LP_FILTER_WIDTH + 1];
|
|
static int lialg_lpfconst = -1;
|
|
|
|
|
|
static int lialg_preprocess_stroke(point_list *);
|
|
static point_list *lialg_compute_dominant_points(point_list *);
|
|
static point_list *lialg_interpolate_points(point_list *);
|
|
static void lialg_bresline(pen_point *, pen_point *, point_list *, int *);
|
|
static void lialg_compute_chain_code(point_list *);
|
|
static void lialg_compute_unit_chain_code(point_list *);
|
|
static region_list *lialg_compute_regions(point_list *);
|
|
static point_list *lialg_compute_dompts(point_list *, region_list *);
|
|
static int *lialg_compute_contour_angle_set(point_list *, region_list *);
|
|
static void lialg_score_stroke(point_list *, point_list *, int *, int *);
|
|
static int lialg_compute_similarity(point_list *, point_list *);
|
|
static int lialg_compute_distance(point_list *, point_list *);
|
|
|
|
static int lialg_read_classifier_digest(rClassifier *);
|
|
|
|
static int lialg_canonicalize_examples(rClassifier *);
|
|
static int lialg_canonicalize_example_stroke(point_list *);
|
|
static int lialg_compute_equipoints(point_list *);
|
|
|
|
static int lialg_compute_pathlen(point_list *);
|
|
static int lialg_compute_pathlen_subset(point_list *, int, int);
|
|
static int lialg_filter_points(point_list *);
|
|
static int lialg_translate_points(point_list *, int, int, int, int);
|
|
static void lialg_get_bounding_box(point_list *, int *, int *, int *, int *);
|
|
static void lialg_compute_lpf_parameters();
|
|
static int isqrt(int);
|
|
static int likeatan(int, int);
|
|
static int quadr(int);
|
|
|
|
|
|
/*************************************************************
|
|
|
|
Core routines for the Li/Yeung recognition algorithm
|
|
|
|
*************************************************************/
|
|
|
|
static void lialg_initialize(rClassifier *rec) {
|
|
int i;
|
|
|
|
/* Initialize the dompts arrays. */
|
|
for (i = 0; i < MAXSCLASSES; i++) {
|
|
rec->dompts[i] = nil;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Main recognition routine -- called by HRE API.
|
|
*/
|
|
static char *lialg_recognize_stroke(rClassifier *rec, point_list *stroke) {
|
|
int i;
|
|
char *name = nil;
|
|
point_list *input_dompts = nil;
|
|
char *best_name = nil;
|
|
int best_score = WORST_SCORE;
|
|
char *curr_name;
|
|
point_list *curr_dompts;
|
|
|
|
/* (void)gettimeofday(&stv, nil);*/
|
|
|
|
if (stroke->npts < 1) goto done;
|
|
|
|
/* Check for tap. */
|
|
|
|
/* First thing is to filter out ``close points.'' */
|
|
if (lialg_filter_points(stroke) != 0) return(nil);
|
|
|
|
/* Unfortunately, we don't have the actual time that each point */
|
|
/* was recorded (i.e., dt is invalid). Hence, we have to use a */
|
|
/* heuristic based on total distance and the number of points. */
|
|
if (stroke->npts == 1 || lialg_compute_pathlen(stroke) < TAP_PATHLEN)
|
|
return(TAP_CHAR);
|
|
|
|
/* Pre-process input stroke. */
|
|
if (lialg_preprocess_stroke(stroke) != 0) goto done;
|
|
|
|
/* Compute its dominant points. */
|
|
input_dompts = lialg_compute_dominant_points(stroke);
|
|
if (input_dompts == nil) goto done;
|
|
|
|
/* Score input stroke against every class in classifier. */
|
|
for (i = 0, curr_name = rec->cnames[i], curr_dompts = rec->dompts[i];
|
|
i < MAXSCLASSES && curr_name != nil && curr_dompts != nil;
|
|
i++, curr_name = rec->cnames[i], curr_dompts = rec->dompts[i]) {
|
|
int sim;
|
|
int dist;
|
|
int curr_score;
|
|
|
|
lialg_score_stroke(input_dompts, curr_dompts, &sim, &dist);
|
|
curr_score = dist;
|
|
|
|
if (lidebug && curr_score < DIST_THLD)
|
|
fprint(2, "(%s, %d, %d) ", curr_name, sim, dist);
|
|
|
|
/* Is it the best so far? */
|
|
if (curr_score < best_score && curr_score <= DIST_THLD) {
|
|
best_score = curr_score;
|
|
best_name = curr_name;
|
|
}
|
|
}
|
|
|
|
if (lidebug)
|
|
fprint(2, "\n");
|
|
|
|
/* No errors. */
|
|
name = best_name;
|
|
|
|
done:
|
|
delete_examples(input_dompts);
|
|
return(name);
|
|
}
|
|
|
|
|
|
static int lialg_preprocess_stroke(point_list *points) {
|
|
int minx, miny, maxx, maxy, xrange, yrange, scale, xoff, yoff;
|
|
|
|
/* Filter out points that are too close. */
|
|
/* We did this earlier, when we checked for a tap. */
|
|
/*
|
|
if (lialg_filter_points(points) != 0) return(-1);
|
|
*/
|
|
|
|
/* assert(points->npts > 0);*/
|
|
|
|
/* Scale up to avoid conversion errors. */
|
|
lialg_get_bounding_box(points, &minx, &miny, &maxx, &maxy);
|
|
xrange = maxx - minx;
|
|
yrange = maxy - miny;
|
|
scale = ( ((100 * xrange + CANONICAL_X / 2) / CANONICAL_X) >
|
|
((100 * yrange + CANONICAL_Y / 2) / CANONICAL_Y))
|
|
? (100 * CANONICAL_X + xrange / 2) / xrange
|
|
: (100 * CANONICAL_Y + yrange / 2) / yrange;
|
|
if (lialg_translate_points(points, minx, miny, scale, scale) != 0)
|
|
return(-1);
|
|
|
|
/* Center the stroke. */
|
|
lialg_get_bounding_box(points, &minx, &miny, &maxx, &maxy);
|
|
xrange = maxx - minx;
|
|
yrange = maxy - miny;
|
|
xoff = -((CANONICAL_X - xrange + 1) / 2);
|
|
yoff = -((CANONICAL_Y - yrange + 1) / 2);
|
|
if (lialg_translate_points(points, xoff, yoff, 100, 100) != 0) return(-1);
|
|
|
|
/* Store the x and y ranges in the point list. */
|
|
xrange = maxx - minx;
|
|
yrange = maxy - miny;
|
|
points->xrange = xrange;
|
|
points->yrange = yrange;
|
|
|
|
if (lidebug) {
|
|
int i;
|
|
fprint(2, "After pre-processing: %d %d %d %d\n",
|
|
minx, miny, maxx, maxy);
|
|
for (i = 0; i < points->npts; i++)
|
|
fprint(2, " (%P)\n", points->pts[i].Point);
|
|
fflush(stderr);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
static point_list *lialg_compute_dominant_points(point_list *points) {
|
|
point_list *ipts;
|
|
region_list *regions;
|
|
point_list *dpts;
|
|
|
|
/* Interpolate points. */
|
|
ipts = lialg_interpolate_points(points);
|
|
if (ipts == nil) return(nil);
|
|
if (lidebug) {
|
|
int j;
|
|
fprint(2, "After interpolation: %d ipts\n", ipts->npts);
|
|
for (j = 0; j < ipts->npts; j++) {
|
|
fprint(2, " (%P), %lud\n", ipts->pts[j].Point, ipts->pts[j].chaincode);
|
|
}
|
|
fflush(stderr);
|
|
}
|
|
|
|
/* Compute regions. */
|
|
regions = lialg_compute_regions(ipts);
|
|
/* assert(regions != nil);*/
|
|
|
|
/* Compute dominant points. */
|
|
dpts = lialg_compute_dompts(ipts, regions);
|
|
if (lidebug) {
|
|
int j;
|
|
fprint(2, "Dominant points: ");
|
|
for (j = 0; j < dpts->npts; j++) {
|
|
fprint(2, "%P (%lud) ", dpts->pts[j].Point, dpts->pts[j].chaincode);
|
|
}
|
|
fprint(2, "\n");
|
|
fflush(stderr);
|
|
}
|
|
|
|
/* Delete region data structure. */
|
|
{
|
|
region_list *curr, *next;
|
|
for (curr = regions; curr != nil; ) {
|
|
next = curr->next;
|
|
free(curr);
|
|
curr = next;
|
|
}
|
|
}
|
|
delete_examples(ipts);
|
|
return(dpts);
|
|
}
|
|
|
|
/* Input points are assumed to be integer-valued! */
|
|
static point_list *lialg_interpolate_points(point_list *points) {
|
|
int i, j;
|
|
int maxpts;
|
|
point_list *newpts;
|
|
|
|
/* Compute an upper-bound on the number of interpolated points. */
|
|
maxpts = 0;
|
|
for (i = 0; i < (points->npts - 1); i++) {
|
|
pen_point *pta = &(points->pts[i]);
|
|
pen_point *ptb = &(points->pts[i+1]);
|
|
maxpts += abs(pta->x - ptb->x) + abs(pta->y - ptb->y);
|
|
}
|
|
|
|
/* Allocate an array of the requisite size. */
|
|
maxpts += points->npts;
|
|
/* newpts = (point_list *)safe_malloc(sizeof(point_list)); */
|
|
newpts = malloc(sizeof(point_list));
|
|
newpts->pts = mallocz(maxpts*sizeof(pen_point), 1);
|
|
if (newpts->pts == nil) {
|
|
free(newpts);
|
|
return(nil);
|
|
}
|
|
newpts->npts = maxpts;
|
|
newpts->next = nil;
|
|
|
|
/* Interpolate each of the segments. */
|
|
j = 0;
|
|
for (i = 0; i < (points->npts - 1); i++) {
|
|
pen_point *startpt = &(points->pts[i]);
|
|
pen_point *endpt = &(points->pts[i+1]);
|
|
|
|
lialg_bresline(startpt, endpt, newpts, &j);
|
|
|
|
j--; /* end point gets recorded as start point of next segment! */
|
|
}
|
|
|
|
/* Add-in last point. */
|
|
newpts->pts[j++] = points->pts[points->npts - 1];
|
|
newpts->npts = j;
|
|
|
|
/* Compute the chain code for P (the list of points). */
|
|
lialg_compute_unit_chain_code(newpts);
|
|
|
|
return(newpts);
|
|
}
|
|
|
|
|
|
/* This implementation is due to Kenny Hoff. */
|
|
static void lialg_bresline(pen_point *startpt, pen_point *endpt,
|
|
point_list *newpts, int *j) {
|
|
int Ax, Ay, Bx, By, dX, dY, Xincr, Yincr;
|
|
|
|
Ax = startpt->x;
|
|
Ay = startpt->y;
|
|
Bx = endpt->x;
|
|
By = endpt->y;
|
|
|
|
/* INITIALIZE THE COMPONENTS OF THE ALGORITHM THAT ARE NOT AFFECTED */
|
|
/* BY THE SLOPE OR DIRECTION OF THE LINE */
|
|
dX = abs(Bx-Ax); /* store the change in X and Y of the line endpoints */
|
|
dY = abs(By-Ay);
|
|
|
|
/* DETERMINE "DIRECTIONS" TO INCREMENT X AND Y (REGARDLESS OF DECISION) */
|
|
if (Ax > Bx) { Xincr=-1; } else { Xincr=1; } /* which direction in X? */
|
|
if (Ay > By) { Yincr=-1; } else { Yincr=1; } /* which direction in Y? */
|
|
|
|
/* DETERMINE INDEPENDENT VARIABLE (ONE THAT ALWAYS INCREMENTS BY 1 (OR -1) ) */
|
|
/* AND INITIATE APPROPRIATE LINE DRAWING ROUTINE (BASED ON FIRST OCTANT */
|
|
/* ALWAYS). THE X AND Y'S MAY BE FLIPPED IF Y IS THE INDEPENDENT VARIABLE. */
|
|
if (dX >= dY) { /* if X is the independent variable */
|
|
int dPr = dY<<1; /* amount to increment decision if right is chosen (always) */
|
|
int dPru = dPr - (dX<<1); /* amount to increment decision if up is chosen */
|
|
int P = dPr - dX; /* decision variable start value */
|
|
|
|
/* process each point in the line one at a time (just use dX) */
|
|
for (; dX>=0; dX--) {
|
|
newpts->pts[*j].x = Ax;
|
|
newpts->pts[*j].y = Ay;
|
|
(*j)++;
|
|
|
|
if (P > 0) { /* is the pixel going right AND up? */
|
|
Ax+=Xincr; /* increment independent variable */
|
|
Ay+=Yincr; /* increment dependent variable */
|
|
P+=dPru; /* increment decision (for up) */
|
|
} else { /* is the pixel just going right? */
|
|
Ax+=Xincr; /* increment independent variable */
|
|
P+=dPr; /* increment decision (for right) */
|
|
}
|
|
}
|
|
} else { /* if Y is the independent variable */
|
|
int dPr = dX<<1; /* amount to increment decision if right is chosen (always) */
|
|
int dPru = dPr - (dY<<1); /* amount to increment decision if up is chosen */
|
|
int P = dPr - dY; /* decision variable start value */
|
|
|
|
/* process each point in the line one at a time (just use dY) */
|
|
for (; dY>=0; dY--) {
|
|
newpts->pts[*j].x = Ax;
|
|
newpts->pts[*j].y = Ay;
|
|
(*j)++;
|
|
|
|
if (P > 0) { /* is the pixel going up AND right? */
|
|
Ax+=Xincr; /* increment dependent variable */
|
|
Ay+=Yincr; /* increment independent variable */
|
|
P+=dPru; /* increment decision (for up) */
|
|
} else { /* is the pixel just going up? */
|
|
Ay+=Yincr; /* increment independent variable */
|
|
P+=dPr; /* increment decision (for right) */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void lialg_compute_chain_code(point_list *pts) {
|
|
int i;
|
|
|
|
for (i = 0; i < (pts->npts - 1); i++) {
|
|
pen_point *startpt = &(pts->pts[i]);
|
|
pen_point *endpt = &(pts->pts[i+1]);
|
|
int dx = endpt->x - startpt->x;
|
|
int dy = endpt->y - startpt->y;
|
|
int tmp = quadr(likeatan(dy, dx));
|
|
int dircode = (12 - tmp) % 8;
|
|
|
|
startpt->chaincode = dircode;
|
|
}
|
|
}
|
|
|
|
|
|
static void lialg_compute_unit_chain_code(point_list *pts) {
|
|
int i;
|
|
|
|
for (i = 0; i < (pts->npts - 1); i++) {
|
|
pen_point *startpt = &(pts->pts[i]);
|
|
pen_point *endpt = &(pts->pts[i+1]);
|
|
int dx = endpt->x - startpt->x;
|
|
int dy = endpt->y - startpt->y;
|
|
int dircode = lialg_dctbl[dx+1][dy+1];
|
|
|
|
startpt->chaincode = dircode;
|
|
}
|
|
}
|
|
|
|
|
|
static region_list *lialg_compute_regions(point_list *pts) {
|
|
region_list *regions;
|
|
region_list *curr_reg;
|
|
int *R[2 + LP_FILTER_ITERS];
|
|
int *junk;
|
|
int *curr, *next;
|
|
int i, j;
|
|
|
|
/* Initialize low-pass filter parameters if necessary. */
|
|
if (lialg_lpfconst == -1)
|
|
lialg_compute_lpf_parameters();
|
|
|
|
/* Allocate a 2 x pts->npts array for use in computing the (filtered) Angle set, A_n. */
|
|
junk = malloc((2 + LP_FILTER_ITERS) * pts->npts*sizeof(int));
|
|
for (i = 0; i < (2 + LP_FILTER_ITERS); i++)
|
|
R[i] = junk + (i * pts->npts);
|
|
curr = R[0];
|
|
|
|
/* Compute the Angle set, A, in the first element of array R. */
|
|
/* Values in R are in degrees, x 100. */
|
|
curr[0] = 18000; /* a_0 */
|
|
for (i = 1; i < (pts->npts - 1); i++) {
|
|
int d_i = pts->pts[i].chaincode;
|
|
int d_iminusone = pts->pts[i-1].chaincode;
|
|
int a_i;
|
|
|
|
if (d_iminusone < d_i)
|
|
d_iminusone += 8;
|
|
|
|
a_i = (d_iminusone - d_i) % 8;
|
|
|
|
/* convert to degrees, x 100 */
|
|
curr[i] = ((12 - a_i) % 8) * 45 * 100;
|
|
}
|
|
curr[pts->npts - 1] = 18000; /* a_L-1 */
|
|
|
|
/* Perform a number of filtering iterations. */
|
|
next = R[1];
|
|
for (j = 0; j < LP_FILTER_ITERS; j++, curr = R[j], next = R[j+1]) {
|
|
for (i = 0; i < pts->npts; i++) {
|
|
int k;
|
|
|
|
next[i] = 0;
|
|
|
|
for (k = i - LP_FILTER_WIDTH; k <= i + LP_FILTER_WIDTH; k++) {
|
|
int oldval = (k < 0 || k >= pts->npts) ? 18000 : curr[k];
|
|
next[i] += oldval * lialg_lpfwts[k - (i - LP_FILTER_WIDTH)]; /* overflow? */
|
|
}
|
|
|
|
next[i] /= lialg_lpfconst;
|
|
}
|
|
}
|
|
|
|
/* Do final thresholding around PI. */
|
|
/* curr and next are set-up correctly at end of previous loop! */
|
|
for (i = 0; i < pts->npts; i++)
|
|
next[i] = (abs(curr[i] - 18000) < LP_FILTER_THLD) ? 18000 : curr[i];
|
|
curr = next;
|
|
|
|
/* Debugging. */
|
|
if (lidebug > 1) {
|
|
for (i = 0; i < pts->npts; i++) {
|
|
fprint(2, "%3d: (%P) %lud ",
|
|
i, pts->pts[i].Point, pts->pts[i].chaincode);
|
|
for (j = 0; j < 2 + LP_FILTER_ITERS; j++)
|
|
fprint(2, "%d ", R[j][i]);
|
|
fprint(2, "\n");
|
|
}
|
|
}
|
|
|
|
/* Do the region segmentation. */
|
|
{
|
|
int start, end;
|
|
int currtype;
|
|
|
|
#define RGN_TYPE(val) (((val)==18000)?RGN_PLAIN:((val)<18000?RGN_CONCAVE:RGN_CONVEX))
|
|
|
|
start = 0;
|
|
currtype = RGN_TYPE(curr[0]);
|
|
regions = malloc(sizeof(region_list));
|
|
curr_reg = regions;
|
|
curr_reg->start = start;
|
|
curr_reg->end = 0;
|
|
curr_reg->type = currtype;
|
|
curr_reg->next = nil;
|
|
for (i = 1; i < pts->npts; i++) {
|
|
int nexttype = RGN_TYPE(curr[i]);
|
|
|
|
if (nexttype != currtype) {
|
|
region_list *next_reg;
|
|
|
|
end = i - 1;
|
|
curr_reg->end = end;
|
|
if (lidebug > 1)
|
|
fprint(2, " (%d, %d), %d\n", start, end, currtype);
|
|
|
|
start = i;
|
|
currtype = nexttype;
|
|
next_reg = malloc(sizeof(region_list));
|
|
next_reg->start = start;
|
|
next_reg->end = 0;
|
|
next_reg->type = nexttype;
|
|
next_reg->next = nil;
|
|
|
|
curr_reg->next = next_reg;
|
|
curr_reg = next_reg;
|
|
}
|
|
}
|
|
end = i - 1;
|
|
curr_reg->end = end;
|
|
if (lidebug > 1)
|
|
fprint(2, " (%d, %d), %d\n", start, end, currtype);
|
|
|
|
/* Filter out convex/concave regions that are too short. */
|
|
for (curr_reg = regions; curr_reg; curr_reg = curr_reg->next)
|
|
if (curr_reg->type == RGN_PLAIN) {
|
|
region_list *next_reg;
|
|
|
|
for (next_reg = curr_reg->next;
|
|
next_reg != nil &&
|
|
(next_reg->end - next_reg->start) < LP_FILTER_MIN;
|
|
next_reg = curr_reg->next) {
|
|
/* next_reg must not be plain, and it must be followed by a plain */
|
|
/* assert(next_reg->type != RGN_PLAIN); */
|
|
/* assert(next_reg->next != nil && (next_reg->next)->type == RGN_PLAIN); */
|
|
|
|
curr_reg->next = (next_reg->next)->next;
|
|
curr_reg->end = (next_reg->next)->end;
|
|
|
|
free(next_reg->next);
|
|
free(next_reg);
|
|
}
|
|
}
|
|
|
|
/* Add-in pseudo-extremes. */
|
|
{
|
|
region_list *tmp, *prev_reg;
|
|
|
|
tmp = regions;
|
|
regions = nil;
|
|
prev_reg = nil;
|
|
for (curr_reg = tmp; curr_reg; curr_reg = curr_reg->next) {
|
|
if (curr_reg->type == RGN_PLAIN) {
|
|
int arclen = lialg_compute_pathlen_subset(pts,
|
|
curr_reg->start,
|
|
curr_reg->end);
|
|
int dx = pts->pts[curr_reg->end].x -
|
|
pts->pts[curr_reg->start].x;
|
|
int dy = pts->pts[curr_reg->end].y -
|
|
pts->pts[curr_reg->start].y;
|
|
int chordlen = isqrt(10000 * (dx * dx + dy * dy));
|
|
int atcr = (chordlen == 0) ? 0 : (100 * arclen + chordlen / 2) / chordlen;
|
|
|
|
if (lidebug)
|
|
fprint(2, "%d, %d, %d\n", arclen, chordlen, atcr);
|
|
|
|
/* Split region if necessary. */
|
|
if (arclen >= PE_AL_THLD && atcr >= PE_ATCR_THLD) {
|
|
int mid = curr_reg->start + (curr_reg->end - curr_reg->start) / 2;
|
|
int end = curr_reg->end;
|
|
region_list *saved_next = curr_reg->next;
|
|
|
|
curr_reg->end = mid - 1;
|
|
if (prev_reg == nil)
|
|
regions = curr_reg;
|
|
else
|
|
prev_reg->next = curr_reg;
|
|
prev_reg = curr_reg;
|
|
|
|
/* curr_reg = (region_list *)safe_malloc(sizeof(region_list));*/
|
|
curr_reg = malloc(sizeof(region_list));
|
|
curr_reg->start = mid;
|
|
curr_reg->end = mid;
|
|
curr_reg->type = RGN_PSEUDO;
|
|
curr_reg->next = nil;
|
|
prev_reg->next = curr_reg;
|
|
prev_reg = curr_reg;
|
|
|
|
/* curr_reg = (region_list *)malloc(sizeof(region_list)); */
|
|
curr_reg = malloc(sizeof(region_list));
|
|
curr_reg->start = mid + 1;
|
|
curr_reg->end = end;
|
|
curr_reg->type = RGN_PLAIN;
|
|
curr_reg->next = nil;
|
|
prev_reg->next = curr_reg;
|
|
prev_reg = curr_reg;
|
|
|
|
curr_reg->next = saved_next;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (prev_reg == nil)
|
|
regions = curr_reg;
|
|
else
|
|
prev_reg->next = curr_reg;
|
|
prev_reg = curr_reg;
|
|
}
|
|
}
|
|
}
|
|
|
|
free(junk);
|
|
return(regions);
|
|
}
|
|
|
|
|
|
static point_list *lialg_compute_dompts(point_list *pts, region_list *regions) {
|
|
point_list *dpts;
|
|
int ndpts;
|
|
int *cas;
|
|
int nonplain;
|
|
region_list *r;
|
|
region_list *curr;
|
|
int dp;
|
|
int previx;
|
|
int currix;
|
|
|
|
/* Compute contour angle set. */
|
|
cas = lialg_compute_contour_angle_set(pts, regions);
|
|
|
|
/* Dominant points include: start_pt, end_pt, extrema_of_non_plain_regions, midpts of the preceding. */
|
|
nonplain = 0;
|
|
for (r = regions; r != nil; r = r->next)
|
|
if (r->type != RGN_PLAIN)
|
|
nonplain++;
|
|
ndpts = 2 * (2 + nonplain) - 1;
|
|
/* dpts = (point_list *)safe_malloc(sizeof(point_list)); */
|
|
dpts = malloc(sizeof(point_list));
|
|
dpts->pts = mallocz(ndpts*sizeof(pen_point), 1);
|
|
if (dpts->pts == nil) {
|
|
free(dpts);
|
|
return(nil);
|
|
}
|
|
dpts->npts = ndpts;
|
|
dpts->next = nil;
|
|
|
|
/* Pick out dominant points. */
|
|
|
|
/* Record start point. */
|
|
dp = 0;
|
|
previx = 0;
|
|
dpts->pts[dp++] = pts->pts[previx];
|
|
|
|
for (curr = regions; curr != nil; curr = curr->next)
|
|
if (curr->type != RGN_PLAIN) {
|
|
int max_v = 0;
|
|
int min_v = 0x7fffffff; /* maxint */
|
|
int max_ix = -1;
|
|
int min_ix = -1;
|
|
int i;
|
|
|
|
for (i = curr->start; i <= curr->end; i++) {
|
|
int v = cas[i];
|
|
if (v > max_v) { max_v = v; max_ix = i; }
|
|
if (v < min_v) { min_v = v; min_ix = i; }
|
|
if (lidebug > 1)
|
|
fprint(2, " %d\n", v);
|
|
}
|
|
|
|
currix = (curr->type == RGN_CONVEX ? max_ix : min_ix);
|
|
|
|
/* Record midpoint. */
|
|
dpts->pts[dp++] = pts->pts[previx + (currix - previx) / 2];
|
|
|
|
/* Record extreme point. */
|
|
dpts->pts[dp++] = pts->pts[currix];
|
|
|
|
previx = currix;
|
|
}
|
|
|
|
/* Record last mid-point and end point. */
|
|
currix = pts->npts - 1;
|
|
dpts->pts[dp++] = pts->pts[previx + (currix - previx) / 2];
|
|
dpts->pts[dp] = pts->pts[currix];
|
|
|
|
/* Compute chain-code. */
|
|
lialg_compute_chain_code(dpts);
|
|
|
|
free(cas);
|
|
return(dpts);
|
|
}
|
|
|
|
|
|
static int *lialg_compute_contour_angle_set(point_list *pts,
|
|
region_list *regions) {
|
|
int *V;
|
|
region_list *curr_reg;
|
|
int i;
|
|
|
|
V = malloc(pts->npts*sizeof(int));
|
|
|
|
V[0] = 18000;
|
|
for (curr_reg = regions; curr_reg != nil; curr_reg = curr_reg->next) {
|
|
for (i = curr_reg->start; i <= curr_reg->end; i++) {
|
|
if (curr_reg->type == RGN_PLAIN) {
|
|
V[i] = 18000;
|
|
} else {
|
|
/* For now, simply choose the mid-point. */
|
|
int isMidPt = i == (curr_reg->start +
|
|
(curr_reg->end - curr_reg->start) / 2);
|
|
V[i] = (curr_reg->type == RGN_CONVEX)
|
|
? (isMidPt ? 18000 : 0)
|
|
: (isMidPt ? 0 : 18000);
|
|
}
|
|
}
|
|
}
|
|
V[pts->npts - 1] = 18000;
|
|
|
|
return(V);
|
|
}
|
|
|
|
|
|
/*
|
|
* First compute the similarity between the two strings.
|
|
* If it's above a threshold, compute the distance between
|
|
* the two and return it as the ``score.''
|
|
* Otherwise, return the constant WORST_SCORE.
|
|
*
|
|
*/
|
|
static void lialg_score_stroke(point_list *input_dompts, point_list *curr_dompts, int *sim, int *dist) {
|
|
*sim = MIN_SIM;
|
|
*dist = MAX_DIST;
|
|
|
|
*sim = lialg_compute_similarity(input_dompts, curr_dompts);
|
|
if (*sim < SIM_THLD) goto done;
|
|
|
|
*dist = lialg_compute_distance(input_dompts, curr_dompts);
|
|
|
|
done:
|
|
if (lidebug)
|
|
fprint(2, "%d, %d\n", *sim, *dist);
|
|
}
|
|
|
|
|
|
static int lialg_compute_similarity(point_list *input_dompts, point_list *curr_dompts) {
|
|
int sim;
|
|
point_list *A, *B;
|
|
int N, M;
|
|
int **G;
|
|
int *junk;
|
|
int i, j;
|
|
|
|
/* A is the longer sequence, length N. */
|
|
/* B is the shorter sequence, length M. */
|
|
if (input_dompts->npts >= curr_dompts->npts) {
|
|
A = input_dompts;
|
|
N = input_dompts->npts;
|
|
B = curr_dompts;
|
|
M = curr_dompts->npts;
|
|
} else {
|
|
A = curr_dompts;
|
|
N = curr_dompts->npts;
|
|
B = input_dompts;
|
|
M = input_dompts->npts;
|
|
}
|
|
|
|
/* Allocate and initialize the Gain matrix, G. */
|
|
/* The size of G is M x (N + 1). */
|
|
/* Note that row 0 is unused. */
|
|
/* Similarities are x 10. */
|
|
G = malloc(M*sizeof(int *));
|
|
junk = malloc(M * (N + 1) * sizeof(int));
|
|
for (i = 0; i < M; i++)
|
|
G[i] = junk + (i * (N + 1));
|
|
|
|
for (i = 1; i < M; i++) {
|
|
int bval = B->pts[i-1].chaincode;
|
|
|
|
/* Source column. */
|
|
G[i][0] = 0;
|
|
|
|
for (j = 1; j < N; j++) {
|
|
int aval = A->pts[j-1].chaincode;
|
|
int diff = abs(bval - aval);
|
|
if (diff > 4) diff = 8 - diff;
|
|
|
|
G[i][j] = (diff == 0)
|
|
? 10
|
|
: (diff == 1)
|
|
? 6
|
|
: 0;
|
|
}
|
|
|
|
/* Sink column. */
|
|
G[i][N] = 0;
|
|
}
|
|
|
|
/* Do the DP algorithm. */
|
|
/* Proceed in column order, from highest column to the lowest. */
|
|
/* Within each column, proceed from the highest row to the lowest. */
|
|
/* Skip the highest column. */
|
|
for (j = N - 1; j >= 0; j--)
|
|
for (i = M - 1; i > 0; i--) {
|
|
int max = G[i][j + 1];
|
|
|
|
if (i < (M - 1)) {
|
|
int tmp = G[i + 1][j + 1];
|
|
if (tmp > max) max = tmp;
|
|
}
|
|
|
|
G[i][j] += max;
|
|
}
|
|
|
|
sim = (10 * G[1][0] + (N - 1) / 2) / (N - 1);
|
|
|
|
if (G != nil)
|
|
free(G);
|
|
if (junk != nil)
|
|
free(junk);
|
|
return(sim);
|
|
}
|
|
|
|
|
|
static int lialg_compute_distance(point_list *input_dompts,
|
|
point_list *curr_dompts) {
|
|
int dist;
|
|
point_list *A, *B;
|
|
int N, M;
|
|
int **C;
|
|
int *junk;
|
|
int *BE;
|
|
int *TE;
|
|
int i, j;
|
|
|
|
/* A is the longer sequence, length N. */
|
|
/* B is the shorter sequence, length M. */
|
|
if (input_dompts->npts >= curr_dompts->npts) {
|
|
A = input_dompts;
|
|
N = input_dompts->npts;
|
|
B = curr_dompts;
|
|
M = curr_dompts->npts;
|
|
}
|
|
else {
|
|
A = curr_dompts;
|
|
N = curr_dompts->npts;
|
|
B = input_dompts;
|
|
M = input_dompts->npts;
|
|
}
|
|
|
|
/* Construct the helper vectors, BE and TE, which say for each column */
|
|
/* what are the ``bottom'' and ``top'' rows of interest. */
|
|
BE = malloc((N + 1)*sizeof(int));
|
|
TE = malloc((N + 1)*sizeof(int));
|
|
|
|
for (j = 1; j <= N; j++) {
|
|
int bot, top;
|
|
|
|
bot = j + (M - DP_BAND);
|
|
if (bot > M) bot = M;
|
|
BE[j] = bot;
|
|
|
|
top = j - (N - DP_BAND);
|
|
if (top < 1) top = 1;
|
|
TE[j] = top;
|
|
}
|
|
|
|
/* Allocate and initialize the Cost matrix, C. */
|
|
/* The size of C is (M + 1) x (N + 1). */
|
|
/* Note that row and column 0 are unused. */
|
|
/* Costs are x 100. */
|
|
/* C = (int **)safe_malloc((M + 1) * sizeof(int *)); */
|
|
C = malloc((M + 1)*sizeof( int *));
|
|
junk = malloc((M + 1) * (N + 1)*sizeof(int));
|
|
for (i = 0; i <= M; i++)
|
|
C[i] = junk + (i * (N + 1));
|
|
|
|
for (i = 1; i <= M; i++) {
|
|
int bx = B->pts[i-1].x;
|
|
int by = B->pts[i-1].y;
|
|
|
|
for (j = 1; j <= N; j++) {
|
|
int ax = A->pts[j-1].x;
|
|
int ay = A->pts[j-1].y;
|
|
int dx = bx - ax;
|
|
int dy = by - ay;
|
|
int dist = isqrt(10000 * (dx * dx + dy * dy));
|
|
|
|
C[i][j] = dist;
|
|
}
|
|
}
|
|
|
|
/* Do the DP algorithm. */
|
|
/* Proceed in column order, from highest column to the lowest. */
|
|
/* Within each column, proceed from the highest row to the lowest. */
|
|
for (j = N; j > 0; j--)
|
|
for (i = M; i > 0; i--) {
|
|
int min = MAX_DIST;
|
|
|
|
if (i > BE[j] || i < TE[j] || (j == N && i == M))
|
|
continue;
|
|
|
|
if (j < N) {
|
|
if (i >= TE[j+1]) {
|
|
int tmp = C[i][j+1];
|
|
if (tmp < min)
|
|
min = tmp;
|
|
}
|
|
|
|
if (i < M) {
|
|
int tmp = C[i+1][j+1];
|
|
if (tmp < min)
|
|
min = tmp;
|
|
}
|
|
}
|
|
|
|
if (i < BE[j]) {
|
|
int tmp = C[i+1][j];
|
|
if (tmp < min) min = tmp;
|
|
}
|
|
|
|
C[i][j] += min;
|
|
}
|
|
|
|
dist = (C[1][1] + N / 2) / N;
|
|
|
|
if (C != nil) free(C);
|
|
if (junk != nil) free(junk);
|
|
if (BE != nil) free(BE);
|
|
if (TE != nil) free(TE);
|
|
return(dist);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
|
|
Digest-processing routines
|
|
|
|
*************************************************************/
|
|
|
|
static int lialg_read_classifier_digest(rClassifier *rec) {
|
|
int nclasses;
|
|
FILE *fp;
|
|
|
|
/* Try to open the corresponding digest file. */
|
|
{
|
|
char *clx_path;
|
|
char *dot;
|
|
|
|
/* Get a copy of the filename, with some room on the end. */
|
|
/* clx_path = safe_malloc(strlen(rec->file_name) + 5); */
|
|
clx_path = malloc((strlen(rec->file_name) + 5) *sizeof(char));
|
|
strcpy(clx_path, rec->file_name);
|
|
|
|
/* Truncate the path after the last dot. */
|
|
dot = strrchr(clx_path, '.');
|
|
if (dot == nil) { free(clx_path); return(-1); }
|
|
*(dot + 1) = 0;
|
|
|
|
/* Append the classifier-digest extension. */
|
|
strcat(clx_path, "clx");
|
|
|
|
fp = fopen(clx_path, "r");
|
|
if (fp == nil) {
|
|
free(clx_path);
|
|
return(-1);
|
|
}
|
|
|
|
free(clx_path);
|
|
}
|
|
|
|
/* Read-in the name and dominant points for each class. */
|
|
for (nclasses = 0; !feof(fp); nclasses++) {
|
|
point_list *dpts = nil;
|
|
char class[BUFSIZ];
|
|
int npts;
|
|
int j;
|
|
|
|
if (fscanf(fp, "%s %d", class, &npts) != 2) {
|
|
if (feof(fp)) break;
|
|
|
|
goto failed;
|
|
}
|
|
rec->cnames[nclasses] = strdup(class);
|
|
|
|
/* Allocate a dominant-points list. */
|
|
/* dpts = (point_list *)safe_malloc(sizeof(point_list)); */
|
|
dpts = malloc(sizeof(point_list));
|
|
dpts->pts = mallocz(npts*sizeof(pen_point), 1);
|
|
if (dpts->pts == nil) goto failed;
|
|
dpts->npts = npts;
|
|
dpts->next = nil;
|
|
|
|
/* Read in each point. */
|
|
for (j = 0; j < npts; j++) {
|
|
int x, y;
|
|
|
|
if (fscanf(fp, "%d %d", &x, &y) != 2) goto failed;
|
|
dpts->pts[j].x = x;
|
|
dpts->pts[j].y = y;
|
|
}
|
|
|
|
/* Compute the chain-code. */
|
|
lialg_compute_chain_code(dpts);
|
|
|
|
/* Store the list in the rec data structure. */
|
|
rec->dompts[nclasses] = dpts;
|
|
|
|
continue;
|
|
|
|
failed:
|
|
fprint(2, "read_classifier_digest failed...\n");
|
|
for (; nclasses >= 0; nclasses--) {
|
|
if (rec->cnames[nclasses] != nil) {
|
|
free(rec->cnames[nclasses]);
|
|
rec->cnames[nclasses] = nil;
|
|
}
|
|
if (rec->dompts[nclasses] != nil) {
|
|
delete_examples(rec->dompts[nclasses]);
|
|
rec->dompts[nclasses] = nil;
|
|
}
|
|
}
|
|
if (dpts != nil)
|
|
delete_examples(dpts);
|
|
fclose(fp);
|
|
return(-1);
|
|
}
|
|
|
|
fclose(fp);
|
|
return(0);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
|
|
Canonicalization routines
|
|
|
|
*************************************************************/
|
|
|
|
static int lialg_canonicalize_examples(rClassifier *rec) {
|
|
int i;
|
|
int nclasses;
|
|
|
|
if (lidebug) {
|
|
fprint(2, "lialg_canonicalize_examples working on %s\n",
|
|
rec->file_name);
|
|
}
|
|
/* Initialize canonical-example arrays. */
|
|
for (i = 0; i < MAXSCLASSES; i++) {
|
|
rec->canonex[i] = nil;
|
|
}
|
|
|
|
/* Figure out number of classes. */
|
|
for (nclasses = 0;
|
|
nclasses < MAXSCLASSES && rec->cnames[nclasses] != nil;
|
|
nclasses++)
|
|
;
|
|
|
|
/* Canonicalize the examples for each class. */
|
|
for (i = 0; i < nclasses; i++) {
|
|
int j, k;
|
|
int nex;
|
|
point_list *pts, *tmp, *avg;
|
|
int maxxrange, maxyrange;
|
|
int minx, miny, maxx, maxy;
|
|
int avgxrange, avgyrange, avgxoff, avgyoff, avgscale;
|
|
|
|
|
|
if (lidebug) {
|
|
fprint(2, "lialg_canonicalize_examples working on class %s\n",
|
|
rec->cnames[i]);
|
|
}
|
|
/* Make a copy of the examples. */
|
|
pts = nil;
|
|
tmp = rec->ex[i];
|
|
for (nex = 0; tmp != nil; nex++, tmp = tmp->next) {
|
|
if ((pts = add_example(pts, tmp->npts, tmp->pts)) == nil) {
|
|
delete_examples(pts);
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
/* Canonicalize each example, and derive the max x and y ranges. */
|
|
maxxrange = 0;
|
|
maxyrange = 0;
|
|
for (j = 0, tmp = pts; j < nex; j++, tmp = tmp->next) {
|
|
if (lialg_canonicalize_example_stroke(tmp) != 0) {
|
|
if (lidebug) {
|
|
fprint(2, "lialg_canonicalize_example_stroke returned error\n");
|
|
}
|
|
return(-1);
|
|
}
|
|
|
|
if (tmp->xrange > maxxrange) maxxrange = tmp->xrange;
|
|
if (tmp->yrange > maxyrange) maxyrange = tmp->yrange;
|
|
}
|
|
|
|
/* Normalize max ranges. */
|
|
if (((100 * maxxrange + CANONICAL_X / 2) / CANONICAL_X) >
|
|
((100 * maxyrange + CANONICAL_Y / 2) / CANONICAL_Y)) {
|
|
maxyrange = (maxyrange * CANONICAL_X + maxxrange / 2) / maxxrange;
|
|
maxxrange = CANONICAL_X;
|
|
}
|
|
else {
|
|
maxxrange = (maxxrange * CANONICAL_Y + maxyrange / 2) / maxyrange;
|
|
maxyrange = CANONICAL_Y;
|
|
}
|
|
|
|
/* Re-scale each example to max ranges. */
|
|
for (j = 0, tmp = pts; j < nex; j++, tmp = tmp->next) {
|
|
int scalex = (tmp->xrange == 0) ? 100 : (100 * maxxrange + tmp->xrange / 2) / tmp->xrange;
|
|
int scaley = (tmp->yrange == 0) ? 100 : (100 * maxyrange + tmp->yrange / 2) / tmp->yrange;
|
|
if (lialg_translate_points(tmp, 0, 0, scalex, scaley) != 0) {
|
|
delete_examples(pts);
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
/* Average the examples; leave average in first example. */
|
|
avg = pts; /* careful aliasing!! */
|
|
for (k = 0; k < NCANONICAL; k++) {
|
|
int xsum = 0;
|
|
int ysum = 0;
|
|
|
|
for (j = 0, tmp = pts; j < nex; j++, tmp = tmp->next) {
|
|
xsum += tmp->pts[k].x;
|
|
ysum += tmp->pts[k].y;
|
|
}
|
|
|
|
avg->pts[k].x = (xsum + j / 2) / j;
|
|
avg->pts[k].y = (ysum + j / 2) / j;
|
|
}
|
|
|
|
/* Compute BB of averaged stroke and re-scale. */
|
|
lialg_get_bounding_box(avg, &minx, &miny, &maxx, &maxy);
|
|
avgxrange = maxx - minx;
|
|
avgyrange = maxy - miny;
|
|
avgscale = (((100 * avgxrange + CANONICAL_X / 2) / CANONICAL_X) >
|
|
((100 * avgyrange + CANONICAL_Y / 2) / CANONICAL_Y))
|
|
? (100 * CANONICAL_X + avgxrange / 2) / avgxrange
|
|
: (100 * CANONICAL_Y + avgyrange / 2) / avgyrange;
|
|
if (lialg_translate_points(avg, minx, miny, avgscale, avgscale) != 0) {
|
|
delete_examples(pts);
|
|
return(-1);
|
|
}
|
|
|
|
/* Re-compute the x and y ranges and center the stroke. */
|
|
lialg_get_bounding_box(avg, &minx, &miny, &maxx, &maxy);
|
|
avgxrange = maxx - minx;
|
|
avgyrange = maxy - miny;
|
|
avgxoff = -((CANONICAL_X - avgxrange + 1) / 2);
|
|
avgyoff = -((CANONICAL_Y - avgyrange + 1) / 2);
|
|
if (lialg_translate_points(avg, avgxoff, avgyoff, 100, 100) != 0) {
|
|
delete_examples(pts);
|
|
return(-1);
|
|
}
|
|
|
|
/* Create a point list to serve as the ``canonical representation. */
|
|
if ((rec->canonex[i] = add_example(nil, avg->npts, avg->pts)) == nil) {
|
|
delete_examples(pts);
|
|
return(-1);
|
|
}
|
|
(rec->canonex[i])->xrange = maxx - minx;
|
|
(rec->canonex[i])->yrange = maxy - miny;
|
|
|
|
if (lidebug) {
|
|
fprint(2, "%s, avgpts = %d\n", rec->cnames[i], avg->npts);
|
|
for (j = 0; j < avg->npts; j++) {
|
|
fprint(2, " (%P)\n", avg->pts[j].Point);
|
|
}
|
|
}
|
|
|
|
/* Compute dominant points of canonical representation. */
|
|
rec->dompts[i] = lialg_compute_dominant_points(avg);
|
|
|
|
/* Clean up. */
|
|
delete_examples(pts);
|
|
}
|
|
|
|
/* Sanity check. */
|
|
for (i = 0; i < nclasses; i++) {
|
|
char *best_name = lialg_recognize_stroke(rec, rec->canonex[i]);
|
|
|
|
if (best_name != rec->cnames[i])
|
|
fprint(2, "%s, best = %s\n", rec->cnames[i], best_name);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
static int lialg_canonicalize_example_stroke(point_list *points) {
|
|
int minx, miny, maxx, maxy, xrange, yrange, scale;
|
|
|
|
/* Filter out points that are too close. */
|
|
if (lialg_filter_points(points) != 0) return(-1);
|
|
|
|
/* Must be at least two points! */
|
|
if (points->npts < 2) {
|
|
if (lidebug) {
|
|
fprint(2, "lialg_canonicalize_example_stroke: npts=%d\n",
|
|
points->npts);
|
|
}
|
|
return(-1);
|
|
}
|
|
|
|
/* Scale up to avoid conversion errors. */
|
|
lialg_get_bounding_box(points, &minx, &miny, &maxx, &maxy);
|
|
xrange = maxx - minx;
|
|
yrange = maxy - miny;
|
|
scale = (((100 * xrange + CANONICAL_X / 2) / CANONICAL_X) >
|
|
((100 * yrange + CANONICAL_Y / 2) / CANONICAL_Y))
|
|
? (100 * CANONICAL_X + xrange / 2) / xrange
|
|
: (100 * CANONICAL_Y + yrange / 2) / yrange;
|
|
if (lialg_translate_points(points, minx, miny, scale, scale) != 0) {
|
|
if (lidebug) {
|
|
fprint(2, "lialg_translate_points (minx=%d,miny=%d,scale=%d) returned error\n", minx, miny, scale);
|
|
}
|
|
return(-1);
|
|
}
|
|
|
|
/* Compute an equivalent stroke with equi-distant points. */
|
|
if (lialg_compute_equipoints(points) != 0) return(-1);
|
|
|
|
/* Re-translate the points to the origin. */
|
|
lialg_get_bounding_box(points, &minx, &miny, &maxx, &maxy);
|
|
if (lialg_translate_points(points, minx, miny, 100, 100) != 0) {
|
|
if (lidebug) {
|
|
fprint(2, "lialg_translate_points (minx=%d,miny=%d) returned error\n", minx, miny);
|
|
}
|
|
return(-1);
|
|
}
|
|
|
|
/* Store the x and y ranges in the point list. */
|
|
xrange = maxx - minx;
|
|
yrange = maxy - miny;
|
|
points->xrange = xrange;
|
|
points->yrange = yrange;
|
|
|
|
if (lidebug) {
|
|
int i;
|
|
fprint(2, "Canonicalized: %d, %d, %d, %d\n", minx, miny, maxx, maxy);
|
|
for (i = 0; i < points->npts; i++)
|
|
fprint(2, " (%P)\n", points->pts[i].Point);
|
|
fflush(stderr);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
static int lialg_compute_equipoints(point_list *points) {
|
|
pen_point *equipoints = mallocz(NCANONICAL*sizeof(pen_point), 1);
|
|
int nequipoints = 0;
|
|
int pathlen = lialg_compute_pathlen(points);
|
|
int equidist = (pathlen + (NCANONICAL - 1) / 2) / (NCANONICAL - 1);
|
|
int i;
|
|
int dist_since_last_eqpt;
|
|
int remaining_seglen;
|
|
int dist_to_next_eqpt;
|
|
|
|
if (equipoints == nil) {
|
|
fprint(2, "can't allocate memory in lialg_compute_equipoints");
|
|
return(-1);
|
|
}
|
|
|
|
if (lidebug) {
|
|
fprint(2, "compute_equipoints: npts = %d, pathlen = %d, equidist = %d\n",
|
|
points->npts, pathlen, equidist);
|
|
fflush(stderr);
|
|
}
|
|
|
|
/* First original point is an equipoint. */
|
|
equipoints[0] = points->pts[0];
|
|
nequipoints++;
|
|
dist_since_last_eqpt = 0;
|
|
|
|
for (i = 1; i < points->npts; i++) {
|
|
int dx1 = points->pts[i].x - points->pts[i-1].x;
|
|
int dy1 = points->pts[i].y - points->pts[i-1].y;
|
|
int endx = 100 * points->pts[i-1].x;
|
|
int endy = 100 * points->pts[i-1].y;
|
|
remaining_seglen = isqrt(10000 * (dx1 * dx1 + dy1 * dy1));
|
|
dist_to_next_eqpt = equidist - dist_since_last_eqpt;
|
|
|
|
while (remaining_seglen >= dist_to_next_eqpt) {
|
|
if (dx1 == 0) {
|
|
/* x-coordinate stays the same */
|
|
if (dy1 >= 0)
|
|
endy += dist_to_next_eqpt;
|
|
else
|
|
endy -= dist_to_next_eqpt;
|
|
}
|
|
else {
|
|
int slope = (100 * dy1 + dx1 / 2) / dx1;
|
|
int tmp = isqrt(10000 + slope * slope);
|
|
int dx = (100 * dist_to_next_eqpt + tmp / 2) / tmp;
|
|
int dy = (slope * dx + 50) / 100;
|
|
|
|
if (dy < 0) dy = -dy;
|
|
if (dx1 >= 0)
|
|
endx += dx;
|
|
else
|
|
endx -= dx;
|
|
if (dy1 >= 0)
|
|
endy += dy;
|
|
else
|
|
endy -= dy;
|
|
}
|
|
|
|
equipoints[nequipoints].x = (endx + 50) / 100;
|
|
equipoints[nequipoints].y = (endy + 50) / 100;
|
|
nequipoints++;
|
|
/* assert(nequipoints <= NCANONICAL);*/
|
|
dist_since_last_eqpt = 0;
|
|
remaining_seglen -= dist_to_next_eqpt;
|
|
dist_to_next_eqpt = equidist;
|
|
}
|
|
|
|
dist_since_last_eqpt += remaining_seglen;
|
|
}
|
|
|
|
/* Take care of last equipoint. */
|
|
if (nequipoints == NCANONICAL) {
|
|
/* Good. */
|
|
} else if (nequipoints == (NCANONICAL - 1)) {
|
|
/* Make last original point the last equipoint. */
|
|
equipoints[nequipoints] = points->pts[points->npts - 1];
|
|
} else {
|
|
if (lidebug) {
|
|
fprint(2,"lialg_compute_equipoints: nequipoints = %d\n",
|
|
nequipoints);
|
|
}
|
|
/* assert(false);*/
|
|
return(-1);
|
|
}
|
|
|
|
points->npts = NCANONICAL;
|
|
delete_pen_point_array(points->pts);
|
|
points->pts = equipoints;
|
|
return(0);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
|
|
Utility routines
|
|
|
|
*************************************************************/
|
|
|
|
/* Result is x 100. */
|
|
static int lialg_compute_pathlen(point_list *points) {
|
|
return(lialg_compute_pathlen_subset(points, 0, points->npts - 1));
|
|
}
|
|
|
|
|
|
/* Result is x 100. */
|
|
static int lialg_compute_pathlen_subset(point_list *points,
|
|
int start, int end) {
|
|
int pathlen;
|
|
int i;
|
|
|
|
pathlen = 0;
|
|
for (i = start + 1; i <= end; i++) {
|
|
int dx = points->pts[i].x - points->pts[i-1].x;
|
|
int dy = points->pts[i].y - points->pts[i-1].y;
|
|
int dist = isqrt(10000 * (dx * dx + dy * dy));
|
|
pathlen += dist;
|
|
}
|
|
|
|
return(pathlen);
|
|
}
|
|
|
|
|
|
/* Note that this does NOT update points->xrange and points->yrange! */
|
|
static int lialg_filter_points(point_list *points) {
|
|
int filtered_npts;
|
|
pen_point *filtered_pts = mallocz(points->npts*sizeof(pen_point), 1);
|
|
int i;
|
|
|
|
if (filtered_pts == nil) {
|
|
fprint(2, "can't allocate memory in lialg_filter_points");
|
|
return(-1);
|
|
}
|
|
|
|
filtered_pts[0] = points->pts[0];
|
|
filtered_npts = 1;
|
|
for (i = 1; i < points->npts; i++) {
|
|
int j = filtered_npts - 1;
|
|
int dx = points->pts[i].x - filtered_pts[j].x;
|
|
int dy = points->pts[i].y - filtered_pts[j].y;
|
|
int magsq = dx * dx + dy * dy;
|
|
|
|
if (magsq >= DIST_SQ_THRESHOLD) {
|
|
filtered_pts[filtered_npts] = points->pts[i];
|
|
filtered_npts++;
|
|
}
|
|
}
|
|
|
|
points->npts = filtered_npts;
|
|
delete_pen_point_array(points->pts);
|
|
points->pts = filtered_pts;
|
|
return(0);
|
|
}
|
|
|
|
|
|
/* scalex and scaley are x 100. */
|
|
/* Note that this does NOT update points->xrange and points->yrange! */
|
|
static int lialg_translate_points(point_list *points,
|
|
int minx, int miny,
|
|
int scalex, int scaley) {
|
|
int i;
|
|
|
|
for (i = 0; i < points->npts; i++) {
|
|
points->pts[i].x = ((points->pts[i].x - minx) * scalex + 50) / 100;
|
|
points->pts[i].y = ((points->pts[i].y - miny) * scaley + 50) / 100;
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
static void lialg_get_bounding_box(point_list *points,
|
|
int *pminx, int *pminy,
|
|
int *pmaxx, int *pmaxy) {
|
|
int minx, miny, maxx, maxy;
|
|
int i;
|
|
|
|
minx = maxx = points->pts[0].x;
|
|
miny = maxy = points->pts[0].y;
|
|
for (i = 1; i < points->npts; i++) {
|
|
pen_point *pt = &(points->pts[i]);
|
|
if (pt->x < minx) minx = pt->x;
|
|
else if (pt->x > maxx) maxx = pt->x;
|
|
if (pt->y < miny) miny = pt->y;
|
|
else if (pt->y > maxy) maxy = pt->y;
|
|
}
|
|
|
|
*pminx = minx;
|
|
*pminy = miny;
|
|
*pmaxx = maxx;
|
|
*pmaxy = maxy;
|
|
}
|
|
|
|
|
|
int wtvals[] = {100, 104, 117, 143, 189, 271, 422};
|
|
|
|
static void lialg_compute_lpf_parameters(void) {
|
|
int i;
|
|
|
|
for (i = LP_FILTER_WIDTH; i >= 0; i--) {
|
|
// double x = 0.04 * (i * i);
|
|
// double tmp = 100.0 * exp(x);
|
|
// int wt = floor((double)tmp);
|
|
int wt = wtvals[i];
|
|
lialg_lpfwts[LP_FILTER_WIDTH - i] = wt;
|
|
lialg_lpfwts[LP_FILTER_WIDTH + i] = wt;
|
|
}
|
|
lialg_lpfconst = 0;
|
|
for (i = 0; i < (2 * LP_FILTER_WIDTH + 1); i++) {
|
|
lialg_lpfconst += lialg_lpfwts[i];
|
|
}
|
|
}
|
|
|
|
|
|
/* Code from Joseph Hall (jnhall@sat.mot.com). */
|
|
static int isqrt(int n) {
|
|
register int i;
|
|
register long k0, k1, nn;
|
|
|
|
for (nn = i = n, k0 = 2; i > 0; i >>= 2, k0 <<= 1)
|
|
;
|
|
nn <<= 2;
|
|
for (;;) {
|
|
k1 = (nn / k0 + k0) >> 1;
|
|
if (((k0 ^ k1) & ~1) == 0)
|
|
break;
|
|
k0 = k1;
|
|
}
|
|
return (int) ((k1 + 1) >> 1);
|
|
}
|
|
|
|
|
|
/* Helper routines from Mark Hayter. */
|
|
static int likeatan(int tantop, int tanbot) {
|
|
int t;
|
|
/* Use tan(theta)=top/bot --> order for t */
|
|
/* t in range 0..0x40000 */
|
|
|
|
if ((tantop == 0) && (tanbot == 0))
|
|
t = 0;
|
|
else
|
|
{
|
|
t = (tantop << 16) / (abs(tantop) + abs(tanbot));
|
|
if (tanbot < 0)
|
|
t = 0x20000 - t;
|
|
else
|
|
if (tantop < 0) t = 0x40000 + t;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
|
|
static int quadr(int t) {
|
|
return (8 - (((t + 0x4000) >> 15) & 7)) & 7;
|
|
}
|