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img_scanner.c
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/*------------------------------------------------------------------------
* Copyright 2007-2010 (c) Jeff Brown <[email protected]>
*
* This file is part of the ZBar Bar Code Reader.
*
* The ZBar Bar Code Reader is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* The ZBar Bar Code Reader is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with the ZBar Bar Code Reader; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* http://sourceforge.net/projects/zbar
*------------------------------------------------------------------------*/
#include <config.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#include <stdlib.h> /* malloc, free */
#include <string.h> /* memcmp, memset, memcpy */
#include <assert.h>
#include <zbar.h>
#include "error.h"
#include "image.h"
#include "timer.h"
#ifdef ENABLE_QRCODE
# include "qrcode.h"
#endif
#include "img_scanner.h"
#include "svg.h"
#if 1
# define ASSERT_POS \
assert(p == data + x + y * (intptr_t)w)
#else
# define ASSERT_POS
#endif
/* FIXME cache setting configurability */
/* time interval for which two images are considered "nearby"
*/
#define CACHE_PROXIMITY 1000 /* ms */
/* time that a result must *not* be detected before
* it will be reported again
*/
#define CACHE_HYSTERESIS 2000 /* ms */
/* time after which cache entries are invalidated
*/
#define CACHE_TIMEOUT (CACHE_HYSTERESIS * 2) /* ms */
#define NUM_SCN_CFGS (ZBAR_CFG_Y_DENSITY - ZBAR_CFG_X_DENSITY + 1)
#define CFG(iscn, cfg) ((iscn)->configs[(cfg) - ZBAR_CFG_X_DENSITY])
#define TEST_CFG(iscn, cfg) (((iscn)->config >> ((cfg) - ZBAR_CFG_POSITION)) & 1)
#ifndef NO_STATS
# define STAT(x) iscn->stat_##x++
#else
# define STAT(...)
# define dump_stats(...)
#endif
#define RECYCLE_BUCKETS 5
typedef struct recycle_bucket_s {
int nsyms;
zbar_symbol_t *head;
} recycle_bucket_t;
/* image scanner state */
struct zbar_image_scanner_s {
zbar_scanner_t *scn; /* associated linear intensity scanner */
zbar_decoder_t *dcode; /* associated symbol decoder */
#ifdef ENABLE_QRCODE
qr_reader *qr; /* QR Code 2D reader */
#endif
const void *userdata; /* application data */
/* user result callback */
zbar_image_data_handler_t *handler;
unsigned long time; /* scan start time */
zbar_image_t *img; /* currently scanning image *root* */
int dx, dy, du, umin, v; /* current scan direction */
zbar_symbol_set_t *syms; /* previous decode results */
/* recycled symbols in 4^n size buckets */
recycle_bucket_t recycle[RECYCLE_BUCKETS];
int enable_cache; /* current result cache state */
zbar_symbol_t *cache; /* inter-image result cache entries */
/* configuration settings */
unsigned config; /* config flags */
unsigned ean_config;
int configs[NUM_SCN_CFGS]; /* int valued configurations */
int sym_configs[1][NUM_SYMS]; /* per-symbology configurations */
#ifndef NO_STATS
int stat_syms_new;
int stat_iscn_syms_inuse, stat_iscn_syms_recycle;
int stat_img_syms_inuse, stat_img_syms_recycle;
int stat_sym_new;
int stat_sym_recycle[RECYCLE_BUCKETS];
#endif
};
void _zbar_image_scanner_recycle_syms (zbar_image_scanner_t *iscn,
zbar_symbol_t *sym)
{
zbar_symbol_t *next = NULL;
for(; sym; sym = next) {
next = sym->next;
if(sym->refcnt && _zbar_refcnt(&sym->refcnt, -1)) {
/* unlink referenced symbol */
/* FIXME handle outstanding component refs (currently unsupported)
*/
assert(sym->data_alloc);
sym->next = NULL;
}
else {
int i;
recycle_bucket_t *bucket;
/* recycle unreferenced symbol */
if(!sym->data_alloc) {
sym->data = NULL;
sym->datalen = 0;
}
if(sym->syms) {
if(_zbar_refcnt(&sym->syms->refcnt, -1))
assert(0);
_zbar_image_scanner_recycle_syms(iscn, sym->syms->head);
sym->syms->head = NULL;
_zbar_symbol_set_free(sym->syms);
sym->syms = NULL;
}
for(i = 0; i < RECYCLE_BUCKETS; i++)
if(sym->data_alloc < 1 << (i * 2))
break;
if(i == RECYCLE_BUCKETS) {
assert(sym->data);
free(sym->data);
sym->data = NULL;
sym->data_alloc = 0;
i = 0;
}
bucket = &iscn->recycle[i];
/* FIXME cap bucket fill */
bucket->nsyms++;
sym->next = bucket->head;
bucket->head = sym;
}
}
}
static inline int recycle_syms (zbar_image_scanner_t *iscn,
zbar_symbol_set_t *syms)
{
if(_zbar_refcnt(&syms->refcnt, -1))
return(1);
_zbar_image_scanner_recycle_syms(iscn, syms->head);
syms->head = syms->tail = NULL;
syms->nsyms = 0;
return(0);
}
inline void zbar_image_scanner_recycle_image (zbar_image_scanner_t *iscn,
zbar_image_t *img)
{
zbar_symbol_set_t *syms = iscn->syms;
if(syms && syms->refcnt) {
if(recycle_syms(iscn, syms)) {
STAT(iscn_syms_inuse);
iscn->syms = NULL;
}
else
STAT(iscn_syms_recycle);
}
syms = img->syms;
img->syms = NULL;
if(syms && recycle_syms(iscn, syms))
STAT(img_syms_inuse);
else if(syms) {
STAT(img_syms_recycle);
/* select one set to resurrect, destroy the other */
if(iscn->syms)
_zbar_symbol_set_free(syms);
else
iscn->syms = syms;
}
}
inline zbar_symbol_t*
_zbar_image_scanner_alloc_sym (zbar_image_scanner_t *iscn,
zbar_symbol_type_t type,
int datalen)
{
/* recycle old or alloc new symbol */
zbar_symbol_t *sym = NULL;
int i;
for(i = 0; i < RECYCLE_BUCKETS - 1; i++)
if(datalen <= 1 << (i * 2))
break;
for(; i > 0; i--)
if((sym = iscn->recycle[i].head)) {
STAT(sym_recycle[i]);
break;
}
if(sym) {
iscn->recycle[i].head = sym->next;
sym->next = NULL;
assert(iscn->recycle[i].nsyms);
iscn->recycle[i].nsyms--;
}
else {
sym = calloc(1, sizeof(zbar_symbol_t));
STAT(sym_new);
}
/* init new symbol */
sym->type = type;
sym->quality = 1;
sym->npts = 0;
sym->orient = ZBAR_ORIENT_UNKNOWN;
sym->cache_count = 0;
sym->time = iscn->time;
assert(!sym->syms);
if(datalen > 0) {
sym->datalen = datalen - 1;
if(sym->data_alloc < datalen) {
if(sym->data)
free(sym->data);
sym->data_alloc = datalen;
sym->data = malloc(datalen);
}
}
else {
if(sym->data)
free(sym->data);
sym->data = NULL;
sym->datalen = sym->data_alloc = 0;
}
return(sym);
}
static inline zbar_symbol_t *cache_lookup (zbar_image_scanner_t *iscn,
zbar_symbol_t *sym)
{
/* search for matching entry in cache */
zbar_symbol_t **entry = &iscn->cache;
while(*entry) {
if((*entry)->type == sym->type &&
(*entry)->datalen == sym->datalen &&
!memcmp((*entry)->data, sym->data, sym->datalen))
break;
if((sym->time - (*entry)->time) > CACHE_TIMEOUT) {
/* recycle stale cache entry */
zbar_symbol_t *next = (*entry)->next;
(*entry)->next = NULL;
_zbar_image_scanner_recycle_syms(iscn, *entry);
*entry = next;
}
else
entry = &(*entry)->next;
}
return(*entry);
}
static inline void cache_sym (zbar_image_scanner_t *iscn,
zbar_symbol_t *sym)
{
if(iscn->enable_cache) {
uint32_t age, near_thresh, far_thresh, dup;
zbar_symbol_t *entry = cache_lookup(iscn, sym);
if(!entry) {
/* FIXME reuse sym */
entry = _zbar_image_scanner_alloc_sym(iscn, sym->type,
sym->datalen + 1);
entry->configs = sym->configs;
entry->modifiers = sym->modifiers;
memcpy(entry->data, sym->data, sym->datalen);
entry->time = sym->time - CACHE_HYSTERESIS;
entry->cache_count = 0;
/* add to cache */
entry->next = iscn->cache;
iscn->cache = entry;
}
/* consistency check and hysteresis */
age = sym->time - entry->time;
entry->time = sym->time;
near_thresh = (age < CACHE_PROXIMITY);
far_thresh = (age >= CACHE_HYSTERESIS);
dup = (entry->cache_count >= 0);
if((!dup && !near_thresh) || far_thresh) {
int type = sym->type;
int h = _zbar_get_symbol_hash(type);
entry->cache_count = -iscn->sym_configs[0][h];
}
else if(dup || near_thresh)
entry->cache_count++;
sym->cache_count = entry->cache_count;
}
else
sym->cache_count = 0;
}
void _zbar_image_scanner_add_sym(zbar_image_scanner_t *iscn,
zbar_symbol_t *sym)
{
zbar_symbol_set_t *syms;
cache_sym(iscn, sym);
syms = iscn->syms;
if(sym->cache_count || !syms->tail) {
sym->next = syms->head;
syms->head = sym;
}
else {
sym->next = syms->tail->next;
syms->tail->next = sym;
}
if(!sym->cache_count)
syms->nsyms++;
else if(!syms->tail)
syms->tail = sym;
_zbar_symbol_refcnt(sym, 1);
}
#ifdef ENABLE_QRCODE
extern qr_finder_line *_zbar_decoder_get_qr_finder_line(zbar_decoder_t*);
# define QR_FIXED(v, rnd) ((((v) << 1) + (rnd)) << (QR_FINDER_SUBPREC - 1))
# define PRINT_FIXED(val, prec) \
((val) >> (prec)), \
(1000 * ((val) & ((1 << (prec)) - 1)) / (1 << (prec)))
static inline void qr_handler (zbar_image_scanner_t *iscn)
{
unsigned u;
int vert;
qr_finder_line *line = _zbar_decoder_get_qr_finder_line(iscn->dcode);
assert(line);
u = zbar_scanner_get_edge(iscn->scn, line->pos[0],
QR_FINDER_SUBPREC);
line->boffs = u - zbar_scanner_get_edge(iscn->scn, line->boffs,
QR_FINDER_SUBPREC);
line->len = zbar_scanner_get_edge(iscn->scn, line->len,
QR_FINDER_SUBPREC);
line->eoffs = zbar_scanner_get_edge(iscn->scn, line->eoffs,
QR_FINDER_SUBPREC) - line->len;
line->len -= u;
u = QR_FIXED(iscn->umin, 0) + iscn->du * u;
if(iscn->du < 0) {
int tmp = line->boffs;
line->boffs = line->eoffs;
line->eoffs = tmp;
u -= line->len;
}
vert = !iscn->dx;
line->pos[vert] = u;
line->pos[!vert] = QR_FIXED(iscn->v, 1);
_zbar_qr_found_line(iscn->qr, vert, line);
}
#endif
static void symbol_handler (zbar_decoder_t *dcode)
{
zbar_image_scanner_t *iscn = zbar_decoder_get_userdata(dcode);
zbar_symbol_type_t type = zbar_decoder_get_type(dcode);
int x = 0, y = 0, dir;
const char *data;
unsigned datalen;
zbar_symbol_t *sym;
#ifdef ENABLE_QRCODE
if(type == ZBAR_QRCODE) {
qr_handler(iscn);
return;
}
#else
assert(type != ZBAR_QRCODE);
#endif
if(TEST_CFG(iscn, ZBAR_CFG_POSITION)) {
/* tmp position fixup */
int w = zbar_scanner_get_width(iscn->scn);
int u = iscn->umin + iscn->du * zbar_scanner_get_edge(iscn->scn, w, 0);
if(iscn->dx) {
x = u;
y = iscn->v;
}
else {
x = iscn->v;
y = u;
}
}
/* FIXME debug flag to save/display all PARTIALs */
if(type <= ZBAR_PARTIAL) {
zprintf(256, "partial symbol @(%d,%d)\n", x, y);
return;
}
data = zbar_decoder_get_data(dcode);
datalen = zbar_decoder_get_data_length(dcode);
/* FIXME need better symbol matching */
for(sym = iscn->syms->head; sym; sym = sym->next)
if(sym->type == type &&
sym->datalen == datalen &&
!memcmp(sym->data, data, datalen)) {
sym->quality++;
zprintf(224, "dup symbol @(%d,%d): dup %s: %.20s\n",
x, y, zbar_get_symbol_name(type), data);
if(TEST_CFG(iscn, ZBAR_CFG_POSITION))
/* add new point to existing set */
/* FIXME should be polygon */
sym_add_point(sym, x, y);
return;
}
sym = _zbar_image_scanner_alloc_sym(iscn, type, datalen + 1);
sym->configs = zbar_decoder_get_configs(dcode, type);
sym->modifiers = zbar_decoder_get_modifiers(dcode);
/* FIXME grab decoder buffer */
memcpy(sym->data, data, datalen + 1);
/* initialize first point */
if(TEST_CFG(iscn, ZBAR_CFG_POSITION)) {
zprintf(192, "new symbol @(%d,%d): %s: %.20s\n",
x, y, zbar_get_symbol_name(type), data);
sym_add_point(sym, x, y);
}
dir = zbar_decoder_get_direction(dcode);
if(dir)
sym->orient = (iscn->dy != 0) + ((iscn->du ^ dir) & 2);
_zbar_image_scanner_add_sym(iscn, sym);
}
zbar_image_scanner_t *zbar_image_scanner_create ()
{
zbar_image_scanner_t *iscn = calloc(1, sizeof(zbar_image_scanner_t));
if(!iscn)
return(NULL);
iscn->dcode = zbar_decoder_create();
iscn->scn = zbar_scanner_create(iscn->dcode);
if(!iscn->dcode || !iscn->scn) {
zbar_image_scanner_destroy(iscn);
return(NULL);
}
zbar_decoder_set_userdata(iscn->dcode, iscn);
zbar_decoder_set_handler(iscn->dcode, symbol_handler);
#ifdef ENABLE_QRCODE
iscn->qr = _zbar_qr_create();
#endif
/* apply default configuration */
CFG(iscn, ZBAR_CFG_X_DENSITY) = 1;
CFG(iscn, ZBAR_CFG_Y_DENSITY) = 1;
zbar_image_scanner_set_config(iscn, 0, ZBAR_CFG_POSITION, 1);
zbar_image_scanner_set_config(iscn, 0, ZBAR_CFG_UNCERTAINTY, 2);
zbar_image_scanner_set_config(iscn, ZBAR_QRCODE, ZBAR_CFG_UNCERTAINTY, 0);
zbar_image_scanner_set_config(iscn, ZBAR_CODE128, ZBAR_CFG_UNCERTAINTY, 0);
zbar_image_scanner_set_config(iscn, ZBAR_CODE93, ZBAR_CFG_UNCERTAINTY, 0);
zbar_image_scanner_set_config(iscn, ZBAR_CODE39, ZBAR_CFG_UNCERTAINTY, 0);
zbar_image_scanner_set_config(iscn, ZBAR_CODABAR, ZBAR_CFG_UNCERTAINTY, 1);
zbar_image_scanner_set_config(iscn, ZBAR_COMPOSITE, ZBAR_CFG_UNCERTAINTY, 0);
return(iscn);
}
#ifndef NO_STATS
static inline void dump_stats (const zbar_image_scanner_t *iscn)
{
int i;
zprintf(1, "symbol sets allocated = %-4d\n", iscn->stat_syms_new);
zprintf(1, " scanner syms in use = %-4d\trecycled = %-4d\n",
iscn->stat_iscn_syms_inuse, iscn->stat_iscn_syms_recycle);
zprintf(1, " image syms in use = %-4d\trecycled = %-4d\n",
iscn->stat_img_syms_inuse, iscn->stat_img_syms_recycle);
zprintf(1, "symbols allocated = %-4d\n", iscn->stat_sym_new);
for(i = 0; i < RECYCLE_BUCKETS; i++)
zprintf(1, " recycled[%d] = %-4d\n",
i, iscn->stat_sym_recycle[i]);
}
#endif
void zbar_image_scanner_destroy (zbar_image_scanner_t *iscn)
{
int i;
dump_stats(iscn);
if(iscn->syms) {
if(iscn->syms->refcnt)
zbar_symbol_set_ref(iscn->syms, -1);
else
_zbar_symbol_set_free(iscn->syms);
iscn->syms = NULL;
}
if(iscn->scn)
zbar_scanner_destroy(iscn->scn);
iscn->scn = NULL;
if(iscn->dcode)
zbar_decoder_destroy(iscn->dcode);
iscn->dcode = NULL;
for(i = 0; i < RECYCLE_BUCKETS; i++) {
zbar_symbol_t *sym, *next;
for(sym = iscn->recycle[i].head; sym; sym = next) {
next = sym->next;
_zbar_symbol_free(sym);
}
}
#ifdef ENABLE_QRCODE
if(iscn->qr) {
_zbar_qr_destroy(iscn->qr);
iscn->qr = NULL;
}
#endif
free(iscn);
}
zbar_image_data_handler_t*
zbar_image_scanner_set_data_handler (zbar_image_scanner_t *iscn,
zbar_image_data_handler_t *handler,
const void *userdata)
{
zbar_image_data_handler_t *result = iscn->handler;
iscn->handler = handler;
iscn->userdata = userdata;
return(result);
}
int zbar_image_scanner_set_config (zbar_image_scanner_t *iscn,
zbar_symbol_type_t sym,
zbar_config_t cfg,
int val)
{
if((sym == 0 || sym == ZBAR_COMPOSITE) && cfg == ZBAR_CFG_ENABLE) {
iscn->ean_config = !!val;
if(sym)
return(0);
}
if(cfg < ZBAR_CFG_UNCERTAINTY)
return(zbar_decoder_set_config(iscn->dcode, sym, cfg, val));
if(cfg < ZBAR_CFG_POSITION) {
int c, i;
if(cfg > ZBAR_CFG_UNCERTAINTY)
return(1);
c = cfg - ZBAR_CFG_UNCERTAINTY;
if(sym > ZBAR_PARTIAL) {
i = _zbar_get_symbol_hash(sym);
iscn->sym_configs[c][i] = val;
}
else
for(i = 0; i < NUM_SYMS; i++)
iscn->sym_configs[c][i] = val;
return(0);
}
if(sym > ZBAR_PARTIAL)
return(1);
if(cfg >= ZBAR_CFG_X_DENSITY && cfg <= ZBAR_CFG_Y_DENSITY) {
CFG(iscn, cfg) = val;
return(0);
}
if(cfg > ZBAR_CFG_POSITION)
return(1);
cfg -= ZBAR_CFG_POSITION;
if(!val)
iscn->config &= ~(1 << cfg);
else if(val == 1)
iscn->config |= (1 << cfg);
else
return(1);
return(0);
}
void zbar_image_scanner_enable_cache (zbar_image_scanner_t *iscn,
int enable)
{
if(iscn->cache) {
/* recycle all cached syms */
_zbar_image_scanner_recycle_syms(iscn, iscn->cache);
iscn->cache = NULL;
}
iscn->enable_cache = (enable) ? 1 : 0;
}
const zbar_symbol_set_t *
zbar_image_scanner_get_results (const zbar_image_scanner_t *iscn)
{
return(iscn->syms);
}
static inline void quiet_border (zbar_image_scanner_t *iscn)
{
/* flush scanner pipeline */
zbar_scanner_t *scn = iscn->scn;
zbar_scanner_flush(scn);
zbar_scanner_flush(scn);
zbar_scanner_new_scan(scn);
}
#define movedelta(dx, dy) do { \
x += (dx); \
y += (dy); \
p += (dx) + ((uintptr_t)(dy) * w); \
} while(0);
int zbar_scan_image (zbar_image_scanner_t *iscn,
zbar_image_t *img)
{
zbar_symbol_set_t *syms;
const uint8_t *data;
zbar_scanner_t *scn = iscn->scn;
unsigned w, h, cx1, cy1;
int density;
/* timestamp image
* FIXME prefer video timestamp
*/
iscn->time = _zbar_timer_now();
#ifdef ENABLE_QRCODE
_zbar_qr_reset(iscn->qr);
#endif
/* image must be in grayscale format */
if(img->format != fourcc('Y','8','0','0') &&
img->format != fourcc('G','R','E','Y'))
return(-1);
iscn->img = img;
printf("MAB %s - image is in greyscale\n", __func__);
/* recycle previous scanner and image results */
zbar_image_scanner_recycle_image(iscn, img);
syms = iscn->syms;
if(!syms) {
syms = iscn->syms = _zbar_symbol_set_create();
STAT(syms_new);
zbar_symbol_set_ref(syms, 1);
}
else
zbar_symbol_set_ref(syms, 2);
img->syms = syms;
w = img->width;
h = img->height;
cx1 = img->crop_x + img->crop_w;
assert(cx1 <= w);
cy1 = img->crop_y + img->crop_h;
assert(cy1 <= h);
data = img->data;
zbar_image_write_png(img, "debug.png");
svg_open("debug.svg", 0, 0, w, h);
svg_image("debug.png", w, h);
zbar_scanner_new_scan(scn);
density = CFG(iscn, ZBAR_CFG_Y_DENSITY);
if(density > 0) {
const uint8_t *p = data;
int x = 0, y = 0;
int border = (((img->crop_h - 1) % density) + 1) / 2;
if(border > img->crop_h / 2)
border = img->crop_h / 2;
border += img->crop_y;
assert(border <= h);
svg_group_start("scanner", 0, 1, 1, 0, 0);
iscn->dy = 0;
movedelta(img->crop_x, border);
iscn->v = y;
while(y < cy1) {
int cx0 = img->crop_x;;
zprintf(128, "img_x+: %04d,%04d @%p\n", x, y, p);
svg_path_start("vedge", 1. / 32, 0, y + 0.5);
iscn->dx = iscn->du = 1;
iscn->umin = cx0;
while(x < cx1) {
uint8_t d = *p;
movedelta(1, 0);
zbar_scan_y(scn, d);
}
ASSERT_POS;
quiet_border(iscn);
svg_path_end();
movedelta(-1, density);
iscn->v = y;
if(y >= cy1)
break;
zprintf(128, "img_x-: %04d,%04d @%p\n", x, y, p);
svg_path_start("vedge", -1. / 32, w, y + 0.5);
iscn->dx = iscn->du = -1;
iscn->umin = cx1;
while(x >= cx0) {
uint8_t d = *p;
movedelta(-1, 0);
zbar_scan_y(scn, d);
}
ASSERT_POS;
quiet_border(iscn);
svg_path_end();
movedelta(1, density);
iscn->v = y;
}
svg_group_end();
}
iscn->dx = 0;
density = CFG(iscn, ZBAR_CFG_X_DENSITY);
if(density > 0) {
const uint8_t *p = data;
int x = 0, y = 0;
int border = (((img->crop_w - 1) % density) + 1) / 2;
if(border > img->crop_w / 2)
border = img->crop_w / 2;
border += img->crop_x;
assert(border <= w);
svg_group_start("scanner", 90, 1, -1, 0, 0);
movedelta(border, img->crop_y);
iscn->v = x;
while(x < cx1) {
int cy0 = img->crop_y;
zprintf(128, "img_y+: %04d,%04d @%p\n", x, y, p);
svg_path_start("vedge", 1. / 32, 0, x + 0.5);
iscn->dy = iscn->du = 1;
iscn->umin = cy0;
while(y < cy1) {
uint8_t d = *p;
movedelta(0, 1);
zbar_scan_y(scn, d);
}
ASSERT_POS;
quiet_border(iscn);
svg_path_end();
movedelta(density, -1);
iscn->v = x;
if(x >= cx1)
break;
zprintf(128, "img_y-: %04d,%04d @%p\n", x, y, p);
svg_path_start("vedge", -1. / 32, h, x + 0.5);
iscn->dy = iscn->du = -1;
iscn->umin = cy1;
while(y >= cy0) {
uint8_t d = *p;
movedelta(0, -1);
zbar_scan_y(scn, d);
}
ASSERT_POS;
quiet_border(iscn);
svg_path_end();
movedelta(density, 1);
iscn->v = x;
}
svg_group_end();
}
iscn->dy = 0;
iscn->img = NULL;
#ifdef ENABLE_QRCODE
_zbar_qr_decode(iscn->qr, iscn, img);
#endif
/* FIXME tmp hack to filter bad EAN results */
/* FIXME tmp hack to merge simple case EAN add-ons */
char filter = (!iscn->enable_cache &&
(density == 1 || CFG(iscn, ZBAR_CFG_Y_DENSITY) == 1));
int nean = 0, naddon = 0;
if(syms->nsyms) {
zbar_symbol_t **symp;
for(symp = &syms->head; *symp; ) {
zbar_symbol_t *sym = *symp;
if(sym->cache_count <= 0 &&
((sym->type < ZBAR_COMPOSITE && sym->type > ZBAR_PARTIAL) ||
sym->type == ZBAR_DATABAR ||
sym->type == ZBAR_DATABAR_EXP ||
sym->type == ZBAR_CODABAR))
{
if((sym->type == ZBAR_CODABAR || filter) && sym->quality < 4) {
if(iscn->enable_cache) {
/* revert cache update */
zbar_symbol_t *entry = cache_lookup(iscn, sym);
if(entry)
entry->cache_count--;
else
assert(0);
}
/* recycle */
*symp = sym->next;
syms->nsyms--;
sym->next = NULL;
_zbar_image_scanner_recycle_syms(iscn, sym);
continue;
}
else if(sym->type < ZBAR_COMPOSITE &&
sym->type != ZBAR_ISBN10)
{
if(sym->type > ZBAR_EAN5)
nean++;
else
naddon++;
}
}
symp = &sym->next;
}
if(nean == 1 && naddon == 1 && iscn->ean_config) {
/* create container symbol for composite result */
zbar_symbol_t *ean = NULL, *addon = NULL;
for(symp = &syms->head; *symp; ) {
zbar_symbol_t *sym = *symp;
if(sym->type < ZBAR_COMPOSITE && sym->type > ZBAR_PARTIAL) {
/* move to composite */
*symp = sym->next;
syms->nsyms--;
sym->next = NULL;
if(sym->type <= ZBAR_EAN5)
addon = sym;
else
ean = sym;
}
else
symp = &sym->next;
}
assert(ean);
assert(addon);
int datalen = ean->datalen + addon->datalen + 1;
zbar_symbol_t *ean_sym =
_zbar_image_scanner_alloc_sym(iscn, ZBAR_COMPOSITE, datalen);
ean_sym->orient = ean->orient;
ean_sym->syms = _zbar_symbol_set_create();
memcpy(ean_sym->data, ean->data, ean->datalen);
memcpy(ean_sym->data + ean->datalen,
addon->data, addon->datalen + 1);
ean_sym->syms->head = ean;
ean->next = addon;
ean_sym->syms->nsyms = 2;
_zbar_image_scanner_add_sym(iscn, ean_sym);
}
}
if(syms->nsyms && iscn->handler)
iscn->handler(img, iscn->userdata);
svg_close();
return(syms->nsyms);
}
#ifdef DEBUG_SVG
/* FIXME lame...*/
# include "svg.c"
#endif