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tesseract/ccutil/ocrclass.h

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/**********************************************************************
* File: ocrclass.h
* Description: Class definitions and constants for the OCR API.
* Author: Hewlett-Packard Co
*
* (C) Copyright 1996, Hewlett-Packard Co.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
**********************************************************************/
/**********************************************************************
* This file contains typedefs for all the structures used by
* the HP OCR interface.
* The code is designed to be used with either a C or C++ compiler.
* The structures are designed to allow them to be used with any
* structure alignment upto 8.
**********************************************************************/
#ifndef OCRCLASS_H
#define OCRCLASS_H
#ifdef __MSW32__
#include <windows.h>
#include "gettimeofday.h"
#else
#include <sys/time.h>
#endif
#include <time.h>
#include "host.h"
/*Maximum lengths of various strings*/
#define MAX_FONT_NAME 34 /*name of font */
#define MAX_OCR_NAME 32 /*name of engine */
#define MAX_OCR_VERSION 17 /*version code of engine */
/*Image parameters*/
#define MIN_IMAGE_SIZE 64 /*smallest image that will be passed */
#define IMAGE_ROUNDING 32 /*all sizes are multiple of this */
#if defined(__SLOW_TIMES__)
/*Maximum timeouts of various functions (in secs)*/
#define STARTUP_TIMEOUT 100 /*start of OCR engine */
#define SHUTDOWN_TIMEOUT 50 /*end of OCR engine */
#define SENDIM_TIMEOUT 50 /*send of image */
#define RELEASE_TIMEOUT 50 /*release of semaphore */
#define READIM_TIMEOUT 100 /*read of image */
#define READTEXT_TIMEOUT 50 /*read of text */
#define PROGRESS_TIMEOUT 30 /*progress every 3 seconds */
#define BADTIMES_TIMEOUT 7 /*max lack of progress */
#else
/*Maximum timeouts of various functions (in secs)*/
#define STARTUP_TIMEOUT 10 /*start of OCR engine */
#define SHUTDOWN_TIMEOUT 6 /*end of OCR engine */
#define SENDIM_TIMEOUT 5 /*send of image */
#define RELEASE_TIMEOUT 5 /*release of semaphore */
#define READIM_TIMEOUT 10 /*read of image */
#define READTEXT_TIMEOUT 5 /*read of text */
#define PROGRESS_TIMEOUT 3 /*progress every 3 seconds */
#define BADTIMES_TIMEOUT 7 /*max lack of progress */
#endif
/*language definitions are identical to RTF*/
#define LANGE_NONE 0x0400 /*no language */
#define LANGE_ALBANIAN 0x041c /*Albanian */
#define LANGE_BRITISH 0x0809 /*International English */
#define LANGE_BULGARIAN 0x0402 /*Bulgarian */
#define LANGE_CROATIAN 0x041a /*Croatian(latin alphabet) */
#define LANGE_CZECH 0x0405 /*Czech */
#define LANGE_DANISH 0x0406 /*Danish */
#define LANGE_DUTCH 0x0413 /*Dutch */
#define LANGE_FINNISH 0x040b /*Finnish */
#define LANGE_FRENCH 0x040c /*French */
#define LANGE_GERMAN 0x0407 /*German */
#define LANGE_GREEK 0x0408 /*Greek */
#define LANGE_HUNGARIAN 0x040e /*Hungarian */
#define LANGE_ITALIAN 0x0410 /*Italian */
#define LANGE_JAPANESE 0x0411 /*Japanese */
#define LANGE_KOREAN 0x0412 /*Korean */
#define LANGE_NORWEGIAN 0x0414 /*Bokmal */
#define LANGE_POLISH 0x0415 /*Polish */
#define LANGE_PORTUGESE 0x0416 /*Brazilian Portugese */
#define LANGE_ROMANIAN 0x0418 /*Romanian */
#define LANGE_RUSSIAN 0x0419 /*Russian */
#define LANGE_SCHINESE 0x0804 /*Simplified Chinese */
#define LANGE_SLOVAK 0x041b /*Slovak */
#define LANGE_SPANISH 0x040a /*Castilian */
#define LANGE_SWEDISH 0x041d /*Swedish */
#define LANGE_TCHINESE 0x0404 /*Traditional Chinese */
#define LANGE_TURKISH 0x041f /*Turkish */
#define LANGE_USENGLISH 0x0409 /*American */
/*font family definitions are identical to RTF*/
#define FFAM_NONE 0 /*unknown */
#define FFAM_ROMAN 1 /*serifed prop */
#define FFAM_SWISS 2 /*sans-serif prop */
#define FFAM_MODERN 3 /*fixed pitch */
/*character set definitions are identical to RTF*/
#define CHSET_ANSI 0 /*Ansi efigs */
#define CHSET_SHIFT_JIS 128 /*JIS X 0208-1990 */
#define CHSET_KOREAN 129 /*KS C 5601-1992 */
#define CHSET_SCHINESE 134 /*GB 2312-80 */
#define CHSET_BIG5 136 /*Big Five */
#define CHSET_CYRILLIC 204 /*Cyrillic */
#define CHSET_EEUROPE 238 /*Eastern Europe */
/*pitch set definitions are identical to RTF*/
#define PITCH_DEF 0 /*default */
#define PITCH_FIXED 1 /*fixed pitch */
#define PITCH_VAR 2 /*variable pitch */
/*Bitmasks for character enhancements.
OR these together for enhancement in ocr_append_char*/
#define EUC_BOLD 1 /*bold character */
#define EUC_ITALIC 2 /*italic char */
#define EUC_UNDERLINE 4 /*underlined char */
#define EUC_SUBSCRIPT 8 /*subscript char */
#define EUC_SUPERSCRIPT 16 /*superscript char */
/*enum for character rendering direction*/
enum OCR_CHAR_DIRECTION
{
OCR_CDIR_RIGHT_LEFT, /*right to left horizontal */
OCR_CDIR_LEFT_RIGHT, /*left to right horizontal */
OCR_CDIR_TOP_BOTTOM, /*top to bottom vertical */
OCR_CDIR_BOTTOM_TOP /*bottom to top vertical */
};
/*enum for line rendering direction*/
enum OCR_LINE_DIRECTION
{
OCR_LDIR_DOWN_RIGHT, /*horizontal lines go down */
/*vertical lines go right */
OCR_LDIR_UP_LEFT /*horizontal lines go up */
};
/*enum for newline type*/
enum OCR_NEWLINE_TYPE
{
OCR_NL_NONE, /*not a newline */
OCR_NL_NEWLINE, /*this is a newline but not new para */
OCR_NL_NEWPARA /*this is a newline and a new para */
};
/*error codes that can be returned from the API functions other than OKAY and HPERR*/
#define OCR_API_NO_MEM (-2) /*filled output buffer */
#define OCR_API_BAD_CHAR (-3) /*whitespace sent to ocr_append_char */
#define OCR_API_BAD_STATE (-4) /*invalid call sequence */
/*error codes used for passing errors back to the HP side*/
enum OCR_ERR_CODE
{
OCR_ERR_NONE, /*no error */
OCR_ERR_CLEAN_EXIT, /*no error */
OCR_ERR_NO_MEM, /*out of memory */
OCR_ERR_FILE_READ, /*failed to read data file */
OCR_ERR_TMP_WRITE, /*failed to write temp file */
OCR_ERR_TMP_READ, /*failed to read temp file */
OCR_ERR_BAD_DLL, /*missing or invalid dll subcomponent */
OCR_ERR_BAD_EXE, /*missing or invalid exe subcomponent */
OCR_ERR_BAD_LOAD, /*failed to load subcomponent */
OCR_ERR_BAD_LANG, /*unable to recognize requested language */
OCR_ERR_BAD_STATE, /*engine did call out of sequence */
OCR_ERR_INTERNAL1, /*internal error type 1 */
OCR_ERR_INTERNAL2, /*internal error type 1 */
OCR_ERR_INTERNAL3, /*internal error type 1 */
OCR_ERR_INTERNAL4, /*internal error type 1 */
OCR_ERR_INTERNAL5, /*internal error type 1 */
OCR_ERR_INTERNAL6, /*internal error type 1 */
OCR_ERR_INTERNAL7, /*internal error type 1 */
OCR_ERR_INTERNAL8, /*internal error type 1 */
OCR_ERR_TIMEOUT /*timed out in comms */
}; /*for calls to ocr_error */
/**********************************************************************
* EFONT_DESC
* Description of one font.
* The information required is basically that used by RTF.
* The name may be either a valid font on the system or the empty string.
**********************************************************************/
typedef struct /*font description */
{
uinT16 language; /*default language */
uinT8 font_family; /*serif/not, fixed/not */
uinT8 char_set; /*character set standard */
uinT8 pitch; /*fixed or prop */
inT8 name[MAX_FONT_NAME + 1]; /*plain ascii name */
} EFONT_DESC; /*font description */
/**********************************************************************
* EOCR_DESC
* Description of the OCR engine provided at startup.
* The name and version may be reported to the user at some point.
* The fonts array should indicate the fonts that the OCR system
* can recognize.
**********************************************************************/
typedef struct /*startup info */
{
inT32 protocol; /*interface version */
uinT32 font_count; /*number of fonts */
uinT16 language; /*default language */
uinT16 name[MAX_OCR_NAME + 1]; /*name of engine */
/*version of engine */
uinT16 version[MAX_OCR_VERSION + 1];
EFONT_DESC fonts[1]; /*array of fonts */
} EOCR_DESC; /*startup info */
/**********************************************************************
* ESTRIP_DESC
* Description of the image strip as it is passed to the engine.
* The image is always 1 bit, with 1=black.
* The width is always a multiple of 32, so padding is always OK.
* The height of the full image is always a multiple of 32.
* The top y coordinate is 0, and increases down.
* The top leftmost pixel is in the most significant bit of the first byte.
**********************************************************************/
typedef struct /*bitmap strip */
{
inT16 x_size; /*width in pixels */
inT16 y_size; /*of full image */
inT16 strip_size; /*of this strip */
inT16 resolution; /*pixels per inch */
uinT8 data[8]; /*image data */
} ESTRIP_DESC; /*bitmap strip */
/**********************************************************************
* EANYCODE_CHAR
* Description of a single character. The character code is defined by
* the character set of the current font.
* Output text is sent as an array of these structures.
* Spaces and line endings in the output are represented in the
* structures of the surrounding characters. They are not directly
* represented as characters.
* The first character in a word has a positive value of blanks.
* Missing information should be set to the defaults in the comments.
* If word bounds are known, but not character bounds, then the top and
* bottom of each character should be those of the word. The left of the
* first and right of the last char in each word should be set. All other
* lefts and rights should be set to -1.
* If set, the values of right and bottom are left+width and top+height.
* Most of the members come directly from the parameters to ocr_append_char.
* The formatting member uses the enhancement parameter and combines the
* line direction stuff into the top 3 bits.
* The coding is 0=RL char, 1=LR char, 2=DR NL, 3=UL NL, 4=DR Para,
* 5=UL Para, 6=TB char, 7=BT char. API users do not need to know what
* the coding is, only that it is backwards compatible with the previous
* version.
**********************************************************************/
typedef struct /*single character */
{
// It should be noted that the format for char_code for version 2.0 and beyond is UTF8
// which means that ASCII characters will come out as one structure but other characters
// will be returned in two or more instances of this structure with a single byte of the
// UTF8 code in each, but each will have the same bounding box.
// Programs which want to handle languagues with different characters sets will need to
// handle extended characters appropriately, but *all* code needs to be prepared to
// receive UTF8 coded characters for characters such as bullet and fancy quotes.
uinT16 char_code; /*character itself */
inT16 left; /*of char (-1) */
inT16 right; /*of char (-1) */
inT16 top; /*of char (-1) */
inT16 bottom; /*of char (-1) */
inT16 font_index; /*what font (0) */
uinT8 confidence; /*0=perfect, 100=reject (0/100) */
uinT8 point_size; /*of char, 72=i inch, (10) */
inT8 blanks; /*no of spaces before this char (1) */
uinT8 formatting; /*char formatting (0) */
} EANYCODE_CHAR; /*single character */
/**********************************************************************
* ETEXT_DESC
* Description of the output of the OCR engine.
* This structure is used as both a progress monitor and the final
* output header, since it needs to be a valid progress monitor while
* the OCR engine is storing its output to shared memory.
* During progress, all the buffer info is -1.
* Progress starts at 0 and increases to 100 during OCR. No other constraint.
* Every progress callback, the OCR engine must set ocr_alive to 1.
* The HP side will set ocr_alive to 0. Repeated failure to reset
* to 1 indicates that the OCR engine is dead.
* If the cancel function is not null then it is called with the number of
* user words found. If it returns true then operation is cancelled.
**********************************************************************/
typedef bool (*CANCEL_FUNC)(void* cancel_this, int words);
class ETEXT_DESC /*output header */
{
public:
inT16 count; /*chars in this buffer(0) */
inT16 progress; /*percent complete increasing (0-100) */
inT8 more_to_come; /*true if not last */
volatile inT8 ocr_alive; /*ocr sets to 1, HP 0 */
inT8 err_code; /*for errcode use */
CANCEL_FUNC cancel; /*returns true to cancel */
void* cancel_this; /*this or other data for cancel*/
struct timeval end_time; /*time to stop. expected to be set only by call
to set_deadline_msecs()*/
EANYCODE_CHAR text[1]; /*character data */
ETEXT_DESC() : count(0), progress(0), more_to_come(0), ocr_alive(0),
err_code(0), cancel(NULL), cancel_this(NULL) {
end_time.tv_sec = 0;
end_time.tv_usec = 0;
}
// Sets the end time to be deadline_msecs milliseconds from now.
void set_deadline_msecs(inT32 deadline_msecs) {
gettimeofday(&end_time, NULL);
inT32 deadline_secs = deadline_msecs / 1000;
end_time.tv_sec += deadline_secs;
end_time.tv_usec += (deadline_msecs - deadline_secs * 1000) * 1000;
if (end_time.tv_usec > 1000000) {
end_time.tv_usec -= 1000000;
++end_time.tv_sec;
}
}
// Returns false if we've not passed the end_time, or have not set a deadline.
bool deadline_exceeded() const {
if (end_time.tv_sec == 0 && end_time.tv_usec == 0) return false;
struct timeval now;
gettimeofday(&now, NULL);
return (now.tv_sec > end_time.tv_sec || (now.tv_sec == end_time.tv_sec &&
now.tv_usec > end_time.tv_usec));
}
};
#endif
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