/usr/include/decodeqr.h is in libdecodeqr-dev 0.9.3-6.2+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// libdecodeqr.h --a part of libdecodeqr
//
// Copyright(C) 2007 NISHI Takao <zophos@koka-in.org>
// JMA (Japan Medical Association)
// NaCl (Network Applied Communication Laboratory Ltd.)
//
// This is free software with ABSOLUTELY NO WARRANTY.
// You can redistribute and/or modify it under the terms of LGPL.
//
// $Id: decodeqr.h 36 2007-02-21 23:22:03Z zophos $
//
#ifndef __QR_DECODER__
#define __QR_DECODER__
#include <cv.h>
#include "qrerror.h"
#include "qrtypes.h"
#define DEFAULT_ADAPTIVE_TH_SIZE 25
#define DEFAULT_ADAPTIVE_TH_DELTA 10
#ifdef __cplusplus
extern "C" {
#endif
/////////////////////////////////////////////////////////////////////////
//
// initializer
//
// ARGS: none
// RETURN:
// QrDecoderHandle handle
//
extern QrDecoderHandle qr_decoder_open();
/////////////////////////////////////////////////////////////////////////
//
// initializer with source image size
//
// ARGS:
// int width: pixel width of source image
// int height: pixel height of source image
// int depth: image depth (bit par pixel; use OpenCV IPL_DEPTH_*)
// int channel: number of image channel
//
// RETURN:
// QrDecoderHandle handle
//
// NOTE:
// 24-bit full color image has IPL_DEPTH_8U depth and 3 channels.
//
extern QrDecoderHandle qr_decoder_open_with_image_size(
int width,int height,int depth,int channel);
/////////////////////////////////////////////////////////////////////////
//
// finalizer
//
// ARGS:
// QrDecoderHandle decoder: handler
//
// RETURN: none
//
extern void qr_decoder_close(QrDecoderHandle decoder);
/////////////////////////////////////////////////////////////////////////
//
// get status
//
// ARGS:
// QrDecoderHandle decoder: handler
//
// RETURN: status code
//
extern short qr_decoder_get_status(QrDecoderHandle decoder);
/////////////////////////////////////////////////////////////////////////
//
// get working status
//
// ARGS:
// QrDecoderHandle decoder: handler
//
// RETURN: status code
//
extern int qr_decoder_is_busy(QrDecoderHandle decoder);
/////////////////////////////////////////////////////////////////////////
//
// set source image size
//
// ARGS:
// QrDecoderHandle decoder: handler
// int width: pixel width of source image
// int height: pixel height of source image
// int depth: image depth (bit par pixel; use OpenCV IPL_DEPTH_*)
// int channel: number of image channel
//
// RETURN:
// QrDecoderHandle handle
//
// NOTE:
// This method provide same function as qr_decoder_open_with_image_size().
//
extern QrDecoderHandle qr_decoder_set_image_size(
QrDecoderHandle decoder,int width,int height,int depth,int channel);
/////////////////////////////////////////////////////////////////////////
//
// preset gaven image as source image
//
// ARGS:
// QrDecoderHandle decoder: handler
// IplImage *src: source image
//
// RETURN:
// QrDecoderHandle handle
//
extern QrDecoderHandle qr_decoder_set_image_buffer(
QrDecoderHandle decoder,IplImage *src);
/////////////////////////////////////////////////////////////////////////
//
// get source image buffer
//
// ARGS:
// QrDecoderHandle decoder: handler
//
// RETURN:
// IplImage *: pointer to buffer source image|NULL
//
// NOTE:
// See OpenCV reference manual to access to IplImage *
//
extern IplImage *qr_decoder_get_image_buffer(QrDecoderHandle decoder);
extern IplImage *qr_decoder_get_transformed_image_buffer(
QrDecoderHandle decoder);
extern IplImage *qr_decoder_get_binarized_image_buffer(
QrDecoderHandle decoder);
extern IplImage *qr_decoder_get_tmp_image_buffer(
QrDecoderHandle decoder);
/////////////////////////////////////////////////////////////////////////
//
// decode preset source image
//
// ARGS:
// QrDecoderHandle decoder: handler
// int adaptive_th_size: value of AdaptiveThreshold size
// int adaptive_th_delta: value of AdaptiveThreshold delta
//
// RETURN:
// short: status code of decoder
//
// NOTE:
// On succeeded, status code has 0x2000.
// See qrtypes.h for details of status code.
//
// In case of adaptive_th_size=0, binarizing methods will be
// used cvThreshlod() instead of cvAdaptiveThreshold()
//
#ifdef __cplusplus
extern short qr_decoder_decode(QrDecoderHandle decoder,
int adaptive_th_size=
DEFAULT_ADAPTIVE_TH_SIZE,
int adaptive_th_delta=
DEFAULT_ADAPTIVE_TH_DELTA);
#else
extern short qr_decoder_decode(QrDecoderHandle decoder,
int adaptive_th_size,
int adaptive_th_delta);
#endif
/////////////////////////////////////////////////////////////////////////
//
// decode gaven image
//
// ARGS:
// QrDecoderHandle decoder: handler
// IplImage *src: image to decode
// int adaptive_th_size: value of AdaptiveThreshold size
// int adaptive_th_delta: value of AdaptiveThreshold delta
//
// RETURN:
// short: status code of decoder
//
#ifdef __cplusplus
extern short qr_decoder_decode_image(QrDecoderHandle decoder,
IplImage *src,
int adaptive_th_size=
DEFAULT_ADAPTIVE_TH_SIZE,
int adaptive_th_delta=
DEFAULT_ADAPTIVE_TH_DELTA);
#else
extern short qr_decoder_decode_image(QrDecoderHandle decoder,
IplImage *src,
int adaptive_th_size,
int adaptive_th_delta);
#endif
/////////////////////////////////////////////////////////////////////////
//
// get abstruction of decoded data
//
// ARGS:
// QrDecoderHandle decoder: handler
// QrCodeHeader *header: pointer to buffer of header
//
// RETURN:
// 1 (on success)||0 (on error)
//
extern int qr_decoder_get_header(QrDecoderHandle decoder,
QrCodeHeader *header);
/////////////////////////////////////////////////////////////////////////
//
// get decoded text data
//
// ARGS:
// QrDecoderHandle decoder: handler
// unsigned char *buf: pointer to buffer of header
// int buf_size: buffer size
//
// RETURN:
// copied data size||0 (on error)
//
// NOTE:
// The data DOES NOT TERMINATE with null.
// To get actual buffer size, use QrCodeHeader's .byte_size element.
//
extern int qr_decoder_get_body(QrDecoderHandle decoder,
unsigned char *buf,int buf_size);
/////////////////////////////////////////////////////////////////////////
//
// get vertexes of decoded code region
//
// ARGS:
// QrDecoderHandle decoder: handler
//
// RETURN:
// Pointer to CvPoint[4] which consist vertexes of code region
//
extern CvPoint *qr_decoder_get_coderegion_vertexes(QrDecoderHandle decoder);
/////////////////////////////////////////////////////////////////////////
//
// get Box array of decoded finder patterns
//
// ARGS:
// QrDecoderHandle decoder: handler
//
// RETURN:
// Pointer to CvBox2D[3] which consist boxes of finder pattern
//
extern CvBox2D *qr_decoder_get_finderpattern_boxes(QrDecoderHandle decoder);
/////////////////////////////////////////////////////////////////////////
//
// version information
//
extern char *qr_decoder_version();
extern char *qr_decoder_version_description();
extern char *qr_decoder_version_product();
extern int qr_decoder_version_major();
extern int qr_decoder_version_minor();
extern int qr_decoder_version_teeny();
extern char *qr_decoder_version_suffix();
extern char *qr_decoder_version_revision();
#ifdef __cplusplus
}
#endif
#endif
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