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//------------------------------------------------------------------------
// Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
//
// 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
//------------------------------------------------------------------------
#ifndef _ZBAR_PROCESSOR_H_
#define _ZBAR_PROCESSOR_H_
/// @file
/// Processor C++ wrapper
#ifndef _ZBAR_H_
#error "include zbar.h in your application, **not** zbar/Processor.h"
#endif
#include "Exception.h"
#include "Image.h"
namespace zbar
{
/// high-level self-contained image processor.
/// processes video and images for barcodes, optionally displaying
/// images to a library owned output window
class Processor
{
public:
/// value to pass for no timeout.
static const int FOREVER = -1;
/// constructor.
Processor(bool threaded = true, const char *video_device = "",
bool enable_display = true)
{
_processor = zbar_processor_create(threaded);
if (!_processor)
throw std::bad_alloc();
init(video_device, enable_display);
}
~Processor()
{
zbar_processor_destroy(_processor);
}
/// cast to C processor object.
operator zbar_processor_t *()
{
return (_processor);
}
/// opens a video input device and/or prepares to display output.
/// see zbar_processor_init()
void init(const char *video_device = "", bool enable_display = true)
{
if (zbar_processor_init(_processor, video_device, enable_display))
throw_exception(_processor);
}
/// setup result handler callback.
/// see zbar_processor_set_data_handler()
void set_handler(Image::Handler &handler)
{
zbar_processor_set_data_handler(_processor, handler, &handler);
}
/// set config for indicated symbology (0 for all) to specified value.
/// @see zbar_processor_set_config()
/// @since 0.4
int set_config(zbar_symbol_type_t symbology, zbar_config_t config,
int value)
{
return (
zbar_processor_set_config(_processor, symbology, config, value));
}
/// set config parsed from configuration string.
/// @see zbar_processor_parse_config()
/// @since 0.4
int set_config(std::string cfgstr)
{
return (zbar_processor_parse_config(_processor, cfgstr.c_str()));
}
/// retrieve the current state of the output window.
/// see zbar_processor_is_visible()
bool is_visible()
{
int rc = zbar_processor_is_visible(_processor);
if (rc < 0)
throw_exception(_processor);
return (rc != 0);
}
/// show or hide the display window owned by the library.
/// see zbar_processor_set_visible()
void set_visible(bool visible = true)
{
if (zbar_processor_set_visible(_processor, visible) < 0)
throw_exception(_processor);
}
/// control the processor in free running video mode.
/// see zbar_processor_set_active()
void set_active(bool active = true)
{
if (zbar_processor_set_active(_processor, active) < 0)
throw_exception(_processor);
}
/// retrieve decode results for last scanned image.
/// @see zbar_processor_get_results()
/// @since 0.10
const SymbolSet get_results() const
{
return (SymbolSet(zbar_processor_get_results(_processor)));
}
/// wait for input to the display window from the user.
/// see zbar_processor_user_wait()
int user_wait(int timeout = FOREVER)
{
int rc = zbar_processor_user_wait(_processor, timeout);
if (rc < 0)
throw_exception(_processor);
return (rc);
}
/// process from the video stream until a result is available.
/// see zbar_process_one()
void process_one(int timeout = FOREVER)
{
if (zbar_process_one(_processor, timeout) < 0)
throw_exception(_processor);
}
/// process the provided image for barcodes.
/// see zbar_process_image()
void process_image(Image &image)
{
if (zbar_process_image(_processor, image) < 0)
throw_exception(_processor);
}
/// process the provided image for barcodes.
/// see zbar_process_image()
Processor &operator<<(Image &image)
{
process_image(image);
return (*this);
}
/// force specific input and output formats for debug/testing.
/// see zbar_processor_force_format()
void force_format(unsigned long input_format, unsigned long output_format)
{
if (zbar_processor_force_format(_processor, input_format,
output_format))
throw_exception(_processor);
}
/// force specific input and output formats for debug/testing.
/// see zbar_processor_force_format()
void force_format(std::string &input_format, std::string &output_format)
{
unsigned long ifourcc = zbar_fourcc_parse(input_format.c_str());
unsigned long ofourcc = zbar_fourcc_parse(output_format.c_str());
if (zbar_processor_force_format(_processor, ifourcc, ofourcc))
throw_exception(_processor);
}
/// request a preferred size for the video image from the device.
/// see zbar_processor_request_size()
/// @since 0.6
void request_size(int width, int height)
{
zbar_processor_request_size(_processor, width, height);
}
/// request a preferred driver interface version for debug/testing.
/// see zbar_processor_request_interface()
/// @since 0.6
void request_interface(int version)
{
zbar_processor_request_interface(_processor, version);
}
/// request a preferred I/O mode for debug/testing.
/// see zbar_processor_request_iomode()
/// @since 0.7
void request_iomode(int iomode)
{
if (zbar_processor_request_iomode(_processor, iomode))
throw_exception(_processor);
}
private:
zbar_processor_t *_processor;
};
} // namespace zbar
#endif
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