kopia lustrzana https://gitlab.com/sane-project/backends
155 wiersze
5.1 KiB
C
155 wiersze
5.1 KiB
C
/* sane - Scanner Access Now Easy.
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Copyright (C) 2002 Sergey Vlasov <vsu@altlinux.ru>
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This file is part of the SANE package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, the authors of SANE give permission for
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additional uses of the libraries contained in this release of SANE.
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The exception is that, if you link a SANE library with other files
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to produce an executable, this does not by itself cause the
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resulting executable to be covered by the GNU General Public
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License. Your use of that executable is in no way restricted on
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account of linking the SANE library code into it.
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This exception does not, however, invalidate any other reasons why
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the executable file might be covered by the GNU General Public
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License.
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If you submit changes to SANE to the maintainers to be included in
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a subsequent release, you agree by submitting the changes that
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those changes may be distributed with this exception intact.
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If you write modifications of your own for SANE, it is your choice
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whether to permit this exception to apply to your modifications.
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If you do not wish that, delete this exception notice.
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*/
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#ifndef GT68XX_MID_H
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#define GT68XX_MID_H
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/** @file
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* @brief Image data unpacking.
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*/
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#include "gt68xx_low.h"
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#include "../include/sane/sane.h"
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typedef struct GT68xx_Delay_Buffer GT68xx_Delay_Buffer;
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typedef struct GT68xx_Line_Reader GT68xx_Line_Reader;
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struct GT68xx_Delay_Buffer
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{
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SANE_Int line_count;
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SANE_Int read_index;
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SANE_Int write_index;
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unsigned int **lines;
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SANE_Byte *mem_block;
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};
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/**
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* Object for reading image data line by line, with line distance correction.
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*
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* This object handles reading the image data from the scanner line by line and
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* converting it to internal format. Internally each image sample is
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* represented as <code>unsigned int</code> value, scaled to 16-bit range
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* (0-65535). For color images the data for each primary color is stored as
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* separate lines.
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*/
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struct GT68xx_Line_Reader
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{
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GT68xx_Device *dev; /**< Low-level interface object */
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GT68xx_Scan_Parameters params; /**< Scan parameters */
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#if 0
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/** Number of bytes in the returned scanlines */
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SANE_Int bytes_per_line;
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/** Number of bytes per pixel in the returned scanlines */
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SANE_Int bytes_per_pixel;
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#endif
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/** Number of pixels in the returned scanlines */
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SANE_Int pixels_per_line;
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SANE_Byte *pixel_buffer;
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GT68xx_Delay_Buffer r_delay;
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GT68xx_Delay_Buffer g_delay;
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GT68xx_Delay_Buffer b_delay;
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SANE_Bool delays_initialized;
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SANE_Status (*read) (GT68xx_Line_Reader * reader,
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unsigned int **buffer_pointers_return);
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};
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/**
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* Create a new GT68xx_Line_Reader object.
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*
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* @param dev The low-level scanner interface object.
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* @param params Scan parameters prepared by gt68xx_device_setup_scan().
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* @param final_scan SANE_TRUE for the final scan, SANE_FALSE for
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* calibration scans.
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* @param reader_return Location for the returned object.
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*
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_NO_MEM - cannot allocate memory for object or buffers
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* - other error values - failure of some internal functions
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*/
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static SANE_Status
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gt68xx_line_reader_new (GT68xx_Device * dev,
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GT68xx_Scan_Parameters * params,
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SANE_Bool final_scan,
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GT68xx_Line_Reader ** reader_return);
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/**
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* Destroy the GT68xx_Line_Reader object.
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*
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* @param reader The GT68xx_Line_Reader object to destroy.
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*/
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static SANE_Status gt68xx_line_reader_free (GT68xx_Line_Reader * reader);
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/**
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* Read a scanline from the GT68xx_Line_Reader object.
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*
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* @param reader The GT68xx_Line_Reader object.
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* @param buffer_pointers_return Array of pointers to image lines (1 or 3
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* elements)
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*
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* This function reads a full scanline from the device, unpacks it to internal
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* buffers and returns pointer to these buffers in @a
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* buffer_pointers_return[i]. For monochrome scan, only @a
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* buffer_pointers_return[0] is filled; for color scan, elements 0, 1, 2 are
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* filled with pointers to red, green, and blue data. The returned pointers
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* are valid until the next call to gt68xx_line_reader_read(), or until @a
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* reader is destroyed.
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*
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* @return
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* - SANE_STATUS_GOOD - read completed successfully
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* - other error value - an error occured
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*/
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static SANE_Status
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gt68xx_line_reader_read (GT68xx_Line_Reader * reader,
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unsigned int **buffer_pointers_return);
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#endif /* not GT68XX_MID_H */
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/* vim: set sw=2 cino=>2se-1sn-1s{s^-1st0(0u0 smarttab expandtab: */
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