Initial import of sane-backends version 1.0.24-1.2

1 files changed, 154 insertions, 0 deletions

diff --git a/backend/gt68xx_mid.h b/backend/gt68xx_mid.h
new file mode 100644
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+++ b/backend/gt68xx_mid.h
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2002 Sergey Vlasov <vsu@altlinux.ru>
+   
+   This file is part of the SANE package.
+   
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+   
+   This program 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
+   General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+   
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+   
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+   
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+   
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+   
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice. 
+*/
+
+#ifndef GT68XX_MID_H
+#define GT68XX_MID_H
+
+/** @file
+ * @brief Image data unpacking.
+ */
+
+#include "gt68xx_low.h"
+#include "../include/sane/sane.h"
+
+typedef struct GT68xx_Delay_Buffer GT68xx_Delay_Buffer;
+typedef struct GT68xx_Line_Reader GT68xx_Line_Reader;
+
+struct GT68xx_Delay_Buffer
+{
+  SANE_Int line_count;
+  SANE_Int read_index;
+  SANE_Int write_index;
+  unsigned int **lines;
+  SANE_Byte *mem_block;
+};
+
+/**
+ * Object for reading image data line by line, with line distance correction.
+ *
+ * This object handles reading the image data from the scanner line by line and
+ * converting it to internal format.  Internally each image sample is
+ * represented as <code>unsigned int</code> value, scaled to 16-bit range
+ * (0-65535).  For color images the data for each primary color is stored as
+ * separate lines.
+ */
+struct GT68xx_Line_Reader
+{
+  GT68xx_Device *dev;			/**< Low-level interface object */
+  GT68xx_Scan_Parameters params;	/**< Scan parameters */
+
+#if 0
+  /** Number of bytes in the returned scanlines */
+  SANE_Int bytes_per_line;
+
+  /** Number of bytes per pixel in the returned scanlines */
+  SANE_Int bytes_per_pixel;
+#endif
+
+  /** Number of pixels in the returned scanlines */
+  SANE_Int pixels_per_line;
+
+  SANE_Byte *pixel_buffer;
+
+  GT68xx_Delay_Buffer r_delay;
+  GT68xx_Delay_Buffer g_delay;
+  GT68xx_Delay_Buffer b_delay;
+  SANE_Bool delays_initialized;
+
+    SANE_Status (*read) (GT68xx_Line_Reader * reader,
+			 unsigned int **buffer_pointers_return);
+};
+
+/**
+ * Create a new GT68xx_Line_Reader object.
+ *
+ * @param dev           The low-level scanner interface object.
+ * @param params        Scan parameters prepared by gt68xx_device_setup_scan().
+ * @param final_scan    SANE_TRUE for the final scan, SANE_FALSE for
+ *                      calibration scans.
+ * @param reader_return Location for the returned object.
+ *
+ * @return
+ * - SANE_STATUS_GOOD   - on success
+ * - SANE_STATUS_NO_MEM - cannot allocate memory for object or buffers
+ * - other error values - failure of some internal functions
+ */
+static SANE_Status
+gt68xx_line_reader_new (GT68xx_Device * dev,
+			GT68xx_Scan_Parameters * params,
+			SANE_Bool final_scan,
+			GT68xx_Line_Reader ** reader_return);
+
+/**
+ * Destroy the GT68xx_Line_Reader object.
+ *
+ * @param reader  The GT68xx_Line_Reader object to destroy.
+ */
+static SANE_Status gt68xx_line_reader_free (GT68xx_Line_Reader * reader);
+
+/**
+ * Read a scanline from the GT68xx_Line_Reader object.
+ *
+ * @param reader      The GT68xx_Line_Reader object.
+ * @param buffer_pointers_return Array of pointers to image lines (1 or 3
+ * elements)
+ *
+ * This function reads a full scanline from the device, unpacks it to internal
+ * buffers and returns pointer to these buffers in @a
+ * buffer_pointers_return[i].  For monochrome scan, only @a
+ * buffer_pointers_return[0] is filled; for color scan, elements 0, 1, 2 are
+ * filled with pointers to red, green, and blue data.  The returned pointers
+ * are valid until the next call to gt68xx_line_reader_read(), or until @a
+ * reader is destroyed.
+ *
+ * @return
+ * - SANE_STATUS_GOOD  - read completed successfully
+ * - other error value - an error occured
+ */
+static SANE_Status
+gt68xx_line_reader_read (GT68xx_Line_Reader * reader,
+			 unsigned int **buffer_pointers_return);
+
+#endif /* not GT68XX_MID_H */
+
+/* vim: set sw=2 cino=>2se-1sn-1s{s^-1st0(0u0 smarttab expandtab: */