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-rw-r--r--backend/genesys/conv.cpp238
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diff --git a/backend/genesys/conv.cpp b/backend/genesys/conv.cpp
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-/* sane - Scanner Access Now Easy.
-
- Copyright (C) 2005, 2006 Pierre Willenbrock <pierre@pirsoft.dnsalias.org>
- Copyright (C) 2010-2013 Stéphane Voltz <stef.dev@free.fr>
-
- 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.
-*/
-
-#define DEBUG_DECLARE_ONLY
-
-#include "conv.h"
-#include "sane/sanei_magic.h"
-
-namespace genesys {
-
-/**
- * uses the threshold/threshold_curve to control software binarization
- * This code was taken from the epjistsu backend by m. allan noah
- * @param dev device set up for the scan
- * @param src pointer to raw data
- * @param dst pointer where to store result
- * @param width width of the processed line
- * */
-void binarize_line(Genesys_Device* dev, std::uint8_t* src, std::uint8_t* dst, int width)
-{
- DBG_HELPER(dbg);
- int j, windowX, sum = 0;
- int thresh;
- int offset, addCol, dropCol;
- unsigned char mask;
-
- int x;
- std::uint8_t min, max;
-
- /* normalize line */
- min = 255;
- max = 0;
- for (x = 0; x < width; x++)
- {
- if (src[x] > max)
- {
- max = src[x];
- }
- if (src[x] < min)
- {
- min = src[x];
- }
- }
-
- /* safeguard against dark or white areas */
- if(min>80)
- min=0;
- if(max<80)
- max=255;
- for (x = 0; x < width; x++)
- {
- src[x] = ((src[x] - min) * 255) / (max - min);
- }
-
- /* ~1mm works best, but the window needs to have odd # of pixels */
- windowX = (6 * dev->settings.xres) / 150;
- if (!(windowX % 2))
- windowX++;
-
- /* second, prefill the sliding sum */
- for (j = 0; j < windowX; j++)
- sum += src[j];
-
- /* third, walk the input buffer, update the sliding sum, */
- /* determine threshold, output bits */
- for (j = 0; j < width; j++)
- {
- /* output image location */
- offset = j % 8;
- mask = 0x80 >> offset;
- thresh = dev->settings.threshold;
-
- /* move sum/update threshold only if there is a curve */
- if (dev->settings.threshold_curve)
- {
- addCol = j + windowX / 2;
- dropCol = addCol - windowX;
-
- if (dropCol >= 0 && addCol < width)
- {
- sum -= src[dropCol];
- sum += src[addCol];
- }
- thresh = dev->lineart_lut[sum / windowX];
- }
-
- /* use average to lookup threshold */
- if (src[j] > thresh)
- *dst &= ~mask; /* white */
- else
- *dst |= mask; /* black */
-
- if (offset == 7)
- dst++;
- }
-}
-
-/**
- * software lineart using data from a 8 bit gray scan. We assume true gray
- * or monochrome scan as input.
- */
-void genesys_gray_lineart(Genesys_Device* dev,
- std::uint8_t* src_data, std::uint8_t* dst_data,
- std::size_t pixels, std::size_t lines, std::uint8_t threshold)
-{
- DBG_HELPER(dbg);
- std::size_t y;
-
- DBG(DBG_io2, "%s: converting %zu lines of %zu pixels\n", __func__, lines, pixels);
- DBG(DBG_io2, "%s: threshold=%d\n", __func__, threshold);
-
- for (y = 0; y < lines; y++)
- {
- binarize_line (dev, src_data + y * pixels, dst_data, pixels);
- dst_data += pixels / 8;
- }
-}
-
-/** Look in image for likely left/right/bottom paper edges, then crop image.
- */
-void genesys_crop(Genesys_Scanner* s)
-{
- DBG_HELPER(dbg);
- Genesys_Device *dev = s->dev;
- int top = 0;
- int bottom = 0;
- int left = 0;
- int right = 0;
-
- // first find edges if any
- TIE(sanei_magic_findEdges(&s->params, dev->img_buffer.data(),
- dev->settings.xres, dev->settings.yres,
- &top, &bottom, &left, &right));
-
- DBG (DBG_io, "%s: t:%d b:%d l:%d r:%d\n", __func__, top, bottom, left,
- right);
-
- // now crop the image
- TIE(sanei_magic_crop (&(s->params), dev->img_buffer.data(), top, bottom, left, right));
-
- /* update counters to new image size */
- dev->total_bytes_to_read = s->params.bytes_per_line * s->params.lines;
-}
-
-/** Look in image for likely upper and left paper edges, then rotate
- * image so that upper left corner of paper is upper left of image.
- */
-void genesys_deskew(Genesys_Scanner *s, const Genesys_Sensor& sensor)
-{
- DBG_HELPER(dbg);
- Genesys_Device *dev = s->dev;
-
- int x = 0, y = 0, bg;
- double slope = 0;
-
- bg=0;
- if(s->params.format==SANE_FRAME_GRAY && s->params.depth == 1)
- {
- bg=0xff;
- }
- TIE(sanei_magic_findSkew(&s->params, dev->img_buffer.data(),
- sensor.optical_res, sensor.optical_res,
- &x, &y, &slope));
-
- DBG(DBG_info, "%s: slope=%f => %f\n", __func__, slope, slope * 180 / M_PI);
-
- // rotate image slope is in [-PI/2,PI/2]. Positive values rotate trigonometric direction wise
- TIE(sanei_magic_rotate(&s->params, dev->img_buffer.data(),
- x, y, slope, bg));
-}
-
-/** remove lone dots
- */
-void genesys_despeck(Genesys_Scanner* s)
-{
- DBG_HELPER(dbg);
- TIE(sanei_magic_despeck(&s->params, s->dev->img_buffer.data(), s->despeck));
-}
-
-/** Look if image needs rotation and apply it
- * */
-void genesys_derotate(Genesys_Scanner* s)
-{
- DBG_HELPER(dbg);
- int angle = 0;
-
- TIE(sanei_magic_findTurn(&s->params, s->dev->img_buffer.data(),
- s->resolution, s->resolution, &angle));
-
- // apply rotation angle found
- TIE(sanei_magic_turn(&s->params, s->dev->img_buffer.data(), angle));
-
- // update counters to new image size
- s->dev->total_bytes_to_read = s->params.bytes_per_line * s->params.lines;
-}
-
-} // namespace genesys
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