diff options
Diffstat (limited to 'backend/genesys_conv.c')
| -rw-r--r-- | backend/genesys_conv.c | 478 |
1 files changed, 0 insertions, 478 deletions
diff --git a/backend/genesys_conv.c b/backend/genesys_conv.c deleted file mode 100644 index 61f466e..0000000 --- a/backend/genesys_conv.c +++ /dev/null @@ -1,478 +0,0 @@ -/* 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. -*/ - -/* - * Conversion filters for genesys backend - */ - - -/*8 bit*/ -#define SINGLE_BYTE -#define BYTES_PER_COMPONENT 1 -#define COMPONENT_TYPE uint8_t - -#define FUNC_NAME(f) f ## _8 - -#include "genesys_conv_hlp.c" - -#undef FUNC_NAME - -#undef COMPONENT_TYPE -#undef BYTES_PER_COMPONENT -#undef SINGLE_BYTE - -/*16 bit*/ -#define DOUBLE_BYTE -#define BYTES_PER_COMPONENT 2 -#define COMPONENT_TYPE uint16_t - -#define FUNC_NAME(f) f ## _16 - -#include "genesys_conv_hlp.c" - -#undef FUNC_NAME - -#undef COMPONENT_TYPE -#undef BYTES_PER_COMPONENT -#undef DOUBLE_BYTE - -static SANE_Status -genesys_reverse_bits( - uint8_t *src_data, - uint8_t *dst_data, - size_t bytes) -{ - size_t i; - for(i = 0; i < bytes; i++) { - *dst_data++ = ~ *src_data++; - } - return SANE_STATUS_GOOD; -} - -/** - * 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 - * */ -static SANE_Status -binarize_line(Genesys_Device * dev, uint8_t *src, uint8_t *dst, int width) -{ - int j, windowX, sum = 0; - int thresh; - int offset, addCol, dropCol; - unsigned char mask; - - int x; - 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++; - } - - return SANE_STATUS_GOOD; -} - -/** - * software lineart using data from a 8 bit gray scan. We assume true gray - * or monochrome scan as input. - */ -static SANE_Status -genesys_gray_lineart( - Genesys_Device *dev, - uint8_t *src_data, - uint8_t *dst_data, - size_t pixels, - size_t lines, - uint8_t threshold) -{ - size_t y; - - DBG (DBG_io2, "genesys_gray_lineart: converting %lu lines of %lu pixels\n", - (unsigned long)lines, (unsigned long)pixels); - DBG (DBG_io2, "genesys_gray_lineart: threshold=%d\n",threshold); - - for (y = 0; y < lines; y++) - { - binarize_line (dev, src_data + y * pixels, dst_data, pixels); - dst_data += pixels / 8; - } - return SANE_STATUS_GOOD; -} - -/** @brief shrink or grow scanned data to fit the final scan size - * This function shrinks the scanned data it the required resolution is lower than the hardware one, - * or grows it in case it is the opposite like when motor resolution is higher than - * sensor's one. - */ -static SANE_Status -genesys_shrink_lines_1 ( - uint8_t *src_data, - uint8_t *dst_data, - unsigned int lines, - unsigned int src_pixels, - unsigned int dst_pixels, - unsigned int channels) -{ - unsigned int dst_x, src_x, y, c, cnt; - unsigned int avg[3], val; - uint8_t *src = (uint8_t *) src_data; - uint8_t *dst = (uint8_t *) dst_data; - - /* choose between case where me must reduce or grow the scanned data */ - if (src_pixels > dst_pixels) - { - /* shrink data */ - /* TODO action must be taken at bit level, no bytes */ - src_pixels /= 8; - dst_pixels /= 8; - /*take first _byte_ */ - for (y = 0; y < lines; y++) - { - cnt = src_pixels / 2; - src_x = 0; - for (dst_x = 0; dst_x < dst_pixels; dst_x++) - { - while (cnt < src_pixels && src_x < src_pixels) - { - cnt += dst_pixels; - - for (c = 0; c < channels; c++) - avg[c] = *src++; - src_x++; - } - cnt -= src_pixels; - - for (c = 0; c < channels; c++) - *dst++ = avg[c]; - } - } - } - else - { - /* common case where y res is double x res */ - for (y = 0; y < lines; y++) - { - if (2 * src_pixels == dst_pixels) - { - /* double and interleave on line */ - for (c = 0; c < src_pixels/8; c++) - { - /* first 4 bits */ - val = 0; - val |= (*src & 0x80) >> 0; /* X___ ____ --> X___ ____ */ - val |= (*src & 0x80) >> 1; /* X___ ____ --> _X__ ____ */ - val |= (*src & 0x40) >> 1; /* _X__ ____ --> __X_ ____ */ - val |= (*src & 0x40) >> 2; /* _X__ ____ --> ___X ____ */ - val |= (*src & 0x20) >> 2; /* __X_ ____ --> ____ X___ */ - val |= (*src & 0x20) >> 3; /* __X_ ____ --> ____ _X__ */ - val |= (*src & 0x10) >> 3; /* ___X ____ --> ____ __X_ */ - val |= (*src & 0x10) >> 4; /* ___X ____ --> ____ ___X */ - *dst = val; - dst++; - - /* last for bits */ - val = 0; - val |= (*src & 0x08) << 4; /* ____ X___ --> X___ ____ */ - val |= (*src & 0x08) << 3; /* ____ X___ --> _X__ ____ */ - val |= (*src & 0x04) << 3; /* ____ _X__ --> __X_ ____ */ - val |= (*src & 0x04) << 2; /* ____ _X__ --> ___X ____ */ - val |= (*src & 0x02) << 2; /* ____ __X_ --> ____ X___ */ - val |= (*src & 0x02) << 1; /* ____ __X_ --> ____ _X__ */ - val |= (*src & 0x01) << 1; /* ____ ___X --> ____ __X_ */ - val |= (*src & 0x01) << 0; /* ____ ___X --> ____ ___X */ - *dst = val; - dst++; - src++; - } - } - else - { - /* TODO: since depth is 1, we must interpolate bit within bytes */ - DBG (DBG_warn, "%s: inaccurate bit expansion!\n", __func__); - cnt = dst_pixels / 2; - dst_x = 0; - for (src_x = 0; src_x < src_pixels; src_x++) - { - for (c = 0; c < channels; c++) - avg[c] = *src++; - while (cnt < dst_pixels && dst_x < dst_pixels) - { - cnt += src_pixels; - for (c = 0; c < channels; c++) - *dst++ = avg[c]; - dst_x++; - } - cnt -= dst_pixels; - } - } - } - } - - return SANE_STATUS_GOOD; -} - - -/** Look in image for likely left/right/bottom paper edges, then crop image. - * Since failing to crop isn't fatal, we always return SANE_STATUS_GOOD . - */ -static SANE_Status -genesys_crop(Genesys_Scanner *s) -{ - SANE_Status status; - Genesys_Device *dev = s->dev; - int top = 0; - int bottom = 0; - int left = 0; - int right = 0; - - DBG (DBG_proc, "%s: start\n", __func__); - - /* first find edges if any */ - status = sanei_magic_findEdges (&s->params, - dev->img_buffer, - dev->settings.xres, - dev->settings.yres, - &top, - &bottom, - &left, - &right); - if (status != SANE_STATUS_GOOD) - { - DBG (DBG_info, "%s: bad or no edges, bailing\n", __func__); - goto cleanup; - } - DBG (DBG_io, "%s: t:%d b:%d l:%d r:%d\n", __func__, top, bottom, left, - right); - - /* now crop the image */ - status = - sanei_magic_crop (&(s->params), dev->img_buffer, top, bottom, left, right); - if (status) - { - DBG (DBG_warn, "%s: failed to crop\n", __func__); - goto cleanup; - } - - /* update counters to new image size */ - dev->total_bytes_to_read = s->params.bytes_per_line * s->params.lines; - -cleanup: - DBG (DBG_proc, "%s: completed\n", __func__); - return SANE_STATUS_GOOD; -} - -/** 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. - * @return since failure doens't prevent scanning, we always return - * SANE_STATUS_GOOD - */ -static SANE_Status -genesys_deskew(Genesys_Scanner *s) -{ - SANE_Status status; - Genesys_Device *dev = s->dev; - - int x = 0, y = 0, bg; - double slope = 0; - - DBG (DBG_proc, "%s: start\n", __func__); - - bg=0; - if(s->params.format==SANE_FRAME_GRAY && s->params.depth == 1) - { - bg=0xff; - } - status = sanei_magic_findSkew (&s->params, - dev->img_buffer, - dev->sensor.optical_res, - dev->sensor.optical_res, - &x, - &y, - &slope); - if (status!=SANE_STATUS_GOOD) - { - DBG (DBG_error, "%s: bad findSkew, bailing\n", __func__); - return SANE_STATUS_GOOD; - } - DBG(DBG_info, "%s: slope=%f => %f\n",__func__,slope, (slope/M_PI_2)*90); - /* rotate image slope is in [-PI/2,PI/2] - * positive values rotate trigonometric direction wise */ - status = sanei_magic_rotate (&s->params, - dev->img_buffer, - x, - y, - slope, - bg); - if (status!=SANE_STATUS_GOOD) - { - DBG (DBG_error, "%s: rotate error: %s", __func__, sane_strstatus(status)); - } - - DBG (DBG_proc, "%s: completed\n", __func__); - return SANE_STATUS_GOOD; -} - -/** remove lone dots - * @return since failure doens't prevent scanning, we always return - * SANE_STATUS_GOOD - */ -static SANE_Status -genesys_despeck(Genesys_Scanner *s) -{ - if(sanei_magic_despeck(&s->params, - s->dev->img_buffer, - s->val[OPT_DESPECK].w)!=SANE_STATUS_GOOD) - { - DBG (DBG_error, "%s: bad despeck, bailing\n",__func__); - } - - return SANE_STATUS_GOOD; -} - -/** Look if image needs rotation and apply it - * */ -static SANE_Status -genesys_derotate (Genesys_Scanner * s) -{ - SANE_Status status; - int angle = 0; - int resolution = s->val[OPT_RESOLUTION].w; - - DBGSTART; - status = sanei_magic_findTurn (&s->params, - s->dev->img_buffer, - resolution, - resolution, - &angle); - - if (status) - { - DBG (DBG_warn, "%s: failed : %d\n", __func__, status); - DBGCOMPLETED; - return SANE_STATUS_GOOD; - } - - /* apply rotation angle found */ - status = sanei_magic_turn (&s->params, s->dev->img_buffer, angle); - if (status) - { - DBG (DBG_warn, "%s: failed : %d\n", __func__, status); - DBGCOMPLETED; - return SANE_STATUS_GOOD; - } - - /* update counters to new image size */ - s->dev->total_bytes_to_read = s->params.bytes_per_line * s->params.lines; - - DBGCOMPLETED; - return SANE_STATUS_GOOD; -} - -/* vim: set sw=2 cino=>2se-1sn-1s{s^-1st0(0u0 smarttab expandtab: */ |