diff options
author | Jörg Frings-Fürst <debian@jff-webhosting.net> | 2014-10-06 14:00:40 +0200 |
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committer | Jörg Frings-Fürst <debian@jff-webhosting.net> | 2014-10-06 14:00:40 +0200 |
commit | 6e9c41a892ed0e0da326e0278b3221ce3f5713b8 (patch) | |
tree | 2e301d871bbeeb44aa57ff9cc070fcf3be484487 /backend/genesys_conv_hlp.c |
Initial import of sane-backends version 1.0.24-1.2
Diffstat (limited to 'backend/genesys_conv_hlp.c')
-rw-r--r-- | backend/genesys_conv_hlp.c | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/backend/genesys_conv_hlp.c b/backend/genesys_conv_hlp.c new file mode 100644 index 0000000..cae4116 --- /dev/null +++ b/backend/genesys_conv_hlp.c @@ -0,0 +1,345 @@ +/* sane - Scanner Access Now Easy. + + Copyright (C) 2005 Pierre Willenbrock <pierre@pirsoft.dnsalias.org> + + 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 + */ + +static SANE_Status +FUNC_NAME(genesys_reorder_components_cis) ( + uint8_t *src_data, + uint8_t *dst_data, + unsigned int lines, + unsigned int pixels) +{ + unsigned int x, y; + uint8_t *src[3]; + uint8_t *dst = dst_data; + unsigned int rest = pixels * 2 * BYTES_PER_COMPONENT; + + src[0] = src_data + pixels * BYTES_PER_COMPONENT * 0; + src[1] = src_data + pixels * BYTES_PER_COMPONENT * 1; + src[2] = src_data + pixels * BYTES_PER_COMPONENT * 2; + + for(y = 0; y < lines; y++) { + for(x = 0; x < pixels; x++) { + +#ifndef DOUBLE_BYTE + *dst++ = *src[0]++; + *dst++ = *src[1]++; + *dst++ = *src[2]++; +#else +# ifndef WORDS_BIGENDIAN + *dst++ = *src[0]++; + *dst++ = *src[0]++; + *dst++ = *src[1]++; + *dst++ = *src[1]++; + *dst++ = *src[2]++; + *dst++ = *src[2]++; +# else + *dst++ = src[0][1]; + *dst++ = src[0][0]; + *dst++ = src[1][1]; + *dst++ = src[1][0]; + *dst++ = src[2][1]; + *dst++ = src[2][0]; + src[0] += 2; + src[1] += 2; + src[2] += 2; +# endif +#endif + } + + src[0] += rest; + src[1] += rest; + src[2] += rest; + } + return SANE_STATUS_GOOD; +} + +static SANE_Status +FUNC_NAME(genesys_reorder_components_cis_bgr) ( + uint8_t *src_data, + uint8_t *dst_data, + unsigned int lines, + unsigned int pixels) +{ + unsigned int x, y; + uint8_t *src[3]; + uint8_t *dst = dst_data; + unsigned int rest = pixels * 2 * BYTES_PER_COMPONENT; + + src[0] = src_data + pixels * BYTES_PER_COMPONENT * 0; + src[1] = src_data + pixels * BYTES_PER_COMPONENT * 1; + src[2] = src_data + pixels * BYTES_PER_COMPONENT * 2; + + for(y = 0; y < lines; y++) { + for(x = 0; x < pixels; x++) { +#ifndef DOUBLE_BYTE + *dst++ = *src[2]++; + *dst++ = *src[1]++; + *dst++ = *src[0]++; +#else +# ifndef WORDS_BIGENDIAN + *dst++ = *src[2]++; + *dst++ = *src[2]++; + *dst++ = *src[1]++; + *dst++ = *src[1]++; + *dst++ = *src[0]++; + *dst++ = *src[0]++; +# else + *dst++ = src[2][1]; + *dst++ = src[2][0]; + *dst++ = src[1][1]; + *dst++ = src[1][0]; + *dst++ = src[0][1]; + *dst++ = src[0][0]; + src[0] += 2; + src[1] += 2; + src[2] += 2; +# endif +#endif + } + + src[0] += rest; + src[1] += rest; + src[2] += rest; + } + return SANE_STATUS_GOOD; +} + +static SANE_Status +FUNC_NAME(genesys_reorder_components_bgr) ( + uint8_t *src_data, + uint8_t *dst_data, + unsigned int lines, + unsigned int pixels) +{ + unsigned int c; + uint8_t *src = src_data; + uint8_t *dst = dst_data; + + for(c = 0; c < lines * pixels; c++) { + +#ifndef DOUBLE_BYTE + *dst++ = src[2]; + *dst++ = src[1]; + *dst++ = src[0]; + src += 3; +#else +# ifndef WORDS_BIGENDIAN + *dst++ = src[2 * 2 + 0]; + *dst++ = src[2 * 2 + 1]; + *dst++ = src[1 * 2 + 0]; + *dst++ = src[1 * 2 + 1]; + *dst++ = src[0 * 2 + 0]; + *dst++ = src[0 * 2 + 1]; +# else + *dst++ = src[2 * 2 + 1]; + *dst++ = src[2 * 2 + 0]; + *dst++ = src[1 * 2 + 1]; + *dst++ = src[1 * 2 + 0]; + *dst++ = src[0 * 2 + 1]; + *dst++ = src[0 * 2 + 0]; +# endif + src += 3 * 2; +#endif + + } + return SANE_STATUS_GOOD; +} + +#if defined(DOUBLE_BYTE) && defined(WORDS_BIGENDIAN) +static SANE_Status +FUNC_NAME(genesys_reorder_components_endian) ( + uint8_t *src_data, + uint8_t *dst_data, + unsigned int lines, + unsigned int pixels, + unsigned int channels) +{ + unsigned int c; + uint8_t *src = src_data; + uint8_t *dst = dst_data; + + for(c = 0; c < lines * pixels * channels; c++) { + *dst++ = src[1]; + *dst++ = src[0]; + src += 2; + } +return SANE_STATUS_GOOD; +} +#endif /*defined(DOUBLE_BYTE) && defined(WORDS_BIGENDIAN)*/ + + +static SANE_Status +FUNC_NAME(genesys_reverse_ccd) ( + uint8_t *src_data, + uint8_t *dst_data, + unsigned int lines, + unsigned int components_per_line, + unsigned int *ccd_shift, + unsigned int component_count) +{ + unsigned int x, y, c; + COMPONENT_TYPE *src = (COMPONENT_TYPE *)src_data; + COMPONENT_TYPE *dst = (COMPONENT_TYPE *)dst_data; + COMPONENT_TYPE *srcp; + COMPONENT_TYPE *dstp; + unsigned int pitch = components_per_line; + unsigned int ccd_shift_pitch[12]; + unsigned int *csp; + + for (c = 0; c < component_count; c++) + ccd_shift_pitch[c] = ccd_shift[c] * pitch; + +/* + * cache efficiency: + we are processing a single line component_count times, so it should fit + into the cpu cache for maximum efficiency. our lines take + maximum 252kb(3 channels, 16bit, 2400dpi, full gl841 shading range) + * instruction efficiency: + the innermost loop runs long and consists of 3 adds, one compare, + 2 derefences. + */ +/* + for (y = 0; y < lines; y++) { + csp = ccd_shift_pitch; + for (c = 0; c < component_count; c++) { + srcp = src + c + *csp++; + dstp = dst + c; + for (x = 0; x < pitch; x += component_count) { + *dstp = *srcp; + srcp += component_count; + dstp += component_count; + } + } + dst += pitch; + src += pitch; + } + */ +/* + * cache efficency: + here only line_dist_pitch needs to stay in cache. 12*4 = 48 bytes + * instruction efficiency: + we have a short running inner loop, consisting of 4 incs, 2 compare, 1 add, + 2 dereference and 1 indexed dereference. + the enclosing loop is long running, consisting of 1 add, 1 compare. + */ + srcp = src; + dstp = dst; + for (y = 0; y < lines; y++) { + for (x = 0; x < pitch; x += component_count) { + csp = ccd_shift_pitch; + for (c = 0; c < component_count && c + x < pitch; c++) { + *dstp = srcp[*csp++]; + dstp++; + srcp++; + } + } + } + return SANE_STATUS_GOOD; +} + +static SANE_Status +FUNC_NAME(genesys_shrink_lines) ( + 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]; + unsigned int count; + COMPONENT_TYPE *src = (COMPONENT_TYPE *)src_data; + COMPONENT_TYPE *dst = (COMPONENT_TYPE *)dst_data; + + if (src_pixels > dst_pixels) { +/*average*/ + for (c = 0; c < channels; c++) + avg[c] = 0; + for(y = 0; y < lines; y++) { + cnt = src_pixels / 2; + src_x = 0; + for (dst_x = 0; dst_x < dst_pixels; dst_x++) { + count = 0; + while (cnt < src_pixels && src_x < src_pixels) { + cnt += dst_pixels; + + for (c = 0; c < channels; c++) + avg[c] += *src++; + src_x++; + count++; + } + cnt -= src_pixels; + + for (c = 0; c < channels; c++) { + *dst++ = avg[c] / count; + avg[c] = 0; + } + } + } + } else { +/*interpolate. copy pixels*/ + for(y = 0; y < lines; y++) { + 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 || src_x + 1 == src_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; +} |