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-rw-r--r--backend/genesys_conv_hlp.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/backend/genesys_conv_hlp.c b/backend/genesys_conv_hlp.c
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+/* 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;
+}
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