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/*
Copyright (C) 2009 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef RED_BITMAP_UTILS_RGB16
#define PIXEL rgb16_pixel_t
#define FNAME(name) name##_rgb16
#define GET_r(pix) (((pix) >> 10) & 0x1f)
#define GET_g(pix) (((pix) >> 5) & 0x1f)
#define GET_b(pix) ((pix) & 0x1f)
#endif
#if defined(RED_BITMAP_UTILS_RGB24) || defined(RED_BITMAP_UTILS_RGB32)
#define GET_r(pix) ((pix).r)
#define GET_g(pix) ((pix).g)
#define GET_b(pix) ((pix).b)
#endif
#ifdef RED_BITMAP_UTILS_RGB24
#define PIXEL rgb24_pixel_t
#define FNAME(name) name##_rgb24
#endif
#ifdef RED_BITMAP_UTILS_RGB32
#define PIXEL rgb32_pixel_t
#define FNAME(name) name##_rgb32
#endif
#define SAME_PIXEL_WEIGHT 0.5
#define NOT_CONTRAST_PIXELS_WEIGHT -0.25
#define CONTRAST_PIXELS_WEIGHT 1.0
#ifndef RED_BITMAP_UTILS_RGB16
#define CONTRAST_TH 60
#else
#define CONTRAST_TH 8
#endif
#define CONTRASTING(n) ((n) <= -CONTRAST_TH || (n) >= CONTRAST_TH)
#define SAMPLE_JUMP 15
static const double FNAME(PIX_PAIR_SCORE)[] = {
SAME_PIXEL_WEIGHT,
CONTRAST_PIXELS_WEIGHT,
NOT_CONTRAST_PIXELS_WEIGHT,
};
// return 0 - equal, 1 - for contrast, 2 for no contrast (PIX_PAIR_SCORE is defined accordingly)
static inline int FNAME(pixelcmp)(PIXEL p1, PIXEL p2)
{
int diff, any_different;
diff = GET_r(p1) - GET_r(p2);
any_different = diff;
if (CONTRASTING(diff)) {
return 1;
}
diff = GET_g(p1) - GET_g(p2);
any_different |= diff;
if (CONTRASTING(diff)) {
return 1;
}
diff = GET_b(p1) - GET_b(p2);
any_different |= diff;
if (CONTRASTING(diff)) {
return 1;
}
if (!any_different) {
return 0;
} else {
return 2;
}
}
static inline double FNAME(pixels_square_score)(PIXEL *line1, PIXEL *line2)
{
double ret;
int any_different = 0;
int cmp_res;
cmp_res = FNAME(pixelcmp)(*line1, line1[1]);
any_different |= cmp_res;
ret = FNAME(PIX_PAIR_SCORE)[cmp_res];
cmp_res = FNAME(pixelcmp)(*line1, *line2);
any_different |= cmp_res;
ret += FNAME(PIX_PAIR_SCORE)[cmp_res];
cmp_res = FNAME(pixelcmp)(*line1, line2[1]);
any_different |= cmp_res;
ret += FNAME(PIX_PAIR_SCORE)[cmp_res];
// ignore squares where all pixels are identical
if (!any_different) {
ret = 0;
}
return ret;
}
static void FNAME(compute_lines_gradual_score)(PIXEL *lines, int width, int num_lines,
double *o_samples_sum_score, int *o_num_samples)
{
int jump = (SAMPLE_JUMP % width) ? SAMPLE_JUMP : SAMPLE_JUMP - 1;
PIXEL *cur_pix = lines + width / 2;
PIXEL *bottom_pix;
PIXEL *last_line = lines + (num_lines - 1) * width;
if ((width <= 1) || (num_lines <= 1)) {
*o_num_samples = 1;
*o_samples_sum_score = 1.0;
return;
}
*o_samples_sum_score = 0;
*o_num_samples = 0;
while (cur_pix < last_line) {
if ((cur_pix + 1 - lines) % width == 0) { // last pixel in the row
cur_pix--; // jump is bigger than 1 so we will not enter endless loop
}
bottom_pix = cur_pix + width;
(*o_samples_sum_score) += FNAME(pixels_square_score)(cur_pix, bottom_pix);
(*o_num_samples)++;
cur_pix += jump;
}
(*o_num_samples) *= 3;
}
#undef PIXEL
#undef FNAME
#undef GET_r
#undef GET_g
#undef GET_b
#undef RED_BITMAP_UTILS_RGB16
#undef RED_BITMAP_UTILS_RGB24
#undef RED_BITMAP_UTILS_RGB32
#undef SAMPLE_JUMP
#undef CONTRAST_TH
#undef SAME_PIXEL_WEIGHT
#undef NOT_CONTRAST_PIXELS_WEIGHT
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