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/* color test image generator
*
* (C) 2019 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <stdlib.h>
#include <stdint.h>
#include "../libsample/sample.h"
#include "color.h"
#define RAMP_WIDTH 0.0000002
static struct color_bar {
double amplitude, phase;
} color_bar[8] = {
{0.0, 0.0},
{0.336, 167.1},
{0.474, 283.5},
{0.443, 240.7},
{0.443, 60.7},
{0.474, 103.5},
{0.336, 347.1},
{0.0, 0.0},
};
int color_gen_line(sample_t *sample, double x, double samplerate, sample_t *color_u, sample_t *color_v, int v_polarity, double line_start, double line_end)
{
int b = 5;
double step = 1.0 / samplerate;
int i = 0;
double amplitude, Y, U, V, colorphase;
/* skip x to line_start */
while (x < line_start && x < line_end) {
i++;
x += step;
}
if (x >= line_end)
return i;
/* color */
Y = (1.0 - (double)b / 7.0) * 0.75;
amplitude = color_bar[b].amplitude;
if (v_polarity < 0)
colorphase = (360.0 - color_bar[b].phase) / 180.0 * M_PI;
else
colorphase = color_bar[b].phase / 180.0 * M_PI;
U = cos(colorphase) * amplitude;
V = sin(colorphase) * amplitude;
while (x < line_end) {
color_u[i] = U;
color_v[i] = V;
sample[i++] = Y;
x += step;
}
return i;
}
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