77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* color test image generator
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*
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* (C) 2019 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <math.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "../libsample/sample.h"
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#include "ebu.h"
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#define RAMP_WIDTH 0.0000002
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static struct color_bar {
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double luminance, amplitude, phase;
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} color_bar[8] = {
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{1.0, 0.0, 0.0},
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{0.664, 0.336, 167.1},
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{0.526, 0.474, 283.5},
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{0.440, 0.443, 240.7},
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{0.310, 0.443, 60.7},
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{0.224, 0.474, 103.5},
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{0.086, 0.336, 347.1},
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{0.0, 0.0, 0.0},
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};
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int ebu_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)
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{
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int b = 5;
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double step = 1.0 / samplerate, render_end;
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int i = 0;
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double amplitude, Y, U, V, colorphase;
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/* skip x to line_start */
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while (x < line_start && x < line_end) {
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i++;
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x += step;
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}
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if (x >= line_end)
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return i;
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/* color */
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for (b = 0; b < 8; b++) {
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Y = color_bar[b].luminance;
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amplitude = color_bar[b].amplitude;
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if (v_polarity < 0)
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colorphase = (360.0 - color_bar[b].phase) / 180.0 * M_PI;
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else
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colorphase = color_bar[b].phase / 180.0 * M_PI;
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U = cos(colorphase) * amplitude / 2.0;
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V = sin(colorphase) * amplitude / 2.0;
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render_end = (line_end - line_start) / 8 * (b + 1) + line_start;
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while (x < render_end) {
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color_u[i] = U;
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color_v[i] = V;
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sample[i++] = Y;
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x += step;
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}
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}
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return i;
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}
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