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examples/gamma-control: clamp values, default brightness to 1
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1 changed files with 8 additions and 3 deletions
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@ -115,7 +115,12 @@ static void fill_gamma_table(uint16_t *table, uint32_t ramp_size,
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uint16_t *b = table + 2 * ramp_size;
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for (uint32_t i = 0; i < ramp_size; ++i) {
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double val = (double)i / (ramp_size - 1);
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val = contrast * pow(val, 1.0 / gamma) + brightness;
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val = contrast * pow(val, 1.0 / gamma) + (1 - brightness);
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if (val > 1.0) {
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val = 1.0;
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} else if (val < 0.0) {
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val = 0.0;
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}
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r[i] = g[i] = b[i] = (uint16_t)(UINT16_MAX * val);
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}
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}
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@ -123,13 +128,13 @@ static void fill_gamma_table(uint16_t *table, uint32_t ramp_size,
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static const char usage[] = "usage: gamma-control [options]\n"
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" -h show this help message\n"
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" -c <value> set contrast (default: 1)\n"
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" -b <value> set brightness (default: 0)\n"
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" -b <value> set brightness (default: 1)\n"
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" -g <value> set gamma (default: 1)\n";
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int main(int argc, char *argv[]) {
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wl_list_init(&outputs);
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double contrast = 1, brightness = 0, gamma = 1;
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double contrast = 1, brightness = 1, gamma = 1;
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int opt;
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while ((opt = getopt(argc, argv, "hc:b:g:")) != -1) {
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switch (opt) {
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