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render: dim and brighten using linear rgb interpolation

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Adds setting tweak.dim-amount, similar to bold-text-in-bright-amount.

Closes #2006
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Sam McCall 2025-03-22 20:11:23 +01:00 • committed by Daniel Eklöf
parent 5f72f51ae8
commit 663c9082db
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7 changed files with 51 additions and 66 deletions
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35
hsl.c
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@ -2,41 +2,6 @@
#include <math.h>
#include "util.h"
void
rgb_to_hsl(uint32_t rgb, int *hue, int *sat, int *lum)
{
double r = (double)((rgb >> 16) & 0xff) / 255.;
double g = (double)((rgb >> 8) & 0xff) / 255.;
double b = (double)((rgb >> 0) & 0xff) / 255.;
double x_max = max(max(r, g), b);
double x_min = min(min(r, g), b);
double V = x_max;
double C = x_max - x_min;
double L = (x_max + x_min) / 2.;
*lum = 100 * L;
if (C == 0.0)
*hue = 0;
else if (V == r)
*hue = 60. * (0. + (g - b) / C);
else if (V == g)
*hue = 60. * (2. + (b - r) / C);
else if (V == b)
*hue = 60. * (4. + (r - g) / C);
if (*hue < 0)
*hue += 360;
double S = C == 0.0
? 0
: C / (1. - fabs(2. * L - 1.));
*sat = 100 * S;
}
uint32_t
hsl_to_rgb(int hue, int sat, int lum)
{