雷电芽衣andClaude
c864304695
A layered image editor for Linux and Omarchy, ported from Compositor (github.com/robbietilton/Compositor), whose Swift source is its specification. It reads and writes Compositor's .comp projects. Packages for Ubuntu, Fedora and Arch come from the release workflow; scripts/install/ holds one install script per distribution family, and flake.nix serves NixOS. Co-Authored-By: Claude <noreply@anthropic.com>
29 lines
1.1 KiB
C
29 lines
1.1 KiB
C
#include "LevelsPixels.h"
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#include <math.h>
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void levels_apply(uint8_t *pixels, size_t count, const float *tables) {
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for (size_t i=0; i<count; ++i) {
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uint8_t *p = pixels + i*4;
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float alpha = p[3];
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if (!alpha) continue;
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for (int channel=0; channel<3; ++channel) {
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float x = fminf(255, p[channel]*255.0f/alpha);
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int lo = (int)x, hi = lo < 255 ? lo+1 : 255;
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const float *table = tables + channel*256;
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float result = table[lo] + (table[hi]-table[lo])*(x-lo);
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p[channel] = (uint8_t)fminf(alpha, fmaxf(0, roundf(result*alpha)));
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}
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}
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}
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void levels_histogram(const uint8_t *pixels, const uint8_t *coverage, size_t count, double *bins) {
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for (size_t i=0; i<count; ++i) {
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const uint8_t *p = pixels+i*4;
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if (!p[3]) continue;
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double weight = p[3]/255.0 * (coverage ? coverage[i]/255.0 : 1);
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for (int channel=0; channel<3; ++channel) {
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int value = (int)fmin(255, round(p[channel]*255.0/p[3]));
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bins[(channel+1)*256+value] += weight;
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bins[value] += weight/3.0;
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}
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}
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}
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