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frednora / rgb_blend.c
Created March 27, 2025 21:17 — forked from mattiasgustavsson/rgb_blend.c
// color1 and color2 are R4G4B4 12bit RGB color values, alpha is 0-255
uint16_t blend_12bit( uint16_t color1, uint16_t color2, uint8_t alpha ) {
uint64_t c1 = (uint64_t) color1;
uint64_t c2 = (uint64_t) color2;
uint64_t a = (uint64_t)( alpha >> 4 );
// bit magic to alpha blend R G B with single mul
c1 = ( c1 | ( c1 << 12 ) ) & 0x0f0f0f;
c2 = ( c2 | ( c2 << 12 ) ) & 0x0f0f0f;
uint32_t o = ( ( ( ( c2 - c1 ) * a ) >> 4 ) + c1 ) & 0x0f0f0f;
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frednora / ANSI.md
Created August 18, 2023 00:12 — forked from fnky/ANSI.md
ANSI Escape Codes

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

  • Ctrl-Key: ^[
  • Octal: \033
  • Unicode: \u001b
  • Hexadecimal: \x1B
  • Decimal: 27
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frednora / Memory, Cache, CPU optimization resources.md
Created November 17, 2020 19:32 — forked from ocornut/Memory, Cache, CPU optimization resources.md
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frednora / ABOUT.md
Created September 10, 2020 20:49 — forked from laobubu/ABOUT.md
A very simple HTTP server in C, for Unix, using fork()

Pico HTTP Server in C

This is a very simple HTTP server for Unix, using fork(). It's very easy to use

How to use

  1. include header httpd.h
  2. write your route method, handling requests.
  3. call serve_forever("12913") to start serving on port 12913
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frednora / lsniffer.c
Created July 19, 2020 01:18 — forked from fffaraz/lsniffer.c
Packet Sniffer Code in C using Linux Sockets | http://www.binarytides.com/packet-sniffer-code-c-linux/
/*
Packet sniffer using libpcap library
*/
#include<pcap.h>
#include<stdio.h>
#include<stdlib.h> // for exit()
#include<string.h> //for memset
#include<sys/socket.h>
#include<arpa/inet.h> // for inet_ntoa()
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frednora / rand.c
Created March 17, 2020 20:55 — forked from marcoscastro/rand.c
Exemplo que gera números aleatórios dados os limites superior e inferior.
// Exemplo de geração de números aleatórios
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
/*
A função gerar_numero() retorna um número aleatório
que pertence ao intervalo [lim_inf, lim_sup]