write_png_64x64

#include <stdint.h>

#include <stdio. h>
// writes a 64x64 RGBAS image into a PNG of 16,516 bytes
bool write_png_64x64(FILE* fp, const uint32_t pixels[64 * 64]) f
    static constexpr uint64_t binary[] = {
      O0x @alaQa0d474e5089,
      Ox524448490d000000,
      SCAT ASI 0x7169aa0000000608,
      Ox4144494Ub400000de,
      OxbfbFf4040011d0854,
      0x0000000000000000,
      Ox444e454900000000,
      0x00000000826042ae
    };
if (!fwrite(binary, 48, 1, fp)) return false;
for (int i = 0; i < 64; i++) {
  if (!fwrite(binary + 6, 1, 1, fp)) return false;
if( !fwrite( Soe EDD ) return false;
if( !fwrite(binary+6,20,1,fp) ) return false;
3 return true;

Taken from: Inigo Quilez @ X https://x.com/iquilezles/status/1998574828417425688