files.c


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/* file-handler.c
 * Created: 2023-08-25
 * Author: Aryadev Chavali
 * Description: Implementations of writing and loading state->from files
 */

#include <stdio.h>
#include <string.h>

#include <stb/stb_image_write.h>

#include "./lib.h"

#define CHUNK_SIZE 1024

bool write_to_png(state_t *state, const char *filepath)
{
  unsigned char *image_data =
      calloc(3 * state->dwidth * state->dwidth, sizeof(*image_data));

  size_t image_ptr = 0;

  for (size_t i = 0; i < state->dwidth; ++i)
    for (size_t j = 0; j < state->dwidth; ++j, image_ptr += 3)
    {
      unsigned char colour[3] = {0};
      uint64_t sandpile       = state->data[(i * state->dwidth) + j];
      if (sandpile == 0)
        colour[0] = colour[1] = colour[2] = 0;
      else if (sandpile == 1)
        colour[0] = colour[2] = 255;
      else if (sandpile == 2)
      {
        colour[0] = 255;
        colour[1] = colour[2] = 20;
      }
      else if (sandpile == 3)
      {
        colour[2] = 255;
        colour[0] = colour[1] = 20;
      }

      memcpy(image_data + image_ptr, colour, sizeof(*colour) * 3);
    }

  stbi_write_png(filepath, state->dwidth, state->dwidth, 3, image_data,
                 3 * state->dwidth);
  free(image_data);
  return true;
}