scratch.c

struct imagebuffer *
new_imagebuffer(size_t width, size_t height)
{
  size_t size = width * height * color_type_to_bytes(DEFAULT_COLOR_TYPE);
  struct imagebuffer *imagebuffer = malloc(sizeof(struct imagebuffer) + size);

  *imagebuffer = (struct imagebuffer)
    {
      .width = width,
      .height = height,
      .color_type = DEFAULT_COLOR_TYPE,
      .pixel_size = color_type_to_bytes(DEFAULT_COLOR_TYPE),
      .buffer = imagebuffer->in_buffer
    };

  memset(imagebuffer->in_buffer, 0, size);

  return imagebuffer;
}

void
render_fill(struct asciibuffer *dest,
            const struct imagebuffer *src,
            const char fontname[])
{
  struct charset *font_charset = NULL;

  if (strcmp(fontname, "") == 0)
    {
      fprintf(stderr, "Warning: no fontname provided. Using fallback.\n");

      font_charset = charset_read_from_directory("./fonts/FixedsysExcelsior");
    }
  else
    {
      font_charset = charset_read_from_directory("./fonts/FixedsysExcelsior");
    }

  scale_bilinear((struct imagebuffer *) dest, src);

  struct cache cache[font_charset->n];

  for (size_t character = 0; character < font_charset->n; ++character)
    {
      // Calculate the arithmetic mean of the glyph
      cache[character].value = 0;
      
      for (size_t i = 0; i < font_charset->width * font_charset->height; ++i)
        {
          float dx = font_charset->characters[character].glyph[i] -
            cache[character].value;
          cache[character].value += dx / (i + 1);
        }

      cache[character].character =
        font_charset->characters[character].character;
    }

  qsort(cache, font_charset->n, sizeof(*cache), cmp_cache);

  for (size_t i = 0; i < dest->width; ++i)
    {
      for (size_t j = 0; j < dest->height; ++j)
        {
          for (size_t k = 0; k < LENGTH(cache); ++k)
            {
              if (*index_gray((struct imagebuffer *) dest, i, j) < cache[k].value)
                {
                  *index_gray((struct imagebuffer *) dest, i, j) = cache[k].character;
                  break;
                }
            }
        }
    }

  free_charset(font_charset);
}