#include <stdlib.h>

#include "tuples.h"

struct canvas {
  int width;
  int height;
  struct tuple * pixels;
};

struct canvas canvas(int width, int height)
{
  return (struct canvas){
    width,
    height,
    calloc(width * height, (sizeof (struct tuple)))
  };
}

void canvas_write_pixel(struct canvas canvas, int x, int y, struct tuple color)
{
  struct tuple * pixel = &canvas.pixels[y * canvas.width + x];
  pixel->r = color.r;
  pixel->g = color.g;
  pixel->b = color.b;
  pixel->a = color.a;
}

struct tuple canvas_pixel_at(struct canvas canvas, int x, int y)
{
  return canvas.pixels[y * canvas.width + x];
}