#ifndef PNM_IMAGE_H
#define PNM_IMAGE_H

/****************************************************************************
 * Image structures 
 */



typedef struct {
  int width,height;     /* dimensions */
  int stride;		/* width of image in memory */

  float *data;		/* data in latin reading order */
} image_t;

typedef struct {
  int width,height;     /* here, stride = width */
  
  float *c1;		/* R */
  float *c2;		/* G */
  float *c3;		/* B */
  
} color_image_t;

image_t *image_new(int width, int height);

image_t *image_cpy(image_t *src);

void image_delete(image_t *image);


color_image_t *color_image_new(int width, int height);

color_image_t *color_image_cpy(color_image_t *src);

void color_image_delete(color_image_t *image);



color_image_t *load_ppm(const char *fname);

typedef enum {
  CHANNEL_R, 
  CHANNEL_G, 
  CHANNEL_B
} ColorChannel; 

image_t *color_image_channel(const color_image_t *cim, ColorChannel channel);


#endif