/*
 * Copyright 2006 (C) George Peter Staplin
 *
 * This is roughly based on the NexTk ideas.  Rather than having the
 * structures stored in Tcl, we will store it in C structs that are malloced.
 *
 * Is there a better design for rendertree?  Right now rendertree results
 * in 2 copies of all data for performance of rotation, and scaling.
 */


typedef unsigned char byte;

/*
 * This is used with the nx_jpeg, nx_png, and nx_freetype code.
 */
struct nx_image {
 int version;
 int width;
 int height;
 byte *rgba;
 size_t imagesize;
};

struct nx_system {
 void *(*malloc) (size_t size);
 void (*out_of_memory) (char *forthis);
};

struct nx_event {
 /*
  * The first handler to return 1 (if any of them do in the list) 
  * is done processing the event, and it should not be passed further.
  * userdata is passed as the 3rd argument to the handler.
  */
 int (*event_handler) (struct nx_system *sys, struct nx_window *win, void *p);
 void *userdata;
 struct nx_event *next;
};

struct nx_window {
 struct nx_window *children;
 struct nx_window *parent;
 int width;
 int height;
 size_t imagesize;
 byte *rgba;
 byte flags;

 struct nx_event *buttonpress;
 struct nx_event *buttonrelease;
 struct nx_event *keypress;
 struct nx_event *keyrelease;
 struct nx_event *motion;

 struct nx_event *globalbuttonpress;
 struct nx_event *globalbuttonrelease;
 struct nx_event *globalkeypress;
 struct nx_event *globalkeyrelease;
 struct nx_event *globalmotion;

 struct nx_window *next; /* Used for the list of children */ 
};

struct nx_color {
 byte r, g, b, a;
};

int nx_rotate (struct nx_system *sys, struct nx_window *win, int degrees);
int nx_blend (struct nx_system *sys, struct nx_window *base, struct nx_window *overlay, int x, int y);
int nx_line (struct nx_system *sys, struct nx_window *win, struct nx_color *color, int x1, int y1, int x2, int y2);
int nx_rectangle (struct nx_system *sys, struct nx_window *win, struct nx_color *color, int x, int y, int width, int height);
int nx_setall (struct nx_system *sys, struct nx_window *win, struct nx_color *color);

/*
 * This iterates and destroys all children.
 * If win->parent is non-NULL then it removes win from the parent's list.
 *
 */
void nx_destroy_window (struct nx_system *sys, struct nx_window *win);
void nx_create_window (struct nx_system *sys, int width, int height);

/*
 * This puts win at the head of the win->parent->children list, and renders.
 */
void nx_raise_window (struct nx_system *sys, struct nx_window *win);
void nx_lower_window (struct nx_system *sys, struct nx_window *win);

void nx_render_tree (struct nx_system *sys);