engine.h

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#pragma once
#include <pebble.h>
 
#include "ui/zone.h"


#ifndef ENGINE_SLOTS_MAX
#ifdef ENGINE_MAX_SLOTS
#define ENGINE_SLOTS_MAX ENGINE_MAX_SLOTS
#else
#define ENGINE_SLOTS_MAX 10
#endif
#endif

#ifndef ENGINE_MAX_SLOTS
#define ENGINE_MAX_SLOTS ENGINE_SLOTS_MAX
#endif
 
// a face that sets both names to different numbers would size its own loops by one and the engine's
// arrays by the other
#if ENGINE_MAX_SLOTS != ENGINE_SLOTS_MAX
#error "ENGINE_SLOTS_MAX and the old ENGINE_MAX_SLOTS are set to different values"
#endif
 
// the slot count and every slot index are a uint8_t, and the clamp on the count needs one value
// above the cap to compare against. at 255 the SDK's -Werror stops the build on a compare that
// can never be true
#if ENGINE_SLOTS_MAX < 1 || ENGINE_SLOTS_MAX > 254
#error "ENGINE_SLOTS_MAX, or the old ENGINE_MAX_SLOTS, has to be 1 to 254"
#endif

typedef struct
{
    GRect frame;                                                  
    void (*draw)(GContext *ctx, GRect bounds, const void *data);  
    const void *data;                                             
 
    const Zone *zone;                                             
    void (*text)(char *out, size_t n);                            
 
    uint32_t tags;                                                
} EngineSlot;

typedef uint8_t (*EngineBuild)(EngineSlot *out, uint8_t max, GRect bounds);

void engine_init(Window *window, EngineBuild build);

void engine_deinit(void);

void engine_rebuild(void);

void engine_mark_dirty(void);

void engine_mark_dirty_tags(uint32_t changed);