In "Playdate In C" documentation its definition is :-
typedef void LCDSpriteDrawFunction(LCDSprite* sprite, LCDRect bounds, uint8_t* frame, LCDRect drawrect);
In "pd_api_sprite.h" its definition is :-
typedef void LCDSpriteDrawFunction(LCDSprite* sprite, PDRect bounds, PDRect drawrect);