// dvx_comp.h — Layer 3: Dirty rectangle compositor for DV/X GUI
#ifndef DVX_COMP_H
#define DVX_COMP_H

#include "dvxTypes.h"

// Initialize the dirty list
void dirtyListInit(DirtyListT *dl);

// Add a rectangle to the dirty list
void dirtyListAdd(DirtyListT *dl, int32_t x, int32_t y, int32_t w, int32_t h);

// Merge overlapping/adjacent dirty rects to reduce redraw work
void dirtyListMerge(DirtyListT *dl);

// Clear the dirty list
void dirtyListClear(DirtyListT *dl);

// Flush a single rectangle from backbuffer to LFB
void flushRect(DisplayT *d, const RectT *r);

// Intersect two rectangles, returns true if intersection is non-empty
bool rectIntersect(const RectT *a, const RectT *b, RectT *result);

// Test if a rectangle is empty (zero or negative area)
bool rectIsEmpty(const RectT *r);

#endif // DVX_COMP_H