#ifndef __BLITTER_H__
#define __BLITTER_H__

#include "types.h"
#include "screen.h"

#define WORD_ALIGNED_BYTE_POSITION(width, x, y) (((width * y + x) >> 3) & 0xfffe)
#define WORD_ALIGNED_BYTE_X(x) (((x) >> 3) & 0xfffe)

struct BlitAreaDetails {
  unsigned char *target;
  uint16_t drawAreaWidth;
  uint16_t nextBitplaneAdvance;
  uint8_t contiguousBitplanes;
};

struct BlitDrawLineSetup {
  uint16_t linePattern;
  unsigned char *target;

  int dx, dy, sx;
  int sud, sul, aul, accumulator, sign;
};

void blit_fillAreaDetailsFromScreenSetup(
  struct ScreenSetup *screenSetup,
  struct BlitAreaDetails *blitAreaDetails
);

void blit_calculateLineBlit(
  struct BlitDrawLineSetup *setup,
  uint16_t sx,
  uint16_t sy,
  uint16_t ex,
  uint16_t ey
);

void blit_drawLine(
  struct BlitAreaDetails *blitAreaDetails,
  struct BlitDrawLineSetup *setup,
  uint16_t sx,
  uint16_t sy,
  uint16_t ex,
  uint16_t ey,
  uint8_t color
);

void blit_copyOneToOne(
  struct BlitAreaDetails *source,
  struct BlitAreaDetails *target,
  uint16_t sx,
  uint16_t sy,
  uint16_t ex,
  uint16_t ey,
  uint16_t tx,
  uint16_t ty
);

void blit_howDoesFWMandLWMWork(
  struct BlitAreaDetails *source,
  struct BlitAreaDetails *target
);

struct BlitGenericData {
  int8_t shift, leftShift;
  uint16_t width, height;
  uint16_t heightStart, targetHeightStart;
  uint16_t wordSource, wordTarget;
  uint16_t firstWordMask, lastWordMask;
};

void blit_marquee(
  struct BlitAreaDetails *source,
  struct BlitGenericData *data,
  uint16_t splitPoint,
  uint16_t ex,
  uint16_t ey,
  uint16_t ty
);

#endif