OffScreen.hh

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#ifndef COSA_CANVAS_OFFSCREEN_HH
#define COSA_CANVAS_OFFSCREEN_HH

#include "Cosa/Types.h"

template<uint16_t width, uint16_t height>
class OffScreen : public Canvas {
public:
  OffScreen() : Canvas(width, height) {}

  uint8_t* bitmap()
  {
    return (m_bitmap);
  }

  virtual bool begin()
  {
    fill_screen();
    return (true);
  }

  virtual void draw_pixel(uint16_t x, uint16_t y)
  {
    if (UNLIKELY((x > WIDTH) || (y > HEIGHT))) return;
    uint8_t* bp = &m_bitmap[((y >> 3) * WIDTH) + x];
    uint8_t pos = (y & 0x07);
    if (get_pen_color().rgb == Canvas::BLACK)
      *bp |= (1 << pos);
    else
      *bp &= ~(1 << pos);
  }

  virtual void fill_screen()
  {
    memset(m_bitmap, (get_canvas_color().rgb == Canvas::BLACK), COUNT);
  }

  virtual bool end()
  {
    return (true);
  }

private:
  static const uint16_t COUNT = (width * height) / CHARBITS;
  uint8_t m_bitmap[COUNT];
};

#endif