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  return (width * height / 8);
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  return (width * height / 8);
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}
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}
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enum colour_t
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enum colour_t
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{
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{
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  BLACK, WHITE, INVERT
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  BLACK,   /* and 0, invert 0 */
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  WHITE,   /* and 0, invert 1 */
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  OVERLAY, /* and 1, invert 0 */
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  INVERT,  /* and 1, invert 1 */
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};
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};
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class display_t
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class display_t
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{
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{
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public:
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public:
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  int16_t
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  int16_t
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  width ();
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  width ();
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  int16_t
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  int16_t
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  height ();
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  height ();
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- 
 
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  // common hardware reset .
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  void reset();
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  void
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  void
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  init ();
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  init ();
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  /// \brief Clear display to colour
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  /// \brief Clear display to colour
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  void
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  void
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  stopscroll (void);
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  stopscroll (void);
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  void
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  void
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  dim (uint8_t contrast);
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  dim (uint8_t contrast);
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- 
 
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  // set drawing mode
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  void setPixelMode(colour_t colour)
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  { m_colour = colour; }
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- 
 
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  void
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  void
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  drawPixel (int16_t x, int16_t y, colour_t color);
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  drawPixel (int16_t x, int16_t y, bool pixel);
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  void
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  void
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  drawLine (int16_t x1, int16_t y1, int16_t x2, int16_t y2, colour_t color);
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  drawLine (int16_t x1, int16_t y1, int16_t x2, int16_t y2, colour_t color);
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  void drawRectangle (int16_t x1, int16_t y1, int16_t x2, int16_t y2, colour_t color);
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  void drawRectangle (int16_t x1, int16_t y1, int16_t x2, int16_t y2, colour_t color);
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  /// \param string The characters to plot
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  /// \param string The characters to plot
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  /// \param length The length of the string
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  /// \param length The length of the string
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  /// \param colour
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  /// \param colour
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  void
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  void
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  printString (font_t &font, char const *string, uint16_t length,
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  printString (font_t &font, char const *string, uint16_t length,
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               colour_t colour);
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               colour_t colour=WHITE);
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  // scaled plotting
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  // scaled plotting
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  /// \param font The font to use
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  /// \param font The font to use
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  /// \param string The characters to plot
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  /// \param string The characters to plot
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  /// \param length The length of the string
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  /// \param length The length of the string
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  /// \param scale The scale factor is 256/scale so 256 is 1:1, 128 is twice the size
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  /// \param scale The scale factor is 256/scale so 256 is 1:1, 128 is twice the size
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  /// \param colour
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  /// \param colour
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  void
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  void
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  printScaledString (font_t &font, char const *string,
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  printScaledString (font_t &font, char const *string,
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                                  uint16_t length, uint16_t scale,
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                                  uint16_t length, uint16_t scale,
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                                  colour_t colour);
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                                  colour_t colour=WHITE);
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- 
 
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- 
 
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  static const uint8_t NO_DECIMAL = 255;
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 115 
 
102 
  void
 116 
  void
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  fontDigits (font_t &font, uint8_t digits, uint8_t dp_pos, int val);
 117 
  fontDigits (font_t &font, uint8_t digits, uint8_t dp_pos, int val, colour_t colour=WHITE);
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 118 
 
105 
  void
 119 
  void
106 
  fontSigDigits (font_t &font,uint8_t x, uint8_t y, bool right_justify, uint8_t dp_pos,
 120 
  fontSigDigits (font_t &font,uint8_t x, uint8_t y, bool right_justify, uint8_t dp_pos,
107 
                 int val);
 121 
                 int val, colour_t colour = WHITE);
108 
 
 122 
 
109 
  int
 123 
  int
110 
  cursor_x ()
 124 
  cursor_x ()
111 
  {
 125 
  {
112 
    return m_cursor_x;
 126 
    return m_cursor_x;
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 159 
 
146 
  int m_cursor_x;
 160 
  int m_cursor_x;
147 
  int m_cursor_y;
 161 
  int m_cursor_y;
148 
  int m_rotation;
 162 
  int m_rotation;
149 
 
 163 
 
- 
 
 164 
  // currently selected colour mode
- 
 
 165 
  colour_t m_colour;
- 
 
 166 
 
150 
  uint8_t *const m_data;
 167 
  uint8_t *const m_data;
151 
 
 168 
 
152 
};
 169 
};