Synopsis

typedef struct {
  long (*get_parameter)(CTL_GFX_DRIVER_s *, int);
  void (*draw_pixel)(CTL_GFX_DRIVER_s *, int , int);
  void (*draw_line)(CTL_GFX_DRIVER_s *, int , int , int , int);
  void (*fill_rectangle)(CTL_GFX_DRIVER_s *, int , int , int , int);
  void (*draw_circle)(CTL_GFX_DRIVER_s *, int , int , int);
  void (*fill_circle)(CTL_GFX_DRIVER_s *, int , int , int);
  void (*draw_glyph)(CTL_GFX_DRIVER_s *, int , int , const CTL_GFX_GLYPH_t *);
  void (*flush)(CTL_GFX_DRIVER_s *);
  unsigned long (*convert_pixel)(unsigned);
  void (*set_backlight)(CTL_GFX_DRIVER_s *, float);
  void (*set_contrast)(CTL_GFX_DRIVER_s *, float);
  int display_depth;
  int display_width;
  int display_height;
  int visible_width;
  int visible_height;
  unsigned default_background;
  unsigned default_foreground;
} CTL_GFX_DRIVER_t;

Description

CTL_GFX_DRIVER_t describes a graphics driver for an LCD or similar display.

extra

A place to store client-side data, not used by the graphics library.

get_parameter

Low-level method to inquire graphics controller capabilities.

draw_pixel

Method to draw a pixel at coordinate (x, y) using the active pen color.

draw_line

Method to draw a line from coordinate (x0, y0) to coordinate (x1, y1) using the active pen color. The driver implementation of this function does not need to distinguish horizontal and vertical lines, that's detected done by higher-level functions.

fill_rectangle

Method to fill a rectangle with top left (x0, y0) with width w and height h. The driver implementation can assume w and h and both non-zero and positive.

draw_circle

Method to draw a circle with center coordinate (x, y) and radius r in the active pen color.

fill_circle

Method to fill a circle with center coordinate (x, y) and radius r in the active pen color.

draw_glyph

Method to draw a raster glyph glyph at coordinate (x, y).

flush

Method to flush any outstanding graphics commands; may be zero to indicate that flushing is not supported by the driver.

convert_pixel

Method to convert a 24-bit RGB device-independent pixel to a controller-dependent device pixel.

set_backlight

Method to set the backlight level, 0 (dimmest) to 1 (brightest).

set_contrast

Method to set the contrast level, 0 (lowest) to 1 (highest).

depth

Cached color depth of display, in bits.