vga_update interface facilitates the graphics console to
request screen redraw from its attached video device, which typically
happens on every frame update event. This interface must be implemented by
video devices that are attached to the graphics console. The implementation
should call functions in the gfx_con interface, e.g. a
sequence of put_block() calls followed by redraw(), which is implemented by
the graphics console.
The refresh method requests the video device to redraw dirty parts of the screen. The refresh_all method requests the video device to redraw the whole screen.
SIM_INTERFACE(vga_update) {
void (*refresh)(conf_object_t *NOTNULL obj);
void (*refresh_all)(conf_object_t *NOTNULL obj);
};
#define VGA_UPDATE_INTERFACE "vga_update"