Hi all,
In my Python application running on Raspberry Pi under Raspbian I use
Pygame to display some software-generated images via framebuffer. I don’t
need any input from mouse, keyboard or any other devices, all I need is a
convenient way of using framebuffer.
I initialize Pygame in the following way:
class FramebufferStaticImage(object):
black = (0, 0, 0)
white = (255, 255, 255)
_ENV_VAR_DISPLAY = "DISPLAY"
_instance = None
def __init__(self, log):
"Ininitializes a new pygame screen using the framebuffer"
# Based on "Python GUI in Linux frame buffer"
# http://www.karoltomala.com/blog/?p=679
if FramebufferStaticImage._instance != None:
raise Exception("No more than 1 instance of
FramebufferStaticImage is allowed!")
FramebufferStaticImage._instance = self
self._log = log
self._log.info("[fb_static_image] Init: entered")
self._screen = None
# Try ensure using framebuffer and not X11 display even if it exists
if self._ENV_VAR_DISPLAY in os.environ:
del os.environ[self._ENV_VAR_DISPLAY]
os.putenv('SDL_FBDEV', '/dev/fb0')
os.putenv('SDL_VIDEODRIVER', 'fbcon')
os.environ['SDL_NOMOUSE'] = '1'
#### os.putenv('SDL_NOMOUSE', '1')
self._log.debug("Current environment is: {env}", env = os.environ)
import pygame
pygame.display.init()
self._width = pygame.display.Info().current_w
self._height = pygame.display.Info().current_h
self._log.info("[fb_static_image] Framebuffer size: {width} x
{height}",
width = self._width, height = self._height)
self._screen = pygame.display.set_mode(
(self._width, self._height), pygame.FULLSCREEN)
# Clear the screen to start
self._screen.fill(self.black)
# Initialise font support
pygame.font.init()
# Render the screen
pygame.display.update()
self._log.info("[fb_static_image] Init: leaving")
Problem #1: I have mouse pointer at the top left corner of Pygame-drawn
images. I want mouse pointer to be hidden.
I know that I can disable mouse pointer using pygame.mouse.set_visible, but
here comes
Problem #2: I have to run my application with sudo in order for pygame to
not raise “unable to open a console terminal” exception. But I want to run
my application without root rights, because this increases my application’s
security.
There are some posts on forums that recommend setting SDL_NOMOUSE=1
environment variable before initializing pygame which should skip mouse
initialization and maybe make it possible to get rid of sudo, but this
doesn’t work for me: I still need to use sudo and mouse pointer is still
there.
If this makes any difference, I have no mouse or keyboard attached to the
Raspberry Pi, I connect to it using SSH.
I use
Pygame version 1.9.2~pre~r3348-2~bpo8+rpi1
libsdl-image1.2 version 1.2.12-5+b1
libsdl1.2debian version 1.2.15-10+rpi1
Does SDL_NOMOUSE work for anyone using recent Pygame versions?
Is it possible to skip mouse initialization in Pygame?
P.S. This question was originally posted on StackExchange
<https://raspberrypi.stackexchange.com/questions/69007/how-to-completely-disable-mouse-in-pygame>,
but it seems I chose the wrong section. For this reason or another, I
haven’t got any straight answer yet, so I write here and hope for the best
:)
