/usr/share/kivy-examples/canvas/clearbuffers.py is in python-kivy-examples 1.8.0+dfsg-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from kivy.graphics import Color, Rectangle, Canvas, ClearBuffers, ClearColor
from kivy.graphics.fbo import Fbo
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import ObjectProperty, NumericProperty
class FboFloatLayout(FloatLayout):
texture = ObjectProperty(None, allownone=True)
alpha = NumericProperty(1)
def __init__(self, **kwargs):
self.canvas = Canvas()
with self.canvas:
self.fbo = Fbo(size=self.size)
self.fbo_color = Color(1, 1, 1, 1)
self.fbo_rect = Rectangle()
with self.fbo:
ClearColor(0,0,0,0)
ClearBuffers()
# wait that all the instructions are in the canvas to set texture
self.texture = self.fbo.texture
super(FboFloatLayout, self).__init__(**kwargs)
def add_widget(self, *largs):
# trick to attach graphics instructino to fbo instead of canvas
canvas = self.canvas
self.canvas = self.fbo
ret = super(FboFloatLayout, self).add_widget(*largs)
self.canvas = canvas
return ret
def remove_widget(self, *largs):
canvas = self.canvas
self.canvas = self.fbo
super(FboFloatLayout, self).remove_widget(*largs)
self.canvas = canvas
def on_size(self, instance, value):
self.fbo.size = value
self.texture = self.fbo.texture
self.fbo_rect.size = value
def on_pos(self, instance, value):
self.fbo_rect.pos = value
def on_texture(self, instance, value):
self.fbo_rect.texture = value
def on_alpha(self, instance, value):
self.fbo_color.rgba = (1, 1, 1, value)
from kivy.app import App
from kivy.core.window import Window
from kivy.animation import Animation
from kivy.factory import Factory as F
class ScreenLayerApp(App):
def build(self):
f = FboFloatLayout()
b = F.Button(text="FBO", size_hint=(None, None))
f.add_widget(b)
def anim_btn(*args):
Animation(x=f.width-b.width).start(b)
b.bind(on_press=anim_btn)
#before this or calback instruction was only way...
#so no way to avoid going into python instead of stayingin c
#def clear_fb(*args):
# f.fbo.bind()
# f.fbo.clear_buffer()
# f.fbo.release()
#Window.bind(on_draw=clear_fb)
return f
if __name__ == "__main__":
ScreenLayerApp().run()
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