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configs/apps/gladevcp/animated-backdrop/cairodraw.py

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+import cairo
+from math import pi
+
+
+pngfile = 'vortex.me.png'
+
+class HandlerClass:
+
+    def on_draw(self, widget, cr):
+        print("on_draw")
+
+        # Sets the operator to clear which deletes everything below
+        # where an object is drawn
+        cr.set_operator(cairo.OPERATOR_CLEAR)
+        width = widget.get_allocated_width()
+        height = widget.get_allocated_height()
+        # Makes the mask fill the entire window
+        cr.rectangle(0.0, 0.0, width, height)
+        # Deletes everything in the window (since the compositing
+        # operator is clear and mask fills the entire window
+        cr.fill()
+        # Set the compositing operator back to the default
+        cr.set_operator(cairo.OPERATOR_OVER)
+
+        if self.scale:
+            w, h = widget.get_allocated_width(), widget.get_allocated_height()
+            cr.scale(1.0 *w / self.width, 1.0*h/self.height)
+
+        cr.set_source_surface(self.img, 0, 0)
+        cr.paint()
+
+
+
+    def __init__(self, halcomp,builder,useropts):
+
+        self.builder = builder
+        win = self.builder.get_object("window1")
+
+        #win.set_decorated(False)
+
+        self.img = cairo.ImageSurface.create_from_png(pngfile)
+        self.width = self.img.get_width()
+        self.height = self.img.get_height()
+
+        # Makes the window paintable, so we can draw directly on it
+        win.set_app_paintable(True)
+        win.set_size_request(self.width, self.height)
+
+        # This sets the windows colormap, so it supports transparency.
+        # This will only work if the wm support alpha channel
+        screen = win.get_screen()
+        rgba = screen.get_rgba_visual()
+        win.set_visual(rgba)
+
+        # scaling the bitmap is possible by turning this on
+        # however the fixed widget does NOT do proportional scaling
+        self.scale = 1
+
+def get_handlers(halcomp,builder,useropts):
+
+    return [HandlerClass(halcomp,builder,useropts)]