test window for diagnozing colours and transparency issues (rgba vs b…

…gra etc)

git-svn-id: https://xpra.org/svn/Xpra/trunk@3367 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/tests/xpra/transparent_colors.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+
+import cairo
+from gi.repository import Gtk   #@UnresolvedImport
+
+class TransparentColorWindow(Gtk.Window):
+    def __init__(self):
+        super(TransparentColorWindow, self).__init__()
+        self.set_position(Gtk.WindowPosition.CENTER)
+        self.set_default_size(320, 320)
+        screen = self.get_screen()
+        self.visual = screen.get_rgba_visual()
+        if self.visual and screen.is_composited():
+            self.set_visual(self.visual)
+        else:
+            print("transparency not available!")
+
+        self.set_app_paintable(True)
+        self.connect("draw", self.area_draw)
+        self.connect("destroy", Gtk.main_quit)
+        self.show_all()
+
+    def area_draw(self, widget, cr):
+        cr.set_font_size(32)
+        #Clear everything:
+        cr.set_operator(cairo.OPERATOR_CLEAR)
+        w, h = widget.get_size()
+        cr.rectangle(0, 0, w, h)
+        cr.fill()
+
+        #Red block
+        cr.set_operator(cairo.OPERATOR_SOURCE)
+        cr.set_source_rgba(1, 0, 0, 1)
+        cr.rectangle(0, 0, w/2, h/2)
+        cr.fill()
+        cr.set_source_rgba(1, 1, 1, 1)
+        cr.move_to(w/4-12, h/4+8)
+        cr.show_text("R")
+        #Green block:
+        cr.set_operator(cairo.OPERATOR_SOURCE)
+        cr.set_source_rgba(0, 1, 0, 1)
+        cr.rectangle(w/2, 0, w/2, h/2)
+        cr.fill()
+        cr.set_source_rgba(1, 1, 1, 1)
+        cr.move_to(w*3/4-12, h/4+8)
+        cr.show_text("G")
+        #Blue block:
+        cr.set_operator(cairo.OPERATOR_SOURCE)
+        cr.set_source_rgba(0, 0, 1, 1)
+        cr.rectangle(0, h/2, w/2, h/2)
+        cr.fill()
+        cr.set_source_rgba(1, 1, 1, 1)
+        cr.move_to(w/4-12, h*3/4+8)
+        cr.show_text("B")
+
+        #Transparent Block:
+        cr.set_operator(cairo.OPERATOR_SOURCE)
+        bx = w/2
+        by = h/2
+        bw = float(w)/2/16
+        bh = float(h)/2/16
+        #print("bx=%s, by=%s, bw=%s, bh=%s" % (bx, by, bw, bh))
+        for i in range(256):
+            alpha = float(i+1)/256.0
+            cr.set_source_rgba(1, 1, 1, alpha)
+            rx, ry, rw, rh = bx+(i%16)*bw, by+(i//16)*bh, bw, bh
+            cr.rectangle(rx, ry, rw, rh)
+            #print("rectangle(%s, %s, %s, %s) alpha=%s" % (rx, ry, rw, rh, alpha))
+            cr.fill()
+
+TransparentColorWindow()
+Gtk.main()