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#
# Unit Tests utils
#
# Copyright (C) 2023-2024 Juan Pablo Ugarte
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation;
# version 2.1 of the License.
#
# library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# Authors:
# Juan Pablo Ugarte <juanpablougarte@gmail.com>
#
import io
import cairo
import struct
import time
from gi.repository import GLib, Gtk
# Based on Gtk sources gtktestutils.c gtk_test_widget_wait_for_draw()
def wait_for_drawing(window):
done = {"done": False}
main_loop = GLib.MainContext.default()
def quit_main_loop_callback(widget, frame_clock, done):
done["done"] = True
main_loop.wakeup()
return GLib.SOURCE_REMOVE
window.add_tick_callback(quit_main_loop_callback, done)
while not done["done"]:
main_loop.iteration(True)
def surface_write_ppm(surface, path):
data = surface.get_data()
w = surface.get_width()
h = surface.get_height()
with open(path, "wb") as fd:
fd.write(bytes(f"P6\n#Created by Cambalache tests/utils.py\n#\n{w} {h}\n255\n", "utf-8"))
for r, g, b, a in struct.iter_unpack("BBBB", data):
fd.write(bytes([r, g, b]))
fd.close()
def window_screenshot(window):
if window is None:
return None
# Wait for window to finish drawing
wait_for_drawing(window)
paintable = Gtk.WidgetPaintable.new(window)
snapshot = Gtk.Snapshot()
w = paintable.get_intrinsic_width()
h = paintable.get_intrinsic_height()
# Draw widget to cairo surface
surface = cairo.ImageSurface(cairo.FORMAT_RGB24, w, h)
paintable.snapshot(snapshot, w, h)
node = snapshot.to_node()
cr = cairo.Context(surface)
node.draw(cr)
surface.flush()
return surface
def image_reload_as_png(surface):
screenshot_png_bytes = io.BytesIO()
surface.write_to_png(screenshot_png_bytes)
screenshot_png_bytes.seek(0)
return cairo.ImageSurface.create_from_png(screenshot_png_bytes)
def mean_squared_error(original, screenshot, ignore_color=None):
original_data = original.get_data()
screenshot_data = screenshot.get_data()
n = original.get_width() * original.get_height()
if len(original_data) != len(screenshot_data):
raise ValueError("Screenshot has different size")
# Calculate mean squared error for each channel
red = 0.0
green = 0.0
blue = 0.0
for i in range(0, n):
offset = i * 4
r, g, b, a = struct.unpack_from("BBBB", original_data, offset)
rr, gg, bb, aa = struct.unpack_from("BBBB", screenshot_data, offset)
if ignore_color is not None:
ir, ig, ib = ignore_color
if r == ir and g == ig and b == ib:
continue
red += (r / 255.0 - rr / 255.0) ** 2
green += (g / 255.0 - gg / 255.0) ** 2
blue += (b / 255.0 - bb / 255.0) ** 2
total = 0.2126 * red + 0.7152 * green + 0.0722 * blue
return red / n, green / n, blue / n, total / n
def process_all_pending_gtk_events(deciseconds=3):
main_loop = GLib.MainContext.default()
for i in range(deciseconds*10):
while main_loop.pending():
main_loop.iteration(False)
time.sleep(0.01)
def __get_children(obj):
if obj is None:
return []
retval = []
child = obj.get_first_child()
while child is not None:
retval.append(child)
child = child.get_next_sibling()
return retval
def find_by_buildable_id(widget, name):
retval = None
if isinstance(widget, Gtk.Buildable) and Gtk.Buildable.get_buildable_id(widget) == name:
return widget
for child in __get_children(widget):
retval = find_by_buildable_id(child, name)
if retval:
return retval
if isinstance(child, Gtk.Buildable) and Gtk.Buildable.get_buildable_id(child) == name:
return child
return retval
def cmb_create_app():
from cambalache.app import CmbApplication
settings = Gtk.Settings.get_default()
settings.props.gtk_enable_animations = False
app = CmbApplication()
app.register()
app.activate()
window = None
# Spin until we get the main window
main_loop = GLib.MainContext.default()
while main_loop.pending() and not window:
main_loop.iteration(False)
# Get window if any
windows = app.get_windows()
if len(windows):
window = windows[0]
return app, window
def cmb_destroy_app(app, window):
window.activate_action("close", None)
process_all_pending_gtk_events()
window.destroy()
app.quit()
process_all_pending_gtk_events()
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