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from vispy.app.backends._offscreen_util import OffscreenContext, FrameBufferHelper
from vispy.testing import run_tests_if_main, requires_application
from vispy import gloo
import numpy as np
@requires_application()
def test_offscreen_context():
c1 = OffscreenContext()
c2 = OffscreenContext.get_global_instance()
c3 = OffscreenContext.get_global_instance()
c4 = OffscreenContext()
assert c1 is not c2
assert c1 is not c4
assert c2 is c3
c1.make_current()
c1.close()
class FakeCanvas(object):
def __init__(self):
self.context = gloo.GLContext()
gloo.context.set_current_canvas(self)
def flush(self):
self.context.flush_commands()
@requires_application()
def test_frame_buffer_helper():
canvas = FakeCanvas()
gl_context = OffscreenContext()
fbh = FrameBufferHelper()
gl_context.make_current()
fbh.set_physical_size(43, 67)
with fbh:
gloo.set_clear_color((0, 0.5, 1))
gloo.clear()
canvas.flush()
array = fbh.get_frame()
assert array.shape == (67, 43, 4)
assert np.all(array[:, :, 0] == 0)
assert np.all(array[:, :, 1] == 128)
assert np.all(array[:, :, 2] == 255)
run_tests_if_main()
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