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'''test for reference counting problems.
If a Python object is garbage collected while another object is using its
data, you will get a segmentation fault.
'''
import array
import gc
import tempfile as tfi
import cairo
import py.test as test
width, height = 256, 256
def draw(ctx, width, height):
"example draw code"
ctx.scale(width/1.0, height/1.0)
pat = cairo.LinearGradient(0.0, 0.0, 0.0, 1.0)
pat.add_color_stop_rgba(1, 0, 0, 0, 1)
pat.add_color_stop_rgba(0, 1, 1, 1, 1)
ctx.rectangle(0,0,1,1)
ctx.set_source(pat)
ctx.fill()
def test_create_for_stream():
def run_test(surface_method, suffix):
_, fo = tfi.mkstemp(prefix='pycairo_', suffix=suffix)
surface = surface_method(fo, width, height)
ctx = cairo.Context(surface)
del fo # test that 'fo' is referenced to keep it alive
gc.collect()
draw(ctx, width, height)
ctx.show_page()
surface.finish()
if cairo.HAS_PDF_SURFACE:
run_test(cairo.PDFSurface, '.pdf')
if cairo.HAS_PS_SURFACE:
run_test(cairo.PSSurface, '.ps')
if cairo.HAS_SVG_SURFACE:
run_test(cairo.SVGSurface, '.svg')
def test_get_data():
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
memView = surface.get_data()
del surface # test that 'surface' is referenced to keep it alive
gc.collect()
memView[0] = b'\xFF'
data = memView.tobytes()
def test_create_for_data():
data = array.array('B', [0] * width * height * 4)
surface = cairo.ImageSurface.create_for_data(data, cairo.FORMAT_ARGB32,
width, height)
ctx = cairo.Context(surface)
del data # test that 'data' is referenced to keep it alive
gc.collect()
draw(ctx, width, height)
_, fo = tfi.mkstemp(prefix='pycairo_', suffix='.png')
surface.write_to_png(fo)
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