def test_img_to_buf_source(self):
img = new("RGB", (256, 256), "red")
img.save("test2.jpg")
img.format = "JPEG"
data = img_to_buf(img, 'source').read()
# a 'JFIF' chunk in the bitstream indicates a .jpg image
assert 'JFIF' in data
def test_img_to_buf_png(self):
img = new("RGB", (256, 256), "red")
img.save("test1.png", 'PNG')
data = img_to_buf(img, 'png').read()
# ImageHeaDeR, ImageDATa, and ImageEND are
# all necessary chunks in a .PNG bitstream
assert 'IHDR' in data and 'IDAT' in data and 'IEND' in data
def test_insert_image_blob(self):
img = new("RGB", (256, 256), "red")
data = img_to_buf(img, 'jpeg').read()
tempDB = self.__make_tempDB()
tempDB.insert_image_blob(0, 0, 0, Binary(data))
result = tempDB.cursor.execute("select count(*) from tiles;")
assert result.fetchone()[0] == 1
def test_combine_worker_dbs():
session_folder = make_session_folder()
# make a random number of tempdbs with dummy data
img = new("RGB", (256, 256), "red")
data = img_to_buf(img, 'jpeg').read()
z = randint(2, 5)
for x in xrange(z):
TempDB(session_folder).insert_image_blob(x, 0, 0, Binary(data))
# confirm that combine_worker_dbs assimilates all tempdb's into gpkg
chdir(session_folder) # necessary to put gpkg in session_folder
gpkg = Geopackage("test.gpkg", 4326)
combine_worker_dbs(gpkg)
result = gpkg.execute("select count(*) from tiles;")
assert (result.fetchone())[0] == z
def test_img_to_buf_jpg(self):
img = new("RGB", (256, 256), "red")
data = img_to_buf(img, 'jpeg').read()
# a 'JFIF' chunk in the bitstream indicates a .jpg image
assert 'JFIF' in data