def check_original_dimensions(img):
assert img.size == Size(100, 100)
assert img[0].size == Size(32, 32)
assert img[0].canvas.position == Vector(5, 10)
assert img[1].size == Size(32, 32)
assert img[1].canvas.position == Vector(35, 30)
assert img[2].size == Size(32, 32)
assert img[2].canvas.position == Vector(62, 50)
assert img[3].size == Size(32, 32)
assert img[3].canvas.position == Vector(10, 55)
def test_pixel_iter():
"""Does iterating over pixels appear to work?"""
img = Image.read(util.find_image('terminal.gif'))
pixel_iter = iter(img[0].pixels)
white = RGBColor(1., 1., 1.)
px = next(pixel_iter)
assert px.point == Vector(0, 0)
assert px.color == white
px = next(pixel_iter)
assert px.point == Vector(1, 0)
assert px.color == white
def test_multi_frame_resize():
"""ImageMagick doesn't handle resizing correctly when a virtual canvas is
involved. Make sure we fixed it.
"""
img = get_image('anim_bgnd.gif')
# Original dimensions
assert img.size == Size(100, 100)
assert img[0].size == Size(32, 32)
assert img[0].canvas.position == Vector(5, 10)
assert img[1].size == Size(32, 32)
assert img[1].canvas.position == Vector(35, 30)
assert img[2].size == Size(32, 32)
assert img[2].canvas.position == Vector(62, 50)
assert img[3].size == Size(32, 32)
assert img[3].canvas.position == Vector(10, 55)
img = img.resized(img.size * 0.5)
# Resized dimensions -- reduced by half
assert img.size == Size(50, 50)
assert img[0].size == Size(16, 16)
assert img[0].canvas.position == Vector(3, 5)
assert img[1].size == Size(16, 16)
assert img[1].canvas.position == Vector(18, 15)
assert img[2].size == Size(16, 16)
assert img[2].canvas.position == Vector(31, 25)
assert img[3].size == Size(16, 16)
assert img[3].canvas.position == Vector(5, 28)
def __setitem__(self, point, color):
"""Set a single pixel to a given color.
This is "slow", in the sense that you probably don't want to do this to
edit every pixel in an entire image.
"""
point = Vector.coerce(point)
rgb = color.rgb()
# TODO retval is t/f
with magick_try() as exc:
# Surprise! GetOneCacheViewAuthenticPixel doesn't actually respect
# writes, even though the docs explicitly says it does.
# So get a view of this single pixel instead.
px = lib.GetCacheViewAuthenticPixels(self._ptr, point.x, point.y,
1, 1, exc.ptr)
exc.check(px == ffi.NULL)
array = ffi.new("double[]",
[rgb._red, rgb._green, rgb._blue, rgb._opacity])
lib.sanpera_pixel_from_doubles(px, array)
#print(repr(ffi.buffer(ffi.cast("char*", ffi.cast("void*", px)), 16)[:]))
with magick_try() as exc:
assert lib.SyncCacheViewAuthenticPixels(self._ptr, exc.ptr)
def __getitem__(self, point):
point = Vector.coerce(point)
px = ffi.new("PixelPacket *")
# TODO retval is t/f
with magick_try() as exc:
lib.GetOneCacheViewAuthenticPixel(self._ptr, point.x, point.y, px, exc.ptr)
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(px, array)
return RGBColor(*array)
def __getitem__(self, point):
point = Vector.coerce(point)
px = ffi.new("PixelPacket *")
# TODO retval is t/f
with magick_try() as exc:
lib.GetOneCacheViewAuthenticPixel(self._ptr, point.x, point.y, px,
exc.ptr)
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(px, array)
return RGBColor(*array)
def __setitem__(self, point, color):
"""Set a single pixel to a given color.
This is "slow", in the sense that you probably don't want to do this to
edit every pixel in an entire image.
"""
point = Vector.coerce(point)
rgb = color.rgb()
# TODO retval is t/f
with magick_try() as exc:
# Surprise! GetOneCacheViewAuthenticPixel doesn't actually respect
# writes, even though the docs explicitly says it does.
# So get a view of this single pixel instead.
px = lib.GetCacheViewAuthenticPixels(
self._ptr, point.x, point.y, 1, 1, exc.ptr)
exc.check(px == ffi.NULL)
array = ffi.new("double[]", [rgb._red, rgb._green, rgb._blue, rgb._opacity])
lib.sanpera_pixel_from_doubles(px, array)
#print(repr(ffi.buffer(ffi.cast("char*", ffi.cast("void*", px)), 16)[:]))
with magick_try() as exc:
assert lib.SyncCacheViewAuthenticPixels(self._ptr, exc.ptr)
def point(self):
return Vector(self._x, self._y)
