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 color(self, value):
if self._pixel == ffi.NULL:
raise ValueError("Pixel has expired")
array = ffi.new(
"double[]",
[value._red, value._green, value._blue, value._opacity])
lib.sanpera_pixel_from_doubles(self._pixel, 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 color(self, value):
if self._pixel == ffi.NULL:
raise ValueError("Pixel has expired")
array = ffi.new("double[]", [value._red, value._green, value._blue, value._opacity])
lib.sanpera_pixel_from_doubles(self._pixel, array)
def _populate_pixel(self, pixel):
"""Copy values to a PixelPacket."""
rgb = self.rgb()
lib.sanpera_pixel_from_doubles(pixel, rgb._array)
def _populate_pixel(self, pixel):
"""Copy values to a PixelPacket."""
rgb = self.rgb()
lib.sanpera_pixel_from_doubles(pixel, rgb._array)
