def draw_mask(self, mask_image, pos = (0, 0)):
"""
Draw 'mask_image' over top of the existing image. The luma channel of
the mask image is blended with the alpha channel of the existing
image.
"""
if type(mask_image) in types.StringTypes:
mask_image = imagelib.open(mask_image)
elif isinstance(mask_image, CanvasImage):
mask_image = mask_image.image
self.image.draw_mask(mask_image, pos)
self._image_changed()
def set_image(self, image):
"""
Sets the image for this object to 'image'
"""
if type(image) in types.StringTypes:
self.filename = image
image = imagelib.open(image)
elif isinstance(image, CanvasImage):
image = image.image.copy()
self.filename = None
if self.image == image:
return
if image == None:
self.reset()
self.image = image
self._image_changed()
def draw_image(self, image, dst_pos = (0, 0), dst_size = (-1, -1),
src_pos = (0, 0), src_size = (-1, -1), alpha = 255):
"""
Draws (and blends) another image 'image' on top of the existing image,
at position 'pos', a tuple containing the left and top coordinates
relative to the destination image with layer alpha 'alpha'
"""
if type(image) in types.StringTypes:
image = imagelib.open(image)
elif isinstance(image, CanvasImage):
image = image.image
if not self.image:
if dst_size != (-1, -1):
image.scale(dst_size)
else:
self.image = image
else:
self.image.blend(image, dst_pos, dst_size, src_pos, src_size,
alpha)
self._image_changed()
