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Negate opacity channel on ImageMagick 7

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In ImageMagick 7, the semantics of the opacity channel is flipped.
This commit is contained in:
Quantum 2022-04-24 02:13:45 -04:00
parent ffb9c5e24a
commit 7863775921
1 changed files with 10 additions and 2 deletions
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12
win2xcur/shadow.py
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@ -7,8 +7,10 @@ from win2xcur.cursor import CursorFrame
if 'copy_opacity' in COMPOSITE_OPERATORS:
COPY_ALPHA = 'copy_opacity' # ImageMagick 6 name
NEEDS_NEGATE = False
else:
COPY_ALPHA = 'copy_alpha' # ImageMagick 7 name
NEEDS_NEGATE = True
def apply_to_image(image: BaseImage, *, color: str, radius: float, sigma: float, xoffset: float,
@ -18,8 +20,14 @@ def apply_to_image(image: BaseImage, *, color: str, radius: float, sigma: float,
new_width = image.width + 3 * xoffset
new_height = image.height + 3 * yoffset
if NEEDS_NEGATE:
channel = image.channel_images['opacity'].clone()
channel.negate()
else:
channel = image.channel_images['opacity']
opacity = Image(width=new_width, height=new_height, pseudo='xc:white')
opacity.composite(image.channel_images['opacity'], left=xoffset, top=yoffset)
opacity.composite(channel, left=xoffset, top=yoffset)
opacity.gaussian_blur(radius * image.width, sigma * image.width)
opacity.negate()
opacity.modulate(50)
@ -28,8 +36,8 @@ def apply_to_image(image: BaseImage, *, color: str, radius: float, sigma: float,
shadow.composite(opacity, operator=COPY_ALPHA)
result = Image(width=new_width, height=new_height, pseudo='xc:transparent')
result.composite(shadow)
result.composite(image)
result.composite(shadow, operator='difference')
trimmed = result.clone()
trimmed.trim(color=Color('transparent'))