def __call__(self, size: tuple, filepath: Path):
"""
Returns a thumbnail pixbuf for <filepath>, transparently handling
both normal image files and archives. Returns None if thumbnail creation
failed, or if the thumbnail creation is run asynchrounosly
:param size: The dimensions for the created thumbnails (width, height).
:param filepath: Path to the image that the thumbnail is generated from.
"""
try:
with LockedFileIO(filepath) as fio:
with Image.open(fio) as im:
im.thumbnail(size, resample=Image.BOX)
pixbuf = ImageTools.pil_to_pixbuf(im)
if ImageTools.pil_has_alpha(im):
pixbuf = ImageTools.add_alpha_background(pixbuf, pixbuf.get_width(), pixbuf.get_height())
except Exception as ex:
logger.error(f'Failed to create thumbnail for image: \'{filepath}\'')
logger.error(f'Exception: {ex}')
pixbuf = None
return pixbuf
def _add_subpixbuf(self, canvas, x: int, y: int, image_size: tuple, source_pixbuf):
"""
Copy a subpixbuf from <source_pixbuf> to <canvas> as it should
be in the lens if the coordinates <x>, <y> are the mouse pointer
position on the main window layout area.
The displayed image (scaled from the <source_pixbuf>) must have
size <image_size>
"""
# Prevent division by zero exceptions further down
if not image_size[0]:
return
# FIXME This merely prevents Errors being raised if source_pixbuf is an
# animation. The result might be broken, though, since animation,
# rotation etc. might not match or will be ignored:
source_pixbuf = ImageTools.static_image(source_pixbuf)
rotation = config['ROTATION']
if config['AUTO_ROTATE_FROM_EXIF']:
rotation += ImageTools.get_implied_rotation(source_pixbuf)
rotation %= 360
if rotation in (90, 270):
scale = source_pixbuf.get_height() / image_size[0]
else:
scale = source_pixbuf.get_width() / image_size[0]
x *= scale
y *= scale
source_mag = config['LENS_MAGNIFICATION'] / scale
width = height = config['LENS_SIZE'] / source_mag
paste_left = x > width / 2
paste_top = y > height / 2
dest_x = max(0, int(math.ceil((width / 2 - x) * source_mag)))
dest_y = max(0, int(math.ceil((height / 2 - y) * source_mag)))
match rotation:
case 90:
x, y = y, source_pixbuf.get_height() - x
case 180:
x = source_pixbuf.get_width() - x
y = source_pixbuf.get_height() - y
case 270:
x, y = source_pixbuf.get_width() - y, x
src_x = x - width / 2
src_y = y - height / 2
if src_x < 0:
width += src_x
src_x = 0
if src_y < 0:
height += src_y
src_y = 0
width = max(0, min(source_pixbuf.get_width() - src_x, width))
height = max(0, min(source_pixbuf.get_height() - src_y, height))
if width < 1 or height < 1:
return
subpixbuf = source_pixbuf.new_subpixbuf(int(src_x), int(src_y), int(width), int(height))
subpixbuf = subpixbuf.scale_simple(
int(math.ceil(source_mag * subpixbuf.get_width())),
int(math.ceil(source_mag * subpixbuf.get_height())),
config['GDK_SCALING_FILTER'])
subpixbuf = ImageTools.rotate_pixbuf(subpixbuf, rotation)
subpixbuf = ImageTools.enhance(subpixbuf)
if paste_left:
dest_x = 0
else:
dest_x = min(canvas.get_width() - subpixbuf.get_width(), dest_x)
if paste_top:
dest_y = 0
else:
dest_y = min(canvas.get_height() - subpixbuf.get_height(), dest_y)
if subpixbuf.get_has_alpha():
subpixbuf = ImageTools.add_alpha_background(subpixbuf, subpixbuf.get_width(), subpixbuf.get_height())
subpixbuf.copy_area(0, 0, subpixbuf.get_width(), subpixbuf.get_height(), canvas, dest_x, dest_y)
