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93 lines
3.2 KiB
93 lines
3.2 KiB
import os
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import hashlib
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from calculate.utils.files import Process, write_file, read_file
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class ImageMagickError(Exception):
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pass
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class ImageMagick:
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def __init__(self, prefix='/'):
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self.prefix = prefix
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self.init_commands(prefix)
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self.default_opts = []
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@property
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def available(self):
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return self.convert_cmd and self.identify_cmd
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@property
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def chroot(self):
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return self.prefix != '/'
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def init_commands(self, prefix):
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self.convert_cmd = "/usr/bin/convert"
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self.identify_cmd = "/usr/bin/identify"
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self.chroot_cmd = "/bin/chroot"
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self.bash_cmd = "/bin/bash"
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if not os.path.exists(os.path.join(prefix, self.convert_cmd[1:])):
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self.convert_cmd = None
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if not os.path.exists(os.path.join(prefix, self.identify_cmd[1:])):
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self.identify_cmd = None
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def trim_prefix_path(self, filename):
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retpath = "/%s" % os.path.relpath(filename, self.prefix)
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if retpath.startswith("/.."):
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return None
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return retpath
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def get_image_resolution(self, source):
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if self.chroot:
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identify = Process(self.chroot_cmd, self.prefix,
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self.bash_cmd, "-c",
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" ".join([self.identify_cmd,
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"-format '%w %h'", source]))
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else:
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identify = Process(self.identify_cmd, "-format", "%w %h", source)
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if identify.success():
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swidth, _sep, sheight = identify.read().strip().partition(" ")
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if swidth.isdigit() and sheight.isdigit():
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return int(swidth), int(sheight)
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return None
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def convert(self, source, target, *opts):
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command = [self.convert_cmd, "-quality", "95",
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source]
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command.extend(self.default_opts)
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command.extend(opts)
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command.append(target)
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if self.chroot:
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convert = Process(self.chroot_cmd, self.prefix,
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self.bash_cmd, "-c",
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" ".join(command))
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else:
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convert = Process(*command)
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if convert.success():
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return True
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else:
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print(convert.read_error())
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return False
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def convert_resize_crop_center(self, source, target, height, width):
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#if ((width == self.source_width and height == self.source_height) and
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# (source.rpartition('.')[2] == target.rpartition('.')[2])):
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# with write_file(target) as sf:
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# sf.write(read_file(source))
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# return True
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res = "%dx%d" % (width, height)
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return self.convert(source, target, "-quality", "95",
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"-resize", "%s^" % res,
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"-strip", "-gravity", "center",
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"-crop", "%s+0+0" % res)
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def convert_resize_gfxboot(self, source, target, height, width):
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res = "%dx%d" % (width, height)
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return self.convert(source, target, "-quality", "95",
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"-resize", "%s^" % res,
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"-strip", "-gravity", "center",
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"-crop", "%s+0+0" % res,
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"-sampling-factor", "2x2",
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"-interlace", "none",
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"-set", "units", "PixelsPerSecond")
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