61 lines
1.3 KiB
Ruby
61 lines
1.3 KiB
Ruby
#coding=utf-8
|
|
|
|
module Trustie
|
|
module Utils
|
|
class Image
|
|
def initialize(file, bak=false)
|
|
@file = file
|
|
@bak = bak
|
|
end
|
|
|
|
def bitmap?(data)
|
|
data[0,2]==77.chr + 66.chr
|
|
end
|
|
|
|
def gif?(data)
|
|
data[0,4]==71.chr + 73.chr + 70.chr + 56.chr
|
|
end
|
|
|
|
def jpeg?(data)
|
|
data[0,3]== 0xff.chr + 0xd8.chr + 0xff.chr
|
|
end
|
|
def png?(data)
|
|
data[0,2]==0x89.chr + 80.chr
|
|
end
|
|
|
|
def image?
|
|
data = ''
|
|
if @file.respond_to?(:read)
|
|
data = @file.read(9)
|
|
@file.rewind
|
|
end
|
|
return false if data.size < 9
|
|
bitmap?(data) || gif?(data) || jpeg?(data) || png?(data)
|
|
end
|
|
|
|
def compress(size=300)
|
|
backup if @bak
|
|
begin
|
|
f = Magick::ImageList.new(@file)
|
|
if f.format != 'GIF'
|
|
width = size
|
|
if f[0].columns > width
|
|
proportion = (width/f[0].columns.to_f)
|
|
height = (f[0].rows*proportion)
|
|
f.resize_to_fill!(width,height.to_i)
|
|
f.write(@file)
|
|
end
|
|
end
|
|
rescue Exception => e
|
|
Rails.logger.error "[Error] compress : ===> #{e}"
|
|
end
|
|
end
|
|
|
|
def backup
|
|
FileUtils.cp @file, "#{@file}.bak"
|
|
end
|
|
|
|
end
|
|
end
|
|
end
|