Class: ChunkyPNG::Chunk::ImageData
Instance Attribute Summary
Attributes inherited from Generic
#content
Attributes inherited from Base
#type
Class Method Summary
collapse
Methods inherited from Generic
#initialize
Methods inherited from Base
#initialize, #write, #write_with_crc
Class Method Details
.combine_chunks(data_chunks) ⇒ Object
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# File 'lib/chunky_png/chunk.rb', line 195
def self.combine_chunks(data_chunks)
Zlib::Inflate.inflate(data_chunks.map { |c| c.content }.join(''))
end
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.read(type, content) ⇒ Object
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# File 'lib/chunky_png/chunk.rb', line 190
def self.read(type, content)
raise ExpectationFailed, 'The IDAT chunk should not be empty!' if content.bytesize == 0
super
end
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.split_in_chunks(data, level = Zlib::DEFAULT_COMPRESSION, chunk_size = 2147483647) ⇒ Object
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# File 'lib/chunky_png/chunk.rb', line 199
def self.split_in_chunks(data, level = Zlib::DEFAULT_COMPRESSION, chunk_size = 2147483647)
streamdata = Zlib::Deflate.deflate(data, level)
[ ChunkyPNG::Chunk::ImageData.new('IDAT', streamdata) ]
end
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