Sha256: cc79f4ed5f9d0fe7ed1933d91ecf88b8f58760b88c97448471c69fe4f620baeb
Contents?: true
Size: 1.35 KB
Versions: 18
Compression:
Stored size: 1.35 KB
Contents
class PSD
module ImageFormat
# Parses an RLE compressed image
module RLE
private
def parse_rle!
@byte_counts = parse_byte_counts!
parse_channel_data!
end
def parse_byte_counts!
byte_counts = []
(channels * height).times do |i|
byte_counts << @file.read_short
end
return byte_counts
end
def parse_channel_data!
@chan_pos = 0
@line_index = 0
channels.times do |i|
PSD.logger.debug "Parsing RLE channel ##{i}: file position = #{@file.tell}, image position = #{@chan_pos}, line = #{@line_index}"
decode_rle_channel
@line_index += height
end
end
def decode_rle_channel
height.times do |j|
byte_count = @byte_counts[@line_index + j]
finish = @file.tell + byte_count
while @file.tell < finish
len = @file.read_byte
if len < 128
len += 1
@channel_data.insert @chan_pos, *@file.read(len).bytes.to_a
@chan_pos += len
elsif len > 128
len ^= 0xff
len += 2
val = @file.read(1).bytes.to_a
@channel_data.insert @chan_pos, *(val * len)
@chan_pos += len
end
end
end
end
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems