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Size: 1.56 KB
Versions: 5
Compression:
Stored size: 1.56 KB
Contents
class PSD::Image
module Format
# 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.times do |i|
height.times do |j|
byte_counts << @file.read_short
end
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}: position = #{chan_pos}, line = #{line_index}"
chan_pos = decode_rle_channel(chan_pos, line_index)
line_index += height
end
end
def decode_rle_channel(chan_pos, line_index)
height.times do |j|
byte_count = @byte_counts[line_index]
line_index += 1
finish = @file.tell + byte_count
while @file.tell < finish
len = @file.read(1).bytes.to_a[0]
if len < 128
len += 1
(chan_pos...chan_pos+len).each do |k|
@channel_data[k] = @file.read(1).bytes.to_a[0]
end
chan_pos += len
elsif len > 128
len ^= 0xff
len += 2
val = @file.read(1).bytes.to_a[0]
(chan_pos...chan_pos+len).each do |k|
@channel_data[k] = val
end
chan_pos += len
end
end
end
return chan_pos
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems