Sha256: 1c953032db9b6fdf7d33f62988a8db17806350833c685fb758f2b4cf0b86d11a
Contents?: true
Size: 1.75 KB
Versions: 5
Compression:
Stored size: 1.75 KB
Contents
require 'psd/layer_info'
class PSD
class Curves < LayerInfo
def self.should_parse?(key)
key == 'curv'
end
attr_reader :curves
def parse
# Padding, spec is wrong. Maybe Photoshop bug?
@file.seek 1, IO::SEEK_CUR
# Version
@file.seek 2, IO::SEEK_CUR
tag = @file.read_int
curve_count = 0
# Legacy data, it looks like there are 32 positions
# where you can adjust the curve, and there is a chunk
# of 32 bytes that determine whether that chunk is set.
32.times do |i|
curve_count += 1 if tag & (1 << i) > 0
end
@curves = []
curve_count.times do |i|
# Before each curve is a channel index
count = 0
curve = {}
32.times do |j|
if tag & (1 << j) > 0
if count == i
curve[:channel_index] = j
break
end
count += 1
end
end
point_count = @file.read_short
curve[:points] = point_count.times.map do
{
output_value: @file.read_short,
input_value: @file.read_short
}
end
@curves << curve
end
if @file.tell < @section_end - 4
tag = @file.read_string(4)
raise "Extra curves key error: #{tag}" if tag != 'Crv '
@file.seek 2, IO::SEEK_CUR
curve_count = @file.read_int
curve_count.times do
curve = { channel_index: @file.read_short }
point_count = @file.read_short
curve[:points] = point_count.times.map do
{
output_value: @file.read_short,
input_value: @file.read_short
}
end
@curves << curve
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems