PNG::Parser

PASSES = [{start_x: 0_u32, start_y: 0_u32, each_x: 8_u32, each_y: 8_u32}, {start_x: 4_u32, start_y: 0_u32, each_x: 8_u32, each_y: 8_u32}, {start_x: 0_u32, start_y: 4_u32, each_x: 4_u32, each_y: 8_u32}, {start_x: 2_u32, start_y: 0_u32, each_x: 4_u32, each_y: 4_u32}, {start_x: 0_u32, start_y: 2_u32, each_x: 2_u32, each_y: 4_u32}, {start_x: 1_u32, start_y: 0_u32, each_x: 2_u32, each_y: 2_u32}, {start_x: 0_u32, start_y: 1_u32, each_x: 1_u32, each_y: 2_u32}]

new(header : PNG::Header)

pass=(pass : Int32)

scanline=(scanline : Int32)

x(n)