Merge pull request #93 from redcap97/resolution_info

added support for ResolutionInfo

lib/psd/resources/base.rb

@@ -28,3 +28,4 @@ def name; self.class.name; end
 require 'psd/resources/layer_comps'
 require 'psd/resources/slices'
 require 'psd/resources/xmp_metadata'
+require 'psd/resources/resolution_info'

lib/psd/resources/resolution_info.rb

@@ -0,0 +1,48 @@
+require 'psd/resources/base'
+
+class PSD
+ class Resource
+ module Section
+ class ResolutionInfo < Base
+ RES_UNIT_NAMES = %w(pixel/inch pixel/cm).freeze
+ UNIT_NAMES = %w(in cm pt picas columns).freeze
+
+ resource_id 1005
+ name :resolution_info
+
+ attr_reader :h_res, :h_res_unit, :width_unit
+ attr_reader :v_res, :v_res_unit, :height_unit
+
+ def parse
+ # 32-bit fixed-point number (16.16)
+ @h_res = @file.read_uint.to_f / (1 << 16)
+ @h_res_unit = @file.read_ushort
+ @width_unit = @file.read_ushort
+
+ # 32-bit fixed-point number (16.16)
+ @v_res = @file.read_uint.to_f / (1 << 16)
+ @v_res_unit = @file.read_ushort
+ @height_unit = @file.read_ushort
+
+ @resource.data = self
+ end
+
+ def h_res_unit_name
+ RES_UNIT_NAMES.fetch(h_res_unit - 1, 'unknown')
+ end
+
+ def v_res_unit_name
+ RES_UNIT_NAMES.fetch(v_res_unit - 1, 'unknown')
+ end
+
+ def width_unit_name
+ UNIT_NAMES.fetch(width_unit - 1, 'unknown')
+ end
+
+ def height_unit_name
+ UNIT_NAMES.fetch(height_unit - 1, 'unknown')
+ end
+ end
+ end
+ end
+end