Add support for images

lib/ezdoc/nodes/image.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+module Ezdoc
+  module Nodes
+    class Image < Base
+      attr_reader :path, :width_emu, :height_emu, :rid, :filename
+
+      EMUS_PER_INCH = 914_400
+      EMUS_PER_CM = 360_000
+      DEFAULT_DPI = 96
+
+      def initialize(path, rid:, width_emu:, height_emu:)
+        super()
+        @path = path
+        @rid = rid
+        @width_emu = width_emu
+        @height_emu = height_emu
+        @filename = "image#{rid.delete_prefix("rId")}.#{extension}"
+      end
+
+      def extension
+        case File.extname(@path).downcase
+        when ".png" then "png"
+        when ".jpg", ".jpeg" then "jpeg"
+        else raise ArgumentError, "Unsupported image format: #{File.extname(@path)}"
+        end
+      end
+
+      def content_type
+        extension == "png" ? "image/png" : "image/jpeg"
+      end
+
+      def doc_pr_id
+        rid.delete_prefix("rId").to_i
+      end
+    end
+  end
+end