ptouch-label/ptouch-print のオプション整理と trim-right 対応を反映

CLIヘルプ文言を簡潔化しつつ、右余白トリム機能と関連API・ドキュメント更新をまとめて取り込み、PNG/SVG/テンプレート経路での利用体験を揃える。

Made-with: Cursor

ruby/lib/libptouch/context.rb

@@ -115,6 +115,29 @@ module Libptouch
       [bytes, out_params[:width_dots], out_params[:height_dots]]
     end
 
+    def trim_right_blank_columns(data, width_dots:, height_dots:, margin_mm: 0, right_padding_dots: 0)
+      in_params = Binding::RasterParams.new
+      in_params[:width_dots] = width_dots
+      in_params[:height_dots] = height_dots
+      in_params[:margin_mm] = margin_mm
+      in_buf = FFI::MemoryPointer.new(:uint8, data.bytesize)
+      in_buf.put_bytes(0, data)
+      out_pp = FFI::MemoryPointer.new(:pointer)
+      out_len = FFI::MemoryPointer.new(:size_t)
+      out_params = Binding::RasterParams.new
+      raise_on_error(Binding.libptouch_trim_right_blank_columns(
+                       @native, in_buf, data.bytesize, in_params.pointer,
+                       right_padding_dots, out_pp, out_len, out_params.pointer
+                     ))
+      raw = out_pp.read_pointer
+      raise Libptouch::Error.new(OK, "null raster from trim_right_blank_columns") if raw.null?
+
+      len = out_len.get(:size_t, 0)
+      bytes = raw.read_bytes(len)
+      Binding.libptouch_free_raster(raw)
+      [bytes, out_params[:width_dots], out_params[:height_dots]]
+    end
+
     def status_bytes
       buf = FFI::MemoryPointer.new(:uint8, STATUS_LENGTH)
       raise_on_error(Binding.libptouch_get_status(@native, buf))