Create a new print backend for the updated CUPS APIs

printing/backend/cups_ipp_util.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PRINTING_BACKEND_CUPS_IPP_UTIL_H_
+#define PRINTING_BACKEND_CUPS_IPP_UTIL_H_
+
+#include "base/strings/string_piece.h"
+#include "printing/backend/cups_printer.h"
+#include "printing/backend/print_backend.h"
+
+namespace printing {
+
+// Populates the color_model, bw_model, color_changeable, and color_default in
+// |printer_info| from |printer|.
+void ExtractColor(const CupsPrinter& printer,

[Lei Zhang, 2016/07/13 01:08:42]

Why not just return the color, and let the caller populate |printer_info| ?

[skau, 2016/07/14 20:43:05]

Laziness.  I've fixed it so it's more useful.

+                  PrinterSemanticCapsAndDefaults* printer_info);
+
+// Returns the default paper setting for |printer|.
+PrinterSemanticCapsAndDefaults::Paper DefaultPaper(const CupsPrinter& printer);
+
+// Populates papers and default_paper in |printer_info| from |printer|.
+void ExtractPaper(const CupsPrinter& printer,
+                  PrinterSemanticCapsAndDefaults* printer_info);
+
+// Populates copies_capable in |printer_info| from |printer|.
+void ExtractCopies(const CupsPrinter& printer,
+                   PrinterSemanticCapsAndDefaults* printer_info);
+
+// Populates collate_capable and collate_default in |printer_info| using
+// |printer|.
+void ExtractCollate(const CupsPrinter& printer,
+                    PrinterSemanticCapsAndDefaults* printer_info);
+
+// Populates duplex_capable and duplex_default in |printer_info| from |printer|.
+void ExtractDuplex(const CupsPrinter& printer,
+                   PrinterSemanticCapsAndDefaults* printer_info);
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_CUPS_IPP_UTIL_H_