Added Header and Footer support using Skia

printing/units.cc

 // Copyright (c) 2006-2008 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.
 
 #include "printing/units.h"
 
 #include "base/logging.h"
+#include "chrome/common/print_messages.h"
+#include "printing/print_job_constants.h"
 
 namespace printing {
 
 int ConvertUnit(int value, int old_unit, int new_unit) {
   DCHECK_GT(new_unit, 0);
   DCHECK_GT(old_unit, 0);
   // With integer arithmetic, to divide a value with correct rounding, you need
   // to add half of the divisor value to the dividend value. You need to do the
   // reverse with negative number.
   if (value >= 0) {
@@ skipping 22 matching lines @@
 }
 
 int ConvertPixelsToPoint(int pixels) {
   return ConvertUnit(pixels, kPixelsPerInch, kPointsPerInch);
 }
 
 double ConvertPixelsToPointDouble(double pixels) {
   return ConvertUnitDouble(pixels, kPixelsPerInch, kPointsPerInch);
 }
 
+double ConvertPointsToPixelDouble(double points) {
+  return ConvertUnitDouble(points, kPointsPerInch, kPixelsPerInch);
+}
+
+double GetSegmentWidth(double page_width) {
+  // Interstice is left at both ends of the page as well as between
+  // each region, so 1 is added.
+  double total_interstice_width =
+      (printing::kSettingHeaderFooterHorizontalRegions + 1) *
+      printing::kSettingHeaderFooterInterstice;
+  return (page_width - total_interstice_width) /
+             printing::kSettingHeaderFooterHorizontalRegions;
+}
+
+int GetDPI(const PrintMsg_Print_Params* print_params) {
+#if defined(OS_MACOSX)
+  // On the Mac, the printable area is in points, don't do any scaling based
+  // on dpi.
+  return printing::kPointsPerInch;
+#else
+  return static_cast<int>(print_params->dpi);
+#endif  // defined(OS_MACOSX)
+}
+
 }  // namespace printing