Added Header and Footer support using Skia

chrome/renderer/print_web_view_helper_linux.cc

 // Copyright (c) 2011 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 "chrome/renderer/print_web_view_helper.h"
 
 #include "base/file_descriptor_posix.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
+#include "base/utf_string_conversions.h"

[vandebo (ex-Chrome), 2011/07/19 21:31:20]

Looks like you've added a bunch of extra includes that aren't needed any more. 
Please only include things that are needed.

[Aayush Kumar, 2011/07/21 21:58:53]

Done.

 #include "chrome/common/print_messages.h"
 #include "content/common/view_messages.h"
 #include "printing/metafile.h"
 #include "printing/metafile_impl.h"
 #include "printing/metafile_skia_wrapper.h"
 #include "skia/ext/vector_canvas.h"
+#include "skia/ext/vector_platform_device_skia.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkDraw.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
+#include "third_party/skia/include/core/SkTypeface.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "ui/gfx/point.h"
 
 #if !defined(OS_CHROMEOS)
 #include "base/process_util.h"
 #endif  // !defined(OS_CHROMEOS)
 
 using WebKit::WebFrame;
 using WebKit::WebNode;
 
 void PrintWebViewHelper::RenderPreviewPage(int page_number) {
   PrintMsg_PrintPage_Params page_params;
   page_params.params = print_preview_context_.print_params();
   page_params.page_number = page_number;
 
   base::TimeTicks begin_time = base::TimeTicks::Now();
   PrintPageInternal(page_params,
                     print_preview_context_.GetPrintCanvasSize(),
                     print_preview_context_.frame(),
-                    print_preview_context_.metafile());
+                    print_preview_context_.metafile(),
+                    true);
   print_preview_context_.RenderedPreviewPage(
       base::TimeTicks::Now() - begin_time);
   PreviewPageRendered(page_number);
 }
 
 bool PrintWebViewHelper::PrintPages(const PrintMsg_PrintPages_Params& params,
                                     WebFrame* frame,
                                     WebNode* node) {
   printing::NativeMetafile metafile;
   if (!metafile.Init())
@@ skipping 93 matching lines @@
 
   base::TimeTicks begin_time = base::TimeTicks::Now();
   base::TimeTicks page_begin_time = begin_time;
 
   PrintMsg_PrintPage_Params page_params;
   page_params.params = printParams;
   const gfx::Size& canvas_size = prep_frame_view.GetPrintCanvasSize();
   if (params.pages.empty()) {
     for (int i = 0; i < *page_count; ++i) {
       page_params.page_number = i;
-      PrintPageInternal(page_params, canvas_size, frame, metafile);
+      PrintPageInternal(page_params, canvas_size, frame, metafile, false);
     }
   } else {
     for (size_t i = 0; i < params.pages.size(); ++i) {
       page_params.page_number = params.pages[i];
-      PrintPageInternal(page_params, canvas_size, frame, metafile);
+      PrintPageInternal(page_params, canvas_size, frame, metafile, false);
     }
   }
 
   base::TimeDelta render_time = base::TimeTicks::Now() - begin_time;
 
   prep_frame_view.FinishPrinting();
   metafile->FinishDocument();
   return true;
 }
 
 void PrintWebViewHelper::PrintPageInternal(
     const PrintMsg_PrintPage_Params& params,
     const gfx::Size& canvas_size,
     WebFrame* frame,
-    printing::Metafile* metafile) {
-  double content_width_in_points;
-  double content_height_in_points;
-  double margin_top_in_points;
-  double margin_right_in_points;
-  double margin_bottom_in_points;
-  double margin_left_in_points;
-  GetPageSizeAndMarginsInPoints(frame,
-                                params.page_number,
-                                params.params,
-                                &content_width_in_points,
-                                &content_height_in_points,
-                                &margin_top_in_points,
-                                &margin_right_in_points,
-                                &margin_bottom_in_points,
-                                &margin_left_in_points);
+    printing::Metafile* metafile,
+    bool is_preview) {
+  PageSizeMargins page_size_margins_in_points =
+      GetPageSizeAndMarginsInPoints(frame, params.page_number, params.params);
 
   gfx::Size page_size(
-      content_width_in_points + margin_right_in_points +
-          margin_left_in_points,
-      content_height_in_points + margin_top_in_points +
-          margin_bottom_in_points);
-  gfx::Rect content_area(margin_left_in_points, margin_top_in_points,
-                         content_width_in_points, content_height_in_points);
+      page_size_margins_in_points.content_width +
+          page_size_margins_in_points.margin_right +
+          page_size_margins_in_points.margin_left,
+      page_size_margins_in_points.content_height +
+          page_size_margins_in_points.margin_top +
+          page_size_margins_in_points.margin_bottom);
+
+  gfx::Rect content_area(page_size_margins_in_points.margin_left,
+                         page_size_margins_in_points.margin_top,
+                         page_size_margins_in_points.content_width,
+                         page_size_margins_in_points.content_height);
 
   SkDevice* device = metafile->StartPageForVectorCanvas(
       page_size, content_area, 1.0f);
   if (!device)
     return;
 
   // The printPage method take a reference to the canvas we pass down, so it
   // can't be a stack object.
   SkRefPtr<skia::VectorCanvas> canvas = new skia::VectorCanvas(device);
   canvas->unref();  // SkRefPtr and new both took a reference.
   printing::MetafileSkiaWrapper::SetMetafileOnCanvas(canvas.get(), metafile);
+
+  if (is_preview && params.params.display_header_footer) {
+    // The page_number count starts from '0', so, we add by '1'.

[dpapad, 2011/07/19 20:34:01]

Nit: Replace this line with 
"The page_number count starts from 0, so we add 1."
Same in print_web_view_helper_win.cc.

[Aayush Kumar, 2011/07/21 21:58:53]

Done.

+    // The scale factor on Linux is '1' which is the last parameter.
+    PrintHeaderAndFooter(device, canvas, params.page_number + 1,
+                         print_preview_context_.total_page_count(), 1,
+                         page_size_margins_in_points, header_footer_info_);
+  }
+
   frame->printPage(params.page_number, canvas.get());
 
   // TODO(myhuang): We should render the header and the footer.
 
   // Done printing. Close the device context to retrieve the compiled metafile.
   if (!metafile->FinishPage())
     NOTREACHED() << "metafile failed";
 }