Added Header and Footer support using Skia

chrome/renderer/print_web_view_helper.h

 // 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.
 
 #ifndef CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #define CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #pragma once
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/time.h"
+#include "base/utf_string_conversions.h"
+#include "base/values.h"
 #include "content/renderer/render_view_observer.h"
 #include "content/renderer/render_view_observer_tracker.h"
 #include "printing/metafile.h"
+#include "skia/ext/vector_canvas.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+#include "third_party/skia/include/core/SkScalar.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "ui/gfx/size.h"
 
 struct PrintMsg_Print_Params;
 struct PrintMsg_PrintPage_Params;
 struct PrintMsg_PrintPages_Params;
 
 namespace base {
 class DictionaryValue;
@@ skipping 32 matching lines @@
   gfx::Size print_canvas_size_;
   gfx::Size prev_view_size_;
   gfx::Size prev_scroll_offset_;
   int expected_pages_count_;
   bool use_browser_overlays_;
   bool finished_;
 
   DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
 };
 
+typedef struct PageSizeMargins {
+  double content_width;
+  double content_height;
+  double margin_top;
+  double margin_right;
+  double margin_bottom;
+  double margin_left;
+} PageSizeMargins;
+
+void PrintHeaderAndFooter(SkDevice *device,

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

Document function and parameters.

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

Done.

+                          const SkRefPtr<skia::VectorCanvas>& canvas,
+                          int page_number, int total_pages,
+                          float webkit_scale_factor,
+                          PageSizeMargins& page_size_margins,
+                          const DictionaryValue* header_footer_info);
+
 // PrintWebViewHelper handles most of the printing grunt work for RenderView.
 // We plan on making print asynchronous and that will require copying the DOM
 // of the document and creating a new WebView with the contents.
 class PrintWebViewHelper : public RenderViewObserver,
                            public RenderViewObserverTracker<PrintWebViewHelper>,
                            public WebKit::WebViewClient,
                            public WebKit::WebFrameClient {
  public:
   explicit PrintWebViewHelper(RenderView* render_view);
   virtual ~PrintWebViewHelper();
@@ skipping 24 matching lines @@
 
   // Message handlers ---------------------------------------------------------
 
   // Print the document.
   void OnPrintPages();
 
   // Initiate print preview.
   void OnInitiatePrintPreview();
 
   // Start the process of generating a print preview using |settings|.
-  void OnPrintPreview(const base::DictionaryValue& settings);
+  // |header_footer_info| contains the necessary strings generated by the
+  // browser process to be printed as headers and footers if requested by the
+  // user.
+  void OnPrintPreview(const base::DictionaryValue& settings,
+                      const DictionaryValue& header_footer_info);
   // Initialize the print preview document.
   bool CreatePreviewDocument();
 
   // Continue generating the print preview.
   void OnContinuePreview();
   // Renders a print preview page. |page_number| is 0-based.
   void RenderPreviewPage(int page_number);
   // Finalize the print preview document.
   bool FinalizePreviewDocument();
 
@@ skipping 57 matching lines @@
   // It will implicitly revert the document to display CSS media type.
   bool PrintPages(const PrintMsg_PrintPages_Params& params,
                   WebKit::WebFrame* frame,
                   WebKit::WebNode* node);
 
   // Prints the page listed in |params|.
 #if defined(USE_X11)
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
                          const gfx::Size& canvas_size,
                          WebKit::WebFrame* frame,
-                         printing::Metafile* metafile);
+                         printing::Metafile* metafile,
+                         bool is_preview);
 #else
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
                          const gfx::Size& canvas_size,
                          WebKit::WebFrame* frame);
 #endif
 
   // Render the frame for printing.
   bool RenderPagesForPrint(WebKit::WebFrame* frame, WebKit::WebNode* node);
 
   // Platform specific helper function for rendering page(s) to |metafile|.
@@ skipping 11 matching lines @@
                    int* page_count, printing::Metafile* metafile);
 #endif  // defined(OS_WIN)
 
   // Helper methods -----------------------------------------------------------
 
   bool CopyAndPrint(WebKit::WebFrame* web_frame);
 
   bool CopyMetafileDataToSharedMem(printing::Metafile* metafile,
                                    base::SharedMemoryHandle* shared_mem_handle);
 
-  void GetPageSizeAndMarginsInPoints(
+  PageSizeMargins GetPageSizeAndMarginsInPoints(

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

It looks like this change is orthogonal to your header and footer change.  Maybe
it would be better to pull it into a different CL.

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

I am creating another CL for this, and will remove these changes after the code
rebase :)
On 2011/07/19 21:31:20, vandebo wrote:

[vandebo (ex-Chrome), 2011/07/22 22:58:33]

Can you do that rebase?  It'll be easier to review the code without this stuff
in the diff.  Ask if you want help managing multiple CLs

On 2011/07/21 21:58:53, Aayush Kumar wrote:

[Aayush Kumar, 2011/07/24 02:09:02]

Done.

[Aayush Kumar, 2011/07/24 02:09:02]

CL number: 7492031
On 2011/07/22 22:58:33, vandebo wrote:

       WebKit::WebFrame* frame,
       int page_index,
-      const PrintMsg_Print_Params& default_params,
-      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);
+      const PrintMsg_Print_Params& default_params);
 
   void UpdatePrintableSizeInPrintParameters(WebKit::WebFrame* frame,
                                             WebKit::WebNode* node,
                                             PrintMsg_Print_Params* params);
 
   bool GetPrintFrame(WebKit::WebFrame** frame);
 
   // This reports the current time - |start_time| as the time to render a page.
   void ReportPreviewPageRenderTime(base::TimeTicks start_time);
 
@@ skipping 27 matching lines @@
   // Used for scripted initiated printing blocking.
   base::Time last_cancelled_script_print_;
   int user_cancelled_scripted_print_count_;
 
   // Let the browser process know of a printing failure. Only set to false when
   // the failure came from the browser in the first place.
   bool notify_browser_of_print_failure_;
 
   scoped_ptr<PrintMsg_PrintPages_Params> old_print_pages_params_;
 
+  // Contains strings generated by the browser process to be printed as headers
+  // and footers if requested by the user.
+  const DictionaryValue* header_footer_info_;
+
   // Keeps track of the state of print preview between messages.
   class PrintPreviewContext {
    public:
     PrintPreviewContext();
     ~PrintPreviewContext();
 
     // Initializes the print preview context. Need to be called to set
     // the |web_frame| / |web_node| to generate the print preview for.
     void InitWithFrame(WebKit::WebFrame* web_frame);
     void InitWithNode(const WebKit::WebNode& web_node);
@@ skipping 68 matching lines @@
 
     State state_;
   };
 
   PrintPreviewContext print_preview_context_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };
 
 #endif  // CHROME_RENDERER_PRINT_WEB_VIEW_HELPER_H_