Print headers and footers with WebKit.

chrome/renderer/print_web_view_helper_mac.mm

 // Copyright (c) 2012 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"
 
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
@@ skipping 134 matching lines @@
 
   ComputePageLayoutInPointsForCss(frame, page_number, params,
                                   ignore_css_margins_, &scale_factor,
                                   &page_layout_in_points);
   GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, page_size,
                                           &content_area);
   if (content_rect)
     *content_rect = content_area;
 
   scale_factor *= webkit_shrink_factor;
+
+  gfx::Rect canvas_area =
+      params.display_header_footer ? gfx::Rect(*page_size) : content_area;
+
   {
 #if defined(USE_SKIA)
     SkDevice* device = metafile->StartPageForVectorCanvas(
-        *page_size, content_area, scale_factor);
+        *page_size, canvas_area, scale_factor);
     if (!device)
       return;
 
     SkRefPtr<skia::VectorCanvas> canvas = new skia::VectorCanvas(device);
     canvas->unref();  // SkRefPtr and new both took a reference.
     WebKit::WebCanvas* canvas_ptr = canvas.get();
     printing::MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
     skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
     skia::SetIsPreviewMetafile(*canvas, is_preview);
 #else

[Alexei Svitkine (slow), 2012/11/02 18:19:14]

You can delete the #else block here and remove the ifdef, since USE_SKIA is
always true for Mac now.

-    bool success = metafile->StartPage(*page_size, content_area, scale_factor);
+    bool success = metafile->StartPage(*page_size, canvas_area, scale_factor);
     DCHECK(success);
     // printPage can create autoreleased references to |context|. PDF contexts
     // don't write all their data until they are destroyed, so we need to make
     // certain that there are no lingering references.
     base::mac::ScopedNSAutoreleasePool pool;
     CGContextRef cgContext = metafile->context();
     CGContextRef canvas_ptr = cgContext;
 
-    // For CoreGraphics, print in the margins before printing in the content
-    // area so that we don't spill over. Webkit draws a white background in the
-    // content area and this acts as a clip.
-    // TODO(aayushkumar): Combine the calls to PrintHeaderAndFooter once we
-    // can draw in the margins safely in Skia in any order.
+#endif  // !USE_SKIA
     if (print_pages_params_->params.display_header_footer) {
       PrintHeaderAndFooter(canvas_ptr, page_number + 1,
                            print_preview_context_.total_page_count(),
                            scale_factor, page_layout_in_points,
                            *header_footer_info_, params);
     }
-#endif  // !USE_SKIA
+    canvas_ptr->translate((content_area.x() - canvas_area.x()) / scale_factor,
+                          (content_area.y() - canvas_area.y()) / scale_factor);
 
     frame->printPage(page_number, canvas_ptr);
-
-#if defined(USE_SKIA)
-    if (print_pages_params_->params.display_header_footer) {
-      // |page_number| is 0-based, so 1 is added.
-      PrintHeaderAndFooter(canvas_ptr, page_number + 1,
-                           print_preview_context_.total_page_count(),
-                           scale_factor, page_layout_in_points,
-                           *header_footer_info_, params);
-    }
-#endif  // defined(USE_SKIA)
   }
 
   // Done printing. Close the device context to retrieve the compiled metafile.
   metafile->FinishPage();
 }