Fix fit to page scaling display for landscape

components/printing/renderer/print_web_view_helper.cc

 // 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 "components/printing/renderer/print_web_view_helper.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1242 matching lines @@
       ConvertUnit(print_params.printable_area.height(), dpi, kPointsPerInch));
 
   double fit_to_page_scale_factor = 1.0f;
   if (!print_preview_context_.IsModifiable()) {
     blink::WebLocalFrame* source_frame = print_preview_context_.source_frame();
     const blink::WebNode& source_node = print_preview_context_.source_node();
     blink::WebPrintPresetOptions preset_options;
     if (source_frame->getPrintPresetOptionsForPlugin(source_node,
                                                      &preset_options)) {
       if (preset_options.isPageSizeUniform) {
+        // Figure out if the sizes have the same orientation
+        bool is_printable_area_landscape = printable_area_in_points.width() >
+                                           printable_area_in_points.height();
+        bool is_preset_landscape = preset_options.uniformPageSize.width >
+                                   preset_options.uniformPageSize.height;
+        bool rotate = is_printable_area_landscape != is_preset_landscape;
+        // Match orientation for computing scaling
+        double printable_width = rotate ? printable_area_in_points.height()
+                                        : printable_area_in_points.width();
+        double printable_height = rotate ? printable_area_in_points.width()
+                                         : printable_area_in_points.height();
         double scale_width =
-            static_cast<double>(printable_area_in_points.width()) /
+            printable_width /
             static_cast<double>(preset_options.uniformPageSize.width);
         double scale_height =
-            static_cast<double>(printable_area_in_points.height()) /
+            printable_height /
             static_cast<double>(preset_options.uniformPageSize.height);
         fit_to_page_scale_factor = std::min(scale_width, scale_height);
       } else {
         fit_to_page_scale_factor = 0.0f;
       }
     }
   }
   int fit_to_page_scaling = static_cast<int>(100.0f * fit_to_page_scale_factor);
   // Margins: Send default page layout to browser process.
   Send(new PrintHostMsg_DidGetDefaultPageLayout(routing_id(),
@@ skipping 1082 matching lines @@
       blink::WebConsoleMessage::LevelWarning, message));
   return false;
 }
 
 void PrintWebViewHelper::ScriptingThrottler::Reset() {
   // Reset counter on successful print.
   count_ = 0;
 }
 
 }  // namespace printing