Improved Pinch-Zoom for PDF

pdf/out_of_process_instance.h

Index: pdf/out_of_process_instance.h
diff --git a/pdf/out_of_process_instance.h b/pdf/out_of_process_instance.h
index 0842d33bde12371729a40d223757931d066b80a1..2c71d7eb453fecdc464cb77a0b32b1ae3f2740f7 100644
--- a/pdf/out_of_process_instance.h
+++ b/pdf/out_of_process_instance.h
@@ -222,9 +222,17 @@ class OutOfProcessInstance : public pp::Instance,
   // there are 10 pages, the height will be 8000).
   pp::Size document_size_;
 
-  double zoom_;  // Current zoom factor.
-
-  float device_scale_;  // Current device scale factor.
+  // Current zoom factor.
+  double zoom_;
+  double old_zoom_, initial_zoom_delta_;
+  // True if we request a new bitmap rendering.
+  int do_render_;

[wjmaclean, 2016/04/21 14:11:02]

Make do_render_ bool.

[alessandroa, 2016/04/22 14:33:05]

Done.

+  // Scroll at the begining of zooming.
+  pp::FloatPoint last_current_scroll_;
+  // True if last bitmap was smaller then screen.

[wjmaclean, 2016/04/21 14:11:02]

"then" -> "than"

By "screen", we mean the PDF display area in the tab?

[alessandroa, 2016/04/22 14:33:05]

Done. Yep, if the pdf document size is smaller then the page that means we had
the grey parts and we must deal with the document little bit different.

+  bool was_smaller_;
+  // Current device scale factor.
+  float device_scale_;
   // True if the plugin is full-page.
   bool full_;