Windows: Improvements to off-screen rendering support (issue #518).

- Implement support for transparency. Change the backing store to use Skia instead of GDI and to keep alpha values.
- Implement support for select popups. Requires a patch to Chromium (content_popups.patch).
- Implicitly disable accelerated compositing when using off-screen rendering.
- Introduce a new CefMouseEvent structure for representing mouse event information passed to CefBrowser methods.
- Merge cef_key_event_modifiers_t into cef_event_flags_t.
- Add a new argument to CefBrowser::Invalidate telling the browser whether to invalidate the select popup or the main view.
- Add a new cefclient "transparent-painting-enabled" command-line flag to test transparent off-screen rendering.
- Add a new cefclient "Transparency" test.
- Fix the cefclient off-screen rendering rotation effect to work even when the underlying web content is not updating.
- Add unit tests for transparent painting and select popups.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@979 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/internal/cef_types.h

@@ -975,6 +975,27 @@ enum cef_mouse_button_type_t {
   MBT_RIGHT,
 };
 
+///
+// Structure representing mouse event information.
+///
+typedef struct _cef_mouse_event_t {
+  ///
+  // X coordinate relative to the left side of the view.
+  ///
+  int x;
+
+  ///
+  // Y coordinate relative to the top side of the view.
+  ///
+  int y;
+
+  ///
+  // Bit flags describing any pressed modifier keys. See
+  // cef_event_flags_t for values.
+  ///
+  uint32 modifiers;
+} cef_mouse_event_t;
+
 ///
 // Paint element types.
 ///
@@ -988,7 +1009,7 @@ enum cef_paint_element_type_t {
 ///
 enum cef_event_flags_t {
   EVENTFLAG_NONE                = 0,
-  EVENTFLAG_CAPS_LOCK_DOWN      = 1 << 0,
+  EVENTFLAG_CAPS_LOCK_ON        = 1 << 0,
   EVENTFLAG_SHIFT_DOWN          = 1 << 1,
   EVENTFLAG_CONTROL_DOWN        = 1 << 2,
   EVENTFLAG_ALT_DOWN            = 1 << 3,
@@ -997,8 +1018,10 @@ enum cef_event_flags_t {
   EVENTFLAG_RIGHT_MOUSE_BUTTON  = 1 << 6,
   // Mac OS-X command key.
   EVENTFLAG_COMMAND_DOWN        = 1 << 7,
-  // Windows extended key (see WM_KEYDOWN doc).
-  EVENTFLAG_EXTENDED            = 1 << 8,
+  EVENTFLAG_NUM_LOCK_ON         = 1 << 8,
+  EVENTFLAG_IS_KEY_PAD          = 1 << 9,
+  EVENTFLAG_IS_LEFT             = 1 << 10,
+  EVENTFLAG_IS_RIGHT            = 1 << 11,
 };
 
 ///
@@ -1119,17 +1142,6 @@ enum cef_key_event_type_t {
   KEYEVENT_CHAR
 };
 
-///
-// Key event modifiers.
-///
-enum cef_key_event_modifiers_t {
-  KEY_SHIFT  = 1 << 0,
-  KEY_CTRL   = 1 << 1,
-  KEY_ALT    = 1 << 2,
-  KEY_META   = 1 << 3,
-  KEY_KEYPAD = 1 << 4,  // Only used on Mac OS-X
-};
-
 ///
 // Structure representing keyboard event information.
 ///
@@ -1141,9 +1153,9 @@ typedef struct _cef_key_event_t {
 
   ///
   // Bit flags describing any pressed modifier keys. See
-  // cef_key_event_modifiers_t for values.
+  // cef_event_flags_t for values.
   ///
-  int modifiers;
+  uint32 modifiers;
 
   ///
   // The Windows key code for the key event. This value is used by the DOM

include/internal/cef_types_win.h

@@ -76,6 +76,9 @@ typedef struct _cef_window_info_t {
   BOOL window_rendering_disabled;
 
   // Set to true to enable transparent painting.
+  // If window rendering is disabled and |transparent_painting| is set to true
+  // WebKit rendering will draw on a transparent background (RGBA=0x00000000).
+  // When this value is false the background will be white and opaque.
   BOOL transparent_painting;
 
   // Handle for the new browser window.

include/internal/cef_types_wrappers.h

@@ -199,6 +199,25 @@ struct CefKeyEventTraits {
 ///
 typedef CefStructBase<CefKeyEventTraits> CefKeyEvent;
 
+struct CefMouseEventTraits {
+  typedef cef_mouse_event_t struct_type;
+
+  static inline void init(struct_type* s) {}
+
+  static inline void clear(struct_type* s) {}
+
+  static inline void set(const struct_type* src, struct_type* target,
+      bool copy) {
+    target->x = src->x;
+    target->y = src->y;
+    target->modifiers = src->modifiers;
+  }
+};
+
+///
+// Class representing a mouse event.
+///
+typedef CefStructBase<CefMouseEventTraits> CefMouseEvent;
 
 struct CefPopupFeaturesTraits {
   typedef cef_popup_features_t struct_type;