client: support clipboard/selection-owner model (v2)

-includes most of Hans' review fixes (up to the SelectionRequest comment [4]) & X11 wips sent by Hans (10x!)
-use the VD_AGENT_CLIPBOARD_* types in the platform code
-add ifs for VD_AGENT_CAP_CLIPBOARD_BY_DEMAND in both sides
-support the GRAB/REQUEST/DATA/RELEASE verbs in both ways
-pasting clipboard data is now "only-by-demand" from both sides (client and agent), whose behavior is symmetric
-client and agent don't read or send the contents of the clipboard unnecessarily (e.g. copy, internal paste, repeating paste, focus change)
-set client as clipboard listener instead of application
-add atexit(cleanup) in win platform

linux:
-instead of clipboard atom selection instead of XA_PRIMARY
-enable USE_XRANDR_1_2 and support clipboard in MultyMonScreen
-send utf8 with no null termination, remove ++size
-add xfixes in configure.ac & Makefile.am

windows:
-bonus: support image cut & paste, currently only on windows

not done yet:
-clipboards formats are still uint32_t, not mime types stores as strings
-platform_win is still used, not the root window
-not replaced the ugly windows CF_DIB in agent/winclient

1 files changed, 6 insertions, 7 deletions

diff --git a/client/platform.h b/client/platform.h
index 6288380a..47278893 100644
--- a/client/platform.h
+++ b/client/platform.h
@@ -121,13 +121,10 @@ public:
     class ClipboardListener;
     static void set_clipboard_listener(ClipboardListener* listener);
 
-    enum {
-        CLIPBOARD_UTF8_TEXT = 1,
-    };
-
+    static bool set_clipboard_owner(uint32_t type);
     static bool set_clipboard_data(uint32_t type, const uint8_t* data, int32_t size);
-    static bool get_clipboard_data(uint32_t type, uint8_t* data, int32_t size);
-    static int32_t get_clipboard_data_size(uint32_t type);
+    static bool request_clipboard_notification(uint32_t type);
+    static void release_clipboard();
 };
 
 class Platform::EventListener {
@@ -141,7 +138,9 @@ public:
 class Platform::ClipboardListener {
 public:
     virtual ~ClipboardListener() {}
-    virtual void on_clipboard_change() = 0;
+    virtual void on_clipboard_grab(uint32_t type) = 0;
+    virtual void on_clipboard_request(uint32_t type) = 0;
+    virtual void on_clipboard_notify(uint32_t type, uint8_t* data, int32_t size) = 0;
 };
 
 class Platform::RecordClient {