WaylandBackend: copying to primary selection

This is an extension of the previous commit, also forwarding the primary
selection to the host. This does not add support for accessing the
host's primary selection internally.

protocol/meson.build

@@ -19,6 +19,7 @@ protocols = [
 	wl_protocol_dir / 'staging/single-pixel-buffer/single-pixel-buffer-v1.xml',
 	wl_protocol_dir / 'unstable/pointer-constraints/pointer-constraints-unstable-v1.xml',
 	wl_protocol_dir / 'unstable/relative-pointer/relative-pointer-unstable-v1.xml',
+	wl_protocol_dir / 'unstable/primary-selection/primary-selection-unstable-v1.xml',
 	wl_protocol_dir / 'staging/fractional-scale/fractional-scale-v1.xml',
 	wl_protocol_dir / 'staging/linux-drm-syncobj/linux-drm-syncobj-v1.xml',
 

src/Backends/WaylandBackend.cpp

@@ -32,6 +32,7 @@
 #include <xx-color-management-v3-client-protocol.h>
 #include <pointer-constraints-unstable-v1-client-protocol.h>
 #include <relative-pointer-unstable-v1-client-protocol.h>
+#include <primary-selection-unstable-v1-client-protocol.h>
 #include <fractional-scale-v1-client-protocol.h>
 #include <xdg-toplevel-icon-v1-client-protocol.h>
 #include "wlr_end.hpp"
@@ -644,6 +645,10 @@ namespace gamescope
         void Wayland_DataSource_Cancelled( struct wl_data_source *pSource );
         static const wl_data_source_listener s_DataSourceListener;
 
+        void Wayland_PrimarySelectionSource_Send( struct zwp_primary_selection_source_v1 *pSource, const char *pMime, int nFd );
+        void Wayland_PrimarySelectionSource_Cancelled( struct zwp_primary_selection_source_v1 *pSource );
+        static const zwp_primary_selection_source_v1_listener s_PrimarySelectionSourceListener;
+
         CWaylandInputThread m_InputThread;
 
         CWaylandConnector m_Connector;
@@ -673,6 +678,10 @@ namespace gamescope
         wl_data_device *m_pDataDevice = nullptr;
         std::shared_ptr<std::string> m_pClipboard = nullptr;
 
+        zwp_primary_selection_device_manager_v1 *m_pPrimarySelectionDeviceManager = nullptr;
+        zwp_primary_selection_device_v1 *m_pPrimarySelectionDevice = nullptr;
+        std::shared_ptr<std::string> m_pPrimarySelection = nullptr;
+
         struct 
         {
             std::vector<xx_color_manager_v3_primaries> ePrimaries;
@@ -766,6 +775,11 @@ namespace gamescope
         .send      = WAYLAND_USERDATA_TO_THIS( CWaylandBackend, Wayland_DataSource_Send ),
         .cancelled = WAYLAND_USERDATA_TO_THIS( CWaylandBackend, Wayland_DataSource_Cancelled ),
     };
+    const zwp_primary_selection_source_v1_listener CWaylandBackend::s_PrimarySelectionSourceListener =
+    {
+        .send      = WAYLAND_USERDATA_TO_THIS( CWaylandBackend, Wayland_PrimarySelectionSource_Send ),
+        .cancelled = WAYLAND_USERDATA_TO_THIS( CWaylandBackend, Wayland_PrimarySelectionSource_Cancelled ),
+    };
 
     //////////////////
     // CWaylandFb
@@ -2019,9 +2033,12 @@ namespace gamescope
     }
     void CWaylandBackend::SetSelection( std::shared_ptr<std::string> szContents, GamescopeSelection eSelection )
     {
-        if ( !m_pDataDevice )
+        if ( m_pDataDeviceManager && !m_pDataDevice )
             m_pDataDevice = wl_data_device_manager_get_data_device( m_pDataDeviceManager, m_pSeat );
 
+        if ( m_pPrimarySelectionDeviceManager && !m_pPrimarySelectionDevice )
+            m_pPrimarySelectionDevice = zwp_primary_selection_device_manager_v1_get_device( m_pPrimarySelectionDeviceManager, m_pSeat );
+
         if ( eSelection == GAMESCOPE_SELECTION_CLIPBOARD && m_pDataDevice )
         {
             m_pClipboard = szContents;
@@ -2030,9 +2047,13 @@ namespace gamescope
             wl_data_source_offer( source, "text/plain" );
             wl_data_device_set_selection( m_pDataDevice, source, m_uKeyboardEnterSerial );
         }
-        else if ( eSelection == GAMESCOPE_SELECTION_PRIMARY )
+        else if ( eSelection == GAMESCOPE_SELECTION_PRIMARY && m_pPrimarySelectionDevice )
         {
-            // Do nothing
+            m_pPrimarySelection = szContents;
+            struct zwp_primary_selection_source_v1 *source = zwp_primary_selection_device_manager_v1_create_source( m_pPrimarySelectionDeviceManager );
+            zwp_primary_selection_source_v1_add_listener( source, &s_PrimarySelectionSourceListener, this );
+            zwp_primary_selection_source_v1_offer( source, "text/plain" );
+            zwp_primary_selection_device_v1_set_selection( m_pPrimarySelectionDevice, source, m_uPointerEnterSerial );
         }
     }
 
@@ -2215,6 +2236,10 @@ namespace gamescope
         {
             m_pDataDeviceManager = (wl_data_device_manager *)wl_registry_bind( pRegistry, uName, &wl_data_device_manager_interface, 3u );
         }
+        else if ( !strcmp( pInterface, zwp_primary_selection_device_manager_v1_interface.name ) )
+        {
+            m_pPrimarySelectionDeviceManager = (zwp_primary_selection_device_manager_v1 *)wl_registry_bind( pRegistry, uName, &zwp_primary_selection_device_manager_v1_interface, 1u );
+        }
     }
 
     void CWaylandBackend::Wayland_Modifier( zwp_linux_dmabuf_v1 *pDmabuf, uint32_t uFormat, uint32_t uModifierHi, uint32_t uModifierLo )
@@ -2368,6 +2393,20 @@ namespace gamescope
         wl_data_source_destroy( pSource );
     }
 
+    // Primary Selection Source
+
+    void CWaylandBackend::Wayland_PrimarySelectionSource_Send( struct zwp_primary_selection_source_v1 *pSource, const char *pMime, int nFd )
+    {
+	ssize_t len = m_pPrimarySelection->length();
+        if ( write( nFd, m_pPrimarySelection->c_str(), len ) != len )
+	    xdg_log.infof( "Failed to write all %zd bytes to clipboard", len );
+        close( nFd );
+    }
+    void CWaylandBackend::Wayland_PrimarySelectionSource_Cancelled( struct zwp_primary_selection_source_v1 *pSource)
+    {
+        zwp_primary_selection_source_v1_destroy( pSource );
+    }
+
     ///////////////////////
     // CWaylandInputThread
     ///////////////////////