drm-buffer: Keep track of handle as well

This handle is used by the legacy KMS API; lets avoid having to have GBM
specific code where this is done by letting the MetaDrmBuffer API, that
already has this information, expose it.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2275>

src/backends/native/meta-drm-buffer-dumb.c

@@ -248,6 +248,7 @@ init_dumb_buffer (MetaDrmBufferDumb  *buffer_dumb,
     .width = width,
     .height = height,
     .format = format,
+    .handle = create_arg.handle,
     .handles = { create_arg.handle },
     .strides = { create_arg.pitch },
   };

src/backends/native/meta-drm-buffer-gbm.c

@@ -164,6 +164,7 @@ meta_drm_buffer_gbm_ensure_fb_id (MetaDrmBuffer  *buffer,
   fb_args.width = gbm_bo_get_width (bo);
   fb_args.height = gbm_bo_get_height (bo);
   fb_args.format = gbm_bo_get_format (bo);
+  fb_args.handle = gbm_bo_get_handle (bo).u32;
 
   if (!meta_drm_buffer_do_ensure_fb_id (META_DRM_BUFFER (buffer_gbm),
                                         &fb_args, error))

src/backends/native/meta-drm-buffer-import.c

@@ -162,6 +162,7 @@ import_gbm_buffer (MetaDrmBufferImport  *buffer_import,
   fb_args.width = gbm_bo_get_width (primary_bo);
   fb_args.height = gbm_bo_get_height (primary_bo);
   fb_args.format = gbm_bo_get_format (primary_bo);
+  fb_args.handle = gbm_bo_get_handle (primary_bo).u32;
 
   imported_bo = dmabuf_to_gbm_bo (importer,
                                   dmabuf_fd,

src/backends/native/meta-drm-buffer-private.h

@@ -33,6 +33,7 @@ typedef struct _MetaDrmFbArgs
   uint32_t offsets[4];
   uint32_t strides[4];
   uint64_t modifiers[4];
+  uint32_t handle;
 } MetaDrmFbArgs;
 
 struct _MetaDrmBufferClass

src/backends/native/meta-drm-buffer.c

@@ -53,6 +53,7 @@ typedef struct _MetaDrmBufferPrivate
   MetaDrmBufferFlags flags;
 
   uint32_t fb_id;
+  uint32_t handle;
 } MetaDrmBufferPrivate;
 
 G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (MetaDrmBuffer, meta_drm_buffer,
@@ -152,6 +153,8 @@ meta_drm_buffer_do_ensure_fb_id (MetaDrmBuffer        *buffer,
     }
 
   priv->fb_id = fb_id;
+  priv->handle = fb_args->handle;
+
   return TRUE;
 }
 
@@ -185,6 +188,14 @@ meta_drm_buffer_get_fb_id (MetaDrmBuffer *buffer)
   return priv->fb_id;
 }
 
+uint32_t
+meta_drm_buffer_get_handle (MetaDrmBuffer *buffer)
+{
+  MetaDrmBufferPrivate *priv = meta_drm_buffer_get_instance_private (buffer);
+
+  return priv->handle;
+}
+
 int
 meta_drm_buffer_get_width (MetaDrmBuffer *buffer)
 {

src/backends/native/meta-drm-buffer.h

@@ -50,6 +50,8 @@ gboolean meta_drm_buffer_ensure_fb_id (MetaDrmBuffer  *buffer,
 
 uint32_t meta_drm_buffer_get_fb_id (MetaDrmBuffer *buffer);
 
+uint32_t meta_drm_buffer_get_handle (MetaDrmBuffer *buffer);
+
 int meta_drm_buffer_get_width (MetaDrmBuffer *buffer);
 
 int meta_drm_buffer_get_height (MetaDrmBuffer *buffer);