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drm-buffer: Add API to export buffer file descriptor

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Practically ends up in gbm_bo_get_fd(). For dumb buffer, an
'unsupported' error is returned.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1854>
This commit is contained in:
Jonas Ådahl 2021-05-05 11:19:13 +02:00
parent 6ba86366b3
commit a1266e19f4
5 changed files with 50 additions and 0 deletions
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10
src/backends/native/meta-drm-buffer-dumb.c
View File

@ -50,6 +50,15 @@ struct _MetaDrmBufferDumb
G_DEFINE_TYPE (MetaDrmBufferDumb, meta_drm_buffer_dumb, META_TYPE_DRM_BUFFER)
static int
meta_drm_buffer_dumb_export_fd (MetaDrmBuffer *buffer,
GError **error)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
"Can't export fd for dumb buffer");
return -1;
}
static int
meta_drm_buffer_dumb_get_width (MetaDrmBuffer *buffer)
{
@ -362,6 +371,7 @@ meta_drm_buffer_dumb_class_init (MetaDrmBufferDumbClass *klass)
object_class->finalize = meta_drm_buffer_dumb_finalize;
buffer_class->export_fd = meta_drm_buffer_dumb_export_fd;
buffer_class->get_width = meta_drm_buffer_dumb_get_width;
buffer_class->get_height = meta_drm_buffer_dumb_get_height;
buffer_class->get_stride = meta_drm_buffer_dumb_get_stride;

19
src/backends/native/meta-drm-buffer-gbm.c
View File

@ -57,6 +57,24 @@ meta_drm_buffer_gbm_get_bo (MetaDrmBufferGbm *buffer_gbm)
return buffer_gbm->bo;
}
static int
meta_drm_buffer_gbm_export_fd (MetaDrmBuffer *buffer,
GError **error)
{
MetaDrmBufferGbm *buffer_gbm = META_DRM_BUFFER_GBM (buffer);
int fd;
fd = gbm_bo_get_fd (buffer_gbm->bo);
if (fd == -1)
{
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno),
"Failed to export buffer fd: %s", g_strerror (errno));
return -1;
}
return fd;
}
static int
meta_drm_buffer_gbm_get_width (MetaDrmBuffer *buffer)
{
@ -491,6 +509,7 @@ meta_drm_buffer_gbm_class_init (MetaDrmBufferGbmClass *klass)
object_class->finalize = meta_drm_buffer_gbm_finalize;
buffer_class->export_fd = meta_drm_buffer_gbm_export_fd;
buffer_class->get_width = meta_drm_buffer_gbm_get_width;
buffer_class->get_height = meta_drm_buffer_gbm_get_height;
buffer_class->get_stride = meta_drm_buffer_gbm_get_stride;

11
src/backends/native/meta-drm-buffer-import.c
View File

@ -44,6 +44,16 @@ struct _MetaDrmBufferImport
G_DEFINE_TYPE (MetaDrmBufferImport, meta_drm_buffer_import,
META_TYPE_DRM_BUFFER)
static int
meta_drm_buffer_import_export_fd (MetaDrmBuffer *buffer,
GError **error)
{
MetaDrmBufferImport *buffer_import = META_DRM_BUFFER_IMPORT (buffer);
return meta_drm_buffer_export_fd (META_DRM_BUFFER (buffer_import->importee),
error);
}
static int
meta_drm_buffer_import_get_width (MetaDrmBuffer *buffer)
{
@ -229,6 +239,7 @@ meta_drm_buffer_import_class_init (MetaDrmBufferImportClass *klass)
object_class->finalize = meta_drm_buffer_import_finalize;
buffer_class->export_fd = meta_drm_buffer_import_export_fd;
buffer_class->get_width = meta_drm_buffer_import_get_width;
buffer_class->get_height = meta_drm_buffer_import_get_height;
buffer_class->get_stride = meta_drm_buffer_import_get_stride;

7
src/backends/native/meta-drm-buffer.c
View File

@ -158,6 +158,13 @@ meta_drm_buffer_release_fb_id (MetaDrmBuffer *buffer)
priv->fb_id = 0;
}
int
meta_drm_buffer_export_fd (MetaDrmBuffer *buffer,
GError **error)
{
return META_DRM_BUFFER_GET_CLASS (buffer)->export_fd (buffer, error);
}
uint32_t
meta_drm_buffer_get_fb_id (MetaDrmBuffer *buffer)
{

3
src/backends/native/meta-drm-buffer.h
View File

@ -40,6 +40,9 @@ G_DECLARE_DERIVABLE_TYPE (MetaDrmBuffer,
META, DRM_BUFFER,
GObject)
int meta_drm_buffer_export_fd (MetaDrmBuffer *buffer,
GError **error);
uint32_t meta_drm_buffer_get_fb_id (MetaDrmBuffer *buffer);
int meta_drm_buffer_get_width (MetaDrmBuffer *buffer);