picture: copy picture context in picture_Copy() (fixes #14456)

include/vlc_picture.h

@@ -59,6 +59,7 @@ typedef struct plane_t
 typedef struct picture_context_t
 {
     void (*destroy)(struct picture_context_t *);
+    struct picture_context_t *(*copy)(struct picture_context_t *);
 } picture_context_t;
 
 /**

modules/hw/vdpau/picture.c

@@ -65,7 +65,7 @@ static picture_context_t *SurfaceCopy(picture_context_t *ctx)
         return NULL;
 
     fnew->context.destroy = SurfaceDestroy;
-    fnew->copy = SurfaceCopy;
+    fnew->context.copy = SurfaceCopy;
     fnew->frame = frame;
     fnew->structure = fold->structure;
     fnew->procamp = fold->procamp;
@@ -98,7 +98,7 @@ vlc_vdp_video_field_t *vlc_vdp_video_create(vdp_t *vdp,
     }
 
     field->context.destroy = SurfaceDestroy;
-    field->copy = SurfaceCopy;
+    field->context.copy = SurfaceCopy;
     field->frame = frame;
     field->structure = VDP_VIDEO_MIXER_PICTURE_STRUCTURE_FRAME;
     field->procamp = procamp_default;

modules/hw/vdpau/vlc_vdpau.h

@@ -274,7 +274,6 @@ typedef struct vlc_vdp_video_frame
 typedef struct vlc_vdp_video_field
 {
     picture_context_t context;
-    struct picture_context_t *(*copy)(struct picture_context_t *);
     vlc_vdp_video_frame_t *frame;
     VdpVideoMixerPictureStructure structure;
     VdpProcamp procamp;
@@ -303,6 +302,6 @@ static inline void vlc_vdp_video_destroy(vlc_vdp_video_field_t *f)
 static inline vlc_vdp_video_field_t *vlc_vdp_video_copy(
     vlc_vdp_video_field_t *fold)
 {
-    return (vlc_vdp_video_field_t *)fold->copy(&fold->context);
+    return (vlc_vdp_video_field_t *)fold->context.copy(&fold->context);
 }
 #endif

src/misc/picture.c

@@ -368,6 +368,11 @@ void picture_CopyPixels( picture_t *p_dst, const picture_t *p_src )
 {
     for( int i = 0; i < p_src->i_planes ; i++ )
         plane_CopyPixels( p_dst->p+i, p_src->p+i );
+
+    assert( p_dst->context == NULL );
+
+    if( p_src->context != NULL )
+        p_dst->context = p_src->context->copy( p_src->context );
 }
 
 void picture_Copy( picture_t *p_dst, const picture_t *p_src )