On 08/07/2013 10:39 AM, Kristian Høgsberg wrote:
On Thu, Jul 18, 2013 at 03:11:25PM +0300, Ander Conselvan de Oliveira wrote:
Since Wayland 1.2, struct wl_buffer and a few functions are deprecated.

References to wl_buffer are replaced with wl_resource and some getter
functions and calls to deprecated functions are replaced with the proper
new API. The latter changes are related to resource versioning.

Signed-off-by: Ander Conselvan de Oliveira 
<ander.conselvan.de.olive...@intel.com>

Thanks Ander, this and the two previous patches pushed.

If any patches need to be picked back to the 9.2 branch (or 9.1 branch), please send them to mesa-stable. I don't follow the Wayland work very closely, so I defer to Kristian's guidance.

Kristian

---
  docs/specs/WL_bind_wayland_display.spec            |  8 ++-
  include/EGL/eglmesaext.h                           |  6 +-
  src/egl/drivers/dri2/egl_dri2.c                    | 28 +++++----
  src/egl/drivers/dri2/egl_dri2.h                    |  1 -
  src/egl/main/eglapi.c                              |  2 +-
  src/egl/main/eglapi.h                              |  2 +-
  src/egl/wayland/wayland-drm/wayland-drm.c          | 66 +++++++++++++---------
  src/egl/wayland/wayland-drm/wayland-drm.h          | 13 +++--
  .../state_trackers/egl/common/egl_g3d_api.c        |  2 +-
  .../state_trackers/egl/common/egl_g3d_image.c      |  4 +-
  .../egl/common/native_wayland_bufmgr.h             |  6 +-
  .../egl/common/native_wayland_drm_bufmgr.c         | 25 +++++---
  src/gbm/backends/dri/gbm_dri.c                     |  5 +-
  13 files changed, 99 insertions(+), 69 deletions(-)

diff --git a/docs/specs/WL_bind_wayland_display.spec 
b/docs/specs/WL_bind_wayland_display.spec
index 02bd6ea..8f0083c 100644
--- a/docs/specs/WL_bind_wayland_display.spec
+++ b/docs/specs/WL_bind_wayland_display.spec
@@ -17,7 +17,7 @@ Status

  Version

-    Version 1, March 1, 2011
+    Version 5, July 16, 2013

  Number

@@ -57,7 +57,7 @@ New Procedures and Functions
                                           struct wl_display *display);

      EGLBoolean eglQueryWaylandBufferWL(EGLDisplay dpy,
-                                       struct wl_buffer *buffer,
+                                       struct wl_resource *buffer,
                                         EGLint attribute, EGLint *value);

  New Tokens
@@ -173,3 +173,7 @@ Revision History
          Use EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB, and EGL_TEXTURE_RGBA,
          and just define the new YUV texture formats.  Add support for
          EGL_WIDTH and EGL_HEIGHT in the query attributes (Kristian Høgsberg)
+    Version 5, July 16, 2013
+        Change eglQueryWaylandBufferWL to take a resource pointer to the
+        buffer instead of a pointer to a struct wl_buffer, as the latter has
+        been deprecated. (Ander Conselvan de Oliveira)
diff --git a/include/EGL/eglmesaext.h b/include/EGL/eglmesaext.h
index d476d18..e0eae28 100644
--- a/include/EGL/eglmesaext.h
+++ b/include/EGL/eglmesaext.h
@@ -120,15 +120,15 @@ typedef EGLDisplay (EGLAPIENTRYP PFNEGLGETDRMDISPLAYMESA) 
(int fd);
  #define EGL_TEXTURE_Y_XUXV_WL           0x31D9

  struct wl_display;
-struct wl_buffer;
+struct wl_resource;
  #ifdef EGL_EGLEXT_PROTOTYPES
  EGLAPI EGLBoolean EGLAPIENTRY eglBindWaylandDisplayWL(EGLDisplay dpy, struct 
wl_display *display);
  EGLAPI EGLBoolean EGLAPIENTRY eglUnbindWaylandDisplayWL(EGLDisplay dpy, 
struct wl_display *display);
-EGLAPI EGLBoolean EGLAPIENTRY eglQueryWaylandBufferWL(EGLDisplay dpy, struct 
wl_buffer *buffer, EGLint attribute, EGLint *value);
+EGLAPI EGLBoolean EGLAPIENTRY eglQueryWaylandBufferWL(EGLDisplay dpy, struct 
wl_resource *buffer, EGLint attribute, EGLint *value);
  #endif
  typedef EGLBoolean (EGLAPIENTRYP PFNEGLBINDWAYLANDDISPLAYWL) (EGLDisplay dpy, 
struct wl_display *display);
  typedef EGLBoolean (EGLAPIENTRYP PFNEGLUNBINDWAYLANDDISPLAYWL) (EGLDisplay 
dpy, struct wl_display *display);
-typedef EGLBoolean (EGLAPIENTRYP PFNEGLQUERYWAYLANDBUFFERWL) (EGLDisplay dpy, 
struct wl_buffer *buffer, EGLint attribute, EGLint *value);
+typedef EGLBoolean (EGLAPIENTRYP PFNEGLQUERYWAYLANDBUFFERWL) (EGLDisplay dpy, 
struct wl_resource *buffer, EGLint attribute, EGLint *value);

  #endif

diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 1bce314..44fd8a8 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -41,6 +41,10 @@

  #include "egl_dri2.h"

+#ifdef HAVE_WAYLAND_PLATFORM
+#include "wayland-drm.h"
+#endif
+
  const __DRIuseInvalidateExtension use_invalidate = {
     { __DRI_USE_INVALIDATE, 1 }
  };
@@ -1195,7 +1199,7 @@ dri2_create_image_wayland_wl_buffer(_EGLDisplay *disp, 
_EGLContext *ctx,
                                    EGLClientBuffer _buffer,
                                    const EGLint *attr_list)
  {
-   struct wl_drm_buffer *buffer = (struct wl_drm_buffer *) _buffer;
+   struct wl_drm_buffer *buffer;
     struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
     const struct wl_drm_components_descriptor *f;
     __DRIimage *dri_image;
@@ -1203,7 +1207,8 @@ dri2_create_image_wayland_wl_buffer(_EGLDisplay *disp, 
_EGLContext *ctx,
     EGLint err;
     int32_t plane;

-   if (!wayland_buffer_is_drm(&buffer->buffer))
+   buffer = wayland_drm_buffer_get((struct wl_resource *) _buffer);
+   if (!buffer)
         return NULL;

     err = _eglParseImageAttribList(&attrs, disp, attr_list);
@@ -1508,8 +1513,8 @@ dri2_wl_reference_buffer(void *user_data, uint32_t name, 
int fd,

     if (fd == -1)
        img = dri2_dpy->image->createImageFromNames(dri2_dpy->dri_screen,
-                                                  buffer->buffer.width,
-                                                  buffer->buffer.height,
+                                                  buffer->width,
+                                                  buffer->height,
                                                    buffer->format,
                                                    (int*)&name, 1,
                                                    buffer->stride,
@@ -1517,8 +1522,8 @@ dri2_wl_reference_buffer(void *user_data, uint32_t name, 
int fd,
                                                    NULL);
     else
        img = dri2_dpy->image->createImageFromFds(dri2_dpy->dri_screen,
-                                                buffer->buffer.width,
-                                                buffer->buffer.height,
+                                                buffer->width,
+                                                buffer->height,
                                                  buffer->format,
                                                  &fd, 1,
                                                  buffer->stride,
@@ -1607,13 +1612,14 @@ dri2_unbind_wayland_display_wl(_EGLDriver *drv, 
_EGLDisplay *disp,

  static EGLBoolean
  dri2_query_wayland_buffer_wl(_EGLDriver *drv, _EGLDisplay *disp,
-                             struct wl_buffer *_buffer,
+                             struct wl_resource *buffer_resource,
                               EGLint attribute, EGLint *value)
  {
-   struct wl_drm_buffer *buffer = (struct wl_drm_buffer *) _buffer;
+   struct wl_drm_buffer *buffer;
     const struct wl_drm_components_descriptor *format;

-   if (!wayland_buffer_is_drm(&buffer->buffer))
+   buffer = wayland_drm_buffer_get(buffer_resource);
+   if (!buffer)
        return EGL_FALSE;

     format = buffer->driver_format;
@@ -1622,10 +1628,10 @@ dri2_query_wayland_buffer_wl(_EGLDriver *drv, 
_EGLDisplay *disp,
        *value = format->components;
        return EGL_TRUE;
     case EGL_WIDTH:
-      *value = buffer->buffer.width;
+      *value = buffer->width;
        return EGL_TRUE;
     case EGL_HEIGHT:
-      *value = buffer->buffer.height;
+      *value = buffer->height;
        return EGL_TRUE;
     }

diff --git a/src/egl/drivers/dri2/egl_dri2.h b/src/egl/drivers/dri2/egl_dri2.h
index 6dfdf94..fba5f81 100644
--- a/src/egl/drivers/dri2/egl_dri2.h
+++ b/src/egl/drivers/dri2/egl_dri2.h
@@ -37,7 +37,6 @@

  #ifdef HAVE_WAYLAND_PLATFORM
  #include <wayland-client.h>
-#include "wayland-drm.h"
  #include "wayland-egl-priv.h"
  #endif

diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 4a9831b..a788295 100644
--- a/src/egl/main/eglapi.c
+++ b/src/egl/main/eglapi.c
@@ -1571,7 +1571,7 @@ eglUnbindWaylandDisplayWL(EGLDisplay dpy, struct 
wl_display *display)
  }

  EGLBoolean EGLAPIENTRY
-eglQueryWaylandBufferWL(EGLDisplay dpy,struct wl_buffer *buffer,
+eglQueryWaylandBufferWL(EGLDisplay dpy, struct wl_resource *buffer,
                          EGLint attribute, EGLint *value)
  {
     _EGLDisplay *disp = _eglLockDisplay(dpy);
diff --git a/src/egl/main/eglapi.h b/src/egl/main/eglapi.h
index ee382d0..4a4f976 100644
--- a/src/egl/main/eglapi.h
+++ b/src/egl/main/eglapi.h
@@ -123,7 +123,7 @@ typedef EGLBoolean (*ExportDRMImageMESA_t)(_EGLDriver *drv, 
_EGLDisplay *disp, _
  struct wl_display;
  typedef EGLBoolean (*BindWaylandDisplayWL_t)(_EGLDriver *drv, _EGLDisplay 
*disp, struct wl_display *display);
  typedef EGLBoolean (*UnbindWaylandDisplayWL_t)(_EGLDriver *drv, _EGLDisplay 
*disp, struct wl_display *display);
-typedef EGLBoolean (*QueryWaylandBufferWL_t)(_EGLDriver *drv, _EGLDisplay 
*displ, struct wl_buffer *buffer, EGLint attribute, EGLint *value);
+typedef EGLBoolean (*QueryWaylandBufferWL_t)(_EGLDriver *drv, _EGLDisplay 
*displ, struct wl_resource *buffer, EGLint attribute, EGLint *value);
  #endif

  typedef EGLBoolean (*PostSubBufferNV_t)(_EGLDriver *drv, _EGLDisplay *disp, 
_EGLSurface *surface, EGLint x, EGLint y, EGLint width, EGLint height);
diff --git a/src/egl/wayland/wayland-drm/wayland-drm.c 
b/src/egl/wayland/wayland-drm/wayland-drm.c
index 7e2073a..d317c5e 100644
--- a/src/egl/wayland/wayland-drm/wayland-drm.c
+++ b/src/egl/wayland/wayland-drm/wayland-drm.c
@@ -37,6 +37,8 @@
  #include "wayland-drm.h"
  #include "wayland-drm-server-protocol.h"

+#define MIN(x,y) (((x)<(y))?(x):(y))
+
  struct wl_drm {
        struct wl_display *display;

@@ -86,8 +88,8 @@ create_buffer(struct wl_client *client, struct wl_resource 
*resource,
        }

        buffer->drm = drm;
-       buffer->buffer.width = width;
-       buffer->buffer.height = height;
+       buffer->width = width;
+       buffer->height = height;
        buffer->format = format;
        buffer->offset[0] = offset0;
        buffer->stride[0] = stride0;
@@ -104,16 +106,17 @@ create_buffer(struct wl_client *client, struct 
wl_resource *resource,
                return;
        }

-       buffer->buffer.resource.object.id = id;
-       buffer->buffer.resource.object.interface = &wl_buffer_interface;
-       buffer->buffer.resource.object.implementation =
-               (void (**)(void)) &drm_buffer_interface;
-       buffer->buffer.resource.data = buffer;
-
-       buffer->buffer.resource.destroy = destroy_buffer;
-       buffer->buffer.resource.client = resource->client;
+       buffer->resource =
+               wl_resource_create(client, &wl_buffer_interface, 1, id);
+       if (!buffer->resource) {
+               wl_resource_post_no_memory(resource);
+               free(buffer);
+               return;
+       }

-       wl_client_add_resource(resource->client, &buffer->buffer.resource);
+       wl_resource_set_implementation(buffer->resource,
+                                      (void (**)(void)) &drm_buffer_interface,
+                                      buffer, destroy_buffer);
  }

  static void
@@ -208,8 +211,15 @@ bind_drm(struct wl_client *client, void *data, uint32_t 
version, uint32_t id)
        struct wl_resource *resource;
          uint32_t capabilities;

-       resource = wl_client_add_object(client, &wl_drm_interface,
-                                       &drm_interface, id, data);
+       resource = wl_resource_create(client, &wl_drm_interface,
+                                     MIN(version, 2), id);
+       if (!resource) {
+               wl_client_post_no_memory(client);
+               return;
+       }
+
+       wl_resource_set_implementation(resource, &drm_interface, data, NULL);
+
        wl_resource_post_event(resource, WL_DRM_DEVICE, drm->device_name);
        wl_resource_post_event(resource, WL_DRM_FORMAT,
                               WL_DRM_FORMAT_ARGB8888);
@@ -232,6 +242,19 @@ bind_drm(struct wl_client *client, void *data, uint32_t 
version, uint32_t id)
             wl_resource_post_event(resource, WL_DRM_CAPABILITIES, 
capabilities);
  }

+struct wl_drm_buffer *
+wayland_drm_buffer_get(struct wl_resource *resource)
+{
+       if (resource == NULL)
+               return NULL;
+
+       if (wl_resource_instance_of(resource, &wl_buffer_interface,
+                                   &drm_buffer_interface))
+               return wl_resource_get_user_data(resource);
+       else
+               return NULL;
+}
+
  struct wl_drm *
  wayland_drm_init(struct wl_display *display, char *device_name,
                   struct wayland_drm_callbacks *callbacks, void *user_data,
@@ -247,7 +270,7 @@ wayland_drm_init(struct wl_display *display, char 
*device_name,
        drm->user_data = user_data;
          drm->flags = flags;

-       wl_display_add_global(display, &wl_drm_interface, drm, bind_drm);
+       wl_global_create(display, &wl_drm_interface, 2, drm, bind_drm);

        return drm;
  }
@@ -262,25 +285,14 @@ wayland_drm_uninit(struct wl_drm *drm)
        free(drm);
  }

-int
-wayland_buffer_is_drm(struct wl_buffer *buffer)
-{
-       return buffer->resource.object.implementation ==
-               (void (**)(void)) &drm_buffer_interface;
-}
-
  uint32_t
-wayland_drm_buffer_get_format(struct wl_buffer *buffer_base)
+wayland_drm_buffer_get_format(struct wl_drm_buffer *buffer)
  {
-       struct wl_drm_buffer *buffer = (struct wl_drm_buffer *) buffer_base;
-
        return buffer->format;
  }

  void *
-wayland_drm_buffer_get_buffer(struct wl_buffer *buffer_base)
+wayland_drm_buffer_get_buffer(struct wl_drm_buffer *buffer)
  {
-       struct wl_drm_buffer *buffer = (struct wl_drm_buffer *) buffer_base;
-
        return buffer->driver_buffer;
  }
diff --git a/src/egl/wayland/wayland-drm/wayland-drm.h 
b/src/egl/wayland/wayland-drm/wayland-drm.h
index 335073a..ca04882 100644
--- a/src/egl/wayland/wayland-drm/wayland-drm.h
+++ b/src/egl/wayland/wayland-drm/wayland-drm.h
@@ -70,8 +70,9 @@ enum wl_drm_format {
  struct wl_drm;

  struct wl_drm_buffer {
-       struct wl_buffer buffer;
+       struct wl_resource *resource;
        struct wl_drm *drm;
+       int32_t width, height;
        uint32_t format;
          const void *driver_format;
          int32_t offset[3];
@@ -90,6 +91,9 @@ struct wayland_drm_callbacks {

  enum { WAYLAND_DRM_PRIME = 0x01 };

+struct wl_drm_buffer *
+wayland_drm_buffer_get(struct wl_resource *resource);
+
  struct wl_drm *
  wayland_drm_init(struct wl_display *display, char *device_name,
                 struct wayland_drm_callbacks *callbacks, void *user_data,
@@ -98,13 +102,10 @@ wayland_drm_init(struct wl_display *display, char 
*device_name,
  void
  wayland_drm_uninit(struct wl_drm *drm);

-int
-wayland_buffer_is_drm(struct wl_buffer *buffer);
-
  uint32_t
-wayland_drm_buffer_get_format(struct wl_buffer *buffer_base);
+wayland_drm_buffer_get_format(struct wl_drm_buffer *buffer);

  void *
-wayland_drm_buffer_get_buffer(struct wl_buffer *buffer);
+wayland_drm_buffer_get_buffer(struct wl_drm_buffer *buffer);

  #endif
diff --git a/src/gallium/state_trackers/egl/common/egl_g3d_api.c 
b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
index 2e5424e..3ee0d67 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d_api.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
@@ -874,7 +874,7 @@ egl_g3d_unbind_wayland_display_wl(_EGLDriver *drv, 
_EGLDisplay *dpy,

  static EGLBoolean
  egl_g3d_query_wayland_buffer_wl(_EGLDriver *drv, _EGLDisplay *dpy,
-                                struct wl_buffer *buffer,
+                                struct wl_resource *buffer,
                                  EGLint attribute, EGLint *value)
  {
     struct egl_g3d_display *gdpy = egl_g3d_display(dpy);
diff --git a/src/gallium/state_trackers/egl/common/egl_g3d_image.c 
b/src/gallium/state_trackers/egl/common/egl_g3d_image.c
index aa1980b..c459dc3 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d_image.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_image.c
@@ -183,7 +183,7 @@ egl_g3d_reference_drm_buffer(_EGLDisplay *dpy, EGLint name,
  #ifdef EGL_WL_bind_wayland_display

  static struct pipe_resource *
-egl_g3d_reference_wl_buffer(_EGLDisplay *dpy, struct wl_buffer *buffer,
+egl_g3d_reference_wl_buffer(_EGLDisplay *dpy, struct wl_resource *buffer,
                              _EGLImage *img, const EGLint *attribs)
  {
     struct egl_g3d_display *gdpy = egl_g3d_display(dpy);
@@ -253,7 +253,7 @@ egl_g3d_create_image(_EGLDriver *drv, _EGLDisplay *dpy, 
_EGLContext *ctx,
  #ifdef EGL_WL_bind_wayland_display
     case EGL_WAYLAND_BUFFER_WL:
        ptex = egl_g3d_reference_wl_buffer(dpy,
-            (struct wl_buffer *) buffer, &gimg->base, attribs);
+            (struct wl_resource *) buffer, &gimg->base, attribs);
        break;
  #endif
  #ifdef EGL_ANDROID_image_native_buffer
diff --git a/src/gallium/state_trackers/egl/common/native_wayland_bufmgr.h 
b/src/gallium/state_trackers/egl/common/native_wayland_bufmgr.h
index dd27828..eb324bf 100644
--- a/src/gallium/state_trackers/egl/common/native_wayland_bufmgr.h
+++ b/src/gallium/state_trackers/egl/common/native_wayland_bufmgr.h
@@ -27,7 +27,7 @@

  struct native_display;
  struct wl_display;
-struct wl_buffer;
+struct wl_resource;
  struct pipe_resource;

  struct native_display_wayland_bufmgr {
@@ -38,11 +38,11 @@ struct native_display_wayland_bufmgr {
                               struct wl_display *wl_dpy);

     struct pipe_resource *(*buffer_get_resource)(struct native_display *ndpy,
-                                                struct wl_buffer *buffer);
+                                                struct wl_resource *buffer);


     boolean (*query_buffer)(struct native_display *ndpy,
-                           struct wl_buffer *buffer,
+                           struct wl_resource *buffer,
                             int attribute, int *value);
  };

diff --git a/src/gallium/state_trackers/egl/common/native_wayland_drm_bufmgr.c 
b/src/gallium/state_trackers/egl/common/native_wayland_drm_bufmgr.c
index 1603a3a..9b69cb9 100644
--- a/src/gallium/state_trackers/egl/common/native_wayland_drm_bufmgr.c
+++ b/src/gallium/state_trackers/egl/common/native_wayland_drm_bufmgr.c
@@ -70,8 +70,8 @@ wayland_drm_bufmgr_reference_buffer(void *user_data, uint32_t 
name, int fd,
     templ.target = PIPE_TEXTURE_2D;
     templ.format = pf;
     templ.bind = PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW;
-   templ.width0 = buffer->buffer.width;
-   templ.height0 = buffer->buffer.height;
+   templ.width0 = buffer->width;
+   templ.height0 = buffer->height;
     templ.depth0 = 1;
     templ.array_size = 1;

@@ -137,22 +137,29 @@ wayland_drm_bufmgr_unbind_display(struct native_display 
*ndpy,

  static struct pipe_resource *
  wayland_drm_bufmgr_wl_buffer_get_resource(struct native_display *ndpy,
-                                          struct wl_buffer *buffer)
+                                          struct wl_resource *buffer_resource)
  {
+   struct wl_drm_buffer *buffer = wayland_drm_buffer_get(buffer_resource);
+
+   if (!buffer)
+      return NULL;
+
     return wayland_drm_buffer_get_buffer(buffer);
  }

  static EGLBoolean
  wayland_drm_bufmgr_query_buffer(struct native_display *ndpy,
-                                struct wl_buffer *_buffer,
+                                struct wl_resource *buffer_resource,
                                  EGLint attribute, EGLint *value)
  {
-   struct wl_drm_buffer *buffer = (struct wl_drm_buffer *) _buffer;
-   struct pipe_resource *resource = buffer->driver_buffer;
+   struct wl_drm_buffer *buffer = wayland_drm_buffer_get(buffer_resource);
+   struct pipe_resource *resource;

-   if (!wayland_buffer_is_drm(&buffer->buffer))
+   if (!buffer)
        return EGL_FALSE;

+   resource = buffer->driver_buffer;
+
     switch (attribute) {
     case EGL_TEXTURE_FORMAT:
        switch (resource->format) {
@@ -166,10 +173,10 @@ wayland_drm_bufmgr_query_buffer(struct native_display 
*ndpy,
           return EGL_FALSE;
        }
     case EGL_WIDTH:
-      *value = buffer->buffer.width;
+      *value = buffer->width;
        return EGL_TRUE;
     case EGL_HEIGHT:
-      *value = buffer->buffer.height;
+      *value = buffer->height;
        return EGL_TRUE;
     default:
        return EGL_FALSE;
diff --git a/src/gbm/backends/dri/gbm_dri.c b/src/gbm/backends/dri/gbm_dri.c
index a3a0530..f7da79c 100644
--- a/src/gbm/backends/dri/gbm_dri.c
+++ b/src/gbm/backends/dri/gbm_dri.c
@@ -374,9 +374,10 @@ gbm_dri_bo_import(struct gbm_device *gbm,
  #if HAVE_WAYLAND_PLATFORM
     case GBM_BO_IMPORT_WL_BUFFER:
     {
-      struct wl_drm_buffer *wb = (struct wl_drm_buffer *) buffer;
+      struct wl_drm_buffer *wb;

-      if (!wayland_buffer_is_drm(buffer))
+      wb = wayland_drm_buffer_get((struct wl_resource *) buffer);
+      if (!wb)
           return NULL;

        image = wb->driver_buffer;
--
1.8.1.2

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