ext/wpe/WPEThreadedView.cpp

   1 /* Copyright (C) <2018, 2019, 2020> Philippe Normand <philn@igalia.com>
   2  * Copyright (C) <2018> Žan Doberšek <zdobersek@igalia.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include "WPEThreadedView.h"
  25
  26 #include <gst/gl/gl.h>
  27 #include <gst/gl/egl/gsteglimage.h>
  28 #include <gst/gl/egl/gstgldisplay_egl.h>
  29 #include <wayland-server.h>
  30
  31 #include <cstdio>
  32 #include <mutex>
  33
  34 #if ENABLE_SHM_BUFFER_SUPPORT
  35 #include <wpe/unstable/fdo-shm.h>
  36 #endif
  37
  38 GST_DEBUG_CATEGORY_EXTERN (wpe_view_debug);
  39 #define GST_CAT_DEFAULT wpe_view_debug
  40
  41 #if defined(WPE_FDO_CHECK_VERSION) && WPE_FDO_CHECK_VERSION(1, 3, 0)
  42 #define USE_DEPRECATED_FDO_EGL_IMAGE 0
  43 #define WPE_GLIB_SOURCE_PRIORITY G_PRIORITY_DEFAULT
  44 #else
  45 #define USE_DEPRECATED_FDO_EGL_IMAGE 1
  46 #define WPE_GLIB_SOURCE_PRIORITY -70
  47 #endif
  48
  49 class GMutexHolder {
  50 public:
  51     GMutexHolder(GMutex& mutex)
  52         : m(mutex)
  53     {
  54         g_mutex_lock(&m);
  55     }
  56     ~GMutexHolder()
  57     {
  58         g_mutex_unlock(&m);
  59     }
  60
  61 private:
  62     GMutex& m;
  63 };
  64
  65 static WPEContextThread *s_view = NULL;
  66
  67 WPEContextThread& WPEContextThread::singleton()
  68 {
  69     static gsize initialized = 0;
  70
  71     if (g_once_init_enter (&initialized)) {
  72         s_view = new WPEContextThread;
  73
  74         g_once_init_leave (&initialized, 1);
  75     }
  76
  77     return *s_view;
  78 }
  79
  80 WPEContextThread::WPEContextThread()
  81 {
  82     g_mutex_init(&threading.mutex);
  83     g_cond_init(&threading.cond);
  84
  85     {
  86         GMutexHolder lock(threading.mutex);
  87         threading.thread = g_thread_new("WPEContextThread", s_viewThread, this);
  88         g_cond_wait(&threading.cond, &threading.mutex);
  89         GST_DEBUG("thread spawned");
  90     }
  91 }
  92
  93 WPEContextThread::~WPEContextThread()
  94 {
  95     if (threading.thread) {
  96         g_thread_unref(threading.thread);
  97         threading.thread = nullptr;
  98     }
  99
 100     g_mutex_clear(&threading.mutex);
 101     g_cond_clear(&threading.cond);
 102 }
 103
 104 template<typename Function>
 105 void WPEContextThread::dispatch(Function func)
 106 {
 107     struct Payload {
 108         Function& func;
 109     };
 110     struct Payload payload { func };
 111
 112     GSource* source = g_idle_source_new();
 113     g_source_set_callback(source, [](gpointer data) -> gboolean {
 114         auto& view = WPEContextThread::singleton();
 115         GMutexHolder lock(view.threading.mutex);
 116
 117         auto* payload = static_cast<struct Payload*>(data);
 118         payload->func();
 119
 120         g_cond_signal(&view.threading.cond);
 121         return G_SOURCE_REMOVE;
 122     }, &payload, nullptr);
 123     g_source_set_priority(source, WPE_GLIB_SOURCE_PRIORITY);
 124
 125     {
 126         GMutexHolder lock(threading.mutex);
 127         g_source_attach(source, glib.context);
 128         g_cond_wait(&threading.cond, &threading.mutex);
 129     }
 130
 131     g_source_unref(source);
 132 }
 133
 134 gpointer WPEContextThread::s_viewThread(gpointer data)
 135 {
 136     auto& view = *static_cast<WPEContextThread*>(data);
 137
 138     view.glib.context = g_main_context_new();
 139     view.glib.loop = g_main_loop_new(view.glib.context, FALSE);
 140
 141     g_main_context_push_thread_default(view.glib.context);
 142
 143     {
 144         GSource* source = g_idle_source_new();
 145         g_source_set_callback(source,
 146             [](gpointer data) -> gboolean {
 147                 auto& view = *static_cast<WPEContextThread*>(data);
 148                 GMutexHolder lock(view.threading.mutex);
 149                 g_cond_signal(&view.threading.cond);
 150                 return G_SOURCE_REMOVE;
 151             },
 152             &view, nullptr);
 153         g_source_attach(source, view.glib.context);
 154         g_source_unref(source);
 155     }
 156
 157     g_main_loop_run(view.glib.loop);
 158
 159     g_main_loop_unref(view.glib.loop);
 160     view.glib.loop = nullptr;
 161
 162     g_main_context_pop_thread_default(view.glib.context);
 163     g_main_context_unref(view.glib.context);
 164     view.glib.context = nullptr;
 165     return nullptr;
 166 }
 167
 168 WPEView* WPEContextThread::createWPEView(GstWpeVideoSrc* src, GstGLContext* context, GstGLDisplay* display, int width, int height)
 169 {
 170     GST_DEBUG("context %p display %p, size (%d,%d)", context, display, width, height);
 171
 172     static std::once_flag s_loaderFlag;
 173     std::call_once(s_loaderFlag,
 174         [] {
 175 #if defined(WPE_BACKEND_CHECK_VERSION) && WPE_BACKEND_CHECK_VERSION(1, 2, 0)
 176             wpe_loader_init("libWPEBackend-fdo-1.0.so");
 177 #endif
 178         });
 179
 180     WPEView* view = nullptr;
 181     dispatch([&]() mutable {
 182         if (!glib.web_context) {
 183             auto* manager = webkit_website_data_manager_new_ephemeral();
 184             glib.web_context = webkit_web_context_new_with_website_data_manager(manager);
 185             g_object_unref(manager);
 186         }
 187
 188         view = new WPEView(glib.web_context, src, context, display, width, height);
 189     });
 190
 191     if (view && view->hasUri()) {
 192         GST_DEBUG("waiting load to finish");
 193         view->waitLoadCompletion();
 194         GST_DEBUG("done");
 195     }
 196
 197     return view;
 198 }
 199
 200 static gboolean s_loadFailed(WebKitWebView*, WebKitLoadEvent, gchar* failing_uri, GError* error, gpointer data)
 201 {
 202     GstWpeVideoSrc* src = GST_WPE_VIDEO_SRC(data);
 203
 204     if (g_error_matches(error, WEBKIT_NETWORK_ERROR, WEBKIT_NETWORK_ERROR_CANCELLED)) {
 205         GST_INFO_OBJECT (src, "Loading cancelled.");
 206
 207         return FALSE;
 208     }
 209
 210     GST_ELEMENT_ERROR (GST_ELEMENT_CAST(src), RESOURCE, FAILED, (NULL), ("Failed to load %s (%s)", failing_uri, error->message));
 211     return FALSE;
 212 }
 213
 214 static gboolean s_loadFailedWithTLSErrors(WebKitWebView*,  gchar* failing_uri, GTlsCertificate*, GTlsCertificateFlags, gpointer data)
 215 {
 216     // Defer to load-failed.
 217     return FALSE;
 218 }
 219
 220 static void s_loadProgressChaned(GObject* object, GParamSpec*, gpointer data)
 221 {
 222     GstElement* src = GST_ELEMENT_CAST (data);
 223     // The src element is locked already so we can't call
 224     // gst_element_post_message(). Instead retrieve the bus manually and use it
 225     // directly.
 226     GstBus* bus = GST_ELEMENT_BUS (src);
 227     double estimatedProgress;
 228     g_object_get(object, "estimated-load-progress", &estimatedProgress, nullptr);
 229     gst_object_ref (bus);
 230     gst_bus_post (bus, gst_message_new_element(GST_OBJECT_CAST(src), gst_structure_new("wpe-stats", "estimated-load-progress", G_TYPE_DOUBLE, estimatedProgress * 100, nullptr)));
 231     gst_object_unref (bus);
 232 }
 233
 234 WPEView::WPEView(WebKitWebContext* web_context, GstWpeVideoSrc* src, GstGLContext* context, GstGLDisplay* display, int width, int height)
 235 {
 236     g_mutex_init(&threading.ready_mutex);
 237     g_cond_init(&threading.ready_cond);
 238     threading.ready = FALSE;
 239
 240     g_mutex_init(&images_mutex);
 241     if (context)
 242         gst.context = GST_GL_CONTEXT(gst_object_ref(context));
 243     if (display) {
 244         gst.display = GST_GL_DISPLAY(gst_object_ref(display));
 245     }
 246
 247     wpe.width = width;
 248     wpe.height = height;
 249
 250     if (context && display) {
 251       if (gst_gl_context_get_gl_platform(context) == GST_GL_PLATFORM_EGL) {
 252         gst.display_egl = gst_gl_display_egl_from_gl_display (gst.display);
 253       } else {
 254         GST_DEBUG ("Available GStreamer GL Context is not EGL - not creating an EGL display from it");
 255       }
 256     }
 257
 258     if (gst.display_egl) {
 259         EGLDisplay eglDisplay = (EGLDisplay)gst_gl_display_get_handle (GST_GL_DISPLAY(gst.display_egl));
 260         GST_DEBUG("eglDisplay %p", eglDisplay);
 261
 262         m_isValid = wpe_fdo_initialize_for_egl_display(eglDisplay);
 263         GST_DEBUG("FDO EGL display initialisation result: %d", m_isValid);
 264     } else {
 265 #if ENABLE_SHM_BUFFER_SUPPORT
 266         m_isValid = wpe_fdo_initialize_shm();
 267         GST_DEBUG("FDO SHM initialisation result: %d", m_isValid);
 268 #else
 269         GST_WARNING("FDO SHM support is available only in WPEBackend-FDO 1.7.0");
 270 #endif
 271     }
 272     if (!m_isValid)
 273         return;
 274
 275     if (gst.display_egl) {
 276         wpe.exportable = wpe_view_backend_exportable_fdo_egl_create(&s_exportableEGLClient, this, wpe.width, wpe.height);
 277     } else {
 278 #if ENABLE_SHM_BUFFER_SUPPORT
 279         wpe.exportable = wpe_view_backend_exportable_fdo_create(&s_exportableClient, this, wpe.width, wpe.height);
 280 #endif
 281     }
 282
 283     auto* wpeViewBackend = wpe_view_backend_exportable_fdo_get_view_backend(wpe.exportable);
 284     auto* viewBackend = webkit_web_view_backend_new(wpeViewBackend, (GDestroyNotify) wpe_view_backend_exportable_fdo_destroy, wpe.exportable);
 285 #if defined(WPE_BACKEND_CHECK_VERSION) && WPE_BACKEND_CHECK_VERSION(1, 1, 0)
 286     wpe_view_backend_add_activity_state(wpeViewBackend, wpe_view_activity_state_visible | wpe_view_activity_state_focused | wpe_view_activity_state_in_window);
 287 #endif
 288
 289     webkit.view = WEBKIT_WEB_VIEW(g_object_new(WEBKIT_TYPE_WEB_VIEW, "web-context", web_context, "backend", viewBackend, nullptr));
 290
 291     g_signal_connect(webkit.view, "load-failed", G_CALLBACK(s_loadFailed), src);
 292     g_signal_connect(webkit.view, "load-failed-with-tls-errors", G_CALLBACK(s_loadFailedWithTLSErrors), src);
 293     g_signal_connect(webkit.view, "notify::estimated-load-progress", G_CALLBACK(s_loadProgressChaned), src);
 294
 295     gst_wpe_video_src_configure_web_view(src, webkit.view);
 296
 297     gchar* location;
 298     gboolean drawBackground = TRUE;
 299     g_object_get(src, "location", &location, "draw-background", &drawBackground, nullptr);
 300     setDrawBackground(drawBackground);
 301     if (location) {
 302         loadUriUnlocked(location);
 303         g_free(location);
 304     }
 305 }
 306
 307 WPEView::~WPEView()
 308 {
 309     GstEGLImage *egl_pending = NULL;
 310     GstEGLImage *egl_committed = NULL;
 311     GstBuffer *shm_pending = NULL;
 312     GstBuffer *shm_committed = NULL;
 313     GST_TRACE ("%p destroying", this);
 314
 315     g_mutex_clear(&threading.ready_mutex);
 316     g_cond_clear(&threading.ready_cond);
 317
 318     {
 319         GMutexHolder lock(images_mutex);
 320
 321         if (egl.pending) {
 322             egl_pending = egl.pending;
 323             egl.pending = nullptr;
 324         }
 325         if (egl.committed) {
 326             egl_committed = egl.committed;
 327             egl.committed = nullptr;
 328         }
 329         if (shm.pending) {
 330             GST_TRACE ("%p freeing shm pending %" GST_PTR_FORMAT, this, shm.pending);
 331             shm_pending = shm.pending;
 332             shm.pending = nullptr;
 333         }
 334         if (shm.committed) {
 335             GST_TRACE ("%p freeing shm commited %" GST_PTR_FORMAT, this, shm.committed);
 336             shm_committed = shm.committed;
 337             shm.committed = nullptr;
 338         }
 339     }
 340
 341     if (egl_pending)
 342         gst_egl_image_unref (egl_pending);
 343     if (egl_committed)
 344         gst_egl_image_unref (egl_committed);
 345     if (shm_pending)
 346         gst_buffer_unref (shm_pending);
 347     if (shm_committed)
 348         gst_buffer_unref (shm_committed);
 349
 350     WPEContextThread::singleton().dispatch([&]() {
 351         if (webkit.view) {
 352             g_object_unref(webkit.view);
 353             webkit.view = nullptr;
 354         }
 355     });
 356
 357     if (gst.display_egl) {
 358         gst_object_unref(gst.display_egl);
 359         gst.display_egl = nullptr;
 360     }
 361
 362     if (gst.display) {
 363         gst_object_unref(gst.display);
 364         gst.display = nullptr;
 365     }
 366
 367     if (gst.context) {
 368         gst_object_unref(gst.context);
 369         gst.context = nullptr;
 370     }
 371     if (webkit.uri) {
 372         g_free(webkit.uri);
 373         webkit.uri = nullptr;
 374     }
 375
 376     g_mutex_clear(&images_mutex);
 377     GST_TRACE ("%p destroyed", this);
 378 }
 379
 380 void WPEView::notifyLoadFinished()
 381 {
 382     GMutexHolder lock(threading.ready_mutex);
 383     if (!threading.ready) {
 384         threading.ready = TRUE;
 385         g_cond_signal(&threading.ready_cond);
 386     }
 387 }
 388
 389 void WPEView::waitLoadCompletion()
 390 {
 391     GMutexHolder lock(threading.ready_mutex);
 392     while (!threading.ready)
 393         g_cond_wait(&threading.ready_cond, &threading.ready_mutex);
 394 }
 395
 396 GstEGLImage* WPEView::image()
 397 {
 398     GstEGLImage* ret = nullptr;
 399     bool dispatchFrameComplete = false;
 400     GstEGLImage *prev_image = NULL;
 401
 402     {
 403         GMutexHolder lock(images_mutex);
 404
 405         GST_TRACE("pending %" GST_PTR_FORMAT " (%d) committed %" GST_PTR_FORMAT " (%d)", egl.pending,
 406                   GST_IS_EGL_IMAGE(egl.pending) ? GST_MINI_OBJECT_REFCOUNT_VALUE(GST_MINI_OBJECT_CAST(egl.pending)) : 0,
 407                   egl.committed,
 408                   GST_IS_EGL_IMAGE(egl.committed) ? GST_MINI_OBJECT_REFCOUNT_VALUE(GST_MINI_OBJECT_CAST(egl.committed)) : 0);
 409
 410         if (egl.pending) {
 411             prev_image = egl.committed;
 412             egl.committed = egl.pending;
 413             egl.pending = nullptr;
 414
 415             dispatchFrameComplete = true;
 416         }
 417
 418         if (egl.committed)
 419             ret = egl.committed;
 420     }
 421
 422     if (prev_image)
 423         gst_egl_image_unref(prev_image);
 424
 425     if (dispatchFrameComplete)
 426         frameComplete();
 427
 428     return ret;
 429 }
 430
 431 GstBuffer* WPEView::buffer()
 432 {
 433     GstBuffer* ret = nullptr;
 434     bool dispatchFrameComplete = false;
 435     GstBuffer *prev_image = NULL;
 436
 437     {
 438         GMutexHolder lock(images_mutex);
 439
 440         GST_TRACE("pending %" GST_PTR_FORMAT " (%d) committed %" GST_PTR_FORMAT " (%d)", shm.pending,
 441                   GST_IS_BUFFER(shm.pending) ? GST_MINI_OBJECT_REFCOUNT_VALUE(GST_MINI_OBJECT_CAST(shm.pending)) : 0,
 442                   shm.committed,
 443                   GST_IS_BUFFER(shm.committed) ? GST_MINI_OBJECT_REFCOUNT_VALUE(GST_MINI_OBJECT_CAST(shm.committed)) : 0);
 444
 445         if (shm.pending) {
 446             prev_image = shm.committed;
 447             shm.committed = shm.pending;
 448             shm.pending = nullptr;
 449
 450             dispatchFrameComplete = true;
 451         }
 452
 453         if (shm.committed)
 454             ret = shm.committed;
 455     }
 456
 457     if (prev_image)
 458         gst_buffer_unref(prev_image);
 459
 460     if (dispatchFrameComplete)
 461         frameComplete();
 462
 463     return ret;
 464 }
 465
 466 void WPEView::resize(int width, int height)
 467 {
 468     GST_DEBUG("resize to %dx%d", width, height);
 469     wpe.width = width;
 470     wpe.height = height;
 471
 472     s_view->dispatch([&]() {
 473         if (wpe.exportable && wpe_view_backend_exportable_fdo_get_view_backend(wpe.exportable))
 474           wpe_view_backend_dispatch_set_size(wpe_view_backend_exportable_fdo_get_view_backend(wpe.exportable), wpe.width, wpe.height);
 475     });
 476 }
 477
 478 void WPEView::frameComplete()
 479 {
 480     GST_TRACE("frame complete");
 481     s_view->dispatch([&]() {
 482         GST_TRACE("dispatching");
 483         wpe_view_backend_exportable_fdo_dispatch_frame_complete(wpe.exportable);
 484     });
 485 }
 486
 487 void WPEView::loadUriUnlocked(const gchar* uri)
 488 {
 489     if (webkit.uri)
 490         g_free(webkit.uri);
 491
 492     GST_DEBUG("loading %s", uri);
 493     webkit.uri = g_strdup(uri);
 494     webkit_web_view_load_uri(webkit.view, webkit.uri);
 495 }
 496
 497 void WPEView::loadUri(const gchar* uri)
 498 {
 499     s_view->dispatch([&]() {
 500         loadUriUnlocked(uri);
 501     });
 502 }
 503
 504 void WPEView::loadData(GBytes* bytes)
 505 {
 506     s_view->dispatch([this, bytes = g_bytes_ref(bytes)]() {
 507         webkit_web_view_load_bytes(webkit.view, bytes, nullptr, nullptr, nullptr);
 508         g_bytes_unref(bytes);
 509     });
 510 }
 511
 512 void WPEView::setDrawBackground(gboolean drawsBackground)
 513 {
 514     GST_DEBUG("%s background rendering", drawsBackground ? "Enabling" : "Disabling");
 515     WebKitColor color;
 516     webkit_color_parse(&color, drawsBackground ? "white" : "transparent");
 517     webkit_web_view_set_background_color(webkit.view, &color);
 518 }
 519
 520 void WPEView::releaseImage(gpointer imagePointer)
 521 {
 522     s_view->dispatch([&]() {
 523         GST_TRACE("Dispatch release exported image %p", imagePointer);
 524 #if USE_DEPRECATED_FDO_EGL_IMAGE
 525         wpe_view_backend_exportable_fdo_egl_dispatch_release_image(wpe.exportable,
 526                                                                    static_cast<EGLImageKHR>(imagePointer));
 527 #else
 528         wpe_view_backend_exportable_fdo_egl_dispatch_release_exported_image(wpe.exportable,
 529                                                                             static_cast<struct wpe_fdo_egl_exported_image*>(imagePointer));
 530 #endif
 531     });
 532 }
 533
 534 struct ImageContext {
 535     WPEView* view;
 536     gpointer image;
 537 };
 538
 539 void WPEView::handleExportedImage(gpointer image)
 540 {
 541     ImageContext* imageContext = g_slice_new(ImageContext);
 542     imageContext->view = this;
 543     imageContext->image = static_cast<gpointer>(image);
 544     EGLImageKHR eglImage;
 545 #if USE_DEPRECATED_FDO_EGL_IMAGE
 546     eglImage = static_cast<EGLImageKHR>(image);
 547 #else
 548     eglImage = wpe_fdo_egl_exported_image_get_egl_image(static_cast<struct wpe_fdo_egl_exported_image*>(image));
 549 #endif
 550
 551     auto* gstImage = gst_egl_image_new_wrapped(gst.context, eglImage, GST_GL_RGBA, imageContext, s_releaseImage);
 552     {
 553       GMutexHolder lock(images_mutex);
 554
 555       GST_TRACE("EGLImage %p wrapped in GstEGLImage %" GST_PTR_FORMAT, eglImage, gstImage);
 556       gst_clear_mini_object ((GstMiniObject **) &egl.pending);
 557       egl.pending = gstImage;
 558
 559       notifyLoadFinished();
 560     }
 561 }
 562
 563 #if ENABLE_SHM_BUFFER_SUPPORT
 564 struct SHMBufferContext {
 565     WPEView* view;
 566     struct wpe_fdo_shm_exported_buffer* buffer;
 567 };
 568
 569 void WPEView::releaseSHMBuffer(gpointer data)
 570 {
 571     SHMBufferContext* context = static_cast<SHMBufferContext*>(data);
 572     s_view->dispatch([&]() {
 573         auto* buffer = static_cast<struct wpe_fdo_shm_exported_buffer*>(context->buffer);
 574         GST_TRACE("Dispatch release exported buffer %p", buffer);
 575         wpe_view_backend_exportable_fdo_dispatch_release_shm_exported_buffer(wpe.exportable, buffer);
 576     });
 577 }
 578
 579 void WPEView::s_releaseSHMBuffer(gpointer data)
 580 {
 581     SHMBufferContext* context = static_cast<SHMBufferContext*>(data);
 582     context->view->releaseSHMBuffer(data);
 583     g_slice_free(SHMBufferContext, context);
 584 }
 585
 586 void WPEView::handleExportedBuffer(struct wpe_fdo_shm_exported_buffer* buffer)
 587 {
 588     struct wl_shm_buffer* shmBuffer = wpe_fdo_shm_exported_buffer_get_shm_buffer(buffer);
 589     auto format = wl_shm_buffer_get_format(shmBuffer);
 590     if (format != WL_SHM_FORMAT_ARGB8888 && format != WL_SHM_FORMAT_XRGB8888) {
 591         GST_ERROR("Unsupported pixel format: %d", format);
 592         return;
 593     }
 594
 595     int32_t width = wl_shm_buffer_get_width(shmBuffer);
 596     int32_t height = wl_shm_buffer_get_height(shmBuffer);
 597     gint stride = wl_shm_buffer_get_stride(shmBuffer);
 598     gsize size = width * height * 4;
 599     auto* data = static_cast<uint8_t*>(wl_shm_buffer_get_data(shmBuffer));
 600
 601     SHMBufferContext* bufferContext = g_slice_new(SHMBufferContext);
 602     bufferContext->view = this;
 603     bufferContext->buffer = buffer;
 604
 605     auto* gstBuffer = gst_buffer_new_wrapped_full(GST_MEMORY_FLAG_READONLY, data, size, 0, size, bufferContext, s_releaseSHMBuffer);
 606     gsize offsets[1];
 607     gint strides[1];
 608     offsets[0] = 0;
 609     strides[0] = stride;
 610     gst_buffer_add_video_meta_full(gstBuffer, GST_VIDEO_FRAME_FLAG_NONE, GST_VIDEO_FORMAT_BGRA, width, height, 1, offsets, strides);
 611
 612     {
 613         GMutexHolder lock(images_mutex);
 614         GST_TRACE("SHM buffer %p wrapped in buffer %" GST_PTR_FORMAT, buffer, gstBuffer);
 615         gst_clear_buffer (&shm.pending);
 616         shm.pending = gstBuffer;
 617         notifyLoadFinished();
 618     }
 619 }
 620 #endif
 621
 622 struct wpe_view_backend_exportable_fdo_egl_client WPEView::s_exportableEGLClient = {
 623 #if USE_DEPRECATED_FDO_EGL_IMAGE
 624     // export_egl_image
 625     [](void* data, EGLImageKHR image) {
 626         auto& view = *static_cast<WPEView*>(data);
 627         view.handleExportedImage(static_cast<gpointer>(image));
 628     },
 629     nullptr, nullptr,
 630 #else
 631     // export_egl_image
 632     nullptr,
 633     [](void* data, struct wpe_fdo_egl_exported_image* image) {
 634         auto& view = *static_cast<WPEView*>(data);
 635         view.handleExportedImage(static_cast<gpointer>(image));
 636     },
 637     nullptr,
 638 #endif // USE_DEPRECATED_FDO_EGL_IMAGE
 639     // padding
 640     nullptr, nullptr
 641 };
 642
 643 #if ENABLE_SHM_BUFFER_SUPPORT
 644 struct wpe_view_backend_exportable_fdo_client WPEView::s_exportableClient = {
 645     nullptr,
 646     nullptr,
 647     // export_shm_buffer
 648     [](void* data, struct wpe_fdo_shm_exported_buffer* buffer) {
 649         auto& view = *static_cast<WPEView*>(data);
 650         view.handleExportedBuffer(buffer);
 651     },
 652     nullptr,
 653     nullptr,
 654 };
 655 #endif
 656
 657 void WPEView::s_releaseImage(GstEGLImage* image, gpointer data)
 658 {
 659     ImageContext* context = static_cast<ImageContext*>(data);
 660     context->view->releaseImage(context->image);
 661     g_slice_free(ImageContext, context);
 662 }
 663
 664 struct wpe_view_backend* WPEView::backend() const
 665 {
 666     return wpe.exportable ? wpe_view_backend_exportable_fdo_get_view_backend(wpe.exportable) : nullptr;
 667 }
 668
 669 void WPEView::dispatchKeyboardEvent(struct wpe_input_keyboard_event& wpe_event)
 670 {
 671     s_view->dispatch([&]() {
 672         wpe_view_backend_dispatch_keyboard_event(backend(), &wpe_event);
 673     });
 674 }
 675
 676 void WPEView::dispatchPointerEvent(struct wpe_input_pointer_event& wpe_event)
 677 {
 678     s_view->dispatch([&]() {
 679         wpe_view_backend_dispatch_pointer_event(backend(), &wpe_event);
 680     });
 681 }
 682
 683 void WPEView::dispatchAxisEvent(struct wpe_input_axis_event& wpe_event)
 684 {
 685     s_view->dispatch([&]() {
 686         wpe_view_backend_dispatch_axis_event(backend(), &wpe_event);
 687     });
 688 }