Preliminary support for toplevel capture.

Note: Capture is currently untested, as no compositor has support.
Based purely on the protocol specification. Toplevel listing was tested
on Sway & wlroots (latest dev + wlroots MR #4545)

main.c

@@ -9,6 +9,7 @@
 
 #include "ext-image-capture-source-v1.prot.h"
 #include "ext-image-copy-capture-v1.prot.h"
+#include "ext-foreign-toplevel-list-v1.prot.h"
 
 #include "rif.h"
 
@@ -34,6 +35,8 @@ struct wl_shm* wl_shm = NULL;
 struct wl_buffer* frame_buffer = NULL;
 struct ext_output_image_capture_source_manager_v1* output_source_manager = NULL;
 struct ext_image_copy_capture_manager_v1* capture_manager = NULL;
+struct ext_foreign_toplevel_list_v1* toplevel_list = NULL;
+struct ext_foreign_toplevel_image_capture_source_manager_v1* toplevel_source_manager = NULL;
 
 void* shm_data = NULL;
 
@@ -41,6 +44,7 @@ struct image_data img_data;
 
 uint8_t is_frame_ready = 0;
 uint8_t is_capture_ready = 0;
+uint8_t full_screenshot = 0;
 
 uint32_t buf_size;
 
@@ -62,6 +66,12 @@ void handle_global(
   if(strcmp(interface, ext_image_copy_capture_manager_v1_interface.name) == 0) {
     capture_manager = wl_registry_bind(registry, name, &ext_image_copy_capture_manager_v1_interface, version);
   }
+  if(strcmp(interface, ext_foreign_toplevel_list_v1_interface.name) == 0) {
+    toplevel_list = wl_registry_bind(registry, name, &ext_foreign_toplevel_list_v1_interface, version);
+  }
+  if(strcmp(interface, ext_foreign_toplevel_image_capture_source_manager_v1_interface.name) == 0) {
+    toplevel_source_manager = wl_registry_bind(registry, name, &ext_foreign_toplevel_image_capture_source_manager_v1_interface, version);
+  }
 }
 
 void handle_global_remove(
@@ -106,7 +116,7 @@ void dmabuf_format(void *data,
 
 }
 
-void done(void *data,
+void capture_done(void* data,
        struct ext_image_copy_capture_session_v1* ext_image_copy_capture_session_v1) {
   const int shm_fd = memfd_create("wl_shm data", 0);
   ASSERT(shm_fd != -1, "Failed to create memfd.");
@@ -141,7 +151,7 @@ const struct ext_image_copy_capture_session_v1_listener capture_listener = {
   .shm_format = shm_format,
   .dmabuf_device = dmabuf_device,
   .dmabuf_format = dmabuf_format,
-  .done = done,
+  .done = capture_done,
   .stopped = stopped
 };
 
@@ -194,8 +204,90 @@ const struct ext_image_copy_capture_frame_v1_listener frame_listener = {
   .failed = failed
 };
 
+struct handle_data {
+  struct ext_foreign_toplevel_handle_v1* handle;
+  const char* title;
+  const char* app_id;
+  const char* identifier;
+};
+
+struct handle_data*** handles;
+size_t handles_len = 0;
+
+void closed(void *data,
+         struct ext_foreign_toplevel_handle_v1 *ext_foreign_toplevel_handle_v1) {
+  // TODO handle properly
+}
+void title(void *data,
+        struct ext_foreign_toplevel_handle_v1 *ext_foreign_toplevel_handle_v1,
+        const char *title) {
+  struct handle_data* handle_data = (struct handle_data*)data;
+  size_t size = strlen(title)+1;
+  char* title_data = malloc(size);
+  memcpy(title_data, title, size);
+  handle_data->title = title_data;
+}
+void app_id(void *data,
+         struct ext_foreign_toplevel_handle_v1 *ext_foreign_toplevel_handle_v1,
+         const char *app_id) {
+  struct handle_data* handle_data = (struct handle_data*)data;
+  size_t size = strlen(app_id)+1;
+  char* app_id_data = malloc(size);
+  memcpy(app_id_data, app_id, size);
+  handle_data->app_id = app_id_data;
+}
+void identifier(void *data,
+       struct ext_foreign_toplevel_handle_v1 *ext_foreign_toplevel_handle_v1,
+       const char *identifier) {
+  struct handle_data* handle_data = (struct handle_data*)data;
+  size_t size = strlen(identifier)+1;
+  char* identifier_data = malloc(size);
+  memcpy(identifier_data, identifier, size);
+  handle_data->identifier = identifier_data;
+}
+void toplevel_done(void *data,
+       struct ext_foreign_toplevel_handle_v1 *ext_foreign_toplevel_handle_v1) {
+  struct handle_data* handle_data = (struct handle_data*)data;
+}
+
+struct ext_foreign_toplevel_handle_v1_listener handle_listener = {
+  .closed = closed,
+  .done = toplevel_done,
+  .title = title,
+  .app_id = app_id,
+  .identifier = identifier,
+};
+
+void toplevel(void* data,
+     struct ext_foreign_toplevel_list_v1* ext_foreign_toplevel_list_v1,
+     struct ext_foreign_toplevel_handle_v1* toplevel) {
+  handles_len++;
+  *handles = realloc(*handles, handles_len*sizeof(void*));
+
+  struct handle_data* handle_data = malloc(sizeof(struct handle_data));
+
+  handle_data->handle = toplevel;
+  handle_data->title = NULL;
+  handle_data->app_id = NULL;
+  handle_data->identifier = NULL;
+
+  (*handles)[handles_len-1] = handle_data;
+
+  ext_foreign_toplevel_handle_v1_add_listener(toplevel, &handle_listener, handle_data);
+}
+void finished(void* data,
+     struct ext_foreign_toplevel_list_v1* ext_foreign_toplevel_list_v1) {
+
+  // TODO handle exploding properly
+}
+
+const struct ext_foreign_toplevel_list_v1_listener toplevel_listener = {
+  .toplevel = toplevel,
+  .finished = finished
+};
+
 
-int main() {
+int main(int argc, char* argv[]) {
   struct wl_display* dpy = wl_display_connect(NULL);
   ASSERT(dpy != NULL, "Unable to connect to Wayland");
 
@@ -208,11 +300,59 @@ int main() {
   ASSERT(stream_output != NULL, "No outputs found!");
 
   ASSERT(output_source_manager != NULL, "ext-image-capture-source-v1.ext_output_image_capture_source_manager_v1 not supported.");
+
+  struct handle_data* toplevel_handle = NULL;
+  if(argc == 2) {
+    ASSERT(toplevel_list != NULL, "ext-foreign-toplevel-list-v1.ext_foreign_toplevel_list_v1 not supported.");
+
+    handles = malloc(sizeof(void*));
+    *handles = malloc(sizeof(void*));
+
+    handles_len = 0;
+
+    ext_foreign_toplevel_list_v1_add_listener(toplevel_list, &toplevel_listener, NULL);
+    
+    if(strcmp(argv[1], "?") == 0) {
+      wl_display_roundtrip(dpy);
+      for(int i = 0; i < handles_len; i++) {
+        struct handle_data* handle_data = (*handles)[i];
+        printf("title: %s, app_id: %s, identifier: %s\n", handle_data->title, handle_data->app_id, handle_data->identifier);
+      }
+      return 0;
+    } else {
+      wl_display_roundtrip(dpy);
+      for(int i = 0; i < handles_len; i++) {
+        if(strcmp((*handles)[i]->identifier, argv[1]) == 0) {
+          toplevel_handle = (*handles)[i];
+          printf("Found handle: ");
+          printf("title: %s, app_id: %s, identifier: %s\n", toplevel_handle->title, toplevel_handle->app_id, toplevel_handle->identifier);
+        }
+      }
+    }
+  } else if(argc == 1) {
+    full_screenshot = 1;
+    wl_display_roundtrip(dpy);
+  } else {
+    ASSERT(argc >= 1, "Invalid exec!");
+    printf("Usage: %s ?|<identifier>\n");
+    exit(-1);
+  }
+
   ASSERT(capture_manager != NULL, "ext-image-copy-capture-v1.ext_image_copy_capture_manager_v1 not supported.");
 
-  struct ext_image_capture_source_v1* capture_source = 
+  struct ext_image_capture_source_v1* capture_source;
+  if(full_screenshot) {
+    ASSERT(output_source_manager != NULL, "ext-image-capture-source-v1.ext_output_image_capture_source_manager_v1 not supported.");
+    capture_source =
       ext_output_image_capture_source_manager_v1_create_source(output_source_manager, stream_output);
     ASSERT(capture_source != NULL, "Failed creating a source for the default output!")
+  } else {
+    ASSERT(toplevel_handle != NULL, "Invalid toplevel handle!");
+    ASSERT(toplevel_source_manager != NULL, "ext-image-capture-source-v1.ext_foreign_toplevel_image_capture_source_manager_v1 not supported.");
+    capture_source =
+      ext_foreign_toplevel_image_capture_source_manager_v1_create_source(toplevel_source_manager, toplevel_handle->handle);
+    ASSERT(capture_source != NULL, "Failed creating a source for the toplevel!")
+  }
     
   struct ext_image_copy_capture_session_v1* capture_session =
     ext_image_copy_capture_manager_v1_create_session(capture_manager, capture_source, EXT_IMAGE_COPY_CAPTURE_MANAGER_V1_OPTIONS_PAINT_CURSORS);