ext-image-capture-source-v1: add base interface

include/wlr/interfaces/wlr_ext_image_capture_source_v1.h

@@ -0,0 +1,30 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_INTERFACES_WLR_EXT_IMAGE_CAPTURE_SOURCE_V1_H
+#define WLR_INTERFACES_WLR_EXT_IMAGE_CAPTURE_SOURCE_V1_H
+
+#include <wayland-server-core.h>
+#include <wlr/types/wlr_ext_image_capture_source_v1.h>
+
+struct wlr_ext_image_copy_capture_frame_v1;
+
+struct wlr_ext_image_capture_source_v1_interface {
+	void (*schedule_frame)(struct wlr_ext_image_capture_source_v1 *source);
+	void (*copy_frame)(struct wlr_ext_image_capture_source_v1 *source,
+		struct wlr_ext_image_copy_capture_frame_v1 *dst_frame,
+		struct wlr_ext_image_capture_source_v1_frame_event *frame_event);
+};
+
+void wlr_ext_image_capture_source_v1_init(struct wlr_ext_image_capture_source_v1 *source,
+		const struct wlr_ext_image_capture_source_v1_interface *impl);
+void wlr_ext_image_capture_source_v1_finish(struct wlr_ext_image_capture_source_v1 *source);
+bool wlr_ext_image_capture_source_v1_create_resource(struct wlr_ext_image_capture_source_v1 *source,
+	struct wl_client *client, uint32_t new_id);
+
+#endif

include/wlr/types/wlr_ext_image_capture_source_v1.h

@@ -0,0 +1,60 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_TYPES_WLR_EXT_IMAGE_CAPTURE_SOURCE_V1_H
+#define WLR_TYPES_WLR_EXT_IMAGE_CAPTURE_SOURCE_V1_H
+
+#include <pixman.h>
+#include <wayland-server-core.h>
+#include <wlr/render/drm_format_set.h>
+
+/**
+ * A screen capture source.
+ *
+ * When the size, device or formats change, the constraints_update event is
+ * emitted.
+ *
+ * The device and formats advertised are suitable for copying into a
+ * struct wlr_buffer.
+ */
+struct wlr_ext_image_capture_source_v1 {
+	const struct wlr_ext_image_capture_source_v1_interface *impl;
+	struct wl_list resources; // wl_resource_get_link()
+
+	uint32_t width, height;
+
+	uint32_t *shm_formats;
+	size_t shm_formats_len;
+
+	dev_t dmabuf_device;
+	struct wlr_drm_format_set dmabuf_formats;
+
+	struct {
+		struct wl_signal constraints_update;
+		struct wl_signal frame; // struct wlr_ext_image_capture_source_v1_frame_event
+		struct wl_signal destroy;
+	} events;
+};
+
+/**
+ * Event indicating that the source has produced a new frame.
+ */
+struct wlr_ext_image_capture_source_v1_frame_event {
+	const pixman_region32_t *damage;
+};
+
+/**
+ * Obtain a struct wlr_ext_image_capture_source_v1 from an ext_image_capture_source_v1
+ * resource.
+ *
+ * Asserts that the resource has the correct type. Returns NULL if the resource
+ * is inert.
+ */
+struct wlr_ext_image_capture_source_v1 *wlr_ext_image_capture_source_v1_from_resource(struct wl_resource *resource);
+
+#endif

protocol/meson.build

@@ -29,6 +29,7 @@ protocols = {
 	'drm-lease-v1': wl_protocol_dir / 'staging/drm-lease/drm-lease-v1.xml',
 	'ext-foreign-toplevel-list-v1': wl_protocol_dir / 'staging/ext-foreign-toplevel-list/ext-foreign-toplevel-list-v1.xml',
 	'ext-idle-notify-v1': wl_protocol_dir / 'staging/ext-idle-notify/ext-idle-notify-v1.xml',
+	'ext-image-capture-source-v1': wl_protocol_dir / 'staging/ext-image-capture-source/ext-image-capture-source-v1.xml',
 	'ext-session-lock-v1': wl_protocol_dir / 'staging/ext-session-lock/ext-session-lock-v1.xml',
 	'fractional-scale-v1': wl_protocol_dir / 'staging/fractional-scale/fractional-scale-v1.xml',
 	'linux-drm-syncobj-v1': wl_protocol_dir / 'staging/linux-drm-syncobj/linux-drm-syncobj-v1.xml',

types/ext_image_capture_source_v1/base.c

@@ -0,0 +1,71 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <wlr/interfaces/wlr_ext_image_capture_source_v1.h>
+#include <wlr/types/wlr_ext_image_capture_source_v1.h>
+#include "ext-image-capture-source-v1-protocol.h"
+
+static void source_handle_destroy(struct wl_client *client,
+		struct wl_resource *source_resource) {
+	wl_resource_destroy(source_resource);
+}
+
+static const struct ext_image_capture_source_v1_interface source_impl = {
+	.destroy = source_handle_destroy,
+};
+
+struct wlr_ext_image_capture_source_v1 *wlr_ext_image_capture_source_v1_from_resource(struct wl_resource *resource) {
+	assert(wl_resource_instance_of(resource,
+		&ext_image_capture_source_v1_interface, &source_impl));
+	return wl_resource_get_user_data(resource);
+}
+
+static void source_handle_resource_destroy(struct wl_resource *resource) {
+	wl_list_remove(wl_resource_get_link(resource));
+}
+
+void wlr_ext_image_capture_source_v1_init(struct wlr_ext_image_capture_source_v1 *source,
+		const struct wlr_ext_image_capture_source_v1_interface *impl) {
+	*source = (struct wlr_ext_image_capture_source_v1){
+		.impl = impl,
+	};
+	wl_list_init(&source->resources);
+	wl_signal_init(&source->events.destroy);
+	wl_signal_init(&source->events.constraints_update);
+	wl_signal_init(&source->events.frame);
+}
+
+void wlr_ext_image_capture_source_v1_finish(struct wlr_ext_image_capture_source_v1 *source) {
+	wl_signal_emit_mutable(&source->events.destroy, NULL);
+
+	assert(wl_list_empty(&source->events.destroy.listener_list));
+	assert(wl_list_empty(&source->events.constraints_update.listener_list));
+	assert(wl_list_empty(&source->events.frame.listener_list));
+
+	struct wl_resource *resource, *resource_tmp;
+	wl_resource_for_each_safe(resource, resource_tmp, &source->resources) {
+		wl_resource_set_user_data(resource, NULL);
+		wl_list_remove(wl_resource_get_link(resource));
+		wl_list_init(wl_resource_get_link(resource));
+	}
+
+	free(source->shm_formats);
+	wlr_drm_format_set_finish(&source->dmabuf_formats);
+}
+
+bool wlr_ext_image_capture_source_v1_create_resource(struct wlr_ext_image_capture_source_v1 *source,
+		struct wl_client *client, uint32_t new_id) {
+	struct wl_resource *resource = wl_resource_create(client,
+		&ext_image_capture_source_v1_interface, 1, new_id);
+	if (resource == NULL) {
+		wl_client_post_no_memory(client);
+		return false;
+	}
+	wl_resource_set_implementation(resource, &source_impl, source,
+		source_handle_resource_destroy);
+	if (source != NULL) {
+		wl_list_insert(&source->resources, wl_resource_get_link(resource));
+	} else {
+		wl_list_init(wl_resource_get_link(resource));
+	}
+	return true;
+}

types/meson.build

@@ -3,6 +3,7 @@ wlr_files += files(
 	'data_device/wlr_data_offer.c',
 	'data_device/wlr_data_source.c',
 	'data_device/wlr_drag.c',
+	'ext_image_capture_source_v1/base.c',
 	'output/cursor.c',
 	'output/output.c',
 	'output/render.c',