Merge pull request #380 from emersion/xwayland-root-cursor

Set xwayland root cursor

.build.yml

@@ -6,6 +6,7 @@ packages:
   - mesa
   - libinput
   - libxkbcommon
+  - xcb-util-image
   - libcap
   - pixman
   - clang

.travis.yml

@@ -16,6 +16,7 @@ arch:
     - libinput
     - pixman
     - libxkbcommon
+    - xcb-util-image
     - libcap
   script:
     - "meson build"

include/wlr/xwayland.h

@@ -12,6 +12,7 @@
 #endif
 
 struct wlr_xwm;
+struct wlr_xwayland_cursor;
 
 struct wlr_xwayland {
 	pid_t pid;
@@ -25,6 +26,7 @@ struct wlr_xwayland {
 	struct wl_event_source *sigusr1_source;
 	struct wl_listener destroy_listener;
 	struct wlr_xwm *xwm;
+	struct wlr_xwayland_cursor *cursor;
 
 	struct {
 		struct wl_signal new_surface;
@@ -148,6 +150,10 @@ struct wlr_xwayland *wlr_xwayland_create(struct wl_display *wl_display,
 
 void wlr_xwayland_destroy(struct wlr_xwayland *wlr_xwayland);
 
+void wlr_xwayland_set_cursor(struct wlr_xwayland *wlr_xwayland,
+	uint8_t *pixels, uint32_t stride, uint32_t width, uint32_t height,
+	int32_t hotspot_x, int32_t hotspot_y);
+
 void wlr_xwayland_surface_activate(struct wlr_xwayland *wlr_xwayland,
 	struct wlr_xwayland_surface *surface, bool activated);
 

meson.build

@@ -52,6 +52,8 @@ pixman         = dependency('pixman-1')
 xcb            = dependency('xcb')
 xcb_composite  = dependency('xcb-composite')
 xcb_xfixes     = dependency('xcb-xfixes')
+xcb_image      = dependency('xcb-image')
+xcb_render     = dependency('xcb-render')
 xcb_icccm      = dependency('xcb-icccm', required: false)
 x11_xcb        = dependency('x11-xcb')
 libcap         = dependency('libcap', required: false)

rootston/input.c

@@ -4,6 +4,7 @@
 #include <wlr/types/wlr_cursor.h>
 #include <wlr/util/log.h>
 #include <wlr/xcursor.h>
+#include <wlr/xwayland.h>
 #include "rootston/server.h"
 #include "rootston/config.h"
 #include "rootston/input.h"
@@ -96,6 +97,14 @@ struct roots_input *input_create(struct roots_server *server,
 		return NULL;
 	}
 
+	if (server->desktop->xwayland != NULL) {
+		struct wlr_xcursor_image *xcursor_image = xcursor->images[0];
+		wlr_xwayland_set_cursor(server->desktop->xwayland,
+			xcursor_image->buffer, xcursor_image->width, xcursor_image->width,
+			xcursor_image->height, xcursor_image->hotspot_x,
+			xcursor_image->hotspot_y);
+	}
+
 	input->wl_seat = wlr_seat_create(server->wl_display, "seat0");
 	if (input->wl_seat == NULL) {
 		wlr_log(L_ERROR, "Cannot create seat");

xwayland/meson.build

@@ -11,6 +11,8 @@ lib_wlr_xwayland = static_library(
 		xcb,
 		xcb_composite,
 		xcb_xfixes,
+		xcb_image,
+		xcb_render,
 		xcb_icccm,
 		pixman,
 	],

xwayland/xwayland.c

@@ -29,6 +29,15 @@ static inline int clearenv(void) {
 }
 #endif
 
+struct wlr_xwayland_cursor {
+	uint8_t *pixels;
+	uint32_t stride;
+	uint32_t width;
+	uint32_t height;
+	int32_t hotspot_x;
+	int32_t hotspot_y;
+};
+
 static void safe_close(int fd) {
 	if (fd >= 0) {
 		close(fd);
@@ -190,6 +199,14 @@ static int xserver_handle_ready(int signal_number, void *data) {
 	wl_event_source_remove(wlr_xwayland->sigusr1_source);
 	wlr_xwayland->sigusr1_source = NULL;
 
+	if (wlr_xwayland->cursor != NULL) {
+		struct wlr_xwayland_cursor *cur = wlr_xwayland->cursor;
+		xwm_set_cursor(wlr_xwayland->xwm, cur->pixels, cur->stride, cur->width,
+			cur->height, cur->hotspot_x, cur->hotspot_y);
+		free(cur);
+		wlr_xwayland->cursor = NULL;
+	}
+
 	char display_name[16];
 	snprintf(display_name, sizeof(display_name), ":%d", wlr_xwayland->display);
 	setenv("DISPLAY", display_name, true);
@@ -298,3 +315,26 @@ struct wlr_xwayland *wlr_xwayland_create(struct wl_display *wl_display,
 	free(wlr_xwayland);
 	return NULL;
 }
+
+void wlr_xwayland_set_cursor(struct wlr_xwayland *wlr_xwayland,
+		uint8_t *pixels, uint32_t stride, uint32_t width, uint32_t height,
+		int32_t hotspot_x, int32_t hotspot_y) {
+	if (wlr_xwayland->xwm != NULL) {
+		xwm_set_cursor(wlr_xwayland->xwm, pixels, stride, width, height,
+			hotspot_x, hotspot_y);
+		return;
+	}
+
+	free(wlr_xwayland->cursor);
+
+	wlr_xwayland->cursor = calloc(1, sizeof(struct wlr_xwayland_cursor));
+	if (wlr_xwayland->cursor == NULL) {
+		return;
+	}
+	wlr_xwayland->cursor->pixels = pixels;
+	wlr_xwayland->cursor->stride = stride;
+	wlr_xwayland->cursor->width = width;
+	wlr_xwayland->cursor->height = height;
+	wlr_xwayland->cursor->hotspot_x = hotspot_x;
+	wlr_xwayland->cursor->hotspot_y = hotspot_y;
+}

xwayland/xwm.c

@@ -5,9 +5,12 @@
 #include <unistd.h>
 #include <xcb/composite.h>
 #include <xcb/xfixes.h>
+#include <xcb/xcb_image.h>
+#include <xcb/render.h>
 #include "wlr/util/log.h"
 #include "wlr/types/wlr_surface.h"
 #include "wlr/xwayland.h"
+#include "wlr/xcursor.h"
 #include "xwm.h"
 
 #ifdef HAS_XCB_ICCCM
@@ -1035,6 +1038,9 @@ void xwm_destroy(struct wlr_xwm *xwm) {
 	if (!xwm) {
 		return;
 	}
+	if (xwm->cursor) {
+		xcb_free_cursor(xwm->xcb_conn, xwm->cursor);
+	}
 	if (xwm->event_source) {
 		wl_event_source_remove(xwm->event_source);
 	}
@@ -1097,7 +1103,6 @@ static void xwm_get_resources(struct wlr_xwm *xwm) {
 		xfixes_reply->major_version, xfixes_reply->minor_version);
 
 	free(xfixes_reply);
-
 }
 
 static void xwm_create_wm_window(struct wlr_xwm *xwm) {
@@ -1170,7 +1175,7 @@ static void xwm_get_visual_and_colormap(struct wlr_xwm *xwm) {
 	}
 
 	if (visualtype == NULL) {
-		wlr_log(L_DEBUG, "no 32 bit visualtype\n");
+		wlr_log(L_DEBUG, "No 32 bit visualtype\n");
 		return;
 	}
 
@@ -1183,6 +1188,71 @@ static void xwm_get_visual_and_colormap(struct wlr_xwm *xwm) {
 		xwm->visual_id);
 }
 
+static void xwm_get_render_format(struct wlr_xwm *xwm) {
+	xcb_render_query_pict_formats_cookie_t cookie =
+		xcb_render_query_pict_formats(xwm->xcb_conn);
+	xcb_render_query_pict_formats_reply_t *reply =
+		xcb_render_query_pict_formats_reply(xwm->xcb_conn, cookie, NULL);
+	xcb_render_pictforminfo_iterator_t iter =
+		xcb_render_query_pict_formats_formats_iterator(reply);
+	xcb_render_pictforminfo_t *format = NULL;
+	while (iter.rem > 0) {
+		if (iter.data->depth == 32) {
+			format = iter.data;
+			break;
+		}
+
+		xcb_render_pictforminfo_next(&iter);
+	}
+
+	if (format == NULL) {
+		wlr_log(L_DEBUG, "No 32 bit render format");
+		return;
+	}
+
+	xwm->render_format_id = format->id;
+}
+
+void xwm_set_cursor(struct wlr_xwm *xwm, const uint8_t *pixels, uint32_t stride,
+		uint32_t width, uint32_t height, int32_t hotspot_x, int32_t hotspot_y) {
+	if (!xwm->render_format_id) {
+		wlr_log(L_ERROR, "Cannot set xwm cursor: no render format available");
+		return;
+	}
+	if (xwm->cursor) {
+		xcb_free_cursor(xwm->xcb_conn, xwm->cursor);
+	}
+
+	stride *= 4;
+	int depth = 32;
+
+	xcb_pixmap_t pix = xcb_generate_id(xwm->xcb_conn);
+	xcb_create_pixmap(xwm->xcb_conn, depth, pix, xwm->screen->root, width,
+		height);
+
+	xcb_render_picture_t pic = xcb_generate_id(xwm->xcb_conn);
+	xcb_render_create_picture(xwm->xcb_conn, pic, pix, xwm->render_format_id,
+		0, 0);
+
+	xcb_gcontext_t gc = xcb_generate_id(xwm->xcb_conn);
+	xcb_create_gc(xwm->xcb_conn, gc, pix, 0, NULL);
+
+	xcb_put_image(xwm->xcb_conn, XCB_IMAGE_FORMAT_Z_PIXMAP, pix, gc,
+		width, height, 0, 0, 0, depth, stride * height * sizeof(uint8_t),
+		pixels);
+	xcb_free_gc(xwm->xcb_conn, gc);
+
+	xwm->cursor = xcb_generate_id(xwm->xcb_conn);
+	xcb_render_create_cursor(xwm->xcb_conn, xwm->cursor, pic, hotspot_x,
+		hotspot_y);
+	xcb_free_pixmap(xwm->xcb_conn, pix);
+
+	uint32_t values[] = {xwm->cursor};
+	xcb_change_window_attributes(xwm->xcb_conn, xwm->screen->root,
+		XCB_CW_CURSOR, values);
+	xcb_flush(xwm->xcb_conn);
+}
+
 struct wlr_xwm *xwm_create(struct wlr_xwayland *wlr_xwayland) {
 	struct wlr_xwm *xwm = calloc(1, sizeof(struct wlr_xwm));
 	if (xwm == NULL) {
@@ -1219,16 +1289,16 @@ struct wlr_xwm *xwm_create(struct wlr_xwayland *wlr_xwayland) {
 
 	xwm_get_resources(xwm);
 	xwm_get_visual_and_colormap(xwm);
+	xwm_get_render_format(xwm);
 
-	uint32_t values[1];
-	values[0] =
+	uint32_t values[] = {
 		XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY |
 			XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
-		XCB_EVENT_MASK_PROPERTY_CHANGE;
-
+			XCB_EVENT_MASK_PROPERTY_CHANGE,
+	};
 	xcb_change_window_attributes(xwm->xcb_conn,
 		xwm->screen->root,
-		XCB_CW_EVENT_MASK /* | XCB_CW_CURSOR */,
+		XCB_CW_EVENT_MASK,
 		values);
 
 	xcb_composite_redirect_subwindows(xwm->xcb_conn,

xwayland/xwm.h

@@ -1,5 +1,7 @@
 #ifndef XWAYLAND_INTERNALS_H
 #define XWAYLAND_INTERNALS_H
+
+#include <xcb/render.h>
 #include <wayland-server-core.h>
 #include <wlr/xwayland.h>
 
@@ -49,6 +51,8 @@ struct wlr_xwm {
 	xcb_window_t window;
 	xcb_visualid_t visual_id;
 	xcb_colormap_t colormap;
+	xcb_render_pictformat_t render_format_id;
+	xcb_cursor_t cursor;
 
 	struct wlr_xwayland_surface *focus_surface;
 
@@ -60,8 +64,11 @@ struct wlr_xwm {
 	struct wl_listener compositor_surface_create;
 };
 
-void xwm_destroy(struct wlr_xwm *xwm);
-
 struct wlr_xwm *xwm_create(struct wlr_xwayland *wlr_xwayland);
 
+void xwm_destroy(struct wlr_xwm *xwm);
+
+void xwm_set_cursor(struct wlr_xwm *xwm, const uint8_t *pixels, uint32_t stride,
+	uint32_t width, uint32_t height, int32_t hotspot_x, int32_t hotspot_y);
+
 #endif