From 78a4493bc8e60da7b97342660dd1ff6de844e951 Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Fri, 4 Nov 2016 19:58:04 +0100
Subject: [PATCH xserver 08/12] xwayland: update cursor on tablet tools in
 proximity

Each xwl_tablet_tool gets a xwl_cursor, as on wayland each of those
will get an independent cursor that can be set through
zwp_tablet_tool.set_cursor.

However, all tools (and the pointer) share conceptually the same VCP
on Xwayland, so have cursor changes trigger a xwl_cursor update on
every tool (and the pointer, again). Maybe Xwayland could keep track
of the most recent device and only update that cursor to get better
visual results, but this is simpler, and it's going to be odd
anyway...

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Ping Cheng <ping.cheng@wacom.com>
(cherry picked from commit f471b5b8eb451b442554517c7cb6f0aa90d218c4)
---
 hw/xwayland/xwayland-cursor.c | 56 +++++++++++++++++++++++++++++++++++++++++++
 hw/xwayland/xwayland-input.c  | 17 +++++++++++++
 hw/xwayland/xwayland.h        |  5 ++++
 3 files changed, 78 insertions(+)

diff --git a/hw/xwayland/xwayland-cursor.c b/hw/xwayland/xwayland-cursor.c
index fdae3ce85..c95f4e830 100644
--- a/hw/xwayland/xwayland-cursor.c
+++ b/hw/xwayland/xwayland-cursor.c
@@ -175,11 +175,62 @@ xwl_seat_set_cursor(struct xwl_seat *xwl_seat)
     wl_surface_commit(xwl_cursor->surface);
 }
 
+void
+xwl_tablet_tool_set_cursor(struct xwl_tablet_tool *xwl_tablet_tool)
+{
+    struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
+    struct xwl_cursor *xwl_cursor = &xwl_tablet_tool->cursor;
+    PixmapPtr pixmap;
+    CursorPtr cursor;
+    int stride;
+
+    if (!xwl_seat->x_cursor) {
+        zwp_tablet_tool_v2_set_cursor(xwl_tablet_tool->tool,
+                                      xwl_tablet_tool->proximity_in_serial,
+                                      NULL, 0, 0);
+        return;
+    }
+
+    if (xwl_cursor->frame_cb) {
+        xwl_cursor->needs_update = TRUE;
+        return;
+    }
+
+    cursor = xwl_seat->x_cursor;
+    pixmap = dixGetPrivate(&cursor->devPrivates, &xwl_cursor_private_key);
+    if (!pixmap)
+        return;
+
+    stride = cursor->bits->width * 4;
+    if (cursor->bits->argb)
+        memcpy(pixmap->devPrivate.ptr,
+               cursor->bits->argb, cursor->bits->height * stride);
+    else
+        expand_source_and_mask(cursor, pixmap->devPrivate.ptr);
+
+    zwp_tablet_tool_v2_set_cursor(xwl_tablet_tool->tool,
+                                  xwl_tablet_tool->proximity_in_serial,
+                                  xwl_cursor->surface,
+                                  xwl_seat->x_cursor->bits->xhot,
+                                  xwl_seat->x_cursor->bits->yhot);
+    wl_surface_attach(xwl_cursor->surface,
+                      xwl_shm_pixmap_get_wl_buffer(pixmap), 0, 0);
+    wl_surface_damage(xwl_cursor->surface, 0, 0,
+                      xwl_seat->x_cursor->bits->width,
+                      xwl_seat->x_cursor->bits->height);
+
+    xwl_cursor->frame_cb = wl_surface_frame(xwl_cursor->surface);
+    wl_callback_add_listener(xwl_cursor->frame_cb, &frame_listener, xwl_cursor);
+
+    wl_surface_commit(xwl_cursor->surface);
+}
+
 static void
 xwl_set_cursor(DeviceIntPtr device,
                ScreenPtr screen, CursorPtr cursor, int x, int y)
 {
     struct xwl_seat *xwl_seat;
+    struct xwl_tablet_tool *xwl_tablet_tool;
     Bool cursor_visibility_changed;
 
     xwl_seat = device->public.devicePrivate;
@@ -194,6 +245,11 @@ xwl_set_cursor(DeviceIntPtr device,
         xwl_seat_cursor_visibility_changed(xwl_seat);
 
     xwl_seat_set_cursor(xwl_seat);
+
+    xorg_list_for_each_entry(xwl_tablet_tool, &xwl_seat->tablet_tools, link) {
+        if (xwl_tablet_tool->proximity_in_serial != 0)
+            xwl_tablet_tool_set_cursor(xwl_tablet_tool);
+    }
 }
 
 static void
diff --git a/hw/xwayland/xwayland-input.c b/hw/xwayland/xwayland-input.c
index bb520e891..77cd42789 100644
--- a/hw/xwayland/xwayland-input.c
+++ b/hw/xwayland/xwayland-input.c
@@ -1405,6 +1405,7 @@ tablet_tool_receive_removed(void *data, struct zwp_tablet_tool_v2 *tool)
     struct xwl_tablet_tool *xwl_tablet_tool = data;
 
     xorg_list_del(&xwl_tablet_tool->link);
+    xwl_cursor_release(&xwl_tablet_tool->cursor);
     zwp_tablet_tool_v2_destroy(tool);
     free(xwl_tablet_tool);
 }
@@ -1428,7 +1429,10 @@ tablet_tool_proximity_in(void *data, struct zwp_tablet_tool_v2 *tool,
     if (wl_surface == NULL)
         return;
 
+    xwl_tablet_tool->proximity_in_serial = serial;
     xwl_seat->focus_window = wl_surface_get_user_data(wl_surface);
+
+    xwl_tablet_tool_set_cursor(xwl_tablet_tool);
 }
 
 static void
@@ -1437,6 +1441,7 @@ tablet_tool_proximity_out(void *data, struct zwp_tablet_tool_v2 *tool)
     struct xwl_tablet_tool *xwl_tablet_tool = data;
     struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
 
+    xwl_tablet_tool->proximity_in_serial = 0;
     xwl_seat->focus_window = NULL;
 
     xwl_tablet_tool->pressure = 0;
@@ -1717,10 +1722,20 @@ tablet_seat_handle_add_tablet(void *data, struct zwp_tablet_seat_v2 *tablet_seat
 }
 
 static void
+xwl_tablet_tool_update_cursor(struct xwl_cursor *xwl_cursor)
+{
+    struct xwl_tablet_tool *xwl_tablet_tool = wl_container_of(xwl_cursor,
+                                                              xwl_tablet_tool,
+                                                              cursor);
+    xwl_tablet_tool_set_cursor(xwl_tablet_tool);
+}
+
+static void
 tablet_seat_handle_add_tool(void *data, struct zwp_tablet_seat_v2 *tablet_seat,
                             struct zwp_tablet_tool_v2 *tool)
 {
     struct xwl_seat *xwl_seat = data;
+    struct xwl_screen *xwl_screen = xwl_seat->xwl_screen;
     struct xwl_tablet_tool *xwl_tablet_tool;
 
     xwl_tablet_tool = calloc(sizeof *xwl_tablet_tool, 1);
@@ -1731,6 +1746,8 @@ tablet_seat_handle_add_tool(void *data, struct zwp_tablet_seat_v2 *tablet_seat,
 
     xwl_tablet_tool->tool = tool;
     xwl_tablet_tool->seat = xwl_seat;
+    xwl_cursor_init(&xwl_tablet_tool->cursor, xwl_screen,
+                    xwl_tablet_tool_update_cursor);
 
     xorg_list_add(&xwl_tablet_tool->link, &xwl_seat->tablet_tools);
 
diff --git a/hw/xwayland/xwayland.h b/hw/xwayland/xwayland.h
index bfa5f47c7..02a218c43 100644
--- a/hw/xwayland/xwayland.h
+++ b/hw/xwayland/xwayland.h
@@ -44,6 +44,7 @@
 
 #include "relative-pointer-unstable-v1-client-protocol.h"
 #include "pointer-constraints-unstable-v1-client-protocol.h"
+#include "tablet-unstable-v2-client-protocol.h"
 
 struct xwl_screen {
     int width;
@@ -200,6 +201,7 @@ struct xwl_tablet_tool {
     struct xwl_seat *seat;
 
     DeviceIntPtr xdevice;
+    uint32_t proximity_in_serial;
     uint32_t x;
     uint32_t y;
     uint32_t pressure;
@@ -210,6 +212,8 @@ struct xwl_tablet_tool {
 
     uint32_t buttons_now,
              buttons_prev;
+
+    struct xwl_cursor cursor;
 };
 
 struct xwl_tablet_pad {
@@ -237,6 +241,7 @@ Bool xwl_screen_init_cursor(struct xwl_screen *xwl_screen);
 
 struct xwl_screen *xwl_screen_get(ScreenPtr screen);
 
+void xwl_tablet_tool_set_cursor(struct xwl_tablet_tool *tool);
 void xwl_seat_set_cursor(struct xwl_seat *xwl_seat);
 
 void xwl_seat_destroy(struct xwl_seat *xwl_seat);
-- 
2.13.5