From 6bd2c6789b244a03bccdb254502567691c42b944 Mon Sep 17 00:00:00 2001
From: Campbell Barton <campbell@blender.org>
Date: Thu, 30 Jun 2022 22:53:20 +1000
Subject: GHOST: get/set cursor position now uses client instead of screen
 coords

Use client (window) relative coordinates for cursor position access,
this only moves the conversion from window-manager into GHOST,
(no functional changes).

This is needed for fix a bug in GHOST/Wayland which doesn't support
accessing absolute cursor coordinates & the window is needed to properly
access the cursor coordinates.

As it happens every caller to GHOST_GetCursorPosition was already making
the values window-relative, so there is little benefit in attempting to
workaround the problem on the Wayland side.

If needed the screen-space versions of functions can be exposed again.
---
 source/blender/windowmanager/intern/wm_window.c | 32 +++++++++++++++----------
 1 file changed, 20 insertions(+), 12 deletions(-)

(limited to 'source/blender/windowmanager/intern/wm_window.c')

diff --git a/source/blender/windowmanager/intern/wm_window.c b/source/blender/windowmanager/intern/wm_window.c
index baf137e6665..36f91f8414a 100644
--- a/source/blender/windowmanager/intern/wm_window.c
+++ b/source/blender/windowmanager/intern/wm_window.c
@@ -920,25 +920,33 @@ int wm_window_fullscreen_toggle_exec(bContext *C, wmOperator *UNUSED(op))
 
 /* ************ events *************** */
 
-void wm_cursor_position_from_ghost(wmWindow *win, int *x, int *y)
+void wm_cursor_position_from_ghost_client_coords(wmWindow *win, int *x, int *y)
 {
   float fac = GHOST_GetNativePixelSize(win->ghostwin);
-
-  GHOST_ScreenToClient(win->ghostwin, *x, *y, x, y);
   *x *= fac;
 
   *y = (win->sizey - 1) - *y;
   *y *= fac;
 }
 
-void wm_cursor_position_to_ghost(wmWindow *win, int *x, int *y)
+void wm_cursor_position_to_ghost_client_coords(wmWindow *win, int *x, int *y)
 {
   float fac = GHOST_GetNativePixelSize(win->ghostwin);
 
   *x /= fac;
   *y /= fac;
   *y = win->sizey - *y - 1;
+}
+
+void wm_cursor_position_from_ghost_screen_coords(wmWindow *win, int *x, int *y)
+{
+  GHOST_ScreenToClient(win->ghostwin, *x, *y, x, y);
+  wm_cursor_position_from_ghost_client_coords(win, x, y);
+}
 
+void wm_cursor_position_to_ghost_screen_coords(wmWindow *win, int *x, int *y)
+{
+  wm_cursor_position_to_ghost_client_coords(win, x, y);
   GHOST_ClientToScreen(win->ghostwin, *x, *y, x, y);
 }
 
@@ -949,8 +957,8 @@ void wm_cursor_position_get(wmWindow *win, int *r_x, int *r_y)
     *r_y = win->eventstate->xy[1];
     return;
   }
-  GHOST_GetCursorPosition(g_system, r_x, r_y);
-  wm_cursor_position_from_ghost(win, r_x, r_y);
+  GHOST_GetCursorPosition(g_system, win->ghostwin, r_x, r_y);
+  wm_cursor_position_from_ghost_client_coords(win, r_x, r_y);
 }
 
 typedef enum {
@@ -1418,14 +1426,14 @@ static bool ghost_event_proc(GHOST_EventHandle evt, GHOST_TUserDataPtr C_void_pt
       case GHOST_kEventTrackpad: {
         GHOST_TEventTrackpadData *pd = data;
 
-        wm_cursor_position_from_ghost(win, &pd->x, &pd->y);
+        wm_cursor_position_from_ghost_screen_coords(win, &pd->x, &pd->y);
         wm_event_add_ghostevent(wm, win, type, data);
         break;
       }
       case GHOST_kEventCursorMove: {
         GHOST_TEventCursorData *cd = data;
 
-        wm_cursor_position_from_ghost(win, &cd->x, &cd->y);
+        wm_cursor_position_from_ghost_screen_coords(win, &cd->x, &cd->y);
         wm_event_add_ghostevent(wm, win, type, data);
         break;
       }
@@ -1866,7 +1874,7 @@ wmWindow *WM_window_find_under_cursor(wmWindow *win, const int mval[2], int r_mv
 {
   int tmp[2];
   copy_v2_v2_int(tmp, mval);
-  wm_cursor_position_to_ghost(win, &tmp[0], &tmp[1]);
+  wm_cursor_position_to_ghost_screen_coords(win, &tmp[0], &tmp[1]);
 
   GHOST_WindowHandle ghostwin = GHOST_GetWindowUnderCursor(g_system, tmp[0], tmp[1]);
 
@@ -1875,7 +1883,7 @@ wmWindow *WM_window_find_under_cursor(wmWindow *win, const int mval[2], int r_mv
   }
 
   wmWindow *win_other = GHOST_GetWindowUserData(ghostwin);
-  wm_cursor_position_from_ghost(win_other, &tmp[0], &tmp[1]);
+  wm_cursor_position_from_ghost_screen_coords(win_other, &tmp[0], &tmp[1]);
   copy_v2_v2_int(r_mval, tmp);
   return win_other;
 }
@@ -2015,8 +2023,8 @@ void WM_cursor_warp(wmWindow *win, int x, int y)
   if (win && win->ghostwin) {
     int oldx = x, oldy = y;
 
-    wm_cursor_position_to_ghost(win, &x, &y);
-    GHOST_SetCursorPosition(g_system, x, y);
+    wm_cursor_position_to_ghost_client_coords(win, &x, &y);
+    GHOST_SetCursorPosition(g_system, win->ghostwin, x, y);
 
     win->eventstate->prev_xy[0] = oldx;
     win->eventstate->prev_xy[1] = oldy;
-- 
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