From 295d961ee2c20d19193b26c1b3f29dd9f11e4a85 Mon Sep 17 00:00:00 2001
From: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Date: Mon, 3 Jul 2023 14:48:51 +0300
Subject: [PATCH] winewayland.drv: Send surface damage region to the
 compositor.

Send the surface damage region to the compositor, to enable it
to optimize pixel data transfers.
---
 dlls/winewayland.drv/wayland_surface.c | 26 +++++++++++++++++++++++---
 dlls/winewayland.drv/waylanddrv.h      |  5 ++++-
 dlls/winewayland.drv/window_surface.c  |  5 +++--
 3 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/dlls/winewayland.drv/wayland_surface.c b/dlls/winewayland.drv/wayland_surface.c
index c770083b23f..fbc49191d9e 100644
--- a/dlls/winewayland.drv/wayland_surface.c
+++ b/dlls/winewayland.drv/wayland_surface.c
@@ -226,8 +226,11 @@ void wayland_surface_clear_role(struct wayland_surface *surface)
  * released by the compositor.
  */
 void wayland_surface_attach_shm(struct wayland_surface *surface,
-                                struct wayland_shm_buffer *shm_buffer)
+                                struct wayland_shm_buffer *shm_buffer,
+                                HRGN surface_damage_region)
 {
+    RGNDATA *surface_damage;
+
     TRACE("surface=%p shm_buffer=%p (%dx%d)\n",
           surface, shm_buffer, shm_buffer->width, shm_buffer->height);
 
@@ -235,8 +238,25 @@ void wayland_surface_attach_shm(struct wayland_surface *surface,
     wayland_shm_buffer_ref(shm_buffer);
 
     wl_surface_attach(surface->wl_surface, shm_buffer->wl_buffer, 0, 0);
-    wl_surface_damage_buffer(surface->wl_surface, 0, 0,
-                             shm_buffer->width, shm_buffer->height);
+
+    /* Add surface damage, i.e., which parts of the surface have changed since
+     * the last surface commit. Note that this is different from the buffer
+     * damage region. */
+    surface_damage = get_region_data(surface_damage_region);
+    if (surface_damage)
+    {
+        RECT *rgn_rect = (RECT *)surface_damage->Buffer;
+        RECT *rgn_rect_end = rgn_rect + surface_damage->rdh.nCount;
+
+        for (;rgn_rect < rgn_rect_end; rgn_rect++)
+        {
+            wl_surface_damage_buffer(surface->wl_surface,
+                                     rgn_rect->left, rgn_rect->top,
+                                     rgn_rect->right - rgn_rect->left,
+                                     rgn_rect->bottom - rgn_rect->top);
+        }
+        free(surface_damage);
+    }
 }
 
 /**********************************************************************
diff --git a/dlls/winewayland.drv/waylanddrv.h b/dlls/winewayland.drv/waylanddrv.h
index 909c8ef5b7b..0fd2a7a6c77 100644
--- a/dlls/winewayland.drv/waylanddrv.h
+++ b/dlls/winewayland.drv/waylanddrv.h
@@ -146,7 +146,8 @@ void wayland_surface_destroy(struct wayland_surface *surface) DECLSPEC_HIDDEN;
 void wayland_surface_make_toplevel(struct wayland_surface *surface) DECLSPEC_HIDDEN;
 void wayland_surface_clear_role(struct wayland_surface *surface) DECLSPEC_HIDDEN;
 void wayland_surface_attach_shm(struct wayland_surface *surface,
-                                struct wayland_shm_buffer *shm_buffer) DECLSPEC_HIDDEN;
+                                struct wayland_shm_buffer *shm_buffer,
+                                HRGN surface_damage_region) DECLSPEC_HIDDEN;
 
 /**********************************************************************
  *          Wayland SHM buffer
@@ -179,6 +180,8 @@ static inline BOOL intersect_rect(RECT *dst, const RECT *src1, const RECT *src2)
     return !IsRectEmpty(dst);
 }
 
+RGNDATA *get_region_data(HRGN region) DECLSPEC_HIDDEN;
+
 /**********************************************************************
  *          USER driver functions
  */
diff --git a/dlls/winewayland.drv/window_surface.c b/dlls/winewayland.drv/window_surface.c
index 015306bc5f6..baf2c12a922 100644
--- a/dlls/winewayland.drv/window_surface.c
+++ b/dlls/winewayland.drv/window_surface.c
@@ -271,7 +271,7 @@ static void wayland_window_surface_set_region(struct window_surface *window_surf
 /**********************************************************************
  *          get_region_data
  */
-static RGNDATA *get_region_data(HRGN region)
+RGNDATA *get_region_data(HRGN region)
 {
     RGNDATA *data;
     DWORD size;
@@ -446,7 +446,8 @@ static void wayland_window_surface_flush(struct window_surface *window_surface)
     pthread_mutex_lock(&wws->wayland_surface->mutex);
     if (wws->wayland_surface->current_serial)
     {
-        wayland_surface_attach_shm(wws->wayland_surface, shm_buffer);
+        wayland_surface_attach_shm(wws->wayland_surface, shm_buffer,
+                                   surface_damage_region);
         wl_surface_commit(wws->wayland_surface->wl_surface);
         flushed = TRUE;
     }
-- 
2.11.4.GIT