egl-swap: provide damage rectangles to wl_surface

Previously, wlEglSendDamageEvent used the entire surface as damage to
the compositor but in the wrong coordinate system. wl_surface_damage()
requires coordinates for the surface which could be scaled while
wl_surface_damage_buffer() expects buffer coordinates which is what
surface->width and surface->height represent.

This ensures that the parameters to eglSwapBuffersWithDamage() are passed
along to the compositor as well. The coordinate system is flipped between
eglSwapBuffersWithDamage() and wl_surface_damage_buffer() which is handled
as well.

Signed-off-by: Christian Hergert <[email protected]>

Author: chergert

include/wayland-eglsurface.h

@@ -160,7 +160,9 @@ EGLBoolean wlEglQueryNativeResourceHook(EGLDisplay dpy,
                                         int *value);
 
 EGLBoolean wlEglSendDamageEvent(WlEglSurface *surface,
-                                struct wl_event_queue *queue);
+                                struct wl_event_queue *queue,
+                                EGLint *rects,
+                                EGLint n_rects);
 
 void wlEglCreateFrameSync(WlEglSurface *surface);
 EGLint wlEglWaitFrameSync(WlEglSurface *surface);

src/wayland-eglsurface.c

@@ -161,9 +161,13 @@ EGLint wlEglWaitFrameSync(WlEglSurface *surface)
 }
 
 EGLBoolean
-wlEglSendDamageEvent(WlEglSurface *surface, struct wl_event_queue *queue)
+wlEglSendDamageEvent(WlEglSurface *surface,
+                     struct wl_event_queue *queue,
+                     EGLint *rects,
+                     EGLint n_rects)
 {
     struct wl_display *wlDpy = surface->wlEglDpy->nativeDpy;
+    EGLint i;
 
     if (surface->ctx.wlStreamResource) {
         /* Attach same buffer to indicate new content for the surface is
@@ -191,8 +195,20 @@ wlEglSendDamageEvent(WlEglSurface *surface, struct wl_event_queue *queue)
                           surface->dy);
     }
 
-    wl_surface_damage(surface->wlSurface, 0, 0,
-                      surface->width, surface->height);
+    if (n_rects > 0 &&
+        (wl_proxy_get_version((struct wl_proxy *)surface->wlSurface) >=
+         WL_SURFACE_DAMAGE_BUFFER_SINCE_VERSION)) {
+        for (i = 0; i < n_rects; i++) {
+            wl_surface_damage_buffer(surface->wlSurface,
+                                     rects[i*4],
+                                     surface->height - rects[i*4+1],
+                                     rects[i*4+2],
+                                     rects[i*4+3]);
+        }
+    } else {
+        wl_surface_damage(surface->wlSurface, 0, 0, UINT32_MAX, UINT32_MAX);
+    }
+
     wl_surface_commit(surface->wlSurface);
     surface->ctx.isAttached = EGL_TRUE;
 
@@ -257,7 +273,7 @@ damage_thread(void *args)
                     data->egl.streamFlush(display->devDpy->eglDisplay,
                                           surface->ctx.eglStream);
                 }
-                ok = wlEglSendDamageEvent(surface, queue);
+                ok = wlEglSendDamageEvent(surface, queue, NULL, 0);
                 surface->ctx.framesProcessed++;
              }
 

src/wayland-eglswap.c

@@ -125,7 +125,7 @@ EGLBoolean wlEglSwapBuffersWithDamageHook(EGLDisplay eglDisplay, EGLSurface eglS
         if (surface->ctx.useDamageThread) {
             surface->ctx.framesProduced++;
         } else {
-            res = wlEglSendDamageEvent(surface, surface->wlEventQueue);
+            res = wlEglSendDamageEvent(surface, surface->wlEventQueue, rects, n_rects);
         }
     }
     wlEglCreateFrameSync(surface);
@@ -285,7 +285,7 @@ EGLBoolean wlEglPostPresentExport(WlEglSurface *surface) {
     if (surface->ctx.useDamageThread) {
         surface->ctx.framesProduced++;
     } else {
-        res = wlEglSendDamageEvent(surface, surface->wlEventQueue);
+        res = wlEglSendDamageEvent(surface, surface->wlEventQueue, NULL, 0);
     }
 
     wlEglCreateFrameSync(surface);