From 5fdb5853878be164988f0c910c79fbde4ba849a9 Mon Sep 17 00:00:00 2001
From: Erfan Abdi <erfangplus@gmail.com>
Date: Tue, 29 Jun 2021 07:14:44 +0430
Subject: [PATCH] =?UTF-8?q?anbox:=20hwc:=20Don=E2=80=99t=20create=20dummy?=
 =?UTF-8?q?=20surface=20for=20single=20window?=
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---
 hwcomposer/hwcomposer.cpp  | 18 +++++++++++++-----
 hwcomposer/wayland-hwc.cpp | 29 +++++++++++++++--------------
 hwcomposer/wayland-hwc.h   |  2 +-
 3 files changed, 29 insertions(+), 20 deletions(-)

diff --git a/hwcomposer/hwcomposer.cpp b/hwcomposer/hwcomposer.cpp
index 64ce09e..3193235 100644
--- a/hwcomposer/hwcomposer.cpp
+++ b/hwcomposer/hwcomposer.cpp
@@ -143,8 +143,15 @@ static struct buffer *get_wl_buffer(struct anbox_hwc_composer_device_1 *pdev, hw
     return pdev->display->buffer_map[layer->handle];
 }
 
-static struct wl_surface *get_surface(struct anbox_hwc_composer_device_1 *pdev, hwc_layer_1_t *layer, struct window *window)
+static struct wl_surface *get_surface(struct anbox_hwc_composer_device_1 *pdev, hwc_layer_1_t *layer, struct window *window, bool multi)
 {
+    if (!multi) {
+        pdev->display->layers[window->surface] = {
+            .x = layer->displayFrame.left,
+            .y = layer->displayFrame.top };
+        return window->surface;
+    }
+
     struct wl_surface *surface = NULL;
     struct wl_subsurface *subsurface = NULL;
     int left = layer->displayFrame.left;
@@ -442,7 +449,7 @@ static int hwc_set(struct hwc_composer_device_1* dev,size_t numDisplays,
         if (active_apps == "full" || !pdev->use_subsurface) {
             // Show everything in a single window
             if (pdev->windows.find("full") == pdev->windows.end()) {
-                pdev->windows["full"] = create_window(pdev->display);
+                pdev->windows["full"] = create_window(pdev->display, pdev->use_subsurface);
             }
             window = pdev->windows["full"];
         } else {
@@ -455,7 +462,7 @@ static int hwc_set(struct hwc_composer_device_1* dev,size_t numDisplays,
                 std::string app;
                 while (std::getline(issAA, app, ':')) {
                     if (app == AppID)
-                        pdev->windows[AppID] = create_window(pdev->display);
+                        pdev->windows[AppID] = create_window(pdev->display, pdev->use_subsurface);
                 }
             }
             if (pdev->windows.find(AppID) != pdev->windows.end())
@@ -516,7 +523,7 @@ static int hwc_set(struct hwc_composer_device_1* dev,size_t numDisplays,
         }
         buf->timeline_fd = pdev->timeline_fd;
 
-        struct wl_surface *surface = get_surface(pdev, fb_layer, window);
+        struct wl_surface *surface = get_surface(pdev, fb_layer, window, pdev->use_subsurface);
         if (!surface) {
             ALOGE("Failed to get surface");
             continue;
@@ -536,7 +543,8 @@ static int hwc_set(struct hwc_composer_device_1* dev,size_t numDisplays,
         }
 
         wl_surface_commit(surface);
-        wl_surface_commit(window->surface);
+        if (pdev->use_subsurface)
+            wl_surface_commit(window->surface);
 
         const int kAcquireWarningMS = 100;
         err = sync_wait(fb_layer->acquireFenceFd, kAcquireWarningMS);
diff --git a/hwcomposer/wayland-hwc.cpp b/hwcomposer/wayland-hwc.cpp
index 9bcd296..004b7fc 100644
--- a/hwcomposer/wayland-hwc.cpp
+++ b/hwcomposer/wayland-hwc.cpp
@@ -247,7 +247,7 @@ destroy_window(struct window *window)
 }
 
 struct window *
-create_window(struct display *display)
+create_window(struct display *display, bool with_dummy)
 {
     struct window *window = new struct window();
     if (!window)
@@ -282,20 +282,21 @@ create_window(struct display *display)
          * 
          * TODO: Drop this hack
          */
-        int fd = syscall(SYS_memfd_create, "buffer", 0);
-        ftruncate(fd, 4);
-        void *shm_data = mmap(NULL, 4, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
-        if (shm_data == MAP_FAILED) {
-            fprintf(stderr, "mmap failed: %m\n");
-            close(fd);
-            exit(1);
+        if (with_dummy) {
+            int fd = syscall(SYS_memfd_create, "buffer", 0);
+            ftruncate(fd, 4);
+            void *shm_data = mmap(NULL, 4, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+            if (shm_data == MAP_FAILED) {
+                fprintf(stderr, "mmap failed: %m\n");
+                close(fd);
+                exit(1);
+            }
+            struct wl_shm_pool *pool = wl_shm_create_pool(display->shm, fd, 4);
+            struct wl_buffer *buffer_shm = wl_shm_pool_create_buffer(pool, 0, 1, 1, 4, WL_SHM_FORMAT_ARGB8888);
+            wl_shm_pool_destroy(pool);
+            wl_surface_attach(window->surface, buffer_shm, 0, 0);
+            wl_surface_damage(window->surface, 0, 0, 1, 1);
         }
-        struct wl_shm_pool *pool = wl_shm_create_pool(display->shm, fd, 4);
-        struct wl_buffer *buffer_shm = wl_shm_pool_create_buffer(pool, 0, 1, 1, 4, WL_SHM_FORMAT_ARGB8888);
-        wl_shm_pool_destroy(pool);
-        wl_surface_attach(window->surface, buffer_shm, 0, 0);
-        wl_surface_damage(window->surface, 0, 0, 1, 1);
-
     } else {
         assert(0);
     }
diff --git a/hwcomposer/wayland-hwc.h b/hwcomposer/wayland-hwc.h
index dfeee36..b6e1ee2 100644
--- a/hwcomposer/wayland-hwc.h
+++ b/hwcomposer/wayland-hwc.h
@@ -157,4 +157,4 @@ destroy_display(struct display *display);
 void
 destroy_window(struct window *window);
 struct window *
-create_window(struct display *display);
+create_window(struct display *display, bool with_dummy);