From 2b69ae2d66e56db609017e9711a96de3edbc0c27 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Thu, 18 Jul 2019 21:09:48 +0300
Subject: [PATCH] Support setting default background.

GitOrigin-RevId: 756e41775f3ee60faaa36f0a244f7f43ff82ef1d
---
 td/generate/scheme/td_api.tl      | 4 +++-
 td/telegram/BackgroundManager.cpp | 6 ++++++
 td/telegram/cli.cpp               | 2 ++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index 917fcec8..da69259b 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -3668,7 +3668,9 @@ getBackgroundUrl name:string type:BackgroundType = HttpUrl;
 searchBackground name:string = Background;
 
 //@description Changes selected by the user background; adds background to the list of installed backgrounds
-//@background The input background to use, null for solid backgrounds @type Background type @for_dark_theme True, if the background is chosen for dark theme
+//@background The input background to use, null for solid backgrounds
+//@type Background type; null for default background. The method will return error 404 if type is null
+//@for_dark_theme True, if the background is chosen for dark theme
 setBackground background:InputBackground type:BackgroundType for_dark_theme:Bool = Background;
 
 //@description Removes background from the list of installed backgrounds @background_id The background indentifier
diff --git a/td/telegram/BackgroundManager.cpp b/td/telegram/BackgroundManager.cpp
index a0b2db6e..6cc6149e 100644
--- a/td/telegram/BackgroundManager.cpp
+++ b/td/telegram/BackgroundManager.cpp
@@ -498,6 +498,12 @@ BackgroundId BackgroundManager::add_solid_background(int32 color) {
 BackgroundId BackgroundManager::set_background(const td_api::InputBackground *input_background,
                                                const td_api::BackgroundType *background_type, bool for_dark_theme,
                                                Promise<Unit> &&promise) {
+  if (background_type == nullptr) {
+    set_background_id(BackgroundId(), BackgroundType(), for_dark_theme);
+    promise.set_value(Unit());
+    return BackgroundId();
+  }
+
   auto r_type = get_background_type(background_type);
   if (r_type.is_error()) {
     promise.set_error(r_type.move_as_error());
diff --git a/td/telegram/cli.cpp b/td/telegram/cli.cpp
index 7e4f9772..d6593912 100644
--- a/td/telegram/cli.cpp
+++ b/td/telegram/cli.cpp
@@ -1993,6 +1993,8 @@ class CliClient final : public Actor {
       send_get_background_url(td_api::make_object<td_api::backgroundTypeSolid>(0x1000000));
     } else if (op == "sbg") {
       send_request(td_api::make_object<td_api::searchBackground>(args));
+    } else if (op == "sbgd") {
+      send_request(td_api::make_object<td_api::setBackground>(nullptr, nullptr, as_bool(args)));
     } else if (op == "sbgw" || op == "sbgwd") {
       send_request(td_api::make_object<td_api::setBackground>(
           td_api::make_object<td_api::inputBackgroundLocal>(as_input_file(args)),