CLuaInstance: Add script function saveScreen()/restoreScreen()

Example:
 local memID = n:saveScreen(x, y, w, h);
 ...
 ...
 n:restoreScreen(x, y, w, h, memID, delete);
 -- delete = true => delete screen buffer
 -- delete = false => don't delete screen buffer

 - Set Lua api version to 1.14


Origin commit data
------------------
Branch: ni/coolstream
Commit: 550cfc853d
Author: Michael Liebmann <tuxcode.bbg@gmail.com>
Date: 2015-11-27 (Fri, 27 Nov 2015)

Origin message was:
------------------
CLuaInstance: Add script function saveScreen()/restoreScreen()

 Example:
  local memID = n:saveScreen(x, y, w, h);
   ...
   ...
  n:restoreScreen(x, y, w, h, memID, delete);
   -- delete = true => delete screen buffer
   -- delete = false => don't delete screen buffer

 - Set Lua api version to 1.14


------------------
This commit was generated by Migit

src/gui/luainstance.cpp

@@ -558,6 +558,9 @@ const luaL_Reg CLuaInstance::methods[] =
 {
 	{ "GetRevision", CLuaInstance::GetRevision },
 	{ "PaintBox", CLuaInstance::PaintBox },
+	{ "saveScreen", CLuaInstance::saveScreen },
+	{ "restoreScreen", CLuaInstance::restoreScreen },
+	{ "deleteSavedScreen", CLuaInstance::deleteSavedScreen },
 	{ "RenderString", CLuaInstance::RenderString },
 	{ "PaintIcon", CLuaInstance::PaintIcon },
 	{ "GetInput", CLuaInstance::GetInput },
@@ -662,6 +665,74 @@ int CLuaInstance::NewWindow(lua_State *L)
 	return 1;
 }
 
+int CLuaInstance::saveScreen(lua_State *L)
+{
+	int x, y, w, h;
+	fb_pixel_t* buf;
+	CLuaData *W = CheckData(L, 1);
+	if (!W || !W->fbwin)
+		return 0;
+	x = luaL_checkint(L, 2);
+	y = luaL_checkint(L, 3);
+	w = luaL_checkint(L, 4);
+	h = luaL_checkint(L, 5);
+
+	buf = W->fbwin->saveScreen(x, y, w, h);
+
+	lua_Integer id = W->screenmap.size() + 1;
+	W->screenmap.insert(screenmap_pair_t(id, buf));
+	lua_pushinteger(L, id);
+	return 1;
+}
+
+int CLuaInstance::restoreScreen(lua_State *L)
+{
+	int x, y, w, h, id;
+	fb_pixel_t* buf = NULL;
+	bool del;
+	CLuaData *W = CheckData(L, 1);
+	if (!W || !W->fbwin)
+		return 0;
+	x = luaL_checkint(L, 2);
+	y = luaL_checkint(L, 3);
+	w = luaL_checkint(L, 4);
+	h = luaL_checkint(L, 5);
+	id = luaL_checkint(L, 6);
+	del = _luaL_checkbool(L, 7);
+
+	for (screenmap_iterator_t it = W->screenmap.begin(); it != W->screenmap.end(); ++it) {
+		if (it->first == id) {
+			buf = it->second;
+			if (del)
+				it->second = NULL;
+			break;
+		}
+	}
+	if (buf != NULL)
+		W->fbwin->restoreScreen(x, y, w, h, buf, del);
+	return 0;
+}
+
+int CLuaInstance::deleteSavedScreen(lua_State *L)
+{
+	int id;
+	CLuaData *W = CheckData(L, 1);
+	if (!W || !W->fbwin)
+		return 0;
+	id = luaL_checkint(L, 2);
+
+	for (screenmap_iterator_t it = W->screenmap.begin(); it != W->screenmap.end(); ++it) {
+		if (it->first == id) {
+			if (it->second != NULL) {
+				delete[] it->second;
+				it->second = NULL;
+			}
+			break;
+		}
+	}
+	return 0;
+}
+
 int CLuaInstance::GetRevision(lua_State *L)
 {
 	unsigned int ret = 0;
@@ -1083,6 +1154,12 @@ int CLuaInstance::GCWindow(lua_State *L)
 	CLuaData *w = (CLuaData *)lua_unboxpointer(L, 1);
 
 	if (w && w->fbwin) {
+		for (screenmap_iterator_t it = w->screenmap.begin(); it != w->screenmap.end(); ++it) {
+			if (it->second != NULL)
+				delete[] it->second;
+		}
+		DBG1("CLuaInstance::%s delete screenmap\n", __func__);
+		w->screenmap.clear();
 		w->fontmap.clear();
 	}
 	CNeutrinoFonts::getInstance()->deleteDynFontExtAll();

src/gui/luainstance.h

@@ -34,18 +34,23 @@ extern "C" {
 #include <vector>
 
 #define LUA_API_VERSION_MAJOR 1
-#define LUA_API_VERSION_MINOR 13
+#define LUA_API_VERSION_MINOR 14
 
 typedef std::pair<lua_Integer, Font*> fontmap_pair_t;
 typedef std::map<lua_Integer, Font*> fontmap_t;
 typedef fontmap_t::iterator fontmap_iterator_t;
 
+typedef std::pair<lua_Integer, fb_pixel_t*> screenmap_pair_t;
+typedef std::map<lua_Integer, fb_pixel_t*> screenmap_t;
+typedef screenmap_t::iterator screenmap_iterator_t;
+
 /* this is stored as userdata in the lua_State */
 struct CLuaData
 {
 	CFBWindow *fbwin;
 	CRCInput *rcinput;
 	fontmap_t fontmap;
+	screenmap_t screenmap;
 };
 
 struct CLuaMenuItem
@@ -229,6 +234,9 @@ private:
 
 	static int GetRevision(lua_State *L);
 	static int NewWindow(lua_State *L);
+	static int saveScreen(lua_State *L);
+	static int restoreScreen(lua_State *L);
+	static int deleteSavedScreen(lua_State *L);
 	static int PaintBox(lua_State *L);
 	static int PaintIcon(lua_State *L);
 	static int RenderString(lua_State *L);