core.get_pixel_color(texture_path, x, y)

1.patch

commit 4ec99632b153a9a3ecf6cf123353f675ba12b1d6
Author: Jean-Patrick Guerrero <kilbith@users.noreply.github.com>
Date:   Wed Nov 16 01:58:15 2022 +0100

    Add core.get_pixel_color()

diff --git a/src/script/lua_api/l_server.cpp b/src/script/lua_api/l_server.cpp
index a5daae346..a0b90087c 100644
--- a/src/script/lua_api/l_server.cpp
+++ b/src/script/lua_api/l_server.cpp
@@ -29,6 +29,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "environment.h"
 #include "remoteplayer.h"
 #include "log.h"
+#include "filesys.h"
+#include "client/renderingengine.h"
 #include <algorithm>
 
 // request_shutdown()
@@ -596,6 +598,31 @@ int ModApiServer::l_serialize_roundtrip(lua_State *L)
 	return 1;
 }
 
+// get_pixel_color()
+int ModApiServer::l_get_pixel_color(lua_State *L)
+{	
+	auto driver = RenderingEngine::get_video_driver();
+
+	std::string path = readParam<std::string>(L, 1);
+	video::ITexture *texture = driver->getTexture(path.c_str());
+
+	if (!texture)
+		return 0;
+
+	auto img = driver->createImage(texture, core::position2d<s32>(), texture->getSize());
+	int x = readParam<int>(L, 2);
+	int y = readParam<int>(L, 3);
+
+	video::SColor px = img->getPixel(x, y);
+	char buf[16+1];
+
+	snprintf(buf, sizeof buf, "#%02x%02x%02x", px.getRed(), px.getGreen(), px.getBlue());
+
+	lua_pushstring(L, buf);
+	
+	return 1;
+}
+
 void ModApiServer::Initialize(lua_State *L, int top)
 {
 	API_FCT(request_shutdown);
@@ -633,6 +660,8 @@ void ModApiServer::Initialize(lua_State *L, int top)
 	API_FCT(do_async_callback);
 	API_FCT(register_async_dofile);
 	API_FCT(serialize_roundtrip);
+
+	API_FCT(get_pixel_color);
 }
 
 void ModApiServer::InitializeAsync(lua_State *L, int top)
diff --git a/src/script/lua_api/l_server.h b/src/script/lua_api/l_server.h
index a4f38c34e..4328ed976 100644
--- a/src/script/lua_api/l_server.h
+++ b/src/script/lua_api/l_server.h
@@ -115,6 +115,9 @@ class ModApiServer : public ModApiBase
 	// serialize_roundtrip(obj)
 	static int l_serialize_roundtrip(lua_State *L);
 
+	// get_pixel_color()
+	static int l_get_pixel_color(lua_State *L);
+
 public:
 	static void Initialize(lua_State *L, int top);
 	static void InitializeAsync(lua_State *L, int top);