dabugger: Add support for custom DAP messages for palette changes

This implements "xsystem35.palette" custom request and
"xsystem35.paletteChanged" custom event, introduced in
kichikuou/xsystem35-sdl2@4b15f45.

src/debugger/dap_frontend.cpp

@@ -8,6 +8,7 @@
 #include "common.h"
 #include "encoding.h"
 #include "nact.h"
+#include "ags.h"
 #include "debugger/debugger.h"
 using Json = nlohmann::json;
 
@@ -107,6 +108,14 @@ public:
 	}
 
 	void on_palette_change() override {
+		Json event = {
+			{"type", "event"},
+			{"event", "xsystem35.paletteChanged"},
+			{"body", {
+				{"version", ++palette_version}
+			}}
+		};
+		send_json(event);
 	}
 
 	bool console_output(const char* format, va_list ap) override {
@@ -225,6 +234,8 @@ private:
 		} else if (command == "next") {
 			cmd_next(args, resp);
 			continue_repl = false;
+		} else if (command == "xsystem35.palette") {
+			cmd_palette(args, resp);
 		} else {
 			fprintf(stderr, "Unknown command '%s'\n", command.c_str());
 			resp["success"] = false;
@@ -498,10 +509,19 @@ private:
 		resp["success"] = true;
 	}
 
+	void cmd_palette(Json& args, Json& resp) {
+		resp["success"] = true;
+		resp["body"] = {
+			{"version", palette_version},
+			{"palette", g_nact->ags->get_screen_palette()},
+		};
+	}
+
 	std::queue<char*> queue;
 	bool initialized = false;
 	int seq_ = 0;
 	std::string src_dir;
+	unsigned palette_version = 0;
 };
 
 // static

src/sys/ags.h

@@ -103,6 +103,7 @@ public:
 	void set_cg_file(const char *file_name);
 
 	void set_palette(int index, int r, int g, int b);
+	const Palette& get_screen_palette() const { return screen_palette; }
 	uint8 get_pixel(int dest, int x, int y);
 	void set_pixel(int dest, int x, int y, uint8 color);
 

src/sys/ags_draw.cpp

@@ -12,6 +12,7 @@
 #include <string.h>
 #include "dri.h"
 #include "game_id.h"
+#include "debugger/debugger.h"
 
 void AGS::load_cg(int page, int transparent)
 {
@@ -71,6 +72,10 @@ void AGS::load_cg(int page, int transparent)
 		}
 		break;
 	}
+#ifdef ENABLE_DEBUGGER
+	if (g_debugger)
+		g_debugger->on_palette_change();
+#endif
 }
 
 void AGS::copy(int sx, int sy, int ex, int ey, int dx, int dy)

src/sys/nact.cpp

@@ -132,6 +132,10 @@ void NACT::execute()
 		// パレット設定が終わった
 		ags->flush_screen(true);
 		set_palette = false;
+#ifdef ENABLE_DEBUGGER
+		if (g_debugger)
+			g_debugger->on_palette_change();
+#endif
 	}
 	if(verb_obj && cmd != '[' && cmd != ':') {
 		// 動詞-目的語メニューの表示

src/sys/nact.h

@@ -100,9 +100,9 @@ public:
 	virtual ~NACT();
 
 	Scenario sco;
+	AGS* ags;
 
 protected:
-	AGS* ags;
 	MAKO* mako;
 	MsgSkip* msgskip;