Add support to draw images via MCP on the RLCD display

mcp_server.py

@@ -169,6 +169,20 @@ class MCPServer:
                             "name": "get_screenshot",
                             "description": "Capture the current reflective LCD screen rendering as a PNG image.",
                             "inputSchema": {"type": "object", "properties": {}}
+                        },
+                        {
+                            "name": "draw_image",
+                            "description": "Draw an image (PNG, JPEG, GIF, BMP, etc.) on the screen. The image will be converted to 1-bit monochrome and fit to display boundaries.",
+                            "inputSchema": {
+                                "type": "object",
+                                "properties": {
+                                    "image_base64": {"type": "string", "description": "Base64 encoded string of the source image file"},
+                                    "x": {"type": "integer", "description": "X coordinate to place the image (default 0)", "default": 0},
+                                    "y": {"type": "integer", "description": "Y coordinate to place the image (default 0)", "default": 0},
+                                    "dither": {"type": "boolean", "description": "Whether to use Floyd-Steinberg dithering (default true)", "default": True}
+                                },
+                                "required": ["image_base64"]
+                            }
                         }
                     ]
                 },
@@ -280,6 +294,35 @@ class MCPServer:
                 return f"__PBM_BASE64__:{b64}"
             except Exception as e:
                 raise RuntimeError(f"Screenshot capture failed: {e}")
+                
+        elif name == "draw_image":
+            self.override_active = True
+            self.override_timeout = time.ticks_ms() + 30000 # 30-sec override
+            
+            pbm_b64 = args.get("pbm_base64")
+            x = int(args.get("x", 0))
+            y = int(args.get("y", 0))
+            
+            if not pbm_b64:
+                raise ValueError("Missing pbm_base64 parameter (preprocessed by bridge)")
+                
+            import binascii
+            pbm_bytes = binascii.a2b_base64(pbm_b64)
+            
+            filename = 'temp_recv.pbm'
+            with open(filename, 'wb') as f:
+                f.write(pbm_bytes)
+                
+            try:
+                self.display.draw_pbm(filename, x, y, scale=1)
+                self.display.show()
+            finally:
+                import os
+                try:
+                    os.remove(filename)
+                except:
+                    pass
+            return "Image displayed successfully."
             
         else:
             raise ValueError(f"Unknown tool: {name}")