- Improved efficiency and readability of the RfbBitmap configuration logic. Refactored redundant code blocks for different pixel format (bpp) configurations into a single, streamlined method. This change enhances maintainability and clarity of the bitmap configuration process.

- Added cursor pseudo encoding support.

- Added Windows support for cursor image capturing in `get_cursor_image` method. Implemented Windows-specific logic using the `win32gui`, `win32ui`, and related libraries to capture the current cursor image, enhancing the cross-platform capability of the application.

- Fixed issues in `get_bitmap` method for handling different bpp formats. Specifically addressed the processing logic for 16 bpp (BGR565) format, ensuring that the image conversion and rendering are handled correctly for VNC clients expecting this format.

- Added initial Tight encoding support.

- Updated the `send_image` method in the Tight encoding class to correctly handle JPEG and ZLIB compression. This includes proper signaling to the client about the type of compression used (JPEG or ZLIB) and ensuring that the data is formatted and sent according to the Tight encoding specifications.

- Added checks and conversions in `send_image` to handle different image modes (like RGBX and RGBA) and convert them to the appropriate format (RGB) before compression and transmission.

- Implemented a more robust and accurate method for determining when to use JPEG compression in Tight encoding based on the unique color count and image characteristics.

These updates significantly improve the functionality, stability, and compatibility of the VNC server, particularly in handling different pixel formats and encoding methods.

lib/encodings/zrle.py

@@ -0,0 +1,95 @@
+from . import common
+from lib import log
+import zlib
+from struct import pack
+from PIL import Image
+
+class Encoding:
+    name = 'zrle'
+    id = 16
+    description = 'zrle VNC encoding'
+    enabled = True
+
+    def __init__(self):
+        log.debug("Initialized", __name__)
+        self._compressObj = zlib.compressobj()
+
+
+    def send_image(self, x, y, w, h, image):
+        sendbuff = bytearray()
+        rectangles = 1
+        sendbuff.extend(pack("!BxH", 0, rectangles))  # FramebufferUpdate
+        sendbuff.extend(pack("!HHHH", x, y, w, h))
+        sendbuff.extend(pack(">i", self.id))  # ID de encoding ZRLE
+
+        tmpbuf = bytearray()
+
+        # Dividir la imagen en tiles y comprimirlas
+        for tile_y in range(0, h, 64):
+            for tile_x in range(0, w, 64):
+                tile = image.crop((tile_x, tile_y, min(tile_x + 64, w), min(tile_y + 64, h)))
+                encoded_tile = self.tile_encode(tile)
+                tmpbuf.extend(encoded_tile)
+
+        compressed_data = self._compressObj.compress(tmpbuf)
+        compressed_data += self._compressObj.flush(zlib.Z_SYNC_FLUSH)
+
+        sendbuff.extend(pack("!I", len(compressed_data)))
+        sendbuff.extend(compressed_data)
+        log.debug("zrle send_image", x, y, w, h, image)
+        return sendbuff
+
+    def tile_encode(self, tile):
+        """Codifica una baldosa (tile) de la imagen usando ZRLE."""
+        w, h = tile.size
+        pixels = list(tile.getdata())
+        rle_data = bytearray()
+
+        # Proceso RLE para la baldosa
+        prev_pixel = pixels[0]
+        count = 1
+        for pixel in pixels[1:]:
+            if pixel == prev_pixel and count < 255:
+                count += 1
+            else:
+                rle_data.extend(self._pack_pixel(prev_pixel, count))
+                prev_pixel = pixel
+                count = 1
+        rle_data.extend(self._pack_pixel(prev_pixel, count))
+
+        # Empaquetar la data RLE con el byte de subencoding
+        encoded_tile = bytearray()
+        encoded_tile.append(128)  # Subencoding RLE
+        encoded_tile.extend(rle_data)
+
+        return encoded_tile
+
+    def _pack_pixel(self, pixel, count):
+        if isinstance(pixel, tuple):
+            # RGBA
+            r, g, b, a = pixel
+            pixel_data = bytes([r, g, b])  # Usar solo RGB para ZRLE.
+        else:
+            pixel_data = bytes([pixel, pixel, pixel])
+
+        count_data = self._encode_run_length(count)
+        return pixel_data + count_data
+
+    def _encode_run_length(self, length):
+        """Codifica la longitud de una secuencia para RLE."""
+        if length == 1:
+            return b""
+        length -= 1  # La longitud se incrementa en 1 según el protocolo ZRLE
+        encoded_length = bytearray()
+        while length > 0:
+            byte = length % 255
+            encoded_length.append(byte)
+            length //= 255
+            if length > 0:
+                encoded_length.append(255)
+        return encoded_length
+
+
+common.encodings[common.ENCODINGS.zrle] = Encoding
+
+log.debug("Loaded encoding: %s (%s)" % (__name__, Encoding.id))