Updated script that can be controled by Nodejs web app

lib/python3.13/site-packages/PIL/QoiImagePlugin.py

@@ -0,0 +1,115 @@
+#
+# The Python Imaging Library.
+#
+# QOI support for PIL
+#
+# See the README file for information on usage and redistribution.
+#
+from __future__ import annotations
+
+import os
+
+from . import Image, ImageFile
+from ._binary import i32be as i32
+
+
+def _accept(prefix: bytes) -> bool:
+    return prefix[:4] == b"qoif"
+
+
+class QoiImageFile(ImageFile.ImageFile):
+    format = "QOI"
+    format_description = "Quite OK Image"
+
+    def _open(self) -> None:
+        if not _accept(self.fp.read(4)):
+            msg = "not a QOI file"
+            raise SyntaxError(msg)
+
+        self._size = i32(self.fp.read(4)), i32(self.fp.read(4))
+
+        channels = self.fp.read(1)[0]
+        self._mode = "RGB" if channels == 3 else "RGBA"
+
+        self.fp.seek(1, os.SEEK_CUR)  # colorspace
+        self.tile = [ImageFile._Tile("qoi", (0, 0) + self._size, self.fp.tell(), None)]
+
+
+class QoiDecoder(ImageFile.PyDecoder):
+    _pulls_fd = True
+    _previous_pixel: bytes | bytearray | None = None
+    _previously_seen_pixels: dict[int, bytes | bytearray] = {}
+
+    def _add_to_previous_pixels(self, value: bytes | bytearray) -> None:
+        self._previous_pixel = value
+
+        r, g, b, a = value
+        hash_value = (r * 3 + g * 5 + b * 7 + a * 11) % 64
+        self._previously_seen_pixels[hash_value] = value
+
+    def decode(self, buffer: bytes | Image.SupportsArrayInterface) -> tuple[int, int]:
+        assert self.fd is not None
+
+        self._previously_seen_pixels = {}
+        self._add_to_previous_pixels(bytearray((0, 0, 0, 255)))
+
+        data = bytearray()
+        bands = Image.getmodebands(self.mode)
+        dest_length = self.state.xsize * self.state.ysize * bands
+        while len(data) < dest_length:
+            byte = self.fd.read(1)[0]
+            value: bytes | bytearray
+            if byte == 0b11111110 and self._previous_pixel:  # QOI_OP_RGB
+                value = bytearray(self.fd.read(3)) + self._previous_pixel[3:]
+            elif byte == 0b11111111:  # QOI_OP_RGBA
+                value = self.fd.read(4)
+            else:
+                op = byte >> 6
+                if op == 0:  # QOI_OP_INDEX
+                    op_index = byte & 0b00111111
+                    value = self._previously_seen_pixels.get(
+                        op_index, bytearray((0, 0, 0, 0))
+                    )
+                elif op == 1 and self._previous_pixel:  # QOI_OP_DIFF
+                    value = bytearray(
+                        (
+                            (self._previous_pixel[0] + ((byte & 0b00110000) >> 4) - 2)
+                            % 256,
+                            (self._previous_pixel[1] + ((byte & 0b00001100) >> 2) - 2)
+                            % 256,
+                            (self._previous_pixel[2] + (byte & 0b00000011) - 2) % 256,
+                            self._previous_pixel[3],
+                        )
+                    )
+                elif op == 2 and self._previous_pixel:  # QOI_OP_LUMA
+                    second_byte = self.fd.read(1)[0]
+                    diff_green = (byte & 0b00111111) - 32
+                    diff_red = ((second_byte & 0b11110000) >> 4) - 8
+                    diff_blue = (second_byte & 0b00001111) - 8
+
+                    value = bytearray(
+                        tuple(
+                            (self._previous_pixel[i] + diff_green + diff) % 256
+                            for i, diff in enumerate((diff_red, 0, diff_blue))
+                        )
+                    )
+                    value += self._previous_pixel[3:]
+                elif op == 3 and self._previous_pixel:  # QOI_OP_RUN
+                    run_length = (byte & 0b00111111) + 1
+                    value = self._previous_pixel
+                    if bands == 3:
+                        value = value[:3]
+                    data += value * run_length
+                    continue
+            self._add_to_previous_pixels(value)
+
+            if bands == 3:
+                value = value[:3]
+            data += value
+        self.set_as_raw(data)
+        return -1, 0
+
+
+Image.register_open(QoiImageFile.format, QoiImageFile, _accept)
+Image.register_decoder("qoi", QoiDecoder)
+Image.register_extension(QoiImageFile.format, ".qoi")