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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-14 16:43:12 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-14 16:43:12 +0530
commitd47f8b48935d258f4c5c3e2267911753bebd5214 (patch)
tree3ed04e75bc3fc7c8e4ce618f527565da1df630a1 /env/lib/python3.10/site-packages/PIL/PyAccess.py
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diff --git a/env/lib/python3.10/site-packages/PIL/PyAccess.py b/env/lib/python3.10/site-packages/PIL/PyAccess.py
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-#
-# The Python Imaging Library
-# Pillow fork
-#
-# Python implementation of the PixelAccess Object
-#
-# Copyright (c) 1997-2009 by Secret Labs AB. All rights reserved.
-# Copyright (c) 1995-2009 by Fredrik Lundh.
-# Copyright (c) 2013 Eric Soroos
-#
-# See the README file for information on usage and redistribution
-#
-
-# Notes:
-#
-# * Implements the pixel access object following Access.
-# * Does not implement the line functions, as they don't appear to be used
-# * Taking only the tuple form, which is used from python.
-# * Fill.c uses the integer form, but it's still going to use the old
-# Access.c implementation.
-#
-
-import logging
-import sys
-
-try:
- from cffi import FFI
-
- defs = """
- struct Pixel_RGBA {
- unsigned char r,g,b,a;
- };
- struct Pixel_I16 {
- unsigned char l,r;
- };
- """
- ffi = FFI()
- ffi.cdef(defs)
-except ImportError as ex:
- # Allow error import for doc purposes, but error out when accessing
- # anything in core.
- from ._util import DeferredError
-
- FFI = ffi = DeferredError(ex)
-
-logger = logging.getLogger(__name__)
-
-
-class PyAccess:
- def __init__(self, img, readonly=False):
- vals = dict(img.im.unsafe_ptrs)
- self.readonly = readonly
- self.image8 = ffi.cast("unsigned char **", vals["image8"])
- self.image32 = ffi.cast("int **", vals["image32"])
- self.image = ffi.cast("unsigned char **", vals["image"])
- self.xsize, self.ysize = img.im.size
- self._img = img
-
- # Keep pointer to im object to prevent dereferencing.
- self._im = img.im
- if self._im.mode in ("P", "PA"):
- self._palette = img.palette
-
- # Debugging is polluting test traces, only useful here
- # when hacking on PyAccess
- # logger.debug("%s", vals)
- self._post_init()
-
- def _post_init(self):
- pass
-
- def __setitem__(self, xy, color):
- """
- Modifies the pixel at x,y. The color is given as a single
- numerical value for single band images, and a tuple for
- multi-band images
-
- :param xy: The pixel coordinate, given as (x, y). See
- :ref:`coordinate-system`.
- :param color: The pixel value.
- """
- if self.readonly:
- raise ValueError("Attempt to putpixel a read only image")
- (x, y) = xy
- if x < 0:
- x = self.xsize + x
- if y < 0:
- y = self.ysize + y
- (x, y) = self.check_xy((x, y))
-
- if (
- self._im.mode in ("P", "PA")
- and isinstance(color, (list, tuple))
- and len(color) in [3, 4]
- ):
- # RGB or RGBA value for a P or PA image
- if self._im.mode == "PA":
- alpha = color[3] if len(color) == 4 else 255
- color = color[:3]
- color = self._palette.getcolor(color, self._img)
- if self._im.mode == "PA":
- color = (color, alpha)
-
- return self.set_pixel(x, y, color)
-
- def __getitem__(self, xy):
- """
- Returns the pixel at x,y. The pixel is returned as a single
- value for single band images or a tuple for multiple band
- images
-
- :param xy: The pixel coordinate, given as (x, y). See
- :ref:`coordinate-system`.
- :returns: a pixel value for single band images, a tuple of
- pixel values for multiband images.
- """
- (x, y) = xy
- if x < 0:
- x = self.xsize + x
- if y < 0:
- y = self.ysize + y
- (x, y) = self.check_xy((x, y))
- return self.get_pixel(x, y)
-
- putpixel = __setitem__
- getpixel = __getitem__
-
- def check_xy(self, xy):
- (x, y) = xy
- if not (0 <= x < self.xsize and 0 <= y < self.ysize):
- raise ValueError("pixel location out of range")
- return xy
-
-
-class _PyAccess32_2(PyAccess):
- """PA, LA, stored in first and last bytes of a 32 bit word"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = ffi.cast("struct Pixel_RGBA **", self.image32)
-
- def get_pixel(self, x, y):
- pixel = self.pixels[y][x]
- return pixel.r, pixel.a
-
- def set_pixel(self, x, y, color):
- pixel = self.pixels[y][x]
- # tuple
- pixel.r = min(color[0], 255)
- pixel.a = min(color[1], 255)
-
-
-class _PyAccess32_3(PyAccess):
- """RGB and friends, stored in the first three bytes of a 32 bit word"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = ffi.cast("struct Pixel_RGBA **", self.image32)
-
- def get_pixel(self, x, y):
- pixel = self.pixels[y][x]
- return pixel.r, pixel.g, pixel.b
-
- def set_pixel(self, x, y, color):
- pixel = self.pixels[y][x]
- # tuple
- pixel.r = min(color[0], 255)
- pixel.g = min(color[1], 255)
- pixel.b = min(color[2], 255)
- pixel.a = 255
-
-
-class _PyAccess32_4(PyAccess):
- """RGBA etc, all 4 bytes of a 32 bit word"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = ffi.cast("struct Pixel_RGBA **", self.image32)
-
- def get_pixel(self, x, y):
- pixel = self.pixels[y][x]
- return pixel.r, pixel.g, pixel.b, pixel.a
-
- def set_pixel(self, x, y, color):
- pixel = self.pixels[y][x]
- # tuple
- pixel.r = min(color[0], 255)
- pixel.g = min(color[1], 255)
- pixel.b = min(color[2], 255)
- pixel.a = min(color[3], 255)
-
-
-class _PyAccess8(PyAccess):
- """1, L, P, 8 bit images stored as uint8"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = self.image8
-
- def get_pixel(self, x, y):
- return self.pixels[y][x]
-
- def set_pixel(self, x, y, color):
- try:
- # integer
- self.pixels[y][x] = min(color, 255)
- except TypeError:
- # tuple
- self.pixels[y][x] = min(color[0], 255)
-
-
-class _PyAccessI16_N(PyAccess):
- """I;16 access, native bitendian without conversion"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = ffi.cast("unsigned short **", self.image)
-
- def get_pixel(self, x, y):
- return self.pixels[y][x]
-
- def set_pixel(self, x, y, color):
- try:
- # integer
- self.pixels[y][x] = min(color, 65535)
- except TypeError:
- # tuple
- self.pixels[y][x] = min(color[0], 65535)
-
-
-class _PyAccessI16_L(PyAccess):
- """I;16L access, with conversion"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = ffi.cast("struct Pixel_I16 **", self.image)
-
- def get_pixel(self, x, y):
- pixel = self.pixels[y][x]
- return pixel.l + pixel.r * 256
-
- def set_pixel(self, x, y, color):
- pixel = self.pixels[y][x]
- try:
- color = min(color, 65535)
- except TypeError:
- color = min(color[0], 65535)
-
- pixel.l = color & 0xFF # noqa: E741
- pixel.r = color >> 8
-
-
-class _PyAccessI16_B(PyAccess):
- """I;16B access, with conversion"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = ffi.cast("struct Pixel_I16 **", self.image)
-
- def get_pixel(self, x, y):
- pixel = self.pixels[y][x]
- return pixel.l * 256 + pixel.r
-
- def set_pixel(self, x, y, color):
- pixel = self.pixels[y][x]
- try:
- color = min(color, 65535)
- except Exception:
- color = min(color[0], 65535)
-
- pixel.l = color >> 8 # noqa: E741
- pixel.r = color & 0xFF
-
-
-class _PyAccessI32_N(PyAccess):
- """Signed Int32 access, native endian"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = self.image32
-
- def get_pixel(self, x, y):
- return self.pixels[y][x]
-
- def set_pixel(self, x, y, color):
- self.pixels[y][x] = color
-
-
-class _PyAccessI32_Swap(PyAccess):
- """I;32L/B access, with byteswapping conversion"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = self.image32
-
- def reverse(self, i):
- orig = ffi.new("int *", i)
- chars = ffi.cast("unsigned char *", orig)
- chars[0], chars[1], chars[2], chars[3] = chars[3], chars[2], chars[1], chars[0]
- return ffi.cast("int *", chars)[0]
-
- def get_pixel(self, x, y):
- return self.reverse(self.pixels[y][x])
-
- def set_pixel(self, x, y, color):
- self.pixels[y][x] = self.reverse(color)
-
-
-class _PyAccessF(PyAccess):
- """32 bit float access"""
-
- def _post_init(self, *args, **kwargs):
- self.pixels = ffi.cast("float **", self.image32)
-
- def get_pixel(self, x, y):
- return self.pixels[y][x]
-
- def set_pixel(self, x, y, color):
- try:
- # not a tuple
- self.pixels[y][x] = color
- except TypeError:
- # tuple
- self.pixels[y][x] = color[0]
-
-
-mode_map = {
- "1": _PyAccess8,
- "L": _PyAccess8,
- "P": _PyAccess8,
- "LA": _PyAccess32_2,
- "La": _PyAccess32_2,
- "PA": _PyAccess32_2,
- "RGB": _PyAccess32_3,
- "LAB": _PyAccess32_3,
- "HSV": _PyAccess32_3,
- "YCbCr": _PyAccess32_3,
- "RGBA": _PyAccess32_4,
- "RGBa": _PyAccess32_4,
- "RGBX": _PyAccess32_4,
- "CMYK": _PyAccess32_4,
- "F": _PyAccessF,
- "I": _PyAccessI32_N,
-}
-
-if sys.byteorder == "little":
- mode_map["I;16"] = _PyAccessI16_N
- mode_map["I;16L"] = _PyAccessI16_N
- mode_map["I;16B"] = _PyAccessI16_B
-
- mode_map["I;32L"] = _PyAccessI32_N
- mode_map["I;32B"] = _PyAccessI32_Swap
-else:
- mode_map["I;16"] = _PyAccessI16_L
- mode_map["I;16L"] = _PyAccessI16_L
- mode_map["I;16B"] = _PyAccessI16_N
-
- mode_map["I;32L"] = _PyAccessI32_Swap
- mode_map["I;32B"] = _PyAccessI32_N
-
-
-def new(img, readonly=False):
- access_type = mode_map.get(img.mode, None)
- if not access_type:
- logger.debug("PyAccess Not Implemented: %s", img.mode)
- return None
- return access_type(img, readonly)