297 lines
8.3 KiB
Python
297 lines
8.3 KiB
Python
#
|
|
# 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.
|
|
#
|
|
|
|
from __future__ import print_function
|
|
|
|
from cffi import FFI
|
|
import sys
|
|
|
|
DEBUG = 0
|
|
|
|
defs = """
|
|
struct Pixel_RGBA {
|
|
unsigned char r,g,b,a;
|
|
};
|
|
struct Pixel_I16 {
|
|
unsigned char l,r;
|
|
};
|
|
"""
|
|
ffi = FFI()
|
|
ffi.cdef(defs)
|
|
|
|
|
|
class PyAccess(object):
|
|
|
|
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 = vals['xsize']
|
|
self.ysize = vals['ysize']
|
|
|
|
if DEBUG:
|
|
print (vals)
|
|
self._post_init()
|
|
|
|
def _post_init(): 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).
|
|
:param value: The pixel value.
|
|
"""
|
|
if self.readonly: raise ValueError('Attempt to putpixel a read only image')
|
|
(x,y) = self.check_xy(xy)
|
|
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).
|
|
"""
|
|
|
|
(x,y) = self.check_xy(xy)
|
|
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)
|
|
|
|
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:
|
|
# 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:
|
|
# 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:
|
|
color = min(color[0], 65535)
|
|
|
|
pixel.l = color & 0xFF
|
|
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:
|
|
color = min(color[0], 65535)
|
|
|
|
pixel.l = color >> 8
|
|
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:
|
|
# tuple
|
|
self.pixels[y][x] = color[0]
|
|
|
|
|
|
mode_map = {'1': _PyAccess8,
|
|
'L': _PyAccess8,
|
|
'P': _PyAccess8,
|
|
'LA': _PyAccess32_2,
|
|
'PA': _PyAccess32_2,
|
|
'RGB': _PyAccess32_3,
|
|
'LAB': _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:
|
|
if DEBUG: print ("PyAccess Not Implemented: %s" % img.mode)
|
|
return None
|
|
if DEBUG: print ("New PyAccess: %s" % img.mode)
|
|
return access_type(img, readonly)
|
|
|
|
|