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cythonize dither_image

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kris 2021-01-12 10:00:56 +00:00
parent 3e7cb37253
commit 32d54d5b78
2 changed files with 73 additions and 30 deletions
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36
dither.py
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@ -3,6 +3,7 @@ import bz2
import functools
import os.path
import pickle
import time
from typing import Tuple
from PIL import Image
@ -282,8 +283,8 @@ class Dither:
def apply(self, screen: Screen, image: np.ndarray, x: int, y: int,
quant_error: np.ndarray, one_line=False):
#el, er, xl, xr = self.x_dither_bounds(screen, x)
#et, eb, yt, yb = self.y_dither_bounds(screen, y, one_line)
# el, er, xl, xr = self.x_dither_bounds(screen, x)
# et, eb, yt, yb = self.y_dither_bounds(screen, y, one_line)
return dither_apply.apply(self, screen, x, y, image, quant_error)
# error = self.PATTERN * quant_error.reshape((1, 1, 3))
#
@ -361,26 +362,6 @@ def open_image(screen: Screen, filename: str) -> np.ndarray:
SRGBResize(im, (screen.X_RES, screen.Y_RES), Image.LANCZOS))
@functools.lru_cache(None)
def lookahead_options(screen, lookahead, last_pixel_4bit, x):
options_4bit = np.empty((2 ** lookahead, lookahead), dtype=np.uint8)
options_rgb = np.empty((2 ** lookahead, lookahead, 3), dtype=np.float32)
for i in range(2 ** lookahead):
output_pixel_4bit = last_pixel_4bit
for j in range(lookahead):
xx = x + j
palette_choices_4bit, palette_choices_rgb = \
screen.pixel_palette_options(output_pixel_4bit, xx)
output_pixel_4bit = palette_choices_4bit[(i & (1 << j)) >> j]
output_pixel_rgb = np.array(
palette_choices_rgb[(i & (1 << j)) >> j])
# XXX copy
options_4bit[i, j] = output_pixel_4bit
options_rgb[i, j, :] = np.copy(output_pixel_rgb)
return options_4bit, options_rgb
def dither_lookahead(
screen: Screen, image_rgb: np.ndarray, dither: Dither, differ:
ColourDistance, x, y, last_pixel_4bit, lookahead
@ -439,7 +420,7 @@ def dither_image(
print(y)
output_pixel_4bit = np.uint8(0)
for x in range(screen.X_RES):
input_pixel_rgb = np.copy(image_rgb[y, x, :])
input_pixel_rgb = image_rgb[y, x, :]
options_4bit, options_rgb = lookahead_options(
screen, lookahead, output_pixel_4bit, x % 4)
@ -448,9 +429,9 @@ def dither_image(
screen, image_rgb, dither, differ, x, y, options_4bit,
options_rgb,
lookahead)
quant_error = input_pixel_rgb - output_pixel_rgb
image_4bit[y, x] = output_pixel_4bit
image_rgb[y, x, :] = output_pixel_rgb
quant_error = input_pixel_rgb - output_pixel_rgb
dither_apply.apply(dither, screen, x, y, image_rgb, quant_error)
return image_4bit, image_rgb
@ -478,8 +459,11 @@ def main():
differ = CIE2000Distance()
output_4bit, output_rgb = dither_image(screen, image, dither, differ,
lookahead=args.lookahead)
start = time.time()
output_4bit, output_rgb = dither_apply.dither_image(screen, image, dither,
differ,
lookahead=args.lookahead)
print(time.time() - start)
screen.pack(output_4bit)
out_image = Image.fromarray(linear_to_srgb(output_rgb).astype(np.uint8))

67
dither_apply.pyx
View File

@ -3,7 +3,7 @@
cimport cython
import numpy as np
# from cython.parallel import prange
# from cython.view cimport array as cvarray
from cython.view cimport array as cvarray
# from libc.stdlib cimport malloc, free
@ -27,7 +27,7 @@ cdef void apply_one_line(float[:, :, ::1] pattern, int xl, int xr, float[:, ::1]
@cython.boundscheck(False)
@cython.wraparound(False)
def apply(dither, screen, int x, int y, float [:, :, ::1]image, float[::1] quant_error):
cdef apply(dither, screen, int x, int y, float [:, :, ::1]image, float[] quant_error):
cdef int i, j, k
# XXX only need 2 dimensions now
@ -89,8 +89,8 @@ def dither_lookahead(
cdef int i, j, k, l
cdef float[:, :, ::1] lah_image_rgb = np.empty(
(2 ** lookahead, lookahead + xr - xl, 3), dtype=np.float32)
# XXX malloc
cdef float[:, :, ::1] lah_image_rgb = cvarray((2 ** lookahead, lookahead + xr - xl, 3), itemsize=sizeof(float), format="f")
for i in range(2**lookahead):
# Copies of input pixels so we can dither in bulk
for j in range(xxr - x):
@ -143,3 +143,62 @@ def dither_lookahead(
best = i
return options_4bit[best, 0], options_rgb[best, 0, :]
import functools
@functools.lru_cache(None)
def lookahead_options(screen, lookahead, last_pixel_4bit, x):
options_4bit = np.empty((2 ** lookahead, lookahead), dtype=np.uint8)
options_rgb = np.empty((2 ** lookahead, lookahead, 3), dtype=np.float32)
for i in range(2 ** lookahead):
output_pixel_4bit = last_pixel_4bit
for j in range(lookahead):
xx = x + j
palette_choices_4bit, palette_choices_rgb = \
screen.pixel_palette_options(output_pixel_4bit, xx)
output_pixel_4bit = palette_choices_4bit[(i & (1 << j)) >> j]
output_pixel_rgb = np.array(
palette_choices_rgb[(i & (1 << j)) >> j])
# XXX copy
options_4bit[i, j] = output_pixel_4bit
options_rgb[i, j, :] = np.copy(output_pixel_rgb)
return options_4bit, options_rgb
@cython.boundscheck(False)
@cython.wraparound(False)
def dither_image(
screen, float [:, :, ::1] image_rgb, dither, differ, int lookahead):
image_4bit = np.empty(
(image_rgb.shape[0], image_rgb.shape[1]), dtype=np.uint8)
cdef int yres = screen.Y_RES
cdef int xres = screen.X_RES
cdef int y, x, i
cdef float[3] quant_error
cdef (unsigned char)[:, ::1] options_4bit
cdef float[:, :, ::1] options_rgb
for y in range(yres):
# print(y)
output_pixel_4bit = np.uint8(0)
for x in range(xres):
input_pixel_rgb = image_rgb[y, x, :]
options_4bit, options_rgb = lookahead_options(
screen, lookahead, output_pixel_4bit, x % 4)
output_pixel_4bit, output_pixel_rgb = \
dither_lookahead(
screen, image_rgb, dither, differ, x, y, options_4bit,
options_rgb, lookahead)
for i in range(3):
quant_error[i] = input_pixel_rgb[i] - output_pixel_rgb[i]
image_rgb[y, x, i] = output_pixel_rgb[i]
image_4bit[y, x] = output_pixel_4bit
apply(dither, screen, x, y, image_rgb, quant_error)
return image_4bit, np.array(image_rgb)