Apple-2-SW
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ii-pix
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Optimize morer

This commit is contained in:
kris 2021-01-11 22:19:41 +00:00
parent 5c07469751
commit 6b890a9b75
2 changed files with 14 additions and 36 deletions
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2
dither.py
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@ -146,7 +146,7 @@ class CIE2000Distance(ColourDistance):
return (rgb[..., 0] << 16) + (rgb[..., 1] << 8) + (rgb[..., 2])
def distance(self, rgb: np.ndarray, bit4: np.ndarray) -> np.ndarray:
rgb24 = self._flatten_rgb(np.clip(rgb, 0, 255).astype(np.int))
rgb24 = self._flatten_rgb(rgb)
return self._distances[rgb24, bit4].astype(np.int)

48
dither_apply.pyx
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@ -50,27 +50,6 @@ cdef x_dither_bounds(float [:, :, ::1] pattern, int x_origin, int x_res, int x):
return el, er, xl, xr
cdef long* flatten_rgb(float [:, :, ::1] rgb):
cdef i, j, k
cdef long *flat = <long *> malloc(rgb.shape[0] * rgb.shape[1] * sizeof(long))
for i in range(rgb.shape[0]):
for j in range(rgb.shape[1]):
for k in range(rgb.shape[2]):
flat[i * rgb.shape[1] + j] = (int(rgb[i, j, 0]) << 16) + (int(rgb[i, j, 1]) << 8) + (int(rgb[i, j, 2]))
return flat
cdef char* distance(char [:, ::1] distances, float [:, :, ::1] rgb, char [:, ::1] bit4):
flat = flatten_rgb(rgb)
cdef char *dist = <char *> malloc(rgb.shape[0] * rgb.shape[1] * sizeof(char))
for i in range(rgb.shape[0]):
for j in range(rgb.shape[1]):
dist[i * rgb.shape[1] + j] = distances[flat[i * rgb.shape[1] + j], bit4[i, j]]
free(flat)
return dist
def dither_lookahead(
screen, float[:,:,::1] image_rgb, dither, differ, int x, int y, char[:, ::1] options_4bit,
float[:, :, ::1] options_rgb, int lookahead):
@ -112,30 +91,29 @@ def dither_lookahead(
free(quant_error)
# Clip lah_image_rgb into 0..255 range to prepare for computing colour distance
#for i in range(2**lookahead):
# for j in range(lookahead):
# for k in range(3):
# lah_image_rgb[i, j, k] = clip(lah_image_rgb[i, j, k], 0, 255)
# cdef char* error = distance(differ._distances, lah_image_rgb[:, 0:lookahead, :], options_4bit)
# differ.distance(lah_image_rgb[:, 0:lookahead, :], options_4bit)
cdef long[:, ::1] error = differ.distance(lah_image_rgb[:, 0:lookahead, :], options_4bit)
cdef int best
cdef int best_error = 2**31-1
cdef int total_error
cdef long flat, dist, bit4
cdef long r, g, b
cdef (unsigned char)[:, ::1] distances = differ._distances
for i in range(2**lookahead):
total_error = 0
for j in range(lookahead):
total_error += error[i, j] ** 2
# Clip lah_image_rgb into 0..255 range to prepare for computing colour distance
r = long(clip(lah_image_rgb[i, j, 0], 0, 255))
g = long(clip(lah_image_rgb[i, j, 1], 0, 255))
b = long(clip(lah_image_rgb[i, j, 2], 0, 255))
flat = (r << 16) + (g << 8) + b
bit4 = options_4bit[i, j]
dist = distances[flat, bit4]
total_error += dist ** 2
if total_error >= best_error:
break
if total_error < best_error:
best_error = total_error
best = i
#cdef long[::1] total_error = np.sum(np.power(error, 2), axis=1)
#cdef int best = np.argmin(total_error)
# free(error)
return options_4bit[best, 0], options_rgb[best, 0, :]