Apple-2-SW/ii-pix
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Tidy up a bit in preparation for merge.

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kris 2021-03-15 10:45:57 +00:00
parent 467a0cd196
commit e1108b4dd0
1 changed files with 28 additions and 28 deletions
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56
dither.pyx
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@ -55,28 +55,28 @@ cdef int dither_bounds_yb(Dither *dither, int y_res, int y):
@cython.boundscheck(False)
@cython.wraparound(False)
@functools.lru_cache(None)
def lookahead_options(screen, lookahead, last_pixel_4bit, x):
options_4bit = np.empty((2 ** lookahead, lookahead), dtype=np.uint8)
def lookahead_options(screen, lookahead, last_pixel_nbit, x):
options_nbit = 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
output_pixel_nbit = last_pixel_nbit
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]
palette_choices_nbit, palette_choices_rgb = \
screen.pixel_palette_options(output_pixel_nbit, xx)
output_pixel_nbit = palette_choices_nbit[(i & (1 << j)) >> j]
output_pixel_rgb = np.array(
palette_choices_rgb[(i & (1 << j)) >> j])
options_4bit[i, j] = output_pixel_4bit
options_nbit[i, j] = output_pixel_nbit
options_rgb[i, j, :] = output_pixel_rgb
return options_4bit, options_rgb
return options_nbit, options_rgb
@cython.boundscheck(False)
@cython.wraparound(False)
cdef dither_lookahead(Dither* dither,
screen, Image* image_rgb, int x, int y, unsigned char[:, ::1] options_4bit,
screen, Image* image_rgb, int x, int y, unsigned char[:, ::1] options_nbit,
float[:, :, ::1] options_rgb, int lookahead):
cdef int x_res = screen.X_RES
@ -136,7 +136,7 @@ cdef dither_lookahead(Dither* dither,
b = <long>clip(lah_image_rgb[i * lah_shape1 * lah_shape2 + j * lah_shape2 + 2], 0, 255)
flat = (r << 16) + (g << 8) + b
bit4 = options_4bit[i, j]
bit4 = options_nbit[i, j]
dist = distances[flat, bit4]
total_error += dist ** 2
if total_error >= best_error:
@ -145,7 +145,7 @@ cdef dither_lookahead(Dither* dither,
best_error = total_error
best = i
free(lah_image_rgb)
return options_4bit[best, 0], options_rgb[best, 0, :]
return options_nbit[best, 0], options_rgb[best, 0, :]
cdef void apply_one_line(Dither* dither, int xl, int xr, int x, float[] image, int image_shape1, float[] quant_error):
@ -181,28 +181,28 @@ cdef apply(Dither* dither, screen, int x, int y, Image* image, float[] quant_err
@cython.boundscheck(False)
@cython.wraparound(False)
cdef find_nearest_colour(screen, float[3] pixel_rgb, unsigned char[::1] options_4bit, unsigned char[:, ::1] options_rgb):
cdef find_nearest_colour(screen, float[3] pixel_rgb, unsigned char[::1] options_nbit, unsigned char[:, ::1] options_rgb):
cdef int best, dist, i
cdef unsigned char bit4
cdef int best_dist = 2**8
cdef long flat
cdef (unsigned char)[:, ::1] distances = screen.palette.distances
for i in range(options_4bit.shape[0]):
for i in range(options_nbit.shape[0]):
flat = (<long>pixel_rgb[0] << 16) + (<long>pixel_rgb[1] << 8) + <long>pixel_rgb[2]
bit4 = options_4bit[i]
bit4 = options_nbit[i]
dist = distances[flat, bit4]
if dist < best_dist:
best_dist = dist
best = i
return options_4bit[best], options_rgb[best, :]
return options_nbit[best], options_rgb[best, :]
@cython.boundscheck(False)
@cython.wraparound(False)
def dither_image(screen, float[:, :, ::1] image_rgb, dither, int lookahead):
cdef (unsigned char)[:, ::1] image_4bit = np.empty(
cdef (unsigned char)[:, ::1] image_nbit = np.empty(
(image_rgb.shape[0], image_rgb.shape[1]), dtype=np.uint8)
cdef int yres = screen.Y_RES
@ -210,9 +210,9 @@ def dither_image(screen, float[:, :, ::1] image_rgb, dither, int lookahead):
cdef int y, x, i
cdef float[3] quant_error
cdef (unsigned char)[:, ::1] options_4bit
cdef (unsigned char)[:, ::1] options_nbit
cdef float[:, :, ::1] options_rgb
cdef unsigned char output_pixel_4bit
cdef unsigned char output_pixel_nbit
cdef float[3] input_pixel_rgb
# Flatten python image array for more efficient access
@ -240,28 +240,28 @@ def dither_image(screen, float[:, :, ::1] image_rgb, dither, int lookahead):
cdither.pattern[i * cdither.x_shape + j] = dither.PATTERN[i, j, 0]
for y in range(yres):
output_pixel_4bit = 0
output_pixel_nbit = 0
for x in range(xres):
for i in range(3):
input_pixel_rgb[i] = cimage_rgb.flat[
y * cimage_rgb.shape1 * cimage_rgb.shape2 + x * cimage_rgb.shape2 + i]
if lookahead:
palette_choices_4bit, palette_choices_rgb = lookahead_options(
screen, lookahead, output_pixel_4bit, x % 4)
output_pixel_4bit, output_pixel_rgb = \
palette_choices_nbit, palette_choices_rgb = lookahead_options(
screen, lookahead, output_pixel_nbit, x % 4)
output_pixel_nbit, output_pixel_rgb = \
dither_lookahead(
&cdither, screen, &cimage_rgb, x, y, palette_choices_4bit, palette_choices_rgb, lookahead)
&cdither, screen, &cimage_rgb, x, y, palette_choices_nbit, palette_choices_rgb, lookahead)
else:
palette_choices_4bit, palette_choices_rgb = screen.pixel_palette_options(output_pixel_4bit, x)
output_pixel_4bit, output_pixel_rgb = \
find_nearest_colour(screen, input_pixel_rgb, palette_choices_4bit, palette_choices_rgb)
palette_choices_nbit, palette_choices_rgb = screen.pixel_palette_options(output_pixel_nbit, x)
output_pixel_nbit, output_pixel_rgb = \
find_nearest_colour(screen, input_pixel_rgb, palette_choices_nbit, palette_choices_rgb)
for i in range(3):
quant_error[i] = input_pixel_rgb[i] - output_pixel_rgb[i]
image_4bit[y, x] = output_pixel_4bit
image_nbit[y, x] = output_pixel_nbit
apply(&cdither, screen, x, y, &cimage_rgb, quant_error)
for i in range(3):
image_rgb[y, x, i] = output_pixel_rgb[i]
free(cdither.pattern)
free(cimage_rgb.flat)
return image_4bit, np.array(image_rgb)
return image_nbit, np.array(image_rgb)