added brail and animated gif support

modules/ascii.py

@@ -16,6 +16,7 @@ import module
 from tools import web
 
 ASCII_CHARS = "$@%#*+=-:. "
+BRAIL_CHARS = "⠿⠾⠼⠸⠰⠠ "
 HEADERS = {'User-Agent': 'Gimme the ascii.'}
 
 
@@ -48,21 +49,22 @@ def scale_image(image, size=(100,100)):
 	return image
 
 
-def pixels_to_chars(image, reverse=False):
+def pixels_to_chars(image, scale="ascii"):
 	"""
 	Maps each pixel to an ascii char based on where it falls in the range
 	0-255 normalized to the length of ASCII_CHARS.
 	"""
-	range_width = int(255 / len(ASCII_CHARS)) + (255 % len(ASCII_CHARS) > 0)
+	scales = {"ascii": ASCII_CHARS,
+		"ascii_reverse": "".join(list(reversed(ASCII_CHARS))),
+		"brail": BRAIL_CHARS,
+		"brail_reverse": "".join(list(reversed(BRAIL_CHARS)))}
+	range_width = int(255 / len(scales[scale])) + (255 % len(scales[scale]) > 0)
 
 	pixels = list(image.getdata())
 	chars = []
 	for pixel in pixels:
-		if reverse:
-			index = -int(pixel/range_width)-1
-		else:
 		index = int(pixel/range_width)
-		chars.append(ASCII_CHARS[index])
+		chars.append(scales[scale][index])
 
 	chars = "".join(chars)
 	chars = [chars[i:i + image.size[0]] for i in range(0, len(chars),
@@ -149,16 +151,71 @@ def colorize(chars, image, code):
 	return "\n".join(chars)
 
 
-def image_to_ascii(image, reverse=False, colors=None):
+def alpha_composite(front, back):
+	"""Alpha composite two RGBA images.
+
+	Source: http://stackoverflow.com/a/9166671/284318
+
+	Keyword Arguments:
+	front -- PIL RGBA Image object
+	back -- PIL RGBA Image object
+
+	"""
+	front = np.asarray(front)
+	back = np.asarray(back)
+	result = np.empty(front.shape, dtype='float')
+	alpha = np.index_exp[:, :, 3:]
+	rgb = np.index_exp[:, :, :3]
+	falpha = front[alpha] / 255.0
+	balpha = back[alpha] / 255.0
+	result[alpha] = falpha + balpha * (1 - falpha)
+	old_setting = np.seterr(invalid='ignore')
+	result[rgb] = (front[rgb] * falpha + back[rgb] * balpha * (1 - falpha)) / result[alpha]
+	np.seterr(**old_setting)
+	result[alpha] *= 255
+	np.clip(result, 0, 255)
+	# astype('uint8') maps np.nan and np.inf to 0
+	result = result.astype('uint8')
+	result = Image.fromarray(result, 'RGBA')
+	return result
+
+
+def alpha_composite_with_color(image, color=(255, 255, 255)):
+	"""Alpha composite an RGBA image with a single color image of the
+	specified color and the same size as the original image.
+
+	Keyword Arguments:
+	image -- PIL RGBA Image object
+	color -- Tuple r, g, b (default 255, 255, 255)
+
+	"""
+	back = Image.new('RGBA', size=image.size, color=color + (255,))
+	return alpha_composite(image, back)
+
+
+def image_to_ascii(image, reverse=False, colors=None, brail=False):
 	"""
 	Reads an image file and converts it to ascii art. Returns a
 	newline-delineated string. If reverse is True, the ascii scale is
 	reversed.
 	"""
+	if image.mode == "RGBA":
+		image = alpha_composite_with_color(image).convert("RGB")
+
 	image = scale_image(image)
 	image_grey = image.convert('L')	# convert to grayscale
 
-	chars = pixels_to_chars(image_grey, reverse)
+	if reverse:
+		if brail:
+			scale = "brail_reverse"
+		else:
+			scale = "ascii_reverse"
+	else:
+		if brail:
+			scale = "brail"
+		else:
+			scale = "ascii"
+	chars = pixels_to_chars(image_grey, scale)
 
 	if colors:
 		chars = colorize(chars, image, colors)
@@ -188,7 +245,7 @@ def handle_gif(image, output, reverse=False):
 	"""
 	Handle gifs seperately.
 	"""
-	image = open_image(args.imagePath)
+	# image = open_image(args.imagePath)
 	ascii_seq = []
 	new_image = ascii_to_image(image_to_ascii(image, reverse))
 	image.seek(1)
@@ -216,11 +273,14 @@ def ascii(bot, trigger):
 	"""
 	Downloads an image and converts it to ascii.
 	"""
+	if not trigger.group(2):
+		return bot.say()
 	parser = argparse.ArgumentParser()
 	parser.add_argument("imagePath")
 	parser.add_argument("-r", "--reverse", action="store_true")
 	parser.add_argument("-c", "--color", action="store_true")
-	parser.set_defaults(reverse=False, color=False)
+	parser.add_argument("-b", "--brail", action="store_true")
+	parser.add_argument("-a", "--animated", action="store_true")
 	args = parser.parse_args(trigger.group(2).split())
 
 	if args.color:
@@ -234,7 +294,14 @@ def ascii(bot, trigger):
 		return
 
 	image = open_image(args.imagePath)
-	image_ascii = image_to_ascii(image, args.reverse, args.color)
+	if args.animated:
+		handle_gif(image, "temp.png", args.reverse)
+		file = {"file": open("temp.png", "rb")}
+		res = requests.post("https://uguu.se/api.php?d=upload-tool", files=file)
+		# print(res.text)
+		bot.say(res.text)
+	else:
+		image_ascii = image_to_ascii(image, args.reverse, args.color, args.brail)
 		bot.say(image_ascii)