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image_processor.py
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image_processor.py
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import string
from PIL import Image, ImageDraw
printable = set(string.printable)
GRAY = '#6B696A'
def concatenate_image(images, align='left'):
widths, heights = zip(*(i.size for i in images))
sum_height = sum(heights)
max_width = max(widths)
new_img = Image.new('RGB', (max_width, sum_height), color='white')
x_offset = 0
y_offset = 0
if 'left' == align:
for img in images:
new_img.paste(img, (0, y_offset))
y_offset += img.height
elif 'center' == align:
for img in images:
x_offset = int((max_width - img.width) / 2)
new_img.paste(img, (x_offset, y_offset))
y_offset += img.height
elif 'right' == align:
for img in images:
x_offset = max_width - img.width # 右对齐
new_img.paste(img, (x_offset, y_offset))
y_offset += img.height
return new_img
def padding_image(image, padding_size, padding_location='tb'):
if image is None:
return None
total_width, total_height = image.size
x_offset, y_offset = 0, 0
if 't' in padding_location:
total_height += padding_size
y_offset += padding_size
if 'b' in padding_location:
total_height += padding_size
if 'l' in padding_location:
total_width += padding_size
x_offset += padding_size
if 'r' in padding_location:
total_width += padding_size
padding_img = Image.new('RGB', (total_width, total_height), color='white')
padding_img.paste(image, (x_offset, y_offset))
return padding_img
def square_image(image):
# 计算图片的宽度和高度
width, height = image.size
# 计算需要填充的白色区域大小
delta_w = abs(width - height)
padding = (delta_w // 2, 0) if width < height else (0, delta_w // 2)
# 创建新的正方形画布
square_size = max(width, height)
square_img = Image.new('RGB', (square_size, square_size), color='white')
# 将输入的图片粘贴到正方形画布的中心位置
square_img.paste(image, padding)
# 返回正方形图片对象
return square_img
def resize_image_with_height(image, height):
# 获取原始图片的宽度和高度
width, old_height = image.size
# 计算缩放后的宽度
scale = height / old_height
new_width = round(width * scale)
# 进行等比缩放
resized_image = image.resize((new_width, height), Image.ANTIALIAS)
# 返回缩放后的图片对象
return resized_image
def resize_image_with_width(image, width):
# 获取原始图片的宽度和高度
old_width, height = image.size
# 计算缩放后的宽度
scale = width / old_width
new_height = round(height * scale)
# 进行等比缩放
resized_image = image.resize((width, new_height), Image.ANTIALIAS)
# 返回缩放后的图片对象
return resized_image
def append_image_by_side(background, images, side='left', padding=200, is_start=False):
"""
横向拼接图片
:param background:
:param images:
:param side:
:param padding:
:param is_start:
:return:
"""
if 'right' == side:
if is_start:
x_offset = background.width - padding
else:
x_offset = background.width
images.reverse()
for i in images:
if i is None:
continue
i = resize_image_with_height(i, background.height)
y_offset = int((background.height - i.height) / 2)
x_offset -= i.width
x_offset -= padding
background.paste(i, (x_offset, y_offset))
else:
if is_start:
x_offset = padding
else:
x_offset = 0
for i in images:
if i is None:
continue
i = resize_image_with_height(i, background.height)
y_offset = int((background.height - i.height) / 2)
background.paste(i, (x_offset, y_offset))
x_offset += i.width
x_offset += padding
class ImageProcessor(object):
def __init__(self, font, bold_font):
self.font = font
self.bold_font = bold_font
def text_to_image(self, content, is_bold=False, fill='black'):
"""
将文字内容转换为图片
:param content:
:param is_bold:
:param fill:
:return:
"""
if content == '':
content = ' '
font = self.bold_font if is_bold else self.font
text_width, text_height = font.getsize(content)
image = Image.new('RGB', (text_width, text_height), color='white')
draw = ImageDraw.Draw(image)
draw.text((0, 0), content, fill=fill, font=font)
return image
def normal_watermark(self, container, config, is_logo_left=True):
"""
生成一个默认布局的水印图片
:param container:
:param config:
:param is_logo_left:
:return:
"""
ratio = .13
padding_ratio = .5
if container.ratio > 1:
ratio = .1
padding_ratio = .5
watermark = Image.new('RGB', (int(1000 / ratio), 1000), color='white')
# 填充左边的文字内容
left_top = self.text_to_image(container.get_attribute_str(config.left_top), is_bold=config.left_top.is_bold)
left_bottom = self.text_to_image(container.get_attribute_str(config.left_bottom), is_bold=config.left_bottom.is_bold,
fill=GRAY)
left = concatenate_image([left_top, left_bottom])
left = padding_image(left, int(padding_ratio * left.height))
# 填充右边的文字内容
right_top = self.text_to_image(container.get_attribute_str(config.right_top), is_bold=config.right_top.is_bold)
right_bottom = self.text_to_image(container.get_attribute_str(config.right_bottom), is_bold=config.right_bottom.is_bold,
fill=GRAY)
right = concatenate_image([right_top, right_bottom])
right = padding_image(right, int(padding_ratio * right.height))
logo = container.get_logo()
if is_logo_left:
# 如果 logo 在左边
append_image_by_side(watermark, [logo, left], is_start=logo is None)
append_image_by_side(watermark, [right], side='right')
else:
# 如果 logo 在右边
if logo is not None:
# 如果 logo 不为空,等比例缩小 logo
logo = padding_image(logo, int(padding_ratio * logo.height))
# 插入一根线条用于分割 logo 和文字
line = Image.new('RGB', (20, 1000), color=GRAY)
line = padding_image(line, int(padding_ratio * line.height * .8))
append_image_by_side(watermark, [left], is_start=True)
append_image_by_side(watermark, [logo, line, right], side='right')
watermark = resize_image_with_width(watermark, container.width)
image = Image.new('RGB', (container.width, container.height + watermark.height), color='white')
image.paste(container.img)
image.paste(watermark, (0, container.height))
return image
def square_watermark(self, container):
"""
生成一个1:1布局的水印图片
:param container:
:param config:
:param is_logo_left:
:return:
"""
return square_image(container.img)