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import os |
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import hashlib |
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from contextlib import suppress |
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from PIL import Image as ImageFile, ImageFont, ImageDraw, ImageFilter |
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import log |
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class Image(object): |
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"""JPEG generated by applying text to a template.""" |
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def __init__(self, template, text, root=None, |
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style=None, font=None, size=None, |
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watermark="", watermark_font=None): |
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self.root = root |
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self.template = template |
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self.style = style |
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self.text = text |
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self.font = font |
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self.width = size.get('width') if size else None |
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self.height = size.get('height') if size else None |
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self.watermark = watermark |
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self.watermark_font = watermark_font |
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@property |
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def path(self): |
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if not self.root: |
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return None |
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base = os.path.join(self.root, self.template.key, self.text.path) |
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custom = [self.style, self.font, self.watermark, |
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self.width, self.height] |
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if any(custom): |
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slug = self.hash(custom) |
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return "{}#{}.img".format(base, slug) |
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else: |
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return base + ".img" |
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@staticmethod |
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def hash(values): |
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sha = hashlib.md5() |
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for index, value in enumerate(values): |
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sha.update("{}:{}".format(index, value or "").encode('utf-8')) |
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return sha.hexdigest() |
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def save(self): |
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data = _generate( |
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top=self.text.top, bottom=self.text.bottom, |
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font_path=self.font.path, |
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background=self.template.get_path(self.style), |
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width=self.width, height=self.height, |
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watermark=self.watermark, |
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watermark_font_path=self.watermark_font.path, |
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) |
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directory = os.path.dirname(self.path) |
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with suppress(FileExistsError): |
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os.makedirs(directory) |
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log.info("Saving image: %s", self.path) |
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path = data.save(self.path, format=data.format) |
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return path |
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def _generate(top, bottom, font_path, background, width, height, |
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watermark, watermark_font_path): |
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"""Add text to an image and save it.""" |
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log.info("Loading background: %s", background) |
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background_image = ImageFile.open(background) |
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if background_image.mode not in ('RGB', 'RGBA'): |
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if background_image.format == 'JPEG': |
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background_image = background_image.convert('RGB') |
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background_image.format = 'JPEG' |
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else: |
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background_image = background_image.convert('RGBA') |
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background_image.format = 'PNG' |
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# Resize to a maximum height and width |
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ratio = background_image.size[0] / background_image.size[1] |
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pad_image = bool(width and height) |
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pad_watermark = True |
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if pad_image: |
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if width < height * ratio: |
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dimensions = width, int(width / ratio) |
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pad_watermark = False |
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else: |
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dimensions = int(height * ratio), height |
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elif width: |
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dimensions = width, int(width / ratio) |
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elif height: |
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dimensions = int(height * ratio), height |
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else: |
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dimensions = 600, int(600 / ratio) |
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image = background_image.resize(dimensions, ImageFile.LANCZOS) |
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image.format = 'PNG' |
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# Draw image |
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draw = ImageDraw.Draw(image) |
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max_font_size = int(image.size[1] / 9) |
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min_font_size_single_line = int(image.size[1] / 12) |
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max_text_len = image.size[0] - 20 |
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top_font_size, top = _optimize_font_size( |
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font_path, top, max_font_size, |
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min_font_size_single_line, max_text_len, |
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) |
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bottom_font_size, bottom = _optimize_font_size( |
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font_path, bottom, max_font_size, |
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min_font_size_single_line, max_text_len, |
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) |
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top_font = ImageFont.truetype(font_path, top_font_size) |
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bottom_font = ImageFont.truetype(font_path, bottom_font_size) |
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top_text_size = draw.multiline_textsize(top, top_font) |
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bottom_text_size = draw.multiline_textsize(bottom, bottom_font) |
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# Find top centered position for top text |
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top_text_pos_x = (image.size[0] / 2) - (top_text_size[0] / 2) |
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top_text_pos_y = 0 |
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top_text_pos = (top_text_pos_x, top_text_pos_y) |
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# Find bottom centered position for bottom text |
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bottom_text_size_x = (image.size[0] / 2) - (bottom_text_size[0] / 2) |
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bottom_text_size_y = image.size[1] - bottom_text_size[1] * (7 / 6) |
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if watermark and pad_watermark: |
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bottom_text_size_y = bottom_text_size_y - 5 |
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bottom_text_pos = (bottom_text_size_x, bottom_text_size_y) |
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outline = int(round(max(1, min(dimensions) / 300))) |
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t_outline = min(outline, top_font_size // 20) |
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b_outline = min(outline, bottom_font_size // 20) |
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_draw_outlined_text(image, top_text_pos, top, top_font, t_outline) |
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_draw_outlined_text(image, bottom_text_pos, bottom, bottom_font, b_outline) |
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# Pad image if a specific dimension is requested |
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if pad_image: |
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image = _add_blurred_background(image, background_image, width, height) |
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# Add watermark |
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if watermark: |
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watermark_font = ImageFont.truetype(watermark_font_path, 11) |
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watermark_pos = (3, image.size[1] - 15) |
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_draw_outlined_text(image, watermark_pos, watermark, watermark_font, |
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alpha=True) |
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return image |
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def _optimize_font_size(font, text, max_font_size, min_font_size, |
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max_text_len): |
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"""Calculate the optimal font size to fit text in a given size.""" |
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# Check size when using smallest single line font size |
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fontobj = ImageFont.truetype(font, min_font_size) |
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text_size = fontobj.getsize(text) |
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# Calculate font size for text, split if necessary |
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if text_size[0] > max_text_len: |
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phrases = _split(text) |
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else: |
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phrases = (text,) |
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font_size = max_font_size |
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for phrase in phrases: |
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font_size = min(_maximize_font_size(font, phrase, max_text_len), |
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font_size) |
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# Rebuild text with new lines |
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text = '\n'.join(phrases) |
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return font_size, text |
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def _draw_outlined_text(image, text_pos, text, font, width=1, alpha=False): |
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"""Draw white text with black outline on an image.""" |
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if alpha: |
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black_alpha = 170 |
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white_alpha = 128 |
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else: |
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black_alpha = 255 |
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white_alpha = 240 |
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overlay = ImageFile.new('RGBA', image.size) |
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draw = ImageDraw.ImageDraw(overlay, 'RGBA') |
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# Draw black text outlines |
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for x in range(-width, 1 + width): |
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for y in range(-width, 1 + width): |
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pos = (text_pos[0] + x, text_pos[1] + y) |
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draw.multiline_text(pos, text, (0, 0, 0, black_alpha), |
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font=font, align='center') |
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# Draw inner white text |
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draw.multiline_text(text_pos, text, (255, 255, 255, white_alpha), |
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font=font, align='center') |
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image.paste(overlay, None, overlay) |
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def _add_blurred_background(foreground, background, width, height): |
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"""Add a blurred background to match the requested dimensions.""" |
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base_width, base_height = foreground.size |
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border_width = min(width, base_width + 2) |
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border_height = min(height, base_height + 2) |
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border_dimensions = border_width, border_height |
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border = ImageFile.new('RGB', border_dimensions) |
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border.paste(foreground, ((border_width - base_width) // 2, |
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(border_height - base_height) // 2)) |
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padded_dimensions = (width, height) |
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padded = background.resize(padded_dimensions, ImageFile.LANCZOS) |
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darkened = padded.point(lambda p: p * 0.4) |
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blurred = darkened.filter(ImageFilter.GaussianBlur(5)) |
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blurred.format = 'PNG' |
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blurred_width, blurred_height = blurred.size |
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offset = ((blurred_width - border_width) // 2, |
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(blurred_height - border_height) // 2) |
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blurred.paste(border, offset) |
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return blurred |
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def _maximize_font_size(font, text, max_size): |
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"""Find the biggest font size that will fit.""" |
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font_size = max_size |
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fontobj = ImageFont.truetype(font, font_size) |
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text_size = fontobj.getsize(text) |
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while text_size[0] > max_size and font_size > 1: |
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font_size = font_size - 1 |
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fontobj = ImageFont.truetype(font, font_size) |
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text_size = fontobj.getsize(text) |
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240
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return font_size |
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def _split(text): |
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"""Split a line of text into two similarly sized pieces. |
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>>> _split("Hello, world!") |
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('Hello,', 'world!') |
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>>> _split("This is a phrase that can be split.") |
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('This is a phrase', 'that can be split.') |
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>>> _split("This_is_a_phrase_that_can_not_be_split.") |
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('This_is_a_phrase_that_can_not_be_split.',) |
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255
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""" |
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result = (text,) |
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if len(text) >= 3 and ' ' in text[1:-1]: # can split this string |
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space_indices = [i for i in range(len(text)) if text[i] == ' '] |
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space_proximities = [abs(i - len(text) // 2) for i in space_indices] |
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for i, j in zip(space_proximities, space_indices): |
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if i == min(space_proximities): |
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result = (text[:j], text[j + 1:]) |
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break |
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return result |
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jacebrowning /
memegen
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