weekly_images.py 文件源码

def _generate_image(event):
    image_data = event_image.get_image(event)
    im = Image.open(StringIO.StringIO(image_data))
    image_size = (im.width, im.height)
    scale = tuple(1.0 * x / y for x, y in zip(full_size, image_size))

    # Generate the background-image that is blurred and backgrounds the main image
    max_scale = max(scale)
    background_image_new_size = tuple(int(round(max_scale * x)) for x in image_size)
    background_resized = im.resize(background_image_new_size, resample=Image.BICUBIC)
    background_blurred = background_resized.filter(ImageFilter.GaussianBlur(100))
    background_offset = tuple((x - y) / 2 for x, y in zip(full_size, background_image_new_size))

    # Generate the scaled-image that fits the frame exactly
    min_scale = min(scale)
    foreground_image_size = tuple(int(round(min_scale * x)) for x in image_size)
    foreground_resized = im.resize(foreground_image_size, resample=Image.BICUBIC)
    foreground_offset = tuple((x - y) / 2 for x, y in zip(full_size, foreground_image_size))

    target = Image.new('RGB', full_size)
    target.paste(background_blurred, background_offset)
    target.paste(foreground_resized, foreground_offset)

    return target