"""
    Rendering images as thumbnails/previews.
"""

import PIL.Image

import os.path

class RenderMachine (object) :
    """
        RAWR! I'm the render machine!

        TODO: use multithreaded rendering (PIL supports it)
    """

    def __init__ (self, config) :
        """
            Use the given Configuration object's settings for rendering
        """

        self.config = config

    def render_out (self, img, size, out_path) :
        """
            Creates a thumbnail from the given PIL.Image of the given size, and saves it at out_path.
        """

        # we need to create a copy, as .thumbnail mutates the Image
        img_out = img.copy()

        # then resample to given size
        img_out.thumbnail(size, resample=True)

        # and write out
        img_out.save(out_path)

    def render_img (self, img, dirname, filename) :
        """
            Renders new thumbnails/previews from the given loaded image and filename based on the current configuration.
            
            Note: this does not check for the existance of the thumbs/previews subdirs!
        """

        # once for each size
        for subdir, size in (
            (self.config.thumb_dir, self.config.thumb_size),
            (self.config.preview_dir, self.config.preview_size)
        ) :
            # resize and write out
            self.render_out(img, size, os.path.join(dirname, subdir, filename)