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What language are you using? In Python, Pygame can do this for you. Use the RenderUpdates Group and some Sprite objects with image and rect attributes. For example: <pre><code>#!/usr/bin/env python import pygame class DirtyRectSprite(pygame.sprite.Sprite): """Sprite with image and rect attributes.""" def __init__(self, some_image, *groups): pygame.sprite.Sprite.__init__(self, *groups) self.image = pygame.image.load(some_image).convert() self.rect = self.image.get_rect() def update(self): pass #do something here def main(): screen = pygame.display.set_mode((640, 480)) background = pygame.image.load(open("some_bg_image.png")).convert() render_group = pygame.sprite.RenderUpdates() dirty_rect_sprite = DirtyRectSprite(open("some_image.png")) render_group.add(dirty_rect_sprite) while True: dirty_rect_sprite.update() render_group.clear(screen, background) pygame.display.update(render_group.draw(screen)) </code></pre> If you're not using Python+Pygame, here's what I would do: <ul> <li>Make a Sprite class that's update(), move() etc. method sets a "dirty" flag.</li> <li>Keep a rect for each sprite</li> <li>If your API supports updating a list of rects, use that on the list of rects whose sprites are dirty. In SDL, this is SDL_UpdateRects.</li> <li>If your API doesn't support updating a list of rects (I've never had the chance to use anything besides SDL so I wouldn't know), test to see if it's quicker to call the blit function multiple times or once with a big rect. I doubt that any API would be faster using one big rect, but again, I haven't used anything besides SDL.</li> </ul>
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