dynamic-resizing

I need to resize and crop an image to a specific width and height. I was able to construct a method that will create a square thumbnail, but I'm unsure on how to apply this, when the desired thumbnail is not square. def rescale(data, width, height): """Rescale the given image, optionally cropping it to make sure the result image has the specified width and height.""" from google.appengine.api import images new_width = width new_height = height img = images.Image(data) org_width, org_height = img.width, img.height # We must determine if the image is portrait or landscape # Landscape if org

I'm pretty new to C++, but I know you can't just use memory willy nilly like the std::string class seems to let you do. For instance: std::string f = "asdf"; f += "fdsa"; How does the string class handle getting larger and smaller? I assume it allocates a default amount of memory and if it needs more, it new s a larger block of memory and copies itself over to that. But wouldn't that be pretty inefficient to have to copy the whole string every time it needed to resize? I can't really think of another way it could be done (but obviously somebody did). And for that matter, how do all the stdlib