some recommendations for your code
as I understand you could already know this things

loops

You could use iterating instead of range(len(obj)) expression.

    for line in lines:
        thisChunk.append(line)
        count += 1
        if count == lines_high:
            count = 0
            chunks.append(thisChunk)
            thisChunk = []

And it looks more readable

If you need i in this situation I think it will be better to use enumerate function:

    for i, _ in enumerate(lines):
        thisChunk.append(lines[i])
        count += 1
        if count == lines_high:
            count = 0
            chunks.append(thisChunk)
            thisChunk = []

It is just an example. I think the code above is bad because you could just iterate object.

As you code in Python it is not necessary write brackets near the expression:

    while total_moved_abs < abs_dx: 

functions

If you are in situation when every condition must have True value you can use all function or
any if at least one value have True.

    return all(x1 < x2 + w2, 
               x1 + w1 > x2,
               y1 < y2 + h2,
               y1 + h1 > y2)

sorry for my English