Takes a tileset image with possible spacing and offsets, and realigns it to a proper grid

pygame-realign-tiles.py

import pygame
import sys
from pygame.locals import *


TILE_PIXELS = 8
tileGroups = [
	{ "x": 1, 	"y": 11, "tilesW": 16, "tilesH": 16, "offset": 0 },
	{ "x": 130, "y": 11, "tilesW": 16, "tilesH": 16, "offset": 0  },
	{ "x": 259, "y": 11, "tilesW": 16, "tilesH": 16, "offset": 0  },
	{ "x": 388, "y": 11, "tilesW": 16, "tilesH": 16, "offset": 0  },
]
TILE_SIZE = TILE_PIXELS, TILE_PIXELS

inputFilename = "zelda_overworld.png"
outputFilename = "zelda_overworld_aligned.png"

pygame.init()

screen = pygame.display.set_mode([100, 100])
inputSurface = pygame.image.load(inputFilename).convert()

outputWidth = 0
outputHeight = 0

for tile in tileGroups:
	w = tile["tilesW"] * TILE_PIXELS
	h = tile["tilesH"] * TILE_PIXELS

	outputWidth += w
	outputHeight = max(outputHeight, h)

print("Input size: %dx%d" % inputSurface.get_size())
print("Output size: %dx%d" % (outputWidth, outputHeight))

outputSurface = pygame.Surface((outputWidth, outputHeight), inputSurface.get_flags(), inputSurface)


outputTileIndex = 0
outX = 0
for tile in tileGroups:
	outY = 0
	inputBaseX = tile["x"]
	inputBaseY = tile["y"]
	w = tile["tilesW"]
	h = tile["tilesH"]
	pixelWidth = w * TILE_PIXELS
	for y in range(h):
		for x in range(w):
			left = inputBaseX + (x * TILE_PIXELS)
			top = inputBaseY + (y * TILE_PIXELS)
			source = inputSurface.subsurface(Rect((left, top), TILE_SIZE))
			outputBaseX = outputTileIndex * pixelWidth
			dest = Rect(outputBaseX + (x * TILE_PIXELS), outY, TILE_PIXELS, TILE_PIXELS)

			outputSurface.blit(source, dest)
		outY += TILE_PIXELS
	outX += pixelWidth
	outputTileIndex += 1

pygame.image.save(outputSurface, outputFilename)