46 lines
1.5 KiB
Bash
46 lines
1.5 KiB
Bash
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#!/bin/bash
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# Input parameters
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input_image="$1" # Input tilemap image
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output_image="$2" # Output image with transparent pixels
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tile_width="$3" # Width of each tile
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tile_height="$4" # Height of each tile
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# Get the dimensions of the input image
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image_width=$(identify -format "%w" "$input_image")
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image_height=$(identify -format "%h" "$input_image")
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# Calculate the number of tiles in both directions
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tiles_across=$((image_width / tile_width))
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tiles_down=$((image_height / tile_height))
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# New image size (considering the 1 pixel padding between tiles)
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new_width=$((tiles_across * (tile_width + 1) - 1))
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new_height=$((tiles_down * (tile_height + 1) - 1))
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# Create a blank canvas with a transparent background
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convert -size "${new_width}x${new_height}" xc:none blank_canvas.png
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# Iterate through each tile in the tilemap
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for ((y = 0; y < tiles_down; y++)); do
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for ((x = 0; x < tiles_across; x++)); do
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# Extract the tile from the original image
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tile_x=$((x * tile_width))
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tile_y=$((y * tile_height))
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convert "$input_image" -crop "${tile_width}x${tile_height}+$tile_x+$tile_y" "tile_${x}_${y}.png"
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# Place the tile on the new image, accounting for the 1-pixel padding
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new_tile_x=$((x * (tile_width + 1)))
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new_tile_y=$((y * (tile_height + 1)))
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composite -geometry "+${new_tile_x}+${new_tile_y}" "tile_${x}_${y}.png" blank_canvas.png blank_canvas.png
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done
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done
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# Save the final image
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mv blank_canvas.png "$output_image"
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# Clean up temporary tiles
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rm tile_*.png
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echo "Output saved to $output_image"
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