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dotCooCoo
db10eaf115
The runs of transparent and left-out pixels that the first round checks holes against were kept in a list for each row. A tall, narrow image paid a list header for every row: 1.1 MB for a 3 x 20,000 pixel image with two runs. The runs are now one list over the whole image, so they take at most four bytes a pixel, as the half-gigabyte bound counts them.