Bitmap rotation mechanism

摘要

A method is disclosed. The method includes allocating a decompressor for each scanline of an input image represented as compressed bitmap data, allocating tiles to store bitmap data representing a rotation of the image and generating a rotated output image represented as compressed bitmap data.

主权项

1. An article of manufacture comprising a computer-readable medium including instructions, which when executed by a processor, performs:
allocating a decompressor for each scanline of an input image represented as compressed bitmap data; allocating memory tiles to store bitmap data representing a rotation of the image; and generating a rotated output image represented as compressed bitmap data by:
filling each tile pel column with data from the input image by extracting a logical run corresponding to a minimum run length between a current run and a remaining vertical extent; andretrieving compressed bitmap data for each tile in a row to generate corresponding data by:
compiling a list of segments to merge similar tiles; andprocessing using the list of segments to produce the rotated out image.