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The current code to transform images uses an image processing library to do the work. For many common image types the image data must first be massaged into the correct format and data structures that are needed by the general-purpose image processing library. Also, since the library does not provide an operation which both transforms the data and also composites the results into a destination image, there is always at least one intermediate buffer created for each transform operation, possibly more if various image format conversions end up being necessary to communicate with the library's internal formats. It should be possible to create our own routines to perform the task of image transformation and blending/compositing it into a destination in one operation with no expensive intermediate buffers. Finally, the glue code that translates our internal image formats and data into the format needed by the library has been the source of many recent bugs and it has been difficult to maintain that code. Image transformation loops written specifically to our own internal data structures should not only perform better, but produce fewer bugs in the future.
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