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Thomas Bonfort authored
The existing implementation falls back to using image.At() for each pixel when encoding an *image.YCbCr which is inefficient and causes many memory allocations. This change makes the jpeg encoder directly read Y, Cb, and Cr pixel values. benchmark old ns/op new ns/op delta BenchmarkEncodeYCbCr-4 43990846 24201148 -44.99% benchmark old MB/s new MB/s speedup BenchmarkEncodeYCbCr-4 20.95 38.08 1.82x Fixes #18487 Change-Id: Iaf2ebc646997e3e1fffa5335f1b0d642e15bd453 Reviewed-on: https://go-review.googlesource.com/34773 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
Nigel Tao <nigeltao@golang.org>
435450bf
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huffman.go | ||
idct.go | ||
reader.go | ||
reader_test.go | ||
scan.go | ||
writer.go | ||
writer_test.go |