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Peter de Rivaz authored
This change is made in preparation for a subsequent patch which adds acceleration for the highbitdepth transform functions. The highbitdepth transform functions attempt to use 16/32bit sse instructions where possible, but fallback to using the C implementations if potential overflow is detected. For this reason the dct routines are made global so they can be called from the acceleration functions in the subsequent patch. Change-Id: Ia921f191bf6936ccba4f13e8461624b120c1f665 (cherry picked from commit 454342d4e77dbb67f4a3c10f97a57a6fcb46d9a0)
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