[FFmpeg-devel] [PATCH] swscale: Only copy dstW/chrDstW of the last line in the plane in planar copy

[Martin Storsjö]

On Fri, 16 Jul 2010, Martin Storsj? wrote:

> The attached patch makes planarCopyWrapper all lines but the last in one 
> block, then copies only dstW/chrDstW of the last line.
> 
> If the destination planes are offset within their buffer, copying the 
> whole plane in one memcpy may write outside of the destination buffer.
> 
> A concrete example: The source data is 144x144, stored in the upper left 
> corner of a 176x144 buffer. If this is "scaled" into 144x144 into another 
> 176x144 buffer, but centered into this buffer, the approach wich memcpying 
> the whole plane writes outside of the destination buffer.

Updated patch - uses the already existing length variable instead of 
recalculating it.

// Martin
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