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XGetSubImage: improve efficiency by reducing number of temporary heap allocations

qneko requested to merge qkot/libx11:master into master

Fixes #114

The previous implementation of XGetSubImage put the result of XGetImage in a temporary image for the sole purpose of copying its data over to dest_image. This is very slow and with these changes, X11 will directly copy from the X server to the dest_image->data buffer as long as the formats match.

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