Fixed 3D image copy
Fixed 3D image copy

3D subregions were not properly supported in Image::copyTo()

Bug: b/144353295
Change-Id: I445881b37be310401b38cffcb6003a1e4461bed8
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38471
Presubmit-Ready: Alexis Hétu <1c7141772178a7e80858c3db5052b328076f08f4@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Tested-by: Alexis Hétu <1c7141772178a7e80858c3db5052b328076f08f4@google.com>
Reviewed-by: Antonio Maiorano <86d87a6550afb6b07035c9743fa181900589f7e0@google.com>

bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader