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When the GL_EXT_unpack_subimage extension is not available and a subregion of a texture is uploaded then it should first copy the subregion to a newly allocated bitmap. However it was then later still trying to prepare the upload using the original src_x and src_y values which would cause an assertion failure. This patch fixes it to just reset those to zero if the subregion is first copied. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 6f9a62db6f846f1d76e3ca16d9d8cdadf82a7009)