opengl: Off-by-one in getPixel.
opengl: Off-by-one in getPixel.

Change-Id: I971d94c353adcdf70e0f251d6103b1e19042687c

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core