windows opengl: Explain the concept of the text drawing + minor fixes.
windows opengl: Explain the concept of the text drawing + minor fixes.

Change-Id: I4651e7e9b8163844be548d4ed975a881d4f83fff

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