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Brad King authored
ENH: Removing inclusion of windows.h by top VTK headers. This results in a substantial compile time reduction (~70%) on Windows compilers. It also avoids forcing windows name mangling on user code. Preprocessor work-arounds for this mangling has been added for VTK methods. A new vtkWindows.h has been created for VTK code that really needs the windows API. A vtkOpenGL.h has been created for VTK code that needs GL/gl.h because this header requires windows.h to be included first on some compilers. This addresses bug #836.
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