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The HeaderExtension1 object defines the first extension to the EMF metafile header. It adds support for a PixelFormatDescriptor object (section 2.2.22) and OpenGL [OPENGL] records (section 2.3.9).
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cbPixelFormat |
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offPixelFormat |
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bOpenGL |
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cbPixelFormat (4 bytes): An unsigned integer that specifies the size of the PixelFormatDescriptor object. This value is 0x00000000 if no pixel format is set.
offPixelFormat (4 bytes): An unsigned integer that specifies the offset to the PixelFormatDescriptor object. This value is 0x00000000 if no pixel format is set.
bOpenGL (4 bytes): An unsigned integer that indicates whether OpenGL commands are present in the metafile.
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Value
Meaning
0x00000000
OpenGL records are not present in the metafile.
0x00000001
OpenGL records are present in the metafile.