2.3.11.24 EMR_SETSTRETCHBLTMODE Record
The EMR_SETSTRETCHBLTMODE record specifies bitmap stretch mode.
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Type (4 bytes): An unsigned integer that identifies this record type as EMR_SETSTRETCHBLTMODE. This value is 0x00000015.
Size (4 bytes): An unsigned integer that specifies the size of this record in bytes.
StretchMode (4 bytes): An unsigned integer that specifies the stretch mode and MAY be in the StretchMode enumeration.
The stretching mode specifies how to combine rows or columns of a bitmap with existing pixels on the display device that the EMR_STRETCHBLT record is processed on.
The STRETCH_ANDSCANS and STRETCH_ORSCANS modes are typically used to preserve foreground pixels in monochrome bitmaps. The STRETCH_DELETESCANS mode is typically used to preserve color in color bitmaps.
The STRETCH_HALFTONE mode is slower and requires more processing of the source image than the other three modes, but produces higher quality images. Also note that an EMR_SETBRUSHORGEX SHOULD be encountered after setting the STRETCH_HALFTONE mode to avoid brush misalignment.
See section 2.3.11 for more state record types.