SETUP_BLITTER Field - fInvert

fInvert (BOOL)

Enables output image to be inverted, or rotated, by 180 degrees. The image is vertically inverted if bit 0 is set and horizontally inverted if bit 1 is set. Inverting the image in this manner is independent of the global configuration for horizontally or vertically inverting the image and independent of the coordinate system interpretation for rotated image display.

Normally a BOOL data type is used to contain a TRUE or FALSE value. However, because the BOOL data type is defined as:

typdef unsigned long BOOL;

it is not limited to containing only TRUE and FALSE. Therefore, in order to maintain compatibility in this instance, the BOOL field can contain more than one bit flag, without changing the data type of the fInvert field in the data structure.

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