Important: The information in this document is obsolete and should not be used for new development.
InvertRoundRectTo invert the pixels enclosed by a rounded rectangle, use the
PROCEDURE InvertRoundRect (r:\xDDRect; ovalWidth, ovalHeight: Integer);
- The rectangle that defines the rounded rectangle's boundaries.
- The width of the oval defining the rounded corner.
The height of the oval defining the rounded corner.
InvertRoundRectprocedure inverts the pixels enclosed by the rounded rectangle bounded by the rectangle that you specify in the
rparameter. Every white pixel becomes black and every black pixel becomes white. The
ovalHeightparameters specify the diameters of curvature for the corners. The pen location does not change.
InvertRoundRectprocedure was designed for 1-bit images in basic graphics ports. This procedure operates on color pixels in color graphics ports, but the results are predictable only with direct devices or 1-bit pixel maps. For indexed pixels, Color QuickDraw performs the inversion on the pixel indexes, which means the results depend entirely on the contents of the CLUT (which is described in the chapter "Color QuickDraw"). The eight colors used in basic QuickDraw are stored in a color table represented by the global variable
QDColors. To display those eight basic QuickDraw colors on an indexed device, Color QuickDraw uses the Color Manager to obtain indexes to the colors in the CLUT that best map to the colors in the
QDColorscolor table. Because the index, not the color value, is inverted, the results are unpredictable.
Inversion works better for direct pixels. Inverting a pure green, for example, that has red, green, and blue component values of $0000, $FFFF, and $0000 results in magenta, which has component values of $FFFF, $0000, and $FFFF.
InvertRoundRectprocedure may move or purge memory blocks in the application heap. Your application should not call this procedure at interrupt time.