only works with bitmaps where PixelFormat := pf8bit;
procedure InvertCursorBitMapColours;
const
increment = 64;
var
//row: array of byte;
row: PByteArray;
i, j: Integer;
redValue: Integer;
greenValue: Integer;
blueValue: Integer;
newRed: Integer;
newGreen: Integer;
newBlue: Integer;
begin
for i := 0 to (cursorBitMap.Height - 1) do
begin
row := cursorBitmap.ScanLine[i];
for j := 0 to (cursorBitMap.Width - 1) do
begin
redValue := GetRValue(row[j]);
greenValue := GetGValue(row[j]);
blueValue := GetBValue(row[j]);
//invert the colour
//(ie make it 'negative')
newRed := (255 - redValue);
newGreen := (255 - greenValue);
newBlue := (255 - blueValue);
row[j] := RGB(newRed, newGreen, newBlue);
end;
end;
end;