编码时遇到下面问题
背景颜色和前景颜色需要取反
COLORREF m_clr[5];
//背景颜色
m_listPD.SetItemData(nCount,m_clr[nUltraOrder]);
//字的颜色取反
m_listPD.SetItemColor(nCount,0xFFFFFF - m_clr[nUltraOrder]);
方法即是
0xFFFFFF - $oldcolor
转自
echo dechex(0xFFFFFF - $oldcolor); 把原文贴出来吧，不然可能不知道怎么来的。You can invert a color by subtracting each of its red, green, and blue components from 255. In other words: new_red = 255 - old_red new_green = 255 - old_green new_blue = 255 - old_blueYou can break a color into its components, use this technique to invert the components, and then use RGB to recombine them into the inverted color. However, there is a much simpler method.If a color's components are given as R, G, and B, then the color is represented as: R + 256 * G + 256 * 256 * BNow consider the representation of inverse of this color with components 255 - R, 255 - G, and 255 - B: (255 - R) + 256 * (255 - G) + 256 * 256 * (255 - B) = (255 + 256 * 255 + 256 * 256 * 255) - (R + 256 * G + 256 * 256 * B) = &HFFFFFF - the_original_colorSo a simpler method for calculating the inverse of a color is: new_color = &HFFFFFF - old_color