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19 年
求助:关于DirectDraw中不同颜色深度的surface转换效率
一般来说,WinAPI函数StretchBlt可以将一种颜色深度的DirectDraw Surface转换为另一种颜色深度的DirectDraw Surface,效率是可以接受的。 可是我的应用比较特殊,需要将带调色板的8bit颜色深度的Surface转换为32bit颜色深度的Surface,而前者带有逐象素的alpha信息,请问怎样 ...
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