正点原子ov5640摄像头输出窗口缩放问题

溪悦哦 · 发表于 2022-3-14 22:44:00

我的屏幕是1024*600的
if(lcddev.height >= 800)
      {
            yoffset = (lcddev.height - 800) / 2;
            outputheight = 800;
      }
else
      {
            yoffset = 0;
            outputheight = lcddev.height;
      }
/***********************************************/
改模式：
if(scale == 0)
      {
            fac = 800 / outputheight;       //得到比例因子
            OV5640_OutSize_Set((1280 - fac * lcddev.width) / 2, (800 - fac * outputheight) / 2, lcddev.width, outputheight);
            sprintf((char*)msgbuf, "Full Size 1:1");
      }
else
      {
            OV5640_OutSize_Set(4, 0, lcddev.width, outputheight);
            sprintf((char*)msgbuf, "Scale");
      }

问题：
            OV5640_OutSize_Set((1280 - fac * lcddev.width) / 2, (800 - fac * outputheight) / 2, lcddev.width, outputheight);
这一句
1280 - fac * lcddev.width=1280-800/600*1024=1280-1365怎么是负的？