YUV資料畫矩形和直線

劃線函式用breshenham演算法，yuv資料格式為 422sp 。

//在yuvsp422資料上畫直線，imgdata是 yuv資料指標， int width, int height,yuv影象大小。 startpoint，endpoint 直線量端點，color 顏色。目前直線需要偶數其實位址

unsigned char cyf_breshenhamline(unsigned char* imgdata, int width, int height, my_cvpoint startpoint, my_cvpoint endpoint, my_cvcolor color)
if (width < 0 || height < 0 )
if (startpoint.x
<0 || startpoint.x > width || startpoint.y
< 0 || startpoint.y > height || endpoint.x
< 0 || endpoint.x > width || endpoint.y
< 0 || endpoint.y > height)
int imgsize = width*height;
int t;
intx0 = startpoint.x, x1 = endpoint.x;
inty0 = startpoint.y, y1 = endpoint.y;
int dy = abs(y1 - y
0); int dx = abs(x1 - x
0); hi_bool steep = dy>dx ?hi_true:hi_false;
hi_bool bisvertical =hi_false; //預設不是豎直的線，豎直的線對列上的uv分量不減少
if (x
0 == x1) //如果是豎線的話
if (steep)
if (x
0 > x1)
int deltax = x1 - x
0; int deltay = abs(y1 - y
0); int error = deltax/2;
int ystep;
inty = y
0; int
x; if (y
0< y1)
ystep = 1;
else
ystep = -1;
for (x = x
0; x
< x1; x++)
else
else}}
else
else
}error -= deltay;
if (error < 0) 
}return
1;}

//畫矩形,my_cvrect 需要2對齊

void cyf_drawrect_to_yuvsp422(unsigned char *src ,int srcwidth,int srcheight,my_cvrect rect_rio,my_cvcolor color)
*/cyf_breshenhamline(src, srcwidth, srcheight, point[0],point[1], color);
cyf_breshenhamline(src, srcwidth, srcheight, point[1],point[2], color);
cyf_breshenhamline(src, srcwidth, srcheight, point[3],point[2], color);
cyf_breshenhamline(src, srcwidth, srcheight, point[0],point[3], color);
}

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