C/C++一些隐藏的问题

 1 /*************************HSVtoColor*******************************/
 2 enum { Red,Orange, Yellow, Green, Cyan, Blue,Violet , White, Dark } Color;
 3 int HSVtoColor(float H, float S, float V)
 4 {
 5     if (!(H >= 0 && H <= 360 && S <= 1 && S >= 0 && V >= 0 && V <= 1))
 6     {
 7         printf("HSV is invalid !\n");
 8         getchar();
 9         exit(0);
10     }
11 
12     if (V <= 0.2)return Dark;
13     else{
14         if (S <= 0.1)return White;
15         /*(330，20)．(20。45)，(45．75)，(75，165)，(165，200)，(200，270)，
16         (270，330)，H分别取值为0，I，2,3，4，5，6代表红、橙、黄、绿、
17         青、蓝、紫。*/
18         /*****************************************************************/
19         if (H >= 330 && H <=359 || H >= 0 && H < 20)  return Red; 
20         if (H >= 20 && H < 45)return Orange;
21         if (H >= 45 && H < 75)return Yellow;
22         if (H >= 75 && H < 165)return Green;
23         if (H >= 165 && H < 200)return Cyan;
24         if (H >= 200 && H < 270)return Blue;
25         if (H >= 270 && H < 330)return Violet;
26         //return Red;
27     }
28 }
29 
30 
31 /****************************GetInfoOfJpeg***********************************/
32 int GetInfoOfJpeg(char *file_path, float info[9], int gap , int mode /* = 1*/ )
33 {
34     for (int i = 0; i < 9; i++)info[i] = 0;
35     FIBITMAP *bitmap = FreeImage_Load(FIF_JPEG, file_path);
36     if (bitmap)
37     {
38         int BPP = FreeImage_GetBPP(bitmap);
39         if (BPP < 16){ cout << "invalid JPEG -----GetInfoOfJpeg()\n"; return 0; }
40 
41         int height = FreeImage_GetHeight(bitmap);
42         int weight = FreeImage_GetWidth(bitmap);
43         int x, y;
44         RGBQUAD color;
45         uchar *pcolor = (uchar *)&color;
46         float hsv[3];
47         for (y = 0; y < height; y += gap)
48             for (x = 0; x < weight; x += gap)
49             {
50                 FreeImage_GetPixelColor(bitmap, x, y, &color);
51                 RGBtoHSV (pcolor[FI_RGBA_RED], pcolor[FI_RGBA_GREEN], pcolor[FI_RGBA_BLUE], hsv);
52                 cout<<"HSV :"<<HSVtoColor(hsv[0], hsv[1], hsv[2])<<endl;
53                 info[HSVtoColor(hsv[0], hsv[1], hsv[2])]++;
54             }
55         int sample_pixels = (weight*height) / (gap*gap);//the number of sample pixels
56         if (mode == 1)for (int i = 0; i < 9; i++)info[i] = info[i] / sample_pixels;
57     
58         return 1;
59         //cout << "color:" << HSVtoColor(hsv[0], hsv[1], hsv[2]);
60     }
61 
62     
63 }//GetInfoOfJpeg