Create Bitmap example

 #include <stdio.h>  
 const int BYTES_PER_PIXEL = 3; /// red, green, & blue  
 const int FILE_HEADER_SIZE = 14;  
 const int INFO_HEADER_SIZE = 40;  
 void generateBitmapImage(unsigned char* image, int height, int width, char* imageFileName);  
 unsigned char* createBitmapFileHeader(int height, int stride);  
 unsigned char* createBitmapInfoHeader(int height, int width);  
 int main()  
 {  
   int height = 361;  
   int width = 867;  
   unsigned char image[361][867][BYTES_PER_PIXEL];  
   char* imageFileName = (char*)"c:\\Work\\bitmapImage.bmp";  
   int i, j;  
   for (i = 0; i < height; i++) {  
     for (j = 0; j < width; j++) {  
       image[i][j][2] = (unsigned char)(i * 255 / height);       ///red  
       image[i][j][1] = (unsigned char)(j * 255 / width);       ///green  
       image[i][j][0] = (unsigned char)((i + j) * 255 / (height + width)); ///blue  
     }  
   }  
   generateBitmapImage((unsigned char*)image, height, width, imageFileName);  
   printf("Image generated!!");  
 }  
 void generateBitmapImage(unsigned char* image, int height, int width, char* imageFileName)  
 {  
   int widthInBytes = width * BYTES_PER_PIXEL;  
   unsigned char padding[3] = { 0, 0, 0 };  
   int paddingSize = (4 - (widthInBytes) % 4) % 4;  
   int stride = (widthInBytes)+paddingSize;  
   FILE* imageFile = fopen(imageFileName, "wb");  
   unsigned char* fileHeader = createBitmapFileHeader(height, stride);  
   fwrite(fileHeader, 1, FILE_HEADER_SIZE, imageFile);  
   unsigned char* infoHeader = createBitmapInfoHeader(height, width);  
   fwrite(infoHeader, 1, INFO_HEADER_SIZE, imageFile);  
   int i;  
   for (i = 0; i < height; i++) {  
     fwrite(image + (i * widthInBytes), BYTES_PER_PIXEL, width, imageFile);  
     fwrite(padding, 1, paddingSize, imageFile);  
   }  
   fclose(imageFile);  
 }  
 unsigned char* createBitmapFileHeader(int height, int stride)  
 {  
   int fileSize = FILE_HEADER_SIZE + INFO_HEADER_SIZE + (stride * height);  
   static unsigned char fileHeader[] = {  
     0,0,   /// signature  
     0,0,0,0, /// image file size in bytes  
     0,0,0,0, /// reserved  
     0,0,0,0, /// start of pixel array  
   };  
   fileHeader[0] = (unsigned char)('B');  
   fileHeader[1] = (unsigned char)('M');  
   fileHeader[2] = (unsigned char)(fileSize);  
   fileHeader[3] = (unsigned char)(fileSize >> 8);  
   fileHeader[4] = (unsigned char)(fileSize >> 16);  
   fileHeader[5] = (unsigned char)(fileSize >> 24);  
   fileHeader[10] = (unsigned char)(FILE_HEADER_SIZE + INFO_HEADER_SIZE);  
   return fileHeader;  
 }  
 unsigned char* createBitmapInfoHeader(int height, int width)  
 {  
   static unsigned char infoHeader[] = {  
     0,0,0,0, /// header size  
     0,0,0,0, /// image width  
     0,0,0,0, /// image height  
     0,0,   /// number of color planes  
     0,0,   /// bits per pixel  
     0,0,0,0, /// compression  
     0,0,0,0, /// image size  
     0,0,0,0, /// horizontal resolution  
     0,0,0,0, /// vertical resolution  
     0,0,0,0, /// colors in color table  
     0,0,0,0, /// important color count  
   };  
   infoHeader[0] = (unsigned char)(INFO_HEADER_SIZE);  
   infoHeader[4] = (unsigned char)(width);  
   infoHeader[5] = (unsigned char)(width >> 8);  
   infoHeader[6] = (unsigned char)(width >> 16);  
   infoHeader[7] = (unsigned char)(width >> 24);  
   infoHeader[8] = (unsigned char)(height);  
   infoHeader[9] = (unsigned char)(height >> 8);  
   infoHeader[10] = (unsigned char)(height >> 16);  
   infoHeader[11] = (unsigned char)(height >> 24);  
   infoHeader[12] = (unsigned char)(1);  
   infoHeader[14] = (unsigned char)(BYTES_PER_PIXEL * 8);  
   return infoHeader;  
 }