Save to TGA image file in C

TGAImage.c

// 32 bit image
 typedef struct {
 int width, height;
 int** data;
 } RBitmap;
 
int write_truecolor_tga( RBitmap* data ) {
 FILE *fp = fopen("out.tga", "w");
 if (fp == NULL) return 0;
 
// The image header
 char header[ 18 ] = { 0 }; // char = byte
 header[ 2 ] = 2; // truecolor
 header[ 12 ] = data->width & 0xFF;
 header[ 13 ] = (data->width >> 8) & 0xFF;
 header[ 14 ] = data->height & 0xFF;
 header[ 15 ] = (data->height >> 8) & 0xFF;
 header[ 16 ] = 24; // bits per pixel
 
fwrite((const char*)&header, 1, sizeof(header), fp);
 
// The image data is stored bottom-to-top, left-to-right
 for (int y = data->height -1; y >= 0; y--)
 for (int x = 0; x < data->width; x++)
 {
 char b = (data->data[x][y] & 0x0000FF);
 char g = (data->data[x][y] & 0x00FF00) >> 8;
 char r = (data->data[x][y] & 0xFF0000) >> 16;
 putc((int)(b & 0xFF),fp);
 putc((int)(g & 0xFF),fp);
 putc((int)(r & 0xFF),fp);
 }
 
// The file footer
 static const char footer[ 26 ] =
 "\0\0\0\0" // no extension area
 "\0\0\0\0" // no developer directory
 "TRUEVISION-XFILE" // yep, this is a TGA file
 ".";
 fwrite((const char*)&footer, 1, sizeof(footer), fp);
 
fclose(fp);
 return 1;
 }