been on this problem for over a month now. Still cannot resize images as required. When I run code, only the first row is resized. Other pixels return unmatched pixel colours. I would appreciate any help.
int main(int argc, char *argv[]) {
// ensure proper usage
if (argc != 4)
{
fprintf(stderr, "Usage: copy infile outfile\n");
return 1;
}
// checking for positive interger less than or equal to 100
int n = atoi(argv[1]);
if (n > 100 || n < 1)
{
fprintf(stderr, "Must be positive and less than 100 %i\n", n);
return 4 ;
}
// remember filenames
char *infile = argv[2];
char *outfile = argv[3];
// open input file
FILE *inptr = fopen(infile, "r");
if (inptr == NULL)
{
fprintf(stderr, "Could not open %s.\n", infile);
return 2;
}
// open output file
FILE *outptr = fopen(outfile, "w");
if (outptr == NULL)
{
fclose(inptr);
fprintf(stderr, "Could not create %s.\n", outfile);
return 3;
}
// read infile's BITMAPFILEHEADER
BITMAPFILEHEADER bf;
fread(&bf, sizeof(BITMAPFILEHEADER), 1, inptr);
// read infile's BITMAPINFOHEADER
BITMAPINFOHEADER bi;
fread(&bi, sizeof(BITMAPINFOHEADER), 1, inptr);
// ensure infile is (likely) a 24-bit uncompressed BMP 4.0
if (bf.bfType != 0x4d42 || bf.bfOffBits != 54 || bi.biSize != 40 ||
bi.biBitCount != 24 || bi.biCompression != 0)
{
fclose(outptr);
fclose(inptr);
fprintf(stderr, "Unsupported file format.\n");
return 4;
}
// temporary variable to hold the biWidth and biHeight
int o_width = bi.biWidth;
int o_height = abs(bi.biHeight);
bi.biWidth *= n;
bi.biHeight *= n;
// determine padding for scanlines
int o_padding = (4 - (bi.biWidth * sizeof(RGBTRIPLE)) % 4) % 4;
int padding = (4 - (o_width * sizeof(RGBTRIPLE)) % 4) % 4;
// write outfile's BITMAPFILEHEADER
fwrite(&bf, sizeof(BITMAPFILEHEADER), 1, outptr);
// write outfile's BITMAPINFOHEADER
fwrite(&bi, sizeof(BITMAPINFOHEADER), 1, outptr);
// temporary storage
RGBTRIPLE triple;
// iterate over infile's scanlines
int i, j, k, l, m, o;
//Iterating through the height
for (i = 0; i < o_height; i++)
{
for (j = 0; j < n ; j++)
{
//Iterating through the width
for (k = 0; k < o_width; k++)
{
fread(&triple, sizeof(RGBTRIPLE), 1, inptr);
for(l = 0; l < n; l++)
{
fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr);
}
}
// Addding the padding for the output file
for(m = 0; m < o_padding; m++)
{
fputc(0x00, outptr);
}
// Sending the cursor for the input file back
fseek(inptr, -1*(o_width*sizeof(RGBTRIPLE)), SEEK_CUR);
}
// repeat process for writing the pixels
for (o = 0; o < o_width; o++)
{
fread(&triple, sizeof(RGBTRIPLE), 1, inptr);
for (o = 0; o < n; o++)
{
{
fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr);
}
}
}
for(m = 0; m < o_padding; m++)
{
fputc(0x00, outptr);
}
fseek(inptr, padding, SEEK_CUR);
}
// close infile
fclose(inptr);
// close outfile
fclose(outptr);
// success
return 0; }