Originally Posted by
Salem
Not without seeing the latest code.
Anything else would be wild speculation.
Whoops, forgot to add that on the last post... here it is:
Code:
/****************************************************************************
* resize.c
*
* Computer Science 50
* Problem Set 4
*
* Resizes a BMP piece by piece, just because.
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "bmp.h"
int main(int argc, char* argv[])
{
// ensure proper usage
if (argc != 4)
{
printf("Usage: copy N infile outfile\n");
return 1;
}
// remember filenames
char* nchar = argv[1];
char* infile = argv[2];
char* outfile = argv[3];
int timeswriten = 0;
//convert nchar to an int
int n = atoi (nchar);
if (n < 1 || n > 100)
{
printf("Please try again with a positive number less then 100\n");
return 1;
}
// open input file
FILE* inptr = fopen(infile, "r");
if (inptr == NULL)
{
printf("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;
}
//save original image headder
int oldheight = bi.biHeight;
int oldwidth = bi.biWidth;
int oldpadding = (4-(oldwidth*sizeof(RGBTRIPLE)) % 4) % 4;
bi.biHeight = oldheight *n;
bi.biWidth = oldwidth *n;
int padding = (4 -(bi.biWidth * sizeof(RGBTRIPLE))%4)%4;
bi.biSizeImage = (bi.biWidth * sizeof(RGBTRIPLE) + padding) * abs(bi.biHeight);
bf.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + bi.biSizeImage;
// write outfile's BITMAPFILEHEADER and BITMAPINFOHEADER
fwrite(&bf, sizeof(BITMAPFILEHEADER), 1, outptr);
fwrite(&bi, sizeof(BITMAPINFOHEADER), 1, outptr);
RGBTRIPLE *buffer = malloc(sizeof(RGBTRIPLE) * bi.biWidth);
// iterate over infile's scanlines
for (int i = 0; i < abs(oldheight); i++)
{
// iterate over pixels in scanline
for (int j = 0; j < oldwidth; j++)
{
// temporary storage
RGBTRIPLE triple;
// read RGB triple from infile and store in buffer
fread(&triple, sizeof(RGBTRIPLE), 1, inptr);
//iterate over each pixel factor times
for (int k = 0; k < n; k++)
{
buffer[timeswriten++] = triple;
}
timeswriten = 0;
}
// skip over any input padding
fseek(inptr, oldpadding, SEEK_CUR);
// print each row from buffer factor times
for (int r = 0; r < n; r++)
{
// write RGB triple to outfile
fwrite(buffer, sizeof(RGBTRIPLE), bi.biWidth, outptr);
// write padding to outfile
for (int p = 0; p < padding; p++)
fputc(0x00, outptr);
}
}
// close infile
fclose(inptr);
// close outfile
fclose(outptr);
// that's all folks
return 0;
}