#include <stdio.h>
#include <stdlib.h>
//bu verilmiş hazır kodlar bunda 2. parametre olarak vereceğim bitmap ı yeniden boyutlandırmaya çalşyrm
// ./resize 2 small.bmp larger.bmp ----> ilk parametrede kaç la ölçeklendreceğmi ikinci parametre ölçeklendrlcek resmi 3. prmetre de ölçeklediğim resmin dosyası
//olcak sekilde görev tanımı var
#include "bmp.h"
int main(int argc, char *argv[])
{
// ensure proper usage
if (argc != 3)
{
fprintf(stderr
, "Usage: copy infile outfile\n");
return 1;
}
// remember filenames
char *infile = argv[1];
char *outfile = argv[2];
// 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)
{
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)
{
fprintf(stderr
, "Unsupported file format.\n");
return 4;
}
// write outfile's BITMAPFILEHEADER
fwrite(&bf
, sizeof(BITMAPFILEHEADER
), 1, outptr
);
// write outfile's BITMAPINFOHEADER
fwrite(&bi
, sizeof(BITMAPINFOHEADER
), 1, outptr
);
// determine padding for scanlines
int padding = (4 - (bi.biWidth * sizeof(RGBTRIPLE)) % 4) % 4;
// iterate over infile's scanlines
for (int i
= 0, biHeight
= abs(bi.
biHeight); i
< biHeight
; i
++)
{
// iterate over pixels in scanline
for (int j = 0; j < bi.biWidth; j++)
{
// temporary storage
RGBTRIPLE triple;
// read RGB triple from infile
fread(&triple
, sizeof(RGBTRIPLE
), 1, inptr
);
// write RGB triple to outfile
fwrite(&triple
, sizeof(RGBTRIPLE
), 1, outptr
);
}
// skip over padding, if any
fseek(inptr
, padding
, SEEK_CUR
);
// then add it back (to demonstrate how)
for (int k = 0; k < padding; k++)
{
}
}
// close infile
// close outfile
// success
return 0;
}
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