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| /**
Автор: programina
Описание: уменьшает точечный рисунок .bmp в два раза
Время: 11:01(моск. время) 27.05.2012
**/
#include <stdio.h>
#include <stdlib.h>
#pragma pack(push,1)
typedef struct tagBITMAPFILEHEADER{
unsigned short bfType;
unsigned long bfSize;
unsigned short bfReserved1;
unsigned short bfReserved2;
unsigned long bfOffBits;
} BITMAPFILEHEADER;
#pragma pack(pop)
#pragma pack(push,2)
typedef struct tagBITMAPINFOHEADER{
unsigned int biSize;
long biWidth;
long biHeight;
unsigned short biPlanes;
unsigned short biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
long biXPelsPerMeter;
long biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
} BITMAPINFOHEADER;
#pragma pack(pop)
struct PIXEL{
unsigned char b;
unsigned char g;
unsigned char r;
};
int main()
{
BITMAPFILEHEADER headfirst;
BITMAPINFOHEADER headsecond;
PIXEL pixel;
FILE *fin, *fou;
int j = 0;
int i = 0;
int k = 0;
int l = 0;
fin = fopen("picture1.bmp","rb+");
fou = fopen("picture2.bmp","wb+");
fread( &headfirst, sizeof(BITMAPFILEHEADER), 1, fin );
fread( &headsecond, sizeof(BITMAPINFOHEADER), 1, fin );
headsecond.biWidth /= 2;
headsecond.biHeight /= 2;
fwrite( &headfirst, sizeof(BITMAPFILEHEADER), 1, fou );
fwrite( &headsecond, sizeof(BITMAPINFOHEADER), 1, fou );
for (int i = 0; i < headsecond.biHeight*2; i +=1)
{
l++;
if (l==2)
{
l=0;
for (j = 0; j < headsecond.biWidth*2; j += 1)
{
fread( &pixel.b, 1, 1, fin );
fread( &pixel.g, 1, 1, fin );
fread( &pixel.r, 1, 1, fin );
k++;
if (k==2)
{
k=0;
fwrite( &pixel.b, 1, 1, fou );
fwrite( &pixel.g, 1, 1, fou );
fwrite( &pixel.r, 1, 1, fou );
}
}
}
else
{
l=l;
for (j = 0; j < headsecond.biWidth*2; j += 1)
{
fread( &pixel.b, 1, 1, fin );
fread( &pixel.g, 1, 1, fin );
fread( &pixel.r, 1, 1, fin );
}
}
}
fclose(fin);
fclose(fou);
system("pause");
return 0;
} |
