100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
#include <Windows.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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int main(int argc, char ** argv)
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{
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FILE *fp = fopen("C:\\Users\\leong\\Desktop\\bmp_exam\\input\\hello.bmp","rb");
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if (fp == 0)
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return 0;
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BITMAPFILEHEADER fileHead;
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fread(&fileHead, sizeof(BITMAPFILEHEADER), 1, fp);
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BITMAPINFOHEADER infoHead;
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fread(&infoHead, sizeof(BITMAPINFOHEADER), 1, fp);
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int width = infoHead.biWidth;
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int height = infoHead.biHeight;
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int biCount = infoHead.biBitCount;
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RGBQUAD *pColorTable;
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int pColorTableSize = 0;
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pColorTable = new RGBQUAD[256];
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fread(pColorTable, sizeof(RGBQUAD), 256, fp);
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pColorTableSize = 1024;
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unsigned char *pBmpBuf;
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int lineByte = width*floor(biCount/8);
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while(lineByte % 4 != 0){lineByte += 1;}
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pBmpBuf = new unsigned char[lineByte*height];
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fread(pBmpBuf, lineByte*height, 1, fp);
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fclose(fp);
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printf("倍：");
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// float lx, ly;
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// scanf("%f%f", &lx, &ly);
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// int dstWidth = round(double(lx*width));
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// int dstHeight = round(double(ly*height));
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float k;
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scanf("%f", &k);
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int dstWidth = round(double(k*width));
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int dstHeight = round(double(k*height));
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int lineByte2 = dstWidth*floor(biCount/8);
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while(lineByte2 % 4 != 0){lineByte2 += 1;}
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unsigned char*pBmpBuf2;
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pBmpBuf2 = new unsigned char[lineByte2*dstHeight];
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for (int i = 0; i < dstHeight; ++i){
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for (int j = 0; j < dstWidth; ++j){
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unsigned char *p;
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p = (unsigned char *)(pBmpBuf2 + lineByte2*i + j);
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(*p) = 255;
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}
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}
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int x = 0;
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int y = 0;
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for(int i = 0; i < height; ++i){
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for(int j = 0; j < width; ++j){
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unsigned char *p1, *p2;
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// x = round(double(lx*j));
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// y = round(double(ly*i));
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x = round(double(k*j));
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y = round(double(k*i));
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p1 = (unsigned char *)(pBmpBuf + i*lineByte + j);
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p2 = (unsigned char *)(pBmpBuf2 + y*lineByte2 + x);
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(*p2) = (*p1);
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}
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}
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FILE *fpo = fopen("C:\\Users\\leong\\Desktop\\bmp_exam\\output\\output.bmp", "wb");
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if (fpo == 0)
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return 0;
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BITMAPFILEHEADER dstFileHead;
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dstFileHead.bfOffBits = 14 + 40 + pColorTableSize;
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dstFileHead.bfReserved1 = 0;
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dstFileHead.bfReserved2 = 0;
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dstFileHead.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+pColorTableSize + lineByte2*dstHeight;
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dstFileHead.bfType = 0x4D42;
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fwrite(&dstFileHead, sizeof(dstFileHead), 1, fpo);
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BITMAPINFOHEADER dstInfoHead;
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dstInfoHead.biBitCount = biCount;
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dstInfoHead.biClrImportant = 0;
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dstInfoHead.biClrUsed = 0;
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dstInfoHead.biCompression = 0;
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dstInfoHead.biHeight = dstHeight;
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dstInfoHead.biPlanes = 1;
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dstInfoHead.biSize = 40;
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dstInfoHead.biSizeImage = lineByte2*dstHeight;
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dstInfoHead.biWidth = dstWidth;
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dstInfoHead.biXPelsPerMeter = 0;
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dstInfoHead.biYPelsPerMeter = 0;
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fwrite(&dstInfoHead, sizeof(BITMAPINFOHEADER), 1, fpo);
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fwrite(pColorTable, sizeof(RGBQUAD), 256, fpo);
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fwrite(pBmpBuf2, lineByte2*dstHeight, 1, fp);
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fclose(fpo);
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system("pause");
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return 0;
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} |