RGB数据生成BMP图片

#include<iostream> using namespace std; typedef struct /**** BMP file header structure ****/ { unsigned int bfSize; /* Size of file */ unsigned short bfReserved1; /* Reserved */ unsigned short bfReserved2; /* ... */ unsigned int bfOffBits; /* Offset to bitmap data */ } MyBITMAPFILEHEADER; typedef struct /**** BMP file info structure ****/ { unsigned int biSize; /* Size of info header */ int biWidth; /* Width of image */ int biHeight; /* Height of image */ unsigned short biPlanes; /* Number of color planes */ unsigned short biBitCount; /* Number of bits per pixel */ unsigned int biCompression; /* Type of compression to use */ unsigned int biSizeImage; /* Size of image data */ int biXPelsPerMeter; /* X pixels per meter */ int biYPelsPerMeter; /* Y pixels per meter */ unsigned int biClrUsed; /* Number of colors used */ unsigned int biClrImportant; /* Number of important colors */ } MyBITMAPINFOHEADER; void CreateRGBData(unsigned char *rgbout,int width,int height) { unsigned long idx=0; for(int j=0;j<height;j++) { idx=(height-j-1)*width*3;//该值保证所生成的rgb数据逆序存放在rgbbuf中 for(int i=0;i<width;i++) { unsigned char r,g,b; //生成一个包含红，蓝，绿，黄四种颜色的条纹图案吧 if(j/100==0)//红色 { r=13; g=246; b=8; } else if(j/100==1)//蓝色 { r=15; g=33; b=208; } else if(j/100==2)//绿色 { r=246; g=30; b=8; } else if(j/100==3)//黄色 { r=246; g=243; b=8; } rgbout[idx++]=b; rgbout[idx++]=r; rgbout[idx++]=g; } } } void MySaveBmp(string filename,unsigned char *rgbbuf,int width,int height) { MyBITMAPFILEHEADER bfh; MyBITMAPINFOHEADER bih; /* Magic number for file. It does not fit in the header structure due to alignment requirements, so put it outside */ unsigned short bfType=0x4d42; bfh.bfReserved1 = 0; bfh.bfReserved2 = 0; bfh.bfSize = 2+sizeof(MyBITMAPFILEHEADER) + sizeof(MyBITMAPINFOHEADER)+width*height*3; bfh.bfOffBits = 0x36; bih.biSize = sizeof(MyBITMAPINFOHEADER); bih.biWidth = width; bih.biHeight = height; bih.biPlanes = 1; bih.biBitCount = 24; bih.biCompression = 0; bih.biSizeImage = 0; bih.biXPelsPerMeter =0; bih.biYPelsPerMeter =0; bih.biClrUsed = 0; bih.biClrImportant = 0; FILE *file=NULL; fopen_s(&file,"c:\\MyTest.bmp", "wb"); if (!file) { printf("Could not write file\n"); return; } fwrite(&bfType,sizeof(bfType),1,file); fwrite(&bfh, sizeof(bfh),1 , file); fwrite(&bih, sizeof(bih),1 , file); fwrite(rgbbuf,width*height*3,1,file); fclose(file); } int main() { unsigned char* rgbbuffer; rgbbuffer=(unsigned char*)malloc(400*400*3); memset(rgbbuffer,0,400*400*3); CreateRGBData(rgbbuffer,400,400); MySaveBmp("C;\\MyTest.bmp",rgbbuffer,400,400); free(rgbbuffer); return 0; }