我正在尝试在C++代码中导出一个.bmp文件,现在已经有了一部分的成果,但是还有一个重要的问题:行填充。我不是100%确定行填充的工作原理,但我知道我需要它。我的算法除了填充以外都已经成功,我手动在导出的图像上在十六进制编辑器中添加了填充,并且它奏效了。但是如何添加填充呢?这是我的代码:
//Size of the file in bytes
int fileSize = 54 + (3 * width * height);
//The sections of the file
unsigned char generalHeader[14] = {'B','M',0,0, 0,0,0,0, 0,0,54,0, 0,0};
unsigned char DIBHeader[40] = {40,0,0,0, 0,0,0,0, 0,0,0,0, 1,0,24,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
unsigned char pixelArray[1000000];
unsigned char bmpPad[3] = {0, 0, 0};
//Set the binary portion of the generalHeader, mainly just file size
generalHeader[2] = (unsigned char)(fileSize);
generalHeader[3] = (unsigned char)(fileSize >> 8);
generalHeader[4] = (unsigned char)(fileSize >> 16);
generalHeader[5] = (unsigned char)(fileSize >> 24);
//The binary variable portion of the DIB header
DIBHeader[4] = (unsigned char)(width);
DIBHeader[5] = (unsigned char)(width >> 8);
DIBHeader[6] = (unsigned char)(width >> 16);
DIBHeader[7] = (unsigned char)(width >> 24);
DIBHeader[8] = (unsigned char)(height);
DIBHeader[9] = (unsigned char)(height >> 8);
DIBHeader[10] = (unsigned char)(height >> 16);
DIBHeader[11] = (unsigned char)(height >> 24);
//Loop through all width and height places to add all pixels
int counter = 0;
for(short j = height; j >= 0; j--)
{
for(short i = 0; i < width; i++)
{
//Add all 3 RGB values
pixelArray[counter] = pixelColour[i][j].red;
pixelArray[counter] = pixelColour[i][j].green;
pixelArray[counter] = pixelColour[i][j].blue;
counter++;
}
}
//Open it
ofstream fileWorking(fileName);
//Write the sections
fileWorking.write((const char*)generalHeader, 14);
fileWorking.write((const char*)DIBHeader, 40);
fileWorking.write((const char*)pixelArray, 3 * width * height);
//NO MEMORY LEAKS 4 ME
fileWorking.close();
pixelColour是一个结构体数据类型,包含三种颜色,所有颜色的类型都是unsigned char。非常感谢您的帮助!