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好吧，这是我第三次发布相同的问题（以前是here和here）。C++：BMP旋转图像
现在，在这个时候，我会尽量解释什么是我的问题：
- 所以第一他们，我需要旋转.BMP图像，它不是正常旋转。但我不需要旋转随机图像，扩展名为.bmp，我需要旋转this one。我尝试了很多其他图像，并且所有这些图像都正确旋转，除了我的图像。
- 在这一刻，我的代码只适用于180度，如何使它在90度倍数的任何程度上工作（我需要旋转我的图像只需90,180或270度，不是更多）。
- 我不需要任何外部库的这种类似的代码的CImage，OpenCV的，ImageMagik等等...我需要这个代码工作。
所以，就是这样。在这里你可以找到我的实际result。
CODE：
#include <array>
using namespace std;
struct BMP {
int width;
int height;
unsigned char header[54];
unsigned char *pixels;
int row_padded;
int size_padded;
};
void writeBMP(string filename, BMP image) {
string fileName = "Output Files\\" + filename;
FILE *out = fopen(fileName.c_str(), "wb");
fwrite(image.header, sizeof(unsigned char), 54, out);
unsigned char tmp;
for (int i = 0; i < image.height; i++) {
for (int j = 0; j < image.width * 3; j += 3) {
//Convert(B, G, R) to(R, G, B)
tmp = image.pixels[j];
image.pixels[j] = image.pixels[j + 2];
image.pixels[j + 2] = tmp;
}
}
fwrite(image.pixels, sizeof(unsigned char), image.size_padded, out);
fclose(out);
}
BMP readBMP(string filename) {
BMP image;
string fileName = "Input Files\\" + filename;
FILE *in = fopen(fileName.c_str(), "rb");
fread(image.header, sizeof(unsigned char), 54, in); // read the 54-byte header
// extract image height and width from header
image.width = *(int *) &image.header[18];
image.height = *(int *) &image.header[22];
image.row_padded = (image.width * 3 + 3) & (~3); // ok size of a single row rounded up to multiple of 4
image.size_padded = image.row_padded * image.height; // padded full size
image.pixels = new unsigned char[image.size_padded]; // yeah !
if (fread(image.pixels, sizeof(unsigned char), image.size_padded, in) == image.size_padded) {
unsigned char tmp;
for (int i = 0; i < image.height; i++) {
for (int j = 0; j < image.width * 3; j += 3) {
//Convert (B, G, R) to (R, G, B)
tmp = image.pixels[j];
image.pixels[j] = image.pixels[j + 2];
image.pixels[j + 2] = tmp;
}
}
}
fclose(in);
return image;
}
BMP rotate(BMP image, double degree) {
BMP newImage = image;
unsigned char *pixels = new unsigned char[image.size_padded];
int height = image.height;
int width = image.width;
for (int x = 0; x < height; x++) {
for (int y = 0; y < width; y++) {
pixels[(x * width + y) * 3 + 0] = image.pixels[((height - 1 - x) * width + (width - 1 - y)) * 3 + 0];
pixels[(x * width + y) * 3 + 1] = image.pixels[((height - 1 - x) * width + (width - 1 - y)) * 3 + 1];
pixels[(x * width + y) * 3 + 2] = image.pixels[((height - 1 - x) * width + (width - 1 - y)) * 3 + 2];
}
}
newImage.pixels = pixels;
return newImage;
}
int main() {
BMP image = readBMP("Input-1.bmp");
image = rotate(image, 180);
writeBMP("Output.bmp", image);
return 0;
}
你会使用OpenCV的 – RyanP