在 C++ 中将一个简单的图像缓冲区保存为 png
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Saving a simple image buffer to png in C++
提问by henle
I'd like to do this in a platform independant way, and I know libpng is a possibility, but I find it hard to figure out how. Does anyone know how to do this in a simple way?
我想以独立于平台的方式执行此操作，并且我知道 libpng 是一种可能性，但我发现很难弄清楚如何进行。有谁知道如何以简单的方式做到这一点？
采纳答案by Matthieu M.
There is a C++ wrapper for libpngcalled Png++. Check it hereor just google it.
有一个 C++ 包装器用于libpng调用Png++. 在这里检查或只是谷歌它。
They have a real C++ interface with templates and such that uses libpngunder the hood. I've found the code I have written quite expressive and high-level.
他们有一个带有模板的真正的 C++ 接口，并且libpng在幕后使用。我发现我编写的代码非常具有表现力和高级别的。
Example of "generator" which is the heart of the algorithm:
作为算法核心的“生成器”示例：
class PngGenerator : public png::generator< png::gray_pixel_1, PngGenerator>
{
typedef png::generator< png::gray_pixel_1, PngGenerator> base_t;
public:
typedef std::vector<char> line_t;
typedef std::vector<line_t> picture_t;
PngGenerator(const picture_t& iPicture) :
base_t(iPicture.front().size(), iPicture.size()),
_picture(iPicture), _row(iPicture.front().size())
{
} // PngGenerator
png::byte* get_next_row(size_t pos)
{
const line_t& aLine = _picture[pos];
for(size_t i(0), max(aLine.size()); i < max; ++i)
_row[i] = pixel_t(aLine[i] == Png::White_256);
// Pixel value can be either 0 or 1
// 0: Black, 1: White
return row_traits::get_data(_row);
} // get_next_row
private:
// To be transformed
const picture_t& _picture;
// Into
typedef png::gray_pixel_1 pixel_t;
typedef png::packed_pixel_row< pixel_t > row_t;
typedef png::row_traits< row_t > row_traits;
row_t _row; // Buffer
}; // class PngGenerator
And usage is like this:
用法是这样的：
std::ostream& Png::write(std::ostream& out)
{
PngGenerator aPng(_picture);
aPng.write(out);
return out;
}
There were some bits still missing from libpng(interleaving options and such), but frankly I did not use them so it was okay for me.
仍然缺少一些位libpng（交错选项等），但坦率地说，我没有使用它们，所以对我来说没关系。
回答by sbk
I'd say libpng is still the easiest way. There's example read -> process -> write png program, it is fairly simple once you strip the error handling (setjmp/longjmp/png_jmpbuf) stuff. It doesn't get simpler than that.
我会说 libpng 仍然是最简单的方法。有一个例子 read -> process -> write png program，一旦你去掉了错误处理（setjmp/longjmp/png_jmpbuf）的东西，它就相当简单了。没有比这更简单的了。
