A C++ port of pixelmatch, the smallest, simplest and fastest JavaScript pixel-level image comparison library.

namespace mapbox {

uint64_t pixelmatch(const uint8_t* img1,
                    const uint8_t* img2,
                    std::size_t width,
                    std::size_t height,
                    uint8_t* output = nullptr,
                    double threshold = 0.1,
                    bool includeAA = false);

}

img1 and img2 must point to buffers of size width * height * 4. The return value is the number of mismatched pixels.

Optional arguments:

• output - If non-null, must point to an output buffer of the same size, which recieves the diff.
• threshold — Matching threshold, ranges from 0 to 1. Smaller values make the comparison more sensitive.
• includeAA — If true, disables detecting and ignoring anti-aliased pixels.