Method saveToFile

Source/Tools/ImageCompare/ImageCompare.cpp:117–183

    }

    void saveToFile(const std::filesystem::path& path, bool writeAlpha = true) const
    {
        FREE_IMAGE_FORMAT fifFormat = FIF_UNKNOWN;

        auto pathStr = path.string();

        // Determine file format.
        fifFormat = FreeImage_GetFIFFromFilename(pathStr.c_str());
        if (fifFormat == FIF_UNKNOWN)
            throw std::runtime_error("Unknown image format");
        if (!FreeImage_FIFSupportsWriting(fifFormat))
            throw std::runtime_error("Unsupported image format");

        bool writeFloat = fifFormat == FIF_EXR || fifFormat == FIF_PFM || fifFormat == FIF_HDR;
        if (fifFormat != FIF_EXR && fifFormat != FIF_PNG)
            writeAlpha = false;

        // Create bitmap.
        FIBITMAP* bitmap;
        const float* src = getData();
        if (writeFloat)
        {
            bitmap = FreeImage_AllocateT(writeAlpha ? FIT_RGBAF : FIT_RGBF, mWidth, mHeight);
            for (uint32_t y = 0; y < mHeight; y++)
            {
                float* dst = reinterpret_cast<float*>(FreeImage_GetScanLine(bitmap, mHeight - y - 1));
                if (writeAlpha)
                {
                    std::memcpy(dst, src, mWidth * 4 * sizeof(float));
                    src += mWidth * 4;
                }
                else
                {
                    for (uint32_t x = 0; x < mWidth; ++x)
                    {
                        dst[0] = src[0];
                        dst[1] = src[1];
                        dst[2] = src[2];
                        dst += 3;
                        src += 4;
                    }
                }
            }
        }
        else
        {
            bitmap = FreeImage_Allocate(mWidth, mHeight, writeAlpha ? 32 : 24);
            for (uint32_t y = 0; y < mHeight; y++)
            {
                uint8_t* dst = reinterpret_cast<uint8_t*>(FreeImage_GetScanLine(bitmap, mHeight - y - 1));
                for (uint32_t x = 0; x < mWidth; ++x)
                {
                    dst[2] = clamp(int(src[0] * 255.f), 0, 255);
                    dst[1] = clamp(int(src[1] * 255.f), 0, 255);
                    dst[0] = clamp(int(src[2] * 255.f), 0, 255);
                    if (writeAlpha)
                        dst[3] = clamp(int(src[3] * 255.f), 0, 255);
                    dst += writeAlpha ? 4 : 3;