Function stbi__hdr_convert

lite/example/cpp_example/mge/cv/stb_image.h:7790–7820

}

static void stbi__hdr_convert(float* output, stbi_uc* input, int req_comp) {
    if (input[3] != 0) {
        float f1;
        // Exponent
        f1 = (float)ldexp(1.0f, input[3] - (int)(128 + 8));
        if (req_comp <= 2)
            output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
        else {
            output[0] = input[0] * f1;
            output[1] = input[1] * f1;
            output[2] = input[2] * f1;
        }
        if (req_comp == 2)
            output[1] = 1;
        if (req_comp == 4)
            output[3] = 1;
    } else {
        switch (req_comp) {
            case 4:
                output[3] = 1; /* fallthrough */
            case 3:
                output[0] = output[1] = output[2] = 0;
                break;
            case 2:
                output[1] = 1; /* fallthrough */
            case 1:
                output[0] = 0;
                break;
        }
    }
}

static float* stbi__hdr_load(
        stbi__context* s, int* x, int* y, int* comp, int req_comp,