181 translate_gamma_flags(png_structp png_ptr, png_fixed_point output_gamma,  in translate_gamma_flags()  argument
189    if (output_gamma == PNG_DEFAULT_sRGB ||  in translate_gamma_flags()
190       output_gamma == PNG_FP_1 / PNG_DEFAULT_sRGB)  in translate_gamma_flags()
199          output_gamma = PNG_GAMMA_sRGB;  in translate_gamma_flags()
201          output_gamma = PNG_GAMMA_sRGB_INVERSE;  in translate_gamma_flags()
204    else if (output_gamma == PNG_GAMMA_MAC_18 ||  in translate_gamma_flags()
205       output_gamma == PNG_FP_1 / PNG_GAMMA_MAC_18)  in translate_gamma_flags()
208          output_gamma = PNG_GAMMA_MAC_OLD;  in translate_gamma_flags()
210          output_gamma = PNG_GAMMA_MAC_INVERSE;  in translate_gamma_flags()
213    return output_gamma;  in translate_gamma_flags()
218 convert_gamma_value(png_structp png_ptr, double output_gamma)  in convert_gamma_value()  argument
227    if (output_gamma > 0 && output_gamma < 128)  in convert_gamma_value()
228       output_gamma *= PNG_FP_1;  in convert_gamma_value()
231    output_gamma = floor(output_gamma + .5);  in convert_gamma_value()
233    if (output_gamma > PNG_FP_MAX || output_gamma < PNG_FP_MIN)  in convert_gamma_value()
236    return (png_fixed_point)output_gamma;  in convert_gamma_value()
244    png_fixed_point output_gamma)  in png_set_alpha_mode_fixed()  argument
254    output_gamma = translate_gamma_flags(png_ptr, output_gamma, 1/*screen*/);  in png_set_alpha_mode_fixed()
262    if (output_gamma < 70000 || output_gamma > 300000)  in png_set_alpha_mode_fixed()
268    file_gamma = png_reciprocal(output_gamma);  in png_set_alpha_mode_fixed()
299          output_gamma = PNG_FP_1;  in png_set_alpha_mode_fixed()
327    png_ptr->screen_gamma = output_gamma;  in png_set_alpha_mode_fixed()
353 png_set_alpha_mode(png_structp png_ptr, int mode, double output_gamma)  in png_set_alpha_mode()  argument
356       output_gamma));  in png_set_alpha_mode()