rt_pixtype_get_min_value()

double rt_pixtype_get_min_value

(

rt_pixtype

pixtype

)

Return minimum value possible for pixel type.

Parameters

pixtype

: the pixel type to get minimum possible value for

Returns

the minimum possible value for the pixel type.

Definition at line 156 of file rt_pixel.c.

                                             {
        switch (pixtype) {
                case PT_1BB: {
                        return (double) rt_util_clamp_to_1BB((double) CHAR_MIN);
                }
                case PT_2BUI: {
                        return 0;
                }
                case PT_4BUI: {
                        return 0;
                }
                case PT_8BUI: {
                        return 0;
                }
                case PT_8BSI: {
                        return (double) rt_util_clamp_to_8BSI((double) SCHAR_MIN);
                }
                case PT_16BSI: {
                        return (double) rt_util_clamp_to_16BSI((double) SHRT_MIN);
                }
                case PT_16BUI: {
                        return 0;
                }
                case PT_16BF: {
                        return (double)-POSTGIS_RT_16F_MAX;
                }
                case PT_32BSI: {
                        return (double)rt_util_clamp_to_32BSI((double)INT_MIN);
                }
                case PT_32BUI: {
                        return 0;
                }
                case PT_32BF: {
                        return (double) -FLT_MAX;
                }
                case PT_64BF: {
                        return (double) -DBL_MAX;
                }
                default: {
                        rterror("rt_pixtype_get_min_value: Unknown pixeltype %d", pixtype);
                        return (double) rt_util_clamp_to_8BUI((double) CHAR_MIN);
                }
        }
}

References POSTGIS_RT_16F_MAX, PT_16BF, PT_16BSI, PT_16BUI, PT_1BB, PT_2BUI, PT_32BF, PT_32BSI, PT_32BUI, PT_4BUI, PT_64BF, PT_8BSI, PT_8BUI, rt_util_clamp_to_16BSI(), rt_util_clamp_to_1BB(), rt_util_clamp_to_32BSI(), rt_util_clamp_to_8BSI(), rt_util_clamp_to_8BUI(), and rterror().

Referenced by RASTER_mapAlgebra2(), RASTER_minPossibleValue(), RASTER_reclass_exact(), RASTER_union_transfn(), rt_band_corrected_clamped_value(), rt_band_get_min_value(), rt_band_get_nearest_pixel(), and test_pixtype_get_min_value().

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