#! /usr/bin/python

# Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

#

# Permission is hereby granted, free of charge, to any person obtaining a

# copy of this software and /or associated documentation files

# (the "Materials "), to deal in the Materials without restriction,

# including without limitation the rights to use, copy, modify, merge,

# publish, distribute, sublicense, and/or sell copies of the Materials,

# and to permit persons to whom the Materials are furnished to do so,

# subject to the following conditions:

#

# The above copyright notice and this permission notice shall be included

# in all copies or substantial portions of the Materials.

#

# THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR

# THE USE OR OTHER DEALINGS IN THE MATERIALS.

# Extremely coarse lrgb<->srgb conversion table generation

from c_utils import *

GAMMA_BITS = 8

def linear_to_gamma(f):

    if f <= 0.00304:

        return 12.92 * f

    return 1.0556*pow(f, 1/2.4) - 0.0556

def gamma_to_linear(f):

    if f <= 0.03928:

        return f / 12.92

    return pow((f+0.0556)/1.0556, 2.4)

def clamp(i, mn, mx):

    if i < mn:

        return mn

    if i > mx:

        return mx

    return i

def icolortof(i):

    return i / 255.0

def fcolortoi(f):

    return int(f * ((1<<GAMMA_BITS)-1) + 0.5)

all_components = range(0,256)

all_floats = map(icolortof, all_components)

def make_color_list(conv_func):

    return map(fcolortoi, map(conv_func, all_floats))

def make_lut_array(name, data):

    make_array("static const", "RIuint8", name, data, hex_formatter)  

def print_lrgb_to_srgb_table():

    make_lut_array("sc_lRGB_to_sRGB", make_color_list(linear_to_gamma))

def print_srgb_to_lrgb_table():

    make_lut_array("sc_sRGB_to_lRGB", make_color_list(gamma_to_linear))

def print_lookups():

    begin_include_guard("_SFGAMMARCP_H_") 

    print ""

    make_include("riDefs.h")

    print ""

    begin_namespace("OpenVGRI")

    print_srgb_to_lrgb_table()

    print ""

    print_lrgb_to_srgb_table()

    end_namespace()

    end_include_guard()

if __name__ == '__main__':

    print_lookups()