#!/bin/bash

#

# render_convertGplToHex.sh -- This function takes one palette

# produced by Gimp (e.g., syslinux.gpl) as input and outputs the list

# of hexadecimal colors and their respective index position the

# `pnmtolss16' program needs (e.g., #RRGGBB=0 #RRGGBB=1 ... [all

# values in the same line]).

#

# Copyright (C) 2009-2011 Alain Reguera Delgado

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or (at

# your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

# ----------------------------------------------------------------------

# $Id$

# ----------------------------------------------------------------------

function render_convertGplToHex {

    local COLOR=''

    local COUNT=0

    local -a FILES

    # Define path to GPL palette. This is the .gpl file we use to

    # retrive color information from.

    local PALETTE_GPL="$1"

    # Define path to HEX palette. This is the palette used to stored

    # the color information the `ppmtolss16' program needs.

    local PALETTE_HEX="$2"

    # Define the number of colors this function should return.

    local COLOR_NUMBER="$3"

    # Verify the number of colors this function should return. As

    # convenction, we are producing images in 14 and 16 colors only to

    # cover Grub and Syslinux images need respectively.

    if [[ ! $COLOR_NUMBER =~ '^(14|16)$' ]];then

        cli_printMessage "`eval_gettext "Reducing image to \\\`\\\$COLOR_NUMBER' colors is not supported."`" 'AsErrorLine'

        cli_printMessage "${FUNCDIRNAM}" 'AsToKnowMoreLine'

    fi

    # Define list of colors from GPL palette.

    local COLORS=$(render_getColors "$PALETTE_GPL")

    # Verify number of colors returned in the list.

    if [[ ! $(echo "$COLORS" |  wc -l) =~ $COLOR_NUMBER ]];then

        cli_printMessage "`gettext "The palette doesn't have the correct number of colors."`" 'AsErrorLine'

        cli_printMessage "${FUNCDIRNAM}" 'AsToKnowMoreLine'

    fi

    # Verify format of colors inside the list.

    for COLOR in $COLORS;do

        if [[ ! $COLOR =~ '^[0-9a-f]{6}$' ]];then

            cli_printMessage "`eval_gettext "The \\\`\\\$COLOR' string isn't a valid color code."`" 'AsErrorLine'

            cli_printMessage "${FUNCDIRNAM}" 'AsToKnowMoreLine'

        fi

    done

    # Create list of colors to be process by pnmtolss16 

    echo "$COLORS" | nl | awk '{ printf "#%s=%d ", $2, $1 - 1 }' \

        > $PALETTE_HEX

    # Verify HEX palette existence.

    cli_checkFiles "$PALETTE_PPM" 'f'

}