#!/bin/bash

#

# svg_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, 2010, 2011 The CentOS Project

#

# 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 svg_convertGplToHex {

    # 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 NUMBER="$3"

    # Define list of colors from GPL palette.

    local COLORS=$(svg_getColors $PALETTE_GPL --head=$NUMBER --tail=$NUMBER)

    # Verify number of colors returned in the list. They must match

    # exactly the amount specified, no more no less. Sometimes, the

    # list of colors may have less colors than it should have, so we

    # need to prevent such palettes from being used.

    svg_checkColorAmount "$COLORS" "$NUMBER"

    # Verify format of colors.

    svg_checkColorFormats "$COLORS" --format='rrggbb'

    # Create list of colors to be processed by `pnmtolss16'.

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

        > $PALETTE_HEX

    # Verify HEX palette existence.

    cli_checkFiles $PALETTE_HEX

}