#!/bin/bash

#

# svg_convertGplToPpm.sh -- This function takes one palette produced

# by Gimp (e.g., syslinux.gpl) as input and outputs one PPM file based

# on it (e.g., syslinux.ppm).

#

# 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_convertGplToPpm {

    local -a FILES

    local COUNT=0

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

    # retrive color information from.

    local PALETTE_GPL="$1"

    # Define path to PPM palette. This is the .ppm file we'll save

    # color information to.

    local PALETTE_PPM="$2"

    # Define the number of colors this function should return.

    local NUMBER="$3"

    # Define list of colors from GPL palette.

    local COLOR=''

    local COLORS=$(svg_getColors "$PALETTE_GPL" --head=$NUMBER --tail=$NUMBER --format='rrrggbb')

    # Verify amount of colors in the list of colors.

    svg_checkColorAmount "$COLORS" "$NUMBER"

    # Verify format of colors.

    svg_checkColorFormats $COLORS --format='rrggbb'

    # Create temporal images (of 1x1 pixel each) to store each color

    # retrived from Gimp's palette. 

    for COLOR in $COLORS;do

        FILES[$COUNT]=$(cli_getTemporalFile ${COUNT}.ppm)

        ppmmake $COLOR 1 1 > ${FILES[$COUNT]}

        COUNT=$(($COUNT + 1))

    done

    # Concatenate each temporal image from left to right to create the

    # PPM file.

    pnmcat -lr ${FILES[*]} > $PALETTE_PPM

    # Remove temporal images used to build the PPM palette file.

    rm ${FILES[*]}

    # Verify PPM palette existence.

    cli_checkFiles "$PALETTE_PPM"

}