#!/bin/bash

#

# render_doGrub.sh -- This function provides post-rendition

# action used to produce GRUB images.

#

# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307

# USA.

# 

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

# $Id$

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

function render_doGrub {

    # Define 16 colors images default file name prefix.

    local PREFIX='-14c'

    # Define options using those passed to actions from pre-rendition

    # configuration script. These options are applied to pnmremap when

    # doing color reduction, so any option available for pnmremap

    # command can be passed to renderSyslinux functionality.

    local OPTIONS=$(render_getConfigOption "$ACTION" '2-')

    # Re-define 16 colors images default file name prefix using

    # options as reference. This is useful to differenciate final

    # files produced using Floyd-Steinberg dithering and files which

    # do not.

    if [[ "$OPTIONS" =~ '-floyd' ]];then

        PREFIX="${PREFIX}-floyd"

    fi

    # Check options passed to action. This is required in order to

    # aviod using options used already in this script. For example

    # -verbose and -mapfile options.

    for OPTION in $OPTIONS;do

        # Remove anything after equal sign inside option.

        OPTION=$(echo -n $OPTION | cut -d'=' -f1)

        if [[ "$OPTION" =~ "-(mapfile|verbose)" ]];then

            cli_printMessage "`eval_gettext "The \\\$OPTION option is already used."`"

            cli_printMessage "$(caller)" "AsToKnowMoreLine"

        fi

    done

    # Define motif's palette location.

    local PALETTES=$(cli_getRepoTLDir)/Identity/Themes/Motifs/$(cli_getPathComponent '--theme')/Colors

    # Define the Netpbm color palettes used when reducing colors.

    # These palettes should be 14 colors based. For more information

    # on this see the GRUB's documentation.

    local PALETTE_PPM=$PALETTES/grub.ppm

    # Print which palette of colors centos-art.sh script is using to

    # produce grub content. This is relevant in order to know if we

    # are using whether trunk or branches palette of colors.

    cli_printMessage "$PALETTE_PPM" 'AsPaletteLine'

    # Check GRUB's palettes existence:  If there is no palette assume

    # that this is the first time you are rendition GRUB images. If

    # that is the case the script will provide you with the PNG format

    # which should be used as base to produce (using GIMP) the .gpl

    # palette.  The .gpl palette information is used to produced

    # (using GIMP) the colormap (.ppm) which is used to automate the

    # GRUB's 14 colors image (splash.png) rendition.  If there is no

    # palette available, do not apply color reduction, show a message,

    # and continue.

    cli_checkFiles $PALETTE_PPM

    # Create Netpbm superformat (PNM). PNM file is created from the

    # PNG image rendered previously. PNM is a common point for image

    # manipulation using Netpbm tools.

    cli_printMessage "${FILE}.pnm" "AsSavedAsLine"

    pngtopnm -verbose \

        < ${FILE}.png 2>${FILE}.log > ${FILE}.pnm

    # Reduce colors as specified in ppm palette of colors.

    cli_printMessage "${FILE}${PREFIX}.ppm" "AsSavedAsLine"

    pnmremap -verbose -mapfile=$PALETTE_PPM $OPTIONS \

        < ${FILE}.pnm 2>>${FILE}.log > ${FILE}${PREFIX}.ppm

    # Create the 14 colors xpm.gz file.

    cli_printMessage "${FILE}${PREFIX}.xpm.gz" "AsSavedAsLine"

    ppmtoxpm \

        < ${FILE}${PREFIX}.ppm 2>>${FILE}.log > ${FILE}.xpm \

        && gzip --force ${FILE}.xpm \

        && mv ${FILE}.xpm.gz ${FILE}${PREFIX}.xpm.gz

}