Blame Scripts/Functions/Render/render_doGrub.sh

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#!/bin/bash
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#
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# render_doGrub.sh -- This function provides post-rendition
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# action used to produce GRUB images.
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#
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# Copyright (C) 2009-2011 Alain Reguera Delgado
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# 
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of the
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# License, or (at your option) any later version.
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# 
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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# USA.
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# 
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# ----------------------------------------------------------------------
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# $Id$
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# ----------------------------------------------------------------------
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function render_doGrub {
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    # Define number of colors the images will be produced on.
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    local COLOR_NUMBER='14'
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    # Define options using those passed to actions from pre-rendition
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    # configuration script. These options are applied to pnmremap when
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    # doing color reduction, so any option available for pnmremap
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    # command can be passed to renderSyslinux functionality.
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    local OPTIONS=$(render_getConfigOption "$ACTION" '2-')
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    # Check options passed to action. This is required in order to
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    # aviod using options used already in this script. For example
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    # -verbose and -mapfile options.
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    for OPTION in $OPTIONS;do
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        # Remove anything after equal sign inside option.
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        OPTION=$(echo -n $OPTION | cut -d'=' -f1)
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        if [[ "$OPTION" =~ "-(mapfile|verbose)" ]];then
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            cli_printMessage "`eval_gettext "The \\\$OPTION option is already used."`"
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            cli_printMessage "${FUNCDIRNAM}" "AsToKnowMoreLine"
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        fi
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    done
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    # Define file name prefix.
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    local PREFIX="-${COLOR_NUMBER}c"
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    # Redefine file name prefix using options as reference. This is
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    # useful to differenciate final files produced using
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    # Floyd-Steinberg dithering and files which are not.
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    if [[ "$OPTIONS" =~ '-floyd' ]];then
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        PREFIX="${PREFIX}-floyd"
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    fi
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    # Define theme-specific palettes directory. 
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    local PALETTES=$(cli_getRepoTLDir)/Identity/Themes/Motifs/$(cli_getPathComponent '--theme')/Palettes
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    # Define absolute path to GPL palette.  This palettes should have
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    # 14 colors only. For more information on this see the GRUB's
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    # documentation.
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    local PALETTE_GPL=${PALETTES}/grub.gpl
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    # Verify GPL palette existence.
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    cli_checkFiles $PALETTE_GPL 'f'
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    # Define absolute path to PPM palette. The PPM palette is built
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    # from source palette (PALETTE_GPL) and provides the color
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    # information understood by `ppmremap', the program used to
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    # produce images in a specific amount of colors.
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    local PALETTE_PPM=$(cli_getTemporalFile "grub.ppm")
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    # Create image in Netpbm superformat (PNM). The PNM image file is
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    # created from the PNG image rendered previously as centos-art
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    # base-rendition output. The PNM image is an intermediate format
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    # used to manipulate images through Netpbm tools.
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    cli_printMessage "${FILE}.pnm" "AsSavedAsLine"
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    pngtopnm -verbose \
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        < ${FILE}.png 2>${FILE}.log > ${FILE}.pnm
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    # Print the path to GPL palette.
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    cli_printMessage "$PALETTE_GPL" 'AsPaletteLine'
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    # Create PPM palette using GPL palette.
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    render_convertGplToPpm "$PALETTE_GPL" "$PALETTE_PPM" "$COLOR_NUMBER"
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    # Reduce colors as specified in PPM palette.  Here we use the PPM
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    # palette to enforce the color position in the image index and the
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    # Floyd-Steinberg dithering in order to improve color reduction.
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    cli_printMessage "${FILE}${PREFIX}.ppm" "AsSavedAsLine"
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    pnmremap -verbose -mapfile=$PALETTE_PPM $OPTIONS \
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        < ${FILE}.pnm 2>>${FILE}.log > ${FILE}${PREFIX}.ppm
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    # Remove PPM palette. It is no longer needed.
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    if [[ -f ${PALETTE_PPM} ]];then
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        rm $PALETTE_PPM
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    fi
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    # Create the 14 colors xpm.gz file.
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    cli_printMessage "${FILE}${PREFIX}.xpm.gz" "AsSavedAsLine"
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    ppmtoxpm \
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        < ${FILE}${PREFIX}.ppm 2>>${FILE}.log > ${FILE}.xpm \
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        && gzip --force ${FILE}.xpm \
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        && mv ${FILE}.xpm.gz ${FILE}${PREFIX}.xpm.gz
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}