Blame Scripts/Bash/centos-art/Functions/Identity/identity_renderSyslinux.sh

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#!/bin/bash
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#
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# identity_renderSyslinux.sh -- This function provides post-rendition
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# action used to produce syslinux 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 identity_renderSyslinux {
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    # Define 16 colors images default file name prefix.
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    local PREFIX='-16c'
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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=$(identity_getConfigOption "$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 $OPTION | cut -d'=' -f1)
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        if [[ "$OPTION" =~ "-(mapfile|verbose)" ]];then
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            cli_printMessage "`eval_gettext "The \\\$OPTION option is already used."`"
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            cli_printMessage "$(caller)" "AsToKnowMoreLine"
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        fi
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    done
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    # Re-define 16 colors images default file name prefix using
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    # options as reference. This is useful to differenciate final
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    # files produced using Floyd-Steinberg dithering and final files
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    # which are not.
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    if [[ "$OPTIONS" =~ '-floyd' ]];then
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        PREFIX="${PREFIX}-floyd"
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    fi
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    # Define motif's palette location.
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    local PALETTES=$(cli_getRepoTLDir)/Identity/Themes/Motifs/$(cli_getPathComponent '--theme')/Colors
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    # Define the Netpbm color palette used when reducing colors. This
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    # palette should be 16 colors based. For more information on this
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    # see the isolinux documentation.
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    local PALETTE_PPM=$PALETTES/syslinux.ppm
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    # Define hexadecimal color information used by ppmtolss16.  Color
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    # information and order used on PALETTE_HEX and PALETTE_PPM should
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    # match exactly.
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    local PALETTE_HEX=$PALETTES/syslinux.hex
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    # Print which palette of colors centos-art.sh script is using to
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    # produce grub content. This is relevant in order to know if we
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    # are using whether trunk or branches palette of colors.
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    cli_printMessage "$PALETTE_PPM" 'AsPaletteLine'
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    cli_printMessage "$PALETTE_HEX" 'AsPaletteLine'
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    # Check syslinux's palettes existence:  If there is no palette
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    # assume that this is the first time you are rendition syslinux
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    # images. If that is the case the script will provide you with the
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    # PNG format which should be used as base to produce (using GIMP)
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    # the .gpl palette.  The .gpl palette information is used to
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    # produced (using GIMP) the colormap (.ppm) which is used to
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    # automate the syslinux's 16 colors image (syslinux-splash.png)
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    # rendition.  If there is no palette available, do not apply color
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    # reduction, show a message, and continue.
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    cli_checkFiles $PALETTE_PPM
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    cli_checkFiles $PALETTE_HEX
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    # Create Netpbm superformat (PNM). PNM file is created from the
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    # PNG image rendered previously. PNM is a common point for image
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    # manipulation using Netpbm tools.
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    cli_printMessage "${FILE}.pnm" "AsSavedAsLine"
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    pngtopnm -verbose \
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        < ${FILE}.png 2>${FILE}.log > ${FILE}.pnm
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    # Reduce colors. Here we use the Netpbm color $PALETTE_PPM to
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    # enforce the color position in the image index and the
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    # Floyd-Steinberg dithering in order to improve color reduction.
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    cli_printMessage "${FILE}${PREFIX}.pnm" "AsSavedAsLine"
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    pnmremap -verbose -mapfile=$PALETTE_PPM $OPTIONS \
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        < ${FILE}.pnm 2>> ${FILE}.log > ${FILE}${PREFIX}.pnm
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    # Create LSS16 image. As specified in isolinux documentation the
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    # background color should be indexed on position 0 and forground
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    # in position 7 (see /usr/share/doc/syslinux-X.XX/isolinux.doc).
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    # This order of colors is specified in $PALETTE_PPM and redefined
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    # here again for the LSS16 image format. Both $PALETTE_PPM and
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    # LSS16 color map redefinition ($PALETTE_HEX) should have the same
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    # colors and index order. PALETTE_HEX should return just one line
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    # with the color information as described in isolinux
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    # documentation (i.e #RRGGBB=0 #RRGGBB=1 ... [all values in the
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    # same line]).
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    cli_printMessage "${FILE}${PREFIX}.lss" "AsSavedAsLine"
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    PALETTE_HEX=$(cat $PALETTE_HEX | tr "\n" ' ' | tr -s ' ')
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    ppmtolss16 $PALETTE_HEX \
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        < ${FILE}${PREFIX}.pnm 2>>${FILE}.log > ${FILE}${PREFIX}.lss
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    # Create the PPM image indexed to 16 colors. Also the colormap
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    # used in the LSS16 image is saved on ${FILE}.log; this is useful to
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    # verify the correct order of colors in the image index.
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    cli_printMessage "${FILE}${PREFIX}.ppm" "AsSavedAsLine"
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    lss16toppm -map \
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        < ${FILE}${PREFIX}.lss 2>>${FILE}.log > ${FILE}${PREFIX}.ppm
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    # Create the 16 colors PNG image.
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    cli_printMessage "${FILE}${PREFIX}.png" "AsSavedAsLine"
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    pnmtopng -verbose -palette=$PALETTE_PPM \
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        < ${FILE}${PREFIX}.pnm 2>>${FILE}.log > ${FILE}${PREFIX}.png
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}