#!/bin/bash
#
# render_doIdentityImageSyslinux.sh -- This function provides
# post-rendering action used to produce syslinux images.
#
# Copyright (C) 2009-2010 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: render_doIdentityImageSyslinux.sh 71 2010-09-18 05:41:11Z al $
# ----------------------------------------------------------------------
function render_doIdentityImageSyslinux {
local FILE=$1
local ACTION="$2"
local OPTIONS=''
# Define 16 colors images default file name prefix.
local PREFIX='-16c'
# Define options using those passed to actions from pre-rendering
# configuration script. These options are applied to pnmremap when
# doing color reduction, so any option available for pnmremap
# command can be passed to renderSyslinux functionality.
OPTIONS=$(echo "$ACTION" | cut -d: -f2-)
# Re-define 16 colors images default file name prefix using
# options as reference. This is useful to differenciate final
# files produced using Floyd-Steinberg dithering and files which
# do not.
if [[ "$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 $OPTION | cut -d'=' -f1)
if [[ "$OPTION" =~ "-(mapfile|verbose)" ]];then
cli_printMessage "`eval_gettext "The \\\$OPTION option is already used."`"
cli_printMessage "$(caller)" "AsToKnowMoreLine"
fi
done
# Define Motif's palette location. We do this relatively.
local PALETTES=/home/centos/artwork/trunk/Identity/Themes/Motifs/$(cli_getThemeName)/Colors
# Define the Netpbm color palette used when reducing colors. This
# palette should be 16 colors based. For more information on this
# see the isolinux documentation.
local PALETTE_PPM=$PALETTES/syslinux.ppm
# Define hexadecimal color information used by ppmtolss16. Color
# information and order used on PALETTE_HEX and PALETTE_PPM should
# match exactly.
local PALETTE_HEX=$PALETTES/syslinux.hex
# Check syslinux's palettes existence: If there is no palette
# assume that this is the first time you are rendering syslinux
# 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 syslinux's 16 colors image (syslinux-splash.png)
# rendering. If there is no palette available, do not apply color
# reduction, show a message, and continue.
cli_checkFiles $PALETTE_PPM
cli_checkFiles $PALETTE_HEX
# Create Netpbm superformat (PNM). PNM file is created from the
# PNG image rendered previously. PNM is a common point for image
# manipulation using Netpbm tools.
cli_printMessage "$FILE.pnm" "AsSavedAsLine"
pngtopnm -verbose \
< $FILE.png \
2>$FILE.log > $FILE.pnm
# Reduce colors. Here we use the Netpbm color $PALETTE_PPM to
# enforce the color position in the image index and the
# Floyd-Steinberg dithering in order to improve color reduction.
cli_printMessage "$FILE${PREFIX}.pnm" "AsSavedAsLine"
pnmremap -verbose -mapfile=$PALETTE_PPM "$OPTIONS" \
< $FILE.pnm \
2>>$FILE.log > $FILE${PREFIX}.pnm
# Create LSS16 image. As specified in isolinux documentation the
# background color should be indexed on position 0 and forground
# in position 7 (see /usr/share/doc/syslinux-X.XX/isolinux.doc).
# This order of colors is specified in $PALETTE_PPM and redefined
# here again for the LSS16 image format. Both $PALETTE_PPM and
# LSS16 color map redefinition ($PALETTE_HEX) should have the same
# colors and index order. PALETTE_HEX should return just one line
# with the color information as described in isolinux
# documentation (i.e #RRGGBB=0 #RRGGBB=1 ... [all values in the
# same line]).
cli_printMessage "$FILE${PREFIX}.lss" "AsSavedAsLine"
PALETTE_HEX=$(cat $PALETTE_HEX | tr "\n" ' ' | tr -s ' ')
ppmtolss16 $PALETTE_HEX \
< $FILE${PREFIX}.pnm \
2>>$FILE.log \
> $FILE${PREFIX}.lss
# Create the PPM image indexed to 16 colors. Also the colormap
# used in the LSS16 image is saved on $FILE.log; this is useful to
# verify the correct order of colors in the image index.
cli_printMessage "$FILE${PREFIX}.ppm" "AsSavedAsLine"
lss16toppm -map < $FILE${PREFIX}.lss \
2>>$FILE.log \
> $FILE${PREFIX}.ppm
# Create the 16 colors PNG image.
cli_printMessage "$FILE${PREFIX}.png" "AsSavedAsLine"
pnmtopng -verbose -palette=$PALETTE_PPM \
< $FILE${PREFIX}.pnm \
2>>$FILE.log \
> $FILE${PREFIX}.png
}