#!/bin/bash
#
# render_svg_convertPngToGrub.sh -- This function provides
# post-rendition action used to produce GRUB images.
#
# 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 render_svg_convertPngToGrub {
# Define number of colors the images will be produced on.
local COLORS='14'
# 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-')
# 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."`" --as-error-line
fi
done
# Define file name prefix.
local PREFIX="-${COLORS}c"
# Redefine file name prefix using options as reference. This is
# useful to differenciate final files produced using
# Floyd-Steinberg dithering and files which are not.
if [[ "$OPTIONS" =~ '-floyd' ]];then
PREFIX="${PREFIX}-floyd"
fi
# Define absolute path to GPL palette. This palettes should have
# 14 colors only. For more information on this see the GRUB's
# documentation.
local PALETTE_GPL=${MOTIF_DIR}/Palettes/grub.gpl
# Verify GPL palette existence. If it doesn't exist copy the one
# provided by the design model and expand translation markers in
# it.
if [[ ! -f $PALETTE_GPL ]];then
cp ${MODEL_BASEDIR}/${FLAG_THEME_MODEL}/Palettes/grub.gpl ${PALETTE_GPL}
cli_replaceTMarkers ${PALETTE_GPL}
fi
# Define absolute path to PPM palette. The PPM palette is built
# from source palette (PALETTE_GPL) and provides the color
# information understood by `ppmremap', the program used to
# produce images in a specific amount of colors.
local PALETTE_PPM=$(cli_getTemporalFile "grub.ppm")
# Create image in Netpbm superformat (PNM). The PNM image file is
# created from the PNG image rendered previously as centos-art
# base-rendition output. The PNM image is an intermediate format
# used to manipulate images through Netpbm tools.
cli_printMessage "${FILE}.pnm" --as-savedas-line
pngtopnm -verbose \
< ${FILE}.png 2>${FILE}.log > ${FILE}.pnm
# Print the path to GPL palette.
cli_printMessage "$PALETTE_GPL" --as-palette-line
# Create PPM palette using GPL palette.
render_svg_convertGplToPpm "$PALETTE_GPL" "$PALETTE_PPM" "$COLORS"
# Reduce colors as specified in PPM palette. Here we use the PPM
# palette to enforce the color position in the image index and the
# Floyd-Steinberg dithering in order to improve color reduction.
cli_printMessage "${FILE}${PREFIX}.ppm" --as-savedas-line
pnmremap -verbose -mapfile=$PALETTE_PPM $OPTIONS \
< ${FILE}.pnm 2>>${FILE}.log > ${FILE}${PREFIX}.ppm
# Remove PPM palette. It is no longer needed.
if [[ -f ${PALETTE_PPM} ]];then
rm $PALETTE_PPM
fi
# Create the 14 colors xpm.gz file.
cli_printMessage "${FILE}${PREFIX}.xpm.gz" --as-savedas-line
ppmtoxpm \
< ${FILE}${PREFIX}.ppm 2>>${FILE}.log > ${FILE}.xpm \
&& gzip --force ${FILE}.xpm \
&& mv ${FILE}.xpm.gz ${FILE}${PREFIX}.xpm.gz
}