Blame Scripts/Functions/Render/Backends/Svg/svg_convertPngToGrub.sh

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#!/bin/bash
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#
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# svg_convertPngToGrub.sh -- This function provides post-rendition
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# action used to produce GRUB images.
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#
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# Initially, the color information is defined with GIMP (The GNU Image
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# Manipulation Program) as a `.gpl' palette of color. This palette of
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# colors contains 14 colors only and is saved in a file named
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# `grub.gpl.  The `grub.gpl' file is used to build the `grub.ppm' file
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# which provide the color information needed to reduce the full color
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# PNG image, produced as result of SVG base-rendition, to the amount
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# of colors specified (i.e., 14 colors). Later, with the 14 color PNG
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# image already created, the `grub.ppm' file is used to build the
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# `splash.xpm.gz' file.
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#
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# In order for this function to work, the `grub.gpl' file should have
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# a format similar to the following:
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#
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#   GIMP Palette
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#   Name: CentOS-TreeFlower-4-Syslinux
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#   Columns: 14
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#   #
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#    32  76 141	204c8d
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#    36  82 146	245292
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#    52  93 152	345d98
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#    72 108 162	486ca2
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#   102 131 176	6683b0
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#   126 153 190	7e99be
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#   146 170 200	92aac8
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#   161 182 209	a1b6d1
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#   182 199 219	b6c7db
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#   202 214 228	cad6e4
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#   221 230 238	dde6ee
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#   235 241 245	ebf1f5
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#   246 251 254	f6fbfe
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#   254 255 252	fefffc
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#
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# Copyright (C) 2009, 2010, 2011 The CentOS Artwork SIG
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at
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# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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# ----------------------------------------------------------------------
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# $Id$
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# ----------------------------------------------------------------------
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function svg_convertPngToGrub {
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    # Define number of colors the images will be produced on.
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    local COLORS='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."`" --as-error-line
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        fi
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    done
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    # Define file name prefix.
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    local PREFIX="-${COLORS}c"
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    # Redefine file name prefix using options as reference. This is
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    # useful to differenciate final files produced using
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    # Floyd-Steinberg dithering and files which are not.
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    if [[ "$OPTIONS" =~ '-floyd' ]];then
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        PREFIX="${PREFIX}-floyd"
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    fi
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    # Define absolute path to GPL palette.  This palettes should have
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    # 14 colors only. For more information on this see the GRUB's
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    # documentation.
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    local PALETTE_GPL=${MOTIF_DIR}/Palettes/grub.gpl
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    # Verify GPL palette existence. If it doesn't exist copy the one
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    # provided by the design model through subversion (to keep track
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    # of the change) and expand translation markers in the copied
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    # instance.
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    if [[ ! -f $PALETTE_GPL ]];then
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        svn cp ${MODEL_BASEDIR}/${FLAG_THEME_MODEL}/Palettes/grub.gpl ${PALETTE_GPL}
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        cli_replaceTMarkers ${PALETTE_GPL}
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    fi
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    # Define absolute path to PPM palette. The PPM palette is built
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    # from source palette (PALETTE_GPL) and provides the color
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    # information understood by `ppmremap', the program used to
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    # produce images in a specific amount of colors.
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    local PALETTE_PPM=$(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" --as-savedas-line
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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" --as-palette-line
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    # Create PPM palette using GPL palette.
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    ${RENDER_BACKEND}_convertGplToPpm "$PALETTE_GPL" "$PALETTE_PPM" "$COLORS"
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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" --as-savedas-line
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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" --as-savedas-line
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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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}