Freeciv

credits convert_png convert_png_legacy mask.png

#!/bin/bash

# Using absolute paths due to bug in Inkscape on macOS

files="$(pwd)/$@"

if test "x$1" = "x-h" || test "x$1" = "x--help" ; then

echo "Usage: $(basename $0) [list of svg-files]"

exit 0

fi

# Renderer: inkscape or sodipodi. Inkscape seems slightly better.

#SODIPODI="sodipodi"

RENDERER="inkscape"

# Target width: 29px is regular, 44px is large (height is then calculated

# automatically).

TARGET_WIDTH=29

TARGET_WIDTH_LARGE=44

SHIELD_WIDTH=14

SHIELD_HEIGHT=14

SHIELD_WIDTH_LARGE=19

SHIELD_HEIGHT_LARGE=19

which $RENDERER >/dev/null \

|| (echo "You need $RENDERER to render the SVG files.")

(which convert >/dev/null && which composite >/dev/null) \

|| (echo "You need ImageMagick to manipulate the images."; err=yes)

for file0 in $files; do

# Generate the regular images

filebase=`echo $file0 | sed 's/.[Ss][Vv][Gg]$//'`

file1="$filebase-1.png"

file2="$filebase-2.png"

file3="$filebase-3.png"

file4="$filebase.png"

echo "Converting $file0 to $file4"

# This is actually necessary for rendering

rm -f $file1 $file2 $file3 $file4

$RENDERER -f "$file0" -w $(($TARGET_WIDTH - 2)) -e "$file1" >/dev/null

# Ugly way to determine width and height. There must be a better way!

SIZE=`identify "$file1" | sed "s/^.*PNG //" | sed "s/ .*\$//"`

WIDTH=`echo $SIZE | sed "s/x.*\$//"`

HEIGHT=`echo $SIZE | sed "s/^.*x//"`

# This complicated code puts a 1-pixel black border around the image.

convert -resize $((2*$WIDTH))x$((2*$HEIGHT)) -fill black -draw "rectangle 0,0 $((2*$WIDTH)),$((2*$HEIGHT))" $file1 $file2

convert -crop $((2+$WIDTH))x$((2+$HEIGHT))+0x0 $file2 $file3

composite -gravity center -compose src-over $file1 $file3 $file4

rm -f $file1 $file2 $file3 "$filebase-4-fs8.png"

file1="$filebase-1.png"

file2="$filebase-2.png"

file3="$filebase-3.png"

file4="$filebase-shield.png"

WIDTH=$(($SHIELD_WIDTH-2))

HEIGHT=$(($SHIELD_HEIGHT-2))

# The following assumes that the drawing has the same dimensions as the page

DRAWING_WIDTH=$($RENDERER -f $file0 -W)

DRAWING_HEIGHT=$($RENDERER -f $file0 -H)

X0=$(awk -v drawing_width=${DRAWING_WIDTH} 'BEGIN { print int((drawing_width / 6) + 0.5) }')

X1=$(awk -v x0=${X0} 'BEGIN{ print int((x0 * 5) + 0.5) }')

Y0=0

Y1=$(awk -v drawing_height=${DRAWING_HEIGHT} 'BEGIN { print int(drawing_height + 0.5) }')

AREA=$X0":"$Y0":"$X1":"$Y1

$RENDERER -f $file0 -w $WIDTH -h $HEIGHT -e $file1 -a=$AREA > /dev/null

composite -gravity center -compose src-over $file1 mask.png $file2

composite -gravity center -compose src-over mask.png $file2 $file3

convert -transparent magenta $file3 $file4

rm -f $file1 $file2 $file3 "$filebase-4-fs8.png"

# Generate the large images

filebase=`echo $file0 | sed 's/.[Ss][Vv][Gg]$//'`

file1="$filebase-1.png"

file2="$filebase-2.png"

file3="$filebase-3.png"

file4="$filebase-large.png"

echo "Converting $file0 to $file4"

# This is actually necessary for rendering

rm -f $file1 $file2 $file3 $file4

$RENDERER -f "$file0" -w $(($TARGET_WIDTH_LARGE - 2)) -e "$file1" >/dev/null

# Ugly way to determine width and height. There must be a better way!

SIZE=`identify "$file1" | sed "s/^.*PNG //" | sed "s/ .*\$//"`

WIDTH=`echo $SIZE | sed "s/x.*\$//"`

HEIGHT=`echo $SIZE | sed "s/^.*x//"`

# This complicated code puts a 1-pixel black border around the image.

convert -resize $((2*$WIDTH))x$((2*$HEIGHT)) -fill black -draw "rectangle 0,0 $((2*$WIDTH)),$((2*$HEIGHT))" $file1 $file2

convert -crop $((2+$WIDTH))x$((2+$HEIGHT))+0x0 $file2 $file3

composite -gravity center -compose src-over $file1 $file3 $file4

rm -f $file1 $file2 $file3 "$filebase-4-fs8.png"

file1="$filebase-1.png"

file2="$filebase-2.png"

file3="$filebase-3.png"

file4="$filebase-shield-large.png"

WIDTH=$(($SHIELD_WIDTH_LARGE-2))

HEIGHT=$(($SHIELD_HEIGHT_LARGE-2))

# The following assumes that the drawing has the same dimensions as the page

DRAWING_WIDTH=$($RENDERER -f $file0 -W)

DRAWING_HEIGHT=$($RENDERER -f $file0 -H)

X0=$(awk -v drawing_width=${DRAWING_WIDTH} 'BEGIN { print int((drawing_width / 6) + 0.5) }')

X1=$(awk -v x0=${X0} 'BEGIN{ print int((x0 * 5) + 0.5) }')

Y0=0

Y1=$(awk -v drawing_height=${DRAWING_HEIGHT} 'BEGIN { print int(drawing_height + 0.5) }')

AREA=$X0":"$Y0":"$X1":"$Y1

$RENDERER -f $file0 -w $WIDTH -h $HEIGHT -e $file1 -a=$AREA > /dev/null

composite -gravity center -compose src-over $file1 mask-large.png $file2

composite -gravity center -compose src-over mask-large.png $file2 $file3

convert -transparent magenta $file3 $file4

rm -f $file1 $file2 $file3 "$filebase-4-fs8.png"

done

There is two versions of the conversion script. ./convert_png is a

new version that is compatible with modern versions of inkscape.

The old version ./convert_png_legacy is the version that has

been used to make any flag conversions before April 2021; at the time

of writing all png-files in data/flags are still ones created with it.