#!/bin/bash -e
# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Render a text file into a bitmap. Files named '*.txt' are small font, those
# nameed '*.TXT' are large font.
#

# Image parameters
bg='#607c91'
bluecolor='#9ccaec'
bluefont="Helvetica"
bluepointsize=22
whitefont="Helvetica"
whitepointsize=40


tmpdir=$(mktemp -d /tmp/tmp.bmp.XXXXXX)
trap "rm -rf $tmpdir" EXIT
label_file="${tmpdir}/label.txt"

for txtfile in $*; do
  bmpfile="${txtfile%.*}".bmp
  # Must strip off the leading U+FEFF byte order mark (bytes 0xEF,0xBB,0xBF) of
  # each file before I can pass it to imagemagick. Chomp any leading/trailing
  # whitespace too.
  perl -p -e 'BEGIN{ $/=undef; }' \
    -e 'if (substr($_,0,3) eq "\xef\xbb\xbf") { substr($_, 0, 3) = ""; }' \
    -e 's/^\s+//s;' -e 's/\s+$//s;' \
    "$txtfile" > "$label_file"

  case "$txtfile" in
    *.txt)
      convert \
        -background "$bg" -fill "$bluecolor" \
        -font "$bluefont" -pointsize "$bluepointsize" \
        -bordercolor "$bg" -border 0x3 -gravity Center \
        -interline-spacing 3 \
        label:'@'"$label_file" \
        -resize '120%x100' \
        -colors 256 -compress none -alpha off \
        "$bmpfile"
      echo "wrote $bmpfile"
      ;;
    *.TXT)
      convert \
        -background "$bg" -fill "white" \
        -font "$whitefont" -pointsize "$whitepointsize" \
        -bordercolor "$bg" -border 0x10 -gravity Center \
        -interline-spacing 5 \
        label:'@'"$label_file" \
        -resize '120%x100' \
        -colors 256 -compress none -alpha off \
        "$bmpfile"
      echo "wrote $bmpfile"
      ;;
    *)
      echo "Ignoring $txtfile. Filname should end with .txt or .TXT"
      ;;
  esac
done