/usr/lib/falcon/img/qrcode.fal is in libfalcon-engine1 0.9.6.9-git20120606-2.
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FALCON - The Falcon Programming Language.
FILE: qrcode.fal
QR-Code library front end.
-----------------------------------------------------------------------------
Author: Giancarlo Niccolai & Giuseppe Greco
Begin:Wed, 27 Oct 2010 21:51:41 +0200
-----------------------------------------------------------------------------
(C) Copyright 2010: the FALCON developers (see list in AUTHORS file)
See LICENSE file for licensing details.
*/
import from self.lib in qr
/*# @main QR-Code generator module.
This module exposes two classes (@a Maker and @a Image) that are meant to
create QR-Code images.
QR-Code is a sort of barcode that can store binary and text information on
paper or screen devices, and can be read back with optical devices.
QR-Code is a patent held by
@link http://www.denso-wave.com/qrcode/index-e.html "Denso wave",
but is released free of charge for everyone to use.
A minimal sample program may be:
@code
import from img.qrcode in qr
// Generates a QR Code image with a utf-8 encded text
img = qr.Maker().text("Hello world", qr.ECL.L, "utf-8")
// Save it as a PNG with 3 pixels per bit and 2 pixels of white border.
img.savePng("hello.png", 3, 2)
@endcodce
The library has support for dumping the image directly to an arbitrary stream
(and so, for example, generating a live document on a web server).
The code of this library is heavily based on
@link "http://fukuchi.org/works/qrencode/index.en.html" "Lib QR Encode".
*/
// workaround to circumvent error in module loader
QrMask = qr.QrMask
/*# Error correction level enumeration.
Sets the trade off between generation complexity and scan readability.
Can be one of:
- **L**: Low correction
- **M**: Medium correction
- **Q**: Medium-high correction
- **H**: High correction.
*/
ECL = qr.QrEcl
/*# QR-Code generator.
This class provides functionality for creating QR-Code images.
The class instance is used to generate one or more @a Image instances,
which are the actual content that can be streamed to a target file or to
an arbitrary stream.
*/
class Maker
/*# Cache directory -- set to nil to disable caching.
*/
cache_dir = nil
/*#
* Encoding of final output.
*/
encoding = "utf-8"
/*# Specifies whether or not to estimate best mask.
*
* Set this attribute to false if performance is an issue.
*/
find_best_mask = true
/*# The number of masks to be checked -- mask ids are generated randomly.
*/
find_from_random = 0
/*# Default mask.
*
* Only used when best mask estimation is disabled.
*/
default_mask = 2
/*# Max width (in pixels) allowed for png images.
*/
png_max_size = 1024
/*# Encodes raw binary data.
@param data The text to be encoded.
@optparam ecl The error correction level (defaults to ECL.L).
@see Maker.ECL
*/
function encodeBin(data, ecl)
input = self._getInput(ecl)
input.append(qr.QrMode.Bin, len(data), data)
return self._encodeInput(input)
end
/*# Encodes a text string.
@param text The text to be encoded.
@optparam ecl The error correction level (defaults to ECL.L).
@optparam encoding Optional text encoding for the final output.
@optparam caseSensitive Set to false to create alphanumeric sequences.
@see Maker.ECL
*/
function encodeText(text, ecl, encoding, caseSensitive)
if encoding == nil: encoding = self.encoding
if caseSensitive == nil: caseSensitive = true
if encoding
text = transcodeTo(text, encoding)
end
input = self._getInput(ecl)
qr.QrSplit.splitStringToInput(text, input, qr.QrMode.Bin, caseSensitive)
return self._encodeInput(input)
end
function encodeNum(data, ecl)
raise qr.QrError(qr.QrError.functionality_not_supported, "encodeNum")
end
function encodeAn(data, ecl)
raise qr.QrError(qr.QrError.functionality_not_supported, "encodeAn")
end
function encodeKanji(data, ecl)
raise qr.QrError(qr.QrError.functionality_not_supported, "encodeKanji")
end
function encodeStruct(data, ecl)
raise qr.QrError(qr.QrError.functionality_not_supported, "encodeStruct")
end
/*# @private */
function _getInput(ecl)
if ecl == nil: ecl = qr.QrEcl.L
if ecl < qr.QrEcl.L or ecl > qr.QrEcl.H
raise qr.QrError(qr.QrError.invalid_ecl, @i"$(ecl) is not supported")
end
return qr.QrInput(0, ecl)
end
/*# @private */
function _encodeInput(input, maskNo)
if maskNo == nil: maskNo = -1
spec = qr.QrSpec()
raw = qr.QrRawCode(input)
version = raw.version
width = spec.getWidth(version)
frame = spec.createFrame(version, self.cache_dir)
if (filler = qr.QrFrameFiller(width, frame)) == nil
raise qr.QrError(qr.QrError.encoding_error, i"error creating frame filler")
end
// cache function references to improve performance
funcGetCode = raw.getCode
funcNext = filler.next
funcSetFrameAt = filler.setFrameAt
for i in [0:raw.dataLength + raw.eccLength]
code = funcGetCode()
bit = 0x80
for j in [0:8]
addr = funcNext()
funcSetFrameAt(addr, 0x02 || ((bit && code) != 0 ? 1 : 0))
bit >>= 1
end
end; raw = nil
for i in [0:spec.getRemainder(version)]
addr = funcNext()
funcSetFrameAt(addr, 0x02)
end
frame = filler.frame
maskObj = qr.QrMask(self)
if maskNo < 0
if self.find_best_mask
masked = maskObj.mask(width, frame, input.ecl)
else
masked = maskObj.createMask(width, frame, self.default_mask % 8, input.ecl)
end
else
masked = maskObj.createMask(width, frame, maskNo, input.ecl)
end
if masked == nil
raise qr.QrError(qr.QrError.encoding_error, i"error masking frame")
end
return Image(version, width, masked, self)
end
end
/*# Class representing a QR-Code image.
@param version The version of this QR-Code image.
@param width The width of this QR-Code image.
@param data Raw binary data.
@param maker The maker that built this Image (used for configuration).
@note This class should not be instanced directly; it should be created
trhough the @a Maker methods.
This class contains the data that can be rendered to an output image.
@prop version (read only) The version of this QR-Code image (indicating its
complexity and data size).
@prop width Size in read points of this image.
*/
class Image(version, width, data, maker)
_version = version
_width = width
_code = data
_maker = maker
_binarized = nil
/*# Saves the image on the given file as a JPG image.
@param filename The file where the image will be saved.
@optparam size Size of dots, in pixels.
@optparam margin Size of the white margin around the image, in pixels.
@raise IoError i/o on error.
*/
function saveJpg(filename, size, margin)
self._saveImage(qr.QrImage.jpg, filename, size, margin)
end
/*# Saves the image on the given file as a PNG image.
@param filename The file where the image will be saved.
@optparam size Size of dots, in pixels.
@optparam margin Size of the white margin around the image, in pixels.
@raise IoError i/o on error.
*/
function savePng(filename, size, margin)
self._saveImage(qr.QrImage.png, filename, size, margin)
end
/*# Writes the image to the given stream as a JPG image.
@param outStream The stream where the image will be written.
@optparam size Size of dots, in pixels.
@optparam margin Size of the white margin around the image, in pixels.
@raise IoError on i/o error.
*/
function writeJpg(outStream, size, margin)
self._writeImage(qr.QrImage.jpg, outStream, size, margin)
end
/*# Writes the image to the given stream as a PNG image.
@param outStream The stream where the image will be written.
@optparam size Size of dots, in pixels.
@optparam margin Size of the white margin around the image, in pixels.
@raise IoError on i/o error.
*/
function writePng(outStream, size, margin)
self._writeImage(qr.QrImage.png, outStream, size, margin)
end
function __get_version()
return self._version
end
function __get_width()
return self._width
end
/*# @private */
function _writeImage(func, outStream, size, margin)
if not self._binarized: self._binarized = qr.QrTools.binarize(self._code)
maxSize = int(self._maker.png_max_size / (len(self._code) + 2 * margin))
func(self._binarized, outStream, min(max(1, size), maxSize), margin)
end
/*# @private */
function _saveImage(func, filename, size, margin)
stream = OutputStream(filename)
try
self._writeImage(func, stream, size, margin)
stream.close()
catch in error
stream.close()
raise error
end
end
end
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