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<?php
/**
* escpos-php, a Thermal receipt printer library, for use with
* ESC/POS compatible printers.
*
* Copyright (c) 2014-2015 Michael Billington <michael.billington@gmail.com>,
* incorporating modifications by:
* - Roni Saha <roni.cse@gmail.com>
* - Gergely Radics <gerifield@ustream.tv>
* - Warren Doyle <w.doyle@fuelled.co>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Print buffers manage newlines and character encoding for the target printer.
* They are used as a swappable component: text or image-based output.
*
* - Text output (EscposPrintBuffer) is the fast default, and is recommended for
* most people, as the text output can be more directly manipulated by ESC/POS
* commands.
* - Image output (ImagePrintBuffer) is designed to accept more encodings than the
* physical printer supports, by rendering the text to small images on-the-fly.
* This takes a lot more CPU than sending text, but is necessary for some users.
* - If your use case fits outside these, then a further speed/flexibility trade-off
* can be made by printing directly from generated HTML or PDF.
*/
interface PrintBuffer {
/**
* Cause the buffer to send any partial input and wait on a newline.
* If the printer is already on a new line, this does nothing.
*/
function flush();
/**
* Used by Escpos to check if a printer is set.
*/
function getPrinter();
/**
* Used by Escpos to hook up one-to-one link between buffers and printers.
*
* @param Escpos $printer New printer
*/
function setPrinter(Escpos $printer = null);
/**
* Accept UTF-8 text for printing.
*
* @param string $text Text to print
*/
function writeText($text);
/**
* Accept 8-bit text in the current encoding and add it to the buffer.
*
* @param string $text Text to print, already the target encoding.
*/
function writeTextRaw($text);
}
?>