ocr

1 files changed, 181 insertions, 0 deletions

diff --git a/web/share/js/kvm/ocr.js b/web/share/js/kvm/ocr.js
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+++ b/web/share/js/kvm/ocr.js
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+/*****************************************************************************
+#                                                                            #
+#    KVMD - The main PiKVM daemon.                                           #
+#                                                                            #
+#    Copyright (C) 2018-2022  Maxim Devaev <[email protected]>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+"use strict";
+
+
+import {tools, $} from "../tools.js";
+import {wm} from "../wm.js";
+
+
+export function Ocr(__getGeometry) {
+	var self = this;
+
+	/************************************************************************/
+
+	var __start_pos = null;
+	var __end_pos = null;
+	var __selection = null;
+
+	var __init__ = function() {
+		tools.el.setOnClick($("stream-ocr-button"), function() {
+			__resetSelection();
+			wm.showWindow($("stream-window"));
+			wm.showWindow($("stream-ocr-window"));
+		});
+
+		$("stream-ocr-lang-selector").addEventListener("change", function() {
+			tools.storage.set("stream.ocr.lang", $("stream-ocr-lang-selector").value);
+		});
+
+		$("stream-ocr-window").addEventListener("blur", __resetSelection);
+		$("stream-ocr-window").addEventListener("resize", __resetSelection);
+		$("stream-ocr-window").close_hook = __resetSelection;
+
+		$("stream-ocr-window").onkeyup = function(event) {
+			event.preventDefault();
+			if (event.code === "Enter") {
+				__recognizeSelection();
+				wm.closeWindow($("stream-ocr-window"));
+			} else if (event.code === "Escape") {
+				wm.closeWindow($("stream-ocr-window"));
+			}
+		};
+
+		$("stream-ocr-window").onmousedown = __startSelection;
+		$("stream-ocr-window").onmousemove = __changeSelection;
+		$("stream-ocr-window").onmouseup = __endSelection;
+	};
+
+	/************************************************************************/
+
+	self.setState = function(state) {
+		let enabled = (state && state.ocr.enabled && navigator.clipboard && !tools.browser.is_ios);
+		if (enabled) {
+			let selected = tools.storage.get("stream.ocr.lang", state.ocr.langs["default"]);
+			let html = "";
+			for (let variant of state.ocr.langs.available) {
+				html += `<option value=${variant} ${variant === selected ? "selected" : ""}>${variant}</option>`;
+			}
+			$("stream-ocr-lang-selector").innerHTML = html;
+		}
+		tools.feature.setEnabled($("stream-ocr"), enabled);
+		$("stream-ocr-led").className = (enabled ? "led-gray" : "hidden");
+	};
+
+	var __startSelection = function(event) {
+		if (__start_pos === null) {
+			tools.hidden.setVisible($("stream-ocr-selection"), false);
+			__start_pos = __getGlobalPosition(event);
+			__end_pos = null;
+		}
+	};
+
+	var __changeSelection = function(event) {
+		if (__start_pos !== null) {
+			__end_pos = __getGlobalPosition(event);
+			let width = Math.abs(__start_pos.x - __end_pos.x);
+			let height = Math.abs(__start_pos.y - __end_pos.y);
+			let el_selection = $("stream-ocr-selection");
+			el_selection.style.left = Math.min(__start_pos.x, __end_pos.x) + "px";
+			el_selection.style.top = Math.min(__start_pos.y, __end_pos.y) + "px";
+			el_selection.style.width = width + "px";
+			el_selection.style.height = height + "px";
+			tools.hidden.setVisible(el_selection, (width > 1 || height > 1));
+		}
+	};
+
+	var __endSelection = function(event) {
+		__changeSelection(event);
+		let el_selection = $("stream-ocr-selection");
+		let ok = (
+			el_selection.offsetWidth > 1 && el_selection.offsetHeight > 1
+			&& __start_pos !== null && __end_pos !== null
+		);
+		tools.hidden.setVisible(el_selection, ok);
+		if (ok) {
+			let rect = $("stream-box").getBoundingClientRect();
+			let rel_left = Math.min(__start_pos.x, __end_pos.x) - rect.left;
+			let rel_right = Math.max(__start_pos.x, __end_pos.x) - rect.left;
+			let rel_top = Math.min(__start_pos.y, __end_pos.y) - rect.top;
+			let rel_bottom = Math.max(__start_pos.y, __end_pos.y) - rect.top;
+			let geo = __getGeometry();
+			__selection = {
+				left: tools.remap(rel_left, geo.x, geo.width, 0, geo.real_width),
+				right: tools.remap(rel_right, geo.x, geo.width, 0, geo.real_width),
+				top: tools.remap(rel_top, geo.y, geo.height, 0, geo.real_height),
+				bottom: tools.remap(rel_bottom, geo.y, geo.height, 0, geo.real_height),
+			};
+		} else {
+			__selection = null;
+		}
+		__start_pos = null;
+		__end_pos = null;
+	};
+
+	var __getGlobalPosition = function(event) {
+		let rect = $("stream-box").getBoundingClientRect();
+		let geo = __getGeometry();
+		return {
+			x: Math.min(Math.max(event.clientX, rect.left + geo.x), rect.right - geo.x),
+			y: Math.min(Math.max(event.clientY, rect.top + geo.y), rect.bottom - geo.y),
+		};
+	};
+
+	var __resetSelection = function() {
+		tools.hidden.setVisible($("stream-ocr-selection"), false);
+		__start_pos = null;
+		__end_pos = null;
+		__selection = null;
+	};
+
+	var __recognizeSelection = function() {
+		tools.el.setEnabled($("stream-ocr-button"), false);
+		tools.el.setEnabled($("stream-ocr-lang-selector"), false);
+		$("stream-ocr-led").className = "led-yellow-rotating-fast";
+
+		let lang = $("stream-ocr-lang-selector").value;
+		let url = `/api/streamer/snapshot?ocr=1&ocr_lang=${lang}`;
+		url += `&ocr_left=${__selection.left}&ocr_top=${__selection.top}`;
+		url += `&ocr_right=${__selection.right}&ocr_bottom=${__selection.bottom}`;
+
+		let http = tools.makeRequest("GET", url, function() {
+			if (http.readyState === 4) {
+				if (http.status === 200) {
+					navigator.clipboard.writeText(http.responseText).then(function() {
+						wm.info("The text is copied to the clipboard");
+					}, function() {
+						wm.error("Can't copy text to the clipboard");
+					});
+				} else {
+					wm.error("OCR error:<br>", http.responseText);
+				}
+
+				tools.el.setEnabled($("stream-ocr-button"), true);
+				tools.el.setEnabled($("stream-ocr-lang-selector"), true);
+				$("stream-ocr-led").className = "led-gray";
+			}
+		});
+	};
+
+	__init__();
+}