--- a/streamlet-examples/qr.cpp Sat Apr 24 20:22:59 2021 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,187 +0,0 @@
-/**
- * Relational pipes
- * Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
- *
- * 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, version 3 of the License.
- *
- * 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 <http://www.gnu.org/licenses/>.
- */
-
-#include <unistd.h>
-
-#include <Magick++.h>
-#include <zbar.h>
-
-#include <relpipe/xmlwriter/XMLWriter.h>
-
-#include "streamlet-common.h"
-
-/**
- * This streamlet extracts QR codes from image files.
- *
- * It provides three attributes:
- * - qr: first QR code found (if any)
- * - qr_count: number of QR codes found
- * - qr_xml: XML containing all QR cpdes found an additional metadata
- *
- */
-class QRStreamlet : public Streamlet {
-private:
-
- const wstring XMLNS = L"tag:globalcode.info,2018:qr:FIXME:final-xmlns"; // FIXME: correct xmlns URI
-
- class Point {
- public:
- int x;
- int y;
- };
-
- class Symbol {
- public:
- int id;
- std::wstring value;
- std::wstring type;
- int x;
- int y;
- int width;
- int height;
- std::vector<Point> polygon;
- };
-
- std::vector<Symbol> findSymbols(std::wstring fileName) {
- std::vector<Symbol> result;
-
- Magick::Image magick(toBytes(fileName));
- int width = magick.columns();
- int height = magick.rows();
- Magick::Blob blob;
- magick.modifyImage();
- magick.write(&blob, "GRAY", 8);
- const void *raw = blob.data();
-
- zbar::Image image(width, height, "Y800", raw, width * height);
- zbar::ImageScanner scanner;
-
- scanner.scan(image);
-
- int id = 0;
- for (zbar::Image::SymbolIterator symbol = image.symbol_begin(); symbol != image.symbol_end(); ++symbol, id++) {
- Symbol s;
-
-
- s.id = id;
- s.type = fromBytes(symbol->get_type_name());
- s.value = fromBytes(symbol->get_data());
-
- int minX = 0;
- int minY = 0;
- int maxX = 0;
- int maxY = 0;
-
- // TODO: return original polygon in XML
- for (int i = 0, locationSize = symbol->get_location_size(); i < locationSize; i++) {
- int x = symbol->get_location_x(i);
- int y = symbol->get_location_y(i);
- minX = minX ? std::min(minX, x) : x;
- minY = minY ? std::min(minY, y) : y;
- maxX = std::max(maxX, x);
- maxY = std::max(maxY, y);
- s.polygon.push_back({x, y});
- }
-
- s.x = minX;
- s.y = minY;
- s.width = maxX - minX;
- s.height = maxY - minY;
-
- result.push_back(s);
- }
-
-
-
- return result;
- }
-
-protected:
-
- std::vector<AttributeMetadata> getOutputAttributesMetadata() override {
- std::vector<AttributeMetadata> oam;
- int i = 0;
- oam.push_back({getAlias(i++, L"qr"), STRING});
- oam.push_back({getAlias(i++, L"qr_count"), INTEGER});
- oam.push_back({getAlias(i++, L"qr_xml"), STRING});
- return oam;
- }
-
- std::vector<OutputAttribute> getOutputAttributes() override {
- bool validInput = false;
- bool hasSymbols = false;
- std::wstring first;
- std::stringstream xml;
-
- std::vector<Symbol> symbols;
- try {
- symbols = findSymbols(getCurrentFile());
- validInput = true;
- } catch (...) {
- // just ignore the errors;
- // the file is probably not an image or we do not have read permissions
- validInput = false;
- }
-
- for (Symbol s : symbols) {
- // TODO: match against pattern (if any)
- first = s.value;
- hasSymbols = true;
- break;
- }
-
- relpipe::xmlwriter::XMLWriter xmlWriter(xml);
- xmlWriter.writeStartElement(L"qr",{L"xmlns", XMLNS});
-
- // TODO: common metadata
- // xmlWriter.writeStartElement(L"source");
- // xmlWriter.writeTextElement(L"height",{}, std::to_wstring(...));
- // xmlWriter.writeTextElement(L"width",{}, std::to_wstring(...));
- // xmlWriter.writeEndElement();
-
- for (Symbol s : symbols) {
- xmlWriter.writeStartElement(L"symbol");
- xmlWriter.writeTextElement(L"value",{}, s.value);
-
- // TODO: well-designed XML schema
- // TODO: synchronize/share common XML parts with relpipe-in-qr
- xmlWriter.writeStartElement(L"rectangular-box");
- xmlWriter.writeTextElement(L"x",{}, std::to_wstring(s.x));
- xmlWriter.writeTextElement(L"y",{}, std::to_wstring(s.y));
- xmlWriter.writeTextElement(L"height",{}, std::to_wstring(s.height));
- xmlWriter.writeTextElement(L"width",{}, std::to_wstring(s.width));
- xmlWriter.writeEndElement();
-
- xmlWriter.writeStartElement(L"polygon");
- for (Point p : s.polygon) xmlWriter.writeEmptyElement(L"point",{L"x", std::to_wstring(p.x), L"y", std::to_wstring(p.y)});
- xmlWriter.writeEndElement();
-
- xmlWriter.writeEndElement();
- }
-
- xmlWriter.writeEndElement();
-
- std::vector<OutputAttribute> oa;
- // TODO: report also validInput (distinguish it from hasSymbols)
- oa.push_back({first, !hasSymbols});
- oa.push_back({std::to_wstring(symbols.size()), false});
- oa.push_back({fromBytes(xml.str()), false});
- return oa;
- }
-};
-
-STREAMLET_RUN(QRStreamlet)