1 /*
2 * Copyright 2016 Nu-book Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "ReadBarcode.h"
18
19 #include <string>
20 #include <memory>
21 #include <stdexcept>
22 #include <emscripten/bind.h>
23
24 #define STB_IMAGE_IMPLEMENTATION
25 #include "stb_image.h"
26
27 struct ReadResult
28 {
29 std::string format;
30 std::wstring text;
31 std::string error;
32 ZXing::Position position;
33 };
34
readBarcodeFromImage(int bufferPtr,int bufferLength,bool tryHarder,std::string format)35 ReadResult readBarcodeFromImage(int bufferPtr, int bufferLength, bool tryHarder, std::string format)
36 {
37 using namespace ZXing;
38 try {
39 DecodeHints hints;
40 hints.setTryHarder(tryHarder);
41 hints.setTryRotate(tryHarder);
42 hints.setFormats(BarcodeFormatsFromString(format));
43
44 int width, height, channels;
45 std::unique_ptr<stbi_uc, void (*)(void*)> buffer(
46 stbi_load_from_memory(reinterpret_cast<const unsigned char*>(bufferPtr), bufferLength, &width, &height,
47 &channels, 4),
48 stbi_image_free);
49 if (buffer == nullptr) {
50 return { "", L"", "Error loading image" };
51 }
52
53 auto result = ReadBarcode({buffer.get(), width, height, ImageFormat::RGBX}, hints);
54 if (result.isValid()) {
55 return { ToString(result.format()), result.text(), "", result.position() };
56 }
57 }
58 catch (const std::exception& e) {
59 return { "", L"", e.what() };
60 }
61 catch (...) {
62 return { "", L"", "Unknown error" };
63 }
64 return {};
65 }
66
readBarcodeFromPixmap(int bufferPtr,int imgWidth,int imgHeight,bool tryHarder,std::string format)67 ReadResult readBarcodeFromPixmap(int bufferPtr, int imgWidth, int imgHeight, bool tryHarder, std::string format)
68 {
69 using namespace ZXing;
70 try {
71 DecodeHints hints;
72 hints.setTryHarder(tryHarder);
73 hints.setTryRotate(tryHarder);
74 hints.setFormats(BarcodeFormatsFromString(format));
75
76 auto result =
77 ReadBarcode({reinterpret_cast<uint8_t*>(bufferPtr), imgWidth, imgHeight, ImageFormat::RGBX}, hints);
78
79 if (result.isValid()) {
80 return { ToString(result.format()), result.text(), "", result.position() };
81 }
82 }
83 catch (const std::exception& e) {
84 return { "", L"", e.what() };
85 }
86 catch (...) {
87 return { "", L"", "Unknown error" };
88 }
89 return {};
90 }
91
EMSCRIPTEN_BINDINGS(BarcodeReader)92 EMSCRIPTEN_BINDINGS(BarcodeReader)
93 {
94 using namespace emscripten;
95
96 value_object<ReadResult>("ReadResult")
97 .field("format", &ReadResult::format)
98 .field("text", &ReadResult::text)
99 .field("error", &ReadResult::error)
100 .field("position", &ReadResult::position)
101 ;
102
103 value_object<ZXing::PointI>("Point")
104 .field("x", &ZXing::PointI::x)
105 .field("y", &ZXing::PointI::y)
106 ;
107
108 value_object<ZXing::Position>("Position")
109 .field("topLeft", emscripten::index<0>())
110 .field("topRight", emscripten::index<1>())
111 .field("bottomRight", emscripten::index<2>())
112 .field("bottomLeft", emscripten::index<3>())
113 ;
114
115 function("readBarcodeFromImage", &readBarcodeFromImage);
116 function("readBarcodeFromPixmap", &readBarcodeFromPixmap);
117
118 // obsoletes
119 function("readBarcode", &readBarcodeFromImage);
120 function("readBarcodeFromPng", &readBarcodeFromImage);
121 }
122