From bef8c129bf20dea2432d92c277c8d985cc1a3257 Mon Sep 17 00:00:00 2001
From: Nikolaos Ftylitakis <ftylitak@gmail.com>
Date: Wed, 11 Aug 2021 12:23:06 +0300
Subject: [PATCH 1/3] Support QZXingFilter orientation respect proposed in
 #120. Could be usefull for #204

---
 src/QZXingFilter.cpp | 31 ++++++++++++++++++++++++++++++-
 src/QZXingFilter.h   |  5 +++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/QZXingFilter.cpp b/src/QZXingFilter.cpp
index 19bb8b6..2bb3c95 100644
--- a/src/QZXingFilter.cpp
+++ b/src/QZXingFilter.cpp
@@ -43,6 +43,7 @@ QZXingFilter::QZXingFilter(QObject *parent)
     : QAbstractVideoFilter(parent)
     , decoder(QZXing::DecoderFormat_QR_CODE)
     , decoding(false)
+    , orientation_(0)
 {
     /// Connecting signals to handlers that will send signals to QML
     connect(&decoder, &QZXing::decodingStarted,
@@ -69,6 +70,21 @@ void QZXingFilter::handleDecodingFinished(bool succeeded)
     emit isDecodingChanged();
 }
 
+void QZXingFilter::setOrientation(int orientation)
+{
+    if (orientation_ == orientation) {
+            return;
+        }
+
+        orientation_ = orientation;
+        emit orientationChanged(orientation_);
+}
+
+int QZXingFilter::orientation() const
+{
+    return orientation_;
+}
+
 QVideoFilterRunnable * QZXingFilter::createFilterRunnable()
 {
     return new QZXingFilterRunnable(this);
@@ -372,7 +388,20 @@ void QZXingFilterRunnable::processVideoFrameProbed(SimpleVideoFrame & videoFrame
 
     //QZXingImageProvider::getInstance()->storeImage(image);
 
-    decode(*image_ptr);
+    int orientation = filter ? filter->orientation() : 0;
+
+    if (!orientation) {
+        decode(*image_ptr);
+    } else {
+        QImage translatedImage = image_ptr->transformed([](QPoint center, int orientation) {
+                QMatrix matrix;
+                matrix.translate(center.x(), center.y());
+                matrix.rotate(-orientation);
+                return matrix;
+        } (image_ptr->rect().center(), orientation));
+
+        decode(translatedImage);
+    }
 
     delete image_ptr;
 }
diff --git a/src/QZXingFilter.h b/src/QZXingFilter.h
index d963f3e..e504789 100644
--- a/src/QZXingFilter.h
+++ b/src/QZXingFilter.h
@@ -75,16 +75,20 @@ class QZXingFilter : public QAbstractVideoFilter
         Q_PROPERTY(bool decoding READ isDecoding NOTIFY isDecodingChanged)
         Q_PROPERTY(QZXing* decoder READ getDecoder)
         Q_PROPERTY(QRectF captureRect MEMBER captureRect NOTIFY captureRectChanged)
+        Q_PROPERTY(int orientation READ orientation WRITE setOrientation NOTIFY orientationChanged)
 
     signals:
         void isDecodingChanged();
         void decodingFinished(bool succeeded, int decodeTime);
         void decodingStarted();
         void captureRectChanged();
+        void orientationChanged(int orientation);
 
     private slots:
         void handleDecodingStarted();
         void handleDecodingFinished(bool succeeded);
+        void setOrientation(int orientation);
+        int orientation() const;
 
     private: /// Attributes
         QZXing decoder;
@@ -93,6 +97,7 @@ class QZXingFilter : public QAbstractVideoFilter
 
         SimpleVideoFrame frame;
         QFuture<void> processThread;
+        int orientation_;
 
     public:  /// Methods
         explicit QZXingFilter(QObject *parent = 0);

From b1659be29a6347414a4039749ee68258e4d88f5c Mon Sep 17 00:00:00 2001
From: Nikolaos Ftylitakis <ftylitak@gmail.com>
Date: Thu, 12 Aug 2021 11:05:36 +0300
Subject: [PATCH 2/3] Add orientation binding in QZXingFilter QML component

---
 examples/QZXingLive/main.qml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/examples/QZXingLive/main.qml b/examples/QZXingLive/main.qml
index 5c171e1..142fcbe 100644
--- a/examples/QZXingLive/main.qml
+++ b/examples/QZXingLive/main.qml
@@ -85,6 +85,7 @@ ApplicationWindow
     QZXingFilter
     {
         id: zxingFilter
+        orientation: videoOutput.orientation
         captureRect: {
             // setup bindings
             videoOutput.contentRect;

From 4db0aa28c80c300ee244a5e07ab7ebb33a40ac9b Mon Sep 17 00:00:00 2001
From: Nikolaos Ftylitakis <ftylitak@gmail.com>
Date: Thu, 12 Aug 2021 11:06:10 +0300
Subject: [PATCH 3/3] Change QMatrix to QTransform when applying orientation
 rotation to QImage before decode

---
 src/QZXingFilter.cpp | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/QZXingFilter.cpp b/src/QZXingFilter.cpp
index 2bb3c95..3fdeb6c 100644
--- a/src/QZXingFilter.cpp
+++ b/src/QZXingFilter.cpp
@@ -393,12 +393,11 @@ void QZXingFilterRunnable::processVideoFrameProbed(SimpleVideoFrame & videoFrame
     if (!orientation) {
         decode(*image_ptr);
     } else {
-        QImage translatedImage = image_ptr->transformed([](QPoint center, int orientation) {
-                QMatrix matrix;
-                matrix.translate(center.x(), center.y());
-                matrix.rotate(-orientation);
-                return matrix;
-        } (image_ptr->rect().center(), orientation));
+        QTransform transformation;
+        transformation.translate(image_ptr->rect().center().x(), image_ptr->rect().center().y());
+        transformation.rotate(-orientation);
+
+        QImage translatedImage = image_ptr->transformed(transformation);
 
         decode(translatedImage);
     }