Add basic text stamping functionality on photos taken by QField camera

images/images.qrc

@@ -11,6 +11,7 @@
  <file alias="qfield-love.png">pictures/qfield-love.png</file>
  </qresource>
  <qresource prefix="/">
+ <file>themes/qfield/nodpi/ic_text_black_24dp.svg</file>
  <file>themes/qfield/nodpi/ic_3x3_grid_white_24dp.svg</file>
  <file>themes/qfield/nodpi/ic_digitizing_settings_black_24dp.svg</file>
  <file>themes/qfield/nodpi/ic_undo_black_24dp.svg</file>

src/core/utils/fileutils.cpp

@@ -24,6 +24,8 @@
 #include <QImage>
 #include <QImageReader>
 #include <QMimeDatabase>
+#include <QPainter>
+#include <QPainterPath>
 #include <qgis.h>
 #include <qgsexiftools.h>
 #include <qgsfileutils.h>
@@ -183,7 +185,7 @@ void FileUtils::restrictImageSize( const QString &imagePath, int maximumWidthHei
  QImage scaledImage = img.width() > img.height()
  ? img.scaledToWidth( maximumWidthHeight, Qt::SmoothTransformation )
  : img.scaledToHeight( maximumWidthHeight, Qt::SmoothTransformation );
- scaledImage.save( imagePath );
+ scaledImage.save( imagePath, nullptr, 90 );
 
  for ( const QString &key : metadata.keys() )
  {
@@ -236,3 +238,42 @@ void FileUtils::addImageMetadata( const QString &imagePath, const GnssPositionIn
  QgsExifTools::tagImage( imagePath, key, metadata[key] );
  }
 }
+
+void FileUtils::addImageStamp( const QString &imagePath, const QString &text )
+{
+ if ( !QFileInfo::exists( imagePath ) || text.isEmpty() )
+ {
+ return;
+ }
+
+ QVariantMap metadata = QgsExifTools::readTags( imagePath );
+ QImage img( imagePath );
+ if ( !img.isNull() )
+ {
+ QPainter painter( &img );
+ painter.setRenderHint( QPainter::Antialiasing );
+
+ QFont font = painter.font();
+ const int pixelSize = std::min( img.width(), img.height() ) / 45;
+ font.setPixelSize( pixelSize );
+ font.setBold( true );
+
+ QPainterPath path;
+ QStringList lines = text.split( QStringLiteral( "\n" ) );
+ for ( int i = 0; i < lines.size(); i++ )
+ {
+ path.addText( QPointF( 10, img.height() - ( ( pixelSize + pixelSize / 4 ) * ( lines.size() - i - 1 ) ) - 10 ), font, lines.at( i ) );
+ }
+
+ painter.setPen( Qt::black );
+ painter.setBrush( Qt::white );
+ painter.drawPath( path );
+
+ img.save( imagePath, nullptr, 90 );
+
+ for ( const QString &key : metadata.keys() )
+ {
+ QgsExifTools::tagImage( imagePath, key, metadata[key] );
+ }
+ }
+}

src/core/utils/fileutils.h

@@ -55,6 +55,8 @@ class QFIELD_CORE_EXPORT FileUtils : public QObject
 
  Q_INVOKABLE void addImageMetadata( const QString &imagePath, const GnssPositionInformation &positionInformation );
 
+ Q_INVOKABLE void addImageStamp( const QString &imagePath, const QString &text );
+
  static bool copyRecursively( const QString &sourceFolder, const QString &destFolder, QgsFeedback *feedback = nullptr, bool wipeDestFolder = true );
  /**
  * Creates checksum of a file. Returns null QByteArray if cannot be calculated.

src/core/utils/positioningutils.cpp

@@ -35,6 +35,11 @@ GnssPositionInformation PositioningUtils::createGnssPositionInformation( double
  verticalSpeed, magneticVariation, 0, sourceName );
 }
 
+GnssPositionInformation PositioningUtils::createEmptyGnssPositionInformation()
+{
+ return GnssPositionInformation();
+}
+
 GnssPositionInformation PositioningUtils::averagedPositionInformation( const QList<QVariant> &positionsInformation )
 {
  QList<GnssPositionInformation> convertedList;

src/core/utils/positioningutils.h

@@ -37,6 +37,11 @@ class QFIELD_CORE_EXPORT PositioningUtils : public QObject
  */
  static Q_INVOKABLE GnssPositionInformation createGnssPositionInformation( double latitude, double longitude, double altitude, double speed, double direction, double horizontalAccuracy, double verticalAcurracy, double verticalSpeed, double magneticVariation, const QDateTime &timestamp, const QString &sourceName );
 
+ /**
+ * Creates an empty GnssPositionInformation.
+ */
+ static Q_INVOKABLE GnssPositionInformation createEmptyGnssPositionInformation();
+
  /**
  * Returns an average GnssPositionInformation from a list of position information
  */

src/qml/QFieldCamera.qml

@@ -14,8 +14,8 @@ Popup {
  property bool isCapturing: state == "PhotoCapture" || state == "VideoCapture"
  property bool isPortraitMode: mainWindow.height > mainWindow.width
 
- property string currentPath
- property var currentPosition
+ property string currentPath: ''
+ property var currentPosition: PositioningUtils.createEmptyGnssPositionInformation()
 
  signal finished(string path)
  signal canceled
@@ -75,13 +75,24 @@ Popup {
 
  Settings {
  id: cameraSettings
+ property bool stamping: false
  property bool geoTagging: true
  property bool showGrid: false
  property string deviceId: ''
  property size resolution: Qt.size(0, 0)
  property int pixelFormat: 0
  }
 
+ ExpressionEvaluator {
+ id: stampExpressionEvaluator
+
+ mode: ExpressionEvaluator.ExpressionMode
+ expressionText: "format_date(now(), 'yyyy-MM-dd @ HH:mm') || if(@gnss_coordinate is not null, format('\nLatitude %1 | Longitude %2 | Altitude %3 | Speed %4', coalesce(y(@gnss_coordinate), 'N/A'), coalesce(x(@gnss_coordinate), 'N/A'), coalesce(z(@gnss_coordinate), 'N/A'), if(@gnss_ground_speed != 'nan', @gnss_ground_speed || ' m/s', 'N/A')), '')"
+
+ project: qgisProject
+ positionInformation: currentPosition
+ }
+
  Page {
  width: parent.width
  height: parent.height
@@ -354,12 +365,13 @@ Popup {
  onClicked: {
  if (cameraItem.state == "PhotoCapture") {
  captureSession.imageCapture.captureToFile(qgisProject.homePath + '/DCIM/');
- if (cameraSettings.geoTagging) {
- if (positionSource.active) {
- currentPosition = positionSource.positionInformation;
- } else {
- displayToast(qsTr("Image geotagging requires positioning to be turned on"), "warning");
- }
+ if (positionSource.active) {
+ currentPosition = positionSource.positionInformation;
+ } else {
+ currentPosition = PositioningUtils.createEmptyGnssPositionInformation();
+ }
+ if (cameraSettings.geoTagging && !positionSource.active) {
+ displayToast(qsTr("Image geotagging requires positioning to be turned on"), "warning");
  }
  } else if (cameraItem.state == "VideoCapture") {
  if (captureSession.recorder.recorderState === MediaRecorder.StoppedState) {
@@ -376,6 +388,9 @@ Popup {
  if (cameraSettings.geoTagging && positionSource.active) {
  FileUtils.addImageMetadata(currentPath, currentPosition);
  }
+ if (cameraSettings.stamping) {
+ FileUtils.addImageStamp(currentPath, stampExpressionEvaluator.evaluate());
+ }
  }
  cameraItem.finished(currentPath);
  }
@@ -552,6 +567,24 @@ Popup {
  }
  }
 
+ QfToolButton {
+ id: stampingButton
+
+ width: 40
+ height: 40
+ padding: 2
+
+ iconSource: Theme.getThemeVectorIcon("ic_text_black_24dp")
+ iconColor: cameraSettings.stamping ? Theme.mainColor : "white"
+ bgcolor: Theme.darkGraySemiOpaque
+ round: true
+
+ onClicked: {
+ cameraSettings.stamping = !cameraSettings.stamping;
+ displayToast(cameraSettings.stamping ? qsTr("Details stamping enabled") : qsTr("Details tamping disabled"));
+ }
+ }
+
  QfToolButton {
  id: geotagButton
 

src/qml/QFieldSettings.qml

@@ -15,7 +15,7 @@ Page {
  property alias locatorKeepScale: registry.locatorKeepScale
  property alias numericalDigitizingInformation: registry.numericalDigitizingInformation
  property alias showBookmarks: registry.showBookmarks
- property alias nativeCamera: registry.nativeCamera
+ property alias nativeCamera2: registry.nativeCamera2
  property alias digitizingVolumeKeys: registry.digitizingVolumeKeys
  property alias autoSave: registry.autoSave
  property alias fingerTapDigitizing: registry.fingerTapDigitizing
@@ -27,7 +27,7 @@ Page {
  Component.onCompleted: {
  if (settings.valueBool('nativeCameraLaunched', false)) {
  // a crash occured while the native camera was launched, disable it
- nativeCamera = false;
+ nativeCamera2 = false;
  }
  }
 
@@ -42,7 +42,7 @@ Page {
  property bool locatorKeepScale: false
  property bool numericalDigitizingInformation: false
  property bool showBookmarks: true
- property bool nativeCamera: platformUtilities.capabilities & PlatformUtilities.NativeCamera
+ property bool nativeCamera2: false
  property bool digitizingVolumeKeys: platformUtilities.capabilities & PlatformUtilities.VolumeKeys
  property bool autoSave: false
  property bool fingerTapDigitizing: false
@@ -154,7 +154,7 @@ Page {
  ListElement {
  title: qsTr("Use native camera")
  description: qsTr("If disabled, QField will use a minimalist internal camera instead of the camera app on the device.<br>Tip: Enable this option and install the open camera app to create geo tagged photos.")
- settingAlias: "nativeCamera"
+ settingAlias: "nativeCamera2"
  isVisible: true
  }
  ListElement {
@@ -165,7 +165,7 @@ Page {
  }
  Component.onCompleted: {
  for (var i = 0; i < count; i++) {
- if (get(i).settingAlias === 'nativeCamera') {
+ if (get(i).settingAlias === 'nativeCamera2') {
  setProperty(i, 'isVisible', platformUtilities.capabilities & PlatformUtilities.NativeCamera ? true : false);
  } else if (get(i).settingAlias === 'enableInfoCollection') {
  setProperty(i, 'isVisible', platformUtilities.capabilities & PlatformUtilities.SentryFramework ? true : false);

src/qml/editorwidgets/ExternalResource.qml

@@ -647,7 +647,7 @@ EditorWidgetBase {
 
  function capturePhoto() {
  Qt.inputMethod.hide();
- if (platformUtilities.capabilities & PlatformUtilities.NativeCamera && settings.valueBool("nativeCamera", true)) {
+ if (platformUtilities.capabilities & PlatformUtilities.NativeCamera && settings.valueBool("nativeCamera2", true)) {
  var filepath = getResourceFilePath();
  // Pictures taken by cameras will always be JPG
  filepath = filepath.replace('{extension}', 'JPG');
@@ -661,7 +661,7 @@ EditorWidgetBase {
 
  function captureVideo() {
  Qt.inputMethod.hide();
- if (platformUtilities.capabilities & PlatformUtilities.NativeCamera && settings.valueBool("nativeCamera", true)) {
+ if (platformUtilities.capabilities & PlatformUtilities.NativeCamera && settings.valueBool("nativeCamera2", true)) {
  var filepath = getResourceFilePath();
  // Video taken by cameras will always be MP4
  filepath = filepath.replace('{extension}', 'MP4');