Add V4L2 handling of image processing fields

Ported over from the camerabin code base.

Change-Id: Ib1332f91cdf2ccdba0eb8779c5769444a4ea5cc5
Reviewed-by: Doris Verria <doris.verria@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

2 files changed, 95 insertions, 14 deletions

diff --git a/examples/multimediawidgets/camera/camera.cpp b/examples/multimediawidgets/camera/camera.cpp
index 4baf145b3..c77af6482 100644
--- a/examples/multimediawidgets/camera/camera.cpp
+++ b/examples/multimediawidgets/camera/camera.cpp
@@ -134,6 +134,24 @@ void Camera::setCamera(const QCameraInfo &cameraInfo)
             this, &Camera::displayCaptureError);
     readyForCapture(m_imageCapture->isReadyForCapture());
 
+    QCameraImageProcessing *imageProcessing = m_camera->imageProcessing();
+    if (!imageProcessing) {
+        ui->brightnessSlider->setEnabled(false);
+        ui->contrastSlider->setEnabled(false);
+        ui->saturationSlider->setEnabled(false);
+    } else {
+        connect(ui->brightnessSlider, &QSlider::valueChanged, [imageProcessing](int value) {
+            imageProcessing->setBrightness(value/100.);
+        });
+        connect(ui->contrastSlider, &QSlider::valueChanged, [imageProcessing](int value) {
+            imageProcessing->setContrast(value/100.);
+        });
+        connect(ui->saturationSlider, &QSlider::valueChanged, [imageProcessing](int value) {
+            imageProcessing->setSaturation(value/100.);
+        });
+    }
+
+
     updateCaptureMode();
     m_camera->start();
 }
diff --git a/examples/multimediawidgets/camera/camera.ui b/examples/multimediawidgets/camera/camera.ui
index e00e9d843..ad14096ba 100644
--- a/examples/multimediawidgets/camera/camera.ui
+++ b/examples/multimediawidgets/camera/camera.ui
@@ -25,21 +25,21 @@
         <string>Image</string>
        </attribute>
        <layout class="QGridLayout" name="gridLayout">
-        <item row="0" column="0">
-         <widget class="QPushButton" name="takeImageButton">
-          <property name="enabled">
-           <bool>false</bool>
-          </property>
+        <item row="4" column="0">
+         <widget class="QLabel" name="label_3">
           <property name="text">
-           <string>Capture Photo</string>
+           <string>Contrast</string>
           </property>
-          <property name="icon">
-           <iconset>
-            <normaloff>:/images/shutter.svg</normaloff>:/images/shutter.svg</iconset>
+         </widget>
+        </item>
+        <item row="10" column="0">
+         <widget class="QLabel" name="label">
+          <property name="text">
+           <string>Exposure Compensation:</string>
           </property>
          </widget>
         </item>
-        <item row="1" column="0">
+        <item row="9" column="0">
          <spacer name="verticalSpacer_2">
           <property name="orientation">
            <enum>Qt::Vertical</enum>
@@ -52,14 +52,41 @@
           </property>
          </spacer>
         </item>
-        <item row="2" column="0">
-         <widget class="QLabel" name="label">
+        <item row="7" column="0">
+         <widget class="QLabel" name="label_2">
           <property name="text">
-           <string>Exposure Compensation:</string>
+           <string>Saturation</string>
           </property>
          </widget>
         </item>
         <item row="3" column="0">
+         <widget class="QSlider" name="brightnessSlider">
+          <property name="minimum">
+           <number>-100</number>
+          </property>
+          <property name="maximum">
+           <number>100</number>
+          </property>
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="0">
+         <widget class="QPushButton" name="takeImageButton">
+          <property name="enabled">
+           <bool>false</bool>
+          </property>
+          <property name="text">
+           <string>Capture Photo</string>
+          </property>
+          <property name="icon">
+           <iconset>
+            <normaloff>:/images/shutter.svg</normaloff>:/images/shutter.svg</iconset>
+          </property>
+         </widget>
+        </item>
+        <item row="11" column="0">
          <widget class="QSlider" name="exposureCompensation">
           <property name="minimum">
            <number>-4</number>
@@ -78,6 +105,42 @@
           </property>
          </widget>
         </item>
+        <item row="8" column="0">
+         <widget class="QSlider" name="saturationSlider">
+          <property name="minimum">
+           <number>-100</number>
+          </property>
+          <property name="maximum">
+           <number>100</number>
+          </property>
+          <property name="value">
+           <number>0</number>
+          </property>
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+         </widget>
+        </item>
+        <item row="2" column="0">
+         <widget class="QLabel" name="label_4">
+          <property name="text">
+           <string>Brightness</string>
+          </property>
+         </widget>
+        </item>
+        <item row="6" column="0">
+         <widget class="QSlider" name="contrastSlider">
+          <property name="minimum">
+           <number>-100</number>
+          </property>
+          <property name="maximum">
+           <number>100</number>
+          </property>
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+         </widget>
+        </item>
        </layout>
       </widget>
       <widget class="QWidget" name="tab">
@@ -130,7 +193,7 @@
          </widget>
         </item>
         <item row="5" column="0">
-          <widget class="QPushButton" name="metaDataButton">
+         <widget class="QPushButton" name="metaDataButton">
           <property name="text">
            <string>Set metadata</string>
           </property>