winrt: Implement QImageEncoderControl for camera

Implement QImageEncoderControl for camera still image capture.
It provides the functions to set camera capture resolution and
get supported resolutions list.

Task-number: QTBUG-46456
Change-Id: Ideb1aa02d420be3a30d588bebf31714fa4fa6415
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>

7 files changed, 260 insertions, 15 deletions

diff --git a/src/plugins/winrt/qwinrtcameracontrol.cpp b/src/plugins/winrt/qwinrtcameracontrol.cpp
index e4a577642..f5b75d9ab 100644
--- a/src/plugins/winrt/qwinrtcameracontrol.cpp
+++ b/src/plugins/winrt/qwinrtcameracontrol.cpp
@@ -38,6 +38,7 @@
 #include "qwinrtcameravideorenderercontrol.h"
 #include "qwinrtvideodeviceselectorcontrol.h"
 #include "qwinrtcameraimagecapturecontrol.h"
+#include "qwinrtimageencodercontrol.h"
 
 #include <QtCore/qfunctions_winrt.h>
 #include <QtCore/QCoreApplication>
@@ -75,6 +76,10 @@ QT_USE_NAMESPACE
         RETURN_VOID_IF_FAILED(msg); \
     }
 
+inline uint qHash (const QSize &key) {
+    return key.width() * key.height();
+}
+
 class CriticalSectionLocker
 {
 public:
@@ -453,6 +458,7 @@ public:
     QPointer<QWinRTCameraVideoRendererControl> videoRenderer;
     QPointer<QWinRTVideoDeviceSelectorControl> videoDeviceSelector;
     QPointer<QWinRTCameraImageCaptureControl> imageCaptureControl;
+    QPointer<QWinRTImageEncoderControl> imageEncoderControl;
 };
 
 QWinRTCameraControl::QWinRTCameraControl(QObject *parent)
@@ -470,6 +476,7 @@ QWinRTCameraControl::QWinRTCameraControl(QObject *parent)
             this, &QWinRTCameraControl::onBufferRequested);
     d->videoDeviceSelector = new QWinRTVideoDeviceSelectorControl(this);
     d->imageCaptureControl = new QWinRTCameraImageCaptureControl(this);
+    d->imageEncoderControl = new QWinRTImageEncoderControl(this);
 }
 
 QWinRTCameraControl::~QWinRTCameraControl()
@@ -654,16 +661,16 @@ QCameraImageCaptureControl *QWinRTCameraControl::imageCaptureControl() const
     return d->imageCaptureControl;
 }
 
-IMediaCapture *QWinRTCameraControl::handle() const
+QImageEncoderControl *QWinRTCameraControl::imageEncoderControl() const
 {
     Q_D(const QWinRTCameraControl);
-    return d->capture.Get();
+    return d->imageEncoderControl;
 }
 
-QSize QWinRTCameraControl::imageSize() const
+IMediaCapture *QWinRTCameraControl::handle() const
 {
     Q_D(const QWinRTCameraControl);
-    return d->size;
+    return d->capture.Get();
 }
 
 void QWinRTCameraControl::onBufferRequested()
@@ -763,10 +770,11 @@ HRESULT QWinRTCameraControl::initialize()
     Q_ASSERT_SUCCEEDED(hr);
 
     d->size = QSize();
-    ComPtr<IVideoEncodingProperties> videoEncodingProperties;
     quint32 encodingPropertiesListSize;
     hr = encodingPropertiesList->get_Size(&encodingPropertiesListSize);
     Q_ASSERT_SUCCEEDED(hr);
+    QHash<QSize, ComPtr<IVideoEncodingProperties>> videoEncodingPropertiesList;
+    int pixelCount = 0;
     for (quint32 i = 0; i < encodingPropertiesListSize; ++i) {
         ComPtr<IMediaEncodingProperties> properties;
         hr = encodingPropertiesList->GetAt(i, &properties);
@@ -779,21 +787,33 @@ HRESULT QWinRTCameraControl::initialize()
         Q_ASSERT_SUCCEEDED(hr);
         hr = videoProperties->get_Height(&height);
         Q_ASSERT_SUCCEEDED(hr);
-        // Choose the highest-quality format
-        if (int(width * height) > d->size.width() * d->size.height()) {
-            d->size = QSize(width, height);
-            videoEncodingProperties = videoProperties;
+        if (d->captureMode != QCamera::CaptureStillImage && int(width * height) > pixelCount) {
+            d->size = QSize(width, height);// Choose the Highest-quality format
+            pixelCount = d->size.width() * d->size.height();
         }
+        videoEncodingPropertiesList.insert(QSize(width, height), videoProperties);
     }
 
-    if (!videoEncodingProperties || d->size.isEmpty()) {
+    if (videoEncodingPropertiesList.isEmpty()) {
         hr = MF_E_INVALID_FORMAT;
         RETURN_HR_IF_FAILED("Failed to find a suitable video format");
     }
 
+    if (d->captureMode == QCamera::CaptureStillImage) {
+        d->imageEncoderControl->setSupportedResolutionsList(videoEncodingPropertiesList.keys());
+        d->size = d->imageEncoderControl->imageSettings().resolution();
+    }
+
     hr = RoActivateInstance(HString::MakeReference(RuntimeClass_Windows_Media_MediaProperties_MediaEncodingProfile).Get(),
                             &d->encodingProfile);
     Q_ASSERT_SUCCEEDED(hr);
+
+    const ComPtr<IVideoEncodingProperties> videoEncodingProperties = videoEncodingPropertiesList[d->size];
+    if (!videoEncodingProperties) {
+        hr = MF_E_INVALID_FORMAT;
+        RETURN_HR_IF_FAILED("Failed to find a suitable video format properties");
+    }
+
     hr = d->encodingProfile->put_Video(videoEncodingProperties.Get());
     Q_ASSERT_SUCCEEDED(hr);
     if (d->videoRenderer)
diff --git a/src/plugins/winrt/qwinrtcameracontrol.h b/src/plugins/winrt/qwinrtcameracontrol.h
index 95692cbc7..307667eb1 100644
--- a/src/plugins/winrt/qwinrtcameracontrol.h
+++ b/src/plugins/winrt/qwinrtcameracontrol.h
@@ -60,6 +60,7 @@ QT_BEGIN_NAMESPACE
 class QVideoRendererControl;
 class QVideoDeviceSelectorControl;
 class QCameraImageCaptureControl;
+class QImageEncoderControl;
 
 class QWinRTCameraControlPrivate;
 class QWinRTCameraControl : public QCameraControl
@@ -83,9 +84,9 @@ public:
     QVideoRendererControl *videoRenderer() const;
     QVideoDeviceSelectorControl *videoDeviceSelector() const;
     QCameraImageCaptureControl *imageCaptureControl() const;
+    QImageEncoderControl *imageEncoderControl() const;
 
     ABI::Windows::Media::Capture::IMediaCapture *handle() const;
-    QSize imageSize() const;
 
 private slots:
     void onBufferRequested();
diff --git a/src/plugins/winrt/qwinrtcameraimagecapturecontrol.cpp b/src/plugins/winrt/qwinrtcameraimagecapturecontrol.cpp
index 104484a6e..5a1c27b5e 100644
--- a/src/plugins/winrt/qwinrtcameraimagecapturecontrol.cpp
+++ b/src/plugins/winrt/qwinrtcameraimagecapturecontrol.cpp
@@ -36,6 +36,7 @@
 
 #include "qwinrtcameraimagecapturecontrol.h"
 #include "qwinrtcameracontrol.h"
+#include "qwinrtimageencodercontrol.h"
 
 #include <QtCore/QCoreApplication>
 #include <QtCore/QDir>
@@ -166,7 +167,7 @@ int QWinRTCameraImageCaptureControl::capture(const QString &fileName)
     hr = g->encodingPropertiesFactory->CreateBmp(&request.imageFormat);
     Q_ASSERT_SUCCEEDED(hr);
 
-    const QSize imageSize = d->cameraControl->imageSize();
+    const QSize imageSize = static_cast<QWinRTImageEncoderControl*>(d->cameraControl->imageEncoderControl())->imageSettings().resolution();
     hr = request.imageFormat->put_Width(imageSize.width());
     Q_ASSERT_SUCCEEDED(hr);
     hr = request.imageFormat->put_Height(imageSize.height());
@@ -174,6 +175,10 @@ int QWinRTCameraImageCaptureControl::capture(const QString &fileName)
 
     hr = capture->CapturePhotoToStreamAsync(request.imageFormat.Get(), request.stream.Get(), &request.op);
     Q_ASSERT_SUCCEEDED(hr);
+    if (!request.op) {
+        qErrnoWarning("Camera photo capture failed.");
+        return -1;
+    }
     d->requests.insert(request.op.Get(), request);
 
     hr = request.op->put_Completed(Callback<IAsyncActionCompletedHandler>(
@@ -266,7 +271,28 @@ HRESULT QWinRTCameraImageCaptureControl::onCaptureCompleted(IAsyncAction *asyncI
     const QImage image(pixelData, pixelWidth, pixelHeight, QImage::Format_RGBA8888,
                        reinterpret_cast<QImageCleanupFunction>(&CoTaskMemFree), pixelData);
     emit imageCaptured(request.id, image);
-    if (image.save(request.fileName))
+
+    QWinRTImageEncoderControl *imageEncoderControl = static_cast<QWinRTImageEncoderControl*>(d->cameraControl->imageEncoderControl());
+    int imageQuality = 100;
+    switch (imageEncoderControl->imageSettings().quality()) {
+    case QMultimedia::VeryLowQuality:
+        imageQuality = 20;
+        break;
+    case QMultimedia::LowQuality:
+        imageQuality = 40;
+        break;
+    case QMultimedia::NormalQuality:
+        imageQuality = 60;
+        break;
+    case QMultimedia::HighQuality:
+        imageQuality = 80;
+        break;
+    case QMultimedia::VeryHighQuality:
+        imageQuality = 100;
+        break;
+    }
+
+    if (image.save(request.fileName, imageEncoderControl->imageSettings().codec().toLatin1().data(), imageQuality))
         emit imageSaved(request.id, request.fileName);
     else
         emit error(request.id, QCameraImageCapture::ResourceError, tr("Image saving failed"));
diff --git a/src/plugins/winrt/qwinrtcameraservice.cpp b/src/plugins/winrt/qwinrtcameraservice.cpp
index 09b565753..dc9d6ee67 100644
--- a/src/plugins/winrt/qwinrtcameraservice.cpp
+++ b/src/plugins/winrt/qwinrtcameraservice.cpp
@@ -44,6 +44,7 @@
 #include <QtMultimedia/QCameraImageCaptureControl>
 #include <QtMultimedia/QVideoRendererControl>
 #include <QtMultimedia/QVideoDeviceSelectorControl>
+#include <QtMultimedia/QImageEncoderControl>
 
 QT_USE_NAMESPACE
 
@@ -90,6 +91,11 @@ QMediaControl *QWinRTCameraService::requestControl(const char *name)
             return d->cameraControl->imageCaptureControl();
     }
 
+    if (qstrcmp(name, QImageEncoderControl_iid) == 0) {
+        if (d->cameraControl)
+            return d->cameraControl->imageEncoderControl();
+    }
+
     return Q_NULLPTR;
 }
 
diff --git a/src/plugins/winrt/qwinrtimageencodercontrol.cpp b/src/plugins/winrt/qwinrtimageencodercontrol.cpp
new file mode 100644
index 000000000..0ab7a7cfb
--- /dev/null
+++ b/src/plugins/winrt/qwinrtimageencodercontrol.cpp
@@ -0,0 +1,124 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwinrtimageencodercontrol.h"
+QT_BEGIN_NAMESPACE
+
+class QWinRTImageEncoderControlPrivate
+{
+public:
+    QList<QSize> supportedResolutions;
+    QImageEncoderSettings imageEncoderSetting;
+};
+
+QWinRTImageEncoderControl::QWinRTImageEncoderControl(QObject *parent)
+    : QImageEncoderControl(parent), d_ptr(new QWinRTImageEncoderControlPrivate)
+{
+}
+
+QStringList QWinRTImageEncoderControl::supportedImageCodecs() const
+{
+    return QStringList() << QStringLiteral("jpeg");
+}
+
+QString QWinRTImageEncoderControl::imageCodecDescription(const QString &codecName) const
+{
+    if (codecName == QStringLiteral("jpeg"))
+        return tr("JPEG image");
+
+    return QString();
+}
+
+QList<QSize> QWinRTImageEncoderControl::supportedResolutions(const QImageEncoderSettings &settings, bool *continuous) const
+{
+    Q_UNUSED(settings);
+    Q_D(const QWinRTImageEncoderControl);
+
+    if (continuous)
+        *continuous = false;
+
+    return d->supportedResolutions;
+}
+
+QImageEncoderSettings QWinRTImageEncoderControl::imageSettings() const
+{
+    Q_D(const QWinRTImageEncoderControl);
+    return d->imageEncoderSetting;
+}
+
+void QWinRTImageEncoderControl::setImageSettings(const QImageEncoderSettings &settings)
+{
+    Q_D(QWinRTImageEncoderControl);
+    if (d->imageEncoderSetting == settings)
+        return;
+
+    d->imageEncoderSetting = settings;
+    applySettings();
+}
+
+void QWinRTImageEncoderControl::setSupportedResolutionsList(const QList<QSize> resolution)
+{
+    Q_D(QWinRTImageEncoderControl);
+    d->supportedResolutions = resolution;
+    applySettings();
+}
+
+void QWinRTImageEncoderControl::applySettings()
+{
+    Q_D(QWinRTImageEncoderControl);
+    d->imageEncoderSetting.setCodec(QStringLiteral("jpeg"));
+
+    QSize requestResolution = d->imageEncoderSetting.resolution();
+    if (d->supportedResolutions.isEmpty() || d->supportedResolutions.contains(requestResolution))
+        return;
+
+    if (!requestResolution.isValid())
+        requestResolution = QSize(0, 0);// Find the minimal available resolution
+
+    // Find closest resolution from the list
+    const int pixelCount = requestResolution.width() * requestResolution.height();
+    int minPixelCountGap = -1;
+    for (int i = 0; i < d->supportedResolutions.size(); ++i) {
+        int gap = qAbs(pixelCount - d->supportedResolutions.at(i).width() * d->supportedResolutions.at(i).height());
+        if (gap < minPixelCountGap || minPixelCountGap < 0) {
+            minPixelCountGap = gap;
+            requestResolution = d->supportedResolutions.at(i);
+        }
+    }
+    d->imageEncoderSetting.setResolution(requestResolution);
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/winrt/qwinrtimageencodercontrol.h b/src/plugins/winrt/qwinrtimageencodercontrol.h
new file mode 100644
index 000000000..7682e7626
--- /dev/null
+++ b/src/plugins/winrt/qwinrtimageencodercontrol.h
@@ -0,0 +1,66 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINRTIMAGEENCODERCONTROL_H
+#define QWINRTIMAGEENCODERCONTROL_H
+
+#include <qimageencodercontrol.h>
+
+QT_BEGIN_NAMESPACE
+
+class QWinRTImageEncoderControlPrivate;
+class QWinRTImageEncoderControl : public QImageEncoderControl
+{
+public:
+    explicit QWinRTImageEncoderControl(QObject *parent = 0);
+
+    QStringList supportedImageCodecs() const Q_DECL_OVERRIDE;
+    QString imageCodecDescription(const QString &codecName) const Q_DECL_OVERRIDE;
+    QList<QSize> supportedResolutions(const QImageEncoderSettings &settings, bool *continuous = 0) const Q_DECL_OVERRIDE;
+    QImageEncoderSettings imageSettings() const Q_DECL_OVERRIDE;
+    void setImageSettings(const QImageEncoderSettings &settings) Q_DECL_OVERRIDE;
+
+    void setSupportedResolutionsList(const QList<QSize> resolution);
+    void applySettings();
+
+private:
+    QScopedPointer<QWinRTImageEncoderControlPrivate> d_ptr;
+    Q_DECLARE_PRIVATE(QWinRTImageEncoderControl)
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINRTIMAGEENCODERCONTROL_H
diff --git a/src/plugins/winrt/winrt.pro b/src/plugins/winrt/winrt.pro
index 04db71e75..58c2371f9 100644
--- a/src/plugins/winrt/winrt.pro
+++ b/src/plugins/winrt/winrt.pro
@@ -18,7 +18,8 @@ HEADERS += \
     qwinrtmediaplayerservice.h \
     qwinrtplayerrenderercontrol.h \
     qwinrtserviceplugin.h \
-    qwinrtvideodeviceselectorcontrol.h
+    qwinrtvideodeviceselectorcontrol.h \
+    qwinrtimageencodercontrol.h
 
 SOURCES += \
     qwinrtabstractvideorenderercontrol.cpp \
@@ -31,7 +32,8 @@ SOURCES += \
     qwinrtmediaplayerservice.cpp \
     qwinrtplayerrenderercontrol.cpp \
     qwinrtserviceplugin.cpp \
-    qwinrtvideodeviceselectorcontrol.cpp
+    qwinrtvideodeviceselectorcontrol.cpp \
+    qwinrtimageencodercontrol.cpp
 
 OTHER_FILES += \
     winrt.json