fix share screen on HDPI

FFMEPG only deal with the true resolution of the screen
(not the scaled HDPI one) so we need to feed it the real size of screen
(entire screen share) or a scaled version of the selection rect (partial
screen share)

see https://github.com/FFmpeg/FFmpeg/commit/e82883aa88bfccf2669e914eab9deef6cecfd0db

Change-Id: I3f2e1ec41a75c3e4b18a84c86491f95a6f98a877
Tuleap: #716

selectareadialog.cpp

@@ -18,6 +18,16 @@
 
 #include "selectareadialog.h"
 
+#ifdef Q_OS_WIN
+#define WIN32_LEAN_AND_MEAN 1
+#include <windows.h>
+#include <winuser.h>
+
+#undef OUT
+#undef IN
+#undef ERROR
+#endif
+
 #include <QApplication>
 #include <QScreen>
 #include <QPainter>
@@ -37,11 +47,13 @@ SelectAreaDialog::SelectAreaDialog() :
     setAttribute(Qt::WA_TranslucentBackground, true);
     setAttribute(Qt::WA_PaintOnScreen);
     grabMouse();
-    rubberBand_ = new QRubberBand(QRubberBand::Rectangle,0);
+    rubberBand_ = new QRubberBand(QRubberBand::Rectangle, this);
     QApplication::setOverrideCursor(Qt::CrossCursor);
     QScreen* screen = QGuiApplication::primaryScreen();
-    if (screen)
+    if (screen) {
         originalPixmap_ = screen->grabWindow(0);
+        originalPixmap_.setDevicePixelRatio(screen->devicePixelRatio());
+    }
 }
 
 void
@@ -71,13 +83,23 @@ SelectAreaDialog::mouseReleaseEvent(QMouseEvent* event)
         releaseMouse();
         if (auto call = CallModel::instance().selectedCall()) {
             if (auto outVideo = call->firstMedia<Media::Video>(Media::Media::Direction::OUT)) {
-                int x, y, width, height;
-                QRect realRect;
-                rubberBand_->geometry().getRect(&x, &y, &width, &height);
-                realRect.setX(x);
-                realRect.setY(y);
-                realRect.setWidth(width);
-                realRect.setHeight(height);
+                QRect realRect = rubberBand_->geometry();
+#ifdef Q_OS_WIN
+                if (QGuiApplication::primaryScreen()->devicePixelRatio() > 1.0) {
+                    auto scaledSize = QGuiApplication::primaryScreen()->geometry();
+                    auto sourceHdc = GetDC(nullptr);
+                    auto vertres = GetDeviceCaps(sourceHdc, VERTRES);
+                    auto horzres = GetDeviceCaps(sourceHdc, HORZRES);
+                    auto height = realRect.height() * QGuiApplication::primaryScreen()->devicePixelRatio();
+                    auto width = realRect.width() * QGuiApplication::primaryScreen()->devicePixelRatio();
+                    float xRatio = static_cast<float>(horzres) / static_cast<float>(scaledSize.width());
+                    float yRatio = static_cast<float>(vertres) / static_cast<float>(scaledSize.height());
+                    realRect.setX(static_cast<int>(realRect.x() * xRatio));
+                    realRect.setY(static_cast<int>(realRect.y() * yRatio));
+                    realRect.setWidth(static_cast<int>(width));
+                    realRect.setHeight(static_cast<int>(height));
+                }
+#endif
                 outVideo->sourceModel()->setDisplay(0, realRect);
             }
         }
@@ -88,7 +110,8 @@ SelectAreaDialog::mouseReleaseEvent(QMouseEvent* event)
 }
 
 void
-SelectAreaDialog::paintEvent(QPaintEvent* event) {
+SelectAreaDialog::paintEvent(QPaintEvent* event)
+{
     Q_UNUSED(event)
     QPainter painter(this);
 

videoview.cpp

@@ -31,6 +31,7 @@
 #include <QFileDialog>
 #include <QMimeData>
 #include <QSplitter>
+#include <QScreen>
 
 #include <memory>
 
@@ -81,8 +82,8 @@ VideoView::resizeEvent(QResizeEvent* event)
     int deltaH = event->size().height() - event->oldSize().height();
 
     QPoint previewCenter = ui->videoWidget->getPreviewRect().center();
-    float cx = (float)(event->oldSize().width()) / 2.f;
-    float cy = (float)(event->oldSize().height()) / 2.f;
+    int cx = (event->oldSize().width()) / 2;
+    int cy = (event->oldSize().height()) / 2;
     QPoint center = QPoint(cx, cy);
 
     // first we check if we want to displace the preview
@@ -255,8 +256,12 @@ VideoView::showContextMenu(const QPoint& pos)
     }
 
     connect(shareAction, &QAction::triggered, [=]() {
-        if (outVideo)
-            outVideo->sourceModel()->setDisplay(0, QApplication::desktop()->rect());
+        if (outVideo) {
+            auto realRect = QApplication::desktop()->geometry();
+            realRect.setWidth(static_cast<int>(realRect.width() * QApplication::primaryScreen()->devicePixelRatio()));
+            realRect.setHeight(static_cast<int>(realRect.height() * QApplication::primaryScreen()->devicePixelRatio()));
+            outVideo->sourceModel()->setDisplay(0, realRect);
+        }
     });
     connect(shareFileAction, &QAction::triggered, [=]() {
         QFileDialog dialog(this);