Fix bugs (introduced in PR cyberbotics#6622) when grabbing/recording …

…with devicePixelRatio != 1. (cyberbotics#6638)

* Fix bug (introduced in PR cyberbotics#6622) when grabbing with devicePixelRatio != 1.

* Fix video recording size bug introduced by PR cyberbotics#6622.

src/webots/gui/WbVideoRecorder.cpp

@@ -345,8 +345,7 @@ void WbVideoRecorder::stopRecording(bool canceled) {
 
 void WbVideoRecorder::writeSnapshot(unsigned char *frame) {
   QString fileName = nextFileName();
-  FrameWriterThread *thread =
-    new FrameWriterThread(frame, fileName, mVideoResolution * mScreenPixelRatio, mScreenPixelRatio, mVideoQuality);
+  FrameWriterThread *thread = new FrameWriterThread(frame, fileName, mVideoResolution, 1, mVideoQuality);
   connect(thread, &QThread::finished, this, &WbVideoRecorder::terminateSnapshotWrite);
   thread->start();
 }
@@ -480,8 +479,8 @@ void WbVideoRecorder::createMpeg() {
   if (ffmpegScript.open(QIODevice::WriteOnly)) {
     // bitrate range between 4 and 24000000
     // cast into 'long long int' is mandatory on 32-bit machine
-    long long int bitrate = (long long int)mVideoQuality * mMovieFPS * mVideoResolution.width() * mVideoResolution.height() /
-                            256 / (mScreenPixelRatio * mScreenPixelRatio);
+    long long int bitrate =
+      (long long int)mVideoQuality * mMovieFPS * mVideoResolution.width() * mVideoResolution.height() / 256;
 
     QTextStream stream(&ffmpegScript);
 #ifndef _WIN32

src/webots/gui/WbWrenWindow.cpp

@@ -313,12 +313,11 @@ QImage WbWrenWindow::grabWindowBufferNow() {
     mSnapshotBufferHeight = destinationHeight;
     mSnapshotBuffer = new unsigned char[4 * destinationWidth * destinationHeight];
   }
-  const qreal ratio = devicePixelRatio();
-  const int sourceWidth = destinationWidth * ratio;
-  const int sourceHeight = destinationHeight * ratio;
+  const int sourceWidth = destinationWidth;
+  const int sourceHeight = destinationHeight;
   unsigned char *temp = new unsigned char[4 * sourceWidth * sourceHeight];
   readPixels(sourceWidth, sourceHeight, GL_BGRA, temp);
-  flipAndScaleDownImageBuffer(temp, mSnapshotBuffer, sourceWidth, sourceHeight, ratio);
+  flipAndScaleDownImageBuffer(temp, mSnapshotBuffer, sourceWidth, sourceHeight, 1.0);
   delete[] temp;
   WbWrenOpenGlContext::doneWren();
 
@@ -328,9 +327,8 @@ QImage WbWrenWindow::grabWindowBufferNow() {
 void WbWrenWindow::initVideoPBO() {
   WbWrenOpenGlContext::makeWrenCurrent();
 
-  const int ratio = (int)devicePixelRatio();
-  mVideoWidth = width() * ratio;
-  mVideoHeight = height() * ratio;
+  mVideoWidth = width();
+  mVideoHeight = height();
   const int size = 4 * mVideoWidth * mVideoHeight;
   wr_scene_init_frame_capture(wr_scene_get_instance(), PBO_COUNT, mVideoPBOIds, size);
   mVideoPBOIndex = -1;