Remove unnecessary QImage allocations

Author: ddennedy

src/modules/qt/filter_audiolevelgraph.cpp

@@ -200,7 +200,7 @@ static int filter_get_image(mlt_frame frame,
 
         // Draw the audio levels
         if (!error) {
-            QImage qimg(*width, *height, QImage::Format_ARGB32);
+            QImage qimg;
             convert_mlt_to_qimage(*image, &qimg, *width, *height, *format);
             draw_levels(filter, frame, &qimg, *width, *height);
             convert_qimage_to_mlt(&qimg, *image, *width, *height);

src/modules/qt/filter_audiospectrum.cpp

@@ -276,7 +276,7 @@ static int filter_get_image(mlt_frame frame,
 
         // Draw the spectrum
         if (!error) {
-            QImage qimg(*width, *height, QImage::Format_ARGB32);
+            QImage qimg;
             convert_mlt_to_qimage(*image, &qimg, *width, *height, *format);
             draw_spectrum(filter, frame, &qimg, *width, *height);
             convert_qimage_to_mlt(&qimg, *image, *width, *height);

src/modules/qt/filter_audiowaveform.cpp

@@ -364,7 +364,7 @@ static int filter_get_image(mlt_frame frame,
 
         // Draw the waveforms
         if (!error) {
-            QImage qimg(*width, *height, QImage::Format_ARGB32);
+            QImage qimg;
             convert_mlt_to_qimage(*image, &qimg, *width, *height, *image_format);
             draw_waveforms(filter,
                            frame,

src/modules/qt/filter_gpsgraphic.cpp

@@ -407,7 +407,7 @@ static int filter_get_image(mlt_frame frame,
     // Draw the graph
     if (!error) {
         process_frame_properties(filter, frame, used_crops);
-        QImage qimg(*width, *height, QImage::Format_ARGB32);
+        QImage qimg;
         convert_mlt_to_qimage(*image, &qimg, *width, *height, *format);
         draw_graphics(filter, frame, &qimg, *width, *height, used_crops);
         convert_qimage_to_mlt(&qimg, *image, *width, *height);

src/modules/qt/filter_lightshow.cpp

@@ -242,7 +242,7 @@ static int filter_get_image(mlt_frame frame,
 
         // Draw the light
         if (!error) {
-            QImage qimg(*width, *height, QImage::Format_ARGB32);
+            QImage qimg;
             convert_mlt_to_qimage(*image, &qimg, *width, *height, *format);
             draw_light(filter_properties, frame_properties, &qimg, &rect, mag);
             convert_qimage_to_mlt(&qimg, *image, *width, *height);