Skip scaling of QtImageReader and FFmpegReader only

src/Clip.cpp

@@ -149,6 +149,7 @@ Clip::Clip(ReaderBase* new_reader) : resampler(NULL), reader(new_reader), alloca
 	if (reader) {
 		End(reader->info.duration);
 		reader->ParentClip(this);
+		reader_type = reader->Name();
 		// Init reader info struct
 		init_reader_settings();
 	}
@@ -208,6 +209,7 @@ Clip::Clip(std::string path) : resampler(NULL), reader(NULL), allocated_reader(N
 	if (reader) {
 		End(reader->info.duration);
 		reader->ParentClip(this);
+		reader_type = reader->Name();
 		allocated_reader = reader;
 		// Init reader info struct
 		init_reader_settings();
@@ -482,6 +484,15 @@ void Clip::reverse_buffer(juce::AudioBuffer<float>* buffer)
 	reversed = nullptr;
 }
 
+bool Clip::shouldScale() const
+{
+	if (scale == SCALE_NONE && (reader_type == "QtImageReader" || reader_type == "FFmpegReader")) {
+		return false;
+	}
+
+	return true;
+}
+
 // Adjust the audio and image of a time mapped frame
 void Clip::get_time_mapped_frame(std::shared_ptr<Frame> frame, int64_t frame_number)
 {
@@ -1461,7 +1472,7 @@ QTransform Clip::get_transform(std::shared_ptr<Frame> frame, int width, int heig
 
 	float scaled_source_width = source_size.width();
 	float scaled_source_height = source_size.height();
-	if (scale != SCALE_NONE) {
+	if (shouldScale()) {
 		scaled_source_width *= sx;
 		scaled_source_height *= sy;
 	}
@@ -1532,7 +1543,7 @@ QTransform Clip::get_transform(std::shared_ptr<Frame> frame, int width, int heig
 		transform.translate(-origin_x_offset,-origin_y_offset);
 	}
 	// SCALE CLIP (if needed)
-	if (scale != SCALE_NONE) {
+	if (shouldScale()) {
 		float source_width_scale = (float(source_size.width()) / float(source_image->width())) * sx;
 		float source_height_scale = (float(source_size.height()) / float(source_image->height())) * sy;
 		if (!isEqual(source_width_scale, 1.0) || !isEqual(source_height_scale, 1.0)) {

src/Clip.h

@@ -120,6 +120,9 @@ namespace openshot {
 		/// (reader member variable itself may have been replaced)
 		openshot::ReaderBase* allocated_reader;
 
+		/// The type of reader passed to the clip
+		std::string reader_type;
+
 		/// Adjust frame number minimum value
 		int64_t adjust_frame_number_minimum(int64_t frame_number);
 
@@ -150,6 +153,10 @@ namespace openshot {
 		/// Reverse an audio buffer
 		void reverse_buffer(juce::AudioBuffer<float>* buffer);
 
+		/// When scale mode is SCALE_NONE, we don't need to scale QtImageReader/FFmpegReader again
+		/// because those readers already scaled before.
+		bool shouldScale() const;
+
 
 	public:
 		openshot::GravityType gravity;   ///< The gravity of a clip determines where it snaps to its parent