Method apply_effects

src/Timeline.cpp:554–600

Apply effects to the source frame (if any)

// Apply effects to the source frame (if any)
std::shared_ptr<Frame> Timeline::apply_effects(std::shared_ptr<Frame> frame, int64_t timeline_frame_number, int layer, TimelineInfoStruct* options)
{
	// Debug output
	ZmqLogger::Instance()->AppendDebugMethod(
		"Timeline::apply_effects",
		"frame->number", frame->number,
		"timeline_frame_number", timeline_frame_number,
		"layer", layer);

	// Find Effects at this position and layer
	for (auto effect : effects)
	{
		// Does clip intersect the current requested time
		const double fpsD = info.fps.ToDouble();
		int64_t effect_start_position = static_cast<int64_t>(std::llround(effect->Position() * fpsD)) + 1;
		int64_t effect_end_position   = static_cast<int64_t>(std::llround((effect->Position() + effect->Duration()) * fpsD));

		bool does_effect_intersect = (effect_start_position <= timeline_frame_number && effect_end_position >= timeline_frame_number && effect->Layer() == layer);

		// Clip is visible
		if (does_effect_intersect)
		{
			// Determine the frame needed for this clip (based on the position on the timeline)
			int64_t effect_start_frame  = static_cast<int64_t>(std::llround(effect->Start() * fpsD)) + 1;
			int64_t effect_frame_number = timeline_frame_number - effect_start_position + effect_start_frame;

			if (!options->is_top_clip)
				continue; // skip effect, if overlapped/covered by another clip on same layer

			if (options->is_before_clip_keyframes != effect->info.apply_before_clip)
				continue; // skip effect, if this filter does not match

			// Debug output
			ZmqLogger::Instance()->AppendDebugMethod(
				"Timeline::apply_effects (Process Effect)",
				"effect_frame_number", effect_frame_number,
				"does_effect_intersect", does_effect_intersect);

			// Apply the effect to this frame
			frame = effect->ProcessFrame(frame, effect_frame_number);
		}

	} // end effect loop

	// Return modified frame
	return frame;
}

// Get or generate a blank frame
std::shared_ptr<Frame> Timeline::GetOrCreateFrame(std::shared_ptr<Frame> background_frame, Clip* clip, int64_t number, openshot::TimelineInfoStruct* options)