get_interval_frames()

void fl::video::FrameTracker::get_interval_frames	(	fl::u32	now,
		fl::u32 *	frameNumber,
		fl::u32 *	nextFrameNumber,
		u8 *	amountOfNextFrame = nullptr ) const

Definition at line 14 of file frame_tracker.cpp.hpp.

                                                                                 {
    // Account for any pause time
    fl::u32 effectiveTime = now;
 
    // Convert milliseconds to microseconds for precise calculation
    fl::u64 microseconds = static_cast<fl::u64>(effectiveTime) * 1000ULL;
 
    // Calculate frame number with proper rounding
    *frameNumber = microseconds / mMicrosSecondsPerInterval;
    *nextFrameNumber = *frameNumber + 1;
 
    // Calculate interpolation amount if requested
    if (amountOfNextFrame != nullptr) {
        fl::u64 frame1_start =
            static_cast<fl::u64>(*frameNumber) * mMicrosSecondsPerInterval;
        fl::u64 frame2_start =
            static_cast<fl::u64>(*nextFrameNumber) * mMicrosSecondsPerInterval;
        fl::u32 rel_time = microseconds - frame1_start;
        fl::u32 frame_duration = frame2_start - frame1_start;
        u8 progress = map_range<fl::u32, u8>(rel_time, 0, frame_duration, 0, 255);
        *amountOfNextFrame = progress;
    }
}

References fl::FL_NO_EXCEPT, fl::map_range(), and mMicrosSecondsPerInterval.

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