draw() [1/2]

bool fl::video::VideoImpl::draw	(	fl::u32	now,
		fl::span< CRGB >	leds )

Definition at line 89 of file video_impl.cpp.hpp.

                                                 {
    if (!mTime) {
        mTime = fl::make_shared<TimeWarp>(now);
        mTime->setSpeed(mTimeScale);
        mTime->reset(now);
    }
    now = mTime->update(now);
    if (!mStream) {
        FL_WARN("no stream");
        return false;
    }
    bool ok = updateBufferIfNecessary(mPrevNow, now);
    mPrevNow = now;
    if (!ok) {
        FL_WARN("updateBufferIfNecessary failed");
        return false;
    }
    mFrameInterpolator->draw(now, leds);
 
    fl::u32 time = mTime->time();
    fl::u32 brightness = 255;
    // Compute fade in/out brightness.
    if (mFadeInTime || mFadeOutTime) {
        brightness = 255;
        if (time <= mFadeInTime) {
            if (mFadeInTime == 0) {
                brightness = 255;
            } else {
                brightness = time * 255 / mFadeInTime;
            }
        } else if (mFadeOutTime) {
            i32 frames_remaining = mStream->framesRemaining();
            if (frames_remaining < 0) {
                // -1 means this is a stream.
                brightness = 255;
            } else {
                FrameTracker &frame_tracker =
                    mFrameInterpolator->getFrameTracker();
                fl::u32 micros_per_frame =
                    frame_tracker.microsecondsPerFrame();
                fl::u32 millis_left =
                    (frames_remaining * micros_per_frame) / 1000;
                if (millis_left < mFadeOutTime) {
                    brightness = millis_left * 255 / mFadeOutTime;
                }
            }
        }
    }
    if (brightness < 255) {
        if (brightness == 0) {
            for (size_t i = 0; i < mPixelsPerFrame; ++i) {
                leds[i] = CRGB::Black;
            }
        } else {
            for (size_t i = 0; i < mPixelsPerFrame; ++i) {
                leds[i].nscale8(brightness);
            }
        }
    }
    return true;
}

References fl::CRGB::Black, brightness, FL_WARN, leds, fl::make_shared(), mFadeInTime, mFadeOutTime, mFrameInterpolator, fl::video::FrameTracker::microsecondsPerFrame(), mPixelsPerFrame, mPrevNow, mStream, mTime, mTimeScale, fl::time(), and updateBufferIfNecessary().

Referenced by draw().

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