C++ VideoBuffer类代码示例

void main()
{
    //SETUP VIDEO BUFFER
    static VideoBuffer vid; //create video buffer for each cube
    vid.initMode(BG0_SPR_BG1); //set video buffer to BG0_SPR_BG1 mode
    vid.attach(0); //attach video buffer to cube with ID 0

    //BACKGROUND LAYER
    vid.bg0.image(vec(0,0), MyBG0Image); //Set the image `Background` defined in assets.lua to the VideoBuffer's BG0 layer

    //SPRITES LAYER
    vid.sprites[0].setImage(MyRedSprite); //assign our first sprite
    vid.sprites[0].move(15,15); //move it to where we want it

    vid.sprites[1].setImage(MyBlueSprite);
    vid.sprites[1].move(93, 60); 

    //FOREGROUND LAYER
    vid.bg1.setMask(BG1Mask::filled(vec(4,4), vec(8,8))); //Mask an area in the location and size of our BG1 image
    vid.bg1.image(vec(4,4), MyBG1Image); //Place a BG1 image in the same space as the mask. 

    while (1) { //game looop
        System::paint();
    }
}

void main()
{
    CubeID cube(0);

    VideoBuffer vid;
    vid.initMode(BG0);
    vid.attach(cube);

    for (int x = -1; x < 17; x++) {
        drawColumn(vid, x);
    }

    /*
     * Scroll horizontally through our background based on the accelerometer's X axis.
     *
     * We can scroll with pixel accuracy within a column of tiles via bg0.setPanning().
     * When we get to either edge of the currently plotted tiles, draw a new column
     * of tiles from the source image.
     *
     * Because BG0 is 1 tile wider and taller than the viewport itself, we can pre-load
     * the next column of tiles into the column at the edge before it comes into view.
     */

    float x = 0;
    int prev_xt = 0;

    for (;;) {
        // Scroll based on accelerometer tilt
        Int2 accel = vid.physicalAccel().xy();

        // Floating point pixels
        x += accel.x * (40.0f / 128.0f);

        // Integer pixels
        int xi = x + 0.5f;

        // Integer tiles
        int xt = x / 8;

        while (prev_xt < xt) {
            // Fill in new tiles, just past the right edge of the screen
            drawColumn(vid, prev_xt + 17);
            prev_xt++;
        }

        while (prev_xt > xt) {
            // Fill in new tiles, just past the left edge
            drawColumn(vid, prev_xt - 2);
            prev_xt--;
        }

        // pixel-level scrolling within the current column
        vid.bg0.setPanning(vec(xi, 0));

        System::paint();
    }
}

void CaptureCallback::ContextData::readImage()
{
    int width = _graphicsContext->getTraits()->width;
    int height = _graphicsContext->getTraits()->height;

    if (width!=_width || _height!=height)
    {
        _width = width; 
        _height = height;
    }
    

    if (_delegate)
    {
 
        VideoBuffer *buffer = _delegate->getVideoBuffer();

        GLint internalFormat = GL_BGRA;     // This is fine for iOS

#ifdef ANDROID                              // Depending in the platform / android version, the pixel format will change
        glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &internalFormat);
        if (internalFormat == GL_RGB)
            internalFormat = GL_RGBA;
#endif
        
        buffer->pixelFormat = internalFormat;


        size_t bpp = buffer->bpp();
        size_t bpr = buffer->bpr();

        GLubyte *pixelBufferData = (GLubyte *)buffer->data();

        glReadPixels(0, 0, width, height, internalFormat, GL_UNSIGNED_BYTE, pixelBufferData);

        
        if (bpr != width*bpp){

            // There is some padding expected in the buffer, let's move stuff around
            for (int y = height-1; y > 0; --y){

                memmove(pixelBufferData + y * bpr, pixelBufferData + y * width * bpp, width * bpp);

            }
            
        } 
        
        _delegate->didCaptureImage();
        
    }
}

VideoBuffer * SignTool::GetIcon(int toolID, int width, int height)
{
	VideoBuffer * newTexture = new VideoBuffer(width, height);
	for (int y=0; y<height; y++)
	{
		for (int x=0; x<width; x++)
		{
			pixel pc =  x==0||x==width-1||y==0||y==height-1 ? PIXPACK(0xA0A0A0) : PIXPACK(0x000000);
			newTexture->SetPixel(x, y, PIXR(pc), PIXG(pc), PIXB(pc), 255);
		}
	}
	newTexture->AddCharacter((width/2)-5, (height/2)-5, 0xE021, 32, 64, 128, 255);
	newTexture->BlendCharacter((width/2)-5, (height/2)-5, 0xE020, 255, 255, 255, 255);
	return newTexture;
}

void VideoHeader::setup(VideoBuffer & buffer){
    //newFrameEvent.init("Playmodes.VideoHeader.newFrame");
    this->buffer= &buffer;
    fps         = buffer.getFps();
    position    = buffer.size();
    oneFrame    = (pmTimeDiff)round(1000000.0/(float)fps);
    speed       = 1;
    prevBufferPos = 0;
    pct         = 1;
    pctHasChanged = true;
    in          = 0;
    out         = 1;
    loopMode    = 0;
    delay       = 0;

}

VideoBuffer * SaveRenderer::Render(unsigned char * saveData, int dataSize, bool decorations, bool fire)
{
	GameSave * tempSave;
	try {
		tempSave = new GameSave((char*)saveData, dataSize);
	} catch (std::exception & e) {
		
		//Todo: make this look a little less shit
		VideoBuffer * buffer = new VideoBuffer(64, 64);
		buffer->BlendCharacter(32, 32, 'x', 255, 255, 255, 255);
		
		return buffer;
	}
	VideoBuffer * thumb = Render(tempSave, decorations, fire);
	delete tempSave;
	return thumb;
}

VideoBuffer *DecorationTool::GetIcon(int toolID, int width, int height)
{
	VideoBuffer * newTexture = new VideoBuffer(width, height);
	for (int y=0; y<height; y++)
	{
		for (int x=0; x<width; x++)
		{
			//if (toolID == DECO_LIGH)
			//	vid_buf[WINDOWW*(y+j)+(x+i)] = PIXRGB(PIXR(pc)-10*j, PIXG(pc)-10*j, PIXB(pc)-10*j);
			//else if (toolID == DECO_DARK)
			//	vid_buf[WINDOWW*(y+j)+(x+i)] = PIXRGB(PIXR(pc)+10*j, PIXG(pc)+10*j, PIXB(pc)+10*j);
			if (toolID == DECO_SMUDGE)
				newTexture->SetPixel(x, y, 0, 255-5*x, 5*x, 255);
			else if (toolID == DECO_DRAW || toolID == DECO_CLEAR)
				newTexture->SetPixel(x, y, Red, Green, Blue, Alpha);
			else
				newTexture->SetPixel(x, y, 50, 50, 50, 255);
		}
	}
	if (toolID == DECO_CLEAR)
	{
		int reverseRed = (Red+127)%256;
		int reverseGreen = (Green+127)%256;
		int reverseBlue = (Blue+127)%256;
		for (int y=4; y<12; y++)
		{
			newTexture->SetPixel(y+5, y-1, reverseRed, reverseGreen, reverseBlue, 255);
			newTexture->SetPixel(y+6, y-1, reverseRed, reverseGreen, reverseBlue, 255);
			newTexture->SetPixel(20-y, y-1, reverseRed, reverseGreen, reverseBlue, 255);
			newTexture->SetPixel(21-y, y-1, reverseRed, reverseGreen, reverseBlue, 255);
		}
	}
	else if (toolID == DECO_ADD)
		newTexture->AddCharacter(11, 4, '+', Red, Green, Blue, 255);
	else if (toolID == DECO_SUBTRACT)
		newTexture->AddCharacter(11, 4, '-', Red, Green, Blue, 255);
	else if (toolID == DECO_MULTIPLY)
		newTexture->AddCharacter(11, 3, 'x', Red, Green, Blue, 255);
	else if (toolID == DECO_DIVIDE)
		newTexture->AddCharacter(11, 4, '/', Red, Green, Blue, 255);
	return newTexture;
}

RequestBroker::ProcessResponse ThumbRenderRequest::Process(RequestBroker & rb)
{
	VideoBuffer * thumbnail = SaveRenderer::Ref().Render(Save, Decorations, Fire);

	delete Save;
	Save = NULL;

	if(thumbnail)
	{
		thumbnail->Resize(Width, Height, true);
		ResultObject = (void*)thumbnail;
		rb.requestComplete((Request*)this);
		return RequestBroker::Finished;
	}
	else
	{
		return RequestBroker::Failed;
	}
	return RequestBroker::Failed;
}

//.........这里部分代码省略.........
      }
    }
    else if (filename == "webcam" || startsWith(filename, WEBCAM_PREFIX))
    {
      int webcamnumber = 0;
      
      // If they supplied "/dev/video[number]" parse the "number" here
      if(startsWith(filename, WEBCAM_PREFIX) && filename.length() > WEBCAM_PREFIX.length())
      {
        webcamnumber = atoi(filename.substr(WEBCAM_PREFIX.length()).c_str());
      }
      
      int framenum = 0;
      cv::VideoCapture cap(webcamnumber);
      if (!cap.isOpened())
      {
        std::cerr << "Error opening webcam" << std::endl;
        return 1;
      }

      while (cap.read(frame))
      {
        if (framenum == 0)
          motiondetector.ResetMotionDetection(&frame);
        detectandshow(&alpr, frame, "", outputJson);
        sleep_ms(10);
        framenum++;
      }
    }
    else if (startsWith(filename, "http://") || startsWith(filename, "https://"))
    {
      int framenum = 0;

      VideoBuffer videoBuffer;

      videoBuffer.connect(filename, 5);

      cv::Mat latestFrame;

      while (program_active)
      {
        std::vector<cv::Rect> regionsOfInterest;
        int response = videoBuffer.getLatestFrame(&latestFrame, regionsOfInterest);

        if (response != -1)
        {
          if (framenum == 0)
            motiondetector.ResetMotionDetection(&latestFrame);
          detectandshow(&alpr, latestFrame, "", outputJson);
        }

        // Sleep 10ms
        sleep_ms(10);
        framenum++;
      }

      videoBuffer.disconnect();

      std::cout << "Video processing ended" << std::endl;
    }
    else if (hasEndingInsensitive(filename, ".avi") || hasEndingInsensitive(filename, ".mp4") ||
                                                       hasEndingInsensitive(filename, ".webm") ||
                                                       hasEndingInsensitive(filename, ".flv") || hasEndingInsensitive(filename, ".mjpg") ||
                                                       hasEndingInsensitive(filename, ".mjpeg") ||
             hasEndingInsensitive(filename, ".mkv")
        )

RequestBroker::ProcessResponse ImageRequest::Process(RequestBroker & rb)
{
	VideoBuffer * image = NULL;

	//Have a look at the thumbnail cache
	for(std::deque<std::pair<std::string, VideoBuffer*> >::iterator iter = rb.imageCache.begin(), end = rb.imageCache.end(); iter != end; ++iter)
	{
		if((*iter).first == URL)
		{
			image = (*iter).second;
#ifdef DEBUG
			std::cout << typeid(*this).name() << " " << URL << " found in cache" << std::endl;
#endif
		}
	}

	if(!image)
	{
		if(HTTPContext)
		{
			if(http_async_req_status(HTTPContext))
			{
				pixel * imageData;
				char * data;
				int status, data_size, imgw, imgh;
				data = http_async_req_stop(HTTPContext, &status, &data_size);

				if (status == 200 && data)
				{
					imageData = Graphics::ptif_unpack(data, data_size, &imgw, &imgh);
					free(data);

					if(imageData)
					{
						//Success!
						image = new VideoBuffer(imageData, imgw, imgh);
						free(imageData);
					}
					else
					{
						//Error thumbnail
						image = new VideoBuffer(32, 32);
						image->SetCharacter(14, 14, 'x', 255, 255, 255, 255);
					}

					if(rb.imageCache.size() >= THUMB_CACHE_SIZE)
					{
						//Remove unnecessary from thumbnail cache
						delete rb.imageCache.front().second;
						rb.imageCache.pop_front();
					}
					rb.imageCache.push_back(std::pair<std::string, VideoBuffer*>(URL, image));
				}
				else
				{
	#ifdef DEBUG
					std::cout << typeid(*this).name() << " Request for " << URL << " failed with status " << status << std::endl;
	#endif	
					free(data);

					return RequestBroker::Failed;
				}
			}
		}
		else 
		{
			//Check for ongoing requests
			for(std::vector<Request*>::iterator iter = rb.activeRequests.begin(), end = rb.activeRequests.end(); iter != end; ++iter)
			{
				if((*iter)->Type != Request::Image)
					continue;
				ImageRequest * otherReq = (ImageRequest*)(*iter);
				if(otherReq->URL == URL && otherReq != this)
				{
	#ifdef DEBUG
					std::cout << typeid(*this).name() << " Request for " << URL << " found, appending." << std::endl;
	#endif
					//Add the current listener to the item already being requested
					(*iter)->Children.push_back(this);
					return RequestBroker::Duplicate;
				}
			}

			//If it's not already being requested, request it
	#ifdef DEBUG
			std::cout << typeid(*this).name() << " Creating new request for " << URL << std::endl;
	#endif
			HTTPContext = http_async_req_start(NULL, (char *)URL.c_str(), NULL, 0, 0);
			RequestTime = time(NULL);
		}
	}
	
	if(image)
	{

		//Create a copy, to seperate from the cache
		std::vector<Request *> children(Children.begin(), Children.end());
		Children.clear();

		VideoBuffer * myVB = new VideoBuffer(*image);
//.........这里部分代码省略.........

int main(int argc, char *argv[])
{	
	ui::Engine * engine;
	std::string outputPrefix, inputFilename;
	std::vector<char> inputFile;
	std::string ppmFilename, ptiFilename, ptiSmallFilename, pngFilename, pngSmallFilename;
	std::vector<char> ppmFile, ptiFile, ptiSmallFile, pngFile, pngSmallFile;

	inputFilename = std::string(argv[1]);
	outputPrefix = std::string(argv[2]);

	ppmFilename = outputPrefix+".ppm";
	ptiFilename = outputPrefix+".pti";
	ptiSmallFilename = outputPrefix+"-small.pti";
	pngFilename = outputPrefix+".png";
	pngSmallFilename = outputPrefix+"-small.png";

	readFile(inputFilename, inputFile);

	ui::Engine::Ref().g = new Graphics();
	
	engine = &ui::Engine::Ref();
	engine->Begin(WINDOWW, WINDOWH);

	GameSave * gameSave = NULL;
	try
	{
		gameSave = new GameSave(inputFile);
	}
	catch (ParseException e)
	{
		//Render the save again later or something? I don't know
		if (e.what() == "Save from newer version")
			throw e;
	}

	Simulation * sim = new Simulation();
	Renderer * ren = new Renderer(ui::Engine::Ref().g, sim);

	if (gameSave)
	{
		sim->Load(gameSave);

		//Render save
		ren->decorations_enable = true;
		ren->blackDecorations = true;

		int frame = 15;
		while(frame)
		{
			frame--;
			ren->render_parts();
			ren->render_fire();
			ren->clearScreen(1.0f);
		}
	}
	else
	{
		int w = Graphics::textwidth("Save file invalid")+16, x = (XRES-w)/2, y = (YRES-24)/2;
		ren->drawrect(x, y, w, 24, 192, 192, 192, 255);
		ren->drawtext(x+8, y+8, "Save file invalid", 192, 192, 240, 255);
	}

	ren->RenderBegin();
	ren->RenderEnd();

	VideoBuffer screenBuffer = ren->DumpFrame();
	//ppmFile = format::VideoBufferToPPM(screenBuffer);
	ptiFile = format::VideoBufferToPTI(screenBuffer);
	pngFile = format::VideoBufferToPNG(screenBuffer);

	screenBuffer.Resize(1.0f/3.0f, true);
	ptiSmallFile = format::VideoBufferToPTI(screenBuffer);
	pngSmallFile = format::VideoBufferToPNG(screenBuffer);



	//writeFile(ppmFilename, ppmFile);
	writeFile(ptiFilename, ptiFile);
	writeFile(ptiSmallFilename, ptiSmallFile);
	writeFile(pngFilename, pngFile);
	writeFile(pngSmallFilename, pngSmallFile);
}

void main()
{
    const CubeID cube(0);
    static VideoBuffer vid;
    vid.attach(cube);

    /*
     * Blank the screen. This also blanks the one-pixel region between
     * the bottom of the fractal and the top of the elapsed time indicator
     * below.
     */

    vid.initMode(SOLID_MODE);
    vid.colormap[0] = RGB565::fromRGB(0xFFFFFF);
    System::paint();

    /*
     * We use STAMP mode in a special way here, to do (slow) true-color
     * rendering: The framebuffer is simply set up as an identity mapping
     * that shows each of the 16 colors in our colormap. Now we can put
     * a row of 16 pixels directly into the colormap, and render the screen
     * using 1024 of these little 16x1 pixel "frames".
     *
     * Clearly this is really slow, and this technique is unlikely to be
     * frequently useful, but it's a fun parlour trick :)
     */

    SystemTime startTime = SystemTime::now();

    vid.initMode(STAMP);
    vid.stamp.disableKey();

    auto &fb = vid.stamp.initFB<16,1>();
    for (unsigned i = 0; i < 16; i++)
        fb.plot(vec(i, 0U), i);

    for (unsigned y = 0; y < LCD_height - 9; y++)
        for (unsigned x = 0; x < LCD_width; x += 16) {

            /*
             * Render 16 pixels at a time, into a buffer in RAM.
             */

            static RGB565 pixels[16];

            for (unsigned i = 0; i < 16; i++)
                pixels[i] = calculateMandelbrot(vec(x+i, y));

            /*
             * Now copy to VRAM and start painting. By waiting until
             * now to call finish(), we're allowing the calculation above
             * to run concurrently with the cube's paint operation.
             *
             * Note that our "frames" are actually just tiny pieces of the
             * screen, so we need to avoid the default frame rate limits
             * in order to render at an at all reasonable rate. This is
             * where paintUnlimited() comes into play.
             */

            System::finish();
            vid.stamp.setBox(vec(x,y), vec(16,1));
            vid.colormap.set(pixels);
            System::paintUnlimited();
        }

    /*
     * Use BG0_ROM mode to draw the elapsed time at the bottom of the screen.
     */

    TimeDelta elapsed = SystemTime::now() - startTime;

    String<16> message;
    message << (elapsed.milliseconds() / 1000) << "."
        << Fixed(elapsed.milliseconds() % 1000, 3) << " sec";
    LOG("Elapsed time: %s\n", message.c_str());

    vid.initMode(BG0_ROM);
    vid.bg0rom.text(vec(1,0), message);
    vid.setWindow(LCD_height - 8, 8);

    // Kill time (efficiently)
    while (1)
        System::paint();
}

//.........这里部分代码省略.........
            if (fileExists(filename.c_str()))
            {
                frame = cv::imread( filename );
                detectandshow( &alpr, frame, "", outputJson);
            }
            else
            {
                std::cerr << "Image file not found: " << filename << std::endl;
            }

        }
    }
    else if (filename == "webcam")
    {
        int framenum = 0;
        cv::VideoCapture cap(0);
        if (!cap.isOpened())
        {
            std::cout << "Error opening webcam" << std::endl;
            return 1;
        }

        while (cap.read(frame))
        {
            detectandshow(&alpr, frame, "", outputJson);
            usleep(1000);
            framenum++;
        }
    }
    else if (startsWith(filename, "http://") || startsWith(filename, "https://"))
    {
        int framenum = 0;

        VideoBuffer videoBuffer;

        videoBuffer.connect(filename, 5);

        cv::Mat latestFrame;

        while (program_active)
        {
            int response = videoBuffer.getLatestFrame(&latestFrame);

            if (response != -1)
            {
                detectandshow( &alpr, latestFrame, "", outputJson);
            }

            // Sleep 10ms
            usleep(10000);
        }

        videoBuffer.disconnect();

        std::cout << "Video processing ended" << std::endl;
    }
    else if (hasEndingInsensitive(filename, ".avi") || hasEndingInsensitive(filename, ".mp4") || hasEndingInsensitive(filename, ".webm") ||
             hasEndingInsensitive(filename, ".flv") || hasEndingInsensitive(filename, ".mjpg") || hasEndingInsensitive(filename, ".mjpeg"))
    {
        if (fileExists(filename.c_str()))
        {
            int framenum = 0;

            cv::VideoCapture cap=cv::VideoCapture();
            cap.open(filename);
            cap.set(CV_CAP_PROP_POS_MSEC, seektoms);

//.........这里部分代码省略.........
	long start[10];

  if(ShowVideo) {
    namedWindow("Vision",1);
    //createTrackbar("Thresh Type", "Vision", &type, 4, NULL); // callback not needed
	  //createTrackbar("Min Value", "Vision", &defMin, 255, NULL); // callback not needed
	  //createTrackbar("Max Value", "Vision", &defMax, 255, NULL); // callback not needed
	  createTrackbar("Percent Tall", "Vision", &defTall, 20, NULL); // callback not needed
	  createTrackbar("Percent Narr", "Vision", &defNarr, 20, NULL); // callback not needed
	} else {
	  table->PutNumber("Horizontal Percent Error", defTall);
	  table->PutNumber("Vertical Percent Error", defNarr);
	}
	
	for (int i = 0; i<10; i++)
		start[i] = getmsofday(); // pre-load with 'now'
	for (int i = 0; 1; i++) {
		// Receive key-press updates, it is required if you want to output images,
		// so the task takes a moment to update the display.
		if (waitKey(1) > 0)
			break;
		
    string fileStream = "Mask"; // Default if no table present
		if (table->IsConnected()) {
	    NetworkTable *StreamsTable = table->GetSubTable("File Streams");
	    if (StreamsTable && StreamsTable->ContainsKey("selected")) {
        fileStream = StreamsTable->GetString("selected");
      }
		}
		
		ShowMask = (fileStream == "Mask");
		
		// Grab a frame from the vision API
		VideoBuffer buffer = v.grabFrame();
		
		// Put the frame into an OpenCV image matrix with a single color (gray scale)
		Mat image(height, width, CV_8UC1, buffer.data(), false); // AKA 'Y'

    Mat dst; // this will be a RGB version of the source image
    
#if defined(YOU_WANT_RGB_COLOR_INSTEAD_OF_GREYSCALE)    
		// There is more data after the gray scale (Y) that contains U&V
		Mat cb(height/2, width/2, CV_8UC1, buffer.data()+(height*width), false); // 'U'
		Mat cr(height/2, width/2, CV_8UC1, buffer.data()+(height*width)*5/4, false); // 'V'

    // size up cb and cr to be same as y
    Mat CB;
    resize(cb,CB,cvSize(width,height));
    Mat CR;
    resize(cr,CR,cvSize(width,height));
    
    // empty image same as full (gray scale) image, but 3 channels:
    Mat ycbcr(height,width, CV_8UC3);

    Mat in[] = {image, CB, CR};
    int fromto[] = {0,0, 1,1, 2,2}; // YUV
    
    // mash 3 channels from 2 matrix into a single 3 channel matrix:
    mixChannels(in,3, &ycbcr,1, fromto,3);
    
    // convert that 3 channel YUV matrix into 3 channel RGB (displayable)
    cvtColor(ycbcr,image,CV_YCrCb2RGB);
		if (ShowMask) {
      dst = image.clone(); // make a copy, as we want dst to have the same RGB version
    }
#else

void main()
{
    unsigned fg = BG0ROMDrawable::SOLID_FG ^ BG0ROMDrawable::BLUE;
    unsigned bg = BG0ROMDrawable::SOLID_FG ^ BG0ROMDrawable::BLACK;

    vid.initMode(BG0_ROM);
    vid.attach(cube);
    vid.bg0rom.erase(bg);
    vid.bg0rom.fill(vec(0,0), vec(3,3), fg);

    synthInit();

    float hz = 0;

    while (1) {
        // Scale to [-1, 1]
        auto accel = cube.accel() / 128.f;

        // Glide to the target note (half-steps above or below middle C)
        float note = 261.6f * pow(1.05946f, 8 + round(accel.y * 24.f));
        hz += (note - hz) * 0.4f;

        synthesize(hz, accel.x - 0.2f,
            clamp(accel.x + 0.5f, 0.f, 1.f));

        const Int2 center = LCD_center - vec(24,24)/2;
        vid.bg0rom.setPanning(-(center + accel.xy() * 60.f));
        System::paint();
    }
}