483 lines
12 KiB
C++
483 lines
12 KiB
C++
#include <utils/Logger.h>
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#include <grabber/X11Grabber.h>
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#include <xcb/randr.h>
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#include <xcb/xcb_event.h>
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// Constants
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namespace {
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const bool verbose = false;
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} //End of constants
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X11Grabber::X11Grabber(int cropLeft, int cropRight, int cropTop, int cropBottom)
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: Grabber("X11GRABBER", cropLeft, cropRight, cropTop, cropBottom)
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, _x11Display(nullptr)
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, _xImage(nullptr)
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, _pixmap(None)
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, _srcFormat(nullptr)
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, _dstFormat(nullptr)
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, _srcPicture(None)
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, _dstPicture(None)
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, _calculatedWidth(0)
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, _calculatedHeight(0)
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, _src_x(cropLeft)
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, _src_y(cropTop)
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, _XShmAvailable(false)
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, _XRenderAvailable(false)
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, _XRandRAvailable(false)
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, _isWayland (false)
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, _logger{}
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, _image(0,0)
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{
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_logger = Logger::getInstance("X11");
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_useImageResampler = false;
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_imageResampler.setCropping(0, 0, 0, 0); // cropping is performed by XRender, XShmGetImage or XGetImage
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memset(&_pictAttr, 0, sizeof(_pictAttr));
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_pictAttr.repeat = RepeatNone;
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}
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X11Grabber::~X11Grabber()
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{
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if (_x11Display != nullptr)
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{
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freeResources();
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XCloseDisplay(_x11Display);
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}
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}
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void X11Grabber::freeResources()
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{
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// Cleanup allocated resources of the X11 grab
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if (_xImage != nullptr)
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{
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XDestroyImage(_xImage);
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}
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if (_XRandRAvailable)
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{
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qApp->removeNativeEventFilter(this);
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}
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if(_XShmAvailable)
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{
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XShmDetach(_x11Display, &_shminfo);
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shmdt(_shminfo.shmaddr);
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shmctl(_shminfo.shmid, IPC_RMID, 0);
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}
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if (_XRenderAvailable)
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{
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XRenderFreePicture(_x11Display, _srcPicture);
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XRenderFreePicture(_x11Display, _dstPicture);
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XFreePixmap(_x11Display, _pixmap);
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}
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}
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void X11Grabber::setupResources()
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{
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if (_XRandRAvailable)
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{
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qApp->installNativeEventFilter(this);
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}
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if(_XShmAvailable)
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{
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_xImage = XShmCreateImage(_x11Display, _windowAttr.visual, _windowAttr.depth, ZPixmap, NULL, &_shminfo, _calculatedWidth, _calculatedHeight);
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_shminfo.shmid = shmget(IPC_PRIVATE, (size_t) _xImage->bytes_per_line * _xImage->height, IPC_CREAT|0777);
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_xImage->data = (char*)shmat(_shminfo.shmid,0,0);
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_shminfo.shmaddr = _xImage->data;
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_shminfo.readOnly = False;
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XShmAttach(_x11Display, &_shminfo);
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}
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if (_XRenderAvailable)
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{
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_useImageResampler = false;
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_imageResampler.setHorizontalPixelDecimation(1);
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_imageResampler.setVerticalPixelDecimation(1);
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if(_XShmPixmapAvailable)
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{
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_pixmap = XShmCreatePixmap(_x11Display, _window, _xImage->data, &_shminfo, _calculatedWidth, _calculatedHeight, _windowAttr.depth);
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}
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else
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{
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_pixmap = XCreatePixmap(_x11Display, _window, _calculatedWidth, _calculatedHeight, _windowAttr.depth);
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}
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_srcFormat = XRenderFindVisualFormat(_x11Display, _windowAttr.visual);
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_dstFormat = XRenderFindVisualFormat(_x11Display, _windowAttr.visual);
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_srcPicture = XRenderCreatePicture(_x11Display, _window, _srcFormat, CPRepeat, &_pictAttr);
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_dstPicture = XRenderCreatePicture(_x11Display, _pixmap, _dstFormat, CPRepeat, &_pictAttr);
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XRenderSetPictureFilter(_x11Display, _srcPicture, FilterBilinear, NULL, 0);
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}
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else
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{
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_useImageResampler = true;
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_imageResampler.setHorizontalPixelDecimation(_pixelDecimation);
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_imageResampler.setVerticalPixelDecimation(_pixelDecimation);
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}
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}
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bool X11Grabber::open()
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{
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bool rc = false;
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if (getenv("WAYLAND_DISPLAY") != nullptr)
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{
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_isWayland = true;
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}
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else
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{
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_x11Display = XOpenDisplay(nullptr);
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if (_x11Display != nullptr)
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{
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rc = true;
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}
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}
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return rc;
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}
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bool X11Grabber::setupDisplay()
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{
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bool result = false;
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if ( ! open() )
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{
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if ( _isWayland )
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{
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Error(_log, "Grabber does not work under Wayland!");
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}
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else
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{
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if (getenv("DISPLAY") != nullptr)
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{
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Error(_log, "Unable to open display [%s]",getenv("DISPLAY"));
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}
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else
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{
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Error(_log, "DISPLAY environment variable not set");
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}
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}
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}
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else
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{
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_window = DefaultRootWindow(_x11Display);
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int dummy, pixmaps_supported;
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_XRandRAvailable = XRRQueryExtension(_x11Display, &_XRandREventBase, &dummy);
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_XRenderAvailable = XRenderQueryExtension(_x11Display, &dummy, &dummy);
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_XShmAvailable = XShmQueryExtension(_x11Display);
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XShmQueryVersion(_x11Display, &dummy, &dummy, &pixmaps_supported);
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_XShmPixmapAvailable = pixmaps_supported && XShmPixmapFormat(_x11Display) == ZPixmap;
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Info(_log, "%s", QSTRING_CSTR(QString("XRandR=[%1] XRender=[%2] XShm=[%3] XPixmap=[%4]")
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.arg(_XRandRAvailable ? "available" : "unavailable",
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_XRenderAvailable ? "available" : "unavailable",
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_XShmAvailable ? "available" : "unavailable",
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_XShmPixmapAvailable ? "available" : "unavailable"))
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);
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result = (updateScreenDimensions(true) >=0);
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ErrorIf(!result, _log, "X11 Grabber start failed");
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setEnabled(result);
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}
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return result;
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}
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int X11Grabber::grabFrame(Image<ColorRgb> & image, bool forceUpdate)
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{
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if (!_isEnabled) return 0;
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if (forceUpdate)
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updateScreenDimensions(forceUpdate);
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if (_XRenderAvailable)
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{
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double scale_x = static_cast<double>(_windowAttr.width / _pixelDecimation) / static_cast<double>(_windowAttr.width);
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double scale_y = static_cast<double>(_windowAttr.height / _pixelDecimation) / static_cast<double>(_windowAttr.height);
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double scale = qMin(scale_y, scale_x);
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_transform =
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{
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{
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{
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XDoubleToFixed(1),
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XDoubleToFixed(0),
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XDoubleToFixed(0)
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},
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{
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XDoubleToFixed(0),
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XDoubleToFixed(1),
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XDoubleToFixed(0)
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},
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{
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XDoubleToFixed(0),
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XDoubleToFixed(0),
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XDoubleToFixed(scale)
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}
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}
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};
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XRenderSetPictureTransform (_x11Display, _srcPicture, &_transform);
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// display, op, src, mask, dest, src_x = cropLeft,
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// src_y = cropTop, mask_x, mask_y, dest_x, dest_y, width, height
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XRenderComposite(
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_x11Display, PictOpSrc, _srcPicture, None, _dstPicture, ( _src_x/_pixelDecimation),
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(_src_y/_pixelDecimation), 0, 0, 0, 0, _calculatedWidth, _calculatedHeight);
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XSync(_x11Display, False);
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if (_XShmAvailable)
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{
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XShmGetImage(_x11Display, _pixmap, _xImage, 0, 0, AllPlanes);
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}
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else
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{
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_xImage = XGetImage(_x11Display, _pixmap, 0, 0, _calculatedWidth, _calculatedHeight, AllPlanes, ZPixmap);
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}
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}
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else if (_XShmAvailable)
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{
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// use xshm
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XShmGetImage(_x11Display, _window, _xImage, _src_x, _src_y, AllPlanes);
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}
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else
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{
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// all things done by xgetimage
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_xImage = XGetImage(_x11Display, _window, _src_x, _src_y, _calculatedWidth, _calculatedHeight, AllPlanes, ZPixmap);
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}
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if (_xImage == nullptr)
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{
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Error(_log, "Grab Failed!");
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return -1;
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}
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_imageResampler.processImage(reinterpret_cast<const uint8_t *>(_xImage->data), _xImage->width, _xImage->height, _xImage->bytes_per_line, PixelFormat::BGR32, image);
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return 0;
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}
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int X11Grabber::updateScreenDimensions(bool force)
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{
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const Status status = XGetWindowAttributes(_x11Display, _window, &_windowAttr);
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if (status == 0)
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{
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Error(_log, "Failed to obtain window attributes");
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return -1;
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}
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if (!force && _width == _windowAttr.width && _height == _windowAttr.height)
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{
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// No update required
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return 0;
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}
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if (_width || _height)
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{
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freeResources();
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}
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Info(_log, "Update of screen resolution: [%dx%d] to [%dx%d]", _width, _height, _windowAttr.width, _windowAttr.height);
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_width = _windowAttr.width;
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_height = _windowAttr.height;
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int width=0;
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int height=0;
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// Image scaling is performed by XRender when available, otherwise by ImageResampler
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if (_XRenderAvailable)
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{
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width = (_width > (_cropLeft + _cropRight))
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? ((_width - _cropLeft - _cropRight) / _pixelDecimation)
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: _width / _pixelDecimation;
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height = (_height > (_cropTop + _cropBottom))
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? ((_height - _cropTop - _cropBottom) / _pixelDecimation)
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: _height / _pixelDecimation;
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Info(_log, "Using XRender for grabbing");
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}
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else
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{
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width = (_width > (_cropLeft + _cropRight))
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? (_width - _cropLeft - _cropRight)
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: _width;
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height = (_height > (_cropTop + _cropBottom))
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? (_height - _cropTop - _cropBottom)
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: _height;
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Info(_log, "Using XGetImage for grabbing");
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}
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// calculate final image dimensions and adjust top/left cropping in 3D modes
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switch (_videoMode)
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{
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case VideoMode::VIDEO_3DSBS:
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_calculatedWidth = width /2;
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_calculatedHeight = height;
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_src_x = _cropLeft / 2;
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_src_y = _cropTop;
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break;
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case VideoMode::VIDEO_3DTAB:
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_calculatedWidth = width;
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_calculatedHeight = height / 2;
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_src_x = _cropLeft;
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_src_y = _cropTop / 2;
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break;
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case VideoMode::VIDEO_2D:
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default:
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_calculatedWidth = width;
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_calculatedHeight = height;
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_src_x = _cropLeft;
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_src_y = _cropTop;
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break;
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}
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Info(_log, "Update output image resolution: [%dx%d] to [%dx%d]", _image.width(), _image.height(), _calculatedWidth, _calculatedHeight);
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_image.resize(_calculatedWidth, _calculatedHeight);
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setupResources();
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return 1;
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}
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void X11Grabber::setVideoMode(VideoMode mode)
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{
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Grabber::setVideoMode(mode);
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if(_x11Display != nullptr)
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{
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updateScreenDimensions(true);
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}
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}
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bool X11Grabber::setPixelDecimation(int pixelDecimation)
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{
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bool rc (true);
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if (Grabber::setPixelDecimation(pixelDecimation))
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{
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if(_x11Display != nullptr)
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{
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if ( updateScreenDimensions(true) < 0 )
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{
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rc = false;
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}
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}
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}
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return rc;
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}
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void X11Grabber::setCropping(int cropLeft, int cropRight, int cropTop, int cropBottom)
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{
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Grabber::setCropping(cropLeft, cropRight, cropTop, cropBottom);
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if(_x11Display != nullptr)
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{
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updateScreenDimensions(true); // segfault on init
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}
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}
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#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
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bool X11Grabber::nativeEventFilter(const QByteArray & eventType, void * message, qintptr * /*result*/)
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#else
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bool X11Grabber::nativeEventFilter(const QByteArray & eventType, void * message, long int * /*result*/)
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#endif
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{
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if (!_XRandRAvailable || eventType != "xcb_generic_event_t") {
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return false;
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}
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xcb_generic_event_t *e = static_cast<xcb_generic_event_t*>(message);
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const uint8_t xEventType = XCB_EVENT_RESPONSE_TYPE(e);
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if (xEventType == _XRandREventBase + XCB_RANDR_SCREEN_CHANGE_NOTIFY)
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{
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updateScreenDimensions(true);
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}
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return false;
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}
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QJsonObject X11Grabber::discover(const QJsonObject& params)
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{
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DebugIf(verbose, _log, "params: [%s]", QString(QJsonDocument(params).toJson(QJsonDocument::Compact)).toUtf8().constData());
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QJsonObject inputsDiscovered;
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if ( open() )
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{
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inputsDiscovered["device"] = "x11";
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inputsDiscovered["device_name"] = "X11";
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inputsDiscovered["type"] = "screen";
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QJsonArray video_inputs;
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if (_x11Display != nullptr)
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{
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QJsonArray fps = { 1, 5, 10, 15, 20, 25, 30, 40, 50, 60 };
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// Iterate through all X screens
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for (int i = 0; i < XScreenCount(_x11Display); ++i)
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{
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_window = DefaultRootWindow(_x11Display);
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const Status status = XGetWindowAttributes(_x11Display, _window, &_windowAttr);
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if (status == 0)
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{
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Debug(_log, "Failed to obtain window attributes");
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}
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else
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{
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QJsonObject in;
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QString displayName;
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char* name;
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if ( XFetchName(_x11Display, _window, &name) > 0 )
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{
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displayName = name;
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}
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else {
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displayName = QString("Display:%1").arg(i);
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}
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in["name"] = displayName;
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in["inputIdx"] = i;
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QJsonArray formats;
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QJsonArray resolutionArray;
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QJsonObject format;
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QJsonObject resolution;
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resolution["width"] = _windowAttr.width;
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resolution["height"] = _windowAttr.height;
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resolution["fps"] = fps;
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resolutionArray.append(resolution);
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format["resolutions"] = resolutionArray;
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formats.append(format);
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in["formats"] = formats;
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video_inputs.append(in);
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}
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}
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if ( !video_inputs.isEmpty() )
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{
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inputsDiscovered["video_inputs"] = video_inputs;
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QJsonObject defaults, video_inputs_default, resolution_default;
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resolution_default["fps"] = _fps;
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video_inputs_default["resolution"] = resolution_default;
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video_inputs_default["inputIdx"] = 0;
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defaults["video_input"] = video_inputs_default;
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inputsDiscovered["default"] = defaults;
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}
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}
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}
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DebugIf(verbose, _log, "device: [%s]", QString(QJsonDocument(inputsDiscovered).toJson(QJsonDocument::Compact)).toUtf8().constData());
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return inputsDiscovered;
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}
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