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[c-host] linux: initial xcb capture
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@ -34,6 +34,7 @@ else
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ifeq ($(USE_XCB), 1)
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CFLAGS += -DUSE_XCB
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LIBS += -lxcb -lxcb-shm -lXfixes
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OBJS += linux/capture/xcb.o
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endif
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endif
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184
c-host/linux/capture/xcb.c
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184
c-host/linux/capture/xcb.c
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@ -0,0 +1,184 @@
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/*
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Looking Glass - KVM FrameRelay (KVMFR) Client
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Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "capture/interface.h"
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#include "debug.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <xcb/shm.h>
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#include <xcb/xfixes.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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struct xcb
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{
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bool initialized;
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xcb_connection_t * xcb;
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xcb_screen_t * xcbScreen;
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uint32_t seg;
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int shmID;
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void * data;
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unsigned int width;
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unsigned int height;
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xcb_shm_get_image_cookie_t imgC;
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xcb_xfixes_get_cursor_image_cookie_t curC;
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};
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struct xcb * this = NULL;
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// forwards
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static bool xcb_deinit();
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static unsigned int xcb_getMaxFrameSize();
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// implementation
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static const char * xcb_getName()
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{
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return "XCB";
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}
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static bool xcb_create()
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{
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assert(!this);
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this = (struct xcb *)calloc(sizeof(struct xcb), 1);
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this->shmID = -1;
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this->data = (void *)-1;
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return true;
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}
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static bool xcb_init()
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{
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assert(this);
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assert(!this->initialized);
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this->xcb = xcb_connect(NULL, NULL);
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if (!this->xcb || xcb_connection_has_error(this->xcb))
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{
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DEBUG_ERROR("Unable to open the X display");
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goto fail;
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}
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if (!xcb_get_extension_data(this->xcb, &xcb_shm_id)->present)
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{
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DEBUG_ERROR("Missing the SHM extension");
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goto fail;
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}
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xcb_screen_iterator_t iter;
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iter = xcb_setup_roots_iterator(xcb_get_setup(this->xcb));
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this->xcbScreen = iter.data;
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this->width = iter.data->width_in_pixels;
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this->height = iter.data->height_in_pixels;
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DEBUG_INFO("Frame Size : %u x %u", this->width, this->height);
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this->seg = xcb_generate_id(this->xcb);
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this->shmID = shmget(IPC_PRIVATE, xcb_getMaxFrameSize(), IPC_CREAT | 0777);
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if (this->shmID == -1)
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{
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DEBUG_ERROR("shmget failed");
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goto fail;
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}
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xcb_shm_attach(this->xcb, this->seg ,this->shmID, false);
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this->data = shmat(this->shmID, NULL, 0);
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if ((uintptr_t)this->data == -1)
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{
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DEBUG_ERROR("shmat failed");
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goto fail;
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}
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DEBUG_INFO("Frame Data : 0x%" PRIXPTR, (uintptr_t)this->data);
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this->initialized = true;
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return true;
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fail:
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xcb_deinit();
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return false;
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}
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static bool xcb_deinit()
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{
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assert(this);
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if ((uintptr_t)this->data != -1)
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{
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shmdt(this->data);
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this->data = (void *)-1;
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}
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if (this->shmID != -1)
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{
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shmctl(this->shmID, IPC_RMID, NULL);
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this->shmID = -1;
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}
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if (this->xcb)
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{
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xcb_disconnect(this->xcb);
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this->xcb = NULL;
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}
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this->initialized = false;
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return false;
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}
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static void xcb_free()
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{
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free(this);
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this = NULL;
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}
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static unsigned int xcb_getMaxFrameSize()
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{
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return this->width * this->height * 4;
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}
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static CaptureResult xcb_capture(bool * hasFrameUpdate, bool * hasPointerUpdate)
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{
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assert(this);
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assert(this->initialized);
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this->imgC = xcb_shm_get_image_unchecked(
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this->xcb,
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this->xcbScreen->root,
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0, 0,
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this->width,
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this->height,
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~0,
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XCB_IMAGE_FORMAT_Z_PIXMAP,
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this->seg,
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0);
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*hasFrameUpdate = true;
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return CAPTURE_RESULT_OK;
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}
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struct CaptureInterface Capture_XCB =
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{
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.getName = xcb_getName,
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.create = xcb_create,
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.init = xcb_init,
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.deinit = xcb_deinit,
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.free = xcb_free,
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.getMaxFrameSize = xcb_getMaxFrameSize,
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.capture = xcb_capture
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};
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