diff options
Diffstat (limited to 'src/capture/xcomposite.c')
| -rw-r--r-- | src/capture/xcomposite.c | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/src/capture/xcomposite.c b/src/capture/xcomposite.c new file mode 100644 index 0000000..755ac92 --- /dev/null +++ b/src/capture/xcomposite.c @@ -0,0 +1,517 @@ +#include "../../include/capture/xcomposite.h" +#include "../../include/gl.h" +#include "../../include/cuda.h" +#include "../../include/window_texture.h" +#include "../../include/time.h" +#include <X11/extensions/Xcomposite.h> +#include <libavutil/hwcontext.h> +#include <libavutil/hwcontext_cuda.h> +#include <libavutil/frame.h> +#include <libavcodec/avcodec.h> + +/* TODO: Proper error checks and cleanups */ + +typedef struct { + gsr_capture_xcomposite_params params; + Display *dpy; + XEvent xev; + bool should_stop; + bool stop_is_error; + bool window_resized; + bool created_hw_frame; + double window_resize_timer; + + vec2i window_size; + vec2i window_pos; + + unsigned int target_texture_id; + vec2i texture_size; + Window composite_window; + WindowTexture window_texture; + + CUgraphicsResource cuda_graphics_resource; + CUarray mapped_array; + + gsr_gl gl; + gsr_cuda cuda; +} gsr_capture_xcomposite; + +static int max_int(int a, int b) { + return a > b ? a : b; +} + +static int min_int(int a, int b) { + return a < b ? a : b; +} + +static void gsr_capture_xcomposite_stop(gsr_capture *cap, AVCodecContext *video_codec_context); + +static Window get_compositor_window(Display *display) { + Window overlay_window = XCompositeGetOverlayWindow(display, DefaultRootWindow(display)); + XCompositeReleaseOverlayWindow(display, DefaultRootWindow(display)); + + Window root_window, parent_window; + Window *children = NULL; + unsigned int num_children = 0; + if(XQueryTree(display, overlay_window, &root_window, &parent_window, &children, &num_children) == 0) + return None; + + Window compositor_window = None; + if(num_children == 1) { + compositor_window = children[0]; + const int screen_width = XWidthOfScreen(DefaultScreenOfDisplay(display)); + const int screen_height = XHeightOfScreen(DefaultScreenOfDisplay(display)); + + XWindowAttributes attr; + if(!XGetWindowAttributes(display, compositor_window, &attr) || attr.width != screen_width || attr.height != screen_height) + compositor_window = None; + } + + if(children) + XFree(children); + + return compositor_window; +} + +/* TODO: check for glx swap control extension string (GLX_EXT_swap_control, etc) */ +static void set_vertical_sync_enabled(Display *display, Window window, gsr_gl *gl, bool enabled) { + int result = 0; + + if(gl->glXSwapIntervalEXT) { + gl->glXSwapIntervalEXT(display, window, enabled ? 1 : 0); + } else if(gl->glXSwapIntervalMESA) { + result = gl->glXSwapIntervalMESA(enabled ? 1 : 0); + } else if(gl->glXSwapIntervalSGI) { + result = gl->glXSwapIntervalSGI(enabled ? 1 : 0); + } else { + static int warned = 0; + if (!warned) { + warned = 1; + fprintf(stderr, "Warning: setting vertical sync not supported\n"); + } + } + + if(result != 0) + fprintf(stderr, "Warning: setting vertical sync failed\n"); +} + +static bool cuda_register_opengl_texture(gsr_capture_xcomposite *cap_xcomp) { + CUresult res; + CUcontext old_ctx; + res = cap_xcomp->cuda.cuCtxPushCurrent_v2(cap_xcomp->cuda.cu_ctx); + res = cap_xcomp->cuda.cuGraphicsGLRegisterImage( + &cap_xcomp->cuda_graphics_resource, cap_xcomp->target_texture_id, GL_TEXTURE_2D, + CU_GRAPHICS_REGISTER_FLAGS_READ_ONLY); + if (res != CUDA_SUCCESS) { + const char *err_str = "unknown"; + cap_xcomp->cuda.cuGetErrorString(res, &err_str); + fprintf(stderr, + "Error: cuGraphicsGLRegisterImage failed, error %s, texture " + "id: %u\n", + err_str, cap_xcomp->target_texture_id); + return false; + } + + /* Get texture */ + res = cap_xcomp->cuda.cuGraphicsResourceSetMapFlags(cap_xcomp->cuda_graphics_resource, CU_GRAPHICS_MAP_RESOURCE_FLAGS_READ_ONLY); + res = cap_xcomp->cuda.cuGraphicsMapResources(1, &cap_xcomp->cuda_graphics_resource, 0); + + /* Map texture to cuda array */ + res = cap_xcomp->cuda.cuGraphicsSubResourceGetMappedArray(&cap_xcomp->mapped_array, cap_xcomp->cuda_graphics_resource, 0, 0); + res = cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return true; +} + +static bool cuda_create_codec_context(gsr_capture_xcomposite *cap_xcomp, AVCodecContext *video_codec_context) { + CUcontext old_ctx; + cap_xcomp->cuda.cuCtxPushCurrent_v2(cap_xcomp->cuda.cu_ctx); + + AVBufferRef *device_ctx = av_hwdevice_ctx_alloc(AV_HWDEVICE_TYPE_CUDA); + if(!device_ctx) { + fprintf(stderr, "Error: Failed to create hardware device context\n"); + return false; + } + + AVHWDeviceContext *hw_device_context = (AVHWDeviceContext*)device_ctx->data; + AVCUDADeviceContext *cuda_device_context = (AVCUDADeviceContext*)hw_device_context->hwctx; + cuda_device_context->cuda_ctx = cap_xcomp->cuda.cu_ctx; + if(av_hwdevice_ctx_init(device_ctx) < 0) { + fprintf(stderr, "Error: Failed to create hardware device context\n"); + av_buffer_unref(&device_ctx); + cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return false; + } + + AVBufferRef *frame_context = av_hwframe_ctx_alloc(device_ctx); + if(!frame_context) { + fprintf(stderr, "Error: Failed to create hwframe context\n"); + av_buffer_unref(&device_ctx); + cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return false; + } + + AVHWFramesContext *hw_frame_context = + (AVHWFramesContext *)frame_context->data; + hw_frame_context->width = video_codec_context->width; + hw_frame_context->height = video_codec_context->height; + hw_frame_context->sw_format = AV_PIX_FMT_0RGB32; + hw_frame_context->format = video_codec_context->pix_fmt; + hw_frame_context->device_ref = device_ctx; + hw_frame_context->device_ctx = (AVHWDeviceContext*)device_ctx->data; + + if (av_hwframe_ctx_init(frame_context) < 0) { + fprintf(stderr, "Error: Failed to initialize hardware frame context " + "(note: ffmpeg version needs to be > 4.0)\n"); + av_buffer_unref(&device_ctx); + av_buffer_unref(&frame_context); + cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return false; + } + + video_codec_context->hw_device_ctx = device_ctx; + video_codec_context->hw_frames_ctx = frame_context; + return true; +} + +static unsigned int gl_create_texture(gsr_capture_xcomposite *cap_xcomp, int width, int height) { + // Generating this second texture is needed because + // cuGraphicsGLRegisterImage cant be used with the texture that is mapped + // directly to the pixmap. + // TODO: Investigate if it's somehow possible to use the pixmap texture + // directly, this should improve performance since only less image copy is + // then needed every frame. + // Ignoring failure for now.. TODO: Show proper error + unsigned int texture_id = 0; + cap_xcomp->gl.glGenTextures(1, &texture_id); + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, texture_id); + cap_xcomp->gl.glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL); + + cap_xcomp->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + cap_xcomp->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + cap_xcomp->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + cap_xcomp->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, 0); + return texture_id; +} + +static int gsr_capture_xcomposite_start(gsr_capture *cap, AVCodecContext *video_codec_context) { + gsr_capture_xcomposite *cap_xcomp = cap->priv; + + XWindowAttributes attr; + if(!XGetWindowAttributes(cap_xcomp->dpy, cap_xcomp->params.window, &attr)) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_start failed: invalid window id: %lu\n", cap_xcomp->params.window); + return -1; + } + + cap_xcomp->window_size.x = max_int(attr.width, 0); + cap_xcomp->window_size.y = max_int(attr.height, 0); + Window c; + XTranslateCoordinates(cap_xcomp->dpy, cap_xcomp->params.window, DefaultRootWindow(cap_xcomp->dpy), 0, 0, &cap_xcomp->window_pos.x, &cap_xcomp->window_pos.y, &c); + + XSelectInput(cap_xcomp->dpy, cap_xcomp->params.window, StructureNotifyMask | ExposureMask); + + if(!gsr_gl_load(&cap_xcomp->gl, cap_xcomp->dpy)) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_start: failed to load opengl\n"); + return -1; + } + + set_vertical_sync_enabled(cap_xcomp->dpy, cap_xcomp->gl.window, &cap_xcomp->gl, false); + if(window_texture_init(&cap_xcomp->window_texture, cap_xcomp->dpy, cap_xcomp->params.window, &cap_xcomp->gl) != 0) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_start: failed get window texture for window %ld\n", cap_xcomp->params.window); + gsr_gl_unload(&cap_xcomp->gl); + return -1; + } + + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, window_texture_get_opengl_texture_id(&cap_xcomp->window_texture)); + cap_xcomp->texture_size.x = 0; + cap_xcomp->texture_size.y = 0; + cap_xcomp->gl.glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &cap_xcomp->texture_size.x); + cap_xcomp->gl.glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &cap_xcomp->texture_size.y); + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, 0); + + cap_xcomp->texture_size.x = max_int(2, cap_xcomp->texture_size.x & ~1); + cap_xcomp->texture_size.y = max_int(2, cap_xcomp->texture_size.y & ~1); + + cap_xcomp->target_texture_id = gl_create_texture(cap_xcomp, cap_xcomp->texture_size.x, cap_xcomp->texture_size.y); + if(cap_xcomp->target_texture_id == 0) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_start: failed to create opengl texture\n"); + gsr_capture_xcomposite_stop(cap, video_codec_context); + return -1; + } + + video_codec_context->width = cap_xcomp->texture_size.x; + video_codec_context->height = cap_xcomp->texture_size.y; + + if(!gsr_cuda_load(&cap_xcomp->cuda)) { + gsr_capture_xcomposite_stop(cap, video_codec_context); + return -1; + } + + if(!cuda_create_codec_context(cap_xcomp, video_codec_context)) { + gsr_capture_xcomposite_stop(cap, video_codec_context); + return -1; + } + + if(!cuda_register_opengl_texture(cap_xcomp)) { + gsr_capture_xcomposite_stop(cap, video_codec_context); + return -1; + } + + cap_xcomp->window_resize_timer = clock_get_monotonic_seconds(); + return 0; +} + +static void gsr_capture_xcomposite_stop(gsr_capture *cap, AVCodecContext *video_codec_context) { + gsr_capture_xcomposite *cap_xcomp = cap->priv; + + window_texture_deinit(&cap_xcomp->window_texture); + + if(cap_xcomp->target_texture_id) { + cap_xcomp->gl.glDeleteTextures(1, &cap_xcomp->target_texture_id); + cap_xcomp->target_texture_id = 0; + } + + if(cap_xcomp->composite_window) { + XCompositeUnredirectWindow(cap_xcomp->dpy, cap_xcomp->composite_window, CompositeRedirectAutomatic); + cap_xcomp->composite_window = None; + } + + av_buffer_unref(&video_codec_context->hw_device_ctx); + av_buffer_unref(&video_codec_context->hw_frames_ctx); + + cap_xcomp->cuda.cuGraphicsUnmapResources(1, &cap_xcomp->cuda_graphics_resource, 0); + cap_xcomp->cuda.cuGraphicsUnregisterResource(cap_xcomp->cuda_graphics_resource); + gsr_cuda_unload(&cap_xcomp->cuda); + + gsr_gl_unload(&cap_xcomp->gl); + if(cap_xcomp->dpy) { + XCloseDisplay(cap_xcomp->dpy); + cap_xcomp->dpy = NULL; + } +} + +static void gsr_capture_xcomposite_tick(gsr_capture *cap, AVCodecContext *video_codec_context, AVFrame **frame) { + gsr_capture_xcomposite *cap_xcomp = cap->priv; + + cap_xcomp->gl.glClear(GL_COLOR_BUFFER_BIT); + + if(!cap_xcomp->created_hw_frame) { + CUcontext old_ctx; + cap_xcomp->cuda.cuCtxPushCurrent_v2(cap_xcomp->cuda.cu_ctx); + + if(av_hwframe_get_buffer(video_codec_context->hw_frames_ctx, *frame, 0) < 0) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_tick: av_hwframe_get_buffer failed\n"); + cap_xcomp->should_stop = true; + cap_xcomp->stop_is_error = true; + cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return; + } + + cap_xcomp->created_hw_frame = true; + cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + } + + if(XCheckTypedWindowEvent(cap_xcomp->dpy, cap_xcomp->params.window, DestroyNotify, &cap_xcomp->xev)) { + cap_xcomp->should_stop = true; + cap_xcomp->stop_is_error = false; + } + + if(XCheckTypedWindowEvent(cap_xcomp->dpy, cap_xcomp->params.window, Expose, &cap_xcomp->xev) && cap_xcomp->xev.xexpose.count == 0) { + cap_xcomp->window_resize_timer = clock_get_monotonic_seconds(); + cap_xcomp->window_resized = true; + } + + if(XCheckTypedWindowEvent(cap_xcomp->dpy, cap_xcomp->params.window, ConfigureNotify, &cap_xcomp->xev) && cap_xcomp->xev.xconfigure.window == cap_xcomp->params.window) { + while(XCheckTypedWindowEvent(cap_xcomp->dpy, cap_xcomp->params.window, ConfigureNotify, &cap_xcomp->xev)) {} + Window c; + XTranslateCoordinates(cap_xcomp->dpy, cap_xcomp->params.window, DefaultRootWindow(cap_xcomp->dpy), 0, 0, &cap_xcomp->xev.xconfigure.x, &cap_xcomp->xev.xconfigure.y, &c); + cap_xcomp->window_pos.x = cap_xcomp->xev.xconfigure.x; + cap_xcomp->window_pos.y = cap_xcomp->xev.xconfigure.y; + + /* Window resize */ + if(cap_xcomp->xev.xconfigure.width != cap_xcomp->window_size.x || cap_xcomp->xev.xconfigure.height != cap_xcomp->window_size.y) { + cap_xcomp->window_size.x = max_int(cap_xcomp->xev.xconfigure.width, 0); + cap_xcomp->window_size.y = max_int(cap_xcomp->xev.xconfigure.height, 0); + cap_xcomp->window_resize_timer = clock_get_monotonic_seconds(); + cap_xcomp->window_resized = true; + } + } + + const double window_resize_timeout = 1.0; // 1 second + if(cap_xcomp->window_resized && clock_get_monotonic_seconds() - cap_xcomp->window_resize_timer >= window_resize_timeout) { + cap_xcomp->window_resized = false; + fprintf(stderr, "Resize window!\n"); + if(window_texture_on_resize(&cap_xcomp->window_texture) != 0) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_tick: window_texture_on_resize failed\n"); + cap_xcomp->should_stop = true; + cap_xcomp->stop_is_error = true; + return; + } + + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, window_texture_get_opengl_texture_id(&cap_xcomp->window_texture)); + cap_xcomp->texture_size.x = 0; + cap_xcomp->texture_size.y = 0; + cap_xcomp->gl.glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &cap_xcomp->texture_size.x); + cap_xcomp->gl.glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &cap_xcomp->texture_size.y); + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, 0); + + cap_xcomp->texture_size.x = min_int(video_codec_context->width, max_int(2, cap_xcomp->texture_size.x & ~1)); + cap_xcomp->texture_size.y = min_int(video_codec_context->height, max_int(2, cap_xcomp->texture_size.y & ~1)); + + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, cap_xcomp->target_texture_id); + cap_xcomp->gl.glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, cap_xcomp->texture_size.x, cap_xcomp->texture_size.y, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL); + cap_xcomp->gl.glBindTexture(GL_TEXTURE_2D, 0); + + CUcontext old_ctx; + CUresult res = cap_xcomp->cuda.cuCtxPushCurrent_v2(cap_xcomp->cuda.cu_ctx); + + cap_xcomp->cuda.cuGraphicsUnmapResources(1, &cap_xcomp->cuda_graphics_resource, 0); + cap_xcomp->cuda.cuGraphicsUnregisterResource(cap_xcomp->cuda_graphics_resource); + res = cap_xcomp->cuda.cuGraphicsGLRegisterImage(&cap_xcomp->cuda_graphics_resource, cap_xcomp->target_texture_id, GL_TEXTURE_2D, CU_GRAPHICS_REGISTER_FLAGS_READ_ONLY); + if (res != CUDA_SUCCESS) { + const char *err_str = "unknown"; + cap_xcomp->cuda.cuGetErrorString(res, &err_str); + fprintf(stderr, "gsr error: gsr_capture_xcomposite_tick: cuGraphicsGLRegisterImage failed, error %s, texture id: %u\n", err_str, cap_xcomp->target_texture_id); + cap_xcomp->should_stop = true; + cap_xcomp->stop_is_error = true; + res = cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return; + } + + res = cap_xcomp->cuda.cuGraphicsResourceSetMapFlags(cap_xcomp->cuda_graphics_resource, CU_GRAPHICS_MAP_RESOURCE_FLAGS_READ_ONLY); + res = cap_xcomp->cuda.cuGraphicsMapResources(1, &cap_xcomp->cuda_graphics_resource, 0); + res = cap_xcomp->cuda.cuGraphicsSubResourceGetMappedArray(&cap_xcomp->mapped_array, cap_xcomp->cuda_graphics_resource, 0, 0); + + av_frame_free(frame); + *frame = av_frame_alloc(); + if(!frame) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_tick: failed to allocate frame\n"); + cap_xcomp->should_stop = true; + cap_xcomp->stop_is_error = true; + res = cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return; + } + (*frame)->format = video_codec_context->pix_fmt; + (*frame)->width = video_codec_context->width; + (*frame)->height = video_codec_context->height; + + if(av_hwframe_get_buffer(video_codec_context->hw_frames_ctx, *frame, 0) < 0) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_tick: av_hwframe_get_buffer failed\n"); + cap_xcomp->should_stop = true; + cap_xcomp->stop_is_error = true; + res = cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + return; + } + + // Make it completely black to clear unused parts + // TODO: cuMemsetD32? + res = cap_xcomp->cuda.cuMemsetD8_v2((CUdeviceptr)(*frame)->data[0], 0, (*frame)->width * (*frame)->height * 4); + res = cap_xcomp->cuda.cuCtxPopCurrent_v2(&old_ctx); + } +} + +static bool gsr_capture_xcomposite_should_stop(gsr_capture *cap, bool *err) { + gsr_capture_xcomposite *cap_xcomp = cap->priv; + if(cap_xcomp->should_stop) { + if(err) + *err = cap_xcomp->stop_is_error; + return true; + } + + if(err) + *err = false; + return false; +} + +static int gsr_capture_xcomposite_capture(gsr_capture *cap, AVFrame *frame) { + gsr_capture_xcomposite *cap_xcomp = cap->priv; + + // TODO: Use a framebuffer instead. glCopyImageSubData requires opengl 4.2 + vec2i source_pos = { 0, 0 }; + vec2i source_size = cap_xcomp->texture_size; + + // Requires opengl 4.2... TODO: Replace with earlier opengl if opengl < 4.2. + cap_xcomp->gl.glCopyImageSubData( + window_texture_get_opengl_texture_id(&cap_xcomp->window_texture), GL_TEXTURE_2D, 0, source_pos.x, source_pos.y, 0, + cap_xcomp->target_texture_id, GL_TEXTURE_2D, 0, 0, 0, 0, + source_size.x, source_size.y, 1); + unsigned int err = cap_xcomp->gl.glGetError(); + if(err != 0) { + static bool error_shown = false; + if(!error_shown) { + error_shown = true; + fprintf(stderr, "Error: glCopyImageSubData failed, gl error: %d\n", err); + } + } + cap_xcomp->gl.glXSwapBuffers(cap_xcomp->dpy, cap_xcomp->gl.window); + // TODO: Remove this copy, which is only possible by using nvenc directly and encoding window_pixmap.target_texture_id + + frame->linesize[0] = frame->width * 4; + + CUDA_MEMCPY2D memcpy_struct; + memcpy_struct.srcXInBytes = 0; + memcpy_struct.srcY = 0; + memcpy_struct.srcMemoryType = CU_MEMORYTYPE_ARRAY; + + memcpy_struct.dstXInBytes = 0; + memcpy_struct.dstY = 0; + memcpy_struct.dstMemoryType = CU_MEMORYTYPE_DEVICE; + + memcpy_struct.srcArray = cap_xcomp->mapped_array; + memcpy_struct.dstDevice = (CUdeviceptr)frame->data[0]; + memcpy_struct.dstPitch = frame->linesize[0]; + memcpy_struct.WidthInBytes = frame->width * 4; + memcpy_struct.Height = frame->height; + cap_xcomp->cuda.cuMemcpy2D_v2(&memcpy_struct); + + return 0; +} + +static void gsr_capture_xcomposite_destroy(gsr_capture *cap, AVCodecContext *video_codec_context) { + gsr_capture_xcomposite_stop(cap, video_codec_context); + if(cap->priv) { + free(cap->priv); + cap->priv = NULL; + } + free(cap); +} + +gsr_capture* gsr_capture_xcomposite_create(const gsr_capture_xcomposite_params *params) { + if(!params) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_create params is NULL\n"); + return NULL; + } + + gsr_capture *cap = calloc(1, sizeof(gsr_capture)); + if(!cap) + return NULL; + + gsr_capture_xcomposite *cap_xcomp = calloc(1, sizeof(gsr_capture_xcomposite)); + if(!cap_xcomp) { + free(cap); + return NULL; + } + + Display *display = XOpenDisplay(NULL); + if(!display) { + fprintf(stderr, "gsr error: gsr_capture_xcomposite_create failed: XOpenDisplay failed\n"); + free(cap); + free(cap_xcomp); + return NULL; + } + + cap_xcomp->dpy = display; + cap_xcomp->params = *params; + + *cap = (gsr_capture) { + .start = gsr_capture_xcomposite_start, + .tick = gsr_capture_xcomposite_tick, + .should_stop = gsr_capture_xcomposite_should_stop, + .capture = gsr_capture_xcomposite_capture, + .destroy = gsr_capture_xcomposite_destroy, + .priv = cap_xcomp + }; + + return cap; +} |