Added creating / destroying outputs on a multi-backend + headless backend

See `hyprctl output`.

hyprctl/main.cpp

@@ -217,6 +217,21 @@ int setcursorRequest(int argc, char** argv) {
     return 0;
 }
 
+int outputRequest(int argc, char** argv) {
+    if (argc < 4) {
+        std::cout << "Usage: hyprctl output <mode> <name>\n\
+            creates / destroys a fake output\n\
+            with create, name is the backend name to use (available: auto, x11, wayland, headless)\n\
+            with destroy, name is the output name to destroy";
+        return 1;
+    }
+
+    std::string rq = "output " + std::string(argv[2]) + " " + std::string(argv[3]);
+
+    request(rq);
+    return 0;
+}
+
 void batchRequest(std::string arg) {
     std::string rq = "[[BATCH]]" + arg.substr(arg.find_first_of(" ") + 1);
 
@@ -290,6 +305,7 @@ int main(int argc, char** argv) {
     else if (fullRequest.contains("/reload")) request(fullRequest);
     else if (fullRequest.contains("/getoption")) request(fullRequest);
     else if (fullRequest.contains("/cursorpos")) request(fullRequest);
+    else if (fullRequest.contains("/output")) exitStatus = outputRequest(argc, argv);
     else if (fullRequest.contains("/setcursor")) exitStatus = setcursorRequest(argc, argv);
     else if (fullRequest.contains("/dispatch")) exitStatus = dispatchRequest(argc, argv);
     else if (fullRequest.contains("/keyword")) exitStatus = keywordRequest(argc, argv);

src/Compositor.cpp

@@ -180,6 +180,15 @@ CCompositor::CCompositor() {
     m_sWLRIMEMgr = wlr_input_method_manager_v2_create(m_sWLDisplay);
 
     m_sWLRActivation = wlr_xdg_activation_v1_create(m_sWLDisplay);
+
+    m_sWLRHeadlessBackend = wlr_headless_backend_create(m_sWLDisplay);
+
+    if (!m_sWLRHeadlessBackend) {
+        Debug::log(CRIT, "Couldn't create the headless backend");
+        throw std::runtime_error("wlr_headless_backend_create() failed!");
+    }
+
+    wlr_multi_backend_add(m_sWLRBackend, m_sWLRHeadlessBackend);
 }
 
 CCompositor::~CCompositor() {

src/Compositor.hpp

@@ -71,6 +71,7 @@ public:
     wlr_text_input_manager_v3*       m_sWLRTextInputMgr;
     wlr_xdg_activation_v1*           m_sWLRActivation;
     wlr_linux_dmabuf_v1*             m_sWLRLinuxDMABuf;
+    wlr_backend*                     m_sWLRHeadlessBackend;
     // ------------------------------------------------- //
 
 

src/debug/HyprCtl.cpp

@@ -743,6 +743,86 @@ R"#(
     }
 }
 
+void createOutputIter(wlr_backend* backend, void* data) {
+    const auto DATA = (std::pair<std::string, bool>*)data;
+
+    if (DATA->second)
+        return;
+
+    if (DATA->first.empty() || DATA->first == "auto") {
+        if (wlr_backend_is_wl(backend)) {
+            wlr_wl_output_create(backend);
+            DATA->second = true;
+        } else if (wlr_backend_is_x11(backend)) {
+            wlr_x11_output_create(backend);
+            DATA->second = true;
+        } else if (wlr_backend_is_headless(backend)) {
+            wlr_headless_add_output(backend, 1920, 1080);
+            DATA->second = true;
+        }
+    } else {
+        if (wlr_backend_is_wl(backend) && DATA->first == "wayland") {
+            wlr_wl_output_create(backend);
+            DATA->second = true;
+        } else if (wlr_backend_is_x11(backend) && DATA->first == "x11") {
+            wlr_x11_output_create(backend);
+            DATA->second = true;
+        } else if (wlr_backend_is_headless(backend) && DATA->first == "headless") {
+            wlr_headless_add_output(backend, 1920, 1080);
+            DATA->second = true;
+        }
+    }
+}
+
+std::string dispatchOutput(std::string request) {
+    std::string curitem = "";
+
+    auto nextItem = [&]() {
+        auto idx = request.find_first_of(' ');
+
+        if (idx != std::string::npos) {
+            curitem = request.substr(0, idx);
+            request = request.substr(idx + 1);
+        } else {
+            curitem = request;
+            request = "";
+        }
+
+        curitem = removeBeginEndSpacesTabs(curitem);
+    };
+
+    nextItem();
+    nextItem();
+
+    const auto MODE = curitem;
+
+    nextItem();
+
+    const auto NAME = curitem;
+
+    if (MODE == "create" || MODE == "add") {
+        std::pair<std::string, bool> result = { NAME, false };
+
+        wlr_multi_for_each_backend(g_pCompositor->m_sWLRBackend, createOutputIter, &result);
+
+        if (!result.second)
+            return "no backend replied to the request";
+
+    } else if (MODE == "destroy" || MODE == "remove") {
+        const auto PMONITOR = g_pCompositor->getMonitorFromName(NAME);
+
+        if (!PMONITOR)
+            return "output not found";
+
+        if (!PMONITOR->createdByUser)
+            return "cannot remove a real display. Use the monitor keyword.";
+
+        wlr_output_destroy(PMONITOR->output);
+    }
+
+    return "ok";
+}
+
 std::string getReply(std::string request) {
     auto format = HyprCtl::FORMAT_NORMAL;
 
@@ -786,6 +866,8 @@ std::string getReply(std::string request) {
         return splashRequest();
     else if (request == "cursorpos")
         return cursorPosRequest(format);
+    else if (request.find("output") == 0)
+        return dispatchOutput(request);
     else if (request.find("dispatch") == 0)
         return dispatchRequest(request);
     else if (request.find("keyword") == 0)

src/helpers/Monitor.cpp

@@ -8,6 +8,9 @@ void CMonitor::onConnect(bool noRule) {
 
     szName = output->name;
 
+    if (!wlr_backend_is_drm(output->backend))
+        createdByUser = true; // should be true. WL, X11 and Headless backends should be addable / removable
+
     // get monitor rule that matches
     SMonitorRule monitorRule = g_pConfigManager->getMonitorRuleFor(output->name, output->description ? output->description : "");
 

src/helpers/Monitor.hpp

@@ -40,6 +40,7 @@ public:
     bool        dpmsStatus = true;
     bool        vrrActive = false; // this can be TRUE even if VRR is not active in the case that this display does not support it.
     bool        enabled10bit = false; // as above, this can be TRUE even if 10 bit failed.
+    bool        createdByUser = false;
 
     // mirroring
     CMonitor*   pMirrorOf = nullptr;

src/helpers/XWaylandStubs.hpp

@@ -154,4 +154,8 @@ inline void wlr_xwayland_surface_close(wlr_xwayland_surface*) { }
 
 inline void wlr_xwayland_surface_set_fullscreen(wlr_xwayland_surface*, bool) { }
 
-inline void wlr_xwayland_surface_set_minimized(wlr_xwayland_surface *, bool) {}
+inline void wlr_xwayland_surface_set_minimized(wlr_xwayland_surface *, bool) { }
+
+inline bool wlr_backend_is_x11(void*) { return false; }
+
+inline void wlr_x11_output_create(void*) { }

src/includes.hpp

@@ -99,10 +99,15 @@ extern "C" {
 #include <wlr/types/wlr_text_input_v3.h>
 #include <wlr/types/wlr_touch.h>
 #include <wlr/types/wlr_switch.h>
+#include <wlr/config.h>
+#include <wlr/backend/headless.h>
+#include <wlr/backend/multi.h>
+#include <wlr/backend/wayland.h>
 
 #include <drm_fourcc.h>
 
 #ifndef NO_XWAYLAND
+#include <wlr/backend/x11.h>
 #include <wlr/xwayland.h>
 #include <X11/Xproto.h>
 #endif

src/render/Renderer.cpp

@@ -1347,6 +1347,13 @@ bool CHyprRenderer::applyMonitorRule(CMonitor* pMonitor, SMonitorRule* pMonitorR
     pMonitor->vecSize = (Vector2D(x, y) / pMonitor->scale).floor();
     pMonitor->vecTransformedSize = Vector2D(x,y);
 
+    if (pMonitor->createdByUser) {
+        wlr_box transformedBox = { 0, 0, (int)pMonitor->vecTransformedSize.x, (int)pMonitor->vecTransformedSize.y };
+        wlr_box_transform(&transformedBox, &transformedBox, wlr_output_transform_invert(pMonitor->output->transform), (int)pMonitor->vecTransformedSize.x, (int)pMonitor->vecTransformedSize.y);
+
+        pMonitor->vecPixelSize = Vector2D(transformedBox.width, transformedBox.height);
+    }
+
     if (pMonitorRule->offset == Vector2D(-1, -1) && pMonitor->vecPosition == Vector2D(-1, -1)) {
         // let's find manually a sensible position for it, to the right.
         Vector2D finalPos;