Allow to set X11 window icon for standalones

Signed-off-by: falkTX <falktx@falktx.com>

Makefile.base.mk

@@ -601,6 +601,14 @@ ifneq ($(WINDOWS_ICON_ID),)
 BUILD_CXX_FLAGS += -DDGL_WINDOWS_ICON_ID=$(WINDOWS_ICON_ID)
 endif
 
+ifneq ($(X11_WINDOW_ICON_NAME),)
+BUILD_CXX_FLAGS += -DDGL_X11_WINDOW_ICON_NAME=$(X11_WINDOW_ICON_NAME)
+endif
+
+ifneq ($(X11_WINDOW_ICON_SIZE),)
+BUILD_CXX_FLAGS += -DDGL_X11_WINDOW_ICON_SIZE=$(X11_WINDOW_ICON_SIZE)
+endif
+
 ifeq ($(USE_GLES2),true)
 BUILD_CXX_FLAGS += -DDGL_USE_OPENGL3 -DDGL_USE_GLES -DDGL_USE_GLES2
 endif

dgl/src/pugl.cpp

@@ -120,6 +120,10 @@ END_NAMESPACE_DGL
 # include "../../distrho/extra/FileBrowserDialogImpl.cpp"
 #endif
 
+#if defined(DGL_USING_X11) && defined(DGL_X11_WINDOW_ICON_NAME)
+extern const ulong* DGL_X11_WINDOW_ICON_NAME;
+#endif
+
 #ifndef DISTRHO_OS_MAC
 START_NAMESPACE_DGL
 #endif
@@ -605,6 +609,15 @@ void puglX11SetWindowTypeAndPID(const PuglView* const view, const bool isStandal
     const Atom _nwp = XInternAtom(display, "_NET_WM_PID", False);
     XChangeProperty(display, impl->win, _nwp, XA_CARDINAL, 32, PropModeReplace, (const uchar*)&pid, 1);
 
+   #if defined(DGL_X11_WINDOW_ICON_NAME) && defined(DGL_X11_WINDOW_ICON_SIZE)
+    if (isStandalone)
+    {
+        const Atom _nwi = XInternAtom(display, "_NET_WM_ICON", False);
+        XChangeProperty(display, impl->win, _nwi, XA_CARDINAL, 32, PropModeReplace,
+                        (const uchar*)DGL_X11_WINDOW_ICON_NAME, DGL_X11_WINDOW_ICON_SIZE);
+    }
+   #endif
+
     const Atom _wt = XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);
 
     Atom _wts[2];