From 726bf58428f937b9ef40684f2a5f38c590ce738b Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 15 Aug 2017 19:17:40 +0200
Subject: Handle multiscreen properly, make background persistent

---
 src/x11util.cpp | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/x11util.cpp

(limited to 'src/x11util.cpp')

diff --git a/src/x11util.cpp b/src/x11util.cpp
new file mode 100644
index 0000000..f56d31e
--- /dev/null
+++ b/src/x11util.cpp
@@ -0,0 +1,62 @@
+#include "x11util.h"
+extern "C" {
+	#include <X11/Xlib.h>
+	#include <X11/Xutil.h>
+}
+#include <cstring>
+#include <cstdlib>
+#include <cstdio>
+
+static int eHandler(Display* dpy, XErrorEvent* e)
+{
+	char buf[1000];
+	XGetErrorText(dpy, e->error_code, buf, 1000);
+	fprintf(stderr, "X ERROR %d: %s\n", (int)e->error_code, buf);
+	return 0;
+}
+
+extern "C"
+void AddPixmapToBackground(unsigned const char* imgData, int width, int height, int depth, int bytesPerLine, int byteCount)
+{
+    Pixmap pix = 0;
+    GC gc = NULL;
+    XImage *xi = NULL;
+    XGCValues gc_init;
+    memset(&gc_init, 0, sizeof(gc_init));
+    Display* dpy = XOpenDisplay(NULL);
+    if (dpy == NULL)
+    	return;
+    XSetErrorHandler(&eHandler);
+    int screen = DefaultScreen(dpy);
+    Window root = RootWindow(dpy, screen);
+    char *data = (char*)malloc(byteCount);
+    memcpy(data, imgData, byteCount);
+    xi = XCreateImage(dpy, CopyFromParent, depth, ZPixmap, 0, data, width, height, 32, bytesPerLine);
+    if (xi == NULL)
+    	goto cleanup;
+    pix = XCreatePixmap(dpy, root, width, height, (unsigned int)DefaultDepth(dpy, screen));
+    if (pix == 0)
+    	goto cleanup;
+    gc_init.foreground = BlackPixel(dpy, screen);
+	gc_init.background = WhitePixel(dpy, screen);
+	gc = XCreateGC(dpy, pix, GCForeground|GCBackground, &gc_init);
+	if (gc == NULL)
+	    goto cleanup;
+	int res1, res2, res3;
+	res1 = XPutImage(dpy, pix, gc, xi, 0, 0, 0, 0, width, height);
+   	res2 = XSetWindowBackgroundPixmap(dpy, root, pix);
+    res3 = XClearWindow(dpy, root);
+cleanup:
+	if (gc != NULL) {
+		XFreeGC(dpy, gc);
+	}
+	if (pix != 0) {
+		XFreePixmap(dpy, pix);
+	}
+	if (xi != NULL) {
+		XDestroyImage(xi);
+	}
+    if (dpy != NULL) {
+    	XCloseDisplay(dpy);
+    }
+}
-- 
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