From 39f9bf67a2637069cce3ffe56cb6d92c52c1191f Mon Sep 17 00:00:00 2001
From: Nicole Faerber <nicole.faerber@dpin.de>
Date: Fri, 15 Jan 2021 19:49:37 +0100
Subject: [PATCH] Add GTK+ skeleton playground

---
 flirgtk.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 flirgtk.c

diff --git a/flirgtk.c b/flirgtk.c
new file mode 100644
index 0000000..35fb60d
--- /dev/null
+++ b/flirgtk.c
@@ -0,0 +1,99 @@
+// gcc `pkg-config --cflags gtk+-3.0` -c flirgtk.c
+// gcc -o flirgtk flirgtk.o `pkg-config --libs gtk+-3.0`
+
+#include <gtk/gtk.h>
+
+static GtkWidget *window = NULL;
+static cairo_surface_t *surface = NULL;
+
+
+static gboolean
+configure_event (GtkWidget         *widget,
+                          GdkEventConfigure *event,
+                          gpointer           data)
+{
+GtkAllocation allocation;
+cairo_t *cr;
+
+    if (surface)
+        cairo_surface_destroy (surface);
+
+    gtk_widget_get_allocation (widget, &allocation);
+    surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
+                                               CAIRO_CONTENT_COLOR,
+                                               allocation.width,
+                                               allocation.height);
+    // cr = cairo_create (surface);
+
+    g_printerr("configure event %d x %d\n", allocation.width, allocation.height);
+
+    /* We've handled the configure event, no need for further processing. */
+    return TRUE;
+}
+
+#if 0
+int stride;
+unsigned char *data;
+cairo_surface_t *surface;
+
+stride = cairo_format_stride_for_width (format, width);
+data = malloc (stride * height);
+surface = cairo_image_surface_create_for_data (data, format,
+					  width, height,
+					  stride);
+#endif
+
+static gboolean
+draw_event (GtkWidget *widget,
+               cairo_t   *cr,
+               gpointer   data)
+{
+    g_printerr("draw event\n");
+
+    cairo_set_source_surface (cr, surface, 0, 0);
+    cairo_paint (cr);
+
+    return FALSE;
+}
+
+static void
+close_window (void)
+{
+    window = NULL;
+}
+
+
+GtkWidget *
+do_drawingarea ()
+{
+GtkWidget *da;
+
+    if (!window) {
+        window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+        gtk_window_set_title (GTK_WINDOW (window), "FLIR One");
+
+        g_signal_connect (window, "destroy",
+                        G_CALLBACK (close_window), NULL); 
+        da = gtk_drawing_area_new ();
+        /* set a minimum size */
+        gtk_widget_set_size_request (da, 160, 120);
+
+        gtk_container_add (GTK_CONTAINER (window), da);
+
+        g_signal_connect (da, "draw",
+                        G_CALLBACK (draw_event), NULL);
+        g_signal_connect (da,"configure-event",
+                        G_CALLBACK (configure_event), NULL);
+        gtk_widget_show_all(window);
+    }
+    return window;
+}
+
+int main(int argc, char **argv)
+{
+    gtk_init(&argc, &argv);
+    do_drawingarea();
+    gtk_main();
+
+return 0;
+}