- Added Cairo-based window snapshot conversion (with unpremultiplication) for drag icons and updated drag rendering to use the new helper instead of drawable capture.

- Updated GtkXText to track the draw window and use a pixmap-to-surface helper for Cairo contexts, avoiding drawable references in the struct and rendering flow.
- Added a Cairo helper for capturing window-backed surfaces and used it when blitting during scrolling, fixing the build break from the removed drawable helper.

src/fe-gtk/maingui.c

@@ -91,6 +91,88 @@ mg_set_source_color (cairo_t *cr, const GdkColor *color)
 		color->blue / 65535.0, 1.0);
 }
 
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+#define MG_CAIRO_BLUE 0
+#define MG_CAIRO_GREEN 1
+#define MG_CAIRO_RED 2
+#define MG_CAIRO_ALPHA 3
+#else
+#define MG_CAIRO_ALPHA 0
+#define MG_CAIRO_RED 1
+#define MG_CAIRO_GREEN 2
+#define MG_CAIRO_BLUE 3
+#endif
+
+static inline void
+mg_unpremultiply_pixel (const guchar *src, guchar *dest)
+{
+	guchar alpha = src[MG_CAIRO_ALPHA];
+	guchar red = src[MG_CAIRO_RED];
+	guchar green = src[MG_CAIRO_GREEN];
+	guchar blue = src[MG_CAIRO_BLUE];
+
+	if (alpha == 0)
+	{
+		dest[0] = 0;
+		dest[1] = 0;
+		dest[2] = 0;
+		dest[3] = 0;
+		return;
+	}
+
+	dest[0] = (guchar)((red * 255 + alpha / 2) / alpha);
+	dest[1] = (guchar)((green * 255 + alpha / 2) / alpha);
+	dest[2] = (guchar)((blue * 255 + alpha / 2) / alpha);
+	dest[3] = alpha;
+}
+
+static GdkPixbuf *
+mg_pixbuf_from_window (GdkWindow *window, int width, int height)
+{
+	cairo_surface_t *surface;
+	cairo_t *cr;
+	GdkPixbuf *pixbuf;
+	guchar *surface_data;
+	guchar *dest;
+	int surface_stride;
+	int dest_stride;
+	int x;
+	int y;
+
+	surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
+	cr = cairo_create (surface);
+	gdk_cairo_set_source_window (cr, window, 0.0, 0.0);
+	cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+	cairo_paint (cr);
+	cairo_destroy (cr);
+
+	cairo_surface_flush (surface);
+
+	pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
+	surface_data = cairo_image_surface_get_data (surface);
+	surface_stride = cairo_image_surface_get_stride (surface);
+	dest = gdk_pixbuf_get_pixels (pixbuf);
+	dest_stride = gdk_pixbuf_get_rowstride (pixbuf);
+
+	for (y = 0; y < height; y++)
+	{
+		const guchar *src_row = surface_data + (y * surface_stride);
+		guchar *dest_row = dest + (y * dest_stride);
+
+		for (x = 0; x < width; x++)
+		{
+			const guchar *src = src_row + (x * 4);
+			guchar *dst = dest_row + (x * 4);
+
+			mg_unpremultiply_pixel (src, dst);
+		}
+	}
+
+	cairo_surface_destroy (surface);
+
+	return pixbuf;
+}
+
 static void mg_create_entry (session *sess, GtkWidget *box);
 static void mg_create_search (session *sess, GtkWidget *box);
 #ifdef G_OS_WIN32
@@ -4062,18 +4144,18 @@ gboolean
 mg_drag_begin_cb (GtkWidget *widget, GdkDragContext *context, gpointer userdata)
 {
         int width, height;
-        GdkColormap *cmap;
         GdkPixbuf *pix, *pix2;
+        GdkWindow *window;
 
         /* ignore file drops */
         if (!mg_is_gui_target (context))
                 return FALSE;
 
-        cmap = gtk_widget_get_colormap (widget);
-        width = gdk_window_get_width (gtk_widget_get_window (widget));
-        height = gdk_window_get_height (gtk_widget_get_window (widget));
+        window = gtk_widget_get_window (widget);
+        width = gdk_window_get_width (window);
+        height = gdk_window_get_height (window);
 
-        pix = gdk_pixbuf_get_from_drawable (NULL, gtk_widget_get_window (widget), cmap, 0, 0, 0, 0, width, height);
+        pix = mg_pixbuf_from_window (window, width, height);
         pix2 = gdk_pixbuf_scale_simple (pix, width * 4 / 5, height / 2, GDK_INTERP_HYPER);
         g_object_unref (pix);
 
@@ -4128,7 +4210,7 @@ mg_drag_motion_cb (GtkWidget *widget, GdkDragContext *context, int x, int y, gui
         cairo_t *cr;
         int half, width, height;
         int ox, oy;
-        GdkDrawable *draw;
+        GdkWindow *window;
         GtkAllocation allocation;
 
         /* ignore file drops */
@@ -4142,20 +4224,20 @@ mg_drag_motion_cb (GtkWidget *widget, GdkDragContext *context, int x, int y, gui
                 oy = allocation.y;
                 width = allocation.width;
                 height = allocation.height;
-                draw = gtk_widget_get_window (widget);
+                window = gtk_widget_get_window (widget);
         }
         else
         {
                 ox = oy = 0;
-                width = gdk_window_get_width (gtk_widget_get_window (widget));
-                height = gdk_window_get_height (gtk_widget_get_window (widget));
-                draw = gtk_widget_get_window (widget);
+                window = gtk_widget_get_window (widget);
+                width = gdk_window_get_width (window);
+                height = gdk_window_get_height (window);
         }
 
         col.red = rand() % 0xffff;
         col.green = rand() % 0xffff;
         col.blue = rand() % 0xffff;
-        cr = gdk_cairo_create (draw);
+        cr = gdk_cairo_create (window);
         cairo_set_operator (cr, CAIRO_OPERATOR_XOR);
         mg_set_source_color (cr, &col);
         cairo_set_line_width (cr, 1.0);