gtk3: GdkRGBA support

1 files changed, 347 insertions, 18 deletions

diff --git a/libmate-desktop/mate-bg.c b/libmate-desktop/mate-bg.c
index 83efcd3..798b3b3 100644
--- a/libmate-desktop/mate-bg.c
+++ b/libmate-desktop/mate-bg.c
@@ -101,8 +101,13 @@ struct _MateBG {
 	char		*filename;
 	MateBGPlacement	 placement;
 	MateBGColorType	 color_type;
+#if GTK_CHECK_VERSION(3, 0, 0)
+	GdkRGBA		 primary;
+	GdkRGBA		 secondary;
+#else
 	GdkColor	 primary;
 	GdkColor	 secondary;
+#endif
 	gboolean	 is_enabled;
 
 	GFileMonitor* file_monitor;
@@ -150,17 +155,31 @@ static GdkPixbuf *pixbuf_scale_to_fit  (GdkPixbuf  *src,
 static GdkPixbuf *pixbuf_scale_to_min  (GdkPixbuf  *src,
 					int         min_width,
 					int         min_height);
-
+#if !GTK_CHECK_VERSION(3, 0, 0)
 static void       pixbuf_draw_gradient (GdkPixbuf    *pixbuf,
 					gboolean      horizontal,
 					GdkColor     *c1,
 					GdkColor     *c2,
 					GdkRectangle *rect);
+#endif
 
 static void       pixbuf_tile          (GdkPixbuf  *src,
-					GdkPixbuf  *dest);
+#if GTK_CHECK_VERSION (3, 0, 0)
+					cairo_t    *cr,
+					int        width,
+					int        height
+#else
+					GdkPixbuf  *dest
+#endif
+					);
 static void       pixbuf_blend         (GdkPixbuf  *src,
+#if GTK_CHECK_VERSION (3, 0, 0)
+					cairo_t    *cr,
+					int         dest_width,
+					int         dest_height,
+#else
 					GdkPixbuf  *dest,
+#endif
 					int         src_x,
 					int         src_y,
 					int         width,
@@ -206,6 +225,20 @@ static FileSize   *find_best_size      (GSList                *sizes,
 					gint                   width,
 					gint                   height);
 
+#if GTK_CHECK_VERSION(3, 0, 0)
+static void
+color_from_string(const char *string,
+		  GdkRGBA    *colorp)
+{
+	/* If all else fails use black */
+	if (!gdk_rgba_parse (colorp, string)) {
+		colorp->red = 0.0;
+		colorp->blue = 0.0;
+		colorp->green = 0.0;
+		colorp->alpha = 1.0;
+	}
+}
+#else
 static void
 color_from_string (const char *string,
 		   GdkColor   *colorp)
@@ -218,7 +251,15 @@ color_from_string (const char *string,
 
 	gdk_color_parse (string, colorp);
 }
+#endif
 
+#if GTK_CHECK_VERSION(3, 0, 0)
+static char *
+color_to_string (const GdkRGBA *color)
+{
+	return gdk_rgba_to_string(color);
+}
+#else
 static char *
 color_to_string (const GdkColor *color)
 {
@@ -227,6 +268,7 @@ color_to_string (const GdkColor *color)
 				color->green >> 8,
 				color->blue >> 8);
 }
+#endif
 
 static gboolean
 do_changed (MateBG *bg)
@@ -360,7 +402,11 @@ mate_bg_load_from_gsettings (MateBG    *bg,
 	char    *tmp;
 	char    *filename;
 	MateBGColorType ctype;
+#if GTK_CHECK_VERSION(3, 0, 0)
+	GdkRGBA c1,c2;
+#else
 	GdkColor c1, c2;
+#endif
 	MateBGPlacement placement;
 
 	g_return_if_fail (MATE_IS_BG (bg));
@@ -420,7 +466,11 @@ mate_bg_load_from_gsettings (MateBG    *bg,
 	/* Placement */
 	placement = g_settings_get_enum (settings, MATE_BG_KEY_PICTURE_PLACEMENT);
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	mate_bg_set_rgba (bg, ctype, &c1, &c2);
+#else
 	mate_bg_set_color (bg, ctype, &c1, &c2);
+#endif
 	mate_bg_set_placement (bg, placement);
 	mate_bg_set_filename (bg, filename);
 
@@ -545,6 +595,43 @@ mate_bg_new (void)
 	return g_object_new (MATE_TYPE_BG, NULL);
 }
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+void
+mate_bg_set_rgba (MateBG *bg,
+		    MateBGColorType type,
+		    GdkRGBA *primary,
+		    GdkRGBA *secondary
+		)
+{
+	g_return_if_fail (bg != NULL);
+	g_return_if_fail (primary != NULL);
+
+	if (bg->color_type != type			||
+	    !gdk_rgba_equal (&bg->primary, primary)			||
+	    (secondary && !gdk_rgba_equal (&bg->secondary, secondary)))
+	{
+		bg->color_type = type;
+		bg->primary = *primary;
+		if (secondary) {
+			bg->secondary = *secondary;
+		}
+
+		queue_changed (bg);
+	}
+}
+
+static void
+color_to_rgba(const GdkColor* color, GdkRGBA* rgba)
+{
+	g_assert (color != NULL);
+	g_assert (rgba != NULL);
+	rgba->red = color->red/65535.0;
+	rgba->blue = color->blue/65535.0;
+	rgba->green = color->green/65535.0;
+	rgba->alpha = 1.0;
+}
+#endif
+
 void
 mate_bg_set_color (MateBG *bg,
 		    MateBGColorType type,
@@ -554,15 +641,39 @@ mate_bg_set_color (MateBG *bg,
 	g_return_if_fail (bg != NULL);
 	g_return_if_fail (primary != NULL);
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	GdkRGBA primary_rgba;
+	GdkRGBA secondary_rgba;
+
+	color_to_rgba(primary, &primary_rgba);
+
+	if(secondary) {
+		color_to_rgba(secondary, &secondary_rgba);
+	}
+#endif
+
 	if (bg->color_type != type			||
+#if GTK_CHECK_VERSION (3, 0, 0)
+	    !gdk_rgba_equal (&bg->primary, &primary_rgba)		||
+	    (secondary && !gdk_rgba_equal (&bg->secondary, &secondary_rgba)))
+#else
 	    !gdk_color_equal (&bg->primary, primary)			||
-	    (secondary && !gdk_color_equal (&bg->secondary, secondary))) {
+	    (secondary && !gdk_color_equal (&bg->secondary, secondary)))
+#endif
+	{
 
 		bg->color_type = type;
+#if GTK_CHECK_VERSION (3, 0, 0)
+		bg->primary = primary_rgba;
+		if (secondary) {
+			bg->secondary = secondary_rgba;
+		}
+#else
 		bg->primary = *primary;
 		if (secondary) {
 			bg->secondary = *secondary;
 		}
+#endif
 
 		queue_changed (bg);
 	}
@@ -589,11 +700,12 @@ mate_bg_get_placement (MateBG *bg)
 	return bg->placement;
 }
 
+#if GTK_CHECK_VERSION (3, 0, 0)
 void
-mate_bg_get_color (MateBG		*bg,
+mate_bg_get_rgba (MateBG		*bg,
 		   MateBGColorType	*type,
-		   GdkColor		*primary,
-		   GdkColor		*secondary)
+		   GdkRGBA		*primary,
+		   GdkRGBA		*secondary)
 {
 	g_return_if_fail (bg != NULL);
 
@@ -606,6 +718,31 @@ mate_bg_get_color (MateBG		*bg,
 	if (secondary)
 		*secondary = bg->secondary;
 }
+#endif
+
+void
+mate_bg_get_color (MateBG		*bg,
+		   MateBGColorType	*type,
+		   GdkColor		*primary,
+		   GdkColor		*secondary)
+{
+	g_return_if_fail (bg != NULL);
+
+	if (type)
+		*type = bg->color_type;
+
+	if (primary) {
+		primary->red = bg->primary.red * 0xffff;
+		primary->green = bg->primary.green * 0xffff;
+		primary->blue = bg->primary.blue * 0xffff;
+	}
+
+	if (secondary) {
+		secondary->red = bg->secondary.red * 0xffff;
+		secondary->green = bg->secondary.green * 0xffff;
+		secondary->blue = bg->secondary.blue * 0xffff;
+	}
+}
 
 void
 mate_bg_set_draw_background (MateBG	*bg,
@@ -817,12 +954,12 @@ mate_bg_set_filename (MateBG	 *bg,
 	}
 }
 
+#if !GTK_CHECK_VERSION(3, 0, 0)
 static void
 draw_color_area (MateBG       *bg,
 		 GdkPixbuf    *dest,
 		 GdkRectangle *rect)
 {
-	guint32 pixel;
 	GdkRectangle extent;
 
         extent.x = 0;
@@ -833,7 +970,8 @@ draw_color_area (MateBG       *bg,
 	gdk_rectangle_intersect (rect, &extent, rect);
 
 	switch (bg->color_type) {
-	case MATE_BG_COLOR_SOLID:
+	case MATE_BG_COLOR_SOLID: {
+		guint32 pixel;
 		/* not really a big deal to ignore the area of interest */
 		pixel = ((bg->primary.red >> 8) << 24)      |
 			((bg->primary.green >> 8) << 16)    |
@@ -841,6 +979,7 @@ draw_color_area (MateBG       *bg,
 			(0xff);
 
 		gdk_pixbuf_fill (dest, pixel);
+		}
 		break;
 
 	case MATE_BG_COLOR_H_GRADIENT:
@@ -855,12 +994,24 @@ draw_color_area (MateBG       *bg,
 		break;
 	}
 }
+#endif
 
 static void
 draw_color (MateBG    *bg,
-	    GdkPixbuf *dest,
-	    GdkScreen *screen)
+#if GTK_CHECK_VERSION(3, 0, 0)
+	cairo_t       *cr,
+	gint          width,
+	gint          height
+#else
+	    GdkPixbuf *dest
+#endif
+	)
 {
+#if GTK_CHECK_VERSION(3, 0, 0)
+	gdk_cairo_set_source_rgba(cr, &(bg->primary));
+	cairo_rectangle(cr, 0, 0, width, height);
+	cairo_fill(cr);
+#else
 	GdkRectangle rect;
 
 	rect.x = 0;
@@ -868,8 +1019,11 @@ draw_color (MateBG    *bg,
 	rect.width = gdk_pixbuf_get_width (dest);
 	rect.height = gdk_pixbuf_get_height (dest);
 	draw_color_area (bg, dest, &rect);
+#endif
 }
 
+
+#if !GTK_CHECK_VERSION(3, 0, 0)
 static void
 draw_color_each_monitor (MateBG    *bg,
 			 GdkPixbuf *dest,
@@ -885,6 +1039,7 @@ draw_color_each_monitor (MateBG    *bg,
 		draw_color_area (bg, dest, &rect);
 	}
 }
+#endif
 
 static GdkPixbuf *
 pixbuf_clip_to_fit (GdkPixbuf *src,
@@ -971,7 +1126,11 @@ static void
 draw_image_area (MateBG        *bg,
 		 gint           num_monitor,
 		 GdkPixbuf     *pixbuf,
+#if GTK_CHECK_VERSION (3, 0, 0)
+		 cairo_t       *cr,
+#else
 		 GdkPixbuf     *dest,
+#endif
 		 GdkRectangle  *area)
 {
 	int dest_width = area->width;
@@ -986,16 +1145,28 @@ draw_image_area (MateBG        *bg,
 
 	switch (bg->placement) {
 	case MATE_BG_PLACEMENT_TILED:
+#if GTK_CHECK_VERSION (3, 0, 0)
+		pixbuf_tile (scaled, cr, dest_width, dest_height);
+#else
 		pixbuf_tile (scaled, dest);
+#endif
 		break;
 	case MATE_BG_PLACEMENT_ZOOMED:
 	case MATE_BG_PLACEMENT_CENTERED:
 	case MATE_BG_PLACEMENT_FILL_SCREEN:
 	case MATE_BG_PLACEMENT_SCALED:
+#if GTK_CHECK_VERSION (3, 0, 0)
+		pixbuf_blend (scaled, cr, dest_width, dest_height, 0, 0, w, h, x + area->x, y + area->y, 1.0);
+#else
 		pixbuf_blend (scaled, dest, 0, 0, w, h, x + area->x, y + area->y, 1.0);
+#endif
 		break;
 	case MATE_BG_PLACEMENT_SPANNED:
+#if GTK_CHECK_VERSION (3, 0, 0)
+		pixbuf_blend (scaled, cr, dest_width, dest_height, 0, 0, w, h, x, y, 1.0);
+#else
 		pixbuf_blend (scaled, dest, 0, 0, w, h, x, y, 1.0);
+#endif
 		break;
 	default:
 		g_assert_not_reached ();
@@ -1010,22 +1181,44 @@ draw_image_area (MateBG        *bg,
 static void
 draw_image_for_thumb (MateBG     *bg,
 		      GdkPixbuf  *pixbuf,
-		      GdkPixbuf  *dest)
+#if GTK_CHECK_VERSION (3, 0, 0)
+		      cairo_t    *cr,
+		      gint       width,
+		      gint       height
+#else
+		      GdkPixbuf  *dest
+#endif
+			)
 {
 	GdkRectangle rect;
 
 	rect.x = 0;
 	rect.y = 0;
+#if GTK_CHECK_VERSION (3, 0, 0)
+	rect.width = width;
+	rect.height = height;
+
+#else
 	rect.width = gdk_pixbuf_get_width (dest);
 	rect.height = gdk_pixbuf_get_height (dest);
+#endif
 
+#if GTK_CHECK_VERSION(3, 0, 0)
+	draw_image_area (bg, -1, pixbuf, cr, &rect);
+#else
 	draw_image_area (bg, -1, pixbuf, dest, &rect);
+#endif
 }
 
 static void
 draw_once (MateBG    *bg,
+#if GTK_CHECK_VERSION (3, 0, 0)
+           cairo_t   *cr,
+           gint      width,
+           gint      height,
+#else
 	   GdkPixbuf *dest,
-	   GdkScreen *screen,
+#endif
 	   gboolean   is_root)
 {
 	GdkRectangle rect;
@@ -1037,17 +1230,27 @@ draw_once (MateBG    *bg,
 
 	rect.x = 0;
 	rect.y = 0;
+#if GTK_CHECK_VERSION (3, 0, 0)
+	rect.width = width;
+	rect.height = height;
+#else
 	rect.width = gdk_pixbuf_get_width (dest);
 	rect.height = gdk_pixbuf_get_height (dest);
+#endif
 
 	pixbuf = get_pixbuf_for_size (bg, monitor, rect.width, rect.height);
 	if (pixbuf) {
+#if GTK_CHECK_VERSION (3, 0, 0)
+		draw_image_area (bg, monitor, pixbuf, cr, &rect);
+#else
 		draw_image_area (bg, monitor, pixbuf, dest, &rect);
+#endif
 
 		g_object_unref (pixbuf);
 	}
 }
 
+#if !GTK_CHECK_VERSION (3, 0, 0)
 static void
 draw_each_monitor (MateBG    *bg,
 		   GdkPixbuf *dest,
@@ -1070,25 +1273,48 @@ draw_each_monitor (MateBG    *bg,
 		}
 	}
 }
+#endif
 
 void
 mate_bg_draw (MateBG     *bg,
+#if GTK_CHECK_VERSION(3, 0, 0)
+		cairo_t  *cr,
+		gint     width,
+		gint     height,
+#else
 	       GdkPixbuf *dest,
 	       GdkScreen *screen,
+#endif
 	       gboolean   is_root)
 {
 	if (!bg)
 		return;
 
 	if (is_root && (bg->placement != MATE_BG_PLACEMENT_SPANNED)) {
+#if GTK_CHECK_VERSION(3, 0, 0)
+		draw_color (bg, cr, width, height);
+#else
 		draw_color_each_monitor (bg, dest, screen);
+#endif
 		if (bg->filename) {
+#if GTK_CHECK_VERSION (3, 0, 0)
+			draw_once (bg, cr, width, height, is_root);
+#else
 			draw_each_monitor (bg, dest, screen);
+#endif
 		}
 	} else {
-		draw_color (bg, dest, screen);
+#if GTK_CHECK_VERSION(3, 0, 0)
+		draw_color (bg, cr, width, height);
+#else
+		draw_color (bg, dest);
+#endif
 		if (bg->filename) {
-			draw_once (bg, dest, screen, is_root);
+#if GTK_CHECK_VERSION (3, 0, 0)
+			draw_once (bg, cr, width, height, is_root);
+#else
+			draw_once (bg, dest, is_root);
+#endif
 		}
 	}
 }
@@ -1205,10 +1431,17 @@ mate_bg_create_pixmap  (MateBG      *bg,
 
 	cr = cairo_create (surface);
 	if (!bg->filename && bg->color_type == MATE_BG_COLOR_SOLID) {
+#if GTK_CHECK_VERSION(3, 0, 0)
+		gdk_cairo_set_source_rgba (cr, &(bg->primary));
+#else
 		gdk_cairo_set_source_color (cr, &(bg->primary));
+#endif
 	}
 	else
 	{
+#if GTK_CHECK_VERSION(3, 0, 0)
+		gdk_cairo_set_source_window(cr, window, 0, 0);
+#else
 		GdkPixbuf *pixbuf;
 
 		pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8,
@@ -1216,6 +1449,7 @@ mate_bg_create_pixmap  (MateBG      *bg,
 		mate_bg_draw (bg, pixbuf, gdk_window_get_screen (window), is_root);
 		gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 		g_object_unref (pixbuf);
+#endif
 	}
 
 	cairo_paint (cr);
@@ -1234,7 +1468,11 @@ mate_bg_is_dark (MateBG *bg,
 		  int      width,
 		  int      height)
 {
+#if GTK_CHECK_VERSION(3, 0, 0)
+	GdkRGBA color;
+#else
 	GdkColor color;
+#endif
 	int intensity;
 	GdkPixbuf *pixbuf;
 
@@ -1261,9 +1499,14 @@ mate_bg_is_dark (MateBG *bg,
 		g_object_unref (pixbuf);
 	}
 
+#if GTK_CHECK_VERSION(3, 0, 0)
+	// todo
+	intensity = 20;
+#else
 	intensity = (color.red * 77 +
 		     color.green * 150 +
 		     color.blue * 28) >> 16;
+#endif
 
 	return intensity < 160; /* biased slightly to be dark */
 }
@@ -1394,31 +1637,54 @@ fit_factor (int from_width, int from_height,
 	return MIN (to_width  / (double) from_width, to_height / (double) from_height);
 }
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+cairo_surface_t *
+#else
 GdkPixbuf *
+#endif
 mate_bg_create_thumbnail (MateBG               *bg,
 		           MateDesktopThumbnailFactory *factory,
 			   GdkScreen             *screen,
 			   int                    dest_width,
 			   int                    dest_height)
 {
+#if GTK_CHECK_VERSION (3, 0, 0)
+	cairo_surface_t *result;
+#else
 	GdkPixbuf *result;
+#endif
 	GdkPixbuf *thumb;
 
 	g_return_val_if_fail (bg != NULL, NULL);
 
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+	result = cairo_image_surface_create(CAIRO_FORMAT_RGB24, dest_width, dest_height);
+	cairo_t *cr = cairo_create(result);
+	draw_color (bg, cr, dest_width, dest_height);
+#else
 	result = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, dest_width, dest_height);
 
-	draw_color (bg, result, screen);
+	draw_color (bg, result);
+#endif
 
 	if (bg->filename) {
 		thumb = create_img_thumbnail (bg, factory, screen, dest_width, dest_height, -1);
 
 		if (thumb) {
+#if GTK_CHECK_VERSION (3, 0, 0)
+			draw_image_for_thumb (bg, thumb, cr, dest_width, dest_height);
+#else
 			draw_image_for_thumb (bg, thumb, result);
+#endif
 			g_object_unref (thumb);
 		}
 	}
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	cairo_destroy(cr);
+#endif
+
 	return result;
 }
 
@@ -1790,7 +2056,11 @@ blend (GdkPixbuf *p1,
        GdkPixbuf *p2,
        double alpha)
 {
+#if GTK_CHECK_VERSION (3, 0, 0)
+	cairo_surface_t *surface = gdk_cairo_surface_create_from_pixbuf(p1, 0, NULL);
+#else
 	GdkPixbuf *result = gdk_pixbuf_copy (p1);
+#endif
 	GdkPixbuf *tmp;
 
 	if (gdk_pixbuf_get_width (p2) != gdk_pixbuf_get_width (p1) ||
@@ -1804,7 +2074,18 @@ blend (GdkPixbuf *p1,
 		tmp = g_object_ref (p2);
 	}
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	cairo_t *cr = cairo_create(surface);
+	int width = gdk_pixbuf_get_width(p1);
+	int height = gdk_pixbuf_get_height(p1);
+	pixbuf_blend (tmp, cr, width, height, 0, 0, -1, -1, 0, 0, alpha);
+	cairo_destroy (cr);
+
+	GdkPixbuf *result = gdk_pixbuf_get_from_surface (surface, 0, 0, width, height);
+	cairo_surface_destroy (surface);
+#else
 	pixbuf_blend (tmp, result, 0, 0, -1, -1, 0, 0, alpha);
+#endif
 
         g_object_unref (tmp);
 
@@ -2609,6 +2890,7 @@ pixbuf_scale_to_min (GdkPixbuf *src, int min_width, int min_height)
 	return dest;
 }
 
+#if !GTK_CHECK_VERSION(3, 0, 0)
 static guchar *
 create_gradient (const GdkColor *primary,
 		 const GdkColor *secondary,
@@ -2639,14 +2921,12 @@ pixbuf_draw_gradient (GdkPixbuf    *pixbuf,
 	int height;
 	int rowstride;
 	guchar *dst;
-	guchar *dst_limit;
 	int n_channels = 3;
 
 	rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 	width = rect->width;
 	height = rect->height;
 	dst = gdk_pixbuf_get_pixels (pixbuf) + rect->x * n_channels + rowstride * rect->y;
-	dst_limit = dst + height * rowstride;
 
 	if (horizontal) {
 		guchar *gradient = create_gradient (primary, secondary, width);
@@ -2682,10 +2962,17 @@ pixbuf_draw_gradient (GdkPixbuf    *pixbuf,
 		g_free (gradient);
 	}
 }
+#endif
 
 static void
 pixbuf_blend (GdkPixbuf *src,
+#if GTK_CHECK_VERSION (3, 0, 0)
+	      cairo_t   *cr,
+	      int        dest_width,
+              int        dest_height,
+#else
 	      GdkPixbuf *dest,
+#endif
 	      int	 src_x,
 	      int	 src_y,
 	      int	 src_width,
@@ -2694,8 +2981,10 @@ pixbuf_blend (GdkPixbuf *src,
 	      int	 dest_y,
 	      double	 alpha)
 {
+#if !GTK_CHECK_VERSION (3, 0, 0)
 	int dest_width = gdk_pixbuf_get_width (dest);
 	int dest_height = gdk_pixbuf_get_height (dest);
+#endif
 	int offset_x = dest_x - src_x;
 	int offset_y = dest_y - src_y;
 
@@ -2719,29 +3008,47 @@ pixbuf_blend (GdkPixbuf *src,
 		src_height = dest_height - dest_y;
 	}
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	gdk_cairo_set_source_pixbuf(cr, src, offset_x, offset_y);
+	cairo_rectangle (cr, offset_x, offset_y, src_width, src_height);
+	cairo_paint_with_alpha (cr, alpha);
+	cairo_fill (cr);
+#else
 	gdk_pixbuf_composite (src, dest,
 			      dest_x, dest_y,
 			      src_width, src_height,
 			      offset_x, offset_y,
 			      1, 1, GDK_INTERP_NEAREST,
 			      alpha * 0xFF + 0.5);
+#endif
 }
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+pixbuf_tile (GdkPixbuf *src, cairo_t *cr, int dest_width, int dest_height)
+#else
 pixbuf_tile (GdkPixbuf *src, GdkPixbuf *dest)
+#endif
 {
 	int x, y;
 	int tile_width, tile_height;
+#if !GTK_CHECK_VERSION (3, 0, 0)
 	int dest_width = gdk_pixbuf_get_width (dest);
 	int dest_height = gdk_pixbuf_get_height (dest);
+#endif
 
 	tile_width = gdk_pixbuf_get_width (src);
 	tile_height = gdk_pixbuf_get_height (src);
 
 	for (y = 0; y < dest_height; y += tile_height) {
 		for (x = 0; x < dest_width; x += tile_width) {
+#if GTK_CHECK_VERSION (3, 0, 0)
+			pixbuf_blend (src, cr, dest_width, dest_height, 0, 0,
+				      tile_width, tile_height, x, y, 1.0);
+#else
 			pixbuf_blend (src, dest, 0, 0,
 				      tile_width, tile_height, x, y, 1.0);
+#endif
 		}
 	}
 }
@@ -3203,7 +3510,11 @@ mate_bg_changes_with_time (MateBG *bg)
  * vaguely defined as 'suitable point to show while single-stepping
  * through the slideshow'. Returns NULL if frame_num is out of bounds.
  */
+#if GTK_CHECK_VERSION (3, 0, 0)
+cairo_surface_t *
+#else
 GdkPixbuf *
+#endif
 mate_bg_create_frame_thumbnail (MateBG			*bg,
 				 MateDesktopThumbnailFactory	*factory,
 				 GdkScreen			*screen,
@@ -3212,7 +3523,11 @@ mate_bg_create_frame_thumbnail (MateBG			*bg,
 				 int				 frame_num)
 {
 	SlideShow *show;
+#if GTK_CHECK_VERSION (3, 0, 0)
+	cairo_surface_t *result;
+#else
 	GdkPixbuf *result;
+#endif
 	GdkPixbuf *thumb;
         GList *l;
         int i, skipped;
@@ -3247,10 +3562,16 @@ mate_bg_create_frame_thumbnail (MateBG			*bg,
 	if (!found)
 		return NULL;
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	result = cairo_image_surface_create(CAIRO_FORMAT_RGB24, dest_width, dest_height);
+	cairo_t *cr = cairo_create(result);
 
+	draw_color(bg, cr,  dest_width, dest_height);
+#else
 	result = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, dest_width, dest_height);
 
-	draw_color (bg, result, screen);
+	draw_color (bg, result);
+#endif
 
 	if (bg->filename) {
 		thumb = create_img_thumbnail (bg, factory, screen,
@@ -3258,11 +3579,19 @@ mate_bg_create_frame_thumbnail (MateBG			*bg,
 					      frame_num + skipped);
 
 		if (thumb) {
+#if GTK_CHECK_VERSION (3, 0, 0)
+			draw_image_for_thumb (bg, thumb, cr,  dest_width, dest_height);
+#else
 			draw_image_for_thumb (bg, thumb, result);
+#endif
 			g_object_unref (thumb);
 		}
 	}
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	cairo_destroy (cr);
+#endif
+
 	return result;
 }