Allow program to work without the Realtime Blur extension files

objects/obj_popup/Draw_0.gml

@@ -3,7 +3,7 @@ theme = obj_controller.theme
 if (!mouse_rectangle(x1, y1, w, h)) {global.popup = 0 instance_destroy()}
 if (alarm[0] > -1) exit
 if (alpha < 1) alpha += 0.25 * (30 / (room_speed * obj_controller.currspeed)) * (1 + (theme != 3))
-if (theme = 3 && obj_controller.acrylic) draw_surface_blur(application_surface, x, y, maxw + 16, 20 + 18 * (!singleline), 0.5)
+if (theme = 3 && obj_controller.acrylic) draw_surface_blur_alt(application_surface, x, y, maxw + 16, 20 + 18 * (!singleline), 0.5)
 if (theme != 3) {
 if (singleline) {
     draw_sprite_ext(spr_tooltip_sl_left, theme, x, y, 1, 1, 0, -1, alpha)

scripts/blur_scripts_alt/blur_scripts_alt.gml

@@ -0,0 +1,43 @@
+/*
+* Provided as a replacement to blur_scripts.gml, which belongs to
+* the Realtime Blur extension by Foxy Of Jungle:
+* https://marketplace.yoyogames.com/assets/9540/blur-realtime-performance
+* 
+* Since it's a paid extension, the source code cannot be published
+* to the repository, so the extension files must be added manually
+* to the project folder after cloning.
+* 
+* Note Block Studio will work just fine without the extension, but
+* the transparency effects for the Fluent theme will be missing the
+* blur effect.
+*/
+
+function sprite_create_blur_alt(sprite, downamount, width, height, blurradius, quality, directions) {
+	// Returns a sprite index
+	try {
+		return sprite_create_blur(sprite, downamount, width, height, blurradius, quality, directions);
+	} catch (exc) {
+		var surf = surface_create(width, height);
+		surface_set_target(surf);
+		draw_sprite_stretched(sprite, 0, 0, 0, width, height);
+		surface_reset_target();
+		var spr = sprite_create_from_surface(surf, 0, 0, width, height, 0, 0, 0, 0);
+		surface_free(surf);
+		return spr;
+	}
+}
+
+function draw_surface_blur_alt(surface, x, y, w, h, downamount) {
+	try {
+		draw_surface_blur(surface, x, y, w, h, downamount);
+	} catch (exc) {
+		var surf = surface_create(w, h);
+		surface_set_target(surf);
+		draw_surface_part(surf, x, y, w, h, 0, 0);
+		surface_reset_target();
+		surface_free(surf);
+	}
+}
+
+// NB: wave, sprite_blur_clear and sprite_draw_blur were suppressed
+// from this script as they aren't currently used.

scripts/control_create/control_create.gml

@@ -55,7 +55,7 @@ function control_create() {
 	if (wpaperexist) {
 		wpaper = sprite_add(data_directory + "Wallpaper.jpg", 1, 0, 0, 0, 0)
 		if (display_width / display_height < sprite_get_width(wpaper) / sprite_get_height(wpaper)) wpaperside = 1
-		wpaperblur = sprite_create_blur(wpaper, 0.25, sprite_get_width(wpaper), sprite_get_height(wpaper), 300, 8, 16)
+		wpaperblur = sprite_create_blur_alt(wpaper, 0.25, sprite_get_width(wpaper), sprite_get_height(wpaper), 300, 8, 16)
 	}
 
 	// Audio

scripts/draw_msg/draw_msg.gml

@@ -9,7 +9,7 @@ function draw_msg(){
 	y1 = msgy
 	y2 = msgy - 20
 	draw_set_color(7368816)
-	if (theme = 3 && msgalpha >= 0.5 && acrylic) draw_surface_blur(application_surface, x1 - 10, y1 - 30, x2 - x1 + 20, 40, 0.5)
+	if (theme = 3 && msgalpha >= 0.5 && acrylic) draw_surface_blur_alt(application_surface, x1 - 10, y1 - 30, x2 - x1 + 20, 40, 0.5)
 	if (theme = 3) draw_roundrect(x1 - 10, y1 + 10, x2 + 10, y2 - 10, 1)
 	draw_set_color(15790320)
 	if (theme = 1) draw_set_color(13160660)

scripts/menu_draw/menu_draw.gml

@@ -35,7 +35,7 @@ function menu_draw() {
 			draw_sprite_ext(spr_shadowext, 3 + 5 * (obj_controller.fdark && theme = 3), dx + menu_wid[m] + 1, dy + 9, 1, hei - 7, 0, -1, 1)
 			draw_sprite(spr_shadowext, 4 + 5 * (obj_controller.fdark && theme = 3), dx + menu_wid[m] + 1, dy + 4)
 		}
-		if (theme = 3 && o.acrylic) draw_surface_blur(application_surface, dx, dy, menu_wid[m] + 1, hei + 1, 0.5)
+		if (theme = 3 && o.acrylic) draw_surface_blur_alt(application_surface, dx, dy, menu_wid[m] + 1, hei + 1, 0.5)
 		if (theme = 3 && o.acrylic) draw_set_alpha(0.6)
 		if (theme = 3 && o.acrylic) draw_acrylic_texture(dx, dy, menu_wid[m] + 1, hei + 1)
 	    if (theme != 3) draw_rectangle(dx, dy, dx + menu_wid[m], dy + hei, 0)