fix: gray background rect not being expanded by blur size (#295)

Author: ErikReider

sway/desktop/render.c

@@ -1592,9 +1592,6 @@ void output_render(struct fx_render_context *ctx) {
 	struct sway_output *output = ctx->output;
 	pixman_region32_t *damage = ctx->output_damage;
 
-	pixman_region32_t transformed_damage;
-	pixman_region32_init(&transformed_damage);
-
 	struct fx_effect_framebuffers *effect_fbos = ctx->pass->fx_effect_framebuffers;
 
 	struct sway_workspace *workspace = output->current.active_workspace;
@@ -1609,7 +1606,7 @@ void output_render(struct fx_render_context *ctx) {
 
 	if (!pixman_region32_not_empty(damage)) {
 		// Output isn't damaged but needs buffer swap
-		goto renderer_end;
+		return;
 	}
 
 	if (debug.damage == DAMAGE_HIGHLIGHT) {
@@ -1620,6 +1617,9 @@ void output_render(struct fx_render_context *ctx) {
 			},
 		});
 	}
+
+	pixman_region32_t transformed_damage;
+	pixman_region32_init(&transformed_damage);
 	pixman_region32_copy(&transformed_damage, damage);
 	transform_output_damage(&transformed_damage, wlr_output);
 
@@ -1715,17 +1715,9 @@ void output_render(struct fx_render_context *ctx) {
 				// copy the surrounding content where the blur would display artifacts
 				// and draw it above the artifacts
 
-				// ensure that the damage isn't expanding past the output's size
-				int32_t damage_width = damage->extents.x2 - damage->extents.x1;
-				int32_t damage_height = damage->extents.y2 - damage->extents.y1;
-				if (damage_width > output_width || damage_height > output_height) {
-					pixman_region32_intersect_rect(damage, damage,
-							0, 0, output_width, output_height);
-				} else {
-					// Expand the original damage to compensate for surrounding
-					// blurred views to avoid sharp edges between damage regions
-					wlr_region_expand(damage, damage, config_get_blur_size());
-				}
+				// Expand the original damage to compensate for surrounding
+				// blurred views to avoid sharp edges between damage regions
+				wlr_region_expand(damage, damage, config_get_blur_size());
 
 				pixman_region32_t extended_damage;
 				pixman_region32_init(&extended_damage);
@@ -1743,6 +1735,10 @@ void output_render(struct fx_render_context *ctx) {
 				pixman_region32_union(damage, damage, &extended_damage);
 				pixman_region32_fini(&extended_damage);
 
+				// Copy the new extended damage into the transformed damage
+				pixman_region32_copy(&transformed_damage, damage);
+				transform_output_damage(&transformed_damage, wlr_output);
+
 				// Capture the padding pixels before blur for later use
 				fx_renderer_read_to_buffer(ctx->pass, &effect_fbos->blur_padding_region,
 						effect_fbos->blur_saved_pixels_buffer,