Render saved buffers with the surface's dimensions

include/sway/desktop/transaction.h

@@ -52,11 +52,16 @@ void transaction_notify_view_ready_by_size(struct sway_view *view,
 		int width, int height);
 
 /**
- * Get the texture that should be rendered for a view.
+ * Get the saved texture that should be rendered for a view.
  *
- * In most cases this will return the normal live texture for a view, but if the
- * view is in a transaction then it'll return a saved texture.
+ * The addresses pointed at by the width and height pointers will be populated
+ * with the surface's dimensions, which may be different to the texture's
+ * dimensions if output scaling is used.
+ *
+ * This function should only be called if it is known that the view has
+ * instructions.
  */
-struct wlr_texture *transaction_get_texture(struct sway_view *view);
+struct wlr_texture *transaction_get_saved_texture(struct sway_view *view,
+		int *width, int *height);
 
 #endif

sway/desktop/output.c

@@ -354,15 +354,17 @@ static void render_saved_view(struct sway_view *view,
 		struct sway_output *output, pixman_region32_t *damage, float alpha) {
 	struct wlr_output *wlr_output = output->wlr_output;
 
-	struct wlr_texture *texture = transaction_get_texture(view);
+	int width, height;
+	struct wlr_texture *texture =
+		transaction_get_saved_texture(view, &width, &height);
 	if (!texture) {
 		return;
 	}
 	struct wlr_box box = {
 		.x = view->swayc->current.view_x - output->swayc->current.swayc_x,
 		.y = view->swayc->current.view_y - output->swayc->current.swayc_y,
-		.width = view->swayc->current.view_width,
-		.height = view->swayc->current.view_height,
+		.width = width,
+		.height = height,
 	};
 
 	struct wlr_box output_box = {

sway/desktop/transaction.c

@@ -41,6 +41,7 @@ struct sway_transaction_instruction {
 	struct sway_container *container;
 	struct sway_container_state state;
 	struct wlr_buffer *saved_buffer;
+	int saved_buffer_width, saved_buffer_height;
 	uint32_t serial;
 	bool ready;
 };
@@ -71,6 +72,8 @@ static void save_view_buffer(struct sway_view *view,
 	}
 	if (view->surface && wlr_surface_has_buffer(view->surface)) {
 		instruction->saved_buffer = wlr_buffer_ref(view->surface->buffer);
+		instruction->saved_buffer_width = view->surface->current->width;
+		instruction->saved_buffer_height = view->surface->current->height;
 	}
 }
 
@@ -392,12 +395,14 @@ void transaction_notify_view_ready_by_size(struct sway_view *view,
 	}
 }
 
-struct wlr_texture *transaction_get_texture(struct sway_view *view) {
-	if (!view->swayc || !view->swayc->instructions->length) {
-		return view->surface->buffer->texture;
-	}
+struct wlr_texture *transaction_get_saved_texture(struct sway_view *view,
+		int *width, int *height) {
 	struct sway_transaction_instruction *instruction =
 		view->swayc->instructions->items[0];
-	return instruction->saved_buffer ?
-		instruction->saved_buffer->texture : NULL;
+	if (!instruction->saved_buffer) {
+		return NULL;
+	}
+	*width = instruction->saved_buffer_width;
+	*height = instruction->saved_buffer_height;
+	return instruction->saved_buffer->texture;
 }