types/output: use request_swapchain signal to create swapchain

types/wlr_output.c

@@ -10,7 +10,6 @@
 #include <wlr/render/interface.h>
 #include <wlr/render/wlr_renderer.h>
 #include <wlr/types/wlr_matrix.h>
-#include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_seat.h>
 #include <wlr/types/wlr_surface.h>
 #include <wlr/util/box.h>
@@ -21,6 +20,7 @@
 #include "render/drm_format_set.h"
 #include "render/swapchain.h"
 #include "render/wlr_renderer.h"
+#include "types/wlr_output.h"
 #include "util/global.h"
 #include "util/signal.h"
 
@@ -499,45 +499,26 @@ static bool output_create_swapchain(struct wlr_output *output,
 		return true;
 	}
 
-	struct wlr_allocator *allocator = backend_get_allocator(output->backend);
-	if (allocator == NULL) {
-		wlr_log(WLR_ERROR, "Failed to get backend allocator");
-		return false;
-	}
+	wlr_log(WLR_DEBUG, "output '%s' requesting swapchain of size %dx%d",
+			output->name, width, height);
 
-	const struct wlr_drm_format_set *display_formats = NULL;
-	if (output->impl->get_primary_formats) {
-		display_formats =
-			output->impl->get_primary_formats(output, allocator->buffer_caps);
-		if (display_formats == NULL) {
-			wlr_log(WLR_ERROR, "Failed to get primary display formats");
-			return false;
-		}
-	}
-
-	struct wlr_drm_format *format = output_pick_format(output, display_formats);
-	if (format == NULL) {
-		wlr_log(WLR_ERROR, "Failed to pick primary buffer format for output '%s'",
-			output->name);
-		return false;
-	}
-	wlr_log(WLR_DEBUG, "Choosing primary buffer format 0x%"PRIX32" for output '%s'",
-		format->format, output->name);
+	struct wlr_output_swapchain_request request = {
+		.output = output,
+		.width = width,
+		.height = height,
+		.allow_modifiers = allow_modifiers,
+		.swapchain = NULL,
+	};
 
-	if (!allow_modifiers && (format->len != 1 || format->modifiers[0] != DRM_FORMAT_MOD_LINEAR)) {
-		format->len = 0;
-	}
+	wlr_signal_emit_safe(&output->events.request_swapchain, &request);
 
-	struct wlr_swapchain *swapchain =
-		wlr_swapchain_create(allocator, width, height, format);
-	free(format);
-	if (swapchain == NULL) {
+	if (request.swapchain == NULL) {
 		wlr_log(WLR_ERROR, "Failed to create output swapchain");
 		return false;
 	}
 
 	wlr_swapchain_destroy(output->swapchain);
-	output->swapchain = swapchain;
+	output->swapchain = request.swapchain;
 
 	return true;
 }