render/shm_format: add wl_shm_format conversion helpers

include/render/shm_format.h

@@ -0,0 +1,9 @@
+#ifndef RENDER_SHM_FORMAT_H
+#define RENDER_SHM_FORMAT_H
+
+#include <wayland-server-protocol.h>
+
+uint32_t convert_wl_shm_format_to_drm(enum wl_shm_format fmt);
+enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt);
+
+#endif

render/meson.build

@@ -4,6 +4,7 @@ wlr_files += files(
 	'egl.c',
 	'drm_format_set.c',
 	'gbm_allocator.c',
+	'shm_format.c',
 	'swapchain.c',
 	'wlr_renderer.c',
 	'wlr_texture.c',

render/shm_format.c

@@ -0,0 +1,24 @@
+#include <drm_fourcc.h>
+#include "render/shm_format.h"
+
+uint32_t convert_wl_shm_format_to_drm(enum wl_shm_format fmt) {
+	switch (fmt) {
+	case WL_SHM_FORMAT_XRGB8888:
+		return DRM_FORMAT_XRGB8888;
+	case WL_SHM_FORMAT_ARGB8888:
+		return DRM_FORMAT_ARGB8888;
+	default:
+		return (uint32_t)fmt;
+	}
+}
+
+enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt) {
+	switch (fmt) {
+	case DRM_FORMAT_XRGB8888:
+		return WL_SHM_FORMAT_XRGB8888;
+	case DRM_FORMAT_ARGB8888:
+		return WL_SHM_FORMAT_ARGB8888;
+	default:
+		return (enum wl_shm_format)fmt;
+	}
+}