From 5d6d76c61fa6403260eacb10f0b99ff2ab919b3a Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Tue, 16 Feb 2021 19:01:33 +0100
Subject: render/shm_format: add wl_shm_format conversion helpers

---
 include/render/shm_format.h |  9 +++++++++
 render/meson.build          |  1 +
 render/shm_format.c         | 24 ++++++++++++++++++++++++
 3 files changed, 34 insertions(+)
 create mode 100644 include/render/shm_format.h
 create mode 100644 render/shm_format.c

diff --git a/include/render/shm_format.h b/include/render/shm_format.h
new file mode 100644
index 00000000..bf6c8679
--- /dev/null
+++ b/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
diff --git a/render/meson.build b/render/meson.build
index f3e1cd26..644c2e21 100644
--- a/render/meson.build
+++ b/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',
diff --git a/render/shm_format.c b/render/shm_format.c
new file mode 100644
index 00000000..cb3f7c01
--- /dev/null
+++ b/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;
+	}
+}
-- 
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