diff --git a/tests/util/pattern.c b/tests/util/pattern.c
index f1c844ea..34d9d3e4 100644
--- a/tests/util/pattern.c
+++ b/tests/util/pattern.c
@@ -79,10 +79,12 @@ static inline uint32_t swap32(uint32_t x)
 #define cpu_to_be16(x)			(x)
 #define cpu_to_le16(x)			swap16(x)
 #define cpu_to_le32(x)			swap32(x)
+#define fb_foreign_endian(format)	(!((format) & DRM_FORMAT_BIG_ENDIAN))
 #else
 #define cpu_to_be16(x)			swap16(x)
 #define cpu_to_le16(x)			(x)
 #define cpu_to_le32(x)			(x)
+#define fb_foreign_endian(format)	((format) & DRM_FORMAT_BIG_ENDIAN)
 #endif
 
 #define cpu_to_fb16(x)	(fb_be ? cpu_to_be16(x) : cpu_to_le16(x))
@@ -1290,6 +1292,32 @@ static void fill_smpte(const struct util_format_info *info, void *planes[3],
 	}
 }
 
+#if HAVE_CAIRO
+static void byteswap_buffer16(void *mem, unsigned int width, unsigned int height,
+			      unsigned int stride)
+{
+	unsigned int x, y;
+
+	for (y = 0; y < height; ++y) {
+		for (x = 0; x < width; ++x)
+			((uint16_t *)mem)[x] = swap16(((uint16_t *)mem)[x]);
+		mem += stride;
+	}
+}
+
+static void byteswap_buffer32(void *mem, unsigned int width, unsigned int height,
+			      unsigned int stride)
+{
+	unsigned int x, y;
+
+	for (y = 0; y < height; ++y) {
+		for (x = 0; x < width; ++x)
+			((uint32_t *)mem)[x] = swap32(((uint32_t *)mem)[x]);
+		mem += stride;
+	}
+}
+#endif
+
 static void make_pwetty(void *data, unsigned int width, unsigned int height,
 			unsigned int stride, uint32_t format)
 {
@@ -1297,6 +1325,8 @@ static void make_pwetty(void *data, unsigned int width, unsigned int height,
 	cairo_surface_t *surface;
 	cairo_t *cr;
 	cairo_format_t cairo_format;
+	bool swap16 = false;
+	bool swap32 = false;
 
 	/* we can ignore the order of R,G,B channels */
 	switch (format) {
@@ -1309,6 +1339,7 @@ static void make_pwetty(void *data, unsigned int width, unsigned int height,
 	case DRM_FORMAT_RGB565:
 	case DRM_FORMAT_BGR565:
 		cairo_format = CAIRO_FORMAT_RGB16_565;
+		swap16 = fb_foreign_endian(format);
 		break;
 #if CAIRO_VERSION_MAJOR > 1 || (CAIRO_VERSION_MAJOR == 1 && CAIRO_VERSION_MINOR >= 12)
 	case DRM_FORMAT_ARGB2101010:
@@ -1316,12 +1347,19 @@ static void make_pwetty(void *data, unsigned int width, unsigned int height,
 	case DRM_FORMAT_ABGR2101010:
 	case DRM_FORMAT_XBGR2101010:
 		cairo_format = CAIRO_FORMAT_RGB30;
+		swap32 = fb_foreign_endian(format);
 		break;
 #endif
 	default:
 		return;
 	}
 
+	/* Cairo uses native byte order, so we may have to byteswap before... */
+	if (swap16)
+		byteswap_buffer16(data, width, height, stride);
+	if (swap32)
+		byteswap_buffer32(data, width, height, stride);
+
 	surface = cairo_image_surface_create_for_data(data,
 						      cairo_format,
 						      width, height,
@@ -1357,6 +1395,12 @@ static void make_pwetty(void *data, unsigned int width, unsigned int height,
 		}
 
 	cairo_destroy(cr);
+
+	/* ... and after */
+	if (swap16)
+		byteswap_buffer16(data, width, height, stride);
+	if (swap32)
+		byteswap_buffer32(data, width, height, stride);
 #endif
 }