[RfC PATCH 3/6] ui/pixman: add qemu_drm_format_to_pixman()

[Gerd Hoffmann]

Map drm fourcc codes to pixman formats.

Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
 include/ui/qemu-pixman.h |  1 +
 ui/qemu-pixman.c         | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/ui/qemu-pixman.h b/include/ui/qemu-pixman.h
index 4a67e01232..75661db080 100644
--- a/include/ui/qemu-pixman.h
+++ b/include/ui/qemu-pixman.h
@@ -51,6 +51,7 @@
 
 PixelFormat qemu_pixelformat_from_pixman(pixman_format_code_t format);
 pixman_format_code_t qemu_default_pixman_format(int bpp, bool native_endian);
+pixman_format_code_t qemu_drm_format_to_pixman(uint32_t drm_format);
 int qemu_pixman_get_type(int rshift, int gshift, int bshift);
 pixman_format_code_t qemu_pixman_get_format(PixelFormat *pf);
 bool qemu_pixman_check_format(DisplayChangeListener *dcl,
diff --git a/ui/qemu-pixman.c b/ui/qemu-pixman.c
index 6e591ab821..2c389ad323 100644
--- a/ui/qemu-pixman.c
+++ b/ui/qemu-pixman.c
@@ -6,6 +6,7 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "ui/console.h"
+#include "standard-headers/drm/drm_fourcc.h"
 
 PixelFormat qemu_pixelformat_from_pixman(pixman_format_code_t format)
 {
@@ -88,6 +89,25 @@ pixman_format_code_t qemu_default_pixman_format(int bpp, bool native_endian)
     return 0;
 }
 
+/* Note: drm is little endian, pixman is native endian */
+pixman_format_code_t qemu_drm_format_to_pixman(uint32_t drm_format)
+{
+    static const struct {
+        uint32_t drm_format;
+        pixman_format_code_t pixman;
+    } map[] = {
+        { DRM_FORMAT_XRGB8888, PIXMAN_LE_x8r8g8b8 }
+    };
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(map); i++) {
+        if (drm_format == map[i].drm_format) {
+            return map[i].pixman;
+        }
+    }
+    return 0;
+}
+
 int qemu_pixman_get_type(int rshift, int gshift, int bshift)
 {
     int type = PIXMAN_TYPE_OTHER;
-- 
2.9.3