Ozone GBM: support R_8 format to GpuMemoryBuffers

ui/ozone/platform/drm/common/drm_util.cc

Index: ui/ozone/platform/drm/common/drm_util.cc
diff --git a/ui/ozone/platform/drm/common/drm_util.cc b/ui/ozone/platform/drm/common/drm_util.cc
index 586571a1972405c38b15215468781269d3fe0d87..48885043deb9020ee6a6803eb66195555133bd2b 100644
--- a/ui/ozone/platform/drm/common/drm_util.cc
+++ b/ui/ozone/platform/drm/common/drm_util.cc
@@ -17,6 +17,9 @@
 #define DRM_MODE_CONNECTOR_DSI 16
 #endif
 
+// TODO(dshwang): after most linux and libdrm has this definition, remove it.
+#define DRM_FORMAT_R8 fourcc_code('R', '8', ' ', ' ')

[dnicoara, 2016/04/07 15:57:16]

Surround it with #if-defs to avoid warnings when it is added to libdrm.

[dshwang, 2016/04/07 17:35:55]

Done. guard by #ifndef DRM_FORMAT_R8

+
 namespace ui {
 
 namespace {
@@ -291,6 +294,8 @@ DisplaySnapshot_Params CreateDisplaySnapshotParams(
 
 int GetFourCCFormatFromBufferFormat(gfx::BufferFormat format) {
   switch (format) {
+    case gfx::BufferFormat::R_8:
+      return DRM_FORMAT_R8;
     case gfx::BufferFormat::RGBA_8888:
       return DRM_FORMAT_ABGR8888;
     case gfx::BufferFormat::RGBX_8888:
@@ -309,6 +314,8 @@ int GetFourCCFormatFromBufferFormat(gfx::BufferFormat format) {
 
 gfx::BufferFormat GetBufferFormatFromFourCCFormat(int format) {
   switch (format) {
+    case DRM_FORMAT_R8:
+      return gfx::BufferFormat::R_8;
     case DRM_FORMAT_ABGR8888:
       return gfx::BufferFormat::RGBA_8888;
     case DRM_FORMAT_XBGR8888: