ozone: Implement zero/one-copy texture for Ozone GBM.

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

Index: ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
diff --git a/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc b/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
index 34a941da3ed824f35ffc0ebaa78fb85b1cbab567..8dd6116beb02a3df2f107f1807ce4c9286e2e316 100644
--- a/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
+++ b/ui/ozone/platform/drm/common/client_native_pixmap_factory_gbm.cc
@@ -8,6 +8,11 @@
 #include "ui/gfx/native_pixmap_handle_ozone.h"
 #include "ui/ozone/public/client_native_pixmap_factory.h"
 
+#if defined(USE_VGEM_MAP)
+#include <fcntl.h>
+#include "ui/ozone/platform/drm/gpu/client_native_pixmap_vgem.h"
+#endif
+
 namespace ui {
 
 namespace {
@@ -27,7 +32,15 @@ class ClientNativePixmapGbm : public ClientNativePixmap {
 
 class ClientNativePixmapFactoryGbm : public ClientNativePixmapFactory {
  public:
-  ClientNativePixmapFactoryGbm() {}
+  ClientNativePixmapFactoryGbm() {
+#if defined(USE_VGEM_MAP)
+    // TODO(dshwang): remove ad-hoc file open. crrev.com/1248713002
+    static const char kVgemPath[] = "/dev/dri/renderD129";
+    int vgem_fd = open(kVgemPath, O_RDWR | O_CLOEXEC);
+    vgem_fd_.reset(vgem_fd);
+    DCHECK_GE(vgem_fd_.get(), 0) << "Failed to open: " << kVgemPath;
+#endif
+  }
   ~ClientNativePixmapFactoryGbm() override {}
 
   // ClientNativePixmapFactory:
@@ -37,18 +50,37 @@ class ClientNativePixmapFactoryGbm : public ClientNativePixmapFactory {
         {gfx::BufferFormat::RGBX_8888, gfx::BufferUsage::SCANOUT}};
     std::vector<Configuration> configurations(
         kConfigurations, kConfigurations + arraysize(kConfigurations));
+#if defined(USE_VGEM_MAP)
+    configurations.push_back(
+        {gfx::BufferFormat::BGRA_8888, gfx::BufferUsage::MAP});
+#endif
     return configurations;
   }
   scoped_ptr<ClientNativePixmap> ImportFromHandle(
       const gfx::NativePixmapHandle& handle,
       const gfx::Size& size,
-      gfx::BufferFormat format,
       gfx::BufferUsage usage) override {
     base::ScopedFD scoped_fd(handle.fd.fd);
+
+#if defined(USE_VGEM_MAP)
+    switch (usage) {

[reveman, 2015/08/13 15:15:58]

nit: NOTREACHED and return nullptr if |usage| is an invalid enum value.

I'd move "new ClientNativePixmapGbm" and the ifdef into the switch statement so
we can NOTREACHED() return nullptr; below it.

[dshwang, 2015/08/13 15:45:28]

Done.

+      case gfx::BufferUsage::MAP:
+        return ClientNativePixmapVgem::ImportFromDmabuf(
+            vgem_fd_.get(), scoped_fd.get(), size, handle.stride);
+      case gfx::BufferUsage::PERSISTENT_MAP:
+        NOTREACHED();
+      case gfx::BufferUsage::SCANOUT:
+        break;
+    }
+#endif
     return make_scoped_ptr<ClientNativePixmapGbm>(new ClientNativePixmapGbm);
   }
 
  private:
+#if defined(USE_VGEM_MAP)
+  base::ScopedFD vgem_fd_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapFactoryGbm);
 };