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 de7bf0268ac9828a23c40052734b1f49b5c6546a..eda2a31acab43f00bbe4d7325c4e43629f4f50e1 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 {
@@ -17,9 +22,9 @@ class ClientNativePixmapGbm : public ClientNativePixmap {
   ClientNativePixmapGbm() {}
   ~ClientNativePixmapGbm() override {}
 
-  bool Map(void** data) override {
+  void* Map() override {
     NOTREACHED();
-    return false;
+    return nullptr;
   }
   void Unmap() override { NOTREACHED(); }
   void GetStride(int* stride) const override { NOTREACHED(); }
@@ -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 +50,42 @@ class ClientNativePixmapFactoryGbm : public ClientNativePixmapFactory {
         {gfx::BufferFormat::BGRX_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);
-    return make_scoped_ptr<ClientNativePixmapGbm>(new ClientNativePixmapGbm);
+
+    switch (usage) {
+      case gfx::BufferUsage::MAP:
+#if defined(USE_VGEM_MAP)
+        return ClientNativePixmapVgem::ImportFromDmabuf(
+            vgem_fd_.get(), scoped_fd.get(), size, handle.stride);
+#endif
+        NOTREACHED();
+        return nullptr;
+      case gfx::BufferUsage::PERSISTENT_MAP:
+        NOTREACHED();
+        return nullptr;
+      case gfx::BufferUsage::SCANOUT:
+        return make_scoped_ptr<ClientNativePixmapGbm>(
+            new ClientNativePixmapGbm);
+    }
+    NOTREACHED();
+    return nullptr;
   }
 
  private:
+#if defined(USE_VGEM_MAP)
+  base::ScopedFD vgem_fd_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapFactoryGbm);
 };