1 files changed, 66 insertions, 0 deletions
diff --git a/chrome/common/io_surface_support_mac.h b/chrome/common/io_surface_support_mac.h
new file mode 100644
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+++ b/chrome/common/io_surface_support_mac.h
@@ -0,0 +1,66 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_COMMON_IO_SURFACE_SUPPORT_MAC_H_
+#define CHROME_COMMON_IO_SURFACE_SUPPORT_MAC_H_
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <mach/mach.h>
+#include <OpenGL/OpenGL.h>
+
+#include "base/basictypes.h"
+
+// This Mac OS X-specific class provides dynamically-linked access to
+// IOSurface.framework, which is only available on 10.6 and later.
+// Since Chromium is built on 10.5 we must dynamically look up all of
+// the entry points we need in this framework.
+
+// See IOSurface/IOSurfaceAPI.h and OpenGL/CGLIOSurface.h on 10.6 for
+// documentation of the fields and methods of this class.
+
+class IOSurfaceSupport {
+ public:
+  // Returns an instance of the IOSurfaceSupport class if the
+  // operating system supports it, NULL otherwise. It is safe to call
+  // this multiple times.
+  static IOSurfaceSupport* Initialize();
+
+  virtual CFStringRef GetKIOSurfaceWidth() = 0;
+  virtual CFStringRef GetKIOSurfaceHeight() = 0;
+  virtual CFStringRef GetKIOSurfaceBytesPerElement() = 0;
+  virtual CFStringRef GetKIOSurfaceIsGlobal() = 0;
+
+  virtual CFTypeRef IOSurfaceCreate(CFDictionaryRef properties) = 0;
+
+  // The following two APIs assume the IOSurface was created with the
+  // kIOSurfaceIsGlobal key set to true
+  virtual uint32 IOSurfaceGetID(CFTypeRef io_surface) = 0;
+  virtual CFTypeRef IOSurfaceLookup(uint32 io_surface_id) = 0;
+
+  // The following two APIs are more robust and secure, but
+  // unfortunately it looks like it will be a lot of work to correctly
+  // transmit a mach port from process to process (possibly requiring
+  // a side channel for or extension of the Chrome IPC mechanism)
+  virtual mach_port_t IOSurfaceCreateMachPort(CFTypeRef io_surface) = 0;
+  virtual CFTypeRef IOSurfaceLookupFromMachPort(mach_port_t port) = 0;
+
+  virtual CGLError CGLTexImageIOSurface2D(CGLContextObj ctx,
+                                          GLenum target,
+                                          GLenum internal_format,
+                                          GLsizei width,
+                                          GLsizei height,
+                                          GLenum format,
+                                          GLenum type,
+                                          CFTypeRef io_surface,
+                                          GLuint plane) = 0;
+
+ protected:
+  IOSurfaceSupport();
+  virtual ~IOSurfaceSupport();
+
+  DISALLOW_COPY_AND_ASSIGN(IOSurfaceSupport);
+};
+
+#endif  // CHROME_COMMON_IO_SURFACE_SUPPORT_MAC_H_
+