Implement Pango RenderText for Linux.

ui/gfx/gtk_util.h

 // Copyright (c) 2011 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 UI_GFX_GTK_UTIL_H_
 #define UI_GFX_GTK_UTIL_H_
 #pragma once
 
 #include <glib-object.h>
+#include <pango/pango-layout.h>
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
+#include "base/i18n/rtl.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/ui_export.h"
 
 typedef struct _GdkPixbuf GdkPixbuf;
 typedef struct _GdkRegion GdkRegion;
 typedef struct _GdkCursor GdkCursor;
 
 typedef struct _PangoContext PangoContext;
 
 class CommandLine;
@@ skipping 34 matching lines @@
     const std::string& label);
 
 // Removes the "&" accelerators from a Windows label.
 UI_EXPORT std::string RemoveWindowsStyleAccelerators(const std::string& label);
 
 // Makes a copy of |pixels| with the ordering changed from BGRA to RGBA.
 // The caller is responsible for free()ing the data. If |stride| is 0, it's
 // assumed to be 4 * |width|.
 uint8_t* BGRAToRGBA(const uint8_t* pixels, int width, int height, int stride);
 
+class Font;
+void SetupPangoLayout(PangoLayout* layout,

[msw, 2011/08/19 23:16:59]

Maybe move this up with GetPangoContext and GetPangoResolution, move the
definition alongside their definitions too.

[xji, 2011/08/22 23:57:28]

done.
but the definition depends on skia_util.h and canvas.h, which I am not sure
whether gtk_util should depend on.

[msw, 2011/08/23 08:01:01]

Yeah, I don't think it should either... let's consult with an OWNER.

+                      const string16& text,
+                      const gfx::Font& font,
+                      int width,
+                      base::i18n::TextDirection text_direction,
+                      int flags);
 }  // namespace gfx
 
 // It's not legal C++ to have a templatized typedefs, so we wrap it in a
 // struct.  When using this, you need to include ::Type.  E.g.,
 // ScopedGObject<GdkPixbufLoader>::Type loader(gdk_pixbuf_loader_new());
 template<class T>
 struct ScopedGObject {
   // A helper class that will g_object_unref |p| when it goes out of scope.
   // This never adds a ref, it only unrefs.
   template<class U>
   struct GObjectUnrefer {
     void operator()(U* ptr) const {
       if (ptr)
         g_object_unref(ptr);
     }
   };
 
   typedef scoped_ptr_malloc<T, GObjectUnrefer<T> > Type;
 };
 
 #endif  // UI_GFX_GTK_UTIL_H_