aura: Make 'ui' buildable without gtk.

ui/gfx/platform_font_gtk.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_PLATFORM_FONT_GTK_
-#define UI_GFX_PLATFORM_FONT_GTK_
-#pragma once
-
-#include "base/memory/scoped_ptr.h"
-#include "third_party/skia/include/core/SkRefCnt.h"
-#include "ui/gfx/platform_font.h"
-
-class SkTypeface;
-class SkPaint;
-
-namespace gfx {
-
-class UI_EXPORT PlatformFontGtk : public PlatformFont {
- public:
-  PlatformFontGtk();
-  explicit PlatformFontGtk(const Font& other);
-  explicit PlatformFontGtk(NativeFont native_font);
-  PlatformFontGtk(const string16& font_name,
-                  int font_size);
-
-  // Converts |gfx_font| to a new pango font. Free the returned font with
-  // pango_font_description_free().
-  static PangoFontDescription* PangoFontFromGfxFont(const gfx::Font& gfx_font);
-
-  // Resets and reloads the cached system font used by the default constructor.
-  // This function is useful when the system font has changed, for example, when
-  // the locale has changed.
-  static void ReloadDefaultFont();
-
-  // Position as an offset from the height of the drawn text, used to draw
-  // an underline. This is a negative number, so the underline would be
-  // drawn at y + height + underline_position;
-  double underline_position() const;
-  // The thickness to draw the underline.
-  double underline_thickness() const;
-
-  // Overridden from PlatformFont:
-  virtual Font DeriveFont(int size_delta, int style) const;
-  virtual int GetHeight() const;
-  virtual int GetBaseline() const;
-  virtual int GetAverageCharacterWidth() const;
-  virtual int GetStringWidth(const string16& text) const;
-  virtual int GetExpectedTextWidth(int length) const;
-  virtual int GetStyle() const;
-  virtual string16 GetFontName() const;
-  virtual int GetFontSize() const;
-  virtual NativeFont GetNativeFont() const;
-
- private:
-  // Create a new instance of this object with the specified properties. Called
-  // from DeriveFont.
-  PlatformFontGtk(SkTypeface* typeface,
-                  const string16& name,
-                  int size,
-                  int style);
-  virtual ~PlatformFontGtk();
-
-  // Initialize this object.
-  void InitWithNameAndSize(const string16& font_name, int font_size);
-  void InitWithTypefaceNameSizeAndStyle(SkTypeface* typeface,
-                                        const string16& name,
-                                        int size,
-                                        int style);
-  void InitFromPlatformFont(const PlatformFontGtk* other);
-
-  // Potentially slow call to get pango metrics (average width, underline info).
-  void InitPangoMetrics();
-
-  // Setup a Skia context to use the current typeface
-  void PaintSetup(SkPaint* paint) const;
-
-  // Make |this| a copy of |other|.
-  void CopyFont(const Font& other);
-
-  // The average width of a character, initialized and cached if needed.
-  double GetAverageWidth() const;
-
-  // These two both point to the same SkTypeface. We use the SkAutoUnref to
-  // handle the reference counting, but without @typeface_ we would have to
-  // cast the SkRefCnt from @typeface_helper_ every time.
-  scoped_ptr<SkAutoUnref> typeface_helper_;
-  SkTypeface *typeface_;
-
-  // Additional information about the face
-  // Skia actually expects a family name and not a font name.
-  string16 font_family_;
-  int font_size_pixels_;
-  int style_;
-
-  // Cached metrics, generated at construction
-  int height_pixels_;
-  int ascent_pixels_;
-
-  // The pango metrics are much more expensive so we wait until we need them
-  // to compute them.
-  bool pango_metrics_inited_;
-  double average_width_pixels_;
-  double underline_position_pixels_;
-  double underline_thickness_pixels_;
-
-  // The default font, used for the default constructor.
-  static Font* default_font_;
-};
-
-}  // namespace gfx
-
-#endif  // UI_GFX_PLATFORM_FONT_GTK_