GTK: Step 1 of tab strip refresh.

ui/gfx/pango_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_PANGO_UTIL_H_
 #define UI_GFX_PANGO_UTIL_H_
 #pragma once
 
+#include <cairo/cairo.h>
 #include <pango/pango.h>
+
 #include "base/i18n/rtl.h"
 #include "base/string16.h"
+#include "ui/base/ui_export.h"
+#include "third_party/skia/include/core/SkColor.h"
 
 // TODO(xji): move other pango related functions from gtk_util to here.
 
 namespace gfx {
 
 class Font;
+class PlatformFontPango;
+class Rect;
+
+// Uses Pango to draw text onto |cr|. This is the public method for d
+void UI_EXPORT DrawTextOntoCairoSurface(cairo_t* cr,
+                                        const string16& text,
+                                        const gfx::Font& font,
+                                        const gfx::Rect& bounds,
+                                        const gfx::Rect& clip,
+                                        const SkColor& text_color,
+                                        int flags);
+
+// ----------------------------------------------------------------------------
+// All other methods in this file are only to be used within the ui/ directory.
+// They are shared with internal skia interfaces.
+// ----------------------------------------------------------------------------
 
 // Setup pango layout |layout|, including set layout text as |text|, font
 // description based on |font|, width as |width| in PANGO_SCALE for RTL lcoale,
 // and set up whether auto-detect directionality, alignment, ellipsis, word
 // wrapping, resolution etc.
 void SetupPangoLayout(PangoLayout* layout,
                       const string16& text,
                       const gfx::Font& font,
                       int width,
                       base::i18n::TextDirection text_direction,
                       int flags);
+
+// Get Pango's calculated size of |layout| and modify |text_rect| within
+// |bounds|.
+void AdjustTextRectBasedOnLayout(PangoLayout* layout,
+                                 const gfx::Rect& bounds,
+                                 int flags,
+                                 gfx::Rect* text_rect);
+
+// Draws the |layout| (pango tuple of font, actual text, etc) onto |cr| using
+// |text_color| as the cairo pattern.
+void DrawPangoLayout(cairo_t* cr,
+                     PangoLayout* layout,
+                     const Font& font,
+                     const gfx::Rect& bounds,
+                     const gfx::Rect& text_rect,
+                     const SkColor& text_color,
+                     base::i18n::TextDirection text_direction,
+                     int flags);
+
+// Draw an underline under the text using |cr|, which must already be
+// initialized with the correct source. |extra_edge_width| is added to the
+// outer edge of the line.
+void DrawPangoTextUnderline(cairo_t* cr,
+                            gfx::PlatformFontPango* platform_font,
+                            double extra_edge_width,
+                            const Rect& text_rect);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_PANGO_UTIL_H_